"uuid","repository link","title","author","contributor","publication year","abstract","subject topic","language","publication type","publisher","isbn","issn","patent","patent status","bibliographic note","access restriction","embargo date","faculty","department","research group","programme","project","coordinates"
"uuid:ee06f0fb-aeb1-4fff-8905-1da3df4e5133","http://resolver.tudelft.nl/uuid:ee06f0fb-aeb1-4fff-8905-1da3df4e5133","Improving the data quality checking process during the design phase: Development of a design-integrated data checking and reporting tool","Alonso Candau, Jaime (TU Delft Civil Engineering & Geosciences)","Wamelink, J.W.F. (mentor); van Nederveen, G.A. (mentor); Wang, T. (graduation committee); Arts, D. (graduation committee); Delft University of Technology (degree granting institution)","2023","One of the crucial aspects of BIM is the data rich environment connecting project information from different sub-sectors. (Mesároš et al., 2020). Therefore, developing models with consistent and trustworthy building data has gained significant importance in the industry. In contrast, incorrect or incomplete building data in a model could result in chained mistakes across disciplines, rework, or inadequate models for other stages of the building lifecycle.
Most of the improvements in BIM data in organisations take place in data quality reviews by BIM specialists. The lack of integration and complexity of existing data checking tools raised the expertise leading to assessment tools used mostly by BIM specialists. After a specialist reviews a project, corrections are communicated to the designers to solve the data issues in their models. This process is repeated until the desired quality is reached by the design team. Furthermore, missing, or wrong basic data structure can often lead to incomplete or inaccurate data checking processes.
The higher goal of this research is to produce perceivable benefits in the organisational data checking process. This is approached by facilitating the implementation of BIM standards and increasing the compliance of objects during design periods before entering the organisational review. Previous research showed that professionals would prefer to use simple dedicated quality checkers that can minimise manual tasks precisely and reliably instead of advanced software solutions. Thus, the goal is not to replace current workflows and practices, but instead to enhance basic data structures in models before entering the data reviews, by developing and implementing a new design-integrated checking and reporting tool.
The new checking process was verified and validated with specialists and modelers in three ongoing projects. This research showed that the developed design-integrated tool can produce the perceivable benefits in the organisational data checking process explained below:
•Enhancements in data quality before and after regular organisational checking reviews.
•Decrease in the duration and iterations in the organisational reviews.
•Increase of effectiveness and efficiency in detection and correction of data quality issues.
•Decrease of personnel frustration in the organisational process.
Thus, the research fulfilled the main objective to produce perceivable benefits in the organisational data checking process by developing and implementing a dedicated solution that engages designers in the process. The role-specific approach was essential to achieve a solution that meets the specific needs and system requirements of the target group, the designers. The purpose was to add a new prechecking layer to support and enhance existing data quality practices and processes. The result was a steering instrument for modelers working on the detailed design phase to involve them in identifying and correcting data quality issues.
Although the perceived benefits may vary in different contexts and organisations, the new data checking and reporting solution would raise awareness and promote designers’ engagement in the organisational data checking process, who are in a dominant position to identify and correct data quality issues.","BIM; Business Process Improvement; Data Quality; BIM Standards","en","master thesis","","","","","","","","","","","","Civil Engineering | Construction Management and Engineering","",""
"uuid:27823a21-e33a-494d-b2df-46aea9e7b6bd","http://resolver.tudelft.nl/uuid:27823a21-e33a-494d-b2df-46aea9e7b6bd","An innovative way to transport and spool offshore power cables using SPMTs: Global design improvement of a containerized carousel system","Slingerland, Bas (TU Delft Mechanical, Maritime and Materials Engineering)","van den Bos, W. (mentor); Schott, D.L. (graduation committee); Frikkee, E.A. (graduation committee); Harms, I. (mentor); Delft University of Technology (degree granting institution)","2023","Mammoet is developing a new type of system for the transportation of offshore power cables. With this system the cables can be spooled, stored, and transported both on land and on heavy transport vessels in a more efficient way. There are a few uncertainties for the system, mainly about the loads on the carousel and the behavior of the cable stack. These uncertainties resulted in some assumptions that have been used for the proposed design. Furthermore, there are a few challenges for the system that need to be addressed to compete with the current offshore power cable transportation methods. The main challenges include the structural strength and stability in combination with the self-weight, the used cylinder stroke of the hydraulic SPMT cylinders and other issues with the SPMTs. In this study these uncertainties and the challenges for the current design of the system are investigated, which resulted in more insight in the uncertainties and a new concept with improved performance against the challenges.","Carousel; Heavy transport; Offshore power cables; Offshore power cable transport; Design improvement","en","master thesis","","","","","","","","","","","","Mechanical Engineering | Multi-Machine Engineering","",""
"uuid:77736000-30c1-4c51-be17-bc34bb2037ab","http://resolver.tudelft.nl/uuid:77736000-30c1-4c51-be17-bc34bb2037ab","Bio2Cementation: A novel treatment coupling clay aggregation and bio-cementation in sand-bentonite porous media","Wennubst Pedrini, Rocco (TU Delft Civil Engineering & Geosciences)","Dieudonné, A.A.M. (mentor); Gebert, J. (graduation committee); Jonkers, H.M. (graduation committee); Delft University of Technology (degree granting institution)","2022","The geo-technical quest to couple technical, environmental, and economic innovation, has increased recent attention towards bio-inspired soil strengthening techniques. This thesis presents a proof-of-concept for a coupled clay inhibition and bio-cementation treatment tested in sand-bentonite, referred to as Bio2Cementation. Fine particles are first aggregated using a nitrogen based compound. By binding the electrical double layer of clay minerals, the aggregates become chemically and physically stable. Thereafter, bio-cementation treatments hydrolyze urea to precipitate calcium carbonate crystals within the pore space. The crystals bind the mineral particles, increasing the strength and stiffness of the soil.
State of the art considerations regarding enzyme induced calcite precipitation and guanidinium hydrochloride research are used as the theoretical foundation for the treatment’s design. A diverse sand-bentonite matrix is tested, comprised of 10% and 30% bentonite, to evaluate the applicability limits of the technique. The implementation is tested in flow-cells, whereby soils are injected with Bio2Cementation treatments. Experiments show the dominant role of guanidine for stabilizing clay particles – the matrix aggregates, hydraulic conductivity improves by two orders of magnitude, surface charge interactions are minimized, and swelling is halted irreversibly. Hydraulic conductivity calcultations, unconfined compressive strength tests, image analysis of Micro-CT scans, and scanning electron microscope imaging evidence to notably improved bio-cementation following guanidine injections. Consistently, the optimized enzyme induced calcite precipitation was found to crystallize vigorously in 10% bentonite samples, but less successfully in optimally compacted 30% bentonite soils. The concept of Bio2Cementation is proven to work within certain limitations.
Future research should explore the role of different clay minerals such as kaolinite, in view of better defining the treatment’s engineering applicability in-situ. Additional strength testing, soil-structure interaction analyses and environmental impact studies are also recommended
This work proposes an energy harvesting platform that is able to convert power from both DC sources (photo-voltaic cells and TEGs) as well as piezo element sources. It does so only using a single input channel to which a single harvester can be connected. The proposed system is able to differentiate between the two source types and adjust the power converter configuration accordingly.For the DC sources, a novel switched-capacitor power converter (SCPC) is proposed, that is able to convert the energy from a harvester that has a maximum power point (MPP) output voltage of 170mV to 5V and a maximum power point output power of 10uW to 50mW. This DC-DC converter offers 119 different positive voltage conversion ratios, with a maximum voltage conversion ratio of 16, using four in-package capacitors. As a result of this high number of conversion ratios, the MPP output voltage of the harvester and the input voltage of the power converter are matched accurately, causing the harvesting efficiency to be very high. A maximum harvesting efficiency of 96.2% is found in simulations. For the piezo element sources, the concept of a flipping-capacitor rectifier (FCR) has been adjusted to work in harmony with the designed SCPC. In a steady-state condition, the capacitors of the SCPC reach specific voltages, such that they can create evenly spaced voltage steps for the flipping operation. With this technique, a voltage flipping efficiency of 0.9375 and a theoretical maximum output power improvement rate (MOPIR) of 32 can be reached. Due to losses in the system, simulation results show a MOPIR of up to 20.0, which is still significantly higher than the state-of-art. The system is designed to work with harvesters with a piezo capacitance of up to 100nF, an excitation frequency of 1Hz to 200Hz and an equivalent FBR maximum power point output power of 1uW to 50mW. An implementation of the proposed system is discussed and simulated. The total active silicon area for the designed system is 2.12mm2 in a 0.18 um TSMC technology.
The thesis starts with a literature study on eight business process improvement methodologies (BPIs), viz. Lean, Six Sigma, Lean Six Sigma, Total Quality Management, Lean MRO, Total Productive Maintenance, Business Process Reengineering, and Business Process Improvement. These BPIs are compared with each other in an overview based on nine characteristics. Then, a ninth BPI is studied: process mining. The literature on this topic is scattered, but a study is conducted on several element. After that, pros and cons are discussed and process mining is placed in the overview of BPIs.
A combination of desk and field research leads to the improvement of the best practise methodology PM2. And this improved methodology, called PM3, is further within MoD. Next to that, a process mining decision framework is developed according to the waterfall model. This framework can score business process models on several characteristics. The resulting total score determines whether process mining can successfully be applied to improve the process.
For MoD, process mining can be a valuable instrument for improving processes. It can convert a gut feeling into clear numbers and models, which can form the start of an improvement project. It is thus recommended to make process mining available to the organisation.
The thesis gives a good insight in the possibilities of process mining, but it also comes with several opportunities for future research. For example, PM3 has demonstrated itself in the field, but this have not yet led to measurable improvements (only important insights in the processes). Future research is required to verify its true potential. Second, the decision framework is tested by assessing fourteen of MoD’s processes and evaluated by discussion it with ten system experts. Yet again, empirical research is probably the only way to truly verify it, but this was not possible during the thesis. Third, both PM3 and the decision framework focus on MRO within MoD. It is unlikely that a change of domain or organisation makes a significant difference, but the possibility should be taken into account and further investigated. And finally, a significant limitation of the framework is that it only scores on process mining. So, if it presents a very low score, it does not suggest an alternative BPI. This fell outside the scope of the thesis, but is nevertheless an interesting research opportunity.
Scaled down experiments were performed in a water channel, housed in the Laboratory for Aero and Hydrodynamics at the Delft University of technology. Simultaneous measurements of the flow velocities and dye intensities in the symmetry-plane of the channel were made through planar Particle Image Velocimetry (PIV) and Planar Laser Induced Fluorescence (PLIF). A few flow configurations were studied by varying certain parameters. It was found that: (a) ESP installation is more beneficial on top of shorter sound barriers. (b) Slightly raising the ESP from the top of the sound barrier is advantageous. (c) Installation of ESPs in isolated highway canyons should be done with care, as several flow regimes are observed.
