Thesis (Ph. D.)--West Virginia University, 1998. / Title from document title page. Document formatted into pages; contains xvii, 90 p. : ill. Vita. Includes abstract.

Thesis (Ph. D.)--University of Missouri-Columbia, 1998. / Typescript. Vita. Includes bibliographical references (leaves 118-126). Also available on the Internet.

Thesis (Ph. D.)--University of Missouri-Columbia, 1998. / Typescript. Vita. Includes bibliographical references (leaves 118-126). Also available on the Internet.

Thesis (M.S.)--Rochester Institute of Technology, 1994 / Typescript. Bibliography: leaves 133-135.

Thesis (MTech (Chemical Engineering)) -- Cape Peninsula University of Technology, 2009. / Includes bibliographical references (leaves 81-83). Also available online.

Thesis (Ph. D.)--Florida State University, 2005. / Advisor: Dr. Makola M. Abdullah, FAMU-FSU College of Engineering, Dept. of Civil and Environmental Engineering. Title and description from dissertation home page (viewed Sept. 15, 2005). Document formatted into pages; contains xl, 414 pages. Includes bibliographical references.

Thesis (M. Sc. (Mathematics))--Rhodes University, 2006. / A thesis submitted in partial fulfilment of the requirements for the degree of Master of Science in Mathematics.

Made available in DSpace on 2014-06-11T19:30:50Z (GMT). No. of bitstreams: 0 Previous issue date: 2013-06-28Bitstream added on 2014-06-13T21:01:22Z : No. of bitstreams: 1 araujo_nvs_dr_ilha.pdf: 898369 bytes, checksum: 972b4fcee45e49e9c9a251e6404dedde (MD5) / Nos últimos anos têm-se percebido um forte crescimento no uso da tecnologia sem fio 802.11 (Wireless Local Area Network - WLAN) e os mecanismos de segurança implementados pelas emendas IEEE 802.11i e IEEE 802.11w têm se mostrado pouco eficazes no combate a ataques contra a disponibilidade dos serviços da WLAN. Os sistemas detectores de intrusão surgem como uma forma de auxiliar as redes de computadores neste combate contra a indisponibilização dos serviços. Nesta tese é proposto um modelo de detecção de intrusos chamado Kappa-PSO-ARTMAP Fuzzy, onde primeiramente a base de dados original é pré-processada, por meio de uma técnica de seleção de atributos baseada em rede neural ARTMAP Fuzzy e coeficiente Kappa, para reduzir a quantidade de atributos, deixando apenas as características mais representativas. A seguir, aplica-se a técnica de otimização por enxame de partículas (particle optimization swarm – PSO) na seleção de um conjunto de critérios (parâmetro de escolha, parâmetro de vigilância do módulo ARTa, taxa de treinamento e acréscimo do parâmetro de vigilância do módulo ARTa) empregados no treinamento do classificador de ataques, de forma a maximizar a identificação correta de amostras classificadas. O algoritmo de detecção de intrusos empregado no classificador de ataques é a rede neural ARTMAP Fuzzy. O desempenho desta nova estratégia é avaliado sobre três bases de dados coletadas respectivamente de uma rede simulada cabeada, uma rede infraestruturada sem fio com criptografia WEP (Wired Equivalent Privacy) e WPA (WiFi Protected Access) habilitadas e uma rede infraestruturada sem fio com criptografia WPA2 (WiFi Protected Access version 2) habilitada. Os resultados obtidos na avaliação da metodologia Kappa-PSO-ARTMAP Fuzzy demonstram a diminuição... / In the last years have seen a strong increase in the 802.11 wireless local area network (WLAN) technologies use, and the security mechanisms implemented by amendments IEEE 802.11i and IEEE 802.11w have proven not very effective in combating attacks against availability of WLAN services. Intrusion detection systems emerge as a way to help computer networks in this combat against the deny of services. In this thesis it's proposed a model of intrusion detection called Kappa-PSO-Fuzzy ARTMAP, where initially the original database is pre-processed through a feature selection technique based on ARTMAP Fuzzy neural network and Kappa coefficient for reduce the amount of attributes, leaving only the most representative features. Then, apply the particle swarm optimization (PSO) technique in searching a set of criteria (choice parameter, ARTa module vigilance parameter, training rate and increase in the ARTa module vigilance paramater) employees in training attacks classifier, in order to maximize the accurate identification of classified samples. The intrusion detection algorithm used in the attacks classifier is the ARTMAP Fuzzy neural network. The performance of this new strategy is evaluated over three colleted databases respectively in a simulated wired network, infrastructured wireless network with WEP (Wired Equivalent Privacy) and WPA (WiFi Protected Access) encryption enabled and infrastructured wireless network with WPA2 (WiFi Protected Access version 2) encryption enabled. The obtained results in the Kappa-PSO-ARTMAP Fuzzy methodology demonstrate the IDS computational cost reduction without causing... (Complete abstract click electronic access below)

