Dissertations / Theses on the topic 'Electronic and Computer System Engineering'
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McKnight, Walter Lee. "A meta system for generating software engineering environments /." The Ohio State University, 1985. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487260531958418.
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Ahmed, Nuredin Ali Salem. "System level modelling and design of hypergraph based wireless system area networks for multi-computer systems." Thesis, University of Glasgow, 2011. http://theses.gla.ac.uk/2559/.
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This thesis deals with issues pertaining the wireless multicomputer interconnection networks namely topology and Medium Access Control (MAC). It argues that new channel assignment technique based on regular low-dimensional hypergraph networks, the dual radio wireless hypermesh, represents a promising alternative high-performance wireless interconnection network for the future multicomputers to shared communication medium networks and/or ordinary wireless mesh networks, which have been widely used in current wireless networks. The focus of this work is on improving the network throughput while maintaining a relatively low latency of a wireless network system. By means of a Carrier Sense Multiple Access (CSMA) based design of the MAC protocol and based on the desirable features of hypermesh network topology a relatively high performance network has been introduced. Compared to the CSMA shared communication channel model, which is currently the de facto MAC protocol for most of wireless networks, our design is shown to achieve a significant increase in network throughput with less average network latency for large number of communication nodes. SystemC model of the proposed wireless hypermesh, validated through mathematical models, are then introduced. The analysis has been incorporated in the proper SystemC design methodology which facilitates the integration of communication modelling into the design modelling at the early stages of the system development. Another important application of SystemC modelling techniques is to perform meaningful comparative studies of different protocols, or new implementations to determine which communication scenario performs better and the ability to modify models to test system sensitivity and tune performance. Effects of different design parameters (e.g., packet sizes, number of nodes) has been carried out throughout this work. The results shows that the proposed structure has out perform the existing shared medium network structure and it can support relatively high number of wireless connected computers than conventional networks.
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Fröberg, Joakim. "Engineering Automotive Electronic Systems: Decision Support for Successful Integration." Doctoral thesis, Mälardalen University, Department of Computer Science and Electronics, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-459.
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The electronic system of a modern vehicle is essential to achieve a successful automotive product. Vehicle development is performed by integrating components that include embedded electronics from several suppliers.
This thesis present results on the subject of integration of automotive electronic systems. Our studies aim at providing knowledge on how to integrate automotive electronic systems successfully in a setting where vehicles are developed based on existing platforms. We focus on early phases of automotive electronic system development and in particular on the decisions taken in integration of electronic sub-systems. The contribution is the presented support for making decisions to successfully integrate electronic systems for modern vehicles. The contribution includes an overview of driving factors of automotive electronics system design, a validated set of success practices for the integration of electronic components, and the proposal and demonstration of a decision model. The influential factors and the validated set of practices stems from case studies of products and projects while the proposed decision model is a result of combining two general models for architecture analysis and decision making, ATAM and AHP.
We demonstrate that choices in strategy and design preceding integration are central to achieve a successful integration. Our studies show that problems arise from omitted strategy decisions and we provide a checklist for decision making in the areas; functionality, platform, integration design, and assigning responsibilities. We provide a recommendation that we validate in a multiple cases study where fulfillment of recommendations is demonstrated to affect project success in integration projects.
The potential gain for OEMs using our results lies in achieving more solid foundations for design decisions. Designers and managers could potentially find central decisions on integration strategy early that, if omitted, could cause delays. Thus, applying the result could avoid pitfalls and enable successful integration projects.
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Liburd, Soyini (Soyini Denise) 1980. "An N-version electronic voting system." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/28441.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2004.Includes bibliographical references (p. 103-109).
The ballot battles of the 2000 US Presidential Election clearly indicate that existing voting technologies and processes are not sufficient to guarantee that every eligible voter is granted their right to vote and implicitly to have that vote counted, as per the fifteenth, nineteenth, twenty fourth and twenty sixth amendments to the US constitution [1-3]. Developing a voting system that is secure, correct, reliable and trustworthy is a significant challenge to current technology [3, 4]. The Secure Architecture for Voting Electronically (SAVE) demonstrates that N-version programming increases the reliability and security of its systems, and can be used to increase the trustworthiness of systems. Further, SAVE demonstrates how a viable practical approach to voting can be created using N-version programming. SAVE represents a significant contribution to voting technology research because of its design, and also because it demonstrates the benefits of N-version programming and introduces these benefits to the field of voting technology.
by Soyini D. Liburd.
M.Eng.
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Li, Dong. "Physics- and engineering knowledge-based geometry repair system for robust parametric CAD geometries." Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/348924/.
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In modern multi-objective design optimisation, an effective geometry engine is becoming an essential tool and its performance has a significant impact on the entire process. Building a parametric geometry requires difficult compromises between the conflicting goals of robustness and flexibility. The work presents a solution for improving the robustness of parametric geometry models by capturing and modelling relative engineering knowledge into a surrogate model, and deploying it automatically for the search of a more robust design alternative while keeping the original design intent. Design engineers are given the opportunity to choose from a list of optimised designs to balance the robustness of the geometry and the original design intent. The prototype system is firstly tested on a 2D intake design repair example and shows the potential to reduce the reliance on human design experts in the conceptual design phase and improve the stability of the optimisation cycle. It also helps speed up the design process by reducing the time and computational power that could be wasted on flawed geometries or frequent human interferences. A case-study of the proposed repair system based on the design and analysis of a three-dimensional parametric turbine blade model has been set up. An automatic analysis workflow is set up and the results are summarised for setting up a repair database based on surrogate training methods. Positive repair results have been achieved and an automatic repair cycle for the blade model is being set up and tested. The proposed physics and engineering knowledge based geometry repair system for robust parametric geometries proves an effective tool for ensuring automation robustness and design flexibility.
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Heath, David M. "The Use of Electronic Meeting System Technology to Aid in Software Requirements Engineering." NSUWorks, 1998. http://nsuworks.nova.edu/gscis_etd/577.
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Software developers and users do not, in many cases, work efficiently and effectively together to elicit and agree on software requirements. A different approach to requirement elicitation and approval is proving extremely successful in industry. This approach uses a methodology and technique called Joint Application Development (JAD). JAD is both a team-technique and a methodology that emphasizes structure, a detailed agenda, and an active, trained facilitator.
In recent years, there has been a growing interest in the use of information technology to support group work. Electronic meeting system (EMS) technology, a specific type of group support system, has evolved since the early 1980s to address the need to provide computer support to work groups. This research study hypothesizes that the union of EMS technology with IAO-like meetings addressing a complex task such as software requirement elicitation will result in improved efficiency and effectiveness, higher quality decisions, greater member satisfaction, and improved consensus. Because testing these hypotheses using a controlled software project is impractical, data synthesis (meta-analysis) techniques were applied to the results from 180 historical laboratory experiments and field studies that examined EMS to support group decision-making. Results were grouped for analysis by research setting and by outcome variable (efficiency, effectiveness, quality, satisfaction and consensus).
The results confirm that EMS technology improves group decision-making efficiency and effectiveness, results in higher quality decisions and greater member satisfaction, and improves the process for obtaining consensus in both laboratory and field research settings. The composite field study’s effects were 1 y, to 3 times more significant than those from laboratory experiments. The results support the widely held research premise that historical laboratory and field results are not inconsistent but rather reflect different research situations. In this study, the laboratory findings were categorized to reflect treatments similar to those in field studies (medium to large size groups, medium to difficult tasks); the resulting outcomes were consistent. Because of this consistency of effect between controlled laboratory and field study results, the credibility and generalizability of historical field study outcomes is considerably strengthened.
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Geerdts, C. D. "SOFTWIRE : an interactive, computer-based system for enhancing learning in electrical engineering using simulation." Master's thesis, University of Cape Town, 1987. http://hdl.handle.net/11427/8364.
