Дисертації: "Electronic System Engineering"

1

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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2

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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3

Mahajan, Nikhil R. "System Protection for Power Electronic Building Block Based DC Distribution Systems." NCSU, 2004. http://www.lib.ncsu.edu/theses/available/etd-12052004-233822/.

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The purpose of this research has been to develop an agent based protection and reconfiguration scheme for power electronic building block based (PEBB) DC distribution systems. One of the foremost applications would be in the new zonal DC distribution on naval ships. The research involves the design of an agent based protection scheme which uses the PEBBs for current limiting and circuit breaking purposes. Considerations are given to reduce the system downtime under fault conditions, allow proper coordination and provide backup protection. The research also involves the design of a reconfiguration management scheme based on collaborative agents. The collaboration ensures that the reconfiguration is achieved at a global level, enhancing the system survivability under the conditions of multiple faults and damages. The coordination ensures that only the faulted part of the system is isolated and the reconfiguration makes sure that the power to the healthy part of the system is supplied continuously. The reconfiguration management also performs load shedding if the generation does not meet the load demand of the reconfigured system due to a fault or damage in the generator.

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4

McWhorter, Tanner Maxwell. "Cognitive Electronic Warfare System." Miami University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=miami1595708553000249.

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5

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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6

Lim, Jui Min. "An approach to improving the power management system in electronic devices." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/59256.

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Thesis (S.M. in System Design and Management)--Massachusetts Institute of Technology, Engineering Systems Division, 2010.
Page 100 blank. Cataloged from PDF version of thesis.
Includes bibliographical references (p. 98-99).
The current power management technology baseline does not address the increasing gap between system charge performance and functionality needs in a smartphone. This gap can eventually inhibit further increases in functionality and develop a balancing loop effect that reduces smartphone growth rates. Longer smartphone operation duration between recharging is currently being addressed with the introduction of low power circuit chips, low power displays and power management software. This thesis explores options that improve overall power management by looking at the power source and recharging methods. This thesis also explores technology transitions and management strategies that address the different multi-mode interactions between technology transitions.
by Jui Min Lim.
S.M.in System Design and Management

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7

Quezada, Gomez Juan Manuel. "Model-based guidelines for automotive electronic systems software development." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/100383.

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Thesis: S.M. in Engineering and Management, Massachusetts Institute of Technology, Engineering Systems Division, System Design and Management Program, 2015.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 96-98).
The automobile innovation transformed the human life style ever since its introduction to the public, and for over the last one hundred years incumbent technologies have been adopted to improve its performance characteristics. Yet, we need a holistic approach to understand that automobiles shifted from being a mere assembly of mechanical parts to a multidisciplinary system that form the modern automobile. Thanks to the increased use of electronics and software in automobiles, consumers benefit from better gas mileage, more amenities and features, such as comfort, driving assistance, and entertainment. At the same time, stability and performance of automobiles as systems have been facing deterioration, and eventually vehicle owners are finding that features and functions become inoperative over time, causing frustration, loss of time and money. Reports of problems experienced by vehicle owners have stem from casual factors of system defects that model-based systems engineering can reduce or eliminate. This research presents a model-based systems engineering approach to an automobile electronic system design. The work is founded on a comprehensive OPM model and engineering guidelines for electronic control module software design. The purpose of the framework developed in this study is to support development of complex vehicle software that allows flexibility for changing features and creating new ones, and enables software developers to pinpoint systemic faults quicker and at earlier lifecycle phases, reducing rework, increasing safety, and providing for more effective resolution of such problems.
by Juan Manuel Quezada Gomez.
S.M. in Engineering and Management

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8

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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9

Marais, Johannes Izak Frederik. "A permittivity measurement system for high frequency laboratories." Thesis, Link to the online version, 2006. http://hdl.handle.net/10019/580.

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10

Van, Niekerk Philip Charl. "A Cryogenic CMOS-based Control System for Testing Superconductor Electronics." Thesis, Link to the online version, 2008. http://hdl.handle.net/10019/1338.

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11

Cui, Li. "Conducting polymer-based QCM-interdigitated electrode hybrid electronic nose system." Thesis, University of Glasgow, 1999. http://theses.gla.ac.uk/3974/.

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This research project was concerned with the establishment and characterisation of a quartz crystal microbalance (QCM) - conductimetric interdigitated electrode hybrid "second generation" Electronic Nose system. Research objectives covered a number of technical limitations and analytical difficulties existed in the "first generation" Electronic Nose system. A wide variety of work was carried out, including the design and fabrication of the electronic nose system, the optimisation of sensors response, the device modelling, the studies of vapour-polymer interaction mechanisms and the application of the electronic nose in multi-component analysis. A QCM-interdigitated electrode hybrid sensor odour measurement system was established, and sensor fabrication techniques developed. Some important parameters corresponding to sensor characteristics were investigated such as the conditions for polymer film polymerisation. By studying 16 different coatings, "optimal" individual initial resistances were proposed, which minimise long-term baseline resistance drift, whilst maintaining good sensitivity. A set of sensors was made with low initial resistance variation. Sensor detection dynamic range was found to be dependent on the type of the coating material and the film thickness. The response of a combined hybrid sensor pair remained stable during a test period of 45 days, which showed an improved stability. The principle of the sensor's response and device modelling were addressed. The vapour-polymer interactions and sensor pair's response were linked by a sensitivity coefficient (S), which was defined as the relative resistivity change by a single molecule absorbed into the polymer film. A pair of sensors showing concentration independence over a wide concentration range can be formed on separate QCM and interdigitated electrodes with the same polymer. The combined response (Srf) can be used to identify a particular vapour. Based on the concentration independence, the proposed "odour maps" showed the feasibility of distinguishing odourants using a significantly lower number of different types of sensor coatings. This demonstrated the improved selectivity of a hybrid system compared with the single property system.

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12

Cronje, Johannes Jacobus. "Software architecture design of a software defined radio system." Thesis, Stellenbosch : Stellenbosch University, 2004. http://hdl.handle.net/10019.1/50095.

