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Dissertations / Theses on the topic 'Digital information and control system'
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Broos, Elizabeth. "Information, communication and technological competencies in a digital working environment a case study in the Netherlands Defence Organization /." Pretoria : [s.n.], 2007. http://upetd.up.ac.za/thesis/available/etd-06182008-115804/.
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Carlsson, Olivia. "Auktorisering i system för digitalt bevarande." Thesis, Mittuniversitetet, Institutionen för informationssystem och –teknologi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-37260.
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The purpose is to investigate, analyze and clarify the relationship between authorization and security policy for digital preservation system. Information security comes into focus when digital preservation systems are discussed. The handling of electronic documents in digital preservation systems is now widespread and a large part of many activities. This means that the business must ensure that it protects against the loss of information stored in the digital preservation system. Authorization and security policy are relevant to archive and information science because digital objects in digital preservation system are to be protected from unauthorized access. With a qualitative method the research will go through security policy, systems and models for access architecture. With open approach and open questions, the research will be summarized with a discussion on the most important conclusions for access management for digital preservation system, which are mainly built on roles. It is of great importance that the company uses roles and authorization levels to ensure that everyone knows with certainty what to do and what they cannot do.<br>Syftet är att undersöka, analysera och klargöra relationen mellan auktorisering och säkerhetspolicy för system för digitalt bevarande. Informationssäkerhet kommer i fokus när system för digitalt bevarande diskuteras. Hanteringen av elektroniska dokument i system för digitalt bevarande är nu utbrett och en stor del av många aktiviteter. Det innebär att verksamheten måste se till att den skyddar mot förlust av information som lagras i system för digitalt bevarande. Auktorisering och säkerhetspolicy är relevant för arkiv- och informationsvetenskap eftersom digitala objekt i system för digitalt bevarande ska skyddas mot obehörig åtkomst. Med en kvalitativ metod kommer forskningen att gå igenom säkerhetspolicy, system och modeller för åtkomstarkitektur. Med öppet tillvägagångssätt och öppna frågor kommer forskningen slutligen att sammanfattas med en diskussion om de viktigaste slutsatserna för åtkomsthantering för system för digitalt bevarande, som huvudsakligen bygger på roller. Det är av stor vikt att företaget använder roller och auktoriseringsnivåer för att säkerställa att alla med säkerhet vet vad de ska göra och vad de inte får göra.
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kalle, Sushma. "Semantic-aware Stealthy Control Logic Infection Attack." ScholarWorks@UNO, 2018. https://scholarworks.uno.edu/td/2512.
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In this thesis work we present CLIK, a new, automated, remote attack on the control logic of a programmable logic controller (PLC) in industrial control systems. The CLIK attack modifies the control logic running in a remote target PLC automatically to disrupt a physical process. We implement the CLIK attack on a real PLC. The attack is initiated by subverting the security measures that protect the control logic in a PLC. We found a critical (zero-day) vulnerability, which allows the attacker to overwrite password hash in the PLC during the authentication process. Next, CLIK retrieves and decompiles the original logic and injects a malicious logic into it and then, transfers the infected logic back to the PLC. To hide the infection, we propose a virtual PLC that engages the software the virtual PLC intercepts the request and then, responds with the original (uninfected) control logic to the software.
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Lloyd, Natasha. "Clutter Measurement and Reduction for Enhanced Information Visualization." Digital WPI, 2006. https://digitalcommons.wpi.edu/etd-theses/67.
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The effectiveness of information visualization largely depends on the ease and accuracy with which users can access the information. Visual clutter in a display can detract from a user's ability to properly read the information. An ideal visualization needs to maximize the visibility of patterns and structure and minimize the clutter present. Thus far, there has been surprisingly little work done in finding quantitative ways to measure clutter in information visualizations. The goal of this project was to create clutter measurement and reduction techniques that minimize the presence of visual clutter and maximize a user's ability to accurately read the data. These methods were tested and evaluated on a number of visualizations depicting domestic air traffic data.
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Britton, Matthew Scott. "Stochastic task scheduling in time-critical information delivery systems." Title page, contents and abstract only, 2003. http://web4.library.adelaide.edu.au/theses/09PH/09phb8629.pdf.
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"January 2003" Includes bibliographical references (leaves 120-129) Presents performance analyses of dynamic, stochastic task scheduling policies for a real- time-communications system where tasks lose value as they are delayed in the system.
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Gajanayake, Mudiyanselage Nuwan Randike. "Practical issues when designing an information accountability framework for eHealth systems." Thesis, Queensland University of Technology, 2013. https://eprints.qut.edu.au/60726/1/Randike_Gajanayake_Thesis.pdf.
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This thesis is the result of an investigation into information privacy management in eHealth. It explores the applicability of accountability measures as a means of protection of eHealth consumer privacy. The thesis presented a new concept of Accountable eHealth Systems for achieving a balance between the information privacy concerns of eHealth consumers and the information access requirements of healthcare professionals and explored the social, technological and implementation aspects involved in such a system.
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Caetano, Diogo Gará 1978. "Analise de desempenho de sistemas de TV digital moveis DVB-H e ISDB-T utilizando concatenação de codigos BCH e turbo codificadores." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260060.
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Orientador: Yuzo Iano<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação<br>Made available in DSpace on 2018-08-11T08:32:05Z (GMT). No. of bitstreams: 1
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Previous issue date: 2007<br>Resumo: O objetivo deste trabalbo foi estudar o desempenho de codificadores de canal com decodificação iterativa e diferentes esquemas de concatenação de codificadores para sistemas de TV digital móveis tais como: DVB-H e ISDB- T. Contribui-se com uma proposta de concatenação de codificadores para sistemas COFDM avaliada através de implementação computacional. Os resultados gerados nesta pesquisa demonstram ganhos de codificação em relação a sistemas padronizados de TV digital. Estes ganhos de codificação são referentes à utilização de codificadores BCH concatenados com codificadores Turbo e LDPC. As simulações ocorreram em canais com multipercurso, distribuição Rayleigh, ruído gaussiano branco e outros canais típicos de radiodifusão utilizados no Brasil para testes de TV digital<br>Abstract: The aim of this work is to study the performance of channel encoders with iterative decoder: and also different encoders concatenation schemes to mobile digital television standards ;; DVB-H and ISDB-T. The contribution of this work is a proposal of encoder concatenatic scheme for COFDM systems evaluated through software implementation. The final results I this work presents overall coding gain with respect to digital TV standards. The gain presenb in this work is regarded to the concatenation of BCH encoders with Turbo and LDPC encodel The simulations were performed over multipath, Rayleigh, A WGN and typical Brazili: broadcast channels used for digital TV trials<br>Mestrado<br>Telecomunicações e Telemática<br>Mestre em Engenharia Elétrica
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Roseno, Edison. "Sistema P??blico de Escritura????o Digital - SPED Cont??bil : impactos nas pr??ticas de controle interno e gest??o de riscos de empresas participantes do projeto piloto da Receita Federal." FECAP - Faculdade Escola de Com??rcio ??lvares Penteado, 2012. http://132.0.0.61:8080/tede/handle/tede/505.
