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1
Sallak, Mohamed. "Évaluation de paramètres de sûreté de fonctionnement en présence d'incertitudes et aide à la conception : application aux Systèmes Instrumentés de Sécurité". Thesis, Vandoeuvre-les-Nancy, INPL, 2007. http://www.theses.fr/2007INPL065N/document.
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L'introduction de systèmes instrumentés dédiés aux applications de sécurité impose l'évaluation de leur sûreté de fonctionnement. On utilise généralement pour cela les bases de données de fiabilité génériques. Cependant, le retour d'expérience pour ces systèmes qui présentent en général des défaillances rares est insuffisant pour valider les résultats obtenus. En outre, la collecte de données de fiabilité et leur extrapolation à d'autres composants introduisent des incertitudes. Les travaux de cette thèse portent sur la problématique de la prise en compte des incertitudes relatives aux données de fiabilité des composants pour l'évaluation de la sûreté de fonctionnement des systèmes par le formalisme des sous ensembles flous. La méthodologie proposée est appliquée à l'évaluation des probabilités de défaillance des Systèmes Instrumentés de Sécurité (SIS) en présence de données de fiabilité imprécises. Nous introduisons deux nouveaux facteurs d'importance pour aider le concepteur. En outre, nous proposons une méthodologie d'aide à la conception des SIS basée sur la modélisation par réseaux de fiabilité et l'optimisation par des algorithmes génétiques de la structure des SIS pour le respect des niveaux d'intégrité de sécurité (SIL) exigésThe use of safety related systems imposes to evaluate their dependability. Laboratory data and generic data are often used to provide failure data of safety components to evaluate their dependability parameters. However, due to the lower solicitation of safety systems in plant, safety components have not been operating long enough to provide statistical valid failure data. Furthermore, measuring and collecting failure data have uncertainty associated with them, and borrowing data from laboratory and generic data sources involve uncertainty as well. Our contribution is to propose a fuzzy approach to evaluate dependability parameters of safety systems when there is an uncertainty about dependability parameters of systems components. This approach is applied to determine the failure probability on demand of Safety Instrumented Systems (SIS) in presence of uncertainty. Furthermore, we present an optimal design of SIS by using reliability graphs and genetic algorithms to identify the choice of components and design configuration in a SIS to meet the required SIL
2
Patel, Chintan. "Evaluating Trench Safety Using Fuzzy Logic Concept and Fuzzy Set Models". The Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1419353000.
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Naman, Saleem Muhammad. "Eigen Fuzzy Sets of Fuzzy Relation with Applications". Thesis, Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-4060.
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Eigen fuzzy sets of fuzzy relation can be used for the estimation of highest and lowest levels of involved variables when applying max-min composition on fuzzy relations. By the greatest eigen fuzzy sets (set which can be greater anymore) maximum membership degrees of any fuzzy set can be found, with the help of least eigen fuzzy set (set which can be less anymore) minimum membership degrees of any fuzzy sets can be found as well.The lowest and highest level, impact or e ffect of anything can be found by applying eigen fuzzy set theory. The implicational aspect of this research study is medical and customer satisfaction level measurement. By applying methods of eigen fuzzy set theory the e ffectiveness of medical cure and customer satisfaction can be found with high precision.
4
Al-Kaabi, Noura Salem. "A fuzzy-based construction safety advisor (CSA) for construction safety in the United Arab". The Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=osu1147971772.
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King, Jonathan R. "New applications of fuzzy logic". Thesis, University of East Anglia, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365021.
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Liao, I.-En. "Fuzzy time and its applications /". The Ohio State University, 1990. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487676847117812.
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Chou, Te-Shun. "Fuzzy special logic functions and applications". FIU Digital Commons, 1992. http://digitalcommons.fiu.edu/etd/2347.
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In this thesis, four special logic functions (threshold functions, monotone increasing functions, monotone decreasing functions, and unate functions) are extended to more general functions which allows the activities of these special functions to be a "fuzzy" rather than a "1-or-O" process. These special logic functions are called as fuzzy special logic functions and are based on the concepts and techniques developed in fuzzy logic and fuzzy languages. The algorithms of determining C(n), Cmax(n) and generating the most dissimilar fuzzy special logic functions as well as important properties and results are investigated. Examples are given to illustrated these special logic functions. In addition, their applications -- function representation, data compression, error correction, and monotone flash analog to digital converter, their relationships, and fuzzy classification are also presented. It is obviously shown that fuzzy logic theory can be used successfully on these four special logic functions in order to normalize the grade of membership function μ in the interval [0 1]. As a result, the techniques described in this thesis may be of use in the study of other special logic functions and much fertile field work is great worth researching and developing.
8
Maistralis, Eleftherios. "Formal safety assessment of marine applications". Thesis, Liverpool John Moores University, 2007. http://researchonline.ljmu.ac.uk/5843/.
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This research has first established that it is based on multiple methodologies developed to tackle the areas of engineering cargo handling systems, both at port and on-board vessels, as well as in the area of organisational self-assessment. It continued in reviewing the current status and future aspects of marine safety assessment together with an examination of a few major accidents. The major problems identified in marine safety assessment in this research are associated with inappropriate treatment of uncertainty in data and human error issues during the risk modelling estimation process and the calculation of failure probabilities. Following the identification of the research needs, this thesis has developed several analytical models for the safety assessment of cargo handling systems and organisational assessment structure. Such models can be effectively integrated into a risk-based framework using the marine formal safety assessment, safety case concepts. Bayesian network (BN) and evidential reasoning (ER) approaches applicable to cargo handling engineering systems have been proposed for systematically and effectively addressing uncertainty due to randomness and vagueness in data respectively. ER test cases for both a vessel selection process and a comparison of the safety maturity of different organisations in terms of self-assessment have been produced within a domain in which main and sub criteria have been developed for assessment reasons a long with the combination of the proposed model with existing organisational models. BN test case for a Liquefied Petroleum Gas (LPG) reliquefaction plant has been produced within a cause-effect domain in which Bayes' theorem is the focal mechanism of inference processing. A methodology aiming in finding the probability of failure when having variables ruled by uncertainty is established using certain variable transformation methods through the First and Second order reliability methodologies. Form/Sorm produces a most likely failure point, which is demonstrated through the application at a port cargo handling crane system. The outcomes have the potential to facilitate the decision-making process in a risk-based framework. Finally, the results of the research are summarised and areas where further research is required to improve the developed methodologies are outlined.
9
Bashon, Yasmina Massoud. "Contributions to fuzzy object comparison and applications : similarity measures for fuzzy and heterogeneous data and their applications". Thesis, University of Bradford, 2013. http://hdl.handle.net/10454/6305.