Thesis (MTech (Chemical Engineering))--Cape Peninsula University of Technology, 2009. / Neuro-fuzzy computing techniques have been approached and evaluated in areas of process control; researchers have recently begun to evaluate its potential in pattern recognition. Multi-component ion exchange is a non-linear process, which is difficult to model and simulate as there are many factors influencing the chemical process which are not well understood. In the past, empirical isotherm equations were used but there were definite shortcomings resulting in unreliable simulations. In this work, the use of artificial intelligence has therefore been researched to test the effectiveness in simulating ion exchange processes. The branch of artificial intelligence used was the adaptive neuro fuzzy inference system. The objective of this research was to develop a neuro-fuzzy software package to simulate ion exchange processes. The first step towards building this system was to collect data from laboratory scale ion exchange experiments. Different combinations of inputs (e.g. solution concentration, resin loading, impeller speed), were tested to determine whether it was necessary to monitor all available parameters. The software was developed in MSEXCEL where tools like SOLVER could be utilised whilst the code was written in Visual Basic. In order to compare the neuro-fuzzy simulations to previously used empirical methods, the Fritz and Schluender isotherm was used to model and simulate the same data. The results have shown that both methods were adequate but the neuro-fuzzyapproach was the more appropriate method. After completion of this study, it could be concluded that a neuro-fuzzy system does not always have the ability to describe ion exchange processes adequately.

Orientador: Fernando Antonio Campos Gomide / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação / Made available in DSpace on 2018-08-07T11:13:01Z (GMT). No. of bitstreams: 1 Gonzaga_CynthiaSamaradeMedeiros_M.pdf: 6002445 bytes, checksum: ea520ecbc837e9454f7c845b857e88b9 (MD5) Previous issue date: 2006 / Resumo: Agentes computacionais têm um papel importante no comércio eletrônico, pois permitem um melhor aproveitamento de negociações e aumentam o grau de automação do mercado eletrônico. Agentes podem interagir entre si para atingir seus objetivos. Leilões fornecem mecanismos simples de interação e negociação entre agentes e, com o advento da Internet, estão se tomando um veículo eficaz para a realização de negociações eletrônicas intermediadas por agentes. Destaca-se nesse contexto o desenvolvimento de agentes para atuar em leilões eletrônicos simultâneos heterogêneos com bens inter-relacionados. Participar de múltiplos leilões simultaneamente traz a vantagem de permitir, por exemplo, que um agente possa monitorar preços de vários leilões e realizar o negócio naquele que se mostrar mais lucrativo. Além disso, muitas vezes a compra de bens individuais pode não fazer sentido. É o caso, por exemplo, de passagens aéreas e diárias de hotel em agências de viagem; a compra de um bem só se justifica diante da presença do outro. Com o intuito de promover e encorajar pesquisas na área de agentes atuando em leilões eletrônicos simultâneos heterogêneos com bens interrelacionados criou-se uma competição, o Trading Agent Competition-Classic (TAC-Classic). O TACClassic simula uma agência de viagem onde os agentes (participantes da competição) têm o objetivo de propor pacotes de viagem. Os bens são negociados em leilões simultâneos heterogêneos. Esta dissertação versa sobre o agente e-Agent, um dos finalistas do TAC-Classic 2005. O e-Agent utiliza técnicas de inteligência computacional em seus algoritmos de tomada de decisão. A determinação dos bens a serem comprados é realizada através de um modelo de programação linear inteira. A determinação dos valores dos lances a serem realizados é baseada em um método de previsão que determina a tendência dos valores em uma série temporal, um sistema baseado em regras fuzzy do tipo Takagi-Sugeno otimizado via um algo ritmo genético e procedimentos heurísticos. A arquitetura, as estratégias de decisão e a participação do e-Agent na competição são detalhadas e discutidas nesta dissertação / Abstract: Software agents play an important role in the electronic commerce because they allow negotiation and increase the degree of automation. To reach theil< goals, agents interact to communicate, negotiate and decide. Auctions provide a means for interaction and decision of agents especially within the Internet environment. In this context, development of agents to act in electronic simultaneous heterogeneous auctions with inter-related goods is a major issue. It is convenient for an agent to monitor multiple auctions because it increases chances and opportunities to do better deals. For example, it can compare multiple auctions prices in real time and make a bid for the cheapest one. Moreover, often it may not be meaningful to buy individual goods. This is, for example, the case of airline ticket and hotel reservation in many traveI agencies; here to buy of one good may only is justified with the presence other. To promote and encourage high quality research in the area of agents acting in electronic simultaneous heterogeneous auctions with inter-related goods, a market game, namely the Trading Agent Competition-Classic (TAC-Classic), was created. The TAC-Classic simulates a traveI agency scenario where .agents (entrants to the competition) have the goal of assembling traveI packages for their customers. The goods are traded in simultaneous heterogeneous auctions. This dissertation introduces e-Agent agent, a finalist in TAC-Classic 2005. The e-Agent uses decision-making mechanisms based on computational intelligence techniques and integer linear programming to determine the goods to be purchased. Before deciding on bid values, the agent uses a Takagi-Sugeno prediction model optimized by a genetic algorithm and heuristic procedures to compute tendencies of time series. The dissertation details the e-Agent architecture, its decision-making strategies, and reports on its performance during TAC-Classic 2005 / Mestrado / Engenharia de Computação / Mestre em Engenharia Elétrica