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Tesi sul tema "System design"
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1
Altas, Daghan S. "System level design with systemC". Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=30781.
Testo completoAbstract (sommario):
In this thesis, we provide a system level design methodology aimed for the design of embedded systems. Our methodology is geared towards the concurrent design of hardware components and software agents. Our choice of tool/language pair is CoWare N2C design tool and SystemC specification language. Our design flow is completed with a high performance hardware synthesis methodology relying behavioral synthesis. A case study, the design of an ATM switch, is carried out to illustrate the proposed ideas.
2
Erturk, Alper. "An expert system for reward systems design". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2000. http://handle.dtic.mil/100.2/ADA383532.
Testo completoAbstract (sommario):
Thesis (M.S. in Information Technology Management and M.S. in Systems Management) Naval Postgraduate School, Sept. 2000.Thesis advisor(s): Jansen, Erik; Nissen, Mark E. Includes bibliographical references (p. 93-94). Also available online.
3
Tosun, Suleyman. "Reliability-centric system design for embedded systems". Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2005. http://wwwlib.umi.com/cr/syr/main.
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Rodhouse, Kathryn, Steven Ziegler e Ryan Huttsell. "A Robotic Platform for Student System Design". International Foundation for Telemetering, 2010. http://hdl.handle.net/10150/605979.
Testo completoAbstract (sommario):
ITC/USA 2010 Conference Proceedings / The Forty-Sixth Annual International Telemetering Conference and Technical Exhibition / October 25-28, 2010 / Town and Country Resort & Convention Center, San Diego, CaliforniaThe goal of the project described in this paper, is to develop a platform for undergraduate engineering students to use in system analysis and design courses. We chose to develop an inexpensive robotic platform. The robot is intended to be autonomous, under the control of an on-board microcontroller. In the first revision of the hardware, a three wheeled design will be used, with the intention of being used indoors, on smooth surfaces. Students in their first year of college education will purchase the components, and assemble the robot. After analyzing the baseline design, they will be encouraged to incorporate new sensors and actuators in the subsequent laboratory courses.
5
Risberg, Robert. "Camera System Design". Thesis, Linköping University, Department of Electrical Engineering, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2028.
Testo completoAbstract (sommario):
Devices have become increasingly more interconnected to their surroundings over the last few years. The introduction of Bluetooth is likely to further accelerate this trend. With Bluetooth's bandwidth and expected low price, many devices will likely be fitted with Bluetooth chips and thus enable more devices to exchange data.
This master thesis aims at connecting a Personal Digital Assistant to an ARM Thumb microcontroller over Bluetooth. To the ARM Thumb shall an image capturing device be interfaced and the captured images shall be sent over Bluetooth to the Personal Digital Assistant which shall display them.
6
Brown, Timothy McDonnell. "HYDROELECTRIC SYSTEM DESIGN". DigitalCommons@CalPoly, 2010. https://digitalcommons.calpoly.edu/theses/408.
Testo completoAbstract (sommario):
Hydroelectric power generation is not a viable option as a prime source of electrical energy for the Pico Blanco Boy Scout Camp, as determined by this thesis. The hydroelectric power system can only provide a maximum power capacity of 17kW as limited by the available mechanical energy of the water source. This power capacity is inadequate to reliably supply power to the electrical loads at the camp during peak demand periods. The purpose of this thesis was to study the feasibility of supplying the Boy Scout Camp with a renewable source of electrical energy through an exploration of various hydroelectric system design concepts.
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Horan, Stephen. "Using Labview to Design a Payload Control System". International Foundation for Telemetering, 2008. http://hdl.handle.net/10150/606179.
Testo completoAbstract (sommario):
ITC/USA 2008 Conference Proceedings / The Forty-Fourth Annual International Telemetering Conference and Technical Exhibition / October 27-30, 2008 / Town and Country Resort & Convention Center, San Diego, CaliforniaAs part of a project to develop small satellites, we have developed a combined ground station and flight computer control software package using LabVIEW. These computer systems are used to acquire data from sensors, control communications links, provide automatic data acquisition capabilities, and provide a user interface. In this paper, we will look at the state machines that describe both sets of software, the challenges for the flight computer development given the PC/104 format, and show how the final product was deployed.
8
Parrish, James. "SENSEMAKING IN INFORMATION SYSTEMS: TOWARD A SENSEMAKING INQUIRING SYSTEM". Doctoral diss., University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3502.
Testo completoAbstract (sommario):
Complexity and uncertainty have long been problems for organizations of all types. Organizational members do not do a very good job of dealing with the complexity and uncertainty as research shows that when faced with complex situations humans often turn to the same sources of information repeatedly (a practice that will eventually betray them), and/or reduce the amount of scanning that they do (Weick 1995; Boyd and Fulk 1996). Organizations often turn to information systems to help them deal with the complexity, but they often take a techno-centric view of knowledge that does not incorporate the human qualities needed for unstructured decisions (Malhotra 1997; Courtney 2001; Malhotra 2001). Additionally, there are times when the information systems that we are using may hinder the processes of dealing with the complexity (Weick and Meader 1993). Weick's (1995) concept of sensemaking is believed to help us to deal with this complexity. In his work with Meader (1993) he wonders what the effects of a sensemaking support system would have, but he does not have the answer because they state that it has not been asked. This dissertation answers the call of Weick and Meader as well as other scholars that have called for sensemaking and human intuition to be included in our information systems. This is accomplished by viewing sensemaking from an inquiring systems perspective (Churchman 1971) to develop a kernel theory that will be used in the context of design science to develop design requirements and principles for a sensemaking system. These design principles are then used to build an instantiation of the system in the form of SenseMan, a system designed to help a local government agency deal with complexity in the context of software updates. Finally the design is evaluated for its effectiveness in dealing with the complexity of in this context using both quantitative and qualitative methods.Ph.D.
