Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 38 for “"Systems dynamic"”.
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Efficiency in Cluster Database Systems - Dynamic and Workload-Aware Scaling and Allocation
Database systems have been vital in all forms of data processing for a long time. In recent years, the amount of processed data has been growing dramatically, even in small projects. Nevertheless, database management systems tend to be static in terms of size and performance which makes scaling a …
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Optimizing Bike Sharing Systems: Dynamic Prediction Using Machine Learning and Statistical Techniques and Rebalancing
… and that current transportation networks and systems cannot accommodate the current demand without a change in policy, infrastructure, transportation modes, and commuter mode choice. In response to this problem, cities in a number of countries have started putting a threshold on the number of …
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Reconfigurable modelling of physically based systems: Dynamic modelling and optimisation for product design and development applied to the automotive drivetrain system.
… said to be of less significance to the global dynamics of a model and thus become targets for elimination. A model configuration tool is presented that brings together the PLMC and parameter elimination algorithm. The tool is shown to be useful for rapid configuration and reconfiguration of …
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Dynamics and control of switchmode power conversions in distributed power systems
… techniques are developed for distributed power systems. Dynamic interactions caused by paralleling, stacking, and cascading converter modules are analyzed. Incorporating the effects of all subsystem interactions, systematic design procedures are established in order to optimize the dynamic …
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System dynamic framework for analyzing organizational stress : United States Postal Service case study
… and organizational. Our goal was to provide a systems dynamic framework that organizations, as well as individuals, can use to improve the understanding of the physiological and psychological stress loads, as well as understand their relationship to organizational key performance indicators. …
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The design and evaluation of an international plutonium storage system
… threat from excess Russian military plutonium. A systems dynamic model of global plutonium inventories projects a capacity requirement for an IPSS of 450 to 600 MT. A conceptual design of a representative 100 MT storage facility was shown to meet criticality safety requirements for a range of …
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Floor Vibration Design Criterion For Cold-Formed C-Shaped Supported Residential Floor Systems
… for cold-formed C-shaped residential floors systems. Dynamic impact and static loading tests were performed on twelve full size laboratory floors and five two-joist line laboratory floors to determine the influencing characteristics of annoying vibrations in metal framed floors. Similar tests …
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Strategies for dealing with instabilities in a complex, multi-project product development system engineering environment
… of the key drivers of cost and schedule risk. A systems dynamic model developed in a previous Systems Design and Management thesis was adapted to represent the product development process by adding structure and calibrating the model with realistic scenarios. The model evaluates the policies that …
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Prediction Models for Multi-dimensional Power-Performance Optimization on Many Cores
Power has become a primary concern for HPC systems. Dynamic voltage and frequency scaling (DVFS) and dynamic concurrency throttling (DCT) are two software tools (or knobs) for reducing the dynamic power consumption of HPC systems. To date, few works have considered the synergistic integration of …
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Entropy and surfaceness
… atmosphere which contains clouds and weather systems is a thin thermoregulatory surface. It maintains an exact energy budget between the Earth and the Sun. Recent work in theoretical physics is aimed at these types of dynamic systems. Key to a system such as the atmosphere is the constant yet …
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Design of robotic quadruped legs
… by rough and unstructured terrain. Conversely, systems that rely on legs have shown promising rough terrain performance but only a modest ability to achieve high speeds over flat terrain. The goal of this thesis is to develop four robotic legs that are capable of robust dynamic running over flat …
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A local model network approach to nonlinear modelling
This thesis describes practical learning systems able to model unknown nonlinear dynamic processes from their observed input-output behaviour. Local Model Networks use a number of simple, locally accurate models to represent a globally complex process, and provide a powerful,flexible framework for …
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A Wavelet-Based Rail Surface Defect Prediction and Detection Algorithm
… parameters. To generate this training data, a dynamic wheel-rail interaction model was developed that relates defect geometry to the side frame vertical acceleration signature. The model was generated by using combined systems dynamic modeling, and the system was solved with a developed …
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Power Systems Analysis in the Power-Angle Domain
The idea of performing power systems dynamic analysis in the power-angle domain has been hinted at by previous researchers, but this may be the first published document to develop detailed techniques by which entire power systems can be represented and solved in the power-angle domain. With the …
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Experimental Evaluation of Medium-Voltage Cascode Gallium Nitride (GaN) Devices for Bidirectional DC–DC Converters
… implemented in DC microgrids, energy storage systems play an increasingly significant role in ensuring uninterrupted power supply and in supporting the reliability and stability of microgrid operations. Power electronics, especially bidirectional DC–DC converters, are essential parts in …
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Trophic models of the Benguela upwelling system : towards an ecosystem approach to fisheries management
… 1980s and 1990s. Modelling experiments using the dynamic ecosystem simulation tool Ecosim, suggest that observed changes in pelagic fish catches between the 1980s and 1990s are unlikely to have played a large role in driving changes in abundance of anchovy and sardine in the southern Benguela …
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The architectural details of Alvaro Siza : a chorology
… comprised of many composite, active subsystems. These assemblages engage still larger systems, dynamic and effects producing. In short, the architecture goes beyond the visual, and generates effects in time and space - engaging animate operations that pre-exist the architecture while …
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Control and optimization of a multiple-effect evaporator
… and testing of several alternative control systems, Dynamic Matrix Control (DMC) was chosen as the bestwsuited control algorithm for the Triangle control problem. A dynamic model of the Triangle evaporator station was, developed to formulate and test the DMC and other controllers. The model …
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Virtual Inertia Emulation to Improve Dynamic Frequency Stability of Low Inertia Microgrids
… and the intermittent nature of photovoltaic systems, dynamic frequency stability issues arise in microgrids with large photovoltaic systems. This limits the maximum amount of photovoltaic systems that can be penetrated in the microgrid. In order to increase the penetration of photovoltaic …
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Improved qualification and algorithms for illinisat-2 attitude determination and control
… of a tri-axial square Helmholtz cage (HC3), a dynamic power supply (PS), and a software package simulating the satellite’s attitude dynamics. This thesis is split into three parts, the first section discusses the different methods for calibrating the PS and the HC3 to generate desired magnetic …
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