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This thesis makes an original contribution to knowledge in the fi eld of data objects' comparison where the objects are described by attributes of fuzzy or heterogeneous (numeric and symbolic) data types. Many real world database systems and applications require information management components that provide support for managing such imperfect and heterogeneous data objects. For example, with new online information made available from various sources, in semi-structured, structured or unstructured representations, new information usage and search algorithms must consider where such data collections may contain objects/records with di fferent types of data: fuzzy, numerical and categorical for the same attributes. New approaches of similarity have been presented in this research to support such data comparison. A generalisation of both geometric and set theoretical similarity models has enabled propose new similarity measures presented in this thesis, to handle the vagueness (fuzzy data type) within data objects. A framework of new and unif ied similarity measures for comparing heterogeneous objects described by numerical, categorical and fuzzy attributes has also been introduced. Examples are used to illustrate, compare and discuss the applications and e fficiency of the proposed approaches to heterogeneous data comparison.
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Bashon, Yasmina M. "Contributions to fuzzy object comparison and applications. Similarity measures for fuzzy and heterogeneous data and their applications". Thesis, University of Bradford, 2013. http://hdl.handle.net/10454/6305.
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This thesis makes an original contribution to knowledge in the fi eld
of data objects' comparison where the objects are described by attributes
of fuzzy or heterogeneous (numeric and symbolic) data types.
Many real world database systems and applications require information
management components that provide support for managing
such imperfect and heterogeneous data objects. For example,
with new online information made available from various sources, in
semi-structured, structured or unstructured representations, new information
usage and search algorithms must consider where such data
collections may contain objects/records with di fferent types of data:
fuzzy, numerical and categorical for the same attributes.
New approaches of similarity have been presented in this research to
support such data comparison. A generalisation of both geometric and set theoretical similarity models has enabled propose new similarity
measures presented in this thesis, to handle the vagueness (fuzzy data
type) within data objects. A framework of new and unif ied similarity
measures for comparing heterogeneous objects described by numerical,
categorical and fuzzy attributes has also been introduced.
Examples are used to illustrate, compare and discuss the applications
and e fficiency of the proposed approaches to heterogeneous data comparison.Libyan Embassy
11
Hanss, Michael. "Applied fuzzy arithmetic : an introduction with engineering applications /". Berlin [u.a.] : Springer, 2005. http://www.loc.gov/catdir/enhancements/fy0662/2004117177-d.html.
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Ho, Duc Thang. "Context dependent fuzzy modelling and its applications". Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/13574/.
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Fuzzy rule-based systems (FRBS) use the principle of fuzzy sets and fuzzy logic to describe vague and imprecise statements and provide a facility to express the behaviours of the system with a human-understandable language. Fuzzy information, once defined by a fuzzy system, is fixed regardless of the circumstances and therefore makes it very difficult to capture the effect of context on the meaning of the fuzzy terms. While efforts have been made to integrate contextual information into the representation of fuzzy sets, it remains the case that often the context model is very restrictive and/or problem specific. The work reported in this thesis is our attempt to create a practical frame work to integrate contextual information into the representation of fuzzy sets so as to improve the interpretability as well as the accuracy of the fuzzy system. Throughout this thesis, we have looked at the capability of the proposed context dependent fuzzy sets as a stand alone as well as in combination with other methods in various application scenarios ranging from time series forecasting to complicated car racing control systems. In all of the applications, the highly competitive performance nature of our approach has proven its effectiveness and efficiency compared with existing techniques in the literature.
13
Mahlasela, Zuko. "Finite fuzzy sets, keychains and their applications". Thesis, Rhodes University, 2009. http://hdl.handle.net/10962/d1005220.
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The idea of keychains, an (n+1)-tuple of non-increasing real numbers in the unit interval always including 1, naturally arises in study of finite fuzzy set theory. They are a useful concept in modeling ideas of uncertainty especially those that arise in Economics, Social Sciences, Statistics and other subjects. In this thesis we define and study some basic properties of keychains with reference to Partially Ordered Sets, Lattices, Chains and Finite Fuzzy Sets. We then examine the role of keychains and their lattice diagrams in representing uncertainties that arise in such problems as in preferential voting patterns, outcomes of competitions and in Economics - Preference Relations.
14
Niittymäki, Jarkko. "Fuzzy traffic signal control principles and applications /". Espoo, Finland : Helsinki University of Technology, 2002. http://lib.hut.fi/Diss/2002/isbn9512257017/isbn9512257017.pdf.
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Dissertation for the degree of Doctor of Science in Technology--Helsinki University of Technology, Espoo, 2002."ISSN 0781-5816." Includes bibliographical references (p. 65-71). Available online as a PDF file via the World Wide Web.
15
Wu, Weihang. "Architectural Reasoning for Safety Critical Software Applications". Thesis, University of York, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485150.
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In recent years, there has been substantial move towards architecture-based development for safety-critical software applications. Nevertheless, techniques for architectural design have not been developed to the extent necessary to guarantee the safety of these systems. In particular, current practices often focus upon architectural modelling without making the underlying design deliberation explicit. Although a number of protection mechanisms have been codified in both research and practice, there is little practical guidance mi how to exploit them to address application-specific safety concerns. This thesis defines and demonstrates a coherent and effective approach to eliciting and formulating safety concerns, evaluating and mitigating safety concerns, and arguing about safety within the evolutionary architecting process. The elicitation and formulation of safety concerns are based upon the unification of goals and scenarios from both positive .and negative perspectives. The evaluation of safety concerns is based upon the application of Object-Oriented Bayesian Belief Networks and mitigation space is informed by the evaluation results and the formulation of safety concerns. Safety argumentation of architectures is based upon the definition of a set of patterns of argument. Guidance on safety argument review is also provided. Through addressing safety concerns in the early system development lifecyc1e, there can be an increased level of design confidence in the architectures developed for safety-critical software applications. Evaluation of the approach is conducted through a number of academic and industrial case studies.
16
Haylock, James Alexander. "Fault tolerant drives for safety critical applications". Thesis, University of Newcastle Upon Tyne, 1998. http://hdl.handle.net/10443/352.