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Thesis (MScEng)--University of Stellenbosch, 2004.
ENGLISH ABSTRACT: The high pace of technological advancement enables the realisation of ever more advanced mobile communications standards with more functionality than simple voice communications. The hardware that is used to implement the radio sections of these systems generally require long design cycles, much longer than the design cycles of the other components of a communications system. Another problem is that, once new communications standards are introduced, the current hardware platforms used in the terminal equipment becomes obsolete because they can generally not be used with the new standards. This has serious cost implications for both the service provider and the consumer, because both parties have to acquire new equipment to be able to use the new standards. An elegant solution to the above issues is to use software-defined radio sections to replace the hardware radio components. New communications standards can then be supported by simply loading new software onto the equipment, provided the maximum processing capacity of the processor(s) that the software runs on can accommodate the bandwidth requirements of that specific standard. This thesis investigates the ideas behind software defined radio and also describes the design and implementation of a software architecture that can be used to implement software defined radios on general-purpose platforms such as personal computers.
AFRIKAANSE OPSOMMING: Die hoë tempo van tegnologiese vordering maak dit moontlik om baie gevorderde mobiele kommunikasie standaarde te implementeer wat meer funksionaliteit bied as blote spraakkommunikasie. Die hardeware wat gebruik word om die radios van sulke stelsels te implementeer neem gewoonlik langer om te ontwikkel as die ander komponente van die stelsels. Die ander probleem is dat hierdie hardeware gewoonlik nie hergebruik kan word wanneer nuwe kommunikasie standaarde in gebruik geneem word nie omdat die standaarde nie versoenbaar is nie. Dit het tot gevolg dat beide die verbruiker en die diensverskaffer groot bedrae geld moet spandeer om die nuwe tegnologie te kan gebruik. 'n Elegante oplossing vir hierdie probleme is om gebruik te maak van radios waarvan die funksionaliteit in sagteware gedefiniëer word. Nuwe kommunikasie standaarde kan dan gebruik word deur slegs die nodige sagteware op die toerusting te laai, solank die verwerkingskapasiteit van die mikroverwerkers in die stelsel die benodigde bandwydte kan akkommodeer. Hierdie tesis ondersoek die konsepte van sagteware-gedefiniëerde radio en beskryf die ontwerp en implementering van 'n sagteware argitektuur vir die implementering van sagteware-gedefiniëerde radios op veeldoelige platforms soos persoonlike rekenaars.

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13

Van, Ysendyk Nigel Brett. "Development of a "mains borne" remote control system." Thesis, Cape Technikon, 1991. http://hdl.handle.net/20.500.11838/1118.

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Thesis (Masters Diploma (Technology)-- Cape Technikon, Cape Town, 1991
Many environments employ time switches to control the operation of electrical machinery and appliances. These devices are generally expensive and require extensive wiring and individualised treatment. The need therefore arises for a more efficient and economical control system that will not be subjected to the limitations found in conventional remote control systems. This thesis describes a universal remote control system developed to suitably replace conventional systems prone to various limitations and restrictions. The system is "mains borne" and therefore makes use of the mains wiring for interconnectivity. The term "Mains borne" refers to the communicating medium interconnecting the various components.

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14

Herselman, Paul Le Roux. "Borehole radar system analysis in stratified geological systems applied to imaging of platiniferous reefs in the bushveld igneous." Thesis, Stellenbosch : University of Stellenbosch, 2003. http://hdl.handle.net/10019.1/1313.

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Thesis (PhD (Electrical and Electronic Engineering))--University of Stellenbosch, 2003.
The imaging of platiniferous reefs in the Bushveld Igneous Complex (BIC) is of great economical and sociological importance. Borehole radar technology has been identified as a viable mapping tool to be used in day-to-day mining operations, but a critical assessment has to be made on the feasibility of this postulation. The system analysis made of the borehole radar deployed in the BIC is presented in this dissertation. The analysis is done using a specific example - the GeoMole borehole radar system. A novel procedure, based on the basic theory of electromagnetic radiation and propagation, is proposed by which the entire physical radar system can be characterized. The power transmitted by an unconventional borehole-deployed transmitter is estimated by a sequence of free space measurements, numerical simulations and theoretic derivations and approximations. Antenna transfer functions (magnitude and phase) are numerically simulated for a variety of deployment configurations. The total system transfer function of the receiver analogue and digital chain is determined. This enables the calculation of the radar's performance figures necessary to determine the applicability of the radar in a specific geological setting. A radar system is only complete when considered in its environment. The BIC is a stratified system of numerous rock layers. An in-depth study is done on the propagation of radiowaves in stratified lossy media. Only the case for non-magnetic media is discussed in this dissertation. The developed theory is used to predict the system response to a typical transmitted radar pulse in the UG1 - UG2 stratigraphy of the BIC, determine the maximum detection range of reef horizons and estimate the reflectivity of the reefs. Resolution is one of the key parameters that determine the performance and accuracy of imaging. An algorithm is proposed, developed and tested by which the resolution of the system is increased and overlapping echoes become resolvable. Even though some of the techniques are developed with a specific system in mind, the applicability of the concepts and algorithms is universal.

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15

Smuts, Matthys. "Software modem for a software defined radio system." Thesis, Stellenbosch : University of Stellenbosch, 2007. http://hdl.handle.net/10019.1/1985.

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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2007.
The use of older and slower protocols has become increasingly difficult to justify due to the rapid pace at which telecommunications are advancing. To keep up to date with the latest technologies, the communications system must be designed to accommodate the transparent insertion of new communications standards in all the stages of a system. The system should, however, also remain compatible with the older standards so as not to demand an upgrade of the older systems. The concept of a software defined radio was introduced to overcome these problems. In a software defined radio system, the functionality of the communications system is defined in software, which removes the the need for alterations to the hardware during technology upgrade. To maintain interoperatibilty, the system must be based on a standardised architecture. This would further allow for enhanced scalability and provide a plug-andplay feature for the components of the system. In this thesis, generic signal processing software components are developed to illustrate the creation of a basic software modem that can be parameterised to comply fully, or partially, to various standards.

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16

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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17

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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18

Fredholm, Susan (Susan A. ). "Evaluating electronic waste recycling systems : the influence of physical architecture on system performance." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/52750.

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Thesis (S.M. in Technology and Policy)--Massachusetts Institute of Technology, Engineering Systems Division, Technology and Policy Program, 2008.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (p. 63-68).
Many different forms of electronic waste recycling systems now exist worldwide, and the amount of related legislation continues to increase. Numerous approaches have been proposed including landfill bans, extended producer responsibility (EPR) and advance recovery fee (ARF) funded recycling systems. In order for policymakers and system architects to establish the optimal recycling system for their location, they need to know how to evaluate the performance of existing systems, and furthermore, how to use this information to design new systems. This thesis addresses the question: How does the physical system architecture of e-waste systems influence system performance? Specifically, it focuses upon the physical system architecture of collection site density and distribution. This thesis presents a systematic methodology developed with the Materials Systems Laboratory for characterizing recycling systems. Case studies of existing e-waste systems operating in Switzerland, Sweden, the Netherlands, Norway, Belgium, the Canadian province of Alberta and the US States of California, Maine and Maryland are examined for correlations between the environmental and financial performance of existing systems with respect to both the context and the architectural options of those systems. The case study analysis furthermore informs the construction of a model of e-waste systems. This model, which examines architectural choices in collection, transport, processing and system management of e-waste, is used to predict the environmental and financial performance of theoretical e-waste systems for a given location. The model was intentionally developed to be both broad, in order to encompass all pieces of recycling systems, and general, such that many different types of systems, both real and hypothetical, can be analyzed. Following an application of the model to several different combinations of system architecture and context, policy recommendations are made regarding the construction and evaluation of e-waste systems in various locations.
by Susan Fredholm.
S.M.in Technology and Policy

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19

Li, Shuo. "System-Level Architectural Hardware Synthesis for Digital Signal Processing Sub-Systems." Doctoral thesis, KTH, Elektronik och Inbyggda System, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-180441.

