1 

Estimating the extreme value index for imprecise data
In extreme value theory the focus is on the tails of the distribution. The main focus is to estimate the tail distribution for a rounded data set. To estimate this tail distribution the extreme value index should be estimated, but due to the rounded data this extreme value index oscillates heavily. Therefore a correct estimate can not be obtained. By adding a small uniform stochast the rounded data can be smoothend out and in this way the oscillation can be cancelled.

[PDF]
[Abstract]

2 

An Online Patient Scoring System
At this moment when a clinician needs to conduct a study he will send allhis patients at various moments a questionnaire form. After retrieving theseforms the clinician will manually process all the data by hand. This is a time consuming job and could be automatized. During this project we created an application that automates this process. When using the developed application the only thing a clinician has to do is create forms, add patients and tell the system when a patient has to receive a form.

[PDF]
[Abstract]

3 

DICOMmunicator: An Online Medical Image Transfer Service
Medical doctors and researchers have to send medical image files to each other. This may be for a consult, because a patient is treated by a different doctor or because the files are to be used for research. The files contain personal health information, and privacy rules have to be satisfied before the files may be sent. To securely send the files the data should be encrypted and anonymized.
The problem led to the development of DICOMmunicator, a single page web application. It allows clinicians to use the selfdescriptive application to send DICOM files to another doctor. DICOMmunicator removes patient information from the files that are uploaded, encrypts the files and stores them in a database. The recipient of the files is sent an email containing the key used for decryption allowing only that person to download the files.

[PDF]
[Abstract]

4 

Sound Reflections in an audiobased game for visually impaired children
In this thesis a model for sound reflections designed which is to be used in an audiobased game for visually impaired people is described. This project is a part of a threegroup bachelor graduation project of six peoplein total. The three groups combined create a working game for visually impaired children, meant to be used to train the user’s ears and brain to visualize their surroundings using sound only. Using the mirror source method, a model for sound reflections in concave 3D rooms is obtained. Important parts of this model are the placement of the mirror sources, the calculation of a line of sight and a model for the energy absorption of a wall when sound is reflected off of it. The placement of mirror sources and a model for the wall absorption were successfully implemented. The calculation of a line of sight is only half finished.The implementation of the model in the game adds a sense of the location and the materials of the walls.The execution time of the model is however too low to run the model completely in real time.

[PDF]
[Abstract]