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The correct operation of adjustable speed drives, which form part of a larger system, is often essential to the operation of the system as a whole. In certain applications the failure of such a drive could result in a threat to human safety and these applications are termed 'safety critical'. The chance of a component failure resulting in non-operation of the drive can be dramatically reduced by adopting a fault tolerant design. A fault tolerant drive must continue to operate throughout the occurrence of any single point failure without undue disturbance to the power output. Thereafter the drive must be capable of producing rated output indefinitely in the presence of the fault. The work presented in this thesis shows that fault tolerance can be achieved without severe penalties in terms of cost or power to mass ratio. The design of a novel permanent magnet drive is presented and a 'proof of concept' demonstrator has been built, based on a 20 kW, 13000 RPM aircraft fuel pump specffication. A novel current controller with near optimal transient performance is developed to enable precise shaping of the phase currents at high shaft speeds. The best operating regime for the machine is investigated to optimise the power to mass ratio of the drive. A list of the most likely electrical faults is considered. Some faults result in large fault currents and require rapid detection to prevent fault propagation. Several novel fault sensors are discussed. Fault detection and identification schemes are developed, including new schemes for rapid detection of turn to turn faults and power device short circuit faults. Post fault control schemes are described which enable the drive to continue to operate indefinitely in the presence of each fault. Finally, results show the initially healthy drive operating up to, through and beyond the introduction of each of the most serious faults.
17
Martin, Lesley. "Intelligent system selection for safety-related applications". Thesis, University of Strathclyde, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.438217.
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Kurd, Zeshan. "Artificial neural networks in safety-critical applications". Thesis, University of York, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.428472.
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An, Hong. "Computer-aided applications in process plant safety". Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/6418.
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Process plants that produce chemical products through pre-designed processes are fundamental in the Chemical Engineering industry. The safety of hazardous processing plants is of paramount importance as an accident could cause major damage to property and/or injury to people. HAZID is a computer system that helps designers and operators of process plants to identify potential design and operation problems given a process plant design. However, there are issues that need to be addressed before such a system will be accepted for common use. This research project considers how to improve the usability and acceptability of such a system by developing tools to test the developed models in order for the users to gain confidence in HAZID s output as HAZID is a model based system with a library of equipment models. The research also investigates the development of computer-aided safety applications and how they can be integrated together to extend HAZID to support different kinds of safety-related reasoning tasks. Three computer-aided tools and one reasoning system have been developed from this project. The first is called Model Test Bed, which is to test the correctness of models that have been built. The second is called Safe Isolation Tool, which is to define isolation boundary and identify potential hazards for isolation work. The third is an Instrument Checker, which lists all the instruments and their connections with process items in a process plant for the engineers to consider whether the instrument and its loop provide safeguards to the equipment during the hazard identification procedure. The fourth is a cause-effect analysis system that can automatically generate cause-effect tables for the control engineers to consider the safety design of the control of a plant as the table shows process events and corresponding process responses designed by the control engineer. The thesis provides a full description of the above four tools and how they are integrated into the HAZID system to perform control safety analysis and hazard identification in process plants.
20
Wang, Yuan-Fang. "Computer Vision Analysis for Vehicular Safety Applications". International Foundation for Telemetering, 2015. http://hdl.handle.net/10150/596451.
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ITC/USA 2015 Conference Proceedings / The Fifty-First Annual International Telemetering Conference and Technical Exhibition / October 26-29, 2015 / Bally's Hotel & Convention Center, Las Vegas, NVIn this paper, we present our research on using computer-vision analysis for vehicular safety applications. Our research has potential applications for both autonomous vehicles and connected vehicles. In particular, for connected vehicles, we propose three image analysis algorithms that enhance the quality of a vehicle's on-board video before inter-vehicular information exchange takes place. For autonomous vehicles, we are investigating a visual analysis scheme for collision avoidance during back up and an algorithm for automated 3D map building. These algorithms are relevant to the telemetering domain as they involve determining the relative pose between a vehicle and other vehicles on the road, or between a vehicle and its 3D driving environment, or between a vehicle and obstacles surrounding the vehicle.
21
Soleimani, Hossein. "LTE/LTE-Advanced for Vehicular Safety Applications". Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/37840.
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IEEE 802.11p, the known standard for Vehicular Adhoc NETworks (VANETs), suffers from scalability issues and unbounded delay. In addition, the desire to use networks already in existence has created motivation for using cellular networks for vehicular applications. LTE-Advanced is one of the most promising access technologies in the wireless field, providing high data rate, low latency, and a large coverage area. Thus, LTE/LTE-A can be potential access technologies for supporting vehicular applications. Vehicular safety applications are based on broadcasting messages to neighboring vehicles. The vehicle location precision is crucial for safety applications. Thus, the freshness of the information (i.e. vehicle location) at the neighboring vehicles is very important. As LTE is an infrastructure-based network, all transmissions should pass through it. When the load of the network is high compared to the available resources, large delays may occur.
The focus of this thesis is to propose solutions to make LTE suitable for vehicular safety applications. The first solution is to adapt the vehicular safety application to be suitable in LTE network. For this purpose, we propose an adaptation of the safety message generation rate. This adaptation uses a queueing model to compute the freshness of the information of vehicles at the destination, based on their message generation rates. It then adjusts the generation periods to provide a similar accuracy for all vehicles. The second approach is to modify the LTE and make it suitable for these kinds of applications. Thus, we proposed a scheduler for LTE which is suitable for vehicular safety applications. It considers the speed and location of the vehicles to allocate the resources to them for the transmission of safety messages. We also studied the message dissemination in the downlink, and proposed an efficient way to deliver the safety messages to the neighboring vehicles. Finally, we propose a scheme that uses both LTE-D2D and LTE-cellular communication for the transmission of safety messages. The centralized location information is used for Device-to-Device (D2D) pair discovery and resource allocation. The proposed scheme provides resource efficiency by enabling the reuse of the resources by vehicles. We also study the effect of the awareness range and period of updating location information at the server on resource usage and accuracy of D2D pair detection.
22
Meireles, Tiago Hipkin. "Wireless protocols to support vehicular safety applications". Doctoral thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/16287.