Department of Management Information Systems
Business Administration
Business Administration PhD
9
Gregory, Frank Hutson. "A logical analysis of soft systems modelling : implications for information system design and knowledge based system design". Thesis, University of Warwick, 1993. http://wrap.warwick.ac.uk/2888/.
Testo completoAbstract (sommario):
The thesis undertakes an analysis of the modelling methods used in the Soft Systems Methodology (SSM) developed by Peter Checkland and Brian Wilson. The analysis is undertaken using formal logic and work drawn from modern Anglo-American analytical philosophy especially work in the area of philosophical logic, the theory of meaning, epistemology and the philosophy of science. The ability of SSM models to represent causation is found to be deficient and improved modelling techniques suitable for cause and effect analysis are developed. The notional status of SSM models is explained in terms of Wittgenstein's language game theory. Modal predicate logic is used to solve the problem of mapping notional models on to the real world. The thesis presents a method for extending SSM modelling in to a system for the design of a knowledge based system. This six stage method comprises: systems analysis, using SSM models; language creation, using logico-linguistic models; knowledge elicitation, using empirical models; knowledge representation, using modal predicate logic; codification, using Prolog; and verification using a type of non-monotonic logic. The resulting system is constructed in such a way that built in inductive hypotheses can be falsified, as in Karl Popper's philosophy of science, by particular facts. As the system can learn what is false it has some artificial intelligence capability. A variant of the method can be used for the design of other types of information system such as a relational database.
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Mehendale, Vikram Prabhakar. "System approach to embedded system design". [Tampa, Fla.] : University of South Florida, 2007. http://purl.fcla.edu/usf/dc/et/SFE0002282.
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Siddapureddy, Venu R. 1969. "Evolvable system architecture : design issues of learning systems". Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/92076.
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Winschiers, Heike. "Dialogical system design across cultural boundaries system design out of Africa /". [S.l.] : [s.n.], 2001. http://www.sub.uni-hamburg.de/disse/482/Disse.pdf.
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Öberg, Kim, e Johanna Simonsson. "System design choices in smartautonomous networked irrigation systems". Thesis, KTH, Maskinkonstruktion (Inst.), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-157146.
Testo completoAbstract (sommario):
Wireless Sensor Networks are often deployed in great numbers spanning large, sometimes hard to reach and hostile, areas with the aim of monitoring environmental conditions through the use of different sensors. Due to decreasing costs of ownership (e.g. non-proprietary protocols), recent advances in processor, radio, and memory technologies and the engineering of increasingly smaller sensing devices, the availability and area of application for wireless sensor networks have steadily been increasing. Sigma Technology Development Stockholm AB raised the question as to whether a wireless sensor network, running an open-source operating system and communicating over IPv6, could be used in the field of smart autonomous irrigation? The company also required a proof-of-concept system for demonstration purposes and to identify if the design choices made were suitable for an actual implementation. There are numerous of design decisions that have to be made when constructing an irrigation system: the back-end set-up, which irrigation algorithms to use, what hardware to choose and how to communicate? This thesis therefore focuses on the overall system design of a wireless sensor network in the field of irrigation and highlights the trade-offs being made and their pros and cons. Two improvements related to the existing technology and the proof-of-concept system are presented in this thesis. Firstly, the recommendation to use clustered self-healing routing despite claimed power consumption issues. Secondly, a new technique to minimize power consumption, by dynamically changing the sleep interval on the sensor nodes with the help of weather data. Furthermore, the proof-of-concept system is constructed and analysed to assess whether the system design choices made are valid for a real-life deployment.Trådlösa sensor nätverk används för att övervaka lokala miljöförändringar med hjälp av olika sorters sensorer. På grund av nedåtgående driftkostnader (ökad tillgänglighet av open-source mjukvara) och framsteg inom processor-, radio-, och datorminnesteknolgi har både tillgängligheten och användningsområdena för trådlösa sensornätverk stadigt ökat. Sigma Technology Development AB ställde frågan huruvida ett trådlöst sensornätverk, som använder sig av ett open-source operativsystem och kommunicerar över IPv6, kunde användas inom smart konstbevattning? Företaget ville även att ett proof-ofconcept system utvecklades för demonstration samt för att kunna avgöra om de designval som gjorts är lämpliga att använda i en verklig implementation. Det finns en mängd designval som måste göras när man konstruerar ett bevattningsystem: back-end lösningen, vilka bevattningsalogritmer som ska användas, vilken hårdvara som ska användas samt hur kommunikationen mellan noderna ska upprättas? Det här examensarbetet fokuserar därför på den övergripande systemdesigen av ett trådlöst sensornätverk inom konstbevattning, utvärderar och avgör vilka kompromisser som måste göras samt för- och nackdelarna med dessa val. Examensarbetet presenterar vidare två förbättringar på det utvecklade konceptsystemet som inte heller finns på marknanden. Först rekommenderas användandet av robusta självläkande routing protokoll trots påstådda energiförbrukningsproblem. Sedan föreslås även en teknik som minimerar energiåtgången genom att dynamiskt ändra hur länge sensornoden befinner sig i ’sleep mode’, detta med hjälp av insamlad väderdata. Slutligen så konstrueras och analyseras proof-of-concept systemet för att utvärdera om dessa designval är lämpliga för en implementering i det verkliga livet.
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Astapenko, D. "Automated system design optimisation". Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/6863.