5 

Agriculture in Kenya: Design of a smallscale irrigation system to stimulate agricultural activities in Kilole.
This thesis presents the results of a research done on the agricultural situation of Kilole. Kilole is a small Kenyan village located between Mombasa and the Tanzanian border.
Looking at the annual rainfall, it can not be said that there is a lack of it in Kilole. However, because of its poor distribution the year is diverted in two rain seasons and two dry seasons. This has great influence on agriculture, because most crops can not withstand drought very easily. To understand the agriculture, a rainfall analysis has been performed first. With daily rainfall data from over thirty years, all kind of analysis have been performed. A trend analysis showed that there is no trend in the annual rainfall data. The long rain season onset has been determined, which is on average the 112th day of the year. Also a dry spell analysis has been done to see in which way drought occurs within the dry season. This showed that most rain falls within a very limited number of days and that the chance of having no rain for a week is already 78%. After an idea how the rain behaves was obtained it was time for a field trip. During two weeks the village of Kilole and its surroundings were visited in order to gather as much of relevant data. With the help of some semistructured interviewing techniques it was tried to get an idea of the situation Kilole. It turned out that Kilolean farmers mainly grown maize, cassava and tomatoes. A lot of farmers use irrigation techniques to increase the yields of these crops and to make sure multiple crops can be grown each year. About half of the farmers in the village use irrigation, from which surface irrigation is most popular. Everybody digs holes to gain access to the groundwater. This is generally located thirty to one hundred centimeters below ground level, throughout the year. This means that that is always sufficient water for irrigation and that most crops can flourish, even in the dry season.
Some people have the idea that the situation in Kilole should be improved. Improved in a way of higher yields, more crops and more irrigation. A number of initiatives have been seen from which three where pointed out to be of the most influence. The first was a dam that the government built a couple of years ago, together with the village. In the river bed paddy rice is grown in the wet season. The Kenyan government is campaigning for more rice production in the country and therefore financed a dam. This dam created a reservoir from which water could be used in the dry season to produce another harvest of rice every year. Due to a poor constructed dam it did not last long. Farmers were very content with the system, but since it does not work anymore and there are no funds, it is no longer used. The second initiative was a farmer which invested his profits in a well which now can be used freely by the villagers for drinking and irrigation. This shows that many people are willing to invest in the village in order to get higher yields and better welfare in general. The last imitative was a group of farmers which got funded with a microcredit from abroad. This showed that many people are definitely eager to improve their lives and the village, but that a lack of funds often barricades the road to success.
It was concluded that there is a general willingness to invest, produce and put effort to gain more. The only thing that withholds most farmers is a lack of knowledge, awareness or funds. Together with the Kilole Primary School it was concluded that one of the things to get this improvement is to start a educational program on irrigation. Hereby it is hoped to get rid of the lack of knowledge and awareness on agriculture and irrigation. Furthermore, this irrigation project would be a new (small) source of income for the school, which can be invested in better overall quality of the school. To achieve this a smallscale irrigation system was designed. Using harvested rainwater, the system is gravity run. This means that to external (mechanical) energy is needed to keep the system running. The only problem is the transport of water from the rainwater storage tank to the small polytank this is located 10 meters further and 1.5 meters above ground level. The solution is to use the energy of the pupils. Every week one of the three highest classes will have duty and with the hole class water is transported with buckets every day. Having the tank emptied twice a day will make sure the tomatoes will grown their best. Tomato crops are located in a greenhouse, to prevent pests, animals and extreme weather to ruined the harvest. Calculations and models showed that the system worked and that a small profit will be made every year.
It can be concluded in the end that there are possibilities for Kilole to improve. People do want this and are willing to. The only problem is the lack of knowledge, awareness and funds. The first two will be taken away in time by the irrigation system at the primary school. Only the lack of funds is still a problem which has to be tackled. Though it is shown that there is a proper solution, microcredits can only solve this problem completely when more people are willing to invest their money in villages like Kilole.

[PDF]
[Abstract]

6 

Influence of Transient Effects on Fitting Parameters to SAG Foam CoreFoods
Foam is a promising means of increasing sweep efficiency in enhanced oil recovery processes where gas is injected into a reservoir. However, the effectiveness of foam is hard to predict due to its complex behavior. Therefore accurate modeling is important to effectively predict field performance. This requires correct foam parameters in reservoir simulation. These parameters can be fit to laboratory data where gas is injected into surfactantsaturated rock samples. Foam simulation models can be used to translate experimental laboratory data to the field scale. Unfortunately, the widely used local equilibrium model assumes instant local equilibrium everywhere, while the lab data shows dynamic behavior. Distortion in latetime simulation results of the model could occur as consequence of not having a good fit in the dynamic period, where the chosen foam modeling parameters are incorrect. The aim of this paper is to research how much influence this mismatch has on the fit of the model to the laboratory data, which is taken from literature. Testing will be performed with the use of a onedimensional dynamic foam model. The findings in this work do not indicate clear evidence that fitting longtime behavior is distorted by disregarding a good fit in dynamic shorttime behavior. This means that the researched modeling parameters could be correct in predicting local equilibrium behavior. Even when a good fit for short times where dynamics play a role is disregarded.

[PDF]
[Abstract]

7 

Effects of Reynolds number and density on a JetinHotCoflow

[PDF]

8 

The choices of weights in the iterative convex minorant algorithm
In statistics one often encounters the problem of estimating a function based on a given dataset. Sometimes shape properties such as monotonicity of the function are known. This property can be used in a nonparametric regression model. The iterative convex minorant(ICM) algorithm can be used to compute an estimate of a convex regression function. In the ICM algorithm positive weights can be chosen arbitrarily. In this thesis we describe the (solution of the) isotonic regression problem, explain the ICM algorithm, describe the convex regression problem and present a simulation study to assess the effect of the choice of weights.