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Doutoramento em Engenharia ElectrotécnicaIn the last decades the number of vehicles travelling in European road has raised significantly. Unfortunately, this brought a very high number of road accidents and consequently various injuries and fatalities. Even after the introduction of passive safety systems, such as seat belts, airbags, and some active safety systems, such as electronic brake system (ABS) and electronic stabilization (ESP), the number of accidents is still too high. Approximately eight per cent of the fatal accidents occur in motorways, in the Portuguese case, the number of fatalities has remained constant in the first decade of the 21st century. The evolution of wireless communications, along with the north-American and European policies that reserve spectrum near the 5,9GHz band for safety applications in the vehicular environment, has lead to the development of several standards. Many of these applications are based on the possibility of using a wireless communication system to warn drivers and passengers of events occurring on the road that can put at risk their own safety. Some examples of safety applications are the hard-brake warning, the wrong-way warning and the accident warning. This work aims to contribute in defining a communication protocol that guarantees the timely dissemination of safety critical events, occurring in scenarios with a high number of vehicles or in the neighbourhood of so called motorway “blackspots”, to all vehicles in the zone of interest. To ensure information integrity and user trust, the proposed system is based on the motorway infrastructure, which will validate all events reported by the vehicles with the usage of several means, such as video surveillance or other sensors. The usage of motorway infrastructure that has full motorway coverage using fixed stations also known as road side units, allows to have a global vision of the interest zone, avoiding the problems associated to networks that depend solely on vehicle to vehicle communication, generally total ad-hoc networks. By using the infrastructure, it is possible to control medium access, avoiding possible badly intended intrusions and also avoiding the phenomenon known as alarm showers or broadcast storm that occur when all vehicles want to simultaneously access the medium to warn others of a safety event. The thesis presented in this document is that it is possible to guarantee in time information about safety events, using an architecture where the road side units are coordinated among themselves, and communicate with on board units (in vehicles) that dynamically register and deregister from the system. An exhaustive and systematic state of the art of safety applications and related research projects is done, followed by a study on the available wireless communications standards that are able to support them. The set of standards IEEE802.11p and ETSI-G5 was created for this purpose and is found to be the more adequate, but care is taken to define a scenario where WAVE enabled and non-enabled vehicles can coexist. The WAVE medium access control protocol suffers from collision problems that do not guarantee a bounded delay, therefore a new protocol (V-FTT) is proposed, based on the adaptation of the Flexible Time Triggered protocol to the vehicular field. A theoretical analysis of the V-FTT applied to WAVE and ETSI-G5 is done, including quantifying a real scenario based on the A5 motorway from Lisbon to Cascais, one of the busiest Portuguese motorways. We conclude the V-FTT protocol is feasible and guarantees a bounded delay.
Nas últimas décadas tem-se assistido a um aumento do número de veículos a circular nas vias rodoviárias europeias, trazendo consigo um elevado número de acidentes e como consequência muitos feridos e vítimas mortais. Apesar da introdução de sistemas de segurança passivos, tais como cintos de segurança, airbags e de alguns sistemas de segurança activos, tais como o sistema electrónico de travagem (ABS) e o sistema electrónico de estabilidade (ESP), o número de acidentes continua a ser demasiado elevado. Aproximadamente oito por cento dos acidentes fatais na Europa ocorrem em auto-estradas, no caso Português, o número de vítimas mortais tem-se mantido constante ao longo da primeira década do século XXI. A evolução das comunicações sem fios, acompanhada de políticas europeias e norte-americanas no sentido de reservar frequências próximas dos 5,9GHz para aplicações de segurança no ambiente veicular, levou à especificação de várias normas. A maior parte destas aplicações baseiam-se na possibilidade de usar um sistema confiável de comunicação sem fios para alertar os condutores e passageiros de veículos para eventos ocorridos nas estradas que possam colocar em risco a sua segurança. Exemplos de aplicações de segurança crítica são o aviso de travagem brusca, o aviso de veículo em contra mão e o aviso de acidente na estrada. Este trabalho contribui para a definição de protocolos de comunicação capazes de garantir que a informação sobre eventos relacionados com situações de segurança crítica, que ocorram em cenários com um elevado número de veículos em zonas urbanas ou na vizinhança dos chamados “pontos negros” das auto-estradas, é disseminada com pontualidade por todos os veículos localizados na zona de interesse Por uma questão da integridade das comunicações e confiança dos condutores, o sistema proposto baseia-se na infra-estrutura do concessionário da auto-estrada, que validará os eventos reportados pelos veículos usando vários meios à sua disposição, como por exemplo sistemas de videovigilância e outros sensores. O uso de uma infra-estrutura de comunicações, que dispõe de cobertura integral a partir de estações fixas, permite uma visão global da zona coberta, evitando os problemas associados a redes baseadas apenas na comunicação entre veículos, que são em geral totalmente ad-hoc. O uso da infra-estrutura permite, entre outras vantagens, controlar o acesso ao meio, evitando simultaneamente intrusões de estranhos ao sistema e o fenómeno conhecido como “chuva de alarmes” desencadeado quando todos os veículos querem aceder simultaneamente ao meio para avisar os restantes da existência dum evento de segurança crítica. A tese apresentada neste documento defende que é possível garantir informação atempada sobre eventos que põem em risco a segurança dos veículos a partir de uma arquitectura de interligação entre as estações de comunicações fixas, coordenadas entre si, e unidades móveis (veículos) que se registam e se desligam dinamicamente do sistema. Nesta tese faz-se um levantamento exaustivo e sistemático das aplicações de segurança abordando projectos de investigação relacionados, estudam-se as tecnologias de comunicação sem fios disponíveis e a sua possibilidade de suportar aplicações de segurança rodoviária. Desta análise, conclui-se que a norma norte americana WAVE/IEEE802.11p e a europeia ETSI-G5, criadas especificamente para o efeito são as que mais se adequam à finalidade desejada. Considera-se que o cenário de utilização é evolutivo, podendo coexistirem veículos que não dispõem de sistemas de comunicação com outros que suportam a norma WAVE. Dado que o protocolo de acesso ao meio proposto pela norma WAVE não garante um acesso determinístico ao meio partilhado, propõe-se um novo protocolo, o Vehicular Flexible Time-Triggered protocol (VFTT). Faz-se a análise teórica da viabilidade do protocolo proposto para a norma WAVE e respectiva norma europeia (ETSI-G5). Quantifica-se o protocolo VFTT para um cenário real: a auto-estrada A5 Lisboa-Cascais, uma das autoestradas portuguesas mais movimentadas. Conclui-se que o protocolo é viável e garante um atraso restringido temporalmente.
23
Talwanga, Matiki. "Counting of finite fuzzy subsets with applications to fuzzy recognition and selection strategies". Thesis, Rhodes University, 2015. http://hdl.handle.net/10962/d1018186.
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The counting of fuzzy subsets of a finite set is of great interest in both practical and theoretical contexts in Mathematics. We have used some counting techniques such as the principle of Inclusion-Exclusion and the Mõbius Inversion to enumerate the fuzzy subsets of a finite set satisfying different conditions. These two techniques are interdependent with the M¨obius inversion generalizing the principle of Inclusion-Exclusion. The enumeration is carried out each time we redefine new conditions on the set. In this study one of our aims is the recognition and identification of fuzzy subsets with same features, characteristics or conditions. To facilitate such a study, we use some ideas such as the Hamming distance, mid-point between two fuzzy subsets and cardinality of fuzzy subsets. Finally we introduce the fuzzy scanner of elements of a finite set. This is used to identify elements and fuzzy subsets of a set. The scanning process of identification and recognition facilitates the choice of entities with specified properties. We develop a procedure of selection under the fuzzy environment. This allows us a framework to resolve conflicting issues in the market place.