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Previous issue date: 2012-05-30<br>Accounting in Brazil has undergone profound changes with the recent adaptation to international standards and because of the constant process of computerization of accounting and tax imposed by tax legislation, arises in this context called the \"SPED\", Public Digital Bookkeeping System, created by the Federal Government in 2007, to replace manual bookkeeping paper to digital. Once put into operation the system, companies subject to the delivery of these bonds will provide information via digital files to government oversight (City, State and Federal). With the implementation of these projects, companies will experience significant impacts in their practices Internal Control and Risk Management. Against this backdrop, this study aimed to: \"Check in the perception of the interviewees, to what extent were affected practices Internal Controls and Risk Management of three companies participating in the Pilot Project of the Internal Revenue Service in the implementation of SPED Accounting.\" To achieve this qualitative study was undertaken of documentary and bibliographic character. Data were obtained from the three professional companies that participated in the pilot project, collected using an interview script, with analysis of the results assessed by the technique of content analysis. It was found that the main impacts on the deployment layout Accounting SPED were the adaptation of integrated systems and the transition of the Chart of Accounts of the Company with the Chart of Accounts Reference imposed by the government due to the large volume of information generated in the systems. The survey found that companies practiced a policy of internal controls, in order to monitor and control departmental procedures and measured the risks incurred in the implementation of Accounting SPED. As for risk management, it was found that at the time of project implementation SPED Accounting, had not adopted policies to measure and mitigate the flow of information in the consolidated accounting and tax accounting<br>A Contabilidade brasileira tem passado por profundas altera????es com a recente adequa????o ??s normas internacionais e devido ao constante processo de informatiza????o dos processos cont??beis e fiscais impostos pela legisla????o tribut??ria. Surge neste contexto o chamado \"SPED\", Sistema P??blico de Escritura????o Digital, criado pelo Governo Federal em 2007, para substituir a escritura????o manual em papel para a digital. Uma vez implatado o sistema, as Empresas sujeitas ?? entrega dessas obriga????es fornecer??o informa????es por meio de arquivos digitais aos ??rg??os governamentais de fiscaliza????o (Municipal, Estadual e Federal). Com a implanta????o desses projetos, as empresas sofrer??o significativos impactos em suas pr??ticas de Controle Interno e Gest??o de Riscos. Diante desse cen??rio, a presente pesquisa teve como objetivo: \"Verificar na percep????o dos sujeitos entrevistados, em que medida foram afetadas as pr??ticas de Controles Internos e Gest??o de Riscos de tr??s empresas participantes do Projeto Piloto da Receita Federal na implanta????o do SPED Cont??bil\". Para atingir este objetivo foi realizada pesquisa qualitativa, de carater documental e bibliogr??fico. Os dados foram obtidos junto a profissionais das tr??s empresas que participaram do projeto piloto, coletados por meio de um roteiro de entrevista, com an??lises dos resultados avaliados pela t??cnica de an??lise de conte??do. Constatou-se que os principais impactos na implanta????o ao layout do SPED Cont??bil foram a adapta????o dos sistemas integrados e a transi????o do Plano de Contas da Empresa com o Plano de Contas Referencial imposto pelo Governo, devido ao grande volume de informa????es geradas nos sistemas. A pesquisa constatou que as empresas praticavam a politica de controles internos, com objetivo de fiscalizar e controlar os procedimentos internos dos departamentos e que mensuravam os riscos ocorridos na implanta????o do SPED Cont??bil. Quanto ?? gest??o de riscos, constatou-se que na ??poca da implanta????o do projeto SPED Cont??bil, n??o havia pol??ticas adotadas para mensurar e mitigar os riscos dos fluxos das informa????es cont??beis e fiscais consolidadas na Contabilidade
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El, Busch Charles. "A Fully Digital Antenna Control System." International Foundation for Telemetering, 1989. http://hdl.handle.net/10150/614538.
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International Telemetering Conference Proceedings / October 30-November 02, 1989 / Town & Country Hotel & Convention Center, San Diego, California<br>Antenna control systems are typically a combination of digital time domain algorithms for relatively simple mathematical operations followed by analog frequency domain filtering for mechanical resonance compensation. This paper presents an innovative, fully digital control system that utilizes the advantages of both modern sampled time domain control methods and classical frequency domain conceptualization.
The unit is designed to perform all functions of the antenna control problem in the digital domain including generation of command coordiantes, position, rate, torque loop closure, servo compensation, and torque bias processing. Problems related to analog processing such as offsets, drift, and dynamic range are completely avoided in the digital domain. Non-linear and adaptive filtering is used to correct system non-linearities due to saturation, backlash, friction, and dead band. Rate and acceleration limiting is provided in the digital processing along with an optimal state estimator that is used to dramatically decrease system servo errors for dynamic targets. Digital filtering is accomplished by utilizing an internal bi-linear transform between the frequency domain input parameters familiar to most control engineers and the cascaded z-transform filter coefficients used by the control algorithms. All control and servo control parameters are programmed into the units’ nonvolatile memory by the control engineer using an interactive terminal attached to a service port. Changes to the servo compensation that often required hours of analysis and electronic component changes can now be effected and evaluated in seconds.
Final outputs from the unit are motor drive commands that are converted to analog form for power amplifier use. All control and status communication between the unit and a host computer or operator console is via a high speed, fiber optic, serial data link.
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Kang, Keunmo. "Information in coordinated system control." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2008. http://wwwlib.umi.com/cr/ucsd/fullcit?p3320961.
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Thesis (Ph. D.)--University of California, San Diego, 2008.<br>Title from first page of PDF file (viewed October 3, 2008). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 120-123).
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De, Oliveira Maria Cristina Ferreira. "CAD tools for digital control." Thesis, Bangor University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.238368.
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Madail, Jorge Miguel Sarrico. "Herd control system." Master's thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/22751.
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Mestrado em Engenharia Electronica e Telecomunicações<br>The way vineyards are organized brings up the need of removing the creepers
that compete with vines for solar exposition and nutrients. Until now,
the use of machines and herbicides has been the adopted solution but these
techniques are aggressive for the environment and for this reason, new alternatives
have to be found
During the years several techniques have been developed to control herds,
once these animals can replace the man in di erent tasks, for example,
forest cleaning. This type of animals can reach places where machines can
not and the present vegetation is part of their diet
This dissertation builds up on the concept of virtual fence, extending it with
a set of new functionalities that aim to adapt this type of technology to
the characteristics of speci c crops, such as viticulture. The work carried
out has focused both on the technological aspects, such as sensing and
localization technologies, as well as on the economic aspects. In this latter
case, the aim is to obtain a low cost system that can be massi ed.<br>O modo como as vinhas se encontram organizadas faz com que seja
necessario remover as plantas mais rasteiras que competem com as videiras
por exposição solar e nutrientes. Ate agora, o uso de maquinas e herbicidas
tem sido a soluçao adoptada, mas estas tecnicas sao agressivas para o
ambiente, sendo necessario encontrar outras alternativas.
Ao longo dos anos varias tecnicas foram desenvolvidas para controlar rebanhos,
uma vez que estes animais podem substituir o homem em diversas
tarefas, como por exemplo, limpeza das florestas. Este tipo de animais consegue
chegar a sítios onde algumas maquinas não conseguem e a vegetação
presente faz parte da sua dieta.
No âmbito desta dissertação tomou-se como base o conceito de cerca virtual,
desenvolvendo-se um conjunto de novas funcionalidades que têm por
objectivo adaptar este tipo de tecnologia as características de culturas especificas, como por exemplo a vitivinicultura. O trabalho realizado versou
quer a vertente tecnológica, nomeadamente tecnologias de sensorização e
localização, que a vertente económica, tendo-se neste caso por objetivo
obter um sistema de baixo custo, que possa ser massificado.
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Gregory, Robert p. "Digital control of a MBE deposition system." Thesis, University of Manchester, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.237668.
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Schultz, Aaron M. "Digital control of contactless battery charging system." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/37031.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.<br>Includes bibliographical references (leaves 230-234).<br>by Aaron M. Schultz.<br>Ph.D.
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Škrabal, Tomáš. "Studie návrhu přírodě blízkých protierozních a protipovodňových opatření v povodí Jičínky." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-226136.