[PDF]
[Abstract]

9 

Het lassen van duplex roestvast staal

[PDF]

10 

Dynamische verweking
In deze thesis komt het onderwerp dynamische verweking aan bod, er wordt onderzoek gedaan naar het verschijnsel, waarbij is vastgehouden aan de volgende hoofdvraag: “hoe zit het verschijnsel dynamische verweking precies in elkaar, welke parameters hebben invloed op het verschijnsel, wanneer treedt het fenomeen op en hoe is dit te voorspellen?” deze hoofdvraag zal in deze thesis worden ontleed om zo stap voor stap antwoord te geven en het verschijnsel te kunnen verklaren.

[PDF]
[Abstract]

11 

Temperature based heart rate detection: Heartbeat measurement in a headset
This thesis, assigned by Plantronics®, contains the implementation of a temperature based heart rate sensor as an alternative to established sensing methods. This is realised by the use of 0402 package NTC thermistors in a bridge configuration. The data acquisition is done by the use of a National Instruments USB6210 data acquisition module. This data acquisition module sends information to a computer, where it is processed in MATLAB. The acquired data is then filtered and the heart rate is determined from the frequency spectrum. In the end, the system was able to measure the heartbeat on several locations on the human body and temperature differences up to 0.05mK.

[PDF]
[Abstract]

12 

Design of an Energy Management System for usage in the ‘DISQ’ portable fitness device
In this thesis the design of a frictionless resistance system with a speed independent mechanical resistance is presented, this system is meant for the portable fitness device "DISQ". The goal of this device is to provide a mobile exercise similar to an exercise with weights but with more flexibility. The goal of the change from the current friction braking version to the one discussed in this thesis is to minimise wear on the device and to ease the user’s interaction with the device.
This is accomplished by implementing the frictionless resistance with a rheostatic braking system which is controlled to provide the speed independent mechanical resistance. The control circuitry is fed by a battery system which is recharged through combining the rheostatic braking system with a small regenerative braking system.
The system described in this document shows that the afriction less resistance for a portable fitness device can be obtained through rheostatic braking and that it’s also feasible to harvest energy from this process for powering the control system. The implementation discussed in this document is not yet sufficiently small and cheap for a commercially viable fitness device. It does however show that this method of implementing it can work and with further development a version can be made that is sufficiently small and cheap.

file embargo until: 20190102
[Abstract]

13 

Development of a study area. Case study: Day River Basin
This thesis is about the development of a study area for the Hanoi University of Natural Resources and Environment (HUNRE). This university has chosen the Day river basin (next to Hanoi) to use as a study area for Integrated Water Resources Management (IWRM) education. This thesis will focus on two courses of the bachelor program of HUNRE: Water Resources Monitoring (WRM and Water Resources Systems Modelling (WRSM).
The first objective of this thesis is to explore the study area. The data and information which will be collected during fieldwork, a literature study and analysing the available data will be collected in a database. This data will be the input data for the models of the course WRSM.
The second objective is to develop a practical site for the course WRM. At this practical site students will measure the cross section (water depths) and flow velocity. With the flow measurements the students can calculate the discharge. With the information/data from the first objective it will be possible to select a measurement location, measurement methods and equipment. After some trial measurements a guideline will be written, so the students can follow this guideline during the practical.
The study area exists of two tributaries of the Red River; the Tich River and the Day river. The characteristics of these rivers are different. The Tich River is a natural river, with its origin in the Ba Vi mountain range. The Day river is now a ‘’dead’’ river. This is caused by the two control structures (Day dam and the Van Coc sluice) upstream. This results in a flow velocity of nearly zero. This is also the reason why the Day river is much more polluted than the Tich River. At the moment the government is constructing a new channel from Cam Dinh to the Day River which will supply fresh water to the Day River.
After some fieldtrips a measurement location at the Tich River is chosen which met all requirements to function as practical site for students. At this location an irrigation company has built a stair from the dike until the water surface. With this stair the river is easily accessible and this stair can be used as a reference for reading the water level.
The next step was to select measuring methods for this location and select equipment to for these methods. A staff gauge is chosen to measure the water depth. The velocity area method is chosen to measure the discharge at the measurement location. The flow velocity which is needed for this method is measured by a propeller current meter.
The last phase of the fieldwork existed of trial measurements at the measurement location. At the moment of the trial measurements it was dry season, this means a low water depth and a low discharge.
After the trial measurement a guideline for the course Water Resources Monitoring is written. This guideline contains background information about the study area, explanation why this location is chose to measure, an description of the methods and equipment, a step for step guideline to measure the water depth and flow velocity and some questions about the practical and theory behind the measurements.
The final recommendations for the total study area are:
• Monitor the influence of the new Cam Dinh channel. This channel can alter the characteristics of the study area drastically.
• Keep the database up to date
The final recommendations for the measurement location are:
• Collect more information about the measurement location from the Day irrigation company, they have precise information about the location of the reference level
• In the future it is useful to develop a second measurement location.
• The practical site can be used for more measurements of other courses, for example water quality measurements or meteorological measurements.
• Monitor the water level with a continuous water level recording device like a diver
The final recommendation for the course WRM and WRSM are:
• Collect missing input data for the models of WRSM
• Improve the guideline after the first students are finished with the practical