Testo completoAbstract (sommario):
The focus of this thesis is to develop a generic approach for solving reliability design optimisation problems which could be applicable to a diverse range of real engineering systems. The basic problem in optimal reliability design of a system is to explore the means of improving the system reliability within the bounds of available resources. Improving the reliability reduces the likelihood of system failure. The consequences of system failure can vary from minor inconvenience and cost to significant economic loss and personal injury. However any improvements made to the system are subject to the availability of resources, which are very often limited. The objective of the design optimisation problem analysed in this thesis is to minimise system unavailability (or unreliability if an unrepairable system is analysed) through the manipulation and assessment of all possible design alterations available, which are subject to constraints on resources and/or system performance requirements. This thesis describes a genetic algorithm-based technique developed to solve the optimisation problem. Since an explicit mathematical form can not be formulated to evaluate the objective function, the system unavailability (unreliability) is assessed using the fault tree method. Central to the optimisation algorithm are newly developed fault tree modification patterns (FTMPs). They are employed here to construct one fault tree representing all possible designs investigated, from the initial system design specified along with the design choices. This is then altered to represent the individual designs in question during the optimisation process. Failure probabilities for specified design cases are quantified by employing Binary Decision Diagrams (BDDs). A computer programme has been developed to automate the application of the optimisation approach to standard engineering safety systems. Its practicality is demonstrated through the consideration of two systems of increasing complexity; first a High Integrity Protection System (HIPS) followed by a Fire Water Deluge System (FWDS). The technique is then further-developed and applied to solve problems of multi-phased mission systems. Two systems are considered; first an unmanned aerial vehicle (UAV) and secondly a military vessel. The final part of this thesis focuses on continuing the development process by adapting the method to solve design optimisation problems for multiple multi-phased mission systems. Its application is demonstrated by considering an advanced UAV system involving multiple multi-phased flight missions. The applications discussed prove that the technique progressively developed in this thesis enables design optimisation problems to be solved for systems with different levels of complexity. A key contribution of this thesis is the development of a novel generic optimisation technique, embedding newly developed FTMPs, which is capable of optimising the reliability design for potentially any engineering system. Another key and novel contribution of this work is the capability to analyse and provide optimal design solutions for multiple multi-phase mission systems. Keywords: optimisation, system design, multi-phased mission system, reliability, genetic algorithm, fault tree, binary decision diagram
15
Ali, Mohammad. "Production system design methodology with emphasis on sub-system and equipment design". Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/46085.
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Pilewski, Frank Michael. "System design of a discrepancy reporting system". Master's thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-03302010-020515/.
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Harsh, Timothy. "Algorithmic simulation in system design and innovation". Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/70802.
Testo completoAbstract (sommario):
Thesis (S.M. in Engineering and Management)--Massachusetts Institute of Technology, Engineering Systems Division, System Design and Management Program, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 61-63).
This thesis explores the use of genetic programming as a tool in the system design and innovation process. Digital circuits are used as a proxy for complex technological designs. Circuit construction is simulated through a computer algorithm which assembles circuit designs in an attempt to reach specified design goals. Complex designs can be obtained by repeatedly combining simpler components, often called building blocks, which were created earlier in the algorithm's progression. This process is arguably a reflection of the traditional development path of systems engineering and technological innovation. The choice of algorithm used to guide this process is crucial. This thesis considers two general types of algorithms-a blind random search method, and a genetic programming search method-with variations applied to each. The research focused on comparing these algorithms in regard to: 1) the successful creation of multiple complex designs; 2) resources utilized in achieving a design of a given complexity; and 3) the inferred time dependence of technological improvement resulting from the process. Also of interest was whether these algorithms would exhibit exponential rates of improvement of the virtual technologies being created, as is seen in real-world innovation. The starting point was the hypothesis that the genetic programming approach might be superior to the random search method. The results found however that the genetic programming algorithm did not outperform the blind random search algorithm, and in fact failed to produce the desired circuit design goals. This unexpected outcome is believed to result from the structure of the circuit design process, and from certain shortcomings in the genetic programming algorithm used. This work also examines the relationship of issues and considerations (such as cost, complexity, performance, and efficiency) faced in these virtual design realms to managerial strategy and how insights from these experiments might be applied to real-world engineering and design challenges. Algorithmic simulation approaches, including genetic programming, are found to be powerful tools, having demonstrated impressive performance in bounded domains. However, their utility to systems engineering processes remains unproven. Therefore, use of these algorithmic tools and their integration into the human creative process is discussed as a challenge and an area needing further research.
by Timothy Harsh.
S.M.in Engineering and Management
18
Tebbutt, Colin Dean. "Control system design using artificial intelligence". Doctoral thesis, University of Cape Town, 1991. http://hdl.handle.net/11427/14697.
Testo completoAbstract (sommario):
Includes bibliography.Successful multivariable control system design demands knowledge, skill and creativity of the designer. The goal of the research described in this dissertation was to investigate, implement, and evaluate methods by which artificial intelligence techniques, in a broad sense, may be used in a design system to assist the user. An intelligent, interactive, control system design tool has been developed to fulfil this aim. The design tool comprises two main components; an expert system on the upper level, and a powerful CACSD package on the lower level. The expert system has been constructed to assist and guide the designer in using the facilities provided by the underlying CACSD package. Unlike other expert systems, the user is also aided in formulating and refining a comprehensive and achievable design specification, and in dealing with conflicts which may arise within this specification. The assistance is aimed at both novice and experienced designers. The CACSD package includes a synthesis program which attempts to find a controller that satisfies the design specification. The synthesis program is based upon a recent factorization theory approach, where the linear multivariable control system design problem is translated into, and techniques efficiency solved as, a quadratic programming problem, which significantly improve the time and space of this method have been developed, making it practical to solve substantial multivariable design problems using only a microcomputer. The design system has been used by students at the University of Cape Town. Designs produced using the expert system tool are compared against those produced using classical design methods.