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The main subject of this diploma thesis is a study of a suggestion of environmentally friendly adjustments in the basin of Jičínka, working as preventive protection against floods. The study contains a research of the stated area using the method of CN-curves in the hydrological model DesQ-MaxQ and the principle of Wischmeier-Smith's equation, in modicication of ArcGIS programme. Based on the analysis, the work suggests an improvement of erosive and drain ratios and then an assessment of effectiveness of the protection. We get the assessment of the effectiveness by comparing the condition of the erosive wash and the surface drain before and after implementation of our measures. The work also sets its goal in calculating the financial returnability of the investition indicatively.
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Wort, Ralph George. "Integrated information system for quality control." Thesis, University of the West of England, Bristol, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283909.
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Klein, Grant. "Digital traffic information using the radio data system." Thesis, University of Nottingham, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282622.
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Saleh, Majd. "Digital ecosystem : towards a system of information systems." Thesis, Compiègne, 2018. http://www.theses.fr/2018COMP2413.
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Récemment, avec les progrès technologiques rapides que nous observons dans le domaine des Technologies de l'Information et de la Communication (TIC), de nombreux Systèmes d'Information (SI) sont introduits dans nos vies à la maison ou au travail. Cela entraînera des défis croissants pour les utilisateurs, tels que la nécessité de gérer d'énormes quantités de ressources et la difficulté de collaborer avec les autres. Afin de trouver la bonne information au bon moment pour prendre des décisions éclairées, les utilisateurs doivent rechercher des ressources réparties dans de nombreux SI (courriels, réseaux sociaux, pages wiki, notes électroniques, etc.). Le processus de recherche de ressources dans différents SI est coûteux et prend du temps; il doit donc être optimisé. L'émergence des Écosystèmes Numériques (DE) offre aux utilisateurs le potentiel d'améliorer l'accessibilité et la coordination des différents systèmes.D'autre part comparable à un DE, un système de systèmes d'information (SoIS) est composé de SI intégrés qui sont hétérogènes et fonctionnent indépendamment de manière autonome, mais qui sont mis en réseau pour un objectif commun.L'objectif mentionné précédemment, pourrait être l'organisation et le partage de ressources hétérogènes. Cette thèse se concentre sur le passage des Écosystèmes Numériques à un système de systèmes d'information en tant que solution aux défis émergents auxquels sont confrontés les utilisateurs de différents SI dans un contexte de collaboration. Le SoIS donne l'occasion d'explorer comment la collaboration peut être améliorée grâce à une combinaison de différents SI dans l'environnement numérique des organisations. Dans ce contexte, nous avons défini un modèle sémantique et un modèle architectural de SoIS. Nous avons ensuite développé un prototype, appelé MEMORAeSoIS, basé sur ces modèles comme support de collaboration. Ce prototype peut offrir la possibilité d'indexer, de partager, d'annoter et de recommander des ressources importantes provenant de différents SI<br>Recently, with the rapid technological advancement that we are witnessing in the domain of Information and Communication Technology (ICT), many Information Systems (ISs) are introduced into our lives either at home or at work. That will cause growing challenges for the users, such as the need for managing huge amounts of resources and the difficulty to collaborate with others. In order to find the right information at the right time to make educated decisions, users have to look for resources distributed in many ISs (emails, social networks, wiki pages, electronic notes etc.). The process of searching for resources in different ISs is costly and time-consuming; therefore it needs to be optimized. The emergence of Digital Ecosystems (DE) presents the users with the potential for improving the accessibility and coordination of different systems. On the other hand, comparable to DE, a System of Information Systems (SoIS) is comprised of integrated ISs which are heterogeneous and independently operable on their own but are networked together for a common goal. The goal, as mentioned before, might be organizing and sharing of heterogeneous resources.This thesis focuses on moving from Digital Ecosystems towards a System of Information Systems as a solution to the emergent challenges facing users of different ISs in a collaboration context. The SoIS gives the opportunity to explore how collaboration can be enhanced through a combination of different ISs in the digital environment of organizations. In this context, we defined a semantic model and an architectural model of SoIS. We then developed a prototype, called MEMORAeSoIS, based on these models as collaboration support. This prototype can provide the ability to index, share, annotate, and recommend important resources coming from different ISs.Recently, with the rapid technological advancement that we are witnessing in the domain of Information and Communication Technology (ICT), many Information Systems (ISs) are introduced into our lives either at home or at work. That will cause growing challenges for the users, such as the need for managing huge amounts of resources and the difficulty to collaborate with others. In order to find the right information at the right time to make educated decisions, users have to look for resources distributed in many ISs (emails, social networks, wiki pages, electronic notes etc.). The process of searching for resources in different ISs is costly and time-consuming; therefore it needs to be optimized. The emergence of Digital Ecosystems (DE) presents the users with the potential for improving the accessibility and coordination of different systems. On the other hand, comparable to DE, a System of Information Systems (SoIS) is comprised of integrated ISs which are heterogeneous and independently operable on their own but are networked together for a common goal. The goal, as mentioned before, might be organizing and sharing of heterogeneous resources.This thesis focuses on moving from Digital Ecosystems towards a System of Information Systems as a solution to the emergent challenges facing users of different ISs in a collaboration context. The SoIS gives the opportunity to explore how collaboration can be enhanced through a combination of different ISs in the digital environment of organizations. In this context, we defined a semantic model and an architectural model of SoIS. We then developed a prototype, called MEMORAeSoIS, based on these models as collaboration support. This prototype can provide the ability to index, share, annotate, and recommend important resources coming from different ISs
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Yogendran, G. Henry. "Real time digital control system for power system analog simulator." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ53246.pdf.
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Switzer, Earl R., and Erwin H. Straehley. "Edwards Digital Switch System Overview." International Foundation for Telemetering, 1992. http://hdl.handle.net/10150/611928.
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International Telemetering Conference Proceedings / October 26-29, 1992 / Town and Country Hotel and Convention Center, San Diego, California<br>The Edwards Digital Switch (EDS) is a digital communication system that provides advanced voice networking capabilities to the Edwards Test Range. The EDS is a member of a new family of all-digital switching systems that internally handle data in digital form. To accommodate analog voice and data circuits, conversions between analog and digital formats occur at the system interfaces. The EDS consists of six groups of configuration items: System-level control and monitoring is centralized in the Control and Display Subsystem. Workstations provide subsystem-level control and monitoring. The Central Switching Subsystem, as the primary interface with the range environment, provides system connectivity to radios, telephone circuits, and communications links to other facilities. It integrates the EDS with links to the Control Room Switching Subsystems. Each Control Room Switching Subsystem connects individual user stations within a Mission Control Room or other localized area. The user equipment element consists of a Subscriber Terminal Unit, Channel Expander, and interface panels for headsets, foot switches, and speakers. The Remote Radio Control Unit optimizes usage of available frequencies, allowing control of tunable radios from the Control and Display Subsystem. *The original name, Edwards Communication Switching System (ECSS) was changed to Edwards Digital Switch (EDS) in 1990. The Site Selection Unit facilitates the handover of voice communications between receiver sites when a long-range test is monitored. The system architecture is based on a central system-level control element, a central switch, multiple subsystem-level control elements, multiple subsystem switches, and end-equipment items that are interconnected through the switch network. The EDS combines multiple voice communications applications in a single system. The system is being expanded to integrate voice and data switching. Its major function is support of multiparty networked voice communications within Mission Control Rooms and between other test participants. Other voice functions are an intercom capability including both Direct Access (hot line) and Indirect Access (dial-up), subscriber loop connections to the base-level telephone exchange, and the Public Switched Network System. Digital interfaces allow integration of ciphertext data and Time Space Position Information data switching functions. A system based on the EDS design has also been installed by the Air Force at Eglin AFB. Engineering studies for systems that make use of the EDS design are currently underway by the Navy at China Lake and the Army at White Sands Missile Range. The EDS project office has actively pursued promising program management concepts such as: specifying nondevelopmental items, requiring industry standard interconnectivity and interoperability, and using a multiyear fixed-price requirements-type contract to encourage multiservice participation.