First order estimates on the aerodynamic efficiencies of the ESP were determined. This was accompanied by the identification of ESP performance trends that should serve as a guideline for the initial testing of the ESPs at full scale. The guidelines include the physical location and entrance orientation of the ESP. It is known that the collection efficiency of the ESP is a function of the incoming flow velocity. It is recommended that the entrance flow velocities reported here be used as an input for calculating the associated particle collection efficiency. Together, the collection and aerodynamic efficiencies can be used to estimate the overall efficiency of the ESP. If the overall efficiency satisfies a minimum desirable threshold, the field experiments yield promising results, the device clears safety requirements, and the benefits outweigh the costs, the ‘Open Air Line ESP’ can be installed along the highways en masse in the future.","Pollution dispersion; Scaled down experiments; Aerodynamics; Particle Image Velocimetry; Laser Induced Fluorescence; Particulate Matter; Air quality improvement; Electrostatic Precipitators; Sound barriers; Highways","en","master thesis","","","","","","","","","","","","","",""
"uuid:5ade9836-fc21-4889-a328-bd3ef7062f12","http://resolver.tudelft.nl/uuid:5ade9836-fc21-4889-a328-bd3ef7062f12","Discovering the Potential of Risk-based Critical Chain Project Management in the Maritime Industry","van Bouwelen, Björn (TU Delft Mechanical, Maritime and Materials Engineering; TU Delft Marine and Transport Technology)","Hopman, J.J. (graduation committee); Coenen, J.M.G. (mentor); Veeke, H.P.M. (graduation committee); Henstra, Wouter (graduation committee); Delft University of Technology (degree granting institution)","2017","There is a never-ending quest to search for better ways of planning and controlling projects. Currently the majority of all projects are planned with the critical path method and controlled using earned value management. This way of planning and controlling projects has been used for decades now and can be seen as traditional project management (PM). This current PM paradigm does not work well enough for one-off projects. Risk assessment and risk management are not sufficiently covered in most standard PM methods. This thesis looks at the potential of critical chain project management (CCPM) in combination with extensive risk management techniques for improving project performance. The thesis will cover the development of a risk-based critical chain project management (RCCPM) methodology and its application to case studies at a shipyard. The study concludes that RCCPM is a viable alternative for traditional PM in the maritime industry. Improvements include, amongst others, a reduction of the lead-time, more effective monitoring and controlling, and improved dealing with risks and uncertainties.","Critical chain project management; Project management; Process improvement; Project risk management; Project planning; Uncertainty; Monte Carlo simulation; Shipbuilding","en","master thesis","","","","","","","","2022-08-23","","","","Marine Technology | Ship Design, Production and Operations","SDPO.17.026.m",""
"uuid:7f80e883-936c-4abe-ac4b-2c5c15e9cb1f","http://resolver.tudelft.nl/uuid:7f80e883-936c-4abe-ac4b-2c5c15e9cb1f","The potential of advanced data analytics using machine learning to increase overall equipment effectiveness in an underground mining operation","Wansink, Jan-Douwe (TU Delft Civil Engineering & Geosciences; TU Delft Geoscience and Engineering)","Buxton, M.W.N. (mentor); Delft University of Technology (degree granting institution)","2017","Changing market dynamics make that mining companies need to increase their equipment utilization and use their equipment more effectively. The growing availability of data from mining equipment and mining operations enables the use of data analytics to achieve that goal. This thesis explores the potential of data analytics and machine learning to increase equipment utilization through the means of a case study on an underground South African diamond mine. To identify and quantify the potential of data analytics for operational improvement a benchmarking analysis of the operation was done using operational equipment effectiveness (OEE) as a measure. The outcome of this indicated that there was significant value to be unlocked if unplanned breakdowns were mitigated and unscheduled maintenance could be moved into scheduled maintenance. This led to believe that there was a solid case for breakdown prediction based on equipment sensor data using advanced analytical techniques. Data availability and quality made that the proof-of-model was initiated for one 10 ton loader with the target components for breakdown prediction being the engine, transmission and brakes. After extensive data cleaning and preparation various machine learning algorithms adopted from various non-mining disciplines were used for training predictive models. The best result was yielded using support vector machines (SVM) showing a very high accuracy (>80%) with little misclassifications. Random forests and anomaly detection were also tried but the unbalanced and noisy nature of the data made for the performance of these models not leading to satisfactory levels. The results of this modelling exercise combined with the OEE analysis give enough confidence to accept the hypothesis that there is good potential for application of advanced analytics to increase the operational effectiveness of underground mining equipment.","OEE; Operational Equipment Effectiveness; Machine Learning; Failure Prediction; Predictive Maintenance; Mining; Underground Mining; LHD; Loader; Continuous Improvement; Random Forest; Support Vector Machines; Unbalanced Data; R; SMOTE","en","master thesis","","","","","","","","2022-08-21","","","","Applied Earth Sciences","",""
"uuid:c93d7002-911b-4508-84b3-faa4490fc4f7","http://resolver.tudelft.nl/uuid:c93d7002-911b-4508-84b3-faa4490fc4f7","Improving the operational availability of the ships of the Royal Netherlands Navy","van Donkelaar, A.","Veeke, H.P.M. (mentor); Driegen, F.J. (mentor)","2017","The current developments in the world result in increasing tensions between different countries. This increasing tension requires materials that are available when needed. Major budget cuts have resulted in the disposal of six multipurpose frigates which has reduced the total amount of frigates owned by the Royal Netherlands Navy from twelve to six. Because of this significant reduction, a high availability of the remaining frigates and oceangoing patrol vessels is required. However, the availability of these vessels is not sufficient at the moment. In this research a suitable definition for the term 'availability' was found in the term 'operational availability' which is a function of the maintenance process. With this definition the operational availability of the multipurpose frigates, air defence and command frigates and oceangoing patrol vessels was calculated. The calculation showed that the operational availability of these ships does not meet the operational availability requirements. The maintenance process was analysed by using the Delft Systems Approach to determine the problems that cause the low operational availability of the ships. The analysis showed a significant amount of problems that influence the operational availability of the ships in a negative way. This study developed a continual process improvement dashboard that can be used by the Royal Netherlands Navy as a tool to improve the operational availability of their existing ships. Besides that, the dashboard can also be used in the design process of a new ship class to achieve the desired operational availability for the new ships.","Operational Availability; Delft Systems Approach; Continuous Process Improvement; Royal Netherlands Navy","en","master thesis","","","","","","","","","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","","Transport Engineering and Logistics","",""
"uuid:317ded61-5c43-4b0e-bb2a-ef9fc5dba502","http://resolver.tudelft.nl/uuid:317ded61-5c43-4b0e-bb2a-ef9fc5dba502","Process improvement to shorten the lead-time for the ACD division in the distribution center of L’Oreal located in Alphen aan den Rijn","Jacquemijns, J.","Negenborn, R.R. (mentor)","2017","The thesis is about process improvements in L’Oréal’s distribution center. A framework is developed based on the DMAIC approach, process improvement methodologies and solution evaluation methodologies. The current process is discussed and with the Lean Six Sigma philosophy measures of improvement are developed. The requirements for the improvements were creating flow, reducing waiting time and providing insights. Five different improvements were developed and the dynamic wave and resource planning improvement scored the highest. This improvement provides a tool for the supervisors and team-leaders to prioritize work and manage the employees in a better way. A simulation was conducted to quantify the lead-time improvement. This simulation resulted in a reduction in lead-time of 5 till 47% bringing the average lead-time down from 2.2 to 1.5 days.","process improvement; distribution center; warehouse; capacity; lead-time reduction; L'Oréal","en","master thesis","","","","","","","","2017-03-09","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","","Transport, Infrastructure and Logistics","TIL5060",""
"uuid:3ecd2f62-8145-4630-bd48-dbfb0157a8a5","http://resolver.tudelft.nl/uuid:3ecd2f62-8145-4630-bd48-dbfb0157a8a5","Dynamic Analysis of a subsea cable during cable installation: Improving operability of the cable installation for shallow and deep water","Bui, N.C.","Metrikine, A. (mentor); De Oliveira Barbosa, J.M. (mentor); Jarquin Laguna, A. (mentor); Natarajan, G. (mentor); Visser, C. (mentor); Hassan, M. (mentor)","2016","The investigation into the dynamic behavior of a cable during installation was done with the aim of improving cable installation for safety, operational and commercial value. In order to increase the operational limit of the vessel during cable installation, the investigation into improvement systems was desired. The workability of a vessel during cable laying operations is governed by the cable integrity design criteria such as maximum tension, touch-down-point tension, side-wall-pressure and the minimum bending radius. In practice during cable-laying the touch-down-point tension and minimum bend radius cannot be measured. Therefore a dynamic analysis of the subsea cable is required to determine the cable motions and tension fluctuations. The main objective of this Master Thesis is to develop and investigate two cable lay improvement systems. Both systems are modeled in OrcaFlex software to analyze its improved effect on the workability during cable laying operations. The cable integrity design conditions are compensated by either active force control at the tensioner systems or by active position control near the departure point on the chute. By controlling one of the two parameters the catenary shape is stabilized and therefore the fluctuating tension and cable motions are controlled. Force control is developed in OrcaFlex by a Tensioner System controlling the tensions in the load cells at a target value, position control is controlling the chute-end location with an Active Heave Compensated Chute System. To actively control the improvement systems, a Proportional-Integral-Derivative (PID)-Controller is used in OrcaFlex as external function where the performance dependents on the defined PID-Parameters. To optimize the improvement systems further, first simplified 1-Degree Of Freedom (DOF) analytical position controlled models are developed to identify the initial guess PID-Parameters. Subsequently, a 6-DOF position (left picture) and force (right picture) controlled models in OrcaFlex, was developed and simulated using the obtained initial guess PID-Parameters. In OrcaFlex the PID-Parameters are further adjusted using regular wave theory to achieve the full performance capacity of the improvement systems based on data obtained from existing systems on the market. Finally a detailed numerical model is developed and analyzed for irregular wave heights to obtain the workability plots. The numerical models are subjected to environmental and hydrodynamic loads during a three-hour simulation. Results show that the force and position controlled systems are able to improve the cable integrity design conditions significantly, but more for the position controlled system. The force controlled system is limited by the pay-out velocity for deep water and by cable compression and the minimum bending radius at shallow water, whereas the position controlled system is limited by the stroke of the cylinder. Also it has been found that the controller performance for the force controlled system must be adjusted for different range of waterdepth, while the position controlled system maintains the same performance. Furthermore, the position controlled system is able to hold the catenary shape nearly still, significantly more that it does for the tension controlled system. In conclusion an increased workability during cable installation can be achieved with one of the improvement systems.","cable; workability; improving; tensioner system; heave compensated chute; OrcaFlex; PID-Controller; Tension; compression; minimum bend radius; side wallpressure; catenary shape; integrity","en","master thesis","","","","","","","","2021-11-07","Civil Engineering and Geosciences","Hydraulic Engineering","","Offshore and Dredging Engineering, specialisation: Bottom Founded Structures, Artic & Wind","",""
"uuid:c08c31c0-0c36-4d00-9a86-7fb532a1379e","http://resolver.tudelft.nl/uuid:c08c31c0-0c36-4d00-9a86-7fb532a1379e","The necessities to improve water recreation on the Mill Creek in Walla Walla","van Hoof, S.","Verhagen, H.J. (mentor); Sloff, C.J. (mentor)","2016","In Walla Walla, Washington the Mill Creek flows through an outdated concrete spillway that needs renovation. The city council of Walla Walla saw this as an opportunity to further develop this channel. Their desires include conservation of the fish ladder, enabling to sail by boat and to prettify the spillway. A Sobek 1D model was built to give a proper insight of the current situation. To verify the model calibration was done by using USGS data and GIS maps of the Walla Walla council. Also various design alternatives were specified to see which form of recreation is most feasible. The results from the model in the current situation showed that the water depth was too low while its velocity was too high for the different vessels. To solve this issue, an upgrade for the concrete spillway was proposed. By roughening the riverbed and placing groynes into the creek, the water depth increased and the water velocity dropped, according to the improved model. However, the design is a rough sketch that forms the base for a more detailed study. It is recommended to continue improving the model to verify the results which are presented in this report to be sure the proposed upgraded design will contribute to the desires.","River improvement; Sobek; Washington State","en","bachelor thesis","","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","","46.068084, -118.328963"
"uuid:57010309-6d13-4766-ab16-1902af5778fd","http://resolver.tudelft.nl/uuid:57010309-6d13-4766-ab16-1902af5778fd","Designing a seamless passenger journey: Picking up luggage from origin to destination and back","Marie, A.H.L.","Bergema, C.P.A.M. (mentor); Ottens, R. (mentor)","2016","Royal Dutch Airlines (KLM) and the Technical University Delft, faculty Industrial Design Engineering (IDE) are working together on the Personalised Airport System for Seamless Mobility and Experience (PASSME) project.. There are two problems derived from the PASSME project. First, airport processes are not seamless, because passengers spend relatively much unwanted time at the airport. PASSME’s objective is to reduce the time spent on handling luggage by 30 minutes. Secondly, the current state of luggage check-in for passengers is experienced as negative in 21% of the cases. It is experienced as heavy, a hassle and it creates stress. PASSME aims to improve the entire quality of experience of the door-to-door journey for at least 70% of the passengers. During the internal research at KLM, different problems were found at the luggage check-in. Passengers spend on average 6 minutes and 11 seconds at the SSDOP and 9 minutes and 50 seconds at the CUDOP. When researching the current situation for passengers several things can be concluded. A quantitative research is performed (n=86) to research the experience passengers have during their passenger journey with check-in luggage. From the research it can be deduced that passengers travelling by public transport, experience the journey less positively (4.7 out of 7), than passengers who use other types of transportation (car 5.9 out of 7, taxi 6.2 out of 7). These passengers need to travel with their check-in luggage by train, bus, metro and other public transports to reach the airport. And this travelling on public transport with their check-in luggage, causes a more negative experience and emotions, because carrying the luggage from bus to train or storing the luggage, is experienced as not very positive. After this research it became clear where improvement was possible for passenger and airline. The experience can be improved for passengers who travel by public transport. Unwanted airport time can be reduced at the luggage check-in and at the reclaim belt. The solution is a door-to-door luggage service. The luggage is picked-up by a logistic partner at the home address of the passenger. The luggage is transported by a logistic partner to the accommodation of the passenger. This means that the luggage is removed out of the passenger journey from home to airport. The door-to-door luggage service improves the passenger experience when travelling to the airport by public transport from a 4.7 to 6.3. Because of this service, the passenger does not have to handle the check-in luggage anymore from origin to airport. Since this service removes the check-in luggage from the airport, the passenger does not have to spend time at the luggage check-in area nor at the reclaim area. In total, the waiting time and processing time for passengers can be reduced from 29 minutes to 34 minutes, when the door-to-door service is used.","seamless flow; KLM; luggage; door-to-door; passenger journey; improve experience; reduce unwanted airport time","en","master thesis","","","","","","","Campus only","","Industrial Design Engineering","Strategic Product Design","","","",""