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This thesis presents a novel system-level synthesis framework called System-Level Architectural Synthesis Framework (SYLVA), which synthesizes DigitalSignal Processing (DSP) sub-systems modeled by synchronous data ?ow intohardware implementations in Application-Specific Integrated Circuit (ASIC),Field-Programmable Gate Array (FPGA) or Coarse-Grained ReconfigurableArchitecture (CGRA) style. SYLVA synthesizes in terms of pre-characterizedFunction Implementations (FIMPs). It explores the design space in threedimensions, number of FIMPs, type of FIMPs, and pipeline parallelism be-tween the producing and consuming FIMPs. SYLVA also introduces timingand interface model of FIMPs to enable reuse and automatic generation ofGlobal Interconnect and Control (GLIC) to glue the FIMPs together into aworking system. SYLVA has been evaluated by applying it to several realand synthetic DSP applications and the experimental results are analyzedfor the design space exploration, the GLIC synthesis, the code generation,and the CGRA floorplanning features. The conclusion from the experimentalresults is that by exploring the multi-dimensional design space in terms ofpre-characterized FIMPs, SYLVA explores a richer design space and does itmore effectively compared to the existing High-Level Synthesis (HLS) toolsto improve both engineering and computational efficiency.

QC 20160125

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20

Hassankhan, Mokri Aria. "Efficient Garbage Collection System." Thesis, Cybercom Group AB, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-18149.

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It has been for decades since invention and use of automation has become important and popular to achieve economic and technical advantages in almost all aspects of operations and productions. Integration of communication with the automation has provided many additional and practical applications in a wide spectrum of industries and the everyday life of the people.This IoT project is implemented as a thesis project for BS program for “Electrical Engineering with Emphasis on Data Telecommunication” in Blekinge Tekniska Högskola, Karlskrona at Cybercom Group AB, Stockholm.The project is aiming at design and implementation of an efficient garbage collection system with the help of real-time communication, IoT techniques, sensors, and a number of computer software.The efficiency which is targeted in this project is meant to reducing environmental pollution (including toxic materials and sound pollution) manpower, operational cost, usage of urban roads and traffic grid, and increasing of overall efficiency by increasing employee’s and roads safety, use of existing installation, speed of garbage collection activities, and overall profitability for the operators.The goal is achieved by design and implementation of an intelligent system which despatches garbage collection trucks to the job only when it is the exact time when the capacity of the garbage cans is efficiently utilized, hence, saving endowments and increasing profitability. The project consists of four major parts • Design and implementation of the controller system hardware. • Design and implementation of the controller software. • Design and implementation of the user interface software. • Design and implementation of the integrated mechanical system.

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21

Nader, Charles. "Enhancing Radio Frequency System Performance by Digital Signal Processing." Licentiate thesis, University of Gävle, Department of Electronics, Mathematics and Natural Sciences, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-7312.

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In this thesis measurement systems for the purpose of characterization of radio frequency power amplifiers are studied. Methods to increase the speed, accuracy, bandwidth, as well as to reduce the sampling requirements and testing cost are presented. A method intended for signal shaping with respect to peak to-average ratio reduction and its effects-improvements on the radio frequency front-end performance is investigated.

A time domain measurement system intended for fast and accurate measurements and characterization of radio frequency power amplifiers is discussed. An automated, fast and accurate technique for power and frequency sweep measurements is presented. Multidimensional representation of measured figure of merits is evaluated for its importance on the production-testing phase of power amplifiers.

A technique to extend the digital bandwidth of a measurement system is discussed. It is based on the Zhu-Frank generalized sampling theorem which decreases the requirements on the sampling rate of the measurement system. Its application for power amplifiers behavioral modeling is discussed and evaluated experimentally.

A general method for designing multitone for the purpose of out-of-band characterization of nonlinear radio frequency modules using harmonic sampling is presented. It has an application with the validation of power amplifiers behavioral models in their out-of-band frequency spectral support when extracted from undersampled data.

A method for unfolding the frequency spectrum of undersampled wideband signals is presented. It is of high relevance to state-of-the-art radio frequency measurement systems which capture repetitive waveform based on a sampling rate that violates the Nyquist constraint. The method is presented in a compact form, it eliminates ambiguities caused by folded frequency spectra standing outside the Nyquist band, and is relevant for calibration matters.

A convex optimization reduction-based method of peaks-to-average ratio of orthogonal frequency division multiplexing signals is presented and experimentally validated for a wireless local area network system. Improvements on the radio frequency power amplifier level are investigated with respect to power added efficiency, output power, in-band and out-of-band errors. The influence of the power distribution in the excitation signal on power amplifier performance was evaluated.

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22

Visagie, Albertus Sybrand. "Speech generation in a spoken dialogue system." Thesis, Stellenbosch : University of Stellenbosch, 2004. http://hdl.handle.net/10019.1/16460.

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Анотація:

Thesis (MScIng)--University of Stellenbosch, 2004.
ENGLISH ABSTRACT: Spoken dialogue systems accessed over the telephone network are rapidly becoming more popular as a means to reduce call-centre costs and improve customer experience. It is now technologically feasible to delegate repetitive and relatively simple tasks conducted in most telephone calls to automatic systems. Such a system uses speech recognition to take input from users. This work focuses on the speech generation component that a specific prototype system uses to convey audible speech output back to the user. Many commercial systems contain general text-to-speech synthesisers. Text-to-speech synthesis is a very active branch of speech processing. It aims to build machines that read text aloud. In some languages this has been a reality for almost two decades. While these synthesisers are often very understandable, they almost never sound natural. The output quality of synthetic speech is considered to be a very important factor in the user’s perception of the quality and usability of spoken dialogue systems. The static nature of the spoken dialogue system is exploited to produce a custom speech synthesis component that provides very high quality output speech for the particular application. To this end the current state of the art in speech synthesis is surveyed and summarised. A unit-selection synthesiser is produced that functions in Afrikaans, English and Xhosa. The unit-selection synthesiser selects short waveforms from a recorded speech corpus, and concatenates them to produce the required utterances. Techniques are developed for designing a compact corpus and processing it to produce a unit-selection database. Speech modification methods were researched to build a framework for natural-sounding speech concatenation. This framework also provides pitch and duration modification capabilities that will enable research in languages such as Afrikaans and Xhosa where text-to-speech capabilities are relatively immature.
AFRIKAANSE OPSOMMING: Telefoniese, spraakgebaseerde dialoogstelsels word steeds meer algemeen, en is ’n doeltreffende metode om oproepsentrumkostes te verlaag. Dit is tans tegnologies moontlik om ’n groot aantal eenvoudige transaksies met automatiese stelsels te hanteer. Sulke stelsels gebruik spraakherkenning om intree van die gebruiker te ontvang. Hierdie werk fokus op die spraakgenerasiekomponent wat ’n spesifieke prototipestelsel gebruik om afvoer aan die gebruiker terug te speel. Vele kommersi¨ele stelsels gebruik generiese teks-na-spraak sintetiseerders. Sulke teksna- spraak sintetiseerders is steeds ’n baie aktiewe veld in spraaknavorsing. In die algemeen poog navorsing om teks te kan lees en om te sit in verstaanbare spraak. Sulke stelsels bestaan nou al vir ten minste twee dekades. Alhoewel heeltemal verstaanbaar, klink hierdie stelsels onnatuurlik. In telefoniese spraakgebaseerde dialoogstelsels is kwaliteit van die sintetiese spraak belangrik vir die gebruiker se persepsie van die stelsel se kwaliteit en bruikbaarheid. Die dialoog is meestal staties van aard en hierdie eienskap word benut om ho¨e kwaliteit spraak in ’n bepaalde toepassing te sintetiseer. Om dit reg te kry is die huidige stand van sake in hierdie veld bestudeer en opgesom. ’n Knip-en-plak sintetiseerder is gebou wat werk in Afrikaans, Engels en Xhosa. Die sintetiseerder selekteer kort stukkies spraakgolfvorms vanuit ’n spraakkorpus, en las dit aanmekaar om die vereiste spraak te produseer. Outomatiese tegnieke is ontwikkel om ’n kompakte korpus te ontwerp wat steeds alles bevat wat die sintetiseerder sal nodig hˆe om sy taak te verrig. Verdere tegnieke prosesseer die korpus tot ’n bruikbare vorm vir sintese. Metodes van spraakmodifikasie is ondersoek ten einde die aanmekaargelaste stukkies spraak meer natuurlik te laat klink en die intonasie en tempo daarvan te korrigeer. Dit verskaf infrastruktuur vir navorsing in tale soos Afrikaans en Xhosa waar teks-na-spraak vermo¨ens nog onvolwasse is.