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Sparks, Kelly Christina. "Arkansas soils information system (ARK-SIS) : an interactive, web-based soils information system using digital geographic soils databases /." To access the ARK-SIS database described in this thesis:, 2000. http://kalmia.uark.edu.
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Vikamaa, T. (Teemu). "Embedded programmable soft-core control subsystem for digital front-end." Master's thesis, University of Oulu, 2016. http://urn.fi/URN:NBN:fi:oulu-201606042360.
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Field-programmable gate arrays (FPGAs) provide a fully reconfigurable platform for soft-core processors. Such processors can be implemented using the general-purpose programmable logic of the FPGA, alleviating the need to incorporate hard-wired processors in embedded systems where high processing power is often not a primary design requirement. An example of such embedded system is the digital radio-frequency front-end of a software-defined radio. A digital front-end (DFE) can be implemented as an FPGA-based system, with an embedded microcontroller executing various control functions. This kind of microcontroller subsystem is well suited for implementation using one or more soft processor cores. The implementation part of this thesis presents a software-programmable soft-core subsystem for a digital radio-frequency front-end. The subsystem was built around a MicroBlaze soft processor core, and it was implemented on a Xilinx Virtex-7 FPGA. The design and implementation of the subsystem were carried out using Vivado design tools, and the associated software was developed in Xilinx SDK using the C programming language. The design was composed with the IP-centric, schematic-based design methodology in Vivado IP Integrator. To verify its functionality, the subsystem was integrated into the full DFE design and tested on an ADS7-V1 evaluation board. The tests included latency measurements for automatic gain control, which is considered a soft real-time feature. However, no explicit latency constraint was defined for this particular implementation. The measurement results were compared against requirements given in the IEEE 802.11a/g specification<br>Ohjelmoitavat porttimatriisit (Field-programmable gate array, FPGA) muodostavat vapaasti muokattavan alustan ohjelmistopohjaisille mikroprosessoreille. Ohjelmistopohjaisiin mikroprosessoriytimiin pohjautuva järjestelmä voidaan toteuttaa käyttämällä FPGA:n ohjelmoitavaa logiikkarakennetta. Tällaiset toteutukset vähentävät tarvetta kovopohjaisille prosessoreille sulautetuissa järjestelmissä, joilta ei välttämättä vaadita erityisen suurta prosessointikapasiteettia. Eräs esimerkki tällaisesta sulautetusta järjestelmästä on ohjelmistoradion digitaalinen radiotaajuusetupää. Digitaalinen etupää (Digital front-end, DFE) on mahdollista toteuttaa FPGA-pohjaisena järjestelmänä, johon sisällytetään ohjaustoimintoja suorittava sulautettu mikrokontrolleri. Tällainen mikrokontrollerimoduuli on helppo toteuttaa ohjelmistopohjaisen prosessoriytimen avulla. Tämän työn käytännön osassa esitellään ohjelmistopohjainen ohjausmoduuli digitaalisen radion radiotaajuusosaan. Moduuli on rakennettu MicroBlaze-prosessoriytimen ympärille ja toteutettu Xilinxin Virtex-7 FPGA-piirillä. Moduulin suunnittelu ja synteesi tehtiin Vivado-suunnitteluohjelmistolla, ja prosessoriytimen ajama ohjelmakoodi toteutettiin C-ohjelmointikielellä Xilinx SDK -kehitysympäristössä. Moduulin suunnitteluun käytettiin Vivado IP Integratorin IP-keskistä, kaaviopohjaista suunnittelumenetelmää. IP:llä (Intellectual Property) tarkoitetaan erilaisia valmiita prosessoriytimiä, joita yhdistelemällä voidaan toteuttaa digitaalisia piirejä. Ohjausmoduulin toiminta varmennettiin integroimalla se kokonaiseen DFE-järjestelmään, jota testattiin ADS7-V1-evaluointipiirilevyllä. Testeihin kuului automaattisen vahvistusohjauksen vasteaikamittauksia. Automaattista vahvistusohjausta voidaan pitää reaaliaikaisena toimintona, mutta sen toimintanopeus ei ollut tässä järjestelmässä olennaista. Mittausten tuloksia vertailtiin IEEE 802.11a/g-spesifikaatiossa annettuihin vaatimuksiin
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Van, Niekerk Kathryn. "An efficient management system for large digital object collections." Master's thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/11413.
Full textAbstract:
Includes abstract.<br>Includes bibliographical references (leaves 87-91)<br>Cultures evolve continuously, and it is therefore vital to track and record these changes, and most importantly of all, manage the resulting huge mass of data such as images, video clips, audio recordings and documents. This thesis examines the design of a Web-based solution, hereafter referred to as the Information Management System (IMS), to handle the efficient, accurate and secure management of a large number of objects.
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Rozenes, Shai. "Multidimensional project control system." Thesis, Coventry University, 2004. http://curve.coventry.ac.uk/open/items/462120e8-7a38-a662-149a-8d8320ba4cf4/1.
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Project control systems often fail to support management in achieving their global project goals. This thesis proposes a Multidimensional Project Control System (MPCS) as an approach for quantifying deviations from the planning phase to the execution phase with respect to the global project control specification (GPCS). The projects' current state must be translated into yield terms, which are expressed as a gap vector that represents the multidimensional deviation from the global project control specification. The MPCS methodology allows the project manager to determine: integrated project status; where problems exist in the project; when and where to take corrective action; and how to measure improvement. However, implementing the MPCS methodology does not require extra data collation. MPCS deals with the control of a single project and defines the project performances in comparison with the plan. The progression of several projects in parallel is a common situation in organizations, therefore a comparison of the various project performances is required. It is proposed that a comparison process be performed using the data envelope analysis (DEA) approach. The reference points for examining the performances of different projects and the directions of improvement for the projects are not necessarily found on the efficiency frontier. An algorithm is developed for applying multi-project system control having a relatively large number of inputs and outputs while maintaining the validity of the DEA methodology. The DEA output allows the diagnosis of those found on the efficiency frontier and those that need improvement.
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Lehn, Dan. "Improving pre-surgery information with a digital information system : A qualitative case study." Thesis, Linnéuniversitetet, Institutionen för informatik (IK), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-67018.
Full textAbstract:
In today’s society, much information is utilized and distributed through information and communication technology. However, even though IT or ICT has been introduced in the healthcare sector, paper documents are still in use. Studies show that this may create an inefficient healthcare, something pre-surgical medical personnel at a medical clinic in the southern part of Sweden, are well aware of.Their problem is that an increasing number of surgical procedures are cancelled as patients fail to comply with pre-surgery information; the information provided to patients before having surgery. Pre-surgical medical personnel believe that the root to this problem comes from the way patients are given access to the information itself. Currently, this is limited to paper document, a solution that worked in the past. However, a more diverse clientele has resulted in a greater need for information access and paper documents simply cannot support this in an effective manner.Pre-surgical medical personnel believe this could be improved if the information was also made accessible through an information system. And so, the focus of the master thesis was to explore the pre-surgical medical personnel’s perception on the requirements, usage and impact of a new IS that could, subsequently, generate improvements in the accessibility and understandability of pre-surgery information.The problematic situation was approached with an interpretative qualitative case study were data was collected through three different methods so that triangulation could take place. The master thesis then utilized a modified version of the Delone and McLean’s information system success model and a content analysis to approach, analyse and discuss the collected data.The findings of this analysis revealed that pre-surgical medical personnel perceived an information system where the technology used to support it, was less significant than the information system’s ability to provide patients with equal access to pre-surgery information. The analysis also revealed that the information system must be capable of presenting information as both text and narrated video, as well as in a language chosen by the patient. Lastly, the perceived effect of the information systems implementation and usage was a substantial reduction in the number of surgeries that were cancelled.