24
Gentile, Michela. "Development of a hierarchical fuzzy model for the evaluation of inherent safety". Diss., Texas A&M University, 2004. http://hdl.handle.net/1969.1/1277.
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Inherent safety has been recognized as a design approach useful to remove or reduce hazards at the source instead of controlling them with add-on protective barriers. However, inherent safety is based on qualitative principles that cannot easily be evaluated and analyzed, and this is one of the major difficulties for the systematic application and quantification of inherent safety in plant design. The present research introduces the use of fuzzy logic for the measurement of inherent safety by proposing a hierarchical fuzzy model. This dissertation establishes a novel conceptual framework for the analysis of inherent safety and proposes a methodology that addresses several of the limitations of the methodologies available for current inherent safety analysis. This research proposes a methodology based on a hierarchical fuzzy model that analyzes the interaction of variables relevant for inherent safety and process safety in general. The use of fuzzy logic is helpful for modeling uncertainty and subjectivities implied in evaluation of certain variables and it is helpful for combining quantitative data with qualitative information. Fuzzy logic offers the advantage of being able to model numerical and heuristic expert knowledge by using fuzzy IF-THEN rules. Safety is traditionally considered a subjective issue because of the high uncertainty associated with its significant descriptors and parameters; however, this research recognizes that rather than subjective, "safety" is a vague problem. Vagueness derives from the fact that it is not possible to define sharp boundaries between safe and unsafe states; therefore the problem is a "matter of degree". The proposed method is computer-based and process simulator-oriented in order to reduce the time and expertise required for the analysis. It is expected that in the future, by linking the present approach to a process simulator, process engineers can develop safety analysis during the early stages of the design in a rapid and systematic way. Another important aspect of inherent safety, rarely addressed, is transportation of chemical substances; this dissertation includes the analysis of transportation hazard by truck using a fuzzy logic-based approach.
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Castillo, Sergio Enrique Pinto. "New fuzzy control architectures applied to industrial applications". Thesis, University of Strathclyde, 2011. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=16781.
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Touzé, Patrick A. "Applications of fuzzy logic to mechanical reliability analysis". Thesis, Virginia Tech, 1993. http://hdl.handle.net/10919/41583.
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Li, Xiang. "Variable modeling of fuzzy phenomena with industrial applications". Master's thesis, University of Cape Town, 2007. http://hdl.handle.net/11427/4383.
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Chen, Ye. "Fuzzy Cognitive Maps: Learning Algorithms and Biomedical Applications". University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1423581705.
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Touz'e, Patrick A. "Applications of fuzzy logic to mechanical reliability analysis /". This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-03142009-040345/.
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Jiao, Yue. "Fuzzy adaptive networks and applications to humanistic systems /". Search for this dissertation online, 2003. http://wwwlib.umi.com/cr/ksu/main.
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Ojdanic, Milos. "SYSTEMATIC LITERATURE REVIEW OF SAFETY-RELATED CHALLENGES FOR AUTONOMOUS SYSTEMS IN SAFETY-CRITICAL APPLICATIONS". Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-43980.
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An increased focus on the development of autonomous safety-critical systems requiresmore attention at ensuring safety of humans and the environment. The mainobjective of this thesis is to explore the state of the art and to identify the safetyrelatedchallenges being addressed for using autonomy in safety-critical systems. Inparticular, the thesis explores the nature of these challenges, the different autonomylevels they address and the type of safety measures as proposed solutions. Above all,we focus on the safety measures by a degree of adaptiveness, time of being activeand their ability of decision making. Collection of this information is performedby conducting a Systematic Literature Review of publications from the past 9 years.The results showed an increase in publications addressing challenges related to theuse of autonomy in safety-critical systems. We managed to identify four high-levelclasses of safety challenges. The results also indicate that the focus of research wason finding solutions for challenges related to full autonomous systems as well assolutions that are independent of the level of autonomy. Furthermore, consideringthe amount of publications, results show that non-learning solutions addressing theidentified safety challenges prevail over learning ones, active over passive solutionsand decisive over supportive solutions.
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Schwager, Mac. "Towards verifiable adaptive control for safety critical applications". Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/32344.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2005.Includes bibliographical references (p. 97-101).
To be implementable in safety critical applications, adaptive controllers must be shown to behave strictly according to predetermined specifications. This thesis presents two tools for verifying specifications relevant to practical direct-adaptive control systems. The first tool is derived from an asymptotic analysis of the error dynamics of a direct adaptive controller and uncertain linear plant. The analysis yields a so called Reduced Linear Asymptotic System, which can be used for designing adaptive systems to meet transient specifications. The tool is demonstrated in two design examples from flight mechanics, and verified in numerical simulation. The second tool developed is an algorithm for direct-adaptive control of plants with magnitude saturation constraints on multiple inputs. The algorithm is a non-trivial extension of an existing technique for single input systems with saturation. Boundeness of all signals is proved for initial conditions in a compact region. In addition, the notion of a class of multi-dimensional saturation functions is introduced. The saturation compensation technique is demonstrated in numerical simulation. Finally, these tools are applied to design a direct-adaptive controller for a realistic multi-input aircraft model to accomplish control reconfiguration in the case of unforeseen failure, damage, or disturbances. A novel control design for incorporating control allocation and reconfiguration is introduced. The adaptive system is shown in numerical simulation to have favorable transient qualities and to give a stable response with input saturation constraints.
by Mac Schwager.
S.M.
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Kumar, Navin. "Visible light communication systems for road safety applications". Doctoral thesis, Universidade de Aveiro, 2011. http://hdl.handle.net/10773/8176.
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Doutoramento em MAP-TeleEsta tese apresenta um estudo exploratório sobre sistemas de comunicação por luz visível e as suas aplicações em sistemas de transporte inteligentes como forma a melhorar a segurança nas estradas. Foram desenvolvidos neste trabalho, modelos conceptuais e analíticos adequados à caracterização deste tipo de sistemas. Foi desenvolvido um protótipo de baixo custo, capaz de suportar a disseminação de informação utilizando semáforos. A sua realização carece de um estudo detalhado, nomeadamente: i) foi necessário obter modelos capazes de descrever os padrões de radiação numa área de serviço pré-definida; ii) foi necessário caracterizar o meio de comunicações; iii) foi necessário estudar o comportamento de vários esquemas de modulação de forma a optar pelo mais robusto; finalmente, iv) obter a implementação do sistema baseado em FPGA e componentes discretos. O protótipo implementado foi testado em condições reais. Os resultados alcançados mostram os méritos desta solução, chegando mesmo a encorajar a utilização desta tecnologia em outros cenários de aplicação.