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The aim of the dissertation is to explore a method of enhancing learning in the Electrical Engineering curriculum, which effectively exploits the computer. The different modes used in computer-based learning are discussed and compared, and the conclusion reached that simulation provides the best basis for a learning enhancement system. It has the ability to facilitate demonstration of basic concepts, learning of estimation, modular system design, and the use of models in engineering, and group work. It is a useful complement to laboratory work. It also enhances motivation and interest. A system is motivated loosely based on the architecture of the analogue computer, but tailored for an educational environment by being interactive, simple-to-use, adaptable and extendable by the tutor, and carrying a wide variety of educationally valuable inbuilt functions. The system proposed, SOFTWIRE, consists of a software package, a hardware laboratory interface as well as a broad approach to strategy, based on basic Learning Theory. Design issues relating to the hardware, software, and implementation of pedagogic strategy are discussed. Some examples of the use of the system are given. Thus both the broad and specific approach are covered. Some of the modes of useage discussed are demonstrations, design problems involving the construction of simulations in SOFTWIRE's language, interacting with simulations to experience them and to see the effects of parameter and structure changes, and learning about modelling and its relation to the real world. Evaluation is discussed, especially in relation to SOFTWIRE. Conclusions are drawn, and suggestions made about future development of the SOFTWIRE system, as well as relevant trends in computer education.
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Jun, Yong-Tae. "A feature-based reverse engineering system using artificial neural networks." Thesis, University of Warwick, 1999. http://wrap.warwick.ac.uk/3674/.
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Reverse Engineering (RE) is the process of reconstructing CAD models from scanned data of a physical part acquired using 3D scanners. RE has attracted a great deal of research interest over the last decade. However, a review of the literature reveals that most research work have focused on creation of free form surfaces from point cloud data. Representing geometry in terms of surface patches is adequate to represent positional information, but can not capture any of the higher level structure of the part. Reconstructing solid models is of importance since the resulting solid models can be directly imported into commercial solid modellers for various manufacturing activities such as process planning, integral property computation, assembly analysis, and other applications. This research discusses the novel methodology of extracting geometric features directly from a data set of 3D scanned points, which utilises the concepts of artificial neural networks (ANNs). In order to design and develop a generic feature-based RE system for prismatic parts, the following five main tasks were investigated. (1) point data processing algorithms; (2) edge detection strategies; (3) a feature recogniser using ANNs; (4) a feature extraction module; (5) a CAD model exchanger into other CAD/CAM systems via IGES. A key feature of this research is the incorporation of ANN in feature recognition. The use of ANN approach has enabled the development of a flexible feature-based RE methodology that can be trained to deal with new features. ANNs require parallel input patterns. In this research, four geometric attributes extracted from a point set are input to the ANN module for feature recognition: chain codes, convex/concave, circular/rectangular and open/closed attribute. Recognising each feature requires the determination of these attributes. New and robust algorithms are developed for determining these attributes for each of the features. This feature-based approach currently focuses on solving the feature recognition problem based on 2.5D shapes such as block pocket, step, slot, hole, and boss, which are common and crucial in mechanical engineering products. This approach is validated using a set of industrial components. The test results show that the strategy for recognising features is reliable.
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Collins, Jill. "Modelling tribology of slider and disk in a computer hard drive system." Thesis, Aston University, 2001. http://publications.aston.ac.uk/7995/.
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Issues of wear and tribology are increasingly important in computer hard drives as slider flying heights are becoming lower and disk protective coatings thinner to minimise spacing loss and allow higher areal density. Friction, stiction and wear between the slider and disk in a hard drive were studied using Accelerated Friction Test (AFT) apparatus. Contact Start Stop (CSS) and constant speed drag tests were performed using commercial rigid disks and two different air bearing slider types. Friction and stiction were captured during testing by a set of strain gauges. System parameters were varied to investigate their effect on tribology at the head/disk interface. Chosen parameters were disk spinning velocity, slider fly height, temperature, humidity and intercycle pause. The effect of different disk texturing methods was also studied. Models were proposed to explain the influence of these parameters on tribology. Atomic Force Microscopy (AFM) and Scanning Electron Microscopy (SEM) were used to study head and disk topography at various test stages and to provide physical parameters to verify the models. X-ray Photoelectron Spectroscopy (XPS) was employed to identify surface composition and determine if any chemical changes had occurred as a result of testing. The parameters most likely to influence the interface were identified for both CSS and drag testing. Neural Network modelling was used to substantiate results. Topographical AFM scans of disk and slider were exported numerically to file and explored extensively. Techniques were developed which improved line and area analysis. A method for detecting surface contacts was also deduced, results supported and explained observed AFT behaviour. Finally surfaces were computer generated to simulate real disk scans, this allowed contact analysis of many types of surface to be performed. Conclusions were drawn about what disk characteristics most affected contacts and hence friction, stiction and wear.
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McWhorter, Tanner Maxwell. "Cognitive Electronic Warfare System." Miami University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=miami1595708553000249.
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Chen, Weiwei. "Out-of-order Parallel Discrete Event Simulation for Electronic System-Level Design." Thesis, University of California, Irvine, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3597427.
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The large size and complexity of the modern embedded systems pose great challenges to design and validation. At the so called electronic system level (ESL), designers start with a specification model of the system and follow a systematic top-down design approach to refine the model to lower abstraction levels step-by-step by adding implementation details. ESL models are usually written in C-based System-level Description Languages (SLDLs), and contain the essential features, such as clear structure and hierarchy, separate computation and communication, and explicit parallelism. The validation of ESL models typically relies on simulation. Fast yet accurate simulation is highly desirable for efficient and effective system design.
In this dissertation, we present out-of-order parallel discrete event simulation (OoO PDES), a novel approach for efficient validation of system-level designs by exploiting the parallel capabilities of todays multi-core PCs for system level description languages. OoO PDES breaks the global simulation-cycle barrier of traditional DE simulation by localizing the simulation time into each thread, carefully delivering notified events, and handling a dynamic management of simulation sets. Potential conflicts caused by parallel accesses to shared variables and out-of-order thread scheduling are prevented by an advanced predictive static model analyzer in the compiler. As such, OoO PDES allows the simulator to effectively exploit the parallel processing capability of the multi-core system to achieve fast speed simulation without loss of simulation and timing accuracy.
We perform simulation experiments on both highly parallel benchmark examples and real-world embedded applications, including a JPEG image encoder, an edge detector, a MP3 audio decoder, a H.264 video decoder, and a H.264 video encoder. Experimental results show that our approach can achieve significant simulation speedup on multi-core simulation hosts with negligible compilation cost.
Based on our parallel simulation infrastructure, we then propose a tool flow for dynamic race condition detection to increase the observability for parallel ESL model development. This helps the designer to quickly narrow down the debugging targets in faulty ESL models with parallelism. This approach helps to reveal a number of risky race conditions in our in- house embedded multi-media application models and enabled us to safely eliminate these hazards. Our experimental results also show very little overhead for race condition diagnosis during compilation and simulation.
Overall, our work provides an advanced parallel simulation infrastructure for efficient and effective system-level model validation and development. It helps embedded system designers to build better products in shorter time.
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Guo, Yue. "An investigation of model-based techniques for automotive electronic system development." Thesis, University of Warwick, 2009. http://wrap.warwick.ac.uk/3722/.
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Over the past decades, the adoption of electronic systems for the manufacturing of automotive vehicles has been exponentially popularized. This growth has been driven by the premium automobile sector where, presently, diverse electronic systems are used. These electronic systems include systems that control the engine, transmission, suspension and handling of a vehicle; air bag and other advanced restraint systems; comfort systems; security systems; entertainment and information (infotainment) systems. In systems terms, automotive embedded electronic systems can now be classified as a System of Systems (SoS). Automotive systems engineering requires a sustainable integration of new methods, development processes, and tools that are specifically adapted to the automotive domain. Model-based design is one potential methodology to carry out design, implement and manage such complex distributed systems, and their integration into one cohesive and reliable SoS to meet the challenges for the automotive industry. This research was conducted to investigate the model-based design of a 4×4 Information System, within an automotive electronic SoS. Two distinct model-based approaches to the development of an automotive electronic system are discussed in this study. The first approach involves the use of the Systems Modelling Language (SysML) based tool ARTiSAN Studio for structural modelling, functional modelling and code generation. The second approach involves the use of the MATLAB based tools Simulink and Stateflow for functional modelling, and code generation. The results show that building the model in SysML by using ARTiSAN Studio provides a clearly structured visualization of the 4×4 Information System from both structural and behavioural viewpoints of the system with relevant objects. SysML model facilitates a more comprehensive understanding of the system than the model built in Simulink/Stateflow. The Simulink/Stateflow model demonstrates its superior performance in producing high quality and better efficiency of C code for the automotive software delivery compared with the model built in ARTiSAN Studio. Furthermore, this Thesis also gets insight into an advanced function development approach based on the real-time simulation and animation for the 4×4 Information System. Finally, the Thesis draws conclusions about how to make use of model-based design for the development of an automotive electronic SoS.