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Yahya, Azli. "Digital control of an electro discharge machining (EDM) system." Thesis, Loughborough University, 2005. https://dspace.lboro.ac.uk/2134/13655.
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This thesis presents a model of the complete Electro Discharge Machining (EDM) system and the design and implementation of a digital controller for the servomotor control and the gap voltage and current pulse power generator. A Matlab/Simulink simulation is used to investigate the EDM system model behaviour and based on the simulation results, a compensated EDM control system is designed. Simulation studies were also earned out to predict the material removal rate of a steel workpiece in mm3/min . The control software of the EDM control process and servo system control was performed mainly in software with minimal hardware implementation. The control hardware consists of an eZdsp, userinterface device and analogue signal processing and interfacing circuit. The eZdsp communicates with the user-interface device by sending the information/instruction to the LCD screen while the user-interface device uses push button switches to communicate with the eZdsp. It is shown that one DSP microcontroller can be used to provide the control functions for the EDM system. The experimental studies of the Electro Discharge Machining process using a copper electrode, a graphite electrode and steel workpiece materials are presented in tabular and graphical forms. The analysis of the experimental results show that the material removal rate is influenced by the process parameters such as the gap current Igap• gap voltage V arc. pulse on-time Ion, and sparking frequency F, as well as the material properties of the electrode and the workpiece. Comparison studies between simulation and experimental results show reasonable agreement. Further improvement was made to the EDM process model based on the comparison studies. As a result, the predicted material removal rate using the improved EDM process model shows better agreement with experimental results.
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Phiri, Jackson. "A digital identity management system." Thesis, UWC, 2007. http://hdl.handle.net/11394/2871.
Full textAbstract:
>Magister Scientiae - MSc<br>The recent years have seen an increase in the number of users accessing online services using communication devices such as computers, mobile phones and cards based credentials such as credit cards. This has prompted most governments and business organizations to change the way they do business and manage their identity information. The coming of the online services has however made most Internet users vulnerable to identity fraud and theft. This has resulted in a subsequent increase in the number of
reported cases of identity theft and fraud, which is on the increase and costing the global industry excessive amounts. Today with more powerful and effective technologies such as artificial intelligence, wireless communication, mobile storage devices and biometrics, it should be possible to come up with a more effective multi-modal authentication system to help reduce the
cases of identity fraud and theft. A multi-modal digital identity management system is proposed as a solution for managing digital identity information in an effort to reduce the cases of identity fraud and theft seen on most online services today. The proposed system thus uses technologies such as artificial intelligence and biometrics on the current unsecured networks to maintain the security and privacy of users and service providers in a transparent, reliable
and efficient way. In order to be authenticated in the proposed multi-modal authentication system, a user is required to submit more than one credential attribute. An artificial intelligent technology is used to implement a technique of information fusion to combine the user’s credential attributes for optimum recognition. The information fusion engine is then used to implement the required multi-modal authentication system.
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Wagner, Thomas William Jr. "Digital autoland system for unmanned aerial vehicles." Texas A&M University, 2003. http://hdl.handle.net/1969.1/5960.
Full textAbstract:
Autoland controllers are prevalent for both large and small/micro unmanned aerial vehicles,
but very few are available for medium sized unmanned aerial vehicles. These
vehicles tend to have limited sensors and instrumentation, yet must possess good
performance in the presence of modeling uncertainties, and exogenous inputs such
as turbulence. Quantitative Feedback Theory is an attractive control methodology
for this application, since it provides good performance and robustness for systems
with structured model uncertainties. It has been successfully applied to many aircraft
problems, but not to automatic landing, and only inner-loop synthesis has been
presented in the literature. This paper describes the synthesis and development of an
automatic landing controller for medium size unmanned aerial vehicles, using discrete
Quantitative Feedback Theory. Controllers for the localizer, glideslope tracker, and
automatic flare are developed, with a focus on the outer-loops synthesis. Linear, non
real-time six degree-of-freedom Monte Carlo simulation is used to compare the Quantitative
Feedback Theory controller to a baseline Proportional-Integral controller in
several still air and turbulent landing scenarios. The Quantitative Feedback Theory
controller provides performance similar to the Proportional-Integral controller in still
and in turbulent air. Both controllers show similar robustness to turbulence, but the
Quantitative Feedback Theory controller provides significantly better robustness to
model uncertainties in turbulent air as well as to sensor characteristics in turbulence.
Based on the results of the paper, the QFT controller is a promising candidate for an autoland controller.
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Liu, X. D. "A NUMERICAL CONTROL AND INFORMATION GATHERING TRANSMISSION SYSTEM." International Foundation for Telemetering, 1991. http://hdl.handle.net/10150/613186.
Full textAbstract:
International Telemetering Conference Proceedings / November 04-07, 1991 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>This paper describes a numerical control and information gathering transmission system. The system is designed around an Intel MSC51 single chip microcomputer. The system has proven to be simple and dependable in a user environment. The system is described first, followed by descriptions of the hardware, the memory assignment, and the software strategy.
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Bananga, L. A. "Information technology of autonomous drone control system design." Master's thesis, Sumy State University, 2021. https://essuir.sumdu.edu.ua/handle/123456789/86926.
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Mabe, Nuala Anne. "Information system design for PCB registration process control." Diss., Online access via UMI:, 2007.
Find full textAbstract:
Thesis (M.S.)--State University of New York at Binghamton, Thomas J. Watson School of Engineering and Applied Science, Department of Systems Science and Industrial Engineering, 2007.<br>Includes bibliographical references.
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McArdle, Neil. "Digital optical information processors : system optimisation and dynamic optical interconnections." Thesis, Heriot-Watt University, 1995. http://hdl.handle.net/10399/1321.
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Ollila, M. (Matti). "Creating architecture for a digital information system leveraging virtual environments." Master's thesis, University of Oulu, 2019. http://jultika.oulu.fi/Record/nbnfioulu-201904051429.
Full textAbstract:
Abstract. The topic of the thesis was the creation of a proof of concept digital information system, which utilizes virtual environments. The focus was finding a working design, which can then be expanded upon. The research was conducted using design science research, by creating the information system as the artifact. The research was conducted for Nokia Networks in Oulu, Finland; in this document referred to as “the target organization”.
An information system is a collection of distributed computing components, which come together to create value for an organization. Information system architecture is generally derived from enterprise architecture, and consists of a data-, technical- and application architectures. Data architecture outlines the data that the system uses, and the policies related to its usage, manipulation and storage. Technical architecture relates to various technological areas, such as networking and protocols, as well as any environmental factors. The application architecture consists of deconstructing the applications that are used in the operations of the information system.
Virtual reality is an experience, where the concepts of presence, autonomy and interaction come together to create an immersive alternative to a regular display-based computer environment. The most typical form of virtual reality consists of a headmounted device, controllers and movement-tracking base stations. The user’s head- and body movement can be tracked, which changes their position in the virtual environment.