This thesis presents a study carried out on the exploration of visible light communication (VLC) for road safety applications in intelligent transportation systems (ITS). We developed conceptual and analytical models for the usage of VLC technologies for human safety. A low cost VLC prototype traffic broadcast system was hardware designed and implemented. In order to realize this prototype a number of exhaustive steps have been designed and implemented. An optimized illumination distribution was achieved in a defined service area from LED-based traffic lights associated with a VLC emitter. A traffic light system set-up was modeled and designed for optimum performance. The optical wireless channel was characterized and examined. Depending on the characteristics of the channel and specific applications, a robust modulation technique based on direct sequence spread spectrum using sequence inverse keying (DSSS SIK) was analyzed, developed, and implemented. The complete prototype VLC transceiver system was then implemented with field programmable gate arrays (FPGA) and discrete components. Simulation and experimental validation of system was performed in different scenarios and environments. The obtained results have shown the merits of our approach. A number of findings was experienced which are illustrated at the end. These observations would enhance and encourage potential research in the area and optimize performance of VLC systems for a number of interesting applications in future. A summary of future research challenges is presented at the end.
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ULLAH, ANEES. "Dependable System Design for Reconfigurable Safety-Critical Applications". Doctoral thesis, Politecnico di Torino, 2015. http://hdl.handle.net/11583/2592708.
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Scaling of transistor's channel length is entering the realm of atomic and molecular geometries making possible the design of powerful miniature sized computing device and enabling their omnipresence in every aspect of human life including safety-critical applications, for example, automotive, space and avionics and bio-medicine. However, these scaled nanoelectronic systems are increasingly vulnerable to transients and permanent faults posing severe threat to life and expensive equipment. Therefore, safety-critical applications should consider dependability from design, implementation, layout, fabrication to in-field operations. The evaluation of dependability of such systems is equally important.
State-of-the-art SRAM-based FPGAs are interesting devices because they are not only the early adopters of latest technology nodes making them vulnerable to all sorts of nanoelectronic faults but their reconfiguration properties have potential counter-measure applications in dependable system design. This dissertation is focused on the usage of reconfiguration for improving and evaluating the dependability of nanoelectronic systems. The main research problem pursued in this work is the effective mitigation of soft errors like Single Event Upsets (SEUs) and Multiple Bit Upsets (MBUs) in FPGA's configuration memory, optimizing the reconfiguration times for fault injection and fault removal and emulation of permanent faults.
To address these problems this work proposes solutions based on applying redundancy and reconfiguration at different levels of granularity leveraging the basic building blocks of FPGA's architecture and reconfiguration capabilities in an unconventional manner usually not supported by standard tools. The solutions presented effectively mitigate MBUs by using techniques of fine-grain and coarse-grain redundancy and reliability-oriented placement. Recovery times are optimized with fine-grain error detection, error localization and local repairing. The usage of carry-chain based error detectors promises very fast error detection times in orders of nanoseconds and has extremely low-area overhead. The programmable nature of LUTs is exploited for permanent stuck-at fault emulation of custom ICs using controlled LUT-mapping resulting in significant speed up against traditional fault simulation times.
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MALINVERNO, MARCO. "Safety Applications and Measurement Tools for Connected Vehicles". Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2895395.
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Lin, Chien-Chang, i 林建璋. "Application of Fuzzy Multicriteria Approach to Evaluating Traffic Safety Publicity Strategies". Thesis, 2003. http://ndltd.ncl.edu.tw/handle/39870931629836816708.
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碩士華梵大學
工業管理學系碩士班
91
Traffic problem has always been a very important indicator for the government administration, moreover, to improve traffic safety has been the most urgent subject that the government would like to breakthrough for all these years. In the past, the traffic safety publicity are mostly done by educational training, and assisted by the related literary slogan; hopefully through the function of educational propaganda, to change the behavior of the road user. However, for the past years, traffic safety problems were not effectively solved even under the promotion of traffic safety program; rather, under the development of traffic technology, and the increase in the number of vehicles, traffic condition has become even more congested and confusing. In the recent ten years, the traffic safety publicity strategy executed by the government is mostly propagated by mass media, literary slogan, and traffic safety education, which did not have such a major effect on improving traffic safety. When government is propagating traffic safety, doesn’t it want to use the method of publicity to lead road users to voluntary obey the traffic regulations? After all, what exactly is the kind of traffic safety publicity that will be more acceptable by the road users, in order to have more noticeable effect? All these are the main objectives of this research. For the sake to evaluate traffic safety publicity strategy, this research has proposed the fuzzy multicriteria evaluation method. To first of all, retrospect the related literature in the current traffic safety publicity strategy domestically, traffic safety, and strategic evaluation method, in order to generate the feasible strategy and evaluation criteria. This research would investigate and analyze the need, and the level of recognition that the road users has for traffic safety publicity strategy, as well as the related research of the past. The research has come up with eleven traffic safety publicity strategies. For the sake of understanding the feasibility during the execution of the drafted traffic safety publicity strategy, this research has generated eight evaluation criteria from the standpoints of marketing, through expert questionnaire method, to measure the evaluation criteria weight and the performance achievement value of the traffic safety publicity strategy for the eight evaluation criteria respectively. Then, by use of the proposed multicriteria evaluation method, to analyze the degree of feasibility in the execution of the traffic safety publicity strategies, and to list out their priority ranking. According to the result, “to appropriately insert the traffic safety knowledge during broadcast of traffic condition” has the highest priority. The second would be “to list ‘traffic safety education’ as the school requirement.” What was deemed as the least important by the expert would be the “phone service that take is public opinion”, which ranks as the last.
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Shen, Min-Chieh, i 沈旻頡. "Application of Fuzzy Inference to Safety Assessment and Management for Photovoltaic Manufacturing Plant". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/81291305775319039134.