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Wong, Jessica Y. A. (Jessica Yien Ai) 1976. "An integrated system for measuring spectra of electronic flash sources." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/86563.
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Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.Includes bibliographical references (p. 43).
by Jessica Y.A. Wong.
S.B.and M.Eng.
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Schindler, Jiri. "Learning the structure and content of an electronic medical record system." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/42784.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.Includes bibliographical references (p. 104-107).
by Jiri Schindler.
M.Eng.
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Mostert, Sias. "The transputer virtual memory system." Thesis, Stellenbosch : Stellenbosch University, 1990. http://hdl.handle.net/10019.1/69047.
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Thesis (MIng.)--Stellenbosch University, 1990.ENGLISH ABSTRACT: The transputer virtual memory system provide, for the transputer without memory management primitives, a viable virtual memory system. This report evaluates the architecture and its parameters. The basic software is also implemented a.nd described. The disk subsystem with software and hard",,'are is also evaluated in a single disk environment. It is shown that the unique features of the TVM system has advantages and disadvantages when compared to conventional virtual memory systems. One of the advantages is that a conventional operating system with memory protection can now also be implemented on the transputer. The main conclusion is that this is a performance effective implementation of a virtual memory system with unique features that should be exploited further.
AFRIKAANSE OPSOMMING: Die transputer virtuele geheue verskaf, vir 'n verwerker sander virtuele geheue ondersteuning, 'n doeltreffende virtuele geheue stelsel. Die verslag evalueer die argitektuur en sy parameters. Die skyfsubstelsel met programmatuur en apparatuur word ook geevalueer in 'n enkel skyfkoppelvlak omgewing. Daar word bewys dat die upieke eienskappe van die TVG (transputer virtuele geheue) voor- en nadele besit wanneer dit vElrgelyk word met konvensionele virtuele geheue stelsels. Een van die voordele is dat 'n konvensionele bedryfstelsel met geheue beskerming nou op 'n transputer ge-implementeer kan word. Die hoofnadeel agv die spesifieke argitektuur gee slegs 'n 15% degradering in werkverrigting. Dit word egter slegs oar 'n sekere datagrootte ervaar en kom tipies nie ter sprake wanneer daar massiewe programme geloop word nie.
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Simpson, Andrew J. R. "Selectivity and adaptation in the human auditory system." Thesis, Queen Mary, University of London, 2014. http://qmro.qmul.ac.uk/xmlui/handle/123456789/9112.
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Two fundamental principles dominate the signal processing of the auditory system: selectivity and adaptation. The response of the auditory system is selective for various acoustic features and the representation of these acoustic features adapts over time. This thesis is concerned with the characterisation of selectivity and adaptation in the human auditory system. Initially, selectivity for modulation rate and adaptation to intensity are characterised in a central auditory model. Next, selectivity for temporalmodulation rate and selective adaptation to both intensity and temporal modulation rate are characterised in psychophysical data.
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Theron, Pieter. "Distributed control system network for an electrostatic roll separator." Thesis, Stellenbosch : University of Stellenbosch, 2006. http://hdl.handle.net/10019.1/2709.
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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2006.The distributed control system network involves analog data acquisition nodes interconnected through CAN and USB protocol interfaces to form a network. The network is designed to be generically applicable to various control problems. This network of controllers was specifically utilised on a scaled-down electrostatic roll separator plant used in the mineral processing industry. A SISO and a MIMO regulator was designed to demonstrate the regulation of plant parameters. The MIMO regulator was employed in a scheme that optimises the plant yield automatically. Analog data acquisition nodes were designed and built especially for the purposes of this project. These nodes were installed on the electrostatic roll separator plant. PC based application software was written so that plant ID experiments could be performed. SISO and MIMO regulators along with a yield optimising scheme was designed and implemented in the application software. Both SISO and MIMO regulators successfully regulated plant outputs. The nonconducting mineral product grade was regulated by the SISO regulator. The non-conducting mineral product grade and conductor mineral mass flow was regulated by the MIMO regulator. The yield optimiser successfully employed the MIMO regulator to optimise the plant yield automatically.
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Xin, Zhang. "Distributed Electronic Health Record System based on Middleware." Thesis, Mittuniversitetet, Institutionen för informationsteknologi och medier, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-18947.
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With the fast development of information technology, traditional healthcare is evolving to a more digital and electronic stage. Electronic HealthRecord (EHR) is residents’ basic information and health care relatedinformation conforming to standard. It can not only provide usefulinformation to medical workers, but also exchange resources with otherinformation systems. But with the growing complexity of electronichealth record data sources, it becomes a big challenge to set up a structurewhich allows different types of data sharing and exchanging inmulti-platform applications. It’s even more important to find out amethod to support great amount of users from different applicationplatform to sharing and exchanging data at the same time.In this paper, we proposed a distributed electronic health record systembased on middleware to address the problem. Both permanent and realtimedata should pass through the middleware provided by the system,and will be transformed into standard format for storage. Multi-threadand distributed server group design will let the system be more flexibleand scalable, and will be able to provide service to users concurrently.The system creates a standard data format for data transferring andstorage. All raw data collected from different kinds of sensor system willbe formatted with application programming interface (API) or softwaredevelopment kit (SDK) system provided before upload to the system.Encryption methods are also implemented to ensure data security andprivacy protection.
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Ma, Xiao. "Ontology engineering for ICT systems using semantic relationship mining and statistical social network analysis." Thesis, University of Warwick, 2011. http://wrap.warwick.ac.uk/63881/.
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In information science, ontology is a formal representation of knowledge as a set of concepts within a domain, and the relationships between those concepts. It is used to reason about the entities within that domain, and may be used to describe the domain. (Wikipedia, 2011) This research takes two case study ICT applications in engineering and medicine, and evaluates the applications and supporting ontology to identify the main requirements for ontology in ICT systems. A study of existing ontology engineering methodology revealed difficulties in generating sufficient breadth and depth in domain concepts that contain rich internal relationships. These restrictions usually arise because of a heavy dependence on human experts in these methodologies. This research has developed a novel ontology engineering methodology – SEA, which economically, quickly and reliably generates ontology for domains that can provide the breadth and depth of coverage required for automated ICT systems. Normally SEA only requires three pairs of keywords from a domain expert. Through an automated snowballing mechanism that retrieves semantically related terms from the Internet, ontology can be generated relatively quickly. This mechanism also enhances and enriches the binary relationships in the generated ontology to form a network structure, rather than a traditional hierarchy structure. The network structure can then be analysed through a series of statistical network analysis methods. These enable concept investigation to be undertaken from multiple perspectives, with fuzzy matching and enhanced reasoning through directional weight-specified relationships. The SEA methodology was used to derive medical and engineering ontology for two existing ICT applications. The derived ontology was quicker to generate, relied less on expert contribution, and provided richer internal relationships. The methodology potentially has the flexibility and utility to be of benefit in a wide range of applications. SEA also exhibits "reliability" and "generalisability" as an ontology engineering methodology. It appears to have application potential in areas such as machine translation, semantic tagging and knowledge discovery. Future work needs to confirm its potential for generating ontology in other domains, and to assess its operation in semantic tagging and knowledge discovery.
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Fu, Jingsong. "ParPlum : a system for evaluating parallel program optimization methods." PDXScholar, 1991. https://pdxscholar.library.pdx.edu/open_access_etds/4177.
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The diversity of application programs and parallel architectures makes the mapping problem complicated and hard to evaluate. The quality of mapping is machine and application dependent and varies due to inaccurate values of application and architecture characteristics.
