This diploma thesis deals with description of methods and original on-line application for solving multicriteria evaluation of alternatives problems. Methods based on maximisation of utility value (WSA), minimisation of distance from ideal alternative (TOPSIS), evaluation of preference relations (ELECTRE) and evaluation along preference flows (PROMETHEE) are described and implemented in the application. The thesis introduces an original web application written in PHP language which is developed for solving multicriteria evaluation of alternatives problems in internet environment. The application running on web-server allows solving multicriteria evaluation of alternatives problems by four above mentioned methods. The application is controlled by any web browser. A run-time complexity of used algorithms is measured and discussed.

O objetivo deste estudo foi comparar modelos importantes de classificações de risco em barragens (Índice Global de Risco Modificado, USACE, COGERH e Resolução CNRH n° 143), empregados por instituições no Brasil e no Mundo, na forma padrão e utilizando adaptações para o método multicritério ELECTRE TRI. Propôs-se também um método que atendesse às especificidades do ELECTRE TRI com apoio de um decisor com conhecimento técnico em segurança de barragens. Essas classificações foram aplicadas nas barragens dos projetos de irrigação Rio Formoso e Manuel Alves sob gestão da SEPLAN - TO. Levantaram-se informações técnicas por meio de projetos executivos e visitas técnicas nas construções para a realização do enquadramento das barragens nas classificações, tanto para os métodos já existentes, como para o método proposto pelo estudo que utilizou especificamente o ELECTRE TRI. Para a barragem do projeto Rio Manuel Alves a classificação foi de Baixo Risco. As barragens do Projeto Rio Formoso apresentaram classificações de Alto Risco e Risco Extremo. / The objective of this study was to compare important models of risk classifications in dams (Global Modified Risk Index, USACE, COGERH and Resolution CNRH n ° 143), employed by institutions in Brazil and in the world, in the standard form and using adaptations to the method Multicriteria ELECTRE TRI. It was also proposed a method that would meet the specificities of ELECTRE TRI with the support of a decision maker with technical knowledge on dam safety. These classifications were applied to the dams of the Rio Formoso and Manuel Alves irrigation projects under the management of SEPLAN - TO. Technical information was obtained through executive projects and technical visits to the constructions for the implementation of the classification of dams in the classifications, both for the existing methods and for the method proposed by the study that specifically used ELECTRE TRI. For the Rio Manuel Alves dam, the classification was Low Risk. The Rio Formoso Project dams presented High Risk and Extreme Risk ratings.