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Uddin, Amad. "Development of an integrated interface modelling methodology to support system architecture analysis". Thesis, University of Bradford, 2016. http://hdl.handle.net/10454/15905.
Testo completoAbstract (sommario):
This thesis presents the development and validation of a novel interface modelling methodology integrated with a system architectural analysis framework that emphasises the need to manage the integrity of deriving and allocating requirements across multiple levels of abstraction in a structured manner. The state of the art review in this research shows that there is no shared or complete interface definition model that could integrate diverse interaction viewpoints for defining system requirements with complete information. Furthermore, while existing system modelling approaches define system architecture with functions and their allocation to subsystems to meet system requirements, they do not robustly address the importance of considering well-defined interfaces in an integrated manner at each level of systems hierarchy. This results in decomposition and integration issues across the multiple levels of systems hierarchy. Therefore, this thesis develops and validates following: -Interface Analysis Template as a systematic tool that integrates diverse interaction viewpoints for modelling system interfaces with intensive information for deriving requirements. -Coupling Matrix as an architecture analysis framework that not only allocates functions to subsystems to meet requirements but also promotes consistent consideration of well-defined interfaces at each level of design hierarchy. Insights from the validation of developed approach with engineering case studies within an automotive OEM are discussed, reflecting on the effectiveness, efficiency and usability of the methods.
20
Coley, F. J. S. "Exploring whole system design". Thesis, Cranfield University, 2008. http://dspace.lib.cranfield.ac.uk/handle/1826/3808.
Testo completoAbstract (sommario):
The emergence of increasingly complex problems, combined with growing concerns for the environment, is fuelling the demand for more innovative and sustainable products, services and systems. Whole system design is one approach that aims to integrate social, economic and environmental phenomena into a comprehensive design solution. The approach encourages the development of partnerships between actors from a variety of different backgrounds, disciplines and sectors to develop an innovative, sustainable and optimised solution at a whole system level. However, there is limited research concerning the integrative process that actors are required to follow in order to reach such a solution. The aim of this study was to gain improved knowledge and understanding surrounding the process of whole system design and to identify those factors that influence its success. This was achieved in two phases; firstly a longitudinal case study was undertaken which followed the process of whole system design from beginning to end. 22 design and progress meetings were observed, 18 interviews were carried out and a multitude of relevant documentation was analysed. This resulted in the identification of 10 themes. The second phase of the research aimed to validate initial findings by conducting 5 smaller cases and interviewing 11 individually selected experts. The study ultimately produced 8 confirmed themes, 68 individual findings and 37 factors that enable and inhibit the process of whole system design. As a result of this study, an improved knowledge and understanding surrounding the process of whole system design has been presented. In particular, findings have been provided concerning: the development of partnerships, the pertinence of human and non-human interaction, the requirement of individual characteristics, enhanced understanding of purpose and process, the necessary alignment of individual and organisational motivation, the necessity of sense making activities, the role of a facilitator and the need for integration, each of these within the context of whole system design. The framework of these findings provides a novel contribution to knowledge within the context of whole system design.
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Atanackovic, Djordje. "Intelligent power system design". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ29878.pdf.
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Atanackovic, Djordje. "intelligent power system design". Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=41969.
Testo completoAbstract (sommario):
In this thesis, the concept of an intelligent system for the design and planning of electric power systems is developed. Such a system serves to preserve the vast body of power system design knowledge by identifying, structuring and consolidating it into one easily accessible source. The intelligent system can then be used to support experienced power system planners or for training purposes. The main planning and design activities considered include the design of a complete power system or of specific subsystems such as a substation or a transmission corridor. The principal features and main components of this general intelligent system, called PSIDE, are delineated.A general methodology and a design tool were then devised for modelling and using this kind of knowledge. The object-oriented strategy was found to be the most suitable due its powerful capabilities to naturally represent the structure and behaviour of power systems. Thus, PSIDE is based on object-oriented knowledge models for design tasks such as point-to-point transmission design, insulation coordination as well as protection system and substation design.
In order to validate the proposed concepts as well as the object-oriented paradigm adopted for their realization, a substation design module (SIDE) was fully developed and tested.
23
Kim, J.-K. "Cooling water system design". Thesis, University of Manchester, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.504687.
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Gunaratnam, Mohan S. "Total water system design". Thesis, University of Manchester, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.506647.
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Randall, David William. "Ethnography and system design". Thesis, Manchester Metropolitan University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.274660.
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Tai-Cheng, Yang. "Power system stabilizer design". Thesis, University of Manchester, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245278.
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Owens, T. J. "Robust control system design]". Thesis, University of Strathclyde, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381724.
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Abbott, Ben A., Maria S. Araujo, Myron L. Moodie, Todd A. Newton e Thomas B. Grace. "iNET System Design Concepts". International Foundation for Telemetering, 2011. http://hdl.handle.net/10150/595611.
Testo completoAbstract (sommario):
ITC/USA 2011 Conference Proceedings / The Forty-Seventh Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2011 / Bally's Las Vegas, Las Vegas, NevadaOne of the core philosophies of the integrated Network Enhanced Telemetry (iNET) project is to leverage standard networking technologies whenever possible to both reduce development cost and to allow standard networking applications to function. This paper presents decisions about the system's behavioral design and other decisions affecting the selection and design of system components. The TmNS is a network of networks that must be integrated into existing range processes. An overall guiding tenet for the TmNS is enhancement rather than replacement. As such, this enhancement is melded with pre-existing devices, approaches, and technologies. Overall, the pre-existing Pulse Code Modulation (PCM) data delivery mechanism is augmented with bi-directional, reliable, TmNS-provided communication.