[PDF]
[Abstract]

14 

Design of a Performance Benchmarker for Fully Distributed IaaS Clouds
Nerdalize B.V. is an infrastructureasaservice (IaaS) cloud provider aiming to offer substantially lower prices than its competitors. In order to visualize its cost savings to customers and measure its own systems against competitors in a cloud market reigned by opaque pricing models, it would like to utilize an application benchmarker to give customers insight into the resource utilization and operation costs of their applications among various cloud providers.
We have done research into the fields of cloud computing, benchmarking and the intersection thereof, determined requirements for such a benchmarker, and assessed any existing solutions in the field. We then chose Nerdalize’s internal prototype implementation as a suitable base to develop a fully featured, productionready application benchmarker. We identified five main design goals of correctness, robustness, security, extensibility and maintainability.
We then analyzed and prioritized potential improvements and extensions to this prototype, and implemented them in an agiledriven Extreme Programming (XP) development process. The main contributions lie in designing and implementing a fully automated test suite and system, vastly improving the accuracy and stability of the benchmarker, redesigning the deployment model from monolithic to modularized and extensible, implementing support for provisioning to arbitrary Linuxbased hosts, and deployment of complex workload architectures.
We then experimentally verify the accuracy of the benchmarker, and assess that its deployment overhead is very small to negligible, and run several tests against realworld cloud providers. The end result of this project is a stable, welltested, featured benchmarker application that is used in production environments at Nerdalize.

file embargo until: 20161231
[Abstract]

15 

A mathematical model of cell migration and deformation in various situations
A mathematical model of the migration and deformation of cells on a cellular scale is simulated. The cells are represented by a boundary and a nucleus. The boundary and nucleus are divided into several points, where the boundary points as well as the nucleus points are connected to each other by a series of springs. The model considers one or more cells (with different shapes), which are attracted by either one source, several sources or other cells. Finally the deformation of the cells in these different situations will be discussed by comparing the socalled Cell Shape Index.

[PDF]
[Abstract]

16 

Designing interactive demonstrations of optics phenomena
The United Nations and Unesco have declared 2015 to be the international year of light. The Optics department of the faculty of Applied Physics from the TU Delft has decided to contribute to this effort by designing optics experiments to be displayed at the Science Center Delft. The goal of this project was to manage first year students that helped design and explain these experiments. Another part was to design an experiment involving lithography. The students were split into three groups, each with a different subject, polarization, cloaking and light emitting diodes. The management part of the subject went well; ten experiments were designed and the principle behind them were explained on posters. I have learned that communication is very important in teamwork and that the group members need to be motivated in order get the proper results.