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23

Cai, Tianyi. "Optimization and Characterization of a Laser Engraving System for Carbon-Based Electronic Devices." Ohio University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1555327711882411.

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24

McCalib, David Jr. "Design method of a modular electronic printed circuit board testing system." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/85790.

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Анотація:

Thesis: M. Eng. in Manufacturing, Massachusetts Institute of Technology, Department of Mechanical Engineering, 2013.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 52-54).
The failure rate of the printed circuit board electronic testing process is higher than acceptable at a Lenze Americas factory. This thesis will understand the root causes of failure, and use system engineering methods to decide what course of action should be taken. A Tradespace analysis is used to help decompose some of the complexity into a visualization that simplifies the decision process. The Tradespace analysis suggests that more utility can be achieved by upgrading the design of existing test fixtures versus purchasing off of the shelf solutions. The second phase will identify a design concept, offer specific design solutions, and finally a fully designed system that is capable of improving the performance of the test fixtures in electronic board test area by 50%. The system is then upgradable with in-line conveyors to run autonomously decoupling the operator from the process.
by David McCalib, Jr.
M. Eng. in Manufacturing

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25

Du, Preez Juan. "The development of an infra-red monitoring and data-logging system." Thesis, Cape Technikon, 1991. http://hdl.handle.net/20.500.11838/1128.

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Thesis (Masters Diploma (Light Current))--Cape Technikon, Cape Town,1991
This thesis describes the design and development of an infrared monitoring and data logging system. The infra-red unit will be used to monitor certain hiking trails on Table Mountain, whilst the logging unit will be used to log the date and time of the monitored person into memory. This logged data can then be used to compute the statistics relating to that specific hiking trail.

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26

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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27

Perumal, Palani. "Business model and strategy analysis for radiologists to use electronic health records (EHR)." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/76928.

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Thesis (S.M. in Engineering and Management)--Massachusetts Institute of Technology, Engineering Systems Division, System Design and Management Program, 2012.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 90-94).
Radiology is a medical specialty that employs imaging to diagnose and treat disease. It has long been an advance user of technology to capture, store, share, and use images electronically. In 2009, President Obama signed into law a measure, the HITECH Act (part of the stimulus package), that incentivizes healthcare providers to use electronic health records (EHR) in care delivery to improve quality, efficiency, safety, and reduce cost. The meaningful use (MU) program's Stage 1 requirements (part of HITECH Act) did not include imaging requirements, leading to confusion among radiologists and other specialties with regard to what MU offers to and requires of them. This thesis attempts to clarify the contribution radiology can make to MU by understanding radiology as a system, including its surrounding issues and its drivers, using Stage 1 MU requirements, data from qualitative research, and results from analysis. It answers the following question: Should Radiologists be considered part of the care team, leveraging EHR for meaningful use and hence eligible for incentive payments? It does so via the following methods: a) Discussing in detail current issues surrounding radiology systems from quality, safety, efficiency, and cost perspectives; b) Discussing MU in the context of radiology and reviewing what is missing in it for radiologists; c) Providing deeper systems analysis of current behaviors and why they have this form at this time; and d) Explaining how MU objectives can help to overcome many current issues and ultimately help to improve health outcomes. Specific changes to MU criteria to achieve these benefits are recommended. This thesis employs systems concepts and tools including system architecture and system dynamics for research and analysis to understand the system and derive hypotheses. A system dynamics model is used to analyze current drivers in imaging and to clarify the impact MU can have on these drivers. Thesis conclusions are supported by the analysis performed using the model as well as information gathered through industry interviews, online articles, academic and industry journals, and blogs.
by Palani Perumal.
S.M.in Engineering and Management

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28

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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29

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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30

Rosén, Alexander, and David Lööf. "Ramverk för livscykelkostnader vid Saab Electronic Defence System." Thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Industriell organisation och produktion, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-15214.

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I dagens hårda konkurrens är det viktigt för företag som tillverkar högteknologiska produkter att ha kännedom om vilka kostnader som uppstår på eftermarknaden dvs efter att kunden har köpt deras produkter. Detta är viktigt dels för att kunna visa kunden vilka kostnader som är förknippade med produkten under hela dess livslängd och dels för att öka kostnadsmedvetenheten internt på företaget. Syftet med detta examensarbete är att ta fram en livscykelkostnadsmodell och på ett tydligt sätt visa vilka kostnader som uppstår efter att Saab Electronic Defence Systems i Jönköping har levererat en färdig produkt till kund tills det att den ska avvecklas. Detta var ett behov som fanns på företaget eftersom det inte fanns någon övergripande modell som visar vilka kostnader som uppstår samt vilka aktiviteter som skapar dessa kostnader. För att svara på frågeställningarna har litteraturstudier genomförts parallellt med att flertalet undersökningar och intervjuer har gjorts med personal på anläggningen i Jönköping. Den insamlade empirin har med hjälp av vedertagen teori inom området gjort att frågeställningarna har kunnat besvaras. I examensarbetet finns den övergripande livscykelkostnadsmodellen redovisad. Modellen består av fyra huvudkategorier. Dessa är: Reparation och underhåll (C OI), Testutrustning (COM2), Teknisk support (COM1) samt Avveckling (CD). Under dessa huvudkategorier görs sedan olika kostnadsnedbrytningar. Modellen valideras också mot ett befintligt projekt på företaget för att stärka att validiteten i de kostnader som tagits upp är god. Exakta siffror visas inte då dessa är sekretessbelagda. I diskussionsdelen framgår det att modellen har uppfyllt sitt syfte men att den kan utvecklas vidare för att ge en mer detaljerad bild av specifika kostnader inom de olika områdena.

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31

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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32

Lemmer, Edward Charles. "Wind-electric pump system design." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/2527.