"uuid:ebed9a0a-0fce-4005-8c0b-17455b2fa10d","http://resolver.tudelft.nl/uuid:ebed9a0a-0fce-4005-8c0b-17455b2fa10d","An Experimental Investigation on the Rock Mechanical Behavior of Synthetic Layered Systems and Load-Cycling of its Individual Constituents","Janmahomed, F.R.","Barnhoorn, A. (mentor)","2016","Many authors already made an attempt to understand the effect of load-cycling on material strength and the evolution of elastic parameters. However, until now there was no study on the effect of load-cycling on the evolution of elastic parameters over the complete stress strain curve, i.e. the linear elastic regime, the fracturing regime, and the fractured regime. In addition, none of the authors focussed on the effect of load-cycling on fracture network improvement. Although previous studies already showed that elastic moduli of layered systems may be determined from properties and volume fractions of its individual constituents, there is no study done on the relation between rock mechanical properties, i.e. strains and yield or failure stresses, of (synthetic) layered systems and its constituents. Furthermore, in the literature no description is found on fracture characteristics of a (synthetic) layered system. Hence, an experimental investigation is conducted on the rock mechanical behavior of synthetic layered systems subjected to increased-loading and the effect of load-cycling on its individual constituents’ rock strength, elastic parameter evolution, and fracture network improvement. The increased-loading and load-cycling rock mechanical experiments are unconfined compression tests performed at room temperature. When comparing two of the same rock materials with a maximum deviation of 1% in porosity, load-cycling leads to failure at much lower stress levels when compared to increased-loading. Within the linear elastic regime, load-cycling returns a stabilized Young’s modulus which is always larger than its envelope value, while the Poisson’s ratio of the last load cycle coincides with its envelope value. Load-cycling generates an improved fracture network when compared to increased-loading. Characteristics of the improved fracture network are the increased fracture densities and the more uniform distribution of the fractures over the volume of the material. For vertically stacked synthetic layered systems, the elastic moduli and strains can be well-predicted by the Reuss Average which uses the average rock mechanical properties and volume fractions of the individual constituents. In contrast, for synthetic layered systems the stress level at failure point is independent of the volume fractions of its constituents and is observed to be in the vicinity of its weakest constituent. Despite this, fractures are still observed in the strongest constituents. The fracture propagation through the strongest constituent is ascribed to be due to amplified stress concentrations at the tip of the propagating fracture. However, from 2-layered systems it is observed that fracture propagation through the strongest constituent depends on the thickness of the weakest constituent. At the constituents’ boundary in synthetic layered systems, there is no offset in fracture path when going from one constituent to another nor is there a sudden change in aperture. However, there is a change in fracture inclination in a way such that the fracture inclinations of the individual constituents are respected. In addition, fractures in synthetics include cataclastics over the high porous intervals (±10-25%), while the same fracture is clean over the low porous intervals (±0,5-5%).","Rock Mechanics; Load-Cycling; Increased-Loading; Fracture Improvement & Characteristics","en","master thesis","","","","","","","","","Civil Engineering and Geosciences","Geoscience & Engineering","","Petroleum Engineering","",""
"uuid:d40011ba-73d4-4f48-a76d-1abde874dddb","http://resolver.tudelft.nl/uuid:d40011ba-73d4-4f48-a76d-1abde874dddb","Residential energy rebound effect assessment by using serious games","Garay Garcia, O.","van Daalen, C. (mentor)","2016","Energy reduction has been on the political agenda since the last couple of decades. One of the most common policies to reduce energy consumption has been improving efficiency. However, the phenomenon called the rebound effect may threaten the effectiveness of policies aiming to reduce consumption by improving efficiency. The rebound effect is the process in which energy savings, after energy efficiency improvements, are lower than expected. The scientific community agrees on the existence of the rebound effect and the possibility to measure it. In spite of this agreement, the rebound effect has been catalogued by many scholars as a highly controversial concept. In fact, the two main controversies around the rebound effect are: its size and its importance for the policy making process. The main causes that have produced the rebound effect to be controversial are: methodological issues of previous attempts to assess the effect, different numeric definitions and fuzzy and different system boundaries. The main objective of this thesis research was to find a new and innovative methodology to assess the rebound effect in order to improve the methodological issues of previous attempts that have analyzed the rebound effect. As a result, in reducing the causes of controversies, the controversies themselves may be reduced as well. The methodology that seems to improve the mentioned methodological issues is serious games. Serious games have several advantages that seem to fit and solve the shortcomings of the previous attempts that have analyzed the rebound effect in the past. In particular, the NRG game is the specific serious game that was used to perform the actual assessment in this research. The NRG game was used to carry out a new rebound effect assessment. In doing so, 50 people played the game in two different groups in a way to perform a modified before/after analysis: one group of 25 people using a low efficiency house and 25 people using a high efficiency house. The conclusions of this assessment showed that the rebound effect was, indeed, detected to be present when the behavior of the two groups was compared. In fact, two main signs of the rebound effect were detected. First, having a low efficiency made the low efficiency group to reduce their energy consumption more than the high efficiency group. Second, having a high efficiency made the high efficiency group to increase their comfort level (a direct measure of the luxury level of their houses in the game) more than the low efficiency group. As a result, the rebound effect was detected by keeping track of the total energy consumption and comfort level of each player. In addition, some of the methodological issues of previous rebound effect assessments that have used before/after analysis were improved, for instance, the possibility to perform ex-ante assessments, the inclusion of psychological factors of people in the results without making inaccurate assumptions and the inclusion of more than just one energy services in the experiments, among others. As a result, serious games were proven to be a handy tool to assess and analyze the rebound effect, improving the quality of previous assessments. Despite having proved the usefulness of serious games in assessing the rebound effect, some limitations of this research were identified: the sample under study was not a good representation of the population, the reliability of the rebound effect size calculation is compromised, the findings of this assessment can’t be applied in a real life context and so forth.","rebound effect; serious games; before/after analysis; energy reduction; energy efficiency improvements","en","master thesis","","","","","","","","","Technology, Policy and Management","Multi Actor Systems","","Policy Analysis","",""
"uuid:7ec271ca-2a51-4b89-b4ef-9e2badeb0493","http://resolver.tudelft.nl/uuid:7ec271ca-2a51-4b89-b4ef-9e2badeb0493","Lowering the Turnaround time for Aircraft component MRO services: A case study at KLM Engineering & Maintenance","Van Rijssel, R.E.","Lodewijks, G. (mentor); Beelaerts van Blokland, W.W.A. (mentor); Van Duin, J.H.R. (mentor)","2016","In this thesis a framework is built to find flow improvement measures to lower the turnaround time for aircraft component MRO processes. This framework is tested in a case study at KLM E&M. The main research question that is answered in this research is: What flow improvement measures can be used to lower the turnaround time of components in aircraft component MRO processes such that the average turnaround time can be lowered from 21 to 10 days at KLM E&M? To create this framework, case studies of aircraft component MRO processes were analyzed. Four quantifiable characteristics were found, being: flow type, amount of repair paths, equipment criticality and the moment of work-scope determination. Afterwards applicable improvement theories were studied on these characteristics and a framework was created for aircraft component MRO process flow improvement. Hereafter, a case study process was researched using the DMAIC cycle. First of all, it is advised to introduce two new KPI's; the 'TAT-waiting time' and the 'On time start', to monitor the waiting time. Furthermore, it was found that the shop has a single piece flow, the process follows a single path, the equipment is not critical and that the work-scope is determined during the process. When these characteristics are put in the flow improvement framework, it can be seen that lean, lean in MRO and quick response manufacturing fit best for the case process. However, in the case process the work-scope determination should be moved forward to be able to plan the work better and create a pull process. The selected improvement theories were researched in more detail on flow improvement measures. By using a simulation model it was found that with a supermarket system with a capacity constraint, an increase in technician capacity, lower disruption times and amounts, it is possible to lower the total TAT of the case process to 10 days on average. It can therefore be concluded that the improvement framework works for this case. For further research it is recommended to investigate the use of other simulation software and expand the simulation model to the total component MRO supply chain. Furthermore, it is advised to test the framework on other processes within KLM E&M and at other aircraft component MRO companies.","flow improvement; lean; MRO; aircraft component; turnaround time; simulation; DES; simio; maintenance","en","master thesis","","","","","","","","","Mechanical, Maritime and Materials Engineering","Transport Engineering and Logistics","","Transport, Infrastructure and Logistics","",""
"uuid:4ff08fbb-2bbe-40da-90b0-77b3075876cd","http://resolver.tudelft.nl/uuid:4ff08fbb-2bbe-40da-90b0-77b3075876cd","Improving sport rehabilitation","Rosales, J.R.","Goossens, R.H.M. (mentor); Minnoye, A.L.M. (mentor); De Vos, R.J. (mentor)","2016","Rev is the final design product service system that can help athletes rehabilitate from traumatic ankle injuries. It does so by calibrating strength and stability of the unaffected leg and comparing it with exercises of the affected leg.Therefore communicating strength percentages back to the athlete. This enables the ultimate goal of increasing strength performanc to a functional recovery.","improving; design; rehabilitation; sport","en","master thesis","","","","","","","Campus only","","Industrial Design Engineering","Applied Ergonomics and Design","","","",""
"uuid:c42267b8-d944-496c-9497-c6622b0bb447","http://resolver.tudelft.nl/uuid:c42267b8-d944-496c-9497-c6622b0bb447","Improving project monitoring in subcontracted production projects: The development and implementation of a functional control framework to support monitoring in subcontracted one of a kind production projects","De Jonge, W.P.N.","Pruyn, J.F.J. (mentor)","2016","This paper describes the development and implementation of a framework that localizes steady-state-monitoring in subcontracted mega-yacht-production processes. The control framework modelling this steady-state based on the Delft Systems Approach, strives for continuously improved project monitoring and is comprises subcontractor management- and project control strategies. The framework accompanied by a roadmap for indicator development, supported the implementation of performance indicators. The implementation of performance indicators inspired by the lean production perspective, resulted in improved project monitoring in subcontracted production projects. It has after deployment been proven that the framework contributed to improved project monitoring during outfitting. The effective implementation of five indicators reflecting on various wasteaspects in subcontracted production, demonstrated the potential for root cause analysis and process improvement.","Delft Systems Approach; control framework; production monitoring; subcontracted production project; improvement; performance measurement; mega-yacht-building; operations monitoring","en","master thesis","","","","","","","","2021-05-18","Mechanical, Maritime and Materials Engineering","Marine & Transport Technology","","Masters Ship Production (SDPO)","",""
"uuid:2b4afb5e-c179-43df-af58-a33c859fa26f","http://resolver.tudelft.nl/uuid:2b4afb5e-c179-43df-af58-a33c859fa26f","Efficiency of a Column Supported Embankment in Sabkha Soil","Lamoré, R.","Hicks, M.A. (mentor)","2016","This thesis report presents an investigation of a soil improvement technique that is being executed for a Van Oord project in Kuwait. The soil is improved by the use of a column supported embankment, consisting of sand columns installed in a soft soil layer and a sand platform. The efficiency of this method is defined in terms of stress transfer and settlement reduction. When the soil improvement is finished and the land will be used, there are conditions concerning bearing capacity and settlement behavior. To this extent two important parameters were defined. i.e. the incremental efficiency (the load increase in a sand column over the total surface load increase) and incremental settlement reduction ratio (the settlement of the improved soil over the settlement of the unimproved soil (i.e. soil that has not been improved by sand columns), under loading). To determine the efficiency of the soil improvement, a number of tests were performed on site. Tests included plate load tests (in this thesis referred to as zone load tests). The load tests were simulated in Plaxis, with the known load/settlement results the model could be benchmarked. Furthermore soil samples were taken and tested to determine the local soil characteristics. The parameters derived from the soil tests are also used in the Plaxis calculations. Plaxis allows for a step-by-step consolidation of the soft soil in which the columns were installed. It can be seen that the stress distribution changes for different stages of consolidation. The columns are first constrained by the very stiff soft soil layer (due to high excess pore pressures under loading). When the pore pressures dissipate the constraining stress is lowered and the column head expands. Under vertical loading the stress in the column head has a funnel shape, due to the displacements in the outer ring of the column head. Based on the Plaxis calculations it can be concluded that when a load is activated on top of a surface of soil that has been improved by the use of sand columns (with a center-to-center distance of three meters), given that the platform is thick enough, 60% of that load is transferred to the column. With a greater center-to-center distance between the columns that percentage decreases, e.g. 28% for a column spacing of five meters. Compared to existing theories by Hewlett and Randolph (1988) and Zaeske (2001) (it should be noted that most existing theories assume presence of geosynthetic reinforcement, which is not the case for this project) the calculated column force is relatively low. A minimal thickness of the sand platform is needed to facilitate maximum efficiency. The thickness as determined by the Plaxis calculations are lower compared to existing literature. With platform heights of up to seven meters no full arching was observed, however partial arching did occur as evidenced by the efficiency values.","CSE; Column Supported Embankment; Sabkha; Soil Improvement; Columnar Inclusion; Dynamic Replacement","en","master thesis","","","","","","","","2016-03-24","Civil Engineering and Geosciences","Section Geo-Engineering","","","",""