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Pattison, Rachel Lesley. "Safety system design optimisation". Thesis, Loughborough University, 2000. https://dspace.lboro.ac.uk/2134/22019.
Testo completoAbstract (sommario):
This thesis investigates the efficiency of a design optimisation scheme that is appropriate for systems which require a high likelihood of functioning on demand. Traditional approaches to the design of safety critical systems follow the preliminary design, analysis, appraisal and redesign stages until what is regarded as an acceptable design is achieved. For safety systems whose failure could result in loss of life it is imperative that the best use of the available resources is made and a system which is optimal, not just adequate, is produced. The object of the design optimisation problem is to minimise system unavailability through manipulation of the design variables, such that limitations placed on them by constraints are not violated. Commonly, with mathematical optimisation problem; there will be an explicit objective function which defines how the characteristic to be minimised is related to the variables. As regards the safety system problem, an explicit objective function cannot be formulated, and as such, system performance is assessed using the fault tree method. By the use of house events a single fault tree is constructed to represent the failure causes of each potential design to overcome the time consuming task of constructing a fault tree for each design investigated during the optimisation procedure. Once the fault tree has been constructed for the design in question it is converted to a BDD for analysis. A genetic algorithm is first employed to perform the system optimisation, where the practicality of this approach is demonstrated initially through application to a High-Integrity Protection System (HIPS) and subsequently a more complex Firewater Deluge System (FDS). An alternative optimisation scheme achieves the final design specification by solving a sequence of optimisation problems. Each of these problems are defined by assuming some form of the objective function and specifying a sub-region of the design space over which this function will be representative of the system unavailability. The thesis concludes with attention to various optimisation techniques, which possess features able to address difficulties in the optimisation of safety critical systems. Specifically, consideration is given to the use of a statistically designed experiment and a logical search approach.
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Wanner, Shannon. "Phased array system design". [Ames, Iowa : Iowa State University], 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3383372.
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Moolman, G. Chris. "A relational database management systems approach to system design /". This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-07102009-040421/.
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Ressler, Kyle T. (Kyle Thomas). "Flexibility in ballpark design". Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/90723.
Testo completoAbstract (sommario):
Thesis: S.M. in Engineering and Management, Massachusetts Institute of Technology, Engineering Systems Division, System Design and Management Program, 2014.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 106-110).
This thesis documents the potential value of using flexible design to implement Major League Ballparks (MLBP). Credible evidence suggests that most ballparks were designed to fixed specifications that do not facilitate improvements after the park opens. By contrast, flexible designs include options such as increasing seating capacity, adding luxury boxes, installing a retractable roof, or even converting spaces to accommodate alternative uses. The analysis estimated the economic value of flexible MLBP by comparing fixed and flexible designs. Fixed designs were based on deterministic forecasts of future conditions and largely ignore the uncertainties that affect the economic value of ballparks. Flexible designs recognize the great uncertainties concerning future attendance, concessions spend, weather, and inflation rate. Flexible designs both anticipate and plan for these uncertainties. The economic evaluations used 30-year Net Present Value Monte Carlo simulations of possible futures. They used historical data available at the time of design to estimate the distribution of uncertainties. For the flexible designs, the analysis evaluated the options and determined key parameters such as strike point, base level, and option level. The analysis is based on actual ballpark cases. These include two completed ballparks -- for a small market (Minnesota Twins) and a large one (New York Yankees). For these ballparks, the analysis compared the actual ballpark with a flexible design. Additionally the value of amenities such as multi-use spaces, museums, and other features are explored. The results show that flexible design can significantly improve the long-term financial prospects of ballparks. It can lower initial investments and thus the Value at Risk (VAR). It can also increase the potential to cash in on favorable circumstances, that is, to increase the Value to Gain (VAG). While the specifics of each flexible design differ the overall conclusion is similar: Projects that embrace flexible design expect to achieve better long-term financial results.
by Kyle T. Ressler.
S.M. in Engineering and Management
33
Schulz, Steven Ernest. "System interactions and design considerations for distributed power systems". Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-03022010-020127/.
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Aikenhead, Michael. "Legal knowledge-based systems : new directions in system design". Thesis, Durham University, 2001. http://etheses.dur.ac.uk/4384/.
Testo completoAbstract (sommario):
This thesis examines and critiques the concept of 'legal knowledge-based’ systems. Work on legal knowledge-based systems is dominated by work in 'artificial intelligence and law’. It seeks to automate the application of law and to automate the solution of legal problems. Automation however, has proved elusive. In contrast to such automation, this thesis proposes the creation of legal knowledge-based systems based on the concept of augmentation of legal work. Focusing on systems that augment legal work opens new possibilities for system creation and use. To inform how systems might augment legal work, this thesis examines philosophy, psychology and legal theory for information they provide on how processes of legal reasoning operate. It is argued that, in contrast to conceptions of law adopted in artificial intelligence and law, 'sensemaking' provides a useful perspective with which to create systems. It is argued that visualisation, and particularly diagrams, are an important and under considered element of reasoning and that producing systems that support diagramming of processes of legal reasoning would provide useful support for legal work. This thesis reviews techniques for diagramming aspects of sensemaking. In particular this thesis examines standard methods for diagramming arguments and methods for diagramming reasoning. These techniques are applied in the diagramming of legal judgments. A review is conducted of systems that have been constructed to support the construction of diagrams of argument and reasoning. Drawing upon these examinations, this thesis highlights the necessity of appropriate representations for supporting reasoning. The literature examining diagramming for reasoning support provides little discussion of appropriate representations. This thesis examines theories of representation for insight they can provide into the design of appropriate representations. It is concluded that while the theories of representation that are examined do not determine what amounts to a good representation, guidelines for the design and choice of representations can be distilled. These guidelines cannot map the class of legal knowledge-based systems that augment legal sensemaking, they can however, be used to explore this class and to inform construction of systems.