Submitted by Mariana Dornelles Vargas (marianadv) on 2015-03-17T19:40:51Z No. of bitstreams: 1 metodo_quantificar.pdf: 1038017 bytes, checksum: 54f78fa2753a1dfe9d797dc88d1ed31e (MD5) / Made available in DSpace on 2015-03-17T19:40:51Z (GMT). No. of bitstreams: 1 metodo_quantificar.pdf: 1038017 bytes, checksum: 54f78fa2753a1dfe9d797dc88d1ed31e (MD5) Previous issue date: 2011-03-16 / CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / PROSUP - Programa de Suporte à Pós-Gradução de Instituições de Ensino Particulares / Em ambientes produtivos intermitentes que operam na condição ?produzir para estoque?, com fluxo convergente, a possibilidade de constituir estoques em processo (WIP), de produtos prontos, ou matérias-primas pode aumentar o grau de complexidade da gestão das operações e a necessidade de utilizar procedimentos de controle distintos para cada tipo de estoque. Ao focar no alinhamento da gestão dos estoques aos planos de demanda e capacidade, considerando um ambiente produtivo que emprega a abordagem Conwip, a presente pesquisa tem por finalidade propor um método estruturado que possibilite quantificar o nível de WIP do sistema produtivo, a partir da Simulação por Eventos Discretos e da técnica de Apoio Multicritério ELECTRE TRI. Esta pesquisa tem o intuito de contribuir com a geração de informações que subsidiem a tomada de decisão concernente à escolha de uma configuração de cenário que aluda a um nível de estoque em processo e de produtos prontos considerando o mix de produção sob estudo. Fundamentado na proposta desenvolvida nesta dissertação, o Método de Pesquisa pode ser caracterizado quanto aos procedimentos técnicos, pelo uso da Simulação Computacional e relativo à natureza dos dados, destaca-se o da abordagem essencialmente quantitativa, ou Pesquisa Quantitativa. O método proposto foi avaliado, quanto a sua estrutura e proposta, por especialistas das disciplinas de Simulação, Gestão de Sistemas Produtivos e Métodos Multicritério à Decisão. Uma aplicação do método em um sistema produtivo real também é apresentada / In intermittent productive systems that operate in the condition 'make to stock' with convergent flow, the possibility of generate work in process (WIP), finish good products or raw materials inventories can increase the degree of complexity of the management in the operations and the need of using procedures of different control for each stock type. Focusing in the alignment of the stocks to the demand and capacity plans, considering a productive system which uses the Conwip approach, this research describes a structured method that aims to quantify the level of WIP in the productive system, applying the Events Discrete Simulation and the technique nominated ELECTRE TRI. This research intends to contribute with the generation of information for decision support regarding the choice of work in process and finished goods stock levels, considering the production mix studied. Based in the proposal developed in this work, the Method of Research can be characterized, regarding the technical procedures, as Computational Simulation, and regarding the nature of the data, as Quantitative Research. The method proposed in this research was evaluated for specialists in the disciplines of Simulation, Administration of Production Systems and Multicriteria Decision Analysis. An application of the method in a real productive system is also presented.

This thesis deals with infrastructure network vulnerability analysis in the natural disaster context. It starts from the observation that infrastructure such as water supply or power grid has significant influence on natural disasters’ indirect consequences. The aim is to model the vulnerability to take efficient actions. The scientific approach is divided into two complementary parts. The first one deals with the vulnerability assessment, while the second one focuses on the decision aiding process to be implemented for the assessed vulnerability reducing. The proper vulnerability analysis is based on the analysis objects modelling. In order to achieve this, we will adopt a graph theory representation. A literature review will allow us to identify the graph structure which best suits the context of the thesis. In a multi network analysis environment, interdependences, i.e. relationships between components of the same network or different networks - are a determining factor for any vulnerability model. We have thus proposed an approach to model interdependence compatible with the graph theory. There are two types of relationships: the one first is functional (dependence), while the second one is dysfunctional (influence). The vulnerability is assessed by a simulation-based approach. It is composed of one part relating to the system ability to resist the feared event; and the other part relative to its ability to be back on its nominal state after the disaster. When the vulnerability is determined, the next step will be to take the necessary decisions to manage it. This part on the decision aiding is itself divided into two sub parts: first of all the process to be used for the crisis management is established. Then a methodology for decision aiding is proposed and results on a Decision Support System development. In the age of the internet and social networks, it is possible to deploy the application on the internet.

The performance of the century-old irrigation system of Pakistan (i.e. warabandi) has been evaluated using socio-economic data gathered by the author in multiple farmers?? surveys (n=278) conducted in Indus Basin of Pakistan. In the surveyed regions, the warabandi system was performing poorly. In-built rigidity in water allocations was found as main reason behind its poor performance. The results from the farmers?? surveys also revealed that the objective of increasing irrigation water productivity would never be attained under the warabandi arrangements. Hence, a completely new concept that could replace the warabandi system and improve the productivity of limited irrigation water should be introduced. My aim was to find a better way to allocate the scarce water resource between farmers. In this study, I have introduced a new concept for determining water allocations among the farmers, which is based on a multicriterion decision making (MCDM) approach. The consideration of multiple criteria in irrigation water allocations would improve irrigation water productivity. Upon an extensive survey of well-known MCDM methods, I concluded that all previously existing MCDM methods were using subjective inputs, usually from a single modeller, to establish priorities of alternatives and therefore, a predetermined solution could easily be obtained. I have developed an approach based on conjoint analysis which removes that subjectivity from the chosen MCDM method (i.e. ELECTRE). Interval scales and relative importance criteria weights, two usually subjective inputs in ELECTRE, are objectively estimated from the conjoint analysis study. For that purpose, the author designed a conjoint questionnaire and administered it to 62 farmer respondents in face-to-face interviews. Conjoint analysis, which does not appear to have been previously used in water resources or allocation studies, is a method for creating the interval scales and the relative criteria weights objectively from the respondents?? judgements on the importance of conjoint objects. The objective estimation of these two important factors is a completely new development which can assist in the unbiased determination of the best division or allocation of scarce water resources between farmers. The approach is applied, as a demonstration, to a region with nine distributary watercourses to determine which of the distributaries should have the highest priority for allocation of the regional water.