"uuid:cfb6a67e-48b1-4360-92c4-28a772881240","http://resolver.tudelft.nl/uuid:cfb6a67e-48b1-4360-92c4-28a772881240","ICT as enabler or inhibitor of Lean Six Sigma Process Improvement","Bras, J.A.","Aldewereld, H.M. (mentor); Janssen, M.F.W.H.A. (mentor); Warnier, M.E. (mentor); Verburg, Q. (mentor)","2016","","Lean Six Sigma; ICT; Inhibitor; duality of technology; enabler; improvement","en","master thesis","","","","","","","","2016-01-25","Technology, Policy and Management","Engineering Systems and Services","","Management of Technology","",""
"uuid:3cdd5d24-9d46-4e8b-aad4-9a415a40da31","http://resolver.tudelft.nl/uuid:3cdd5d24-9d46-4e8b-aad4-9a415a40da31","Development of the Generalised Hybrid Turbulence Model for RANS simulations","Meijers, P.C.","Uijttewaal, W.S.J. (mentor); Van Zuijlen, A.H. (mentor); Florentie, L. (mentor)","2016","Turbulence plays an important role in a broad range of engineering applications. In the industry RANS simulations are a common method for predicting turbulent flow. A broad range of RANS turbulence models have been developed over the past decades. For the assessment of complex three-dimensional flow fields Reynolds Stress Transport Models are a better choice than eddy viscosity models, even though their computational cost is higher. A hybrid model that combines the accuracy of the Reynolds Stress Transport Models with the computational speed of the eddy viscosity models could be a valuable tool in the design of structures subjected to complex three-dimensional flows. Therefore the development of such a hybrid model was the objective of this thesis. A literature study on existing RANS turbulence models showed that the Reynolds Stress Transport Models (RSTM) are the most physical but also the computationally most expensive models. The linear eddy viscosity models have a reduced computational cost, but are not capable of predicting flow features that are caused by the Reynolds stress anisotropy, since these models can not account for this anisotropy. The non-linear eddy viscosity models include extra anisotropy by means of higher order terms, but the coefficients in these models are calibrated using simple benchmark test cases, making their applicability to more complex flows uncertain. The Hybrid Turbulence Model (HTM) of Basara combines a RSTM with the formulation of the linear eddy viscosity models to reduce the computation time of the simulation. This hybrid model is also unable to account for Reynolds stress anisotropy just like the linear eddy viscosity models. The development of the Generalised Hybrid Turbulence Model (GHTM) in this thesis, was motivated by this deficiency of the HTM. This novel hybrid model combines a RSTM with the general formulation of the non-linear eddy viscosity models. By using multiple base tensors additional Reynolds stress anisotropy is included. The HTM and the Improved k-epsilon model The GHTM was implemented in OpenFOAM and three test cases were investigated with this new model. The simulations with the GHTM do not reach convergence, except when the full tensor base is considered. The simulations with the Improved k-epsilon model converge and yield more physical results for the U-bend test case, showing a recirculation zone, where the standard k-epsilon model does not predict this flow feature. A mesh refinement study showed that the grid size has no influence on the performance of the GHTM. Also the use of different gradient schemes or under-relaxation did not affect the convergence of the GHTM simulations. To improve the performance of the GHTM different smoothing techniques have been tested, since peaks in the model coefficients seemed to cause the instability of the simulations. The proposed smoothing methods are modifications of the original GHTM and are therefore not useful to improve the performance of the GHTM. A closer look at the properties of the tensors used in the GHTM for statistically two-dimensional flows showed that an error in trace of the mean rate of strain tensor cause the resulting Reynolds stress anisotropy tensor to be incorrect. This problem was solved by constructing more accurate cell face velocities which correspond to the known cell face fluxes. With these new face velocities the GHTM with N=2 converges for the two-dimensional cases, but the linear GHTM still does not converge. A further investigation of the performance of the GHTM for statistically two-dimensional flows showed that in that case the GHTM with N=2 is identical to the background RSTM. This shows that the GHTM with N>1 could only lead to a reduction in computation time for three-dimensional flows.","RANS; hybrid turbulence model; Reynolds stress anisotropy; non-linear eddy viscosity; improved k-epsilon model","en","master thesis","","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","Hydraulic Engineering","",""
"uuid:aa2defb6-f0e4-48f6-ae31-8aa68355831e","http://resolver.tudelft.nl/uuid:aa2defb6-f0e4-48f6-ae31-8aa68355831e","Developing a decision support framework for planning and implementing Bring Your Own Device programme in organizations","Shah, N.K.","Hulstijn, J. (mentor); Van den Berg, J. (mentor); Klevink, A.J. (mentor); van Gils, W. (mentor)","2015","The trend of Bring Your Own Device (BYOD) is creating a new change related to enterprise IT in many organizations. The last years, especially from 2009 -2015 has resulted in proliferation of consumer device market consisting of new mobile devices with features which are very much similar to the features provided by PC workstations. The BYOD programme consisting of mobile devices is creating a change in the way employees use consumer IT to perform work related activities. The use of employee owned personalized devices has many some opportunities such as improving employee productivity, costs to procure hardware and employee satisfaction, It has changed the utilization of employee workplaces due to the facility of mobility. But, at the same time the use of personal mobile devices to perform work activites brings certain challenges such as lack of interoperability with existing IT in the organisation and security risks. Organisations are interested in implementing BYOD programme but they fail to take into consideration certain aspects such as sustainability and effectiveness of the programme. To gain competitive advantage many organization haphazardly implement BYOD programmes for employees without considering the possible consequences and intricacies related to the programme. The research goal is to offer a decision support framework for organizations to plan and implement BYOD programme in organizations. The framework uses strategy ‘opportunities must be greater than risks’ and consists of iterative blocks. The Key performance indicators from the framework guide the decision maker to support a decision towards planning and establishing an effective BYOD programmes.","BYOD; decision support; IT change management; BYOD framework; process improvement","en","master thesis","","","","","","","","2016-11-30","Technology, Policy and Management","ICT","","Management of Technology","",""
"uuid:b441421a-8437-4e4f-b3fd-afb8c1f0b3b1","http://resolver.tudelft.nl/uuid:b441421a-8437-4e4f-b3fd-afb8c1f0b3b1","Improving the performance of the turnaround process using value operations methodology","Samsam, M.","Curran, R. (mentor)","2015","One of the daily operations that a civil airplane goes through is the turnaround of ground handling process or what commonly known as the turnaround process. By improving the performance of the turnaround process, there would be multiple benefits for the airlines and the airports, costs can be saved and more profit can be created due to higher useability of the aircraft. Also the punctuality of the airlines and the airports can be enhanced by decreasing the amount of delays caused by the turnaround process. According to Kenya Airways (KQ), in 2010-2011 the turnaround process is the second largest contributer to delays after network connectivity which accounts for about 28% of their total delays. This proves how significant the performance of the turnaround process might be to the airlines as well as to the airports. Most available literatures on the turnaround process focused on reducing the turnaround time, or improving its punctuality. The novelty of this MSc research is to determine a strategy that improves the performance of the turnaround process based on all its value drivers from the perspective of stakeholders. This has led to the formulation of the research question which is stated as follows: “How can a change in value be measured for relevant stakeholders within turnaround process when evaluating new ideas in improving its performance?” The methodology implemented in approaching this research and ultimately, answering the research question, is to develop a value model of the turnaround process based on value-focused thinking, specifically, value operations methodlogy (VOM). With this value model, the alternative strategies aiming at improving the performance of the turnaround process can be evaluated with respect to the current strategy. Eventually, the strategy that adds as much value for the relevant stakeholders can be determined. The turnarounds performed by KQ at Jomo Kenyatta International airport (JKIA) of Boeing 737-300 from January till June 2012, are used as practical case study in this research. From the results obtained from the calculations, It is recommended to implement lean production system within passengers boarding and disembark and to implement theory of constraints within catering and aircraft cabin cleaning.","turnaround process; value operations methodology; improvement techniques","en","master thesis","","","","","","","","","Aerospace Engineering","ATO","","Air Transport and Aerospace Operations","",""
"uuid:00a7777e-887a-4cdd-9479-a256840716d3","http://resolver.tudelft.nl/uuid:00a7777e-887a-4cdd-9479-a256840716d3","Improving the performance of the turnaround process using value operations methodology","Samsam, M.","Curran, R. (mentor)","2015","One of the daily operations that a civil airplane goes through is the turnaround of ground handling process or what commonly known as the turnaround process. By improving the performance of the turnaround process, there would be multiple benefits for the airlines and the airports, costs can be saved and more profit can be created due to higher useability of the aircraft. Also the punctuality of the airlines and the airports can be enhanced by decreasing the amount of delays caused by the turnaround process. According to Kenya Airways (KQ), in 2010-2011 the turnaround process is the second largest contributer to delays after network connectivity which accounts for about 28% of their total delays. This proves how significant the performance of the turnaround process might be to the airlines as well as to the airports. Most available literatures on the turnaround process focused on reducing the turnaround time, or improving its punctuality. The novelty of this MSc research is to determine a strategy that improves the performance of the turnaround process based on all its value drivers from the perspective of stakeholders. This has led to the formulation of the research question which is stated as follows: “How can a change in value be measured for relevant stakeholders within turnaround process when evaluating new ideas in improving its performance?” The methodology implemented in approaching this research and ultimately, answering the research question, is to develop a value model of the turnaround process based on value-focused thinking, specifically, value operations methodlogy (VOM). With this value model, the alternative strategies aiming at improving the performance of the turnaround process can be evaluated with respect to the current strategy. Eventually, the strategy that adds as much value for the relevant stakeholders can be determined. The turnarounds performed by KQ at Jomo Kenyatta International airport (JKIA) of Boeing 737-300 from January till June 2012, are used as practical case study in this research. From the results obtained from the calculations, It is recommended to implement lean production system within passengers boarding and disembark and to implement theory of constraints within catering and aircraft cabin cleaning.","turnaround process; value operations methodology; improvement techniques","en","master thesis","","","","","","","","","Aerospace Engineering","ATO","","Air Transport and Aerospace Operations","",""
"uuid:a97ad6e6-0d97-4e3c-a9d2-bd3c406e3299","http://resolver.tudelft.nl/uuid:a97ad6e6-0d97-4e3c-a9d2-bd3c406e3299","Improving the Outbound Logistics at KLM Engineering & Maintenance","Porozantzidou, S.","Janssen, M. (mentor); Ludema, M.W. (mentor); Lukszo, Z. (mentor); Kroes, B. (mentor)","2015","Within this report, a process improvement framework is developed and applied in the case of the outbound Logistics process at KLM Engineering & Maintenance. The methodology proposed for the improvement of the process includes a synergy of three different, but related theories: Lean, Six Sigma and Engineering Design. The integration of their critical steps are followed in order to develop improvement recommendations. These are to define the current state and the existing point, measure the process performance in terms of the predefined performance metrics making use of reliable data, develop and analyze improvement techniques. In the context of the analysis phase and due to certain limitations, a specific work scope has been chosen and an algorithmic approach has been applied in order to develop personnel's scheduling scenarios, test and evaluate them in terms of Turnaround Time, Quality and Cost. Next the improvement step includes the proposal of feasible solutions based on the analysis performed. Finally, the control phase helps the continuous improvement of the outbound Logistics through performance management tools","Process Improvement; Lean Six Sigma","en","master thesis","","","","","","","","","Technology, Policy and Management","Technology Policy Management","","Management of Technology","",""
"uuid:c5aaba1a-767f-414a-a19e-6194b0d81289","http://resolver.tudelft.nl/uuid:c5aaba1a-767f-414a-a19e-6194b0d81289","A Maturity Model for Maintenance Departments of Public Organisations: An adaptation of the EFQM model","Puspita Sari, F.","Hermans, M. (mentor); Straub, A. (mentor)","2015","The growing awareness of delivering public services into more costumer-oriented minded triggers the public organisations to manage their assets professionally. Building assets are one of the resources owned by the public organisations that need to be maintained. Maintenance departments are part of the public body that have responsibilities to make sure that the building assets are functioning well and can perform for what it is designed for. The problems arise when there are many buildings that should be managed within different functions and types; such as monumental buildings, schools, offices, etc. creates complexities. Furthermore, the nature of public organisations is different compared to private organisations. Public organisations must follow the law and regulations, facilitating stakeholders’ opinions and politics, and satisfying public. It is questioned whether the maintenance departments are capable to perform the maintenance activities professionally. In order to reveal the capabilities of an organisation a measurement tool is needed. One of the measurement tools that can disclose the professionalism of organisations is a maturity model. With maturity model, an organisation can understand their current maturity level and design their strategy to reach the next level. Furthermore, this is a self-assessment tool that is simple to use. A maturity model can consist of several levels of five, six, or seven, that will depend on the desired function. It is believed that the higher the level, the more professional is the organisation. Several quality management tools are being used by many organisations to enhance their professionalism, for instance the EFQM model. The EFQM model is commonly used in Europe that has components of “enablers” and “results”. By using those components, organisations can value their performances and processes. The main purpose of this research is to develop a maturity model that can measure the capabilities of maintenance departments. By having this tool that specifically designed for building maintenance departments, they can design strategies that fit their goals. Furthermore, to narrow down the research, the subjects of Planned preventive maintenance and Responsive maintenance are involved. To develop a maturity model as an adaptation of the EFQM model, there are several steps to do. Firstly, the literature reviews are conducted. The topics that have to be explored are the types of maturity models, the EFQM model, and the activities of maintenance departments include the Planned preventive maintenance and Responsive maintenance. There are two maturity models that become main references; the Capability Maturity Model (CMM) by Paulk et.al (1993) and the Public Commissioning Maturity Model (PCMM) by Hermans et.al (2014). The main important aspects of the maintenance departments are then summarised and linked to those maturity models and the EFQM enablers. The result is the proposed maturity model. Secondly, the first round interviews are conducted to get opinions and feedbacks from the experts about the proposed maturity model. This will find the relevancy of the key aspects in the model. The results of these interviews are the proposed maturity model and maturity levels. The third step in this research is to design an assessment sheet that can be used to measure the maturity level. This proposed assessment sheets are consisting of 26 questions with five multiple choices for each question. The fourth step is to carry on the second round interviews to explore whether the proposed assessment sheet is relevant to test maintenance departments. The results of the interviews improve the questions and the multiple answers, which are improving the maturity levels. Finally, as final products of this research, a maturity model for maintenance departments and an assessment sheet are formed. The final maturity model consists of five main aspects, 20 sub aspects, and five levels for every main aspects and sub aspects. The final assessment sheet is consisting of 27 questions with five multiple answers per question.","maturity model; EFQM; maintenance; building maintenance; asset management; quality improvement; public sector; public organisation; organisation management; performance measurement; maintenance department; maintenance organisation; construction","en","master thesis","","","","","","","","","Architecture and The Built Environment","Real Estate & Housing","","Design and Construction Management","",""