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Martin, Philippe J. F. "Large scale C3 systems : experiment design and system improvement". Thesis, Laboratory for Information and Decision Systems, Massachusetts Institute of Technology, 1986. http://hdl.handle.net/1721.1/15061.
Testo completoAbstract (sommario):
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1986.Includes bibliographical references (p. 105-106).
Research supported by the Joint Directors of Laboratories through the Office of Naval Research. N00014-85-K-0782
Philippe J. F. Martin.
M.S.
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Moolman, George Christiaan. "A relational database management systems approach to system design". Thesis, Virginia Tech, 1992. http://hdl.handle.net/10919/43628.
Testo completoAbstract (sommario):
Systems are developed to fulfill certain requirements. Several system design configurations usually can fulfill the technical requirements, but at different equivalent life-cycle costs. The problem is how to manipulate and evaluate different system configurations so that the required system effectiveness can be achieved at a minimum equivalent cost. It is also important to have a good definition of all the major consequences of each design configuration. For each alternative configuration considered, it is useful to know the number of units to deploy, the inventory and other logistic requirements, as well as the sensitivity of the system to changes in input variable values.
An intelligent relational database management system is defined to solve the problem described. Table structures are defined to maintain the required data elements and algorithms are constructed to manipulate the data to provide the necessary information. The methodology is as follows: Customer requirements are analyzed in functional terms. Feasible design alternatives are considered and defined as system design configurations. The reliability characteristics of each system configuration are determined, initially from a system-level allocation, and later determined from test and evaluation data. A maintenance analysis is conducted to determine the inventory requirements (using reliability data) and the other logistic requirements for each design configuration. A vector of effectiveness measures can be developed for each customer, depending on objectives, constraints, and risks. These effectiveness measures, consisting of a combination of performance and cost measures, are used to aid in objectively deciding which alternative is preferred.
Relationships are defined between the user requirements, the reliability and maintainability of the system, the number of units deployed, the inventory level, and other logistic characteristics of the system. A heuristic procedure is developed to interactively manipulate these parameters to obtain a good solution to the problem with technical performance and cost measures as criteria. Although it is not guaranteed that the optimal solution will be found, a feasible solution close to the optimal will be found. Eventually the user will have, at any time, the ability to change the value of any parameter modeled. The impact on the total system will subsequently be made visible.Master of Science
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Zhong, Zhian. "Power Systems Frequency Dynamic Monitoring System Design and Applications". Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/28707.
Testo completoAbstract (sommario):
Recent large-scale blackouts revealed that power systems around the world are far from the stability and reliability requirement as they suppose to be. The post-event analysis clarifies that one major reason of the interconnection blackout is lack of wide area information. Frequency dynamics is one of the most important parameters of an electrical power system. In order to understand power system dynamics effectively, accurately measured wide-area frequency is needed. The idea of building an Internet based real-time GPS synchronized wide area Frequency Monitoring Network (FNET) was proposed to provide the imperative dynamic information for the large-scale power grids and the implementation of FNET has made the synchronized observations of the entire US power network possible for the first time. The FNET system consists of Frequency Disturbance Recorders (FDR), which work as the sensor devices to measure the real-time frequency at 110V single-phase power outlets, and an Information Management System (IMS) to work as a central server to process the frequency data. The device comparison between FDR and commercial PMU (Phasor Measurement Unit) demonstrate the advantage of FNET. The web visualization tools make the frequency data available for the authorized users to browse through Internet.
The research work addresses some preliminary observations and analyses with the field-measured frequency information from FNET. The original algorithms based on the frequency response characteristic are designed to process event detection, localization and unbalanced power estimation during frequency disturbances. The analysis of historical cases illustrate that these algorithms can be employed in real-time level to provide early alarm of abnormal frequency change to the system operator. The further application is to develop an adaptive under frequency load shedding scheme with the processed information feed in to prevent further frequency decline in power systems after disturbances causing dangerous imbalance between the load and generation.Ph. D.
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Hasegawa, Marnie Tardieu. "Systems engineering design for operations directorate administrative information system". Master's thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-10242009-020024/.
Testo completo
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Eriksson, Daniel. "Diagnosability analysis and FDI system design for uncertain systems". Licentiate thesis, Linköpings universitet, Fordonssystem, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-89947.