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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2009.
The aim of this study is to analyse the operation of a wind-electric pumping system (WEPS) as an alternative to conventional mechanical wind pumps for application in stand-alone water-pumping schemes. The steady-state as well as the dynamic operation of such a system is analysed. Through these analyses, practical guidelines are given in the design and sizing of the different system components to ensure efficient and reliable operation. Theoretical analyses are supported by measured results conducted on a small scale wind-electric pump system. The limitations involved in the design and implementation of a large scale wind-electric pump system are presented through a case study. It is firstly concluded that small-scale wind-electric pump systems have the potential of offering superior performance and flexibility to conventional mechanical wind pumps. It is secondly concluded that large-scale wind-electric pump systems are best suited, in terms of economic and practical feasibility, to pumping applications with low pressures and medium to high wind regimes at the turbine installation site.

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33

Shin, Hyun Woo. "A hybrid electronic nose system for monitoring the quality of potable water." Thesis, University of Warwick, 1999. http://wrap.warwick.ac.uk/111031/.

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This PhD thesis reports on the potential application of an electronic nose to analysing the quality of potable water. The enrichment of water by toxic cyanobacteria is fast becoming a severe problem in the quality of water and a common source of environmental odour pollution. Thus, of particular interest is the classification and early warning of toxic cyanobacteria in water. This research reports upon the first attempt to identify electronically cyanobacteria in water. The measurement system comprises a Cellfacts instrument and a Warwick e-nose specially constructed for the testing of the cyanobacteria in water. The Warwick e- nose employed an array of six commercial odour sensors and was set-up to monitor not only the different strains, but also the growth phases, of cyanobacteria. A series of experiments was carried out to analyse the nature of two closely related strains of cyanobacteria, Microcystis aeruginosa PCC 7806 which produces a toxin and PCC 7941 that does not. Several pre-processing techniques were explored in order to remove the noise factor associated with running the electronic nose in ambient air, and the normalised fractional difference method was found to give the best PCA plot. Three supervised neural networks, MLP, LVQ and Fuzzy ARTMAP, were used and compared for the classification of both two strains and four different growth phases of cyanobacteria (lag, growth, stationary and late stationary). The optimal MLP network was found to classify correctly 97.1 % of unknown non-toxic and 100 % of unknown toxic cyanobacteria. The optimal LVQ and Fuzzy ARTMAP algorithms were able to classify 100% of both strains of cyanobacteria. The accuracy of MLP, LVQ and Fuzzy ARTMAP algorithms with 4 different growth phases of toxic cyanobacteria was 92.3 %, 95.1 % and 92.3 %, respectively. A hybrid e-nose system based on 6 MOS, 6 CP, 2 temperature sensors, 1 humidity sensor and 2 flow sensors was finally developed. Using the hybrid system, data were gathered on six different cyanobacteria cultures for the classification of growth phase. The hybrid resistive nose showed high resolving power to discriminate six growth stages as well as three growth phases. Even though time did not permit many series of the continuous monitoring, because of the relatively long life span (30-40 days) of cyanobacteria, improved results indicate the use of a hybrid nose. The HP 4440 chemical sensor was also used for the discrimination of six different cyanobacteria samples and the comparison with the electronic nose. The hybrid resistive nose based on 6 MOS and 6 CP showed a better resolving power to discriminate six growth stages as well as three growth phases than the HP 4440 chemical sensor. Although the mass analyser detects individual volatile chemicals accurately, it proves no indication of whether the volatile is an odour. The results demonstrate that it is possible to apply the e-nose system for monitoring the quality of potable water. It would be expected that the hybrid e-nose could be applicable to a large number of applications in health and safety with a greater flexibility.

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34

SINGH, ARUN K. "ELECTRONIC SIMULATION IN CONSTRUCTION." University of Cincinnati / OhioLINK, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1014666670.

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35

Visser, Schalk W. J. (Schalk Willem Jacobus). "Data capturing system using cellular phone, verified against propagation models." Thesis, Stellenbosch : University of Stellenbosch, 2004. http://hdl.handle.net/10019.1/16462.

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Thesis (MScIng)--University of Stellenbosch, 2004.
ENGLISH ABSTRACT: Data capturing equipment are an expensive part of testing the coverage of a deployed or planned wireless service. This thesis presents the development of such a data capturing system that make use of 1800MHz GSM base stations as transmitters and a mobile phone connected to a laptop as receiver. The measurements taken, are then verified against know propagation models. Datavaslegging toerusting wat gebruik word om die dekking van draadlose stelsels te toets is baie duur en moeilik bekombaar. Hierdie tesis beskryf die ontwikkeling van so ’n datavaslegger wat baie goedkoper is en maklik gebruik kan word. Dit maak gebruik van ’n sellulêr foon en GPS gekoppel aan ’n skootrekenaar, wat die ontvanger is. Cell C basis staties word gebruik as die senders. Die data wat gemeet is word dan geverifieer deur gebruik te maak van bestaande radio frekwensie voortplanting modelle.

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36

Rust, Johannes Stephanus Warnich. "Upgrading of a radar system to implement a firmware based pulse compressor." Thesis, Stellenbosch : Stellenbosch University, 2007. http://hdl.handle.net/10019.1/21756.

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Анотація:

Thesis (MScIng)--University of Stellenbosch, 2007.
ENGLISH ABSTRACT: This project investigates the improvement of an existing radar system by means of currently available technologies and signal processing techniques. Upgrades are aimed to improve the system's speci cations with focus on range resolution. Pulse compression and Doppler processing techniques are used to accomplish the improvement in range resolution. The use of pulse compression however resulted in numerous modi cations to the RF sub-system required by the introduction of Direct Digital Synthesizer modules. A full replacement of the existing signal processor with a Doppler processing based signal processor implemented on a single programmable rmware device was designed. Certain sections of this signal processor were implemented and tested. Pulse compression was successfully implemented and tested in both the transceiver and signals processor sections.
AFRIKAANSE OPSOMMING: Hierdie projek ondersoek die verbetering van 'n bestaande radar stelsel deur gebruik te maak van huidige tegnologie en seinverwerking tegnieke. Aanpasings is gemik om die radarstelselspesi kasies te verbeter met die fokus op afstandsresolusie. Pulskompressie en Doppler- lter tegnieke is gebruik om 'n verbetering te maak aan die afstandsresolusie van die stelsel. Die gebruik van pulskompressie het 'n groot aantal veranderings aan die RF-stelsel genoodsaak a.g.v. die gebruik van Direkte Digitale Sintetiseerder modules. Die huidige radarseinverwerker is volledig vervang met 'n Doppler gebaseerde verwerker. Hierdie verwerker is volledig ontwerp op 'n enkele programmeerbare fermatuureenheid maar slegs sekere gedeeltes is getoets. Pulskompressie is suksesvol toegepas en getoets in beide die RF-stelsel en in die gedeeltes van die radarseinverwerker wat getoets is.

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37

Duvnjak, Zarkovic Sanja. "Security of Electricity Supply in Power Distribution System : Optimization Algorithms for Reliability Centered Distribution System Planning." Licentiate thesis, KTH, Elektroteknisk teori och konstruktion, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-281813.