"uuid:809891f8-ebca-43fd-9996-76d33c2d1ee8","http://resolver.tudelft.nl/uuid:809891f8-ebca-43fd-9996-76d33c2d1ee8","Practical improvement of the growers’ transport operation in a demand-driven floricultural sector","Loenis, B.J.C.","Wiegmans, B. (mentor); Zuidwijk, R. (mentor); Van Lint, J.W.C. (mentor); Duinkerken, M. (mentor); Wiggenraad, P.B.L. (mentor); Timmerman, B. (mentor); Koppes, R. (mentor)","2015","This research investigates the changes which occur in the floricultural sector and how this changing sector affects the transport operation of floricultural growers. By means of demand forecasting and transport scenarios a practical and robust transport solution has been found for the growers.","floricultural sector; transport improvement","en","master thesis","","","","","","","","2020-07-02","Civil Engineering and Geosciences","Transport & Planning","","","",""
"uuid:f24bde6d-df7a-4694-bf57-08c5422966a0","http://resolver.tudelft.nl/uuid:f24bde6d-df7a-4694-bf57-08c5422966a0","Assessment of the consequences of higher safety standards for flood defences along rivers in The Netherlands","Van Zuijlen, J.J.","Kok, M. (mentor); Van Vuren, B.G. (mentor); Mosselman, E. (mentor); Kroekenstoel, D. (mentor)","2015","A large part of the flood defences in The Netherlands does not meet the present safety standards. In 2014 the delta programme has proposed new safety standards, which are based on the flood risk approach. These new safety standards will for a lot of river dikes be stricter than the currently prevailing safety standards. A lot of work has to be done to make sure all the river dikes will meet the new safety standards. The safety level of river dikes can be improved by means of spatial measures, which decrease the hydraulic load on the dikes by increasing the flood conveyance capacity, or by dike improvements, which increase the strength of the dike. The effectiveness of spatial measures has always been assessed in terms of water level reduction and not in terms of reduction of the flood probability. In this research a rapid assessment tool is developed with which the reduction of the flood probability by spatial measures can be assessed. This reduction has been calculated for several types of measures and it is compared with the effectiveness of more traditional dike improvements. The delta programme prescribes a strategy in which the increase of the flood probability because of climate change is counteracted with spatial measures. The difference between the current state of the dikes and the new safety standards should be resolved with dike improvements. This research shows that the flood probability reduction by spatial measures is overestimated. Due to this overestimation more spatial measures will be necessary to counteract climate change than was expected. A new strategy is proposed in which the flood probability for failure mechanism overflow/overtopping is reduced with a combination of dike improvements and spatial measures. The probability of failure for other failure mechanisms (piping, macro stability) is reduced with only dike improvements.","Room for the River; probability of flooding; spatial measures; dike improvements; effectiveness; river dikes; safety standards; delta programme","en","master thesis","","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","Hydraulic Engineering","",""
"uuid:d02725d6-a2ea-43d8-98a7-70d0ea2e7fe3","http://resolver.tudelft.nl/uuid:d02725d6-a2ea-43d8-98a7-70d0ea2e7fe3","Increasing the effectiveness of information distribution in data-driven organizations: Going back to the source: looking for improvement potential in the existing information related structuring at HEINEKEN Brewery Zoeterwoude","De Regt, E.F.G.","Herder, P.M. (mentor); De Haan, A.R.C. (mentor); De Bruijne, M.L.C. (mentor); Schrama, I.J. (mentor)","2015","In today’s information driven-economy, the key for manufacturing organizations like HEINEKEN Brewery Zoeterwoude to become and remain competitive lies in their capacity to acquire sound, relevant and timely information, as well as in ability to learn from the acquired information. The latter is believed to be linked to the extent in which the information is created and distributed in a structured way. In this research a progressive case-study is conducted as to assess the improvement potential that lies in the current structuring mechanisms that are in place.","Information distribution; Organizational structuring; Performance Improvement Methodologies; Case study","en","master thesis","","","","","","","","","Technology, Policy and Management","Energy & Industry","","Systems Engineering, Policy Analysis and Management","",""
"uuid:5b0f0986-cdfc-46e7-9238-2748f07c83cf","http://resolver.tudelft.nl/uuid:5b0f0986-cdfc-46e7-9238-2748f07c83cf","Improving Operational Efficiency of Discrete Production Processes in Large Manufacturing Organizations","Vijfhuizen, F.W.","Tavasszy, L. (mentor); Van Duin, R. (mentor); Van der Voort, H. (mentor); Derksen, T. (mentor); Winter, B. (mentor)","2014","In the present time large manufacturing organizations operate on a global scale and thereby form an extremely competitive market. Far going globalization makes markets highly competitive, putting the pressure on these organizations to be more innovative and improve the efficiency of its production processes in order to lower overall costs. These goals are aimed to be achieved by introducing elaborate continuous improvement strategies. Implementing such strategies however has far going implications on organizations, in terms of performance management, working culture, and organizational structure. Companies have often implemented one or more continuous improvement strategies. While these strategies promise to result in a perfect process, in practice this is not the case. Problems form when there is a significant gap between company goals and the actual operational performance. In that case a situation arises where not ideal operational performance can be caused by logistical malfunctions, a continuous improvement strategy that is not performing optimal, friction in the organizational structure, or even a combination of all. It is therefore difficult for organizations to identify what causes a non-optimal operational performance, given the complexity of the described environment. The objective of this research is to improve this operational performance by overcoming this knowledge gap. The following general research question is formulated to overcome this knowledge gap: How can large manufacturing companies identify causes of discrete production processes not performing in line with company goals? In this research a three step approach is used. The first step is to zoom out from the logistic process and analyze the characteristics of the organization and the used continuous improvement strategy. By comparing the organizational characteristics with academic literature, strengths and weaknesses of the organization can be identified, and also the corresponding opportunities and threats. The used continuous improvement strategy is analyzed, for it is never flawless. Methodologies keep evolving and improving, and new theories are being developed and tested every day. Looking critical at the used improvement strategy will provide insight in missed opportunities and the importance of certain focal points in the organization. The second step is linking these findings to an analysis of the logistical process. It is important to determine how the operational efficiency is defined and how it is measured. Step one might provide a different perspective for analysis or focal points. In this second step improvement projects can be selected and defined on an operational level. Step three consists of performing the selected improvement projects. It is important to incorporate the findings of step one into these projects. This way the findings in academic theory can be evaluated by testing in practice. This evaluation provides concrete feedback on the found causes of non-optimal performance of the production line. Combining these three steps will provide (i) a thorough analysis of the organization, (ii) identifications of barriers and enablers in the organization, and (iii) will present opportunities to improve the operational efficiency beyond the knowledge that is present in the organization. With the gained knowledge, step one can be repeated in order to create an iterative process for continuous improvement. This approach is conducted and tested at the Heineken brewery in Zoeterwoude, the Netherlands. During a six month period, a real life case study is performed at production line 81, a bottling line that packs beer into cases for export. First it is shown that it is important to take into account the different perspectives between management and operators. In order to improve the production line in a structural way it is essential to communicate with operators in such a way it aligns with their goals. Next to this it is found that there are opportunities in using the tools presented in the Theory of Constraints. Based on a bottleneck analysis, it is shown that the losses with the biggest impact on the total production line are found downstream of the designed bottleneck, signaling a hidden bottleneck. It is shown that the output performance can be significantly improved by diminishing the amount of breakdown in the machines downstream of this hidden bottleneck. The performance indicator “Operational Performance Indicator No Order No Activity” has increased with 6.34 percentage points and the deviation of this indicator has diminished with 1.63 percentage points. If this major increase can be maintained in the future, this improvement could save the organization 115,402 on a yearly basis in non-cash savings. This shows that using the Continuous Improvement strategy Total Productive Management is an effective tool for Heineken to structure its continuous improvement efforts. The foremost general recommendation in respect to strengthening the findings in this research is performing more similar case studies. A case study at a comparable manufacturing organization is necessary to compare results and draw conclusions on the extent to which the findings can be generalized. The expectation is that the found principal-agent dynamic at Heineken is strongly comparable to other large manufacturing organizations. If that is the case, this can be a highly interesting addition to the theory on organizational structures. For Heineken from a logistical point of view it is important to keep working on the newly identified bottlenecks, the Packer and Multipacker machines. Every minute won on these machines can directly benefit the operational efficiency of the entire line. These findings can also be applied at the other production lines in the brewery as well. This horizontal expansion can provide new insights into the general mechanisms of the entire brewery. For the long term it is recommended to involve the proposed rule of thumb in the monthly meeting between a rayon manager and the installation manager. Last, if Heineken wants to cope with the found principal-agent dilemma, a thorough behavioral change is required in the entire organization. It is recommended to implement a form of change management, for example the methodology founded by Kotter (1996).","Continuous Improvement; Total Productive Management; Theory of Constraints; Large Manufacturing Organizations; Real Life Case Study","en","master thesis","","","","","","","","2019-10-09","Technology, Policy and Management","Transport and Logistics","","Systems Engineering, Policy Analysis and Management","",""
"uuid:e6a3d9e9-0991-4a8e-b774-d3e2135b168c","http://resolver.tudelft.nl/uuid:e6a3d9e9-0991-4a8e-b774-d3e2135b168c","Processing Analysis & Market Analysis on Company X Bentonite","Van der Waal, K.T.","Van Paassen, L.A. (mentor); Benndorf, J. (mentor)","2014","Bentonite is a clay that is used in many industrial applications. Company X required an investigation on the bentonite that is mined by Company Y. Currently Company X produces cat litter only from her bentonite, but other applications might be of economical interest to the company. After scoping down to 4 applications other than cat litter (drilling mud, foundry sand, soil improvement and bleaching earth), the possibility of processing bentonite to gain the physical properties required by these 4 applications was investigated. The information needed for this investigation is mostly gathered from scientific reports based on the processing of Country A bentonites. From the results from earlier researches on Country A bentonites it is concluded that Country A bentonites can be made suitable for all 4 applications through several processing steps. The second part of the report focuses on the market possibilities of the 5 applications (the cat litter application included). It is found that the bleaching earth and the drilling mud market are most likely to be fit for a market entry. It is also concluded that the bleaching earth application is of most economical interest when looked at the net present value of the investment after 15 years. The drilling mud application is of most economical interest when looked at the internal rate of investment. The soil improvement application requires almost no change in processing steps when compared to the production of cat litter and might therefore be of economical interest to Company X. There is a risk of turning up with a negative net present value (after 15 years) when Company X would choose to invest in the drilling mud, foundry sand and bleaching earth application. Therefore the final conclusion is that Company X should do a deeper investigation in the soil improvement application, since it is found that the economic potential is very high for this application. When this seems to be an unrealistic or economical uninteresting investment, Company X should investigate a further expansion of cat litter export.","Bentonite; characterisation; drilling fluid; foundry sand; soil improvement; bleaching earth; processing analysis; market analysis","en","bachelor thesis","","","","","","","","2019-10-09","Civil Engineering and Geosciences","Geoscience & Engineering","","Resource Engineering","",""
