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.
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Showing 1 to 20 of 41 for “"systems simulation"”.
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A Systems Simulation of the Classic Maya Collapse
Made available in DSpace on 2014-12-14T05:35:25Z (GMT). No. of bitstreams: 1 8108589.pdf: 12975591 bytes, checksum: 42a613c5d79c0964933412da756d30ef (MD5) Previous issue date: 1980
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Superheat control for air conditioning and refrigeration systems: Simulation and experiments
… system efficiency to reduce the impact these systems have on global energy consumption. Efficiency improvements have been accomplished through component design, refrigerant design, and most recently control system design. The emergence of the electronic expansion valve and variable speed …
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The gap between necessity and sufficiency for stability of sparse matrix systems: simulation studies
Sparse matrix systems (SMSs) are potentially very useful for graph analysis and topological representations of interaction and communication among elements within a system. Such systems’ stability can be determined by the Routh-Hurwitz criterion. However, simply using the Routh-Hurwitz criterion is …
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Quantitative modeling of spatiotemporal systems: Simulation of biological systems and analysis of error metric effects on model fitting
… these fields have been complemented by dynamic simulations of developmental signaling and genetic interactions. Models provide means to evaluate "emergent" properties of systems sometimes inaccessible by reductionist approaches, making them test beds for biological inference and technological …
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Advancements in the Design and Development of CubeSat Attitude Determination and Control Testing at the Virginia Tech Space Systems Simulation Laboratory
… to test and validate spacecraft attitude control systems before flight. However, these systems are generally too large to successfully test the attitude control systems on-board CubeSat-class satellites. Due to their low cost and rapid development time, CubeSats have become an increasingly popular …
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Fixed-Priority Scheduling of Periodic Tasks With End-to-End Deadlines
… contention problem in distributed real-time systems. Simulation results show that the end-to-end scheduling approach performs better in many cases than an existing approach, known as the Multiprocessor Priority Ceiling Protocol. In the appendix, the thesis includes an in-depth discussion of …
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A Custom Computing Machine Solution for Simulation of Discretized Domain Physical Systems
… of a two-dimensional heat transfer simulation system using a Splash-2 Custom Computing Machine (CCM). This application was implemented as a proof of concept for utilizing CCMs in the simulation of physical systems. This paper discusses physical systems simulation and the need for …
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Tomographic processing of synthetic aperture radar signals for enhanced resolution
… transmitted signal (impulse) and a sensible simulation. Image reconstruction algorithms are developed for monostatic and bistatic systems. Simulation results using these algorithms compare favorably with baseline simulations which use a more conventional algorithm operating on data which do …
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Optimizing underground, trackless loading and hauling systems
… problem which was dealt with in this research by systems simulation. The computer program developed by the Caterpillar Tractor Company served as the starting point for simulating the equipment's capabilities to move material over a course in a prescribed time. Extensive time studies of the …
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Designing Low -Power Communication Systems via Noise-Tolerance
… bounds on energy dissipation of noisy digital systems. We compare the energy-efficiency bounds for domino and noise-tolerant dynamic circuits, and demonstrate that noise-tolerant techniques improve the energy-efficiency when operating at the lower bound. Furthermore, we show that the gap …
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Analysis of catchable trout fisheries management by computer simulation
… management strategies in complex resource systems, such as catchable trout fisheries, is systems simulation. A computer-implemented catchable trout fishery simulator (CATS) was developed to evaluate fishery response under various management strategies in a multi-species stocking program. …
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Development of a Model and Optimal Control Strategy for the Cal Poly Central Plant and Thermal Energy Storage System
… The model was developed using a transient systems simulation program (TRNSYS) that includes plant performance and manufacturer data for the primary system components, which are comprised of pumps, chillers, cooling towers, and a thermal energy storage tank. The model is calibrated to the …
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Use of Advance Demand Information in Inventory Management with Two Demand Classes
This work considers inventory systems with two demand classes, where advance demand information is available. Three related scenarios are presented: three-stage production-inventory systems are studied in first two, whereas pure inventory systems are studied in the last scenario. In the first …
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Evaluation Of The Impacts Of Its Information Strategies On I-4 Corridor
… information, and variable message signs. Simulation covered one hour during the morning peak period. The impacts of ITS information strategies on mobility were evaluated by simulating the performance of various ITS information components (pre-trip information, en-route information, and …
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Evaluation of uncertainty in dynamic, reduced-order power system models
… analyze increasingly complex behavior in power systems, simulation techniques are gaining importance and prevalence. However, while simulations of large, interconnected power systems are feasible, they remain time-consuming. Additionally, the models and parameters used in simulations are …
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Modelling and control of dieless wire drawing.
… <p>A self-tuning controller for determinisic systems is proposed, which has the same structure as a conventional PID controller. The new self-tuning PID controller is based on a generalised self-tuning controller with pole assignment for deterministic systems. Simulation and experimental …
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A multiple objective approach to evaluate economic and environmental impacts of agricultural management systems from a sustainable development perspective
This dissertation develops a systems theory perspective of the concept of sustainable development, and explores a systematic approach to employ this concept to an economic analysis. An examination of interpretations, foundations and the framework of the concept of sustainable development is …
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