The proof-of-concept information system architecture used a multi-server -based solution, where one central physical server hosted multiple virtual servers. The system consisted of a website, which was the knowledge-center and where a client software could be downloaded. The client software was the authorization portal, which determined the virtual environments that were available to the user. The virtual reality application included functionalities, which enable co-operative, virtualized use of various Nokia products, in immersive environments. The system was tested in working situations, such as during exhibitions with customers.
The proof-of-concept system fulfilled many of the functional requirements set for it, allowing for co-operation in the virtual reality. Additionally, a rudimentary model for access control was available in the designed system. The shortcomings of the system were related to areas such as security and scaling, which can be further developed by introducing a cloud-hosted environment to the architecture.
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Yang, Sun. "Solar Energy Control System Design." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-141489.
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This thesis covers design, simulation and implementation of a solar energy control system for an on grid energy storage device. The design covers several control methods such as energy balance control, operating mode switching and data exchange. A genetic algorithm was designed to optimize the control system parameters design, and the algorithm's simulation and real time operating system implementation showed comparable results. The control system was implemented to connect a power supply to the grid. The power supply simulated a solar panel and connected to an electrical grid via Energy Hub equipment, and the energy transfer characteristics of designed control system were tested. The results showed that the selected algorithm matches the target performance criteria.
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Zhou, F. B. "Transputer-based digital control of an active magnetic bearing system." Thesis, University of Salford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360386.
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KUHNER, GUILHERME SESTO. "DIGITAL CONTROL OF A PNEUMATIC POSITIONING SYSTEM FOR BIOMAGNET MEASUREMENTS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1996. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=9376@1.
Full textAbstract:
Este trabalho apresenta uma solução para o problema de
posicionamento automático preciso de um corpo em um plano
horizontal, atendendo à restrição de não gerar campo
magnético significativo junto ao objeto a ser posicionado.
A motivação do trabalho reside na necessidade, por parte
do Laboratório de Supercondutividade Aplicada e Magnetismo
(LSAM) do Departamento de Física, de um posicionador para
experimentação em magnetocardiografia.
Inicialmente são discutidas as tecnologias de
automação aplicáveis ao problema, justificando-se a opção
por um sistema pneumático de atuação. O sistema posicionar
montado é então descrito em profundidade, abordando-se os
aspectos relacionados à geometria do problema em questão,
materiais, montagens mecânicas e o sistema de controle
digital.
A seguir é apresentada uma abordagem matemática
para o problema de controle de posição em malha fechada,
visando à definição de uma lei de controle aplicável ao
caso em estudo. Alguns resultados analíticos são obtidos
para controle de sistema caracterizados por atrito
Coulombiano, ao mesmo tempo em que se desenvolve um modelo
para simulação numérica da dinâmica de movimento do
posicionador. Com base nestas duas ferramentas, é
apresentada uma discussão sobre a aplicabilidade dos
controladores da família PID ao caso específico
considerado. Por fim, resultados reais obtidos com a lei
de controle proposta são comparadores aos resultados
simulados, mostrando-se a validade e a utilidade do modelo
teórico.<br>This thesis presents a solution or the problem of
automatic precise positioning of na object in the
horizontal plane, not generating any significative
magnetic field in the region close to the object to be
positioned. The study presented was developed as part of
an effort to fulfill a necessity for a positioning system
for magnetocardiography experimentation in the Magnetism
and Applied Supercondutivity Laboratory of the Departament
of Physics of this University.
A discussion over applicable automation option is
presents, along with a justification for a choice of a
pneumatic actuating system. The whole precise positioning
assembly is described in detail, including subjects such
as movement geometry, material, mechanical structures and
the digital control system.
A mathematical study of the closed of the closed
loop position control problem is then developed, aiming to
define a control algorithm applicable to the problem.
Algebraic analysis is used to describe the influence of
Coulomb friction over the equations of motion of a
proportional position control system, while a model for
simulations experiments of the assembly´s positioning
dynamics is developed. These tools are used as the basis
for a discussion over the applicability of the PID
controlers in the case in study. Moreover, the behavior of
the proposed algorithm is recorded and compared to the
results of the simulations, showing the correctness and
the utility of the theoretical analysis.
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Gittens, Simon Nevis. "Microprocessor-based digital flight control system design for an R.P.V." Thesis, University of Bath, 1985. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304272.
Full textAbstract:
The development of a microprocessor based digital flight control system for a particular R.P.V. is described. The tasks required of this system are defined, and thereafter, the hardware circuits and the software structure necessary to implement a prototype are presented. The autopilot control laws are inferred from z-plane root loci, and then confirmed using digital simulations of the de-coupled roll and pitch attitude loops. The problems of the finite wordlength implementation of the control laws are discussed, and then both hybrid simulation and actual flight results are used to prove the performance of the prototype. To exploit the adaptive capabilities of a software based system, a sliding mode variable structure control law is developed for the roll attitude loop. Digital simulations are used to show that significant improvements in sensitivity reduction can be achieved under some conditions. These improvements are lost if a realistic servo-actuator model is employed. Another objective, namely the reduction of the disturbance error induced by trim imbalance, is maintained provided a reduced order switching function is used.
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Berglund, Aseel. "Augmenting the Remote Control : Studies in Complex Information Navigation for Digital TV." Doctoral thesis, Linköping : Univ, 2004. http://www.ep.liu.se/diss/science_technology/08/72/index.html.
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Thompson, Richard. "Neuro-fuzzy predictive control of an information-poor system." Thesis, University of Oxford, 2002. http://ora.ox.ac.uk/objects/uuid:e463774c-a1c6-439e-a7e6-3cbb7aec68e3.
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While modern engineering systems have become increasingly integrated and complex over the years, interest in the application of control techniques which specifically attempt to formulate and solve the control problem in its inherently uncertain environment has been moderate, at best. More specifically, although many control schemes targeted at Heating, Ventilating and Air-Conditioning (HVAC) systems have been reported in the literature, most seem to rely on conventional techniques which assume that a detailed, precise model of the HVAC plant exists, and that the control objectives of the controller are clearly defined. Experience with HVAC systems shows that these assumptions are not always justifiable, and that, in practice, these systems are usually characterized by a lack of detailed design data and a lack of a robust understanding of the processes involved. Motivated by the need to more efficiently control complex, uncertain systems, this thesis focuses on the development and evaluation of a new neuro-fuzzy model-based predictive control scheme, where certain variables used in the optimization remain in the fuzzy domain. The method requires no training data from the actual plant under consideration, since detailed knowledge of the plant is unavailable. Results of the application of the control scheme to the control of thermal comfort in a simulated zone and to the control of the supply air temperature of an air-handling unit in the laboratory are presented. It is concluded that precious resources (as measured by actuator activity, for example) need not be wasted when controlling these systems. In addition, it is also shown that a very precise (and sometimes not necessarily accurate) control value computed at each sample is unnecessary. Rather, by defining the system and its environment in the fuzzy domain, the fuzzy decision algorithms developed here may be employed to get an "acceptable" control performance.
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Abbassi, Hadj Ahmed. "Control of an electromagnetic suspension system using TMS 32020 digital signal processor." Thesis, University of Reading, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303466.
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Cumplido, Parra Rene Armando. "On the design and implementation of a control system processor." Thesis, Loughborough University, 2001. https://dspace.lboro.ac.uk/2134/34269.
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In general digital control algorithms are multi-input multi-output (MIMO) recursive digital filters, but there are particular numerical requirements in control system processing for which standard processor devices are not well suited, in particular arising in systems with high sample rates. There is therefore a clear need to understand the numerical requirements properly, to identity optimised forms for implementing control laws, and to translate these into efficient processor architectures. By taking a considered view of the numerical and calculation requirements of control algorithms, it is possible to consider special purpose processors that provide well-targeted support of control laws. This thesis describes a compact, high-speed, special-purpose processor which offers a low-cost solution to implementing linear time invariant controllers.