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The importance of electricity in everyday life and demands to improve the reliability of distribution systems force utilities to operate and plan their networks in a more secure and economical manner. With higher demands on reliability from both customers and regulators, a big pressure has been put on the security of electricity supply which is considered as a fundamental requirement for modern societies. Thus, efficient solutions for reliability and security of supply improvements are not just of increasing interest, but also have significant socio-economic relevance. Distribution system planning (DSP) is one of the major activities of distribution utilities to deal with reliability enhancement. This thesis deals with developing optimization algorithms, which aim is to min- imize customer interruption costs, and thus maximize the reliability of the system. This is implemented either by decreasing customer interruption duration, frequency of customer interruptions or both. The algorithms are applied on a single or multi- ple DSP problems. Mixed-integer programming has been used as an optimization approach. It has been shown that solving and optimizing each one of the DSP problems contributes greatly to the reliability improvement, but brings certain challenges. Moreover, applying algorithms on multiple and integrated DSP problems together leads to even bigger complexity and burdensome. However, going toward this inte- grated approach results in a more appropriate and realistic DSP model. The idea behind the optimization is to achieve balance between reliability and the means to achieve this reliability. It is a decision making process, i.e. a trade-off between physical and pricing dimension of security of supply.

QC 20200925

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38

Molnar, Andras Mathys Zsigmond. "Development of a monitoring and data logging system for a multi-line telephone console." Thesis, Cape Technikon, 1991. http://hdl.handle.net/20.500.11838/1125.

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Thesis (Masters Diploma (Electrical Engineering)) -- Cape Technikon, Cape Town, 1991
This thesis describes the design, development and implementation of a monitoring and data logging system for a multi-line telephone console as required by the Account Enquiry section of the Department of Posts and Telecommunications.

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39

Myburgh, WT. "A remote radio transmission system to record the physiological phenomena of an equine athlete." Thesis, Cape Technikon, 1991. http://hdl.handle.net/20.500.11838/1142.

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Анотація:

Thesis (Masters Diploma(Technology) -- Cape Technikon, Cape Town, 1991
The call for the system design in this book came from a field that grew to be a part of millions of lives in this country. It is a sport which has developed to have a major infrastructure, with large sums of money involved. In fact, the money involved has made it one of the largest tax earners country wide. Due to its high development, competition has become furious and breeders will do their utmost to produce a competitor which would have the slightest edge on the next one. As most people would know by now, the discussion is about the Horse Racing Industry. During the years, owners have relied on various exercising programs and breeding of proven winners to produce new ones. To give the animal the necessary training and simply run it on experience is no longer sufficient. A more scientific approach has become necessary. There exists a need for a system whereby one could monitor certain physiological aspects of the animal. This would not only allow the physical condition of each horse to be monitored, but also allow a more effective and specialized exercise program for each individual animal to be developed, thereby not only improving its ability, but saving on time as well. Tests that were considered included ECG, temperature, and speed measurements. Existing equipment performing the first two tests require the animal to be stationary. This defeats the object of the exercise, as information should be relevant to the animal when under strain. During test periods, the ideal situation would be to allow the horse to perform its exercise routine around the track without any interference. This could best be done by monitoring all the.necessary data via a radio link and having most of the analyzing apparatus in a small and light as possible package on the animal itself.

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40

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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41

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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42

Svahn, Victor, and Andreas Johansson. "System för optisk mätning av linjeprofil." Thesis, Högskolan i Halmstad, Akademin för informationsteknologi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-44822.

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Today’s industry is moving towards a fourth revolution based on digitilizing technologies to reduce errors and streamline processes. When manufacturing hydraulicsand other pressurized systems, couplings are pressed onto pipes and hoses that mustbe able to maintain an expected pressure. If such a coupling has not been pressedcorrectly, there is a risk of leakage. This can have devastating consequences such asa liquid polluting the environment, inhalation of toxic gas, an important work stop,or a pilot losing control of an aircraft. Lantz Measuring AB therefore wants to develop a system that will be able to effectively ensure that these couplings have the correct shape around the entire couplingwith an accuracy of 0.1 mm. With this information, the manufacturer should beable to ensure that a coupling is correctly pressed. In this paper, a prototype for such a system has been developed as a contribution toa product that will meet Lantz Measuring’s requirements for accuracy, durability,and cost-effectiveness. The system is based on optical triangulation, which meanscalculating the line profile via the refraction of line lasers against the coupling usingimage sensors. Control and processing takes place with an FPGA and associatedperipherals. The prototype shows that the requirement for trueness in the measured value is met,but that there is room for improved precision. Sources of error and methods thatcontribute to improved results are presented. The work describes the developmentof the system, testing of precision, and analysis of results.
Dagens industri rör sig mot en fjärde revolution som bygger på digitaliserande teknologier för att minska fel och effektivisera processer. Vid tillverkning av hydraulik ochandra trycksatta system så pressas kopplingar på rör och slangar som måste kunnahålla ett förväntat tryck. Om en sådan koppling inte har pressats fast korrekt såfinns det risk för läckage. Detta kan ge förödande konsekvenser genom att en vätskaförorenar omgivningen, inandning av giftig gas, ett viktigt arbete stannar av, elleratt en pilot tappar kontrollen över ett flygplan. Lantz Measuring AB vill därför utveckla ett system som effektivt ska kunna säkerställa att dessa kopplingar har rätt form kring hela kopplingen med en noggrannhetpå 0,1 mm. Med denna information ska tillverkaren kunna säkerställa att en koppling är korrekt pressad. I detta arbete har en prototyp för ett sådant system utvecklats som bidrag tillen produkt som ska uppfylla Lantz Measurings krav på noggrannhet, hållbarhet,och kostnadseffektivitet. Systemet baseras på optisk triangulering, vilket innebäratt beräkna linjeprofilen via brytningen av linjelasrar mot kopplingen med hjälpav bildsensorer. Styrning och processing sker med en FPGA och tillhörande kringutrustning. Prototypen påvisar att kravet på riktighet i mätvärdet är uppfyllt, men att det finnsutrymme till förbättrad precision. Felkällor samt metoder som bidrar till förbättratresultat presenteras. Arbetet beskriver utvecklingen av systemet, test av precision,samt analys av resultat.

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43

Barnard, Jakobus Petrus. "Empirical state space modelling with application in online diagnosis of multivariate non-linear dynamic systems." Thesis, Stellenbosch : Stellenbosch University, 1999. http://hdl.handle.net/10019.1/51258.