A system for developing, applying and evaluating mappings must have four characteristics: (1) Simplicity: A mapping procedure can be evaluated by separately evaluating its submapping, so the complicated problem can be simplified. (2) Generality: A wide range of application programs and architectures can be easily represented and all mapping algorithms can be easily implemented. (3) Multifunctionality: all the mapping steps, application programs, target architectures, and related cost functions can vary and are easy to evaluate. (4) Ability for the sensitivity analysis: The sensitivity of mapping quality to the inaccuracy of cost functions and characteristics of applications and architectures can be easily tested.
ParPlum, which is presented in this thesis, is aimed at creating and evaluating mappings on different parallel architectures with different application programs. Sensitivity analysis is another major focus. The design philosophy of ParPlum is to narrow down the multidimensional optimization problem into sub-problems with one or fewer dimensions. Mapping, for example, can be divided into three submappings, partitioning, allocating, and scheduling. This leads to the implementation of the ParPlum system, the use of data flow style, the distribution of ParPlum libraries, and the development of the ParPlum pipeline.
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Mohd, Anuar Fatahiyah. "Trade mark similarity assessment support system." Thesis, Cardiff University, 2014. http://orca.cf.ac.uk/73369/.
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Trade marks are valuable intangible intellectual property (IP) assets with potentially high reputational value that can be protected. Similarity between trade marks may potentially lead to infringement. That similarity is normally assessed based on the visual, conceptual and phonetic aspects of the trade marks in question. Hence, this thesis addresses this issue by proposing a trade mark similarity assessment support system that uses the three main aspects of trade mark similarity as a mechanism to avoid future infringement. A conceptual model of the proposed trade mark similarity assessment support system is first proposed and developed based on the similarity assessment criteria outlined in a trade mark manual. The proposed model is the first contribution of this study, and it consists of visual, conceptual, phonetic and inference engine modules. The second contribution of this work is an algorithm that compares trade marks based on their visual similarity. The algorithm performs a similarity assessment using content-based image retrieval (CBIR) technology and an integrated visual descriptor derived using the low-level image feature, i.e. the shape feature. The performance of the algorithm is then assessed using information retrieval based measures. The obtained result demonstrates better retrieval performance in comparison to the state of the art algorithm. The conceptual aspect of trade mark similarity is then examined and analysed using a proposed algorithm that employs semantic technology in the conceptual module. This contribution enables the computation of the conceptual similarity between trade marks, with the utilisation of an external knowledge source in the form of a lexical ontology, together with natural language processing and set similarity theory. The proposed algorithm is evaluated using both information VI retrieval and human collective opinion measures. The retrieval result produced by the proposed algorithm outperforms the traditional string similarity comparison algorithm in both measures. The phonetic module examines the phonetic similarity of trade marks using another proposed algorithm that utilises phoneme analysis. This algorithm employs phonological features, which are extracted based on human speech articulation. In addition, the algorithm also provides a mechanism to compare the phonetic aspect of trade marks with typographic characters. The proposed algorithm is the fourth contribution of this study. It is evaluated using an information retrieval based measure. The result shows better retrieval performance in comparison to the traditional string similarity algorithm. The final contribution of this study is a methodology to aggregate the overall similarity score between trade marks. It is motivated by the understanding that trade mark similarity should be assessed holistically; that is, the visual, conceptual and phonetic aspects should be considered together. The proposed method is developed in the inference engine module; it utilises fuzzy logic for the inference process. A set of fuzzy rules, which consists of several membership functions, is also derived in this study based on the trade mark manual and a collection of trade mark disputed cases is analysed. The method is then evaluated using both information retrieval and human collective opinion. The proposed method improves the retrieval accuracy and the experiment also proves that the aggregated similarity score correlates well with the score produced from human collective opinion. The evaluations performed in the course of this study employ the following datasets: the MPEG-7 shape dataset, the MPEG-7 trade marks dataset, a collection of 1400 trade marks from real trade mark dispute cases, and a collection of 378,943 company names.
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She, Chang. "A natural interaction reasoning system for electronic circuit analysis in an educational setting." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/37071.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2006.Includes bibliographical references (p. 42).
This thesis presents a sketch-based interaction system that can be used to illustrate the process of reasoning about an electrical circuit in an educational setting. Recognition of hand-drawn shapes is accomplished in a two stage process where strokes are first processed into primitives like lines or ellipses, then combined into the appropriate circuit device symbols using a shape description language called LADDER. The circuit is then solved by a constraint-propagation reasoning component. The solution is shown to the user along with the justifications that support each deduction. The level of detail and the speed of the solution playback can be customized to tailor to a student's particular learning pace. A small user study was conducted to test the performance of the recognition component, which revealed several recognition problems common to almost all of the users' experiences with the system. Suggestions for dealing with these problems are also presented.
by Chang She.
M.Eng.
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Human, TM. "The design and development of a microprocessor based control system for an electric rail transport system." Thesis, Cape Technikon, 1988. http://hdl.handle.net/20.500.11838/1121.
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Thesis (Masters Diploma (Technology) Cape Technikon, 1988Radioactivity and radioactive radiation are two scientific phenomena which man has always approached with great caution, if not fear. Radioactive radiation cannot be sensed by any of the human senses and experience has proved just how hazardous it can be to the human body. This caution is therefore by no means unfounded and through the years a set of standards has been derived as to what can be regarded as a safe dose to the human body. At the National Accelerator Centre radioisotopes are being produced by a chemical recovery process from targets which have been irradiated by a high energy proton beam. Targets are prepared by compressing salts, containing the elements to become radioisotopes, into tablets. The high energy protons collide with particles in the targets which give off radioactive radiation. The targets in their turn become radioactive and the isotopes that are produced from these targets are radioactive. The level of radioactive radiation is extremely hazardous and it is therefore impossible for any human being to come into close contact with any of the targets or isotopes. It is for these reasons that an electrical rail transport system was installed at the National Accelerator Centre to transport highly radioactive sources. The transport system links the two irradiation vaults to the two rows of hot cells, where the chemical recovery takes place, and to a well shielded storage area for storage of isotopes and radioactive waste. A transport system, performing tasks of this nature, must be, above all, extremely reliable. Secondly, commands entered by an operator to control the system, must be simple and straight forward. This thesis describes the control of the transport system at the National Accelerator Centre, including alI of its features, advantages and disadvantages.
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Elhabbash, Abdessalam. "Engineering self-awareness with knowledge management in dynamic systems : a case for volunteer computing." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7696/.
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The complexity of the modem dynamic computing systems has motivated software engineering researchers to explore new sources of inspiration for equipping such systems with autonomic behaviours. Self-awareness has recently gained considerable attention as a prominent property for enriching the self-adaptation capabilities in systems operating in dynamic, heterogeneous and open environments. This thesis investigates the role of knowledge and its dynamic management in realising various levels of self-awareness for enabling selfadaptivity with different capabilities and strengths. The thesis develops a novel multi-level dynamic knowledge management approach for managing and representing the evolving knowledge. The approach is able to acquire 'richer' knowledge about the system's internal state and its environment in addition to managing the trade-offs arising from the adaptation conflicting goals. The thesis draws on a case from the volunteer computing, as an environment characterised by openness, heterogeneity, dynamism, and unpredictability to develop and evaluate the approach. This thesis takes an experimental approach to evaluate the effectiveness of the of the dynamic knowledge management approach. The results show the added value of the approach to the self-adaptivity of the system compared to classic selfadaptation capabilities.
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Sardesai, Shailesh. "On reliability estimation of large electronic systems." Ohio : Ohio University, 1997. http://www.ohiolink.edu/etd/view.cgi?ohiou1177012132.
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Altas, Daghan S. "System level design with systemC." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=30781.
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In this thesis, we provide a system level design methodology aimed for the design of embedded systems. Our methodology is geared towards the concurrent design of hardware components and software agents. Our choice of tool/language pair is CoWare N2C design tool and SystemC specification language. Our design flow is completed with a high performance hardware synthesis methodology relying behavioral synthesis. A case study, the design of an ATM switch, is carried out to illustrate the proposed ideas.