"uuid:20aeb081-0dfc-42fc-a31e-ce1dddc41804","http://resolver.tudelft.nl/uuid:20aeb081-0dfc-42fc-a31e-ce1dddc41804","Characterisation and applications of bentonite","Ooms, M.C.","Van Paassen, L.A. (mentor); Benndorf, J. (mentor)","2014","A research was undertaken to find the suitability of Turkish calcium bentonite from the mines of a Company. Four samples of bentonite mines in the {\""U}nye region are researched, the M1, M2, M3 and M4 mine. The suitability of drilling fluid, foundry sand, soil improvement and bleaching earth applications is found through research on the characteristics of bentonite and by testing the specifications of the chosen applications. In this research the following bentonite characteristics are determined: cation exchange capacity, chemical composition, free swelling capacity, liquid limit, methylene blue adsorption, moisture content, pH, plastic viscosity, specific surface, swelling index and yield point. Characteristics are tested according the associated methods of the specifications. For drilling fluid, the API 13A and OCMA Standard is used. The IS 12446:2007 by the Bureau of Indian Standard is used for foundry sand. For the applications of soil improvement and bleaching earth international standards cannot be found. For this reason a specification of the European Commission on soil improvement is used. Recommended ranges found in literature are used in testing the suitability of bentonite for bleaching earth. The results of this research show a suitable outcome for the use of drilling fluid. The M1 and M4 sample are API qualified and the M3 sample is conform the OCMA Standard. For foundry sand the bentonite samples are not suitable, all samples are not performing good enough on water absorption and cation exchange. Due to found traces of lead contamination in the M1, M3 and M4 bentonite samples, but these samples are still suitable in soil improvement according to the specifications of the European Commission. However, in the M2 sample there is no trace found of any heavy metal contamination and is, except the low nutrient content, suitable for soil improvement. All samples are very close to the recommended ranges found in literature for bleaching earth, therefore all samples are suitable for the application.","Bentonite; Characterisation; Drilling Fluid; Foundry Sand; Soil Improvement; Bleaching Earth","en","bachelor thesis","","","","","","","","2019-06-24","Civil Engineering and Geosciences","Geoscience & Engineering","","Geo-engineering","",""
"uuid:2c7e4e45-a38d-4f69-817e-6367d953a662","http://resolver.tudelft.nl/uuid:2c7e4e45-a38d-4f69-817e-6367d953a662","Improving Oasis Beach: Creating a sustainable and attractive beach around hotel Oasis in Varadero Cuba","Vrolijk, E.F.; Poelhekke, L.; Schlepers, M.H.; De Boer, G.G.","","2014","In the North of Cuba, the Oasis beach area is situated. The beach suffers from structural erosion and earlier measures to deal with this have not succeeded. In this project, a solution is offered to reach two goals: foremost, a beach improvement to the Oasis beach sector and second, a halt to the structural erosion in the sector in order to maintain the beach improvement. These goals are strongly linked to one another and contain several research questions to be able to find suitable solutions. A vast analysis on the area has been made. It becomes clear in the project that these impacts are decisive in the erosion that takes place, as natural beach recovery is limitedly possible. An important finding during the analysis is that there is no significant sediment transport in the Oasis beach sector during normal conditions. However, the steep bathymetry and the re-occurrence of cold fronts and hurricanes induce large cross-shore transport and sediment is extracted from the system, leaving the Oasis beach sector with a structural erosion problem. The solution of the problem would have to be a combination of hard and soft measurements. Three alternatives were created, plus a base alternative. The base alternative consists of the demolition of the existing structures and a nourishment. The three alternatives are respectively a ‘Perched beach’, ‘Emerged breakwaters’ and ‘Wooden L-shaped piers’. All alternatives were simulated with the use of Delft3D and XBeach. A Multi Criteria Analysis (MCA) was carried out to evaluate the alternatives. The most important criteria in this are the protection against erosion and spatial quality. The MCA, in combination with the estimated accompanying costs, resulted in a final solution proposal, being the perched beach. Although scoring high in general, a few adjustments are made to the design. An addition is made by introducing a sill to the alternative. The sill will take over the function of supporting the beach and enables a smaller beach nourishment and a better controllable beach profile, as it is build closer to shore. Furthermore, the height of the breakwater is increased in order to decrease the amount of necessary maintenance. The proposition of the solution comes with an indication of planning and costs. The construction time is estimated to be 343 days. Construction costs are calculated to be $ 6,970,175.70 CUP, including the costs for the initial nourishment and the demolition of existing structures.","beach improvement; Cuba; Delft3D; XBeach; nourishment","en","student report","","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:f3ac1df2-81ca-470e-a17e-0edb4d42e122","http://resolver.tudelft.nl/uuid:f3ac1df2-81ca-470e-a17e-0edb4d42e122","Towards the introduction of fit-for-purpose project management: An explorative case study on implementing central planning and risk log","Teerlink, T.","Verbraeck, A. (mentor); Mooi, H.G. (mentor); Bosch-rekveldt, M.G.C. (mentor); Janssen, R. (mentor); Leenheer, D. (mentor)","2013","","Central Planning; Enterprise resource planning; Improvement program; Key Performance Indicators; Project Execution; Project Management; Risk Log; Work Break-down Structure","en","master thesis","","","","","","","","","Civil Engineering and Geosciences","Structural Engineering","","Construction Management and Engineering","",""
"uuid:e7866a4a-62fe-4a6f-bb22-2e4c53082be3","http://resolver.tudelft.nl/uuid:e7866a4a-62fe-4a6f-bb22-2e4c53082be3","Project Scheduling: The Impact of Instance Structure on Heuristic Performance","De Nijs, F.","Klos, T.B. (mentor)","2013","Many meta-heuristic approaches have been suggested for or applied to the Resource Constrained Project Scheduling Problem (RCPSP). The existence of a number of highly accessible standard benchmark sets has promoted a research focus on finding anything that improves average solution quality, without investigating what effect is responsible for the improvement, or what is responsible for holding us back. This work focuses instead on understanding the original constructive Schedule Generation heuristics and their interaction with a well known but poorly understood post-processing step called Forward-Backward Improvement that is known to almost always improve any generated RCPSP schedule. We follow an empirical investigation methodology by first observing the effect of FBI on a large generated testset. Based on these observations we explain why FBI works by means of hypotheses on its operation. These hypotheses generate predictions that we subsequently successfully test in a second round of experiments. In the process we are able to propose a novel priority rule heuristic based on the principles of FBI. We find that this new rule outperforms the current best priority rule heuristic.","Resource Constrained Project Scheduling; Priority Rule Heuristics; Forward-Backward Improvement","en","master thesis","","","","","","","","2013-11-12","Electrical Engineering, Mathematics and Computer Science","Software Technology","","Algorithmics","",""
"uuid:2f1d9ae2-7e26-4ac7-97ba-3cd9a185b33d","http://resolver.tudelft.nl/uuid:2f1d9ae2-7e26-4ac7-97ba-3cd9a185b33d","Sustainability Maturity Model: The Pilot Sustainability Agenda-Setting in Business","Wortel, M.C.","Korevaar, G. (mentor); Quist, J.N. (mentor)","2013","The Master’s programme Industrial Ecology is jointly organised by Leiden University and Delft University of Technology. Sustainable development is a young, developing field in which many standards, certificates, and initiatives are spawning. Companies are expected to work on sustainable development by its customers, investors, and society in general. It can be difficult to do this effectively because the field is cluttered and can be confusing. The Sustainability Maturity Model (SMM) presents an overview of sustainability topics and helps companies prioritise between them. The SMM was developed in a collaboration of Ecomatters (a consultancy firm in sustainability and regulatory affairs) and the master programme Industrial Ecology of Delft University of Technology and Leiden University to assist companies with defining their internal sustainability agenda. The SMM does that by supporting companies through providing an overview of the sustainability topics they are expected to manage, and prioritising them. The SMM consists of a list of 29 sustainability topics based on established standards, and is combined with a 5-step level system, that is based on the Capability Maturity Model. This project was commissioned by Ecomatters and its main goal was to operationalise the SMM and execute a pilot with potential users to assess the SMM’s viability as a consultancy product. The second goal was to relate the SMM to current academic literature. The SMM relates to current academic literature. It is based on the Triple Bottom Line (TBL) of ‘People, Planet, Profit’ developed by John Elkington. The TBL is the most widely accepted approach to sustainable development (Stubbs and Cocklin 2008). Sustainable development was defined by the World Council on Environment and Development as meeting the needs of the present without compromising the needs of future generations (WCED 1987). The topic list of the SMM is based on established frameworks: the European Eco-Management and Audit Scheme, the Dow Jones Sustainability Index, ISO 26000 on Social Responsibility, and Social Accountability’s SA8000. Next to topics from these frameworks, the SMM includes the topic Future Business Activities which is based on the widely used framework Transition Management that was developed to incorporate sustainability trends into the business strategy (Loorbach, van Bakel et al. 2010). The topic ‘Sustainability Awareness’ was added because it is recognised as an important factor for the sustainability performance of a company (McEwen and Schmidt 2007). Since the issues companies “are expected to manage” is an important theme in the SMM, it is important to understand the role business is expected to assume in sustainable development. Business is expected to address sustainability issues through developing sustainable products and processes (Hall, Daneke et al. 2010, Porter and Kramer 2011). Sustainable products and processes are expected to play an important role, but the issues in sustainable development are too complex to be tackled by single organisations (Loorbach, van Bakel et al. 2010). Therefore, business needs to form coalitions with different types of organisations (SustainAbility 2004). The level system of the SMM includes requirements regarding both expectations. The lower levels have to do with the internal processes and the highest level covers collaboration with other organisations. The levels are based on the Capability Maturity Model (Paulk, Curtis et al. 1993) that originated from software development and is now widely used as a basis for managing business processes in a stepwise approach (de Bruin, Rosemann et al. 2005). The level system follows the best practices for maturity models defined by De Bruin et al. (2005). The SMM does not present any final score on sustainability. For individual actors such as companies, ‘being sustainable’ is not possible since sustainability is a property of a system, not of an individual component (Nikolic 2009). The SMM does not prescribe a minimum level anywhere. Individual actors cannot be obliged to not perform unsustainable actions when they intend no harm and when the influence of those actions is too small to change anything (Sinnott-Armstrong 2010). Instead, companies are encouraged to define their own priorities and decide how strongly they want to perform on each individual topic. The SMM was reviewed in four steps: aligning the topics from the different standards, supplementing the topic list with findings from academic literature, fitting the level system to the CMM and the situation, and testing its operationalisation in a pilot. After the review, the SMM was operationalised by creating a leaflet that introduces potential participants to the pilot, an one-page introduction to the workshop, a presentation to guide the workshop, a set of forms to guide the consultant through the workshop and make quick notes on, and a format for the feedback report the companies received after the pilot. Eight companies in the chemical, food and energy industries with revenues of 176 million to 3,7 billion participated in the pilot. They were represented by one or two of their managers in sustainability (six companies) or communications (two companies). During the 3-hour workshops, the topics in the Sustainability Maturity Model were discussed one by one. After the workshops had been held, the participants received feedback reports that analysed their results as well as the average results of the entire group. The gap analysis and recommendations about topics to work on formed the core of these reports. The participants were phoned to discuss the value of this feedback and how it could be used within the company. From the perspective of the participants, the workshops and feedback reports were useful. The participants appreciated the broadness of the topics list, the structured approach, the face to face interaction, and the emphasis on prioritising. Applying the same management framework to each topic and being selective about the topics to work on was seen as a novel approach. Most of the participants felt that their feedback report provided useful input for determining the focus of their strategy. The SMM was tested with medium and larger sized companies and found suitable when the participants were open to the approach. According to an industry expert, it could be useful for smaller companies as well. The usefulness of the model depends on how open the company is to its approach of prioritising and advancing within a topic list. Even though literature research and the reactions from the participants show that the SMM is suitable for its intended use, several practical improvements could increase the usefulness of the SMM process further, the main recommendations being: conducting the workshop with multiple people to increase data quality, preparing them for the workshop better to save time during the workshop, and providing more detail on the requirements per topic in the feedback so it is easier for participants to define follow up actions. By doing workshops with a large group of similar companies the benchmarking function of the SMM can be improved, which is a feature the participants of the pilot asked for. Before this project, the concept of the SMM was defined, but it was not ready for use in a consultancy context yet. This project has strengthened the link between the SMM and current literature on sustainable development in the business context, has made the SMM usable, and the first pilot was conducted. The pilot was the first presentation of the SMM to potential users, and their predominantly positive reactions have shown that the SMM is now ready for use in a consultancy context. The SMM and the work done for it during this project are property of Ecomatters. This report contains the part of the information that was selected to be publicly available. Company results have been aggregated and anonymised, and parts of the analysis and description of the model have been omitted in this report to guarantee the confidentiality of this information. Parts of the analysis and description of the model were retained to serve as examples of the further development of the SMM and the results of that process.","sustainability; sustainable; agenda; priority; business; pilot; model; consultancy; manage; ISO 14001; SA 8000; Capability Maturity Model; company; EMAS; DJSI; ISO 26000; standard; guideline; people; planet; profit; GRI; topic; level; operationalise; organisational capability; management; maturity; capability; improvement; test; interview; feedback; workshop; benchmark; comparison; ambition; supply chain; life cycle; strategy; business strategy; partnership; collaboration; triple bottom line; prioritise; compare; collaborate; consult; consultant; companies; businesses; improve; capable; mature","en","master thesis","","","","","","","Campus only","","Technology, Policy and Management","Energy & Industry","","Industrial Ecology","",""
"uuid:b5abb48e-963c-4599-b737-b3b7a4a0874f","http://resolver.tudelft.nl/uuid:b5abb48e-963c-4599-b737-b3b7a4a0874f","Designing New Handling and Sorting Equipment","Thissen, J.J.","Prins, J.F. (mentor); Kooijman, A. (mentor); Vos, M. (mentor)","2013","The design of new handling and sorting equipment, together with the corresponding procedure. The equipment is designed for the (soda-) can industry. It has besides ergonomic advantages for the employees also quality improvements.","consistency of quality; ergonomically improvements; separator sheet sortation","en","master thesis","","","","","","","Campus only","2014-08-28","Industrial Design Engineering","Design Engineering","","Master of Science Integrated Product Design","",""
"uuid:671588d6-bafb-4363-9085-058d1844fb0e","http://resolver.tudelft.nl/uuid:671588d6-bafb-4363-9085-058d1844fb0e","A Strategic Case","Van Aken, N.","Buijs, J.A. (mentor); Bakker-Wu, S. (mentor); Gefken, W. (mentor); Noriega, D. (mentor)","2013","This graduation project is performed at Kofferfabriek Gefken, a small company that designs, produces and sells tailormade cases. More or less starting from scratch, a thorough internal and external analysis was performed, as well as two constructive sessions with the management. A new mission statement was formulated, and by using SWOT techniques and Brand-driven Innovation theory ( Roscam-Abbing, E.), a tactical improvement plan was developed. Concluding with a concrete product as an example of the wanted results, this thesis is a solid foundation for future developments inside Kofferfabriek Gefken.","Innovation; Tactical Improvement Plan; Strategy; Design","en","master thesis","","","","","","","Campus only","2014-03-27","Industrial Design Engineering","Product Innovation Management","","Master of Science Strategic Product Design","",""