Testo completoAbstract (sommario):
Our society depends on advanced and complex technical systems and machines, for example, cars for transportation, industrial robots in production lines, satellites for communication, and power plants for energy production. Consequences of a fault in such a system can be severe and result in human casualties, environmentally harmful emissions, high repair costs, or economical losses caused by unexpected stops in production lines. Thus, a diagnosis system is important, and in some applications also required by legislations, to monitor the system health in order to take appropriate preventive actions when a fault occurs. Important properties of diagnosis systems are their capability of detecting and identifying faults, i.e., their fault detectability and isolability performance. This thesis deals with quantitative analysis of fault detectability and isolability performance when taking model uncertainties and measurement noise into consideration. The goal is to analyze diagnosability performance given a mathematical model of the system to be monitored before a diagnosis system is developed. A measure of fault diagnosability performance, called distinguishability, is proposed based on the Kullback-Leibler divergence. For linear descriptor models with Gaussian noise, distinguishability gives an upper limit for the fault to noise ratio of any linear residual generator. Distinguishability is used to analyze fault detectability and isolability performance of a non-linear mean value engine model of gas flows in a heavy duty diesel engine by linearizing the model around different operating points. It is also shown how distinguishability is used for determine sensor placement, i.e, where sensors should be placed in a system to achieve a required fault diagnosability performance. The sensor placement problem is formulated as an optimization problem, where minimum required diagnosability performance is used as a constraint. Results show that the required diagnosability performance greatly affects which sensors to use, which is not captured if not model uncertainties and measurement noise are taken into consideration. Another problem considered here is the on-line sequential test selection problem. Distinguishability is used to quantify the performance of the different test quantities. The set of test quantities is changed on-line, depending on the output of the diagnosis system. Instead of using all test quantities the whole time, changing the set of active test quantities can be used to maintain a required diagnosability performance while reducing the computational cost of the diagnosis system. Results show that the number of used test quantities can be greatly reduced while maintaining a good fault isolability performance. A quantitative diagnosability analysis has been used during the design of an engine misfire detection algorithm based on the estimated torque at the flywheel. Decisions during the development of the misfire detection algorithm are motivated using quantitative analysis of the misfire detectability performance. Related to the misfire detection problem, a flywheel angular velocity model for misfire simulation is presented. An evaluation of the misfire detection algorithm show results of good detection performance as well as low false alarm rate.
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CARDILE, DIEGO. "System of Systems conceptual design methodology for space exploration". Doctoral thesis, Politecnico di Torino, 2013. http://hdl.handle.net/11583/2511716.
Testo completoAbstract (sommario):
The scope of the research is to identify and develop a design methodology for System-of-System (a set of elements and sub-elements able to interact and cooperate in order to complete a mission), based on models, methods and tools, to support the decision makers during the space exploration scenarios design and evaluation activity in line with the concurrent design philosophy.
Considering all combinations of system parameters (such as crew size, orbits, launchers, spacecraft, ground and space infrastructures), a large number of mission concept options are possible, even though not all of them are optimal or even feasible. The design methodology is particularly useful in the first phases of the design process (Phase 0 and A) to choose rationally and objectively the best mission concepts that ensure the higher probability of mission success in compliance with the high level requirements deriving from the “user needs”.
The first phases of the project are particularly critical for the success of the entire mission because the results of this activity are the starting point of the more costly detailed design phases. Thus, any criticality in the baseline design will involve inevitably into undesirable and costly radical system redesigns during the advanced design phases. For this reason, it is important to develop reliable mathematical models that allow prediction of the system performances notwithstanding the poorly defined environment of very high complexity.
In conjunction with the development of the design methodology for system-of-systems and in support of it, a software tool has been developed. The tool has been developed into Matlab environment and provides users with a useful graphical interface. The tool integrates the model of the mission concept, the models of the space elements at system and subsystem level, the cost-effectiveness model or value, the sensitivity and multi-objective optimization analysis. The tool supports users to find a system design solution in compliance with requirements and constraints, such as mass budgets and costs, and provides them with information about cost-effectiveness of the mission.
The developed methodology has been applied for the design of several space elements (Man Tended Free Flyer, Cargo Logistic Vehicle, Rover Locomotion System) and several mission scenarios (Moon surface infrastructure support, Cis-Lunar infrastructure delivering, Cis-Lunar infrastructure logistic support), in order to assess advantages and disadvantages of the proposed method.
The results of the design activity have been discussed and accepted by the European Space Agency (ESA) and have also been compared and presented to the scientific community. Finally, in a particular case, the study of the locomotion system of a lunar rover, the results of the methodology have been verified through the production and testing of the same system.
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Larson, Bradley Jared. "Mathematical Framework for Early System Design Validation Using Multidisciplinary System Models". BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3000.
Testo completoAbstract (sommario):
A significant challenge in the design of multidisciplinary systems (e.g., airplanes, robots, cell phones) is to predict the effects of design decisions at the time these decisions are being made early in the design process. These predictions are used to choose among design options and to validate design decisions. System behavioral models, which predict a system's response to stimulus, provide an analytical method for evaluating a system's behavior. Because multidisciplinary systems contain many different types of components that have diverse interactions, system behavioral models are difficult to develop early in system design and are challenging to maintain as designs are refined. This research develops methods to create, verify, and maintain multidisciplinary system models developed from models that are already part of system design. First, this research introduces a system model formulation that enables virtually any existing engineering model to become part of a large, trusted population of component models from which system behavioral models can be developed. Second, it creates a new algorithm to efficiently quantify the feasible domain over which the system model can be used. Finally, it quantifies system model accuracy early in system design before system measurements are available so that system models can be used to validate system design decisions. The results of this research are enabling system designers to evaluate the effects of design decisions early in system design, improving the predictability of the system design process, and enabling exploration of system designs that differ greatly from existing solutions.
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Chakraborty, Suranjan. "Exploring the effectiveness of requirements elicitation process during information systems development a multi-perspective approach /". Online access for everyone, 2008. http://www.dissertations.wsu.edu/Dissertations/Summer2008/s_chakraborty_071508.pdf.
Testo completo
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Parrish, James L. "Sensemaking in information systems toward a sensemaking inquiring system /". Orlando, Fla. : University of Central Florida, 2008. http://purl.fcla.edu/fcla/etd/CFE0002253.
Testo completo
44
Zhao, Zhenwei 1975. "Manufacturing system research for a design point of view : optimization vs. system design". Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/89897.
Testo completo
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Evbuomwan, Nosayaba Francis Osa. "Design function deployment : a concurrent engineering design system". Thesis, City University London, 1994. http://openaccess.city.ac.uk/7540/.