Flexible approaches for eliciting preferences of decision makers involved in a conflict are developed along with applications to real-world disputes. More specifically, two multiple criteria decision making approaches are proposed for capturing the relative preferences of a decision maker participating in a conflict situation. A case study in logistics concerned with the conflict arising over the expansion of port facilities on the west coast of North America as well as a transportation negotiation dispute are used to illustrate how these approaches can be integrated with the Graph Model for Conflict Resolution, a practical conflict analysis methodology. Ascertaining the preferences of the decision makers taking part in a conflict constitutes a key element in the construction of a formal conflict model. In practice, the relative preferences, which reflect each decision maker’s objectives or goals in a given situation, are rather difficult to obtain. The first method for preference elicitation is to integrate an Analytic Hierarchy Process (AHP) preference ranking method with the Graph Model for Conflict Resolution. The AHP approach is used to elicit relative preferences of decision makers, and this preference information is then fed into a graph model for further stability analyses. The case study of the Canadian west coast port congestion conflict is investigated using this integrated model. Another approach is based on a fuzzy multiple criteria out-ranking technique called ELECTRE III. It is also employed for ranking states or possible scenarios in a conflict from most to least preferred, with ties allowed, by the decision maker according to his or her own value system. The model is applied to a transportation negotiation dispute between the two key parties consisting of shippers and carriers.

Flexible approaches for eliciting preferences of decision makers involved in a conflict are developed along with applications to real-world disputes. More specifically, two multiple criteria decision making approaches are proposed for capturing the relative preferences of a decision maker participating in a conflict situation. A case study in logistics concerned with the conflict arising over the expansion of port facilities on the west coast of North America as well as a transportation negotiation dispute are used to illustrate how these approaches can be integrated with the Graph Model for Conflict Resolution, a practical conflict analysis methodology. Ascertaining the preferences of the decision makers taking part in a conflict constitutes a key element in the construction of a formal conflict model. In practice, the relative preferences, which reflect each decision maker’s objectives or goals in a given situation, are rather difficult to obtain. The first method for preference elicitation is to integrate an Analytic Hierarchy Process (AHP) preference ranking method with the Graph Model for Conflict Resolution. The AHP approach is used to elicit relative preferences of decision makers, and this preference information is then fed into a graph model for further stability analyses. The case study of the Canadian west coast port congestion conflict is investigated using this integrated model. Another approach is based on a fuzzy multiple criteria out-ranking technique called ELECTRE III. It is also employed for ranking states or possible scenarios in a conflict from most to least preferred, with ties allowed, by the decision maker according to his or her own value system. The model is applied to a transportation negotiation dispute between the two key parties consisting of shippers and carriers.