"uuid:1400389f-c643-4d44-af41-580c7209e7bb","http://resolver.tudelft.nl/uuid:1400389f-c643-4d44-af41-580c7209e7bb","Utilization of Rice husk ash in GeoTechnology: Applicability and effect of the burning conditions","Pham, P.V.","Van Tol, A.F. (mentor); Van Paassen, L.A. (mentor); Van der Star, W. (mentor); Ye, G. (mentor)","2012","Rice husk ash is an attractive pozzolan. Due to its low cost and high activity it has a promising perspective in sustainable construction. In combination with lime, its effect in soil improvement can be equal to cement treatment but its production process consumes much less energy. The main component of the rice husk ash is silica, which is the element that governs the reactivity of the ash. A delicate burning process is required to eliminate the organic components in the rice husk but keep the silica to be amorphous so that a highly reactive rice husk ash can be obtained. A too high temperature would transform amorphous silica to crystalline silica, which would reduce the reactivity. The suggested burning process in literature is 2 hours at 500oC. However, due to the exothermic property of the burning rice husk it is difficult to control the exact burning temperature, hence there is still a possibility that the carbon and the crystallized silica are present and hinder the activity of the rice husk ash. Based on the silica state and the carbon content, the rice husk ash is classified in three types: C-RHA which is collected from a quick and open-air burning and contains a large amount of carbon; Cr-RHA which is collected form slow burning at above 600oC and contains a large amount of crystallized silica; and A-RHA which is collected from the suggested burning process which is 500oC in 2 hours and is considered to be the most active. The activity of these three types of rice husk ash and their effect in soil improvement were tested. As expected, the higher reactivity of the A-RHA compared with the Cr-RHA confirmed the capability of these burning conditions. Surprisingly, the C-RHA appeared to be the most reactive and its effect to the soil was also the most positive despite of the large carbon content and the detected crystalline silica. The high reactivity of the C-RHA derives that there is a hierarchy of the solubility depending on the burning duration so that although all the three types of ash were mainly amorphous, the C-RHA is the most soluble. From the experiments, the role of the carbon was seen in only the term of quantity as it reduce the proportion of the silica, but might it have any support to the reactivity of the material in those experiments then it needs more investigation. The results of the treated soil showed that the rice husk ash need the lime to be activated, but then it helped to enlarge the possitive effect of the lime. The immediate effect of the additives to the plasiticity of the soil were seen to be the results of the lime only, but the long-term effect of the strength and the compression of the soil were seen to be the results of the combination between rice husk ash and lime. Especially in the case of C-RHA, it can reduce half the amount of lime in the case of 6% lime mixing to give similar undrained shear strength which was about 410 kPa. Because the carbon is not a serious harmful factor in the soil, and the soil can also take the advantage of the firmness of the quartz, so between the two cases, the rice husk ash with large carbon content and also considerable amount of quartz but higher reactivity, and the rice husk ash which is almost purely amorphous silica but less reactive, the former is the preferred for the soil improvement purpose.","rice husk ash; soil improvement; burning conditions; pozzlan; pozzolanic activity; reactive silica","en","master thesis","","","","","","","","","Civil Engineering and Geosciences","Geoscience & Engineering","","","",""
"uuid:e068d5a0-07b5-4981-bf9a-027465387dea","http://resolver.tudelft.nl/uuid:e068d5a0-07b5-4981-bf9a-027465387dea","Applying Lean Six Sigma in a multi-department environment: Reducing the rejection of steel slabs within Tata Steel IJmuiden","Van den Berg, R.","Herder, P. (mentor); Lukszo, Z. (mentor); De Bruijne, M. (mentor); Brockhoff, J. (mentor)","2012","This report presents the results of a thesis research project executed at Tata Steel IJmuiden at the technical quality department of the Basic Oxygen Steel plant. This department wanted to reduce the rejection of their produced steel slabs within the internal supply chain of Tata Steel. For this project the Basic Oxygen Steel plant wanted to use the quality improvement method Six Sigma. The project involved several departments because the problem occurs within the internal supply chain of Tata Steel IJmuiden. Therefore this research is interested in a quality improvement method which can be applied in a multi-department setting, whereby different departments have their own goals, own working methods and incentives which may be conflicting. This lead to the main research question: How to improve the performance of an organization within the process industry by implementing improvement measures in different sub-systems with their individual objects and working methods?","Lean Six Sigma; Quality improvement method; Organization structures","en","master thesis","","","","","","","Campus only","2013-03-13","Technology, Policy and Management","Infrastructure Systems & Services","","Energie & Industrie","",""
"uuid:ca59ce6d-ab40-485d-a1a4-b659cd537554","http://resolver.tudelft.nl/uuid:ca59ce6d-ab40-485d-a1a4-b659cd537554","Effect of TIG-dressing on fatigue strength and weld toe geometry of butt welded connections in high strength steel","Van Es, S.H.J.","Bijlaard, F.S.K. (mentor); Kolstein, M.H. (mentor); Pijpers, R.J.M. (mentor); Hendriks, M.A.N. (mentor); Houben, L.J.M. (mentor)","2012","When high strength steels are applicated in dynamically loaded structures, fatigue problems can arise. In most current design codes, the fatigue strength of high strength steels is either not discussed or determined as similar to mild steels. This assumption can be related to the dominance of the crack propagation life during in the total fatigue life when considering welded connections. Weld improvements can increase the length of the crack initiation life and thus increase the total fatigue life and may lead to a difference in fatigue strength between high strength steel and mild steels. This study focuses on the the effects of TIG-dressing on the weld toe geometry and the fatigue strength of TIG-dressed specimens. First a literature study is presented which summarizes earlier researches into the effect of TIG-dressing on fatigue strength and the behaviour of high strength steel in fatigue conditions, both in an as welded situation as after TIG-dressing. The weld toe geometry before and after TIG-dressing is determined. This leads to a extensive data set containing the geometry of the complete weld. The weld toe is then described with the aid of four parameters: weld toe radius, weld toe angle, weld height and undercut. Any influence of the static strength of the material, or any differences between rolled and cast steel are investigated. A comparison is made between the as welded specimens and TIG-dressed specimens. This changed geometry has been coupled to a changed fatigue strength with the aid of the notch stress approach. FEM analyses of the weld toe, based on measured geometries, have been carried out to determine stress concentration factors. Adjustments of the fatigue strength to account for loading mode, thickness, residual stress and mean stress have been derived from literature. A small reduction in residual stress, caused by the TIG-dressing procedure, has also been derived from literature. Fatigue tests have been carried out on 24 specimens ranging from S460 to S1100, made from both cast and rolled steels. The specimens are also adjusted for loading mode, thickness, residual stress and mean stress and compared with the developed model and a larger dataset of comparable as welded specimens. Due to the relatively small number of specimens per steel grade, a reliable quantitative fatigue strength improvement cannot be specified. A extensive qualitative analysis gives insight in the overall trends. From all used plates, hardness measurements are available, which have not been thoroughly analyzed. During the fatigue tests, crack dimensions have been determined during the crack propagation life. These measurements also have not been analyzed. Both data sets are added in annexes and are digitally available at the author or one of the members of the graduation committee.","TIG-dressing; geometry; tests; fatigue; radius; angle; improvement; butt; weld; high; strength; steel","en","master thesis","","","","","","","","","Civil Engineering and Geosciences","Structural Engineering","","Steel Structures","",""
"uuid:a726f55d-ed87-4524-af53-f3b7d8b9fe69","http://resolver.tudelft.nl/uuid:a726f55d-ed87-4524-af53-f3b7d8b9fe69","Achieving excellence in the aerospace industry: The development of a quality improvement method for innovative engineer-to-order processes at Fokker Services","De Boer, M.A.","Herder, P.M. (mentor); Lukszo, Z. (mentor); De Bruijne, M.L.C. (mentor)","2011","","Six Sigma; engineer-to-order; production processes; quality improvement; aerospace industry","en","master thesis","","","","","","","Campus only","","Technology, Policy and Management","Energy & Industry","","Management of Technology","",""
"uuid:16cec059-45b2-4946-8291-b92b72db8913","http://resolver.tudelft.nl/uuid:16cec059-45b2-4946-8291-b92b72db8913","On 3D Stacked IC Yield Improvement and 3D-DfT Test Architecture","Verbree, J.","Marinissen, E.J. (mentor); Hamdioui, S. (mentor)","2011","Three-dimensional stacked ICs (3D-SICs) based on Through-Silicon Vias (TSVs) is an emerging technology. It provides heterogeneous integration, higher performance and bandwidth, and lower power consumption. However, 3D-SICs suffer from lower compound yield, especially those based on Wafer-to-Wafer (W2W) stacking. In addition, testability of such devices is still in its infancy stage. This thesis addresses these two challenges. To improve the compound yield of W2W 3D-SICs, a technique known as wafer matching will be used. It defines the best matching of top and bottom wafers from repositories of pre-tested wafers. The simulation results show that the compound-yield increase depends on (1) the number of stack tiers, (2) the number of dies per wafer, (3) the die yield, and (4) the repository size. Moreover, they demonstrate that, for realistic cases, relative yield increases of 0.5% to 10% can be achieved. The thesis also proposes a three-dimensional Design-for-Test (3D-DfT) architecture that solves the testability issue of of 3D-SICs. The architecture is based on a modular approach, in which the various dies, their embedded IP cores, TSV-based interconnect, and external I/O can be tested as separate units, before and/or after bonding. Furthermore, the architecture leverages existing 2D DfT already present in the design, and adds a die-level wrapper based on IEEE Std 1500 augmented with additional features in order to be able to deals with 3D-SIC challenges (e.g., to transport signals up and down through the stack). The architecture is implemented and the simulation results show that it provides the flexibility and the modularity is realized at the cost of less than 0.1% area overhead when considering large industrial chips. The architecture could serve as a basis for further standardization of DfT for 3D-SICs.","3D-DfT; Test Architecture; Yield improvement; 3D-SIC; TSV; Wafer matching","en","master thesis","","","","","","","","2011-09-16","Electrical Engineering, Mathematics and Computer Science","Microelectronics & Computer Engineering","","Computer Engineering","",""
"uuid:989451eb-85ad-44b2-97ce-237655ea0748","http://resolver.tudelft.nl/uuid:989451eb-85ad-44b2-97ce-237655ea0748","Retail Performance Scan+: An innovative service for improving the commercial performances in retail","Ho, E.S.H.","Christiaans, H.H.C.M. (mentor); Simonse, L.W.L. (mentor)","2011","","Retailscan; Retail; Industrial Design; Service design; Performance Improvement","en","master thesis","","","","","","","Campus only","","Industrial Design Engineering","Product Innovation Management","","Master of Science Strategic Product Design","",""
"uuid:4dabc07e-47c5-43f4-954e-48bd9f075b10","http://resolver.tudelft.nl/uuid:4dabc07e-47c5-43f4-954e-48bd9f075b10","Integration of Six Sigma and Achieving Competitive Excellence: A case study at Ethiopian Airlines","Nigatu, T.A.","Lukszo, Z. (mentor); Scholten, V.E. (mentor)","2011","Currently organizations are investing large sums of money, time and knowledge to stay competitive and profitable. Driven by strong competition and increasing operational costs, the global aviation industry is under paramount pressure to strengthen operational excellence and improve profitability. Airlines are heavily investing in the means to improve productivity and reduce variation in the maintenance, repair and services processes. Both the well-established and new entrees to the aviation industry need to develop and implement well-developed and proofed quality management system to stay competitive and lead the industry and/or expand to new market segments. A quality management system will help Airlines to meet their customers’ expectation through improved products and services. Ethiopian Airlines (EAL) is facing fierce market competition from European and Middle East airlines such as KLM, Turkish Airlines, Emirates, Qatar and Fly Dubai. EAL implemented Achieving Competitive Excellence (ACE) to improve its performance and stay competitive in the market. ACE is a custom-made system developed by United Technology Cooperation (UTC) and yet not proved useful in other organizations. Its implementation highly depends on organizational culture, company resource and existing quality management system. To understand and exploit advantage of ACE, a detailed investigation of its philosophy, tools, techniques, critical success factors, pre-conditions and (dis-)advantages is established. Furthermore, a detailed comparison and potential benefits of its integration with the well-established quality improvement system Six Sigma, are demonstrated. Six Sigma is a business process improvement approach that seeks to find and eliminate causes of defects and errors, reduce cycle time and cost of operations, improve productivity to meet customer expectations, and achieve higher asset utilization and returns. Six Sigma employs a project-based method that uses statistical and non-statistical tools and techniques to remove process variation and improve process performance and capability. Furthermore, Six Sigma is a data-driven, result oriented and uses well-trained improvement specialists and top-down approach to execute the improvement processes. To thoroughly understand the logical reasoning behind ACE and to improve the rate of ACE implementation, resemblances between ACE and Six Sigma and benefits of integrating of ACE and Six Sigma on organization performance; the main research question is formulated as: “How can Six Sigma be integrated with Achieving Competitive Excellence (ACE) quality management system to reduce products and services variance, and to improve the performance of an organization?” An extensive literature review on business performance, Six Sigma and ACE is carried out to establish a theoretical framework for this research project. The literature finding of ACE is demonstrated with an exploratory case study at EAL. A detailed insight to the practical challenges and barriers of ACE implementation are presented. The findings of the literature review are crafted against the case study in corporation with ACE experts to formulate firm conclusions and recommendations. Organizations must thoroughly identify their strategy, structure and culture, institutional forces, resources and performance measurement system before embarking on ACE and Six Sigma integration. Top management involvement, commitment and leadership is critical for successful integration. A top-down approach is suggested for project prioritization and selection in an integrated Six Sigma and ACE environment. This increases the involvement of top management in continuous improvement processes. Top management translates organization’s strategies to goals and objectives to meet customers’ expectation and remove barriers and obstacles to enhance efficiency and effectiveness of continues improvement programs. Furthermore, top-down approach facilitates integration of stakeholders’ issues; sustained profit, low operational cost, sustainable annual growth and usage of “voice of customer” (VOC) as an input to project selection process. The introduction of Design for Six Sigma (DFSS) in design and development of new products and services leads to sustainable business operation in a dynamic market environment by delivering high quality products and services to their customers with at lower-cost. DFSS benefits ACE with by reducing product development cycle and high production efficiency and effectiveness. Six Sigma’s tools like design of experiment (DOE), analysis of variance (ANOVA), linear regression analysis, multivariate SPC and other improve process certification process and reduce process variation. The benefits of these tools further extend to problem solving and decision making through relentless root cause analysis. Thus, ACE and Six Sigma integration extends the benefits of these tools to ACE. In cooperating environment/ community and employee’s satisfaction perspectives in the existing balanced scorecard (BSC) extends business performance measurement to more dimensions. The new perspectives together with BSC‘s four perspectives are smoothly translated to ACE Control Tower six categories at strategic level. This helps to track, monitor and evaluate the effect of ACE or integrated Six Sigma and ACE on organization strategies and performance. An Action-learning model facilitates understanding the current situation and employee’s perceptions and involvement in an improvement process. The model helps organizations to bring organizational change and to create a clear understanding of current situation. Action-learning model play a great role in bringing paradigm shift from result-oriented to means driven culture and in developing safe practice field to support network (community of practice) of fellow employees. A well-structured Cell formation guideline that defines the number of employees per Change Agents per Cell, ways to weight operational activities in a Cell and ability to solve conflicts of interest between sections in a Cell must be developed. To reduce employees’ turnover and internal transfer, an incentive or compensation plan for those Cells with excellence business performance must be put in place. Moreover, organizations should create knowledge management system to capture the tacit knowledge from senior quality management experts. The integration makes ACE more data and fact driven, execute process certification on project basis with top-down approach, total value chain gets more focus, improve new products and services design and increased employees and suppliers involvement and get other benefits.","Six Sigma; Process Improvement; Quality Improvement; Achieving Competitive Excellence","en","master thesis","","","","","","","Campus only","","Technology, Policy and Management","Management of Technology","","Energy and Industry","",""