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Bersch, Sebastian Dominik. "Artificial immune system for the detection of abnormal activity in ambient assisted living." Thesis, University of Portsmouth, 2014. https://researchportal.port.ac.uk/portal/en/theses/artificial-immune-system-for-the-detection-of-abnormal-activity-in-ambient-assisted-living(d9c60c16-d797-42ea-a6c0-ccd80f59acc4).html.
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This thesis is concerned with the use of Artificial Immune System (AIS)in the area of Ambient Assisted Living (AAL). The hypothesis for the work presented herein is that the AIS features of self-learning and adaptability address the complex problem of improving the detection of unknown abnormal; behaviour in the long-term monitoring of the elderly. The work presents and affordable Open Hardware Data Acquisition Device that in combination with a Markov chain-based software simulation environment can be used for the collection of human activity data and the generation of necessary information for long-term simulation. The main contributions from the work presented herein relate to the design and use of AIS based solutions, and the selection of appropriate parameter combinations for supervised classifiers. Firstly, a novel seeding technique for AIS is presented that improves the placement of detectors in the search space. Secondly, a novel AIS-based monitoring algorithm, inspired by Hierarchical Temporal Memory architecture, is designed to learn and approximate sensor data to detect and report activity abnormalities. Thirdly, an empirical analysis is carried out to provide a clear understanding of how sampling frequency, segmentation method, window size, and computational load in an area of AAL. Fourthly, a Pareto curve based technique has been devised and demonstrated as a useful tool for the informed selection of parameter combinations to achieve the best possible classification accuracy and computational load. The evaluation of the AIS-based algorithm showed that the detection rate of abnormal activity outperformed the results of supervised classifiers with parameter combinations selected based on the Pareto curve. The results are encouraging and support the decision to introduce the use of AIS for the detection of abnormal activity in AAL environments.
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Luo, Weizhi. "An intelligent radio access network selection and optimisation system in heterogeneous communication environments." Thesis, Queen Mary, University of London, 2010. http://qmro.qmul.ac.uk/xmlui/handle/123456789/544.
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The overlapping of the different wireless network technologies creates heterogeneous communication environments. Future mobile communication system considers the technological and operational services of heterogeneous communication environments. Based on its packet switched core, the access to future mobile communication system will not be restricted to the mobile cellular networks but may be via other wireless or even wired technologies. Such universal access can enable service convergence, joint resource management, and adaptive quality of service. However, in order to realise the universal access, there are still many pending challenges to solve. One of them is the selection of the most appropriate radio access network. Previous work on the network selection has concentrated on serving the requesting user, but the existing users and the consumption of the network resources were not the main focus. Such network selection decision might only be able to benefit a limited number of users while the satisfaction levels of some users are compromised, and the network resources might be consumed in an ineffective way. Solutions are needed to handle the radio access network selection in a manner that both of the satisfaction levels of all users and the network resource consumption are considered. This thesis proposes an intelligent radio access network selection and optimisation system. The work in this thesis includes the proposal of an architecture for the radio access network selection and optimisation system and the creation of novel adaptive algorithms that are employed by the network selection system. The proposed algorithms solve the limitations of previous work and adaptively optimise network resource consumption and implement different policies to cope with different scenarios, network conditions, and aims of operators. Furthermore, this thesis also presents novel network resource availability evaluation models. The proposed models study the physical principles of the considered radio access network and avoid employing assumptions which are too stringent abstractions of real network scenarios. They enable the implementation of call level simulations for the comparison and evaluation of the performance of the network selection and optimisation algorithms.
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Tharf, Mohammed Saleh Hussein. "Computer modeling of electromagnetic interference, radiation, and crosstalk in electronic systems." Thesis, University of Ottawa (Canada), 1993. http://hdl.handle.net/10393/6693.
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A recently proposed edge-based finite element method (FEM) solution, for eigenvalue problems, is customized for deterministic bounded applications. The solution is then combined with asymptotic expansions of the fields scattered from an inhomogeneous object due to plane wave illumination. Moreover, the combination is modified to solve for radiation problems. The validity and accuracy of the formulations are demonstrated by comparison to other published data. Variety of applications are considered including the computation of the un-intentional radiation and crosstalk interference levels on printed circuit boards, penetration into shielding enclosures, and radar cross-section. The solution described is two-dimensional and the system matrix obtained is sparse (or banded) and symmetric. Further, the solution can be obtained directly without the need for matrix inversion. In addition, a three-dimensional hybrid numerical method is proposed. The method combines the edge-based FEM with the analytical solutions of arbitrary-large cavity with aperture. This hybrid method has the advantages of producing sparse matrix and substantially reducing the number of unknowns. Thus computer storage and processing time demands are reduced. The hybrid results are in agreement with the edge-based FEM solutions. Measurements also were performed and the results match well with the hybrid solution. The applications considered involve one of the problems that concern the EMI/C society, namely, the crosstalk on dielectric boards. Since the principal contribution of this dissertation is the development of hybrid numerical methods, one chapter is devoted to review the hybrid numerical methods.
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Siu, Weng In. "Smart card based electronic ticket management system." Thesis, University of Macau, 2001. http://umaclib3.umac.mo/record=b1447838.
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Ellis, Loftie. "Human-computer interface using a web camera." Thesis, Stellenbosch : University of Stellenbosch, 2007. http://hdl.handle.net/10019.1/1988.
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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2007.In this thesis we present a human-computer interface (HCI) system for disabled persons using only a basic web camera. Mouse movements are simulated by small movements of the head, while clicks are simulated by eye blinks. In this study, a system capable of face tracking, eye detection (including iris detection), blink detection and finally skin detection and face recognition has been developed. A detection method based on Haar-like features are used to detect the face and eyes. Once the eyes have been detected, a support vector machines classifier is used to detect whether the eye is open or closed (for use in blink detection). Skin detection is done using K-means clustering, while Eigenfaces is used for face recognition. It is concluded that using a web camera as a human-computer interface can be a viable input method for the severely disabled.
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Tassoudji, Mohammad Ali. "Electromagnetic interference in electronic circuits and systems." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/35392.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.Includes bibliographical references (p. 191-198).
by Mohammad Ali Tassoudji.
Ph.D.
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Sindle, Timothy Grant. "An autonomous, omnidirectional, digital, borehole imaging system." Thesis, Stellenbosch : Stellenbosch University, 2005. http://hdl.handle.net/10019.1/50260.
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Thesis (MScEng)--University of Stellenbosch, 2005.ENGLISH ABSTRACT: This thesis documents the research, design, implementation and successful testing of a prototype camera probe to survey the inside of hard rock boreholes. Rock core images are intended to aid mine geologists in recording the borehole rock layers. The system consists of a wide-angle fisheye lens mounted onto a CMOS digital image sensor. The image data is read in and processed by an FPGA, then stored on a removable sn flash memory card. All of the aforementioned components are mounted inside a watertight Perspex tube. Application specific PC software is used to process the data to form strip images of the borehole wall. Using mathematical correlation, these images are stitched together into a virtual core that is a flattened representation of the rock inside the borehole. The probe contains its own power and light source which enables it to be deployed easily with no external wires needed for operation. The storage capacity, image quality, and lighting design can be improved in future design revisions.
AFRIKAANSE OPSOMMING: Die inhoud van hierdie tesis behels die navorsmg, ontwerp, implementering, en suksesvolle toetsing van 'n prototipe kameraprobe wat dit moontlik maak om die binnewand van boorgate in harde rots te besigtig. Beelde van die rotskern vergemaklik die taak van myngeoloë wat die rotslae, waardeur die boorgat strek, moet opteken. Die stelsel behels 'n wyehoek bollens wat op 'n CMOS digitale sensor gemonteer is. Die data gewerf vir die vorming van die beeld word deur 'n FPGA ingelees en verwerk, waarna dit op 'n verwyderbare SD flits geheuekaart gestoor word. Die bogenoemde komponente word alles binne 'n waterdigte Perspexbuis monteer. Gebruikerspesifieke sagteware vir persoonlik rekenaars word gebruik om die data te verwerk en sodoende strookbeelde van die binnewand van die boorgat te vorm. Met gebruik van wiskundige korrelasie word hierdie beelde aan mekaar gelas om 'n virtuele kern te vorm, wat 'n voorstelling is van die rots binne die boorgat. Die probe bevat self krag en ligbronne, wat toelaat dat dit maklik bruikbaar is sonder enige eksterne bedrading. Toekomstige hersienings van die ontwerp sal verbeterde data geheue, beeldgehalte en beligting kan bewerkstellig.