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Dissertation (Ph.D)--University of Stellenbosch, 1999.
ENGLISH ABSTRACT: System identification has been sufficiently formalized for linear systems, but not for empirical identification of non-linear, multivariate dynamic systems. Therefore this dissertation formalizes and extends non-linear empirical system identification for the broad class of nonlinear multivariate systems that can be parameterized as state space systems. The established, but rather ad hoc methods of time series embedding and nonlinear modeling, using multilayer perceptron network and radial basis function network model structures, are interpreted in context with the established linear system identification framework. First, the methodological framework was formulated for the identification of non-linear state space systems from one-dimensional time series using a surrogate data method. It was clearly demonstrated on an autocatalytic process in a continuously stirred tank reactor, that validation of dynamic models by one-step predictions is insufficient proof of model quality. In addition, the classification of data as either dynamic or random was performed, using the same surrogate data technique. The classification technique proved to be robust in the presence of up to at least 10% measurement and dynamic noise. Next, the formulation of a nearly real-time algorithm for detection and removal of radial outliers in multidimensional data was pursued. A convex hull technique was proposed and demonstrated on random data, as well as real test data recorded from an internal combustion engine. The results showed the convex hull technique to be effective at a computational cost two orders of magnitude lower than the more proficient Rocke and Woodruff technique, used as a benchmark, and incurred low cost (0.9%) in terms of falsely identifying outliers. Following the identification of systems from one-dimensional time series, the methodological framework was expanded to accommodate the identification of nonlinear state space systems from multivariate time series. System parameterization was accomplished by combining individual embeddings of each variable in the multivariate time series, and then separating this combined space into independent components, using independent component analysis. This method of parameterization was successfully applied in the simulation of the abovementioned autocatalytic process. In addition, the parameterization method was implemented in the one-step prediction of atmospheric N02 concentrations, which could become part of an environmental control system for Cape Town. Furthermore, the combination of the embedding strategy and separation by independent component analysis was able to isolate some of the noise components from the embedded data. Finally the foregoing system identification methodology was applied to the online diagnosis of temporal trends in critical system states. The methodology was supplemented by the formulation of a statistical likelihood criterion for simultaneous interpretation of multivariate system states. This technology was successfully applied to the diagnosis of the temporal deterioration of the piston rings in a compression ignition engine under test conditions. The diagnostic results indicated the beginning of significant piston ring wear, which was confirmed by physical inspection of the engine after conclusion of the test. The technology will be further developed and commercialized.
AFRIKAANSE OPSOMMING: Stelselidentifikasie is weI genoegsaam ten opsigte van lineere stelsels geformaliseer, maar nie ten opsigte van die identifikasie van nie-lineere, multiveranderlike stelsels nie. In hierdie tesis word nie-lineere, empiriese stelselidentifikasie gevolglik ten opsigte van die wye klas van nielineere, multiveranderlike stelsels, wat geparameteriseer kan word as toestandveranderlike stelsels, geformaliseer en uitgebrei. Die gevestigde, maar betreklik ad hoc metodes vir tydreeksontvouing en nie-lineere modellering (met behulp van multilaag-perseptron- en radiaalbasisfunksie-modelstrukture) word in konteks met die gevestigde line ere stelselidentifikasieraamwerk vertolk. Eerstens is die metodologiese raamwerk vir die identifikasie van nie-lineere, toestandsveranderlike stelsels uit eendimensionele tydreekse met behulp van In surrogaatdatametode geformuleer. Daar is duidelik by wyse van 'n outokatalitiese proses in 'n deurlopend geroerde tenkreaktor getoon dat die bevestiging van dinamiese modelle deur middel van enkelstapvoorspellings onvoldoende bewys van die kwaliteit van die modelle is. Bykomend is die klassifikasie van tydreekse as 6f dinamies Of willekeurig, met behulp van dieselfde surrogaattegniek gedoen. Die klassifikasietegniek het in die teenwoordigheid van tot minstens 10% meetgeraas en dinamiese geraas robuust vertoon. / Vervolgens is die formulering van In bykans intydse algoritme vir die opspoor en verwydering van radiale uitskieters in multiveranderlike data aangepak. 'n Konvekse hulstegniek is V:oorgestel en op ewekansige data, sowel as op werklike toetsdata wat van 'n binnebrandenjin opgeneem is, gedemonstreer. Volgens die resultate was die konvekse hulstegniek effektief teen 'n rekenkoste twee grootte-ordes kleiner as die meer vermoende Rocke en Woodrufftegniek, wat as meetstandaard beskou is. Die konvekse hulstegniek het ook 'n lae loopkoste (0.9%) betreffende die valse identifisering van uitskieters behaal. Na aanleiding van die identifisering van stelsels uit eendimensionele tydreekse, is die metodologiese raamwerk uitgebiei om die identifikasie van nie-lineere, toestandsveranderlike stelsels uit multiveranderlike data te omvat. Stelselparameterisering is bereik deur individuele ontvouings van elke veranderlike in die multidimensionele tydreeks met die skeiding van die gesamenlike ontvouingsruimte tot onafhanklike komponente saam te span. Sodanige skeiding is deur middel van onafhanklike komponentanalise behaal. Hierdie metode van parameterisering is suksesvc1 op die simulering van bogenoemde outokatalitiese proses toegepas. Die parameteriseringsmetode is bykomend in die enkelstapvoorspelling van atmosferiese N02-konsentrasies ingespan en sal moontlik deel van 'n voorgestelde omgewingsbestuurstelsel vir Kaapstad uitmaak. Die kombinasie van die ontvouingstrategie en skeiding deur onafhanklike komponentanalise was verder ook in staat om van die geraaskomponente in die data uit te lig. Ten slotte is die voorafgaande tegnologie vir stelselidentifikasie op die lopende diagnose van tydsgebonde neigings in kritiese stelseltoestande toegepas. Die metodologie is met die formulering van 'n statistiese waarskynlikheidsmaatstaf vir die gelyktydige vertolking van multiveranderlike stelseltoestande aangevul. Hierdie tegnologie is suksesvol op die diagnose van die tydsgebonde verswakking van die suierringe in 'n kompressieontstekingenj in tydens toetstoestande toegepas. Die diagnostiese resultate het die aanvang van beduidende slytasie in die suierringe aangedui, wat later tydens fisiese inspeksie van die enjin met afloop van die toets, bevestig is. Die tegnologie sal verder ontwikkel en markgereed gemaak word.

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44

Main, Ian Cameron. "Development of a system to measure marine turbulence." Master's thesis, University of Cape Town, 1989. http://hdl.handle.net/11427/6917.

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Bibliography: leaves 109-113.
Various transducers have been developed turbulent shear in the ocean. The airfoil probe with it's piezoceramic beam encapsulated in a rubber airfoil has the simplest electronic processing system. However, the beam is very fragile and displays unpredictable thermal effects. An airfoil probe with semiconductor strain gauges on an aluminium cantilever beam has been developed as an alternative to the piezoceramic beam. The probe was calibrated by exciting it with a known shear generated by the water flow from an oscillating nozzle. During the calibration the thermal sensitivity of the probe was established to be -1.7 % °C-1• The probe, along with it's high gain, low noise processing system, is fitted to a tethered free-fall vehicle. A solid state data logger situated in the vehicle is used to record the data generated by the turbulence probe and a pressure transducer. Field trials at St.Helena Bay and Hout Bay showed that the sensitivity of the system is 20 dB lower than that of similar systems using piezoceramic beams. The system is able to resolve turbulent dissipation levels above 10-8 W kg-1, making it useful in regions characterised by a typical mixed layer (dissipation level of 10-W kg-1); however, it's sensitivity is not adequate for deep sea measurements where dissipation levels may be as low as 10-10 W kg-1.

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45

Wild, Mark Andrew. "Interactions at the head-tape interface of a linear tape system." Thesis, Aston University, 2001. http://publications.aston.ac.uk/7994/.