"uuid:88e9ff01-8a67-4d31-9aa8-420d769661e0","http://resolver.tudelft.nl/uuid:88e9ff01-8a67-4d31-9aa8-420d769661e0","Measure, understand and improve cities: Visualizing pedestrian flows to improve inner-city quality in Delft using GPS-tracking technology","Van Langelaar, C.M.","Rooij, R.M. (mentor); Van der Spek, S.C. (mentor); Van Dorst, M.J. (mentor)","2011","We all have walked on a street when suddenly someone comes over to you asking for directions. Sometimes, people do not know where they are and they do not know how to reach their destination. They are lost. However, people should not depend on others to find their way. The urban fabric should be legible enough to find one’s way. The problem statement of this Master Thesis is that people should wander and stroll through the urban fabric instead of getting lost. Consequently, for the graduation project we zoom in to one of the many aspects of “good public space”, namely the element ‘wayfinding’. What is good public space in relation to pedestrian’s ability to orientate themselves in the historic city centre? The first chapter deals with wayfinding, its definitions, how it is related to the city centre of Delft, environmental psychology and urban economy. The aim of the graduation project is to better understand how people navigate in cities in order to develop recommendations for urban planning and design to make city visits more enjoyable, engaging and involving for pedestrians. The main research question for the graduation project is: “Which strategic spatial design interventions can improve public space for the slow traffic network in order to retain city visitors in the city centre of Delft?” This subject will be solved by answering four sub-research questions: (i) What are criteria for successful public spaces looking at pedestrians walking in city centres? (ii) What is the current quality of the streets and built environment in the city centre of Delft? (iii) Do pedestrians (visitors/tourists, city centre inhabitants and neighbourhood residents) use the public space in the city centre of Delft differently? (iv) How can the criteria for successful public spaces, the analysis of the current situation and the conclusions of how people use the city centre be embedded in strategic spatial (navigational) recommendations for the city centre of Delft? Applied methods in order to answer the sub-research questions are: (ad i) Literature review studies (a general study about good public space and a specific wayfinding study). (ad ii) Evaluation of the city centre by mapping urban facilities, making a Three-Step analysis, measuring walking distances from two garages, visibility graph analysis, history of Delft by a morphology analysis, quality analysis perception of the city centre based on participants’ questionnaires and a visual analysis (photographs). (ad iii) Actual pedestrian movement is gathered and mapped by doing two GPS-tracking research pilots in the city centre of Delft (a) November 2009: following visitors/tourists who park their car in the Phoenix or Zuidpoort garage and who continue their journey on foot (b) April/May 2010: following city centre inhabitants and neighbourhood residents of Delft. Results are mapped in ArcGIS and statistics are made in SPSS and Excel. Behaviour of the three different pedestrian groups is compared, where after results and conclusions are noted. (ad iv) All gathered information is put into a self made GPS-flowchart: the model shows a researcher in four steps which strategic interventions are recommended for a project area. To answer the main research question, first a future vision of Delft 2030 is described which is followed by a mission, vision and strategy for the city centre of Delft. Consequently, strategic spatial design interventions are proposed, divided into conservative short term and ambitious long term scenarios. The GPS-flowchart is used to determine a strategy for a specific area in the city centre. Due to the fact that there is an enormous amount of data available, several tips for follow-up research are suggested.","urban environment; historic; city centre; visualisation; pedestrian movement; walking; measuring; understanding; improving; spatial quality; GPS; tracking; good public space; wayfinding; environmental psychology; urban economy; GIS; SPSS; city centre evaluation; urban facilities; three-step analysis; walking distances; visibility graph analysis; quality analysis perception; visual quality analysis; density analysis; used streets; non-used streets; mission; vision; strategy; spatial interventions; BCG-matrix; star; cash cow; question mark; dog","en","master thesis","","","","","","","","2011-05-12","Architecture","Urbanism","","Studio Urban Acupuncture","",""
"uuid:d29a4ce6-880a-416c-a189-0304f8ae0cdb","http://resolver.tudelft.nl/uuid:d29a4ce6-880a-416c-a189-0304f8ae0cdb","The effect of filter jacket clogging on the performance of prefabricated vertical drains in soft soils","Kochx, J.P.","Van Paassen, L.A. (mentor); Ngan-Tillard, D.J.M. (mentor); Dijkstra, J.W. (mentor)","2011","Prefabricated vertical drains (PVD) are used to accelerate drainage and consolidation of soft sediment. An effective functioning of these PVD depends on its capacity to drain water from the subsurface. Among other causes, the clogging of filter jackets is thought to be of a considerable negative influence on the functioning of PVD. Current regulations prescribe a minimum ratio between the filters aperture size and the grain size distribution of the soil to prevent this clogging. Objective: The objective of this thesis was to evaluate the effect of filter clogging on the performance of PVD filter jackets, with regards to the soft soil conditions that are encountered in large parts of the Netherlands. Method: A literature review is performed on the principle of vertical drainage, soil types, filter types, clogging criteria, processes and testing methods. An experimental program was undertaken in the laboratory in which filter jackets were exposed to two different clogging phenomena, i.e. particle clogging and chemical clogging. Also filters from the field were evaluated. All filters were evaluated on their loss of permittivity with constant head measurements on filter pieces of three different filter types, the D165 and HS5417 from the Typar line of DuPont and the 30195 of Freudenberg. Particle clogging was evaluated by two different setups, the Oedometer and a long term filtration setup. Within the Oedometer tests the load and the moisture content of the clay sample varied. Chemical testing was done briefly, to see till what extend iron precipitation could induce filter clogging and if one filter would be more prone to clog than the other. Results: The permittivity tests on the filter pieces showed reproducible results. Repeated measurements on the same sample showed an average standard deviation of not larger than four percent of the samples mean. The initial permittivity also corresponded reasonable with the values provided by the filter manufacturers. With particle clogging, it was seldom observed that clogging ratios were higher than five. Relations between clogging and the applied load on the clay sample could not be found. Increasing moisture content showed a slightly higher clogging ratio. Another clogging indicator was found from work by Aydilek, initial permittivity. This is believed to be a better estimator; higher initial permittivity in general gave lower clogging ratios. In the chemical experiment it was observed that on the filter of Freudenberg large amounts of iron oxide precipitated. During filtration the filter seemed fully clogged. Permittivity tests on this filter showed an approximately four times larger clogging ratio, than that of the other ones. Conclusions: Based on literature and observations from both experiments and field data, it can be concluded that the permittivity reduction of filter jackets is always less than a factor of ten. Hence filter clogging is not a real issue, since the permeability of the soft sediments is several orders of magnitude lower than that of the clogged filters. Hence, the system permeability is mainly determined by the soil behavior.","geosynthetics; particle clogging; chemical clogging; ground improvement; prefabricated vertical drains; filter jackets; nonwoven","en","master thesis","","","","","","","","2013-03-22","Civil Engineering and Geosciences","Geotechnology","","Geo-Engineering","",""
"uuid:0836a855-40d9-4cf1-9100-fcf853df09f3","http://resolver.tudelft.nl/uuid:0836a855-40d9-4cf1-9100-fcf853df09f3","The Effect of Porefill on Pre- and Post-stack Seismic Data in a Dutch Buntsandstein Reservoir","Auduson, A.E.","Andries, W. (mentor); Arts, R.J. (mentor)","2010","Wintershall is operating a number of Buntsandstein fields in the Southern North Sea. It has proven a major exploration challenge in the area to predict the reservoir quality of these fields based on seismic data only. The effect of salt present in the area plugging the pore space leads at first sight to similar seismic responses on post-stack data as for gas filled reservoirs. This study aims to gain better insight into the (subtle) differences in seismic response induced by water-, gas- or salt-fill scenario. The approach adopted is by studying the seismic response at various existing wells in one of the fields and the corresponding seismic responses of the processed 3D seismic survey. First a thorough analysis of the log responses of 13 wells is made and the effect of a.o. depth trends, compaction, diagenesis and facies changes to the seismic response is qualitatively investigated. Then, a match between the log data and the poststack seismic data is established by creating synthetic seismic data. Finally by using fluid substitution and more recent solid substitution theory, subtle changes in seismic response, both pre-stack and post-stack, between the different porefills are predicted. Based on these modeled predictions recommendations are made concerning the type of data analysis that should be carried out to discern the different porefills on the seismic data. The results of this research should lead to an improved characterization of the Buntsandstein reservoirs and as a consequence, to a higher success rate in drilling (i.e. less “dry wells”).","exploration challenge; seismic response; synthetics; reservoir quality; improved characterization; post-stack; pre-stack; Buntsandstein","en","master thesis","","","","","","","","","Civil Engineering and Geosciences","Geotechnology","","Applied Geophysics and Petrophysics","",""
"uuid:10dca27f-efaf-499c-b438-5ed144de1678","http://resolver.tudelft.nl/uuid:10dca27f-efaf-499c-b438-5ed144de1678","Jetgrouten, precisie met geweld","Van Dalen, J.W.","Admiraal, B.J. (mentor); Bezuyen, K. (mentor); Polen, B. (mentor); Van Tol, A.F. (mentor)","1997","Jetgroutkolommen worden gevormd door onder hoge druk een groutmengsel in de grond te injecteren. De grond wordt versneden, losgewoeld en vermengd met de gernjecteerde vloeistof. Door de boorbuis roterend te trekken ontstaat een cilindervormig element. Afbankelijk van het gekozen systeem geschiedt het snijden met dezelfde of met een andere straal dan het mengen. Gesproken wordt van het 1, 2 of 3 fase(n) systeem jetgrouten. De jetgroutkolommen kunnen na uitharding worden gebruikt als waterremmend en/of constructief element. Jetgrouten kan in iedere grondsoort worden toegepast. De ervaring in Nederland met de jetgroutechniek is beperkt tot enkele werken. Visser & Smit Bouw is vooralsnog de enige aannemer in Nederland die beschikt over het benodigde materieeI. De diameter en de sterkte van de kolom worden bepaald door de uitvoeringsparameters en de grondeigenschappen, samen de invoerparameters van het systeem. Onder de uitvoeringsparameters wordt verstaan de injectiedruk, het injectiedebiet, de luchtdruk, de treksnelheid, rotatiesnelheid e.d. De belangrijke grondeigenschappen zijn de cohesie, de dichtheid en het poriengehaIte. De moeilijkheid bij de techniek betreft het voorspeIIen van het resultaat (diameter en sterkte) op basis van de invoerparameters. Het doel van dit onderzoek is tweezijdig. Enerzijds is gezocht naar verbanden en relaties tussen de invoerparameters en het resultaat en anderzijds is gekeken naar de uitvoeringsaspecten van de techniek. Dit laatste betreft ook een meetmethode voor de diameter tijdens de uitvoering van de kolommen. In het kader van de bouw van een tramtunnel in het centrum van Den Haag, het zogenaamde Souterrain, is een uitgebreide jetgroutproef op ware grootte uitgevoerd. Het doel van de proef was het bepalen van de uitvoeringsparameters voor het maken van een groutboog die de waterafsluiting aan de onderzijde van de bouwput vormt. Het 2 en 3 fasen systeem is beproefd, waarbij gevarieerd is met injectiedrukken, debieten, treksnelheden en water/cement-factoren. Tijdens de uitvoering zijn met behulp van een spinapparaat diameterbepalingen gedaan en zijn verse monsters aan de kolom en retourspoeling onttrokken. Na uitharding van de proefkolommen is de put ontgraven, zodat het resultaat kon worden bestudeerd. Vit de kolommen zijn kernen geboord die aan druk- en splijttesten zijn onderworpen. Dit verslag bevat de beschrijving en de analyse van de jetgroutproef. Onderscheid is gemaakt tussen volumieke massa en sterkte van de verschilIende monsters en de diameter van de kolom. Het jetgroutproces is te complex om te komen tot een aIIes omvattend rekenkundig verband tussen het resultaat en de invoer. Het grote probleem blijft het betrekken van de eigenschappen van de grond in een berekening. Toch zijn enkele interessante bevindingen gedaan. De belangrijkste bevinding is de relatie tussen de invoer en het diameterresultaat via de begrippen hydraulische of kinetische energie van de snijstraaI. De hydraulische energie wordt berekend met de snijdruk, het snijdebiet en de treksnelheid, terwijl de kinetische energie wordt berekend met de massa en snelheid van de vloeistof en de treksnelheid. Indien de energiesoorten tegen de diameter worden uitgezet, ontstaat een energiekromme. Deze kromme ligt voor ieder systeem en grondsoort anders en kan worden gebruikt bij het vaststelIen en vergelijken van de uitvoeringsparameters. Voordat met een jetgroutwerk wordt begonnen moet een grondonderzoek worden uitgevoerd, zodat de grondeigenschappen over het te grouten traject in kaart gebracht kunnen worden. Op deze wijze kan tijdens het jetgrouten worden geanticipeerd op wijzigingen in bodemgesteldheid, zodat de kwaliteit van de kolommen gehandhaafd blijft. Met behulp van diameterbepalingen met bijvoorbeeld een spinapparaat kan de diameter vlak na het jetgrouten worden gemeten.","jetgrouting; soil improvement; foundation engineering; grout; pile foundation","nl","master thesis","","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""