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Viller, Stephen Alexandre. "Human factors in requirements engineering : a method for improving requirements processes for the development of dependable systems." Thesis, Lancaster University, 1999. http://eprints.lancs.ac.uk/11686/.
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Thompson, Keith R. "Implementation of gaussian process models for non-linear system identification." Thesis, University of Glasgow, 2009. http://theses.gla.ac.uk/1367/.
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This thesis is concerned with investigating the use of Gaussian Process (GP) models for the identification of nonlinear dynamic systems. The Gaussian Process model is a non-parametric approach to system identification where the model of the underlying system is to be identified through the application of Bayesian analysis to empirical data. The GP modelling approach has been proposed as an alternative to more conventional methods of system identification due to a number of attractive features. In particular, the Bayesian probabilistic framework employed by the GP model has been shown to have potential in tackling the problems found in the optimisation of complex nonlinear models such as those based on multiple model or neural network structures. Furthermore, due to this probabilistic framework, the predictions made by the GP model are probability distributions composed of mean and variance components. This is in contrast to more conventional methods where a predictive point estimate is typically the output of the model. This additional variance component of the model output has been shown to be of potential use in model-predictive or adaptive control implementations. A further property that is of potential interest to those working on system identification problems is that the GP model has been shown to be particularly effective in identifying models from sparse datasets. Therefore, the GP model has been proposed for the identification of models in off-equilibrium regions of operating space, where more established methods might struggle due to a lack of data. The majority of the existing research into modelling with GPs has concentrated on detailing the mathematical methodology and theoretical possibilities of the approach. Furthermore, much of this research has focused on the application of the method toward statistics and machine learning problems. This thesis investigates the use of the GP model for identifying nonlinear dynamic systems from an engineering perspective. In particular, it is the implementation aspects of the GP model that are the main focus of this work. Due to its non-parametric nature, the GP model may also be considered a ‘black-box’ method as the identification process relies almost exclusively on empirical data, and not on prior knowledge of the system. As a result, the methods used to collect and process this data are of great importance, and the experimental design and data pre-processing aspects of the system identification procedure are investigated in detail. Therefore, in the research presented here the inclusion of prior system knowledge into the overall modelling procedure is shown to be an invaluable asset in improving the overall performance of the GP model. In previous research, the computational implementation of the GP modelling approach has been shown to become problematic for applications where the size of training dataset is large (i.e. one thousand or more points). This is due to the requirement in the GP modelling approach for repeated inversion of a covariance matrix whose size is dictated by the number of points included in the training dataset. Therefore, in order to maintain the computational viability of the approach, a number of different strategies have been proposed to lessen the computational burden. Many of these methods seek to make the covariance matrix sparse through the selection of a subset of existing training data. However, instead of operating on an existing training dataset, in this thesis an alternative approach is proposed where the training dataset is specifically designed to be as small as possible whilst still containing as much information. In order to achieve this goal of improving the ‘efficiency’ of the training dataset, the basis of the experimental design involves adopting a more deterministic approach to exciting the system, rather than the more common random excitation approach used for the identification of black-box models. This strategy is made possible through the active use of prior knowledge of the system. The implementation of the GP modelling approach has been demonstrated on a range of simulated and real-world examples. The simulated examples investigated include both static and dynamic systems. The GP model is then applied to two laboratory-scale nonlinear systems: a Coupled Tanks system where the volume of liquid in the second tank must be predicted, and a Heat Transfer system where the temperature of the airflow along a tube must be predicted. Further extensions to the GP model are also investigated including the propagation of uncertainty from one prediction to the next, the application of sparse matrix methods, and also the use of derivative observations. A feature of the application of GP modelling approach to nonlinear system identification problems is the reliance on the squared exponential covariance function. In this thesis the benefits and limitations of this particular covariance function are made clear, and the use of alternative covariance functions and ‘mixed-model’ implementations is also discussed.
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Kim, Injoong. "Development of a knowledge model for the computer-aided design for reliability of electronic packaging systems." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/22708.
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Thesis (Ph. D.)--Mechanical Engineering, Georgia Institute of Technology, 2008.Committee Co-Chair: Peak, Russell; Committee Co-Chair: Sitaraman, Suresh; Committee Member: Paredis, Christiaan; Committee Member: Pucha, Raghuram; Committee Member: Wong, C.
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Bennasar, Mohamed. "Clinical decision support system for early detection and diagnosis of dementia." Thesis, Cardiff University, 2014. http://orca.cf.ac.uk/73073/.
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Dementia is a syndrome caused by a chronic or progressive disease of the brain, which affects memory, orientation, thinking, calculation, learning ability and language. Until recently, early diagnosis of dementia was not a high priority, since the related diseases were considered untreatable and irreversible. However, more effective treatments are becoming available, which can slow the progress of dementia if they are used in the early stages of the disease. Therefore, early diagnosis is becoming more important. The Clock Drawing Test (CDT) and Mini Mental State Examination (MMSE) are well-known cognitive assessment tests. A known obstacle to the wider usage of the CDT assessments is the scoring and interpretation of the results. This thesis introduces a novel diagnostic Clinical Decision Support System (CDSS) based on CDT which can help in the diagnosis of three stages of dementia. It also introduces the advanced methods developed for the interpretation and analysis of CDTs. The data used in this research consist of 604 clock drawings produced by dementia patients and healthy individuals. A comprehensive catalogue of 47 visual features within CDT drawings is proposed to enhance the sensitivity of the CDT in diagnosing the early stages of dementia. These features are selected following a comprehensive analysis of the available data and the most common CDT scoring systems reported in the medical literature. These features are used to build a new digitised dataset necessary for training and validating the proposed CDSS. In this thesis, a novel feature selection method is proposed for the study of CDT feature significance and to define the most important features in diagnosing dementia. iii A new framework is also introduced to analyse the temporal changes in the CDT features corresponding to the progress of dementia over time, and to define the first onset symptoms. The proposed CDSS is designed to differentiate between four cognitive function statuses: (i) normal; (ii) mild cognitive impairment or mild dementia; (iii) moderate or severe dementia; and (vi) functional. This represents a new application of the CDT, as it was previously used only to detect the positive dementia cases. Diagnosing mild cognitive impairment or early stage dementia using CDT as a standalone tool is a very challenging task. To address this, a novel cascade classifier is proposed, which benefits from combining CDT and MMSE to enhance the overall performance of the system. The proposed CDSS diagnoses the CDT drawings and places them into one of three cognitive statuses (normal or functional, mild cognitive impairment or mild dementia, and moderate or severe dementia) with an accuracy of 78.34 %. Moreover, the proposed CDSS can distinguish between the normal and the abnormal cases with accuracy of 89.54 %. The achieved results are good and outperform most of CDT scoring systems in discriminating between normal and abnormal cases as reported in existing literature. Moreover, the system shows a good performance in diagnosing the CDT drawings into one of the three cognitive statuses, even comparing well with the performance of dementia specialists. The research has been granted ethical approval from the South East Wales Research Ethics Committee to employ anonymised copies of clock drawings and copies of Mini Mental State Examination made by patients during their examination by the memory team in Llandough hospital, Cardiff.
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Yuh, Han-Sheng. "Spider: An overview of an object-oriented distributed computing system." CSUSB ScholarWorks, 1997. https://scholarworks.lib.csusb.edu/etd-project/1417.
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Johnson, Thomas Alex. "Integrating models and simulations of continuous dynamic system behavior into SysML." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24768.
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Shepherd, Robert. "The generation and classification of small leaks in a high pressure water system." Thesis, City University London, 2011. http://openaccess.city.ac.uk/1174/.