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Silva, Carla Sofia Oliveira Pina Fernandes. "A questão da preservação digital numa perspectiva orientada segundo o Open Archival Information System." Master's thesis, Universidade de Évora, 2007. http://hdl.handle.net/10174/17880.
Full textAbstract:
O aumento da produção da informação digital nas últimas décadas, a instabilidade dos meios para transportar e armazenar estes dados, o constante risco da obsolescência tecnológica, conduziram à necessidade de desenvolver iniciativas que tratem do problema da preservação digital de objetos nado-digitais. Interrompido o suporte tecnológico, interrompem-se os circuitos documentais, o acesso aos dados, e a informação desaparece. Atualmente, o OAIS* - um sistema aberto de informação de arquivo, tal como o nome denuncia - é a alternativa mais viável para uma normalização e para o desenvolvimento de um sistema para a preservação e manutenção de acessos à informação nado-digital a longo prazo. Os objetivos? Ampliar a consciência e a compreensão de conceitos relevantes para a preservação dos objetos digitais, avaliar o estado atual da preservação digital em arquivos municipais e distritais Portugueses. Urge propor metodologias que permitam estabelecer circuitos que assegurem o acesso no futuro. /Abstract: The increase of the digital information production in the last decades, the storage and access instability, the technological risks have conducted to the development of programmes and strategies focused in the born-digital objects' presentation issue. When technological support ends, documental circuits are interrupted, access is broken and data disappear. At the moment, the OAIS - an Open Archival Information System -, is the most suitable choice for a standardization, to develop presentation which allows a long term born-digital information access maintenance system. Its goal? To enlarge knowledge, understand and develop concepts for digital objects presentation and develop schemes circuits that ensure a long- term access, analise digital preservation measures taken by Portuguese local and district's archives. lt's urgent to develop strategies wich allow to establish circuits to ensure the access in the future.
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Van, Papendorp J. F. "Digital control of line-interactive UPS." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6537.
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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2011.<br>ENGLISH ABSTRACT: The digital control of UPS systems has been difficult in the past due to a lack of DSP technology. It was for
this reason not possible to establishing the necessary control to regulate the voltages and currents of the UPS
systems. Recent advances in DSP technology have however provided the means of establishing central
control of the UPS system as well as incorporating more complex closed-loop control algorithms by utilising
a single floating-point DSP.
Closed-loop control strategies are investigated and the central control of a line-interactive UPS is established
in this study. Both the status of the physical system as well as various system parameters are controlled. The
system both regulates and charges the storage batteries when the main utility supply is maintained. In the
event that the utility fails, the converter instantaneously changes power flow towards the load with the aim of
maintaining an uninterrupted voltage supply.
Several closed-loop deadbeat based control strategies are investigated for the regulation of the inductor
current. A solution for the regulation of the DC-link is also developed and implemented. Furthermore, an
intensive study is done on the regulation of the voltage supplied to the load in the event that the utility supply
fails. The investigation is initially approached by considering classical control theory. Although these control
strategies provided sufficient results, a predictive strategy that is based on the physical conditions of the
switching converter is finally investigated to establish closed loop control of the output voltage. This resulted
in a high-bandwidth voltage controller capable of maintaining control under a wide-array of load conditions.<br>AFRIKAANSE OPSOMMING: Die digitale beheer van UPS stelsels was moeilik in the verlede as gevolg van 'n gebrek aan DSP tegnologie.
Dit was vir hierdie rede nie moontlik om beheer te kon bewerkstelling ten einde die spannings and strome in
the UPS stelsels te kon reguleer nie. Onlangse vordering in DSP tegnologie het egter dit moontlik gemaak
om sentrale beheer van die UPS stelsel te bewerkstellig sowel as om meer komplekse geslote lus beheer
algoritmes te inkorporeer met behulp van 'n enkele DSP.
Geslote lus beheer strategiëe word ondersoek en die sentrale beheer van die line-interaktiewe UPS word
bewerkstellig in hierdie studie. Beide die huidige toestand van die fisiese stelsel sowel as die verskeie
parameters word beheer. Die stelsel beide laai en reguleer die batterye terwyl die hooftoevoer onderhou
word. In die geval dat die hooftoevoer faal, word die omsetter se rigting van drywingsvloei verander om die
las te voorsien van 'n ononderbroke spannings toevoer.
Verskeie geslote-lus “deadbeat” beheer strategiëe word ondersoek vir die regulasie van die induktor stroom.
'n Oplossing vir die regulasie van die GS-koppervlak word ook ontwikkel en geïmplementeer. Verder word
'n intensiewe studie gedoen op regulasie van die spanning wat aan die las gevoer word in die geval dat die
hooftoevoer faal. Hierdie ondersoek word aanvanklik benader deur klassieke beheer teorie te bestudeer.
Alhoewel hierdie beheer strategiëe voldoene resultate gebied het, was 'n voorspel beheerstrategie gebaseer
op die fisiese toestand van die omsetter finaal ondersoek. Die resultaat is 'n hoë-bandwydte spannings
beheerder wat daartoe instaat is om beheer te handhaaf onder 'n verskeidenheid van lastoestande.
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Ström, Marcus. "System Design of RF Receiver and Digital Implementation of Control Logic." Thesis, Linköping University, Department of Science and Technology, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1848.
Full textAbstract:
<p>This report is the outcome of a thesis work done at Linköpings University, campus Norrköping. The thesis work was part of the development of a RF transceiver chip for implantable medical applications. The development was done in cooperation with Zarlink Semiconductor AB, located in Järfälla, Stockholm.</p><p>The transceiver is divided into three main blocks, which are the wakeup block, the MAC block and the RF block. The wakeup block is always operating and is awaiting a wakeup request in the 2,45GHz ISM-band. The RF-block is operating in the 400MHz ISM-band and is powered up after wakeup The MAC is the controller of the whole chip. All three blocks in the transceiver structure should be integrated on the same chip, using TSMC 0,18µm process design kit for CMOS (Mixed Signal /RF).</p><p>The purpose of the thesis work was to develop the wakeup circuit for the transceiver. The main purpose was to develop the digital control logic in the circuitry, using RTL-coding (mainly VHDL) but the thesis work also included a system analysis of the whole wakeup block, including the front-end, for getting a better overview and understanding of the project.</p><p>A complete data packet or protocol for the wakeup message on 2,45GHz, is defined in the report and is one of the results of the project. The packet was developed continuously during progress in the project. Once the data packet was defined the incoming RF stage could be investigated. The final proposal to a complete system design for the wakeup block in the RF transceiver is also one of the outcomes of the project. The front-end consists mainly of a LNA, a simple detector and a special decoder. Since the total power consumption on the wakeup block was set to 200nA, this had to be taken under consideration continuously. There was an intention not to have an internal clock signal or oscillator available in the digital part (for keeping the power consumption down). The solution to this was a self-clocking method used on the incoming RF signal. A special decoder distinguishes the incoming RF signal concerning the burst lengths in time. The decoder consists of a RC net that is uploaded and then has an output of 1, if the burst length is long enough and vice versa.</p><p>When it was decided to use a LNA in the front-end, it was found that it could not be active continuously, because of the requirements on low power consumption. The solution to this was to use a strobe signal for the complete front-end, which activates it. This strobe signal was extracted in the digital logic. The strobe signal has a specific duty cycle, depending on the time factors in the detector and in the decoder in the front-end. The total strobing time is in the implemented solution 250µs every 0,5s.</p><p>The digital implementation of the control logic in the wakeupblock was made in VHDL (source code) and Verilog (testbenches). The source code was synthesized against the component library for the process 0,18µm from TSMC, which is a mixed/signal and RF process. The netlist from the synthesizing was stored as a Verilog file and simulated together with the testbenches using the simulator Verilog-XL. The results from the simulations were examined and reviewed in the program Simvison from Cadence. The result was then verified during a pre-layout review together with colleagues at Zarlink Semiconductor AB. During the implementation phase a Design report was written continuously and then used for the pre-layout review. Extracts (source code and testbench) from this document can be found as appendixes to the report.</p>
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Ashe, John Douglas, and Randy Lee Wight. "Petite Amateur Naval Satellite Spacecraft Digital Control System: a hardware design." Thesis, Monterey, California: Naval Postgraduate School, 1993. http://hdl.handle.net/10945/24213.