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Many of the recent improvements in the capacity of data cartridge systems have been achieved through the use of narrower tracks, higher linear densities and continuous servo tracking with multi-channel heads. These changes have produced new tribological problems at the head/tape interface. It is crucial that the tribology of such systems is understood and this will continue since increasing storage capacities and faster transfer rates are constantly being sought. Chemical changes in the surface of single and dual layer MP tape have been correlated to signal performance. An accelerated tape tester, consisting of a custom made cycler ("loop tester"), was used to ascertain if results could be produced that were representative of a real tape drive system. A second set of experiments used a modified tape drive (Georgens cycler), which allowed the effects of the tape transport system on the tape surface to be studied. To isolate any effects on the tape surface due to the head/tape interface, read/write heads were not fitted to the cycler. Two further sets of experiments were conducted which included a head in the tape path. This allowed the effects of the head/tape interface on the physical and chemical properties of the head and tape surfaces to be investigated. It was during the final set of experiments that the effect on the head/tape interface, of an energised MR element, was investigated. The effect of operating each cycler at extreme relative humidity and temperature was investigated through the use of an environmental chamber. Results showed that cycling improved the signal performance of all the tapes tested. The data cartridge drive belt had an effect on the chemical properties of the tape surface on which it was in contact. Also binder degradation occurred for each tape and appeared to be greater at higher humidity. Lubricant was generally seen to migrate to the tape surface with cycling. Any surface changes likely to affect signal output occurred at the head surface rather than the tape.

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46

Cooke, Adrian (Adrian Gerard). "Rural e-mail system for the Sumbandila satellite." Thesis, Stellenbosch : Stellenbosch University, 2007. http://hdl.handle.net/10019.1/17745.

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Thesis (MScIng)--University of Stellenbosch, 2007.
ENGLISH ABSTRACT: Keywords: digital signal processing, OSI layer, network protocols, embedded systems, satellite technology This thesis describes the design and implementation of a rural e-mail system for the Sumbandila satellite. The rural e-mail system was developed during a project sponsored by the Department of Communications of the South African government. The complete Open Systems Interconnect (OSI) layer structure of the protocol architecture used on the satellite hardware and software is described. The equivalent implementation of the OSI layer on the ground station hardware is given. This includes the adaptation of the soundmodem Open Source Software modem to work for the e-mail system’s OSI layer. The design of the Application Layer e-mail system is described and the implementation of this design using the Python, Korn Shell and C programming environments is also given. The procedures used to test the system for reliability and the use of a database to create detailed logs of the e-mail system is shown to have generated a reliable system that is easily maintained. A critical evaluation of the system is provided in the last chapter.
AFRIKAANSE OPSOMMING: Sleutelwoorde: Syferseinverwerking, OSI-lae, netwerkprotokolle, toegewyde stelsels, satelliettegnologie Hierdie tesis beskryf die ontwerp en implementering van ’n plattelandse e-posstelsel vir die Sumbandila satelliet. Die plattelandse e-posstelsel is ontwikkel in opdrag van die Departement van Kommunikasie van die Suid-Afrikaanse regering. Die volledige Open Systems Interconnect (OSI) laagstruktuur van die protokol-argitektuur wat in die satelliet se apparatuur en programmatuur gebruik is, word beskryf. Die ekwivalente implementering van die OSI-laag op die grondstasie-apparatuur word gegee, insluitende die aanpassing van soundmodem, ’n oopbronkode sagteware-modem. Hierdie sagteware-modem word gebruik in die e-posstelsel se fisiese laag. Die ontwerp van die toepassingslaag van die e-posstelsel word beskryf, asook die implementering van hierdie ontwerp met behulp van Python, die Korninterpreteerder en C. Die prosedures waarvolgens stelselbetroubaarheid getoets is, en die gebruik van ’n databasis om noukeurige joernale van e-postransaksies te hou, demonstreer dat ’n betroubare, onderhoubare stelsel gemplementeer is. In die laaste hoofstuk word die stelsel krities geevalueer.

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47

Blaauw, Deon. "Flight control system for a variable stability blended-wing-body unmanned aerial vehicle." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/2297.

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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2009.
This thesis presents the analysis, design, simulation and practical implementation of a novel control system for a variable stability blended-wing-body unmanned aerial vehicle. The aircraft has a moveable centre of mass that allows it to operate in an aerodynamically optimised minimum drag configuration during cruise flight. The primary purpose of the control system is thus to regain nominal static stability for all centre of mass positions, and then to further regulate motion variables for autonomous way point navigation. A thorough analysis of the parameters affected by the varying centre of mass position leads to the identification of the main control problem. It is shown that a recently published acceleration based control methodology can be used with minor modification to elegantly solve the variable stability control problem. After providing the details of the control system design, the customised avionics used for their practical implementation are presented. The results of extensive hardware in the loop simulations verify the functionality of the controllers. Finally, flight test results illustrate the practical success of the autopilot and clearly show how the control system is capable of controlling the variable stability aircraft at centre of mass locations where a human pilot could not.

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48

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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49

Shafique, Hamza. "On Development and Optimization of Energy Management System (EMS) for Battery Energy Storage System (BESS) : Providing Ancillary Services." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-289630.

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The battery energy storage systems (BESS) installed standalone and with solar photovoltaic installations can be used beyond just storing excess generated electricity from the solar panels. The BESS can be intelligently managed by an Energy Management System (EMS) that uses the BESS resource for multiple ancillary services. The hypothesis in this study is that by optimizing the distribution of BESS resource between peak shaving of local load and providing frequency regulation service through the reserve market additional value can be generated from the already present resource. The EMS designed during the course of this thesis consists of two main parts, first the Prognosis Module that forecasts and makes recommendation for the delivery of hourly service from the BESS with quantified uncertainty and, second the Realtime Operation Module that takes the recommendations from the Prognosis Module and dispatches the necessary service meanwhile correcting for the uncertainty from the Prognosis Module. The Prognosis Module of the EMS is tested through the Öckero Ice Rink case study. In the case study local peak shaving saves 9.5% of the monthly power tariff by reducing its demand component through shaving the peak power of the test day by 21%. The EMS also allows for profit generation by frequency regulation through reserving capacity for three hourly slots within the test day on the reserve market.
Ett batterilager installerat separat eller tillsammans med en solelanläggning kan användas för mer än att öka egenanvändning av solel. Smart styrning med ett Energy Management System (EMS) möjliggör leverans av systemtjänster från batterilagret till elnätet. Hypotesen i denna studie innefattar att optimering av distributionen av ett energilagers kapacitet mellan kapning av effekttoppar och leverans av systemtjänsten frekvensreglering innebär en ökning av resursens värde. EMS som designats under detta projekt består av två delar; dels en prognosmodul som prognostiserar energianvändning för att ge rekommendationer för distribuering av kapacitet, dels en modul som i realtid styr batteriet baserat på prognosmodulens rekommendationer och uppmätt data. Prognosmodulen har testats i en fallstudie av Öckerö Ishall. Fallstudiens resultat visar att EMS som konstruerats reducerar nätavgiften med 9,5% genom att minska dagens högsta effekttopp med 21%. Resultatet visar även att frekvensreglering kunde levereras under tre timmar samma dag, vilket skulle generera ytterligare intäkter.

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50

Deese, Anthony Steven Nwankpa Chika O. "Analog methods for power system analysis and load modeling /." Philadelphia, Pa. : Drexel University, 2008. http://hdl.handle.net/1860/2822.

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