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This report investigates the detection of small leaks from the primary system of a Nuclear Pressurised Water Reactor. Leak rates of 12 g/s are invariably difficult to detect and locate. The typical leak indicators in a nuclear reactor control room are a drop in pressure and level from the pressuriser, and the air sampler detecting particulate matter. However, in both cases the leak is normally quite substantial by the time any parameters or values are obviously outside the normal operating conditions. Therefore, a small leak could go undetected for a significant amount of time. As part of the reactor safety studies, it is important to have more information about small leaks. Due to the lack of small leak data, the solution was to construct a high pressure water rig producing temperatures and pressures close to those experienced in the primary circuit, these being 200ºC and 100 bar respectively. Pressure is maintained by a vane water pump and heating is achieved by passing a high current through a small diameter, thin walled pipe. To reproduce different size cracks, various size carburettor jets are used. The water on exiting this crack, flashes to steam and immediately meets metallic pipe lagging, which is typical of most primary systems. With the typical crack scenario recreated it is now important to add sensors that will detect conditions associated with a small leak. These sensors are either mounted on or around the lagging material. The parameters that are monitored include vibrations, acoustics, thermal variations, moisture change, air flow and pressure adjustment leaving a predetermined outlet. The sensor outputs are pre-processed and the nonlinear data are applied to an artificial neural network, whereas the other data are applied to a digital logic system. The results showed that with 13 different leak rates, separated by only 1.4 g/s the ANN was able to correctly differentiate and identify different leak sizes with a certainty of over 97%. The results from all the analysis are further presented graphically through an Operator Advisory System. This informs the operator of the predicted leak size and location. All of the available sensor data relevant to the leak can be viewed and location of the leak is presented by a three dimensional model of the reactor system.
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Dai, Shanshan. "Low power high resolution electronic driver for deformable mirror systems." Thesis, Boston University, 2012. https://hdl.handle.net/2144/21143.
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Thesis (M.Sc.Eng.) PLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis or dissertation. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you.This thesis presents an integrated driver for deformable mirror array based on the architecture proposed in Horenstein, et al's "Ultra-low power multiplexed electronic driver for high resolution deformable mirror systems." The integrated driver consists of numerous high voltage (HV) analog switches connecting the deformable mirror cells, on demand by low-voltage digital control signals, to the HV analog signal line, and a HV power amplifier used to drive the HV analog signal line. The reduction of power consumption is essential in both HV power amplifier and analog switch designs for utilization of deformable mirror systems in space-based applications. In addition to low power design, this work also focuses on the analysis and design of multi-stage amplifier capable to drive large load capacitor, and HV analog switch robust to analog signal noise during OFF state. The specific research contributions of this work include (1) A feed-forward stage in combination with a class B output stage is proposed in the HV multi-stage power amplifier structure to improve the large-signal performance when driving large capacitive load. (2) A low voltage level-shifter and a voltage clamp are added in conventional HV analog switch to reduce the interference from the noisy analog signal line.
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Ha, Sungjae. "Electronic systems for interfacing with new materials and devices." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/99827.
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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2015.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 163-173).
The focus of this thesis is to explore and demonstrate electronics systems utilizing new materials and devices beyond the traditional ones solely based on Si CMOS technology. The first part of this thesis is to explore the combination of Bio-MEMS devices with traditional electronics as an effective diagnostic tool. In the case study of malaria, we report a microfluidic device as part of a continuous-flow cellular impedance spectroscopy system and a new data analysis method to differentiate Plasmodium falciparum-infected human erythrocytes including the early ring stage. The next parts of this thesis focus on two-dimensional (2D) materials which are believed to be a tool set for future electronics. In particular, graphene is explored as a new infrared sensitive material that can be used for sensors in mid- and long-wavelength infrared spectrum ([lambda] = 2- 15[mu]m) imaging systems. We demonstrate a Si CMOS-based readout IC and monolithic integration of an array of > 4000 electronically tunable graphene thermocouples. The prototype system shows that use of 2D material as add-on parts of the conventional technology can lead to development of new types of electronic applications. In addition to combinational uses with Si CMOS technology, 2D materials and their heterostructures have the potential to be used as stand-alone electronic systems. In the latter part of the thesis, we present a computer-aided design (CAD) flow for large-scale MoS₂ electronics. Combined with the state-of-the-art fabrication technology and the physics-based device model for MoS 2 FETs, a switched capacitor DC-DC converter, a half-wave rectifier, and a voltage doubler are implemented, and good agreement between simulation and measurement is observed. The presented CAD flow enables large-scale integrated circuit design on MoS₂ technology and paves the way for ubiquitous, flexible and possibly transparent electronics, such as printed RFID tags and transparent display drivers. Utilizing these design concepts, we push the capability of current electronics beyond its traditional boundaries.
by Sungjae Ha.
Ph. D.
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Barry, Richard Malan. "Design of a distributed satellite ground system." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52180.
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Thesis (MEng)--University of Stellenbosch, 2001.ENGLISH ABSTRACT: This thesis describes the development of a distributed ground support system to be used in the small satellite program at the University of Stellenbosch. A literature study was done to determine the current trends in ground support design. These trends are presented together with an analysis of the SUNSAT groundstation software. New technologies in the field of distributed systems are discussed and used in the design of a distributed ground support system. The design centres around a servicesbased architecture where services are distributed on the network. The design is evaluated according to attributes exhibited by effective distributed systems. Certain services were implemented to demonstrate the feasibility of the design. The implementations are discussed and suggestions are made for future improvements and fields of possible further study.
AFRIKAANSE OPSOMMING: Hierdie tesis beskryf die ontwikkeling van 'n verspreide-grondstasie-sisteem vir gebruik in die Universiteit van Stellenbosch se satelliet-program. Eerstens is 'n literatuurstudie gedoen om die huidige verwikkelinge in die veld van satellietondersteuning-ontwikkeling vas te stel. Hierdie verwikkelinge word bespreek en gebruik om die SUNSAT-grondstasie sagteware te evalueer. Nuwe tegnologieë in die veld van verspreide stelsels word ondersoek en bespreek. Die ontwerp van die grondstasie is gebaseer op 'n verspreide dienste argitektuur. Die ontwerp word beskryf en geëvalueer aan die hand van kenmerke tipies van 'n effektiewe verspreide stelsel. Om die werkbaarheid van die ontwerp te toon, is sekere van die dienste geïmplimenteer, en die funksionering daarvan word bespreek. Voorstelle word ook gemaak oor moontlike toekomstige navorsing wat gedoen kan word.
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Jamieson, Andrew George. "A novel systems design approach to wireless sensor networks for industrial applications." Thesis, University of Glasgow, 2008. http://theses.gla.ac.uk/424/.
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Wireless Sensor Networks are a constantly evolving field spanning the Electronic Engineering and Computer Science domains; where the primary tasks of computation, communication and sensing are combined into ever smaller physical node devices. By utilising advanced multi-hop mesh networking techniques, scores of these nodes can form complex heterogeneous networks, where the efforts of discrete nodes combine to achieve a common goal. This themed Engineering Doctorate portfolio describes a four year period where the Research Engineer, in conjunction with the sponsoring company, The Kelvin Institute Ltd, undertook a range of interlinked research, development and business projects. Each venture was closely aligned to the technical and commercial interests of the sponsor, initiated in late 2003 by a preliminary look at the state-of-the-art and evaluation of early development nodes for location services. The primary project stemmed from this initial research and was undertaken with a collaborating company in the UK rail industry. Results from this work inspired a further project considering the use of security features to provide a new routing methodology for Wireless Sensor Networks and other ad-hoc topologies. In addition to the technical merit and academic contributions to the field, this themed portfolio considers the equally important commercial and business aspects, highlighting notable events and achievements throughout the course of the Engineering Doctorate programme.
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Wang, Koping. "Spider II: A component-based distributed computing system." CSUSB ScholarWorks, 2001. https://scholarworks.lib.csusb.edu/etd-project/1874.
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Spider II system is the second version implementation of the Spider project. This system is the first distributed computation research project in the Department of Computer Science at CSUSB. Spider II is a distributed virtual machine on top of the UNIX or LINUX operating system. Spider II features multi-tasking, load balancing and fault tolerance, which optimize the performance and stability of the system.
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Almoumen, Sana's Hassan M. "Requirements engineering for e-commerce : a principle-driven analysis and assessment approach and guideleines on good practices for developing multicultural e-commerce systems." Thesis, Lancaster University, 2003. http://eprints.lancs.ac.uk/12226/.