[PDF]
[Abstract]

17 

Stability analysis of the equations of motion for the 2014 Delft Solar Boat
The TU Delft Solar Boat is a very efficient boat that sails on solar power. To reduce drag the boat lifts out of the water with the hull and "flies" on two hydrofoils. As a result the boat is likely to fall over and seems to be unstable. To analyse the stability we first made a mathematical model that describes the motion of the boat. Based on this model we calculate numerically whether the boat is stable under the given conditions. The stability analysis for our model indicates that the boat is not stable, as expected. Next we investigate how to improve the stability of the boat.
To derive the model, the equations of motion of the Solar Boat have been derived using a force and torque balance. Most forces depend on drag and lift coefficients of parts of the boat. Those coefficients depend on the incident angle and have been approximated by polynomials as function of the angle. For rotational motion the inertia moments are important and those have also been approximated. The result is six nonlinear differential equations of second order, which have been reduced to twelve first order differential equations, still nonlinear. Euler forward time integration has been used to calculate how the boat moves in time for different initial conditions. We used the symmetry of the boat and the Newton Raphson method to calculate quasilinear solutions of the system for all realistic velocities. The problem has been linearized around these points and the eigenvalues of the matrix have been determined. The real positive eigenvalues found indicate that the boat is not stable.
A parametric study has been done to determine what possible changes on the boat have positive influence on the stability. This parametric study shows that, in order of priority, the following have this possible influence:
bring the struts closer together
make the front hydrofoil narrower
move the driver more to the front of the boat
The largest eigenvalues does not drop below zero using any of those variations. Therefore, according to our model, it does not seem possible to make the boat stable by varying those parameters.

[PDF]
[Abstract]

18 

A boolean QPQ using single photons
I propose an implementation of the quantum private query protocol
as described in an article using a photon to encode a question and reflectionor transmission of the photon as answer options. Each question is represented by a photon in a transmission line with both ends returning to the user, and the answer is represented by reflection or transmission of this photon caused by the single photon transistor as described in another article. By solving the quantum Langevin equations for the 32 × 32dimensional operators describing the single photon transistor the system is analysed. This analysis shows that the user privacy is maintained when the returning transmission lines are under the user's control. The probabilities for reflection and transmission are calculated to verify the behaviour of the answering mechanism. By using pulse trains instead of numbered lines to represent questions, the scalability of the system could be improved.

[PDF]
[Abstract]

19 

Valt er geld te verdienen aan het voorspellen van Voetbaluitslagen?
In dit verslag is onderzocht of er geld te verdienen valt aan het spelen van online voetbaltoto. Er zijn twee modellen onderzocht; één op basis van onderlinge resultaten en de ander op basis van achtergrondvariabelen. Vervolgens zijn deze getest op fictieve en historische data en met elkaar vergeleken. Als conclusie is er gevonden dat er zeker een kans bestaat dat de modellen winstgevend kunnen zijn, maar dat er te weinig data is om dit met zekerheid te zeggen.

[PDF]
[Abstract]

20 

Regularisatie Methodes voor Seismische Tomografie (Regularization Methods for Seismic Tomography)
In seismic tomography, parts of the Earth are reconstructed by the travel times of seismic waves that are measured by seismometers. These tomographic problems can be formulated as a system of linear equations. Unfortunately, most of the time the system is illposed, because of ray bending and noise. This problem can not only be found in geophysics but also in other sciences, like radiology and astrophysics.
Regularization methods replaces the illposed problem with a "nearby" wellposed problem whose solution is a good approximation of the true solution. The main goal of this report is to understand two regularization methods, Tikhonov and another regularization which we will call the Saunders regularization, and to investigate when these regularization methods are equivalent and which regularization matrices can be used for Saunders regularization.
Saunders and Tikhonov regularisation are equivalent when the identity matrix is used. But when an arbitrary matrix is used, the regularization methods are not equivalent. We also examined choices for the regularization matrix for both methods. It was not very clear which matrix one should use for the Saunders regularization, but for Tikhonov regularization method we used a smoothing operator for the solution in both horizontal en vertical direction. For Saunders
regularization we also used a smoothing operator but instead for the solution, a smoothing operator for the residuals as regularization matrix.

[PDF]
[Abstract]