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碩士國立高雄應用科技大學
土木工程與防災科技研究所
102
Optoelectronics industry in China's manufacturing output is among the highest in the world star industry , and the light plant is highly dangerous workplaces, in many workplace hazards lurk job , accident damage caused by a series of sources of industrial safety accident often cause damage and loss of property of a company operating life of physical labor . Fire, explosion, plant safety is the most serious potential threat to the safety management is the constant pursuit of generations update , upgrade the industrial economy, high-tech companies and research topics worthy of care , high-tech plant and processes have the potential fire hazard , use a lot of the manufacturing process flammable, combustible gas and liquid chemicals , are likely due to management negligence or improper operation, resulting in a major accident plant . This study assessed the possible security risk for the plant , the actual birth of various uncertain factors , fuzzy inference methods , risk assessment , and the further development of control strategies at all levels to achieve risk reduction goals hazards . The main factor considered in this study , including human factors , mechanical factors, management factors, environmental factors , and other four influencing factors for each factor and each contains several sub- layers factors . Each factor is basically divided into ten levels , the use of simple ladder membership function , then a reasonable fuzzy rule base , fuzzy inference. In this study, the existing software tool MATLAB Fuzzy Logic Toolbox explore the instances of high-tech plant management cases to verify the effectiveness of the implementation of the discussion , the results of the survey said reasonably . The risk assessment process is expected to further explore the risk factors other high-tech plant safety and allow effective implementation of the safety management of high-tech plant , to be more show in disaster work .
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Huang, Chun-Wei, i 黃俊維. "Application of Fuzzy Inference Method and Fuzzy Analytical Hierarchical Process to Risk Assessment of Home Fire Safety for Military Dependent Dormitory". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/33863075219201063808.
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碩士國立高雄應用科技大學
土木工程與防災科技研究所
101
In recent years, the “old apartment buildings” which are a large number of domestic residential constructions are resulting from deterioration of performance due to parts of the facilities may be “a poor” or "physical deterioration" after many years. Furthermore, because of the standard of living improved and regulations changed lead to the lack of function of existing facilities, fire often occurs due to the inner construction decoration and the lack of fire safety equipment, old electricity or overloaded, old pipeline, set behind bars, narrow roadway, illegally built stamped, escape ladders accumulation of debris, etc., are existing to increase the problems of residential fire hazard, and often causing the fire which cannot be extinguished immediately and casualties which is the main factor, also is the main reason for fire spreading largely. This study is proposed to investigate the risk assessment of home fire safety for apartment-style residential with unclear real factors by fuzzy inference methods to run the risk assessment, and further develop risk controlled methods to achieve the goal of reducing the harm of fire. Starting by considering totally 9 major categories and 27 influence factors of the apartment-style residential home fire safety assessment from the website of the Ministry of Interior Affairs and the professional advice from the fire stations, and then the weighting of each influence factor is decided by FAHP from experts; further, the data of possible degree of risk can be evaluated by CMC staffs in site based on FAHP. Then MATLAB fuzzy inference toolbox is employed to evaluate the degree of risk based on membership functions of each inputs and outputs (difference levels of influence factors) and inference rule banks. Finally, we can develop risk controlled methods be employed to make decision to reduce the fire accident. Two actual cases of military dependent dormitory located in Kaohsiung, termed A and B, are investigated and the results of evaluation are reasonable. We found that the risk of dormitory B is lower than that of dormitory A and the resons were analyzed. This process of risk assessment can be extended to discuss the high influence factors of different types of high-rise building, and discover the better solutions for fire prevention.
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Wu, Jian-Hung, i 吳建宏. "Application of Fuzzy Decision on The Safety Warming System of Bridges during Floods－for Xin-Hai Bridge". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/57560116537976213314.
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碩士中原大學
土木工程研究所
97
In these years, it is misgiving about the collapse of bridges during typhoon period in Taiwan. It becomes more significant to develop a systematic model of integrated performance for the safety warming system of bridges during floods. Xin-hai Bridge is employed for the practical case study. The invading typhoon data in 1996 to 2007 is collected. At first, a water level forecasting system was developed to estimate Xin-hai bridge water level for two-steps ahead by using adaptive neuro-fuzzy inference system. Next, Fuzzy Decision Analysis is used to be the assessment of the degree of safety bridges by three factors herein. Finally, make the standard operating procedure of safety warming system of Xin-hai Bridge. It is recommended that this study can be used for safety warming system of bridges in the future.
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Chi, Ming-Chou, i 紀銘周. "Application of Fuzzy Set Theory on Evalation of Durability of Offshore RC Structure & Safety of RC,PC Highway Bridges". Thesis, 1994. http://ndltd.ncl.edu.tw/handle/28826818835558006752.
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LIANG, JIN-SHU, i 梁金樹. "Evaluating system safety using fuzzy concepts". Thesis, 1991. http://ndltd.ncl.edu.tw/handle/14625900567283420427.
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Chen, Po-Kai, i 陳柏愷. "Fuzzy RFID Information Processing in Home Safety". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/33307115553996376269.
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碩士淡江大學
資訊工程學系碩士班
98
Radio Frequency Identification (RFID) becomes a popular research topic in recent years, because the cost has been reduced. The government actively promoted, and the industry started to do research and develop. RFID can be applied to many areas like Easy Card, ETC, access control cards, tickets, electronic health records, logistics and warehouse, chip of anti theft, tracking and identification. We aim at enhancing home safety in our research that provides a service to issue dangerous alarms at home. We use the RFID technology to detect possible dangerous objects and locations for the elderly and children at home. First, we deploy active tags in dangerous locations and attach them to objects. The reader detects the signal strength, namely RSSI values, from the tags. We use wireless network to deliver the RSSI values to the computer. Finally, the computer processes the data and performs fuzzy inference. The fuzzy inference includes both locations and objects. There are three membership functions based ages and RSSI values (location tags and object tags). The inference can result in a dangerous degree. If the dangerous degree is over the threshold, the computer will issue an alarm. We also propose a feedback mechanism to revise the membership functions for personalization, and it is applied to both location and object membership functions. We simulated a few situations for both children and the elderly. At first, we did not give any feedback. The system issued alarms as expected. Then we gave the system a few times of feedbacks to simulate no-danger situations. After a few feedbacks, the membership functions were adjusted to an extent that the alarm was not issued any more for the same situation. RFID is cheaper than cameras and the privacy issue can be avoided.
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Fan, Ming Wen, i 范銘文. "Automatically Fuzzy Rule Generation for Driving Safety Analysis". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/v8u4cr.