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Mostert, Sias. "A computational architecture for real-time systems." Thesis, Stellenbosch : Stellenbosch University, 2000. http://hdl.handle.net/10019.1/51562.
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Thesis (PhD)--Stellenbosch University, 2000.ENGLISH ABSTRACT: The engineering of dependable real-time systems for mission critical applications is a resource intensive and error prone process. Achieving dependability requires a general consensus on the correctness of a system with regard to its intended function. For a consensus to be achieved, the properties of the system must be well understood which, in turn, requires consensus on a rigorously defined computational architecture. There is currently no single agreed upon computational architecture at the application level which can serve as a common denominator for the design and implementation of real-time systems. It is the thesis of this dissertation that a rigorous computational architecture, applicable from design to implementation, enables engineers to better understand software for real-time systems. To substantiate this claim, the real-time data flow architecture RDF with its notation allowing the description of complete systems from design to implementation will be explored. Four distinct research areas for improving the engineering process of real-time systems are dealt with in the dissertation: 1) the development of an architecture for real-time systems being suitable for design and implementation in software and hardware, 2) the consolidation of a number of graphical languages into a graphical notation for functional specification, design and construction of real-time systems, 3) the development of a simple processor architecture for the execution of real-time applications, and 4) and the evaluation of the architecture in the framework of a microsatellite case study. In particular, the following original contributions are made: 1) the firing semantics of data flow systems are expanded to include disjunctive firing semantics in a novel way in addition to the classical conjunctive firing semantics, 2) the inherent real-time data flow property, Le. that a receiving task must be ready to receive the next incoming message when it is sent, is extended to the synchronous data flow model, 3) a notation for describing all properties of real-time systems is defined 'with the real-time data flow language RDF as base language, 4) two hardware processor architectures are introduced that offer one-to-one correspondence between design and implementation and, thus, reduce the semantic gap between design language and program execution, and 5) the class of systems that can be modelled with data flow architectures is shown to include control systems and data flow systems. The language set and processor architecture were applied to certain aspects of the SUNSAT microsatellite project.
AFRIKAANSE OPSOMMING:Die skep van betroubare intydsestelsels vir missie kritiese toepassings is 'n proses wat baie hulpbronne verg en waarin maklik 'n fout gemaak kan word. Om 'n betroubare stelsel te skep vereis 'n konsensus oor die korrektheid van 'n stelsel, wat bereik word wanneer die eienskappe van die stelsel goed verstaan word. Dit vereis op sy beurt weer 'n konsensus oor 'n goed gedefinieerde berekenings argitektuur. Daar is tans geen enkel ooreengekome berekenings argitektuur op die toepassingsvlak wat kan dien as 'n gemeenskaplike voertuig vir die ontwerp en implementering van intydsestelsels nie. Dit is die hipotese van die proefskrif dat 'n berekenings argitektuur met 'n streng basis, wat toegepas kan word vanaf ontwerp tot implementering, ingenieurs in staat sal stel om intydsestelsels beter te kan verstaan. Die hipotese word ondersoek deur die intydse datavloei argitektuur, RDF, te gebruik om 'n stelsel vanaf ontwerp tot implementering te beskryf. Daar is vier spesifieke navorsings areas ter verbetering van die ingenieurswese proses vir intydsestelsels, wat in die proefskrif aangespreek word: 1) die ontwikkelling van 'n argitektuur vir intydsestelsels wat geskik is vir die ontwerp en implementering in programmatuur en apparatuur, 2) . die konsolidering van 'n aantal grafiese tale in 'n grafiese notasie vir die funksionele spesifikasie, ontwerp en implementering van intydsestelsels, 3) die ontwikkelling van 'n eenvoudige verwerker argitektuur vir die uitvoering van intydse toepassings en 4) die evaluering van die argitektuur in die konteks van 'n mikrosatelliet gevallestudie. Die volgende oorspronklike bydraes word gemaak: 1) die sneller voorwaardes vir datavloei stelsels word uitgebrei met 'n disjunktiewe patroon saam met die tradisionele konjunktiewe patroon, 2) die inherente intydse datavloei eienskap, n.l. dat'n taak wat boodskappe ontvang, alle verwerking wat met 'n vorige boodskap gepaard gegaan het moet afhandel, voordat 'n volgende boodskap ontvang word, word uitgebrei na die sinkrone datavloei model, 3) 'n notasie om al die eienskappe van 'n intydsestelsel te beskryf word gedefinieer met RDF as die basis taal, 4) twee apparatuur verwerker argitekture word beskryf wat 'n een-tot-een kartering aanbied tussen die ontwerp en die implementering, en wat gevolglik die semantiese gaping verklein tussen ontwerpstaal en die uitvoeringsargitektuur en 5) die klasse van stelsels wat gemodelleer kan word met RDF sluit beheerstelsels en datavloeistelsels in. Die grafiese notasie en verwerker argitektuur was toegepas op sekere aspekte van die SUNSAT mikrosatelliet projek.
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Khaw, Fook Cheon. "An expert system for adaptive part routing in computer integrated manufacturing." Ohio : Ohio University, 1987. http://www.ohiolink.edu/etd/view.cgi?ohiou1183047615.
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Jordaan, Jacques. "The evaluation of a SoC processor as an on-board computer for a low earth orbit satellite." Thesis, Stellenbosch : Stellenbosch University, 2005. http://hdl.handle.net/10019.1/50487.
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Thesis (MScEng)--University of Stellenbosch, 2005.ENGLISH ABSTRACT: The use of commercial-off-the-shelf components in low earth orbit (LEO) satellite systems has become a very popular design trend. Not only are many of these components sufficiently radiation tolerant, but are also less expensive than their space qualified counterparts. Commercial processors are already used in the on-board computer (OBC) of satellites like SUNSAT 2004, CanX and SNAP-I. With the increasing demand for smaller, less expensive satellites and a shorter time-to-market window, the feasibility of implementing a satellite's OBC as a system-on-a-chip (SoC) is now considered. This thesis describes a single-chip implementation, excluding memory, of a LEO microsatellite's OBC on the commercial grade Altera Excalibur embedded processor. A typical satellite OBC system was developed on the Excalibur device to test the functionality and performance of the device as a single-chip OBC.
AFRIKAANSE OPSOMMING: Die gebruik van kommersiële komponente in lae aardwentelbaan satelliet stelsels het 'n baie gewilde ontwerps neiging geword. Meeste van hierdie komersiële komponente is nie net voldoende bestand teen die radiasie in die ruimte nie, maar boonop goedkoper as soortgelyke komponente wat spesifiek vir de ruimte vervaardig is. Kommersiële verwerkers word alreeds gebruik in die aanboord rekenaar (AR) van satelliete soos SUNSAT 2004, CanX and SNAP-I. Met die aahoudende aanvraag vir kleiner, goedkoper en 'n korter ontwikkelings tydperk, word die implementering van 'n satelliet se AR as 'n stelsel-op-'nskyfie nou oorweeg. Hierdie tesis beskryf 'n enkel-skyfie implementasie, geheue uitgesluit, van 'n lae aardwentelbaan mikrosatelliet se AR op die kommersiële Altera Excalibur geïntregreerde verwerker. 'n Tipiese AR stelsel was ontwikkelop die Excalibur verwerker om die funksionaliteit en werkverrigting van die toestel as 'n enkel-skyfie AR te toets.
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Tam, Tony. "Identity-Based Encryption on resource constrained embedded system." Thesis, California State University, Long Beach, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1569592.
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The use of smart embedded device has been growing rapidly recently because of the miniaturization of sensors and platforms. A resource-efficient Public Key Cryptography (PKC) is very desirable for the resource-constrained embedded system. Whereas most public key security protocols requires both public and private keys to be generated together, Identity Based Encryption (IBE), a public key cryptography protocol, allows the public key to be generated from an arbitrary string. IBE has been actively researched and deployed, but conventional IBE primitives are still computationally demanding and may not be suitable for all embedded system. Simplified version of the identity based encryption is available and satisfies the tight budget of the embedded platform. In this thesis, we describe the implementation of lightweight IBE based on elliptic curve in resource-constrained embedded sensor nodes. We also compare and contrast its performance with the conventional pairing-based approach.