Searched for: subject:"database"
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Pasterkamp, Mark (author)
Most queries in a collection of queries, also called a query workload, to some degree have parts of their intermediate execution steps in common. These intermediate exe- cution steps, also called subexpressions, provide the opportunity to further optimize query workload execution in addition to the already existing query optimization done by the...
master thesis 2020
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Bunt, Riccardo (author)
During the design and analysis of a mission characterised by re-entry flight, consistent effort and resources are invested in the definition of the aerodynamic database of the re-entry vehicle. An aerodynamic database collects a set of dimensionless coefficients that describe the interaction of the vehicle's geometry and airflow, and an accurate...
master thesis 2019
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Fang, J. (author)
Though field-programmable gate arrays (FPGAs) have been used to accelerate database systems, they have not been widely adopted for the following reasons. As databases have transitioned to higher bandwidth technology such as in-memory and NVMe, the communication overhead associated with accelerators has become more of a burden. Also, FPGAs are...
doctoral thesis 2019
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Brunal Causil, Carlos (author), Russel, Renzo (author), Aminosharieh najafi, Mohammed (author), Lobman, Daryll (author), Oostmeyer, Sander (author)
Feedback-analytics, describing themselves as, "A Dutch based start-up for companies interested in improving both customer feedback and their employee efficiency, Feedback-analytics aims to be a simple yet robust tool that allows you to identify and manage points of improvement that your company might need ” The company started from the ground up...
bachelor thesis 2019
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Touloumis, Konstantinos (author)
The skyline operator has been proposed to bridge the gap between traditional and multimedia database systems by finding the optimal objects according to the notion of Pareto dominance. According to the notion of Pareto dominance an object dominates another if it is better in one attribute and equal in all others. Skyline sets end up being pretty...
master thesis 2019
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Nuha, Mohamat Ulin (author)
This thesis investigates the extent to which delta-based version control can be used to manage versions and the historical records of graph databases. The delta encoding is represented as a set of queries to reconstruct one version from the other. We presented Grit, a Git-style command line tool to do data versioning for graph databases. We...
master thesis 2019
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Zhang, Y. (author)
Among all the contributors to fatal accidents, in-flight loss of control (LOC-I) remains one of the largest categories, as indicated by statistics of investigations into past civil aircraft accidents. In flight LOC generally refers to accidents in which the flight crew was unable to maintain control of the aircraft in flight, resulting in an...
doctoral thesis 2019
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Abad, Belkis Filian (author), Lantsoght, E.O.L. (author), Yang, Y. (author)
The Critical Shear Displacement Theory (CSDT) was developed to determine the shear capacity of reinforced concrete beams based on the different shear-carrying mechanisms (concrete in the compression zone, aggregate interlock, and dowel action). This research aims at extending the CSDT to Steel Fibre Reinforced Concrete (SFRC) by adding the...
conference paper 2019
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Abambres, Miguel (author), Lantsoght, E.O.L. (author)
Comparing experimental results of the shear capacity of steel fiber-reinforced concrete (SFRC) beams without stirrups to the capacity predicted using current design equations and other available formulations shows that predicting the shear capacity of SFRC beams without mild steel shear reinforcement is still difficult. The reason for this...
journal article 2019
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Pasquinelli, Alice (author), Agugiaro, G. (author), Tagliabue, Lavinia Chiara (author), Scaioni, Marco (author), Guzzetti, Franco (author)
Smart management of urban built environment relies on the availability of data supporting sound policy making and guiding city renovation processes toward more sustainable and performant models. Nevertheless, public managers are unlikely to have comprehensive information on the existing building stock. In addition, tools providing effective...
journal article 2019
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Fang, J. (author), Mulder, Yvo T.B. (author), Hidders, Jan (author), Lee, Jinho (author), Hofstee, H.P. (author)
While FPGAs have seen prior use in database systems, in recent years interest in using FPGA to accelerate databases has declined in both industry and academia for the following three reasons. First, specifically for in-memory databases, FPGAs integrated with conventional I/O provide insufficient bandwidth, limiting performance. Second, GPUs,...
journal article 2019
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Abambres, Miguel (author), Lantsoght, E.O.L. (author)
When concrete is subjected to cycles of compression, its strength is lower than the statically determined concrete compressive strength. This reduction is typically expressed as a function of the number of cycles. In this work, we study the reduced capacity as a function of a given number of cycles by means of artificial neural networks. We used...
journal article 2019
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Ozer, I.E. (author), van Damme, M. (author), Jonkman, S.N. (author)
Understanding levee failures can be significantly improved by analysing historical failures, experiments and performance observations. Individual efforts have been undertaken to document flood defence failures but no systematically gathered large scale, open access dataset is currently available for thorough scientific research. Here, we...
journal article 2019
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Lantsoght, E.O.L. (author)
Adding steel fibers to concrete improves the capacity in tension-driven failure modes. An example is the shear capacity in steel fiber reinforced concrete (SFRC) beams with longitudinal reinforcement and without shear reinforcement. Since no mechanical models exist that can fully describe the behavior of SFRC beams without shear reinforcement...
journal article 2019
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Hofstee, Niels (author)
The construction sector contributes to a significant portion of global energy consumption, CO2 emissions and the use of material resources. As climate change escalates with rapidly increasing temperatures, more extreme weather patterns and rising sea levels, an urge to reduce the environmental impact is evident. <br/><br/>A discrepancy is...
master thesis 2018
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Sirdeshmukh, Neeraj (author)
Discrete Global Grid Systems (DGGS) have emerged in recent years as a new specification for working with global heterogeneous datasets of different types, such as vector, raster, and quantitative datasets. There exists no research on using point clouds with a DGGS. This research aims to analyse the extent to which a DGGS can be used to handle...
master thesis 2018
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Valle Torre, Manuel (author)
In this thesis, we focus on database query processing for so-called experience items, i.e., items commonly encountered in E-Commerce systems such as books, games or movies which are better described by their perceived subjective consumption experience, or Perceptual Features, than by factual meta-data normally used in SQL-style queries. To...
master thesis 2018
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Huang, Kangli (author)
The multi-way hash join is one of the commonly used and time-consuming database operations. Many algorithms have been developed to accelerate this operation, some of which use accelerators such as field programmable gate arrays (FPGAs). However, most of the previous work was focused on computation-intensive operations such as (de)compression,...
master thesis 2018
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Zeng, Xianwei (author)
As database systems have shifted from disk-based to in-memory, and the scale of the database in big data analysis increases significantly, the workloads analyzing huge datasets are growing. Adopting FPGAs as hardware accelerators improves the flexibility, parallelism and power consumption versus CPU-only systems. The accelerators are also...
master thesis 2018
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den Duijn, Xander (author)
Precise and comprehensive knowledge about 3D urban space, critical infrastructures, and below ground features is required for simulation and analysis in the fields of urban and environmental planning, city administration and disaster management. In order to facilitate these applications, geo-information about functional, semantic, and...
master thesis 2018
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