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碩士長庚大學
電機工程學研究所
96
This thesis proposes an intelligent system which analyzes driving safety. The system infrastructure is utilized two fixed cameras on the host vehicle. One is used to capture driver’s image in order to analyze driver's viewing direction, and the other is used to capture road image ahead for analyzing the lane direction and vehicle location if any. For driver's image, we utilize particle filter algorithm to track driver's face and then use Ada-Boost algorithm to get the positions of eyes. The position of the nose is found by Anthropometric face models and then the driver's viewing direction is obtained. For road image, the distance of forward car is calculated to achieve the goal of collision avoidance. The last step is to take information above into our system that be trained by generating fuzzy rules automatically to infer if it’s safe driving. The correction rate of the driving safety analysis is about 94.5% under various driving pattern. This implies that the proposed system can achieve the expected goal for real environment.
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Tseng, Pin-K''ai, i 曾彬凱. "the Study of Fuzzy Assessment in the Bridge Safety". Thesis, 1994. http://ndltd.ncl.edu.tw/handle/51373902260375165005.
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碩士國立臺灣大學
土木工程研究所
82
The conservation of bridge is neglected in the past, because it needs lots of manpower and money to build an observation system. So, the safety degree of bridge is in an unknown situation. It is dangerous with the testing of earthquake or flood. To improve such kind of dangerous situation, we must take weigh- ting assessment of bridge with economical consoideration. And the weighting of assessed item is needed to be corrected. The weighting is made by very few assessment expert in the past. We do not known the correctivity. So, we build a more correct weighting by the fuzzy method in this study. By the help of com- puter ,we can deal with the assessment of lots amount of high- way bridge in an economical way, and we can prove the correctiv- ity of fuzzy weighting in the comparison with man-made weighting.
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Zhu, Jesus Ching-sung, i 朱璟松. "Fuzzy Safety Assessment of Fire Hazard Risk of Hospital". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/05824367381939872184.
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碩士國立高雄應用科技大學
土木工程與防災科技研究所
95
Hospitals are provided for curing people and become important disaster rescue centers when giant hazards occur. It’s difficult for fire rescue in hospitals due to the special features such as the existence of weak patients. The current fire disaster prevention specifications, Standards for Installations of Fire Safety Equipments Based on Use and Occupancy (SIFSEBUO), are not adequately applied for hospitals. Further, the study of fire safety assessment of hospitals cannot be accurately quantified due to the presence of linguistic variables. This thesis is aimed to propose a systematic approach for safety assessment of fire hazard risk of hospitals based of fuzzy logic and fuzzy inference. First, background study, historic review and expert interview are adopted to obtain the important fire hazard factors. Then, membership functions and rule banks are built up. The scope is limited to a single fire prevention division (FPD) of a local hospital. The fuzzy assessment from life injury, economic loss, fire hazard results, fire occurrence probability to fire hazard risk will be studied in a system way. The proposed rule-based method for fuzzy safety assessment of fire hazard risk is applied to the Ward, OPD, OR of three local hospitals in Ping-Tong City of Taiwan and the results are compared with the method proposed by other researcher and Fire Training and Practice. This research has confirmed that fuzzy logic and fuzzy inference has been successfully applied to safety assessment of fire hazard risk of single fire prevention division of local hospitals.
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Neng, Feng Tseng, i 曾能芳. "Fuzzy Random Variables and Its Applications in Fuzzy Regression Model". Thesis, 2002. http://ndltd.ncl.edu.tw/handle/43098559339738094577.
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博士國立政治大學
統計學系
90
Conventional study on the regression analysis is based on the conception that the uncertainty of observed data comes from the random property. However, in this paper we consider both of the random property and the fuzzy perception to construct the regression model by using of fuzzy random variables. For the fuzzy sample , we will process the parameters estimation of the fuzzy regression, and we call this process as fuzzy regression analysis. The parameters estimation for a fuzzy regression model is generally derived by the linear programming scheme. But it’s result usually doesn’t sufficiently reflect the characteristics of the observed samples. Hence in this paper we propose an alternative technique for parameters estimation in constructing the fuzzy regression model. The result will describe the observed data better than the conventional method did, moreover it will have the fuzzy unbiased properties. For the purpose of fuzzy perception on the fuzzy random variables, we also give definitions for certain important fuzzy statistics such as fuzzy expected value, fuzzy variance and fuzzy median. Finally, we give an example about the Taiwan Business Cycle and the Taiwan Economic Growth Rate for illustration.
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Yu-Chiang, Hung. "Fuzzy Relational Databases and Its Applications". 2002. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0009-0112200611292342.
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Chiu, Hao-Jan, i 邱浩然. "Evolutioanry Neuro-Fuzzy Modeling and Applications". Thesis, 1998. http://ndltd.ncl.edu.tw/handle/83543257068624994052.
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碩士國立交通大學
資訊科學學系
86
Neuro-fuzzy systems are powerful hybridized systems withinthe domains of arti-ficial neural networks (ANNs) and fuzzy inference systems. Identifying a neur-o-fuzzy system is a relevant issue having received extensive attention. Model-ing a neuro-fuzzy system requires two steps: structure identification and par-ameter identification. The former identifies the rough structure of a system, and the latter fine-tunes detail parameters of the system. Conventional appro-aches to identify a system have their constraints. In order to overcome those limitations, several intelligence systems have been applied in this thesis. Inthis thesis, we propose an evolutionary model that fulfills the two phases id-entifying a system: simultaneoulsy identifying the structure and the paramete-rs. The proposed model facilitates the construction of a neuro-fuzzy system. This model provides an evolutionary approach to modify a neuro-fuzzy system o-ther than conventional ones.
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Chang, Shih-Da, i 張世達. "Fuzzy Logic System Analysis and Applications". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/53727799037537521001.
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Hung, Yu-Chiang, i 洪于強. "Fuzzy Relational Databases and Its Applications". Thesis, 2002. http://ndltd.ncl.edu.tw/handle/10756497461507225927.
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碩士元智大學
電機工程學系
90
In the real world, many information systems and applications must deal with imprecise or vague data. For such systems, fuzzy logic theory is well-known to provide a framework for modeling flexibility and handling vagueness in the interface between human conceptual categories and data, which is similar to the natural language. Such capabilities have been already developed in the database field, especially for handling flexible queries. In this thesis, we present the applications of fuzzy relational databases using similarity-based and possibility-based approaches to handle imprecise information. With two cases for XML documents retrieval and decision making, we propose a fuzzy XML query language, an extension of XML-QL called XML-FQL, for XML documents retrieval and apply flexible query based on the fuzzy measure approaches to realize the possibility retrieval. For the case of XML documents retrieval, the XML-FQL we proposed is a well-defined fuzzy query language for XML documents to handle some of element or attribute values that are more similar and allow the functions of flexible query to retrieve an ordered list by similarity. For the case of decision making, we have applied fuzzy theory to perform some flexible queries for merging many different opinions gathered from various experts’ questionnaires.