Testo completoAbstract (sommario):
The current state of activities in the design and manufacturing industry is marked by the various CAD/CAM/CAE systems which exist as islands of automation, and are used by engineers and designers in a non-integrated and ill-structured way. Thus the design problem is examined from separate and different perspectives, rather than as a whole. The goal of this research, is to develop a comprehensive, integrated and generic design system, that will ensure the realisation of concurrent engineering in practice. To this end, Design Function Deployment (DFD) has been developed. DFD enables the capture of customers' requirements, the establishment of design specifications and constraints in a solution neutral form, the generation of conceptual designs (architectures), the development of detailed designs layouts), the selection of materials and associated manufacturing processes and the development of suitable production plans. The generated design solutions are optimised against a composite set of multi-criteria (attributes) in a concurrent manner for key factors such as performance, robustness and cost as well as other life cycle issues (manufacture, assembly, serviceability, reliability, environment, etc) in order to choose the most satisfying design. DFD provides a recipe of design methods to support the designer or design team at any stage of the design process. The optimisation process involves the use of these supporting design tools (methods) encapsulated within it. DFD also provides an integrated product modelling environment which integrates both textual and geometric design information, and enables the capture of other design information related to design intent, rationale and history. The research that led to the evolution and development of DFD involved (a) a detailed investigation and research on Quality Function Deployment, QFD, a technique well suited for capturing and translating customer requirements into design specifications, (b) an extensive review of design philosophies, models, methods and systems and (c) an extensive investigation into concurrent engineering. The findings of this research has led to the development of the structure of the DFD system, which incorporates (1) a prescriptive design model, (2) a suite of design methods and (3) supporting knowledge/rulebases and databases, which are used for the generation of the design solution space and the optimal selection of the most satisfying design for subsequent implementation.
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Aude, J. S. "Design rule representation within a hardware design system". Thesis, University of Manchester, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377479.
Testo completo
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Akinwale, Olawale A. (Olawale Akintunde). "System architecture design of a robust heating system". Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/110130.
Testo completoAbstract (sommario):
Thesis: S.M. in Engineering and Management, Massachusetts Institute of Technology, School of Engineering, System Design and Management Program, 2017.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 67-70).
Power outages are exponentially increasing because extreme weather conditions are occurring more frequently. In addition, the duration of the power outages are increasing. Unfortunately, the will to expand or convert the current electric grid is not there. The objective of this thesis is to design a new system - at a high level - that would protect homeowners from the effects of power outages. To do this, interviews were conducted with people who have actually experienced power outages during winter. Their preference for continued space heating during power outages prompted a design that uses natural gas fuel cell to power a furnace (or boiler) independent of the electric grid. The same system could also provide electricity to the homeowners, if the furnace is turned off. In addition to the system architecture design, surveys were conducted to determine pricing and financial analyses were performed to determine the commercial viability of the design. Consequently, the design proved to be too expensive. What's more, prices would have to drop significantly and / or other stakeholders, such as utility companies, insurance companies and governments, would have to cover most of the cost of the product for there to be a mass adoption.
by Olawale A. Akinwale.
S.M. in Engineering and Management
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Pfaender, Jens Holger. "Competitive Assessment of Aerospace Systems using System Dynamics". Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14014.
Testo completoAbstract (sommario):
Aircraft design has recently experienced a trend away from performance centric design towards a more balanced approach with increased emphasis on engineering an economically successful system. This approach focuses on bringing forward a comprehensive economic and life-cycle cost analysis, which can be addressed by the introduction of a dynamic method allowing the analysis of the future attractiveness of such a concept in the presence of uncertainty. One way of addressing this is through the use of a competitive market model. However, existing market models do not focus on the dynamics of the market, which results in poor predictive capabilities.
The method proposed here focuses on a top-down approach that integrates a competitive model based on work in the field of system dynamics into the aircraft design process. The primary contribution is the demonstration of the feasibility of such integration. This integration is achieved through the use of surrogate models, which enabled not only the practical integration of analysis techniques, but also reduced the computational requirements so that interactive exploration as envisioned is actually possible. An example demonstration of this integration is built on the competition in the 250 seat large commercial aircraft market. Two aircraft models were calibrated to existing performance and certification data and then integrated into the system dynamics market model, which was then calibrated with historical market data. This calibration showed a much improved predictive capability as compared to the conventional logit regression models.
The resulting market model was then integrated into a prediction profiler environment with a time variant Monte-Carlo analysis resulting in a unique trade-off environment. This environment was shown to allow interactive trade-off between aircraft design decisions and economic considerations while allowing the exploration potential market success in the light of varying external market conditions and scenarios.
Another use of the existing outputs of the Monte-Carlo analysis was then realized by visualizing the model variables on a multivariate scatter plot. This enables the designer to define strategic market and return on investment goals for a number of scenarios and then directly see which specific aircraft designs meet these goals.
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Tomar, Shivanjali. "PROLOGUE : Health Information System". Thesis, Umeå universitet, Institutionen Designhögskolan, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-79315.
Testo completoAbstract (sommario):
Prologue is a health information system developed for underserved communities in Bihar, India. It is aimed at helping people living in poverty and with low literacy to take the right steps to manage their and their family’s health. Bihar suffers from one of the worst healthcare records in the country. This is as much due to the lack of access to the right information as it is due to the economic condition of the region. The inaccessibility of information is aggravated by the complex social set up in these communities, for e.g. women aren’t allowed to leave their homes and community has the strongest influence on an individual’s decision making. To make sure that right information permeates even to the most inaccessible user groups, especially women and to uplift community’s awareness as a whole, two different communication channels were designed-an interactive radio show and a public installation.
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Rottier, Johannes. "Conceptual design of an organisational capability". Pretoria : [s.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-11092006-121921/.
Testo completo