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 79 for “"Engineering, System Science"”.
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Solver for TCP flows in a network
Quality of Service (QOS) of a congested network can be evaluated by some key factors such as packets discarding rate, queueing delay and the throughput of a bottleneck buffer. A network designer needs to predict these parameters in order to dimension a network properly. This thesis developed a …
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Multiple classifier combination through ensembles and data generation
This thesis introduces new approaches, namely the DataBoost and DataBoost-IM algorithms, to extend Boosting algorithms' predictive performance. The DataBoost algorithm is designed to assist Boosting algorithms to avoid over-emphasizing hard examples. In the DataBoost algorithm, new synthetic data …
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Three-dimensional visualization of multi-layered graphs with application to communications
This thesis introduces two new algorithms for 3D graph drawing and network display. The first algorithm, the Incremental Projection Algorithm , is a new universal algorithm for displaying any graph of any vertex degree. The above algorithm can be implemented to display graph in 3D space without …
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A multiplexed feedback solution for isolated digital power supplies
… started looking at ways to control the system cost by reducing components and their technical requirements. This thesis proposes a multiplexed digital feedback solution for isolated digital power supply systems. Several digital isolators used in existing applications can be reduced to …
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Hybrid Switched System Visual Servo Control
Furthermore, nonholonomic systems present a control task that is not suitable for a single, continuous feedback controller. Switched-system control of IBVS and PBVS systems offer the opportunity to use vision data in the closed loop control of a nonholonomic system. We present such a …
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Using Stranded Assets Analysis to Inform Distributed Incremental System Design
… the choices they make impact the overall market system of their product. The product investigated is electrical power, which exists in a networked system of ten bus managers. These managers are given a choice of when to replace the electrical power generators on their busses to affect the …
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Policies and Mechanisms for Networked Control Systems
"The second mechanism we present is a ""Message Dispatcher"" (MD) layer for information dissemination in wireless vehicle-to-vehicle communication. The MD enables efficient and flexible transmission of data elements between vehicles. It has been implemented in several vehicles at Toyota, and has …
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Entropy Based Framework for Static and Dynamic Coverage and Clustering Problems
In this work, we consider the static and dynamic resource allocation, coverage and clustering problems, and propose a mathematical framework for formulating and solving such problems. The underlying combinatorial optimization problems are solved in a Maximum Entropy Principle (MEP) based framework. …
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Safe Control and Coordination of Multiple Autonomous Vehicles
… tracking problem and considers overall system stability and safety issues by incorporating elements from hybrid system automata, multiple Lyapunov functions, and modified avoidance functions related to avoidance control. Finally, a novel model predictive control coordination scheme for …
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Robust Repetitive Control and Its Application
… TPRRC as well as most other repetitive control systems typically takes one period (of the periodic exogenous signal) to converge. A feedforward control is proposed and shown to increase the transient convergence rate for the TPRRC when switching from one data track to another.
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Development of Arrival-Type-Based Uniform Delay Models for Signalized Intersections
The resulting models: (1) Consider platoon duration, flow rate and/or number of vehicles in platoon, (2) Are sensitive to traffic volume inside platoon, and (3) because a distinct delay model was deduced for each arrival type, the need for applying delay adjustment factors was eliminated. …
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An Evolutionary Based Methodology for Representing and Evolving Structural Design Solutions
Performing synthesis during conceptual design provides substantial cost savings by selecting the structural topology and geometry of the design, in addition to selecting the member sizes. Traditional optimization methods, however, cannot synthesize design solutions that have diverse structural …
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On Size and Control: The Use of Dimensional Analysis in Controller Design
… control and identification, and nonlinear systems analysis are presented.
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Striking the Balance: Long-Term Groundwater Monitoring Design for Multiple Conflicting Objectives
… order Pareto optimization (i.e., optimizing a system for more than 2 objectives) with visualization can allow designers in any field to assess the mathematical models used to represent their objectives, discover how their objectives are affecting designs, and negotiate a final design that …
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Time Headway and Platooning Characteristics of Vehicles on Interstate Highways
Mean time headway for platooning vehicles decreased as traffic volume increased. About 18% to 31% of platooning vehicles had a space gap that corresponds to a reaction time of 0.5 second or less, with more than half of these in large platoon of 5 vehicles or more. About 15% to 85% of platooning …
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Process Monitoring of Large Scale Systems
… detect and diagnose faults for these large scale systems using traditional process monitoring methods. However, by developing measures that more accurately characterize the state of the process, the plant engineers and operators can more effectively be incorporated into the process monitoring …
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Exploring Design Configurations of System Models: From Simultaneous Simulation to Search Heuristics
"In essence, this dissertation ""develops algorithms and techniques that would enable an efficient methodology to compare large numbers of alternative configurations in order to speedup the design evaluation and validation process"". ."
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Probabilistic Analysis and Scheduling of Critical Soft Real -Time Systems
Allowing a real-time system to miss some deadlines in exchange for better average performance increases the possibility of overload. While overload in real-time systems has been studied, the emphasis has been on hard real-time systems in which overload is an exception whose occurrence is to be …
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Queueing Network Analysis of Semiconductor Manufacturing Plants
We show how the performance bounds can be used to design wafer fabs. Specifically, one may formulate the problem as one of maximizing the performance subject to a capital cost constraint. Software has been developed both for performance bounds (called BoundFab) and for design (called DesignFab).
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Robust Control and Motion Planning for Nonlinear Underactuated Systems Using H -Infinity Techniques
… and to generate a feasible trajectory for the system. The feasible trajectory and its control inputs are improved through an iterative Hinfinity-filter. Techniques are demonstrated for generalizing the motion planning algorithm to address the obstacle avoidance, multiple vehicle, and minimum …
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