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Yang, Ming-Che, and 楊明哲. "Integrated Planning and Control on Operations of Digital Television Program: An Information System Perspective." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/45661219415617984007.
Full textAbstract:
碩士<br>世新大學<br>傳播管理學研究所(含碩專班)<br>93<br>In couple with the progresses of information technology, TV industry digitized its process in two stages, business process digitization and manufacturing operations digitization. The digitization, in consequence, changed traditional operations system and as well as organizations structure. To face these significant effects, traditional management method should be adjusted accordingly. This study focused on TV industry, from the perspectives of manufacturing operations, organization, management, and information system, to probe the influences of digitization on operation and management level in depth. In this paper, based on information technology, a planning and control model is proposed for media manufacturing. The model is the conjunction of the application of information technical and the characteristics of digitized operations. Besides, the model is also the integration of the internal process system and manufacturing operations system, where both managerial and strategic level is covered. Furthermore, the model provides various kind of needed information in real time manner, increase effectively capabilities of managers, in respect of planning and control.
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Xiao, Yanni. "Topographic characterization for DEM error modelling." Thesis, 1996. http://hdl.handle.net/2429/6235.
Full textAbstract:
Digital Elevation Models have been in use for more than three decades and have become a
major component of geographic information processing. The intensive use of DEMs has
given rise to many accuracy investigations. The accuracy estimate is usually given in a form
of a global measure such as root-mean-square error (RMSE), mostly from a producer's point
of view. Seldom are the errors described in terms of their spatial distribution or how the
resolution of the DEM interacts with the variability of terrain. There is a wide range of
topographic variation present in different terrain surfaces. Thus, in defining the accuracy of
a DEM, one needs ultimately to know the global and local characteristics of the terrain and
how the resolution interacts with them.
In this thesis, DEMs of various resolutions (i.e., 10 arc-minutes, 5 arc-minutes, 2 km, 1 km,
and 50 m) in the study area (Prince George, British Columbia) were compared to each other
and their mismatches were examined. Based on the preliminary test results, some
observations were made regarding the relations among the spatial distribution of DEM errors,
DEM resolution and the roughness of terrain. A hypothesis was proposed that knowledge of
the landscape characteristics might provide some insights into the nature of the inherent error
(or uncertainty) in a DEM. To test this statistically, the global characteristics of the study
area surfaces were first examined by measures such as grain and those derived from spectral
analysis, nested analysis of variance and fractal analysis of DEMs. Some important scale
breaks were identified for each surface and this information on the surface global
characteristics was then used to guide the selection of the moving window sizes for the
extraction of the local roughness measures. The spatial variation and complexity of various
study area surfaces was characterized by means of seven local geomorphometric parameters.
The local measures were extracted from DEMs with different resolutions and using different
moving window sizes. Then the multivariate cluster analysis was used for automated terrain
classification in which relatively homogeneous terrain types at different scale levels were
identified. Several different variable groups were used in the cluster analysis and the
different classification results were compared to each other and interpreted in relation to each
roughness measure. Finally, the correlations between the DEM errors and each of the local
roughness measures were examined and the variation of DEM errors within various terrain
clusters resulting from multivariate classifications were statistically evaluated. The
effectiveness of using different moving window sizes for the extraction of the local measures
and the appropriateness of different variable groups for terrain classification were also
evaluated.
The major conclusion of this study is that knowledge of topographic characteristics does
provide some insights into the nature of the inherent error (or uncertainty) in a DEM
and can be useful for DEM error modelling. The measures of topographic complexity are
related to the observed patterns of discrepancy between DEMs of differing resolution, but
there are variations from case to case. Several patterns can be identified in terms of relation
between DEM errors and the roughness of terrain. First of all, the DEM errors (or elevation
differences) do show certain consistent correlations with each of the various local roughness
variables. With most variables, the general pattern is that the higher the roughness measure,
the more points with higher absolute elevation differences (i.e., horn-shaped scatter of points
indicating heteroscedasticity). Further statistical test results indicate that various DEM errors
in the study area do show significant variation between different clusters resulting from
terrain classifications based on different variable groups and window sizes. Cluster analysis
was considered successful in grouping the areas according to their overall roughness and
useful in DEM error modelling. In general, the rougher the cluster, the larger the DEM error
(measured with either the standard deviation of the elevation differences or the mean of the
absolute elevation differences in each cluster). However, there is still some of the total
variation of various DEM errors that could not be accounted for by the cluster structure
derived from multivariate classification. This could be attributed to the random errors
inherent in any of the DEMs and the errors introduced in the interpolation process.
Another conclusion is that the multivariate approach to the classification of topographic
surfaces for DEM error modelling is not necessarily more successful than using only a single
roughness measure in characterizing the overall roughness of terrain. When comparing the
DEM error modelling results for surfaces with different global characteristics, the size of the
moving window used in geomorphometric parameter abstraction also has certain impact on
the modelling results. It shows that some understanding of the global characteristics of the
surface is useful in the selection of appropriate/optimal window sizes for the extraction of
local measures for DEM error modelling. Finally, directions for further research are
suggested.
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Wang, Pengcheng. "Design and Implementation of Digital Information Security for Physical Documents." 2015. https://scholarworks.umass.edu/masters_theses_2/214.
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The objective of this thesis is to improve the security for physical paper documents. Providing information security has been difficult in environments that rely on physical paper documents to implement business processes. Our work presents the design of a digital information security system for paper documents, called "CryptoPaper", that uses 2-dimensional codes to represent data and its security properties on paper. A special scanner system is designed for "CryptoPaper" which uses image recognition techniques and cloud-based access control to display plaintext of encrypted and encoded data to authorized users.
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Britton, Matthew Scott. "Stochastic task scheduling in time-critical information delivery systems / Matthew Britton." Thesis, 2003. http://hdl.handle.net/2440/21899.
Full textAbstract:
"January 2003"<br>Includes bibliographical references (leaves 120-129)<br>x, 129 leaves : ill. ; 30 cm.<br>Presents performance analyses of dynamic, stochastic task scheduling policies for a real- time-communications system where tasks lose value as they are delayed in the system.<br>Thesis (Ph.D.)--University of Adelaide, Dept. of Electrical and Electronic Engineering, 2003
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"Error control coded data transmision over FM supplementary signal transmission radio channels." Thesis, 2015. http://hdl.handle.net/10210/14748.
Full textAbstract:
M.Ing. (Electrical and Electronic Engineering)<br>With all the talk about the Information Highway and its construction, there is also a channel which is highly underestimated and thus almost ignored. On normal FM radio transmissions extra bandwidth exists, suitable for the transmission of audio and data. In this thesis the effects of interference on data transmission over the Supplementary Signal Transmission (SST) channel are analysed. The channel is characterized in terms of the Bit Error Rate (BER) versus field strength and distance from a transmitter ...