The performance of the century-old irrigation system of Pakistan (i.e. warabandi) has been evaluated using socio-economic data gathered by the author in multiple farmers?? surveys (n=278) conducted in Indus Basin of Pakistan. In the surveyed regions, the warabandi system was performing poorly. In-built rigidity in water allocations was found as main reason behind its poor performance. The results from the farmers?? surveys also revealed that the objective of increasing irrigation water productivity would never be attained under the warabandi arrangements. Hence, a completely new concept that could replace the warabandi system and improve the productivity of limited irrigation water should be introduced. My aim was to find a better way to allocate the scarce water resource between farmers. In this study, I have introduced a new concept for determining water allocations among the farmers, which is based on a multicriterion decision making (MCDM) approach. The consideration of multiple criteria in irrigation water allocations would improve irrigation water productivity. Upon an extensive survey of well-known MCDM methods, I concluded that all previously existing MCDM methods were using subjective inputs, usually from a single modeller, to establish priorities of alternatives and therefore, a predetermined solution could easily be obtained. I have developed an approach based on conjoint analysis which removes that subjectivity from the chosen MCDM method (i.e. ELECTRE). Interval scales and relative importance criteria weights, two usually subjective inputs in ELECTRE, are objectively estimated from the conjoint analysis study. For that purpose, the author designed a conjoint questionnaire and administered it to 62 farmer respondents in face-to-face interviews. Conjoint analysis, which does not appear to have been previously used in water resources or allocation studies, is a method for creating the interval scales and the relative criteria weights objectively from the respondents?? judgements on the importance of conjoint objects. The objective estimation of these two important factors is a completely new development which can assist in the unbiased determination of the best division or allocation of scarce water resources between farmers. The approach is applied, as a demonstration, to a region with nine distributary watercourses to determine which of the distributaries should have the highest priority for allocation of the regional water.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-04-25T21:18:31Z No. of bitstreams: 1 LucasMartorelliGondimLuz_DISSERT.pdf: 1583842 bytes, checksum: df20ff101760de2e1c9cd23c387cd2ea (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-04-27T19:40:20Z (GMT) No. of bitstreams: 1 LucasMartorelliGondimLuz_DISSERT.pdf: 1583842 bytes, checksum: df20ff101760de2e1c9cd23c387cd2ea (MD5) / Made available in DSpace on 2016-04-27T19:40:20Z (GMT). No. of bitstreams: 1 LucasMartorelliGondimLuz_DISSERT.pdf: 1583842 bytes, checksum: df20ff101760de2e1c9cd23c387cd2ea (MD5) Previous issue date: 2014-09-15 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / Este trabalho apresenta uma aplica??o multicrit?rio h?brida Fuzzy-ELECTRETOPSIS para o problema de sele??o de Servi?os de Computa??o em Nuvem. A pesquisa foi de car?ter explorat?rio, utilizando de um Estudo de Caso, baseado nas exig?ncias reais de profissionais da ?rea de Computa??o em Nuvem. A obten??o dos resultados foi feita a partir da condu??o de Experimento alinhado ao Estudo de Caso, utilizando o perfil distinto de tr?s decisores, para tal, utilizou-se o m?todo Fuzzy-TOPSIS e Fuzzy-ELECTRETOPSIS para obten??o destes resultados e compara??o entre eles. A solu??o contempla a Teoria dos conjuntos Fuzzy, para assim poder suportar informa??es de car?ter impreciso ou subjetivo, facilitando assim a interpreta??o do julgamento do decisor no processo de tomada de decis?o. Os resultados obtidos mostram que ambos os m?todos foram capaz de classificar as alternativas existentes no problema da maneira esperada, por?m o m?todo Fuzzy-ELECTRE-TOPSIS foi capaz de atenuar o car?ter compensat?rio existente no m?todo Fuzzy-TOPSIS, resultando na ordena??o diferenciada das alternativas existentes no problema de decis?o. A atenua??o do car?ter compensat?rio destacou-se de maneira positiva dentro do problema abordado, pois valorizou alternativas mais balanceadas que o m?todo Fuzzy-TOPSIS, um fator que foi comprovado como importante na valida??o do estudo, visto que para composi??o de um mix de servi?o as alternativas mais balanceadas constituem um mix mais consistente ao se trabalhar com restri??es. / This work presents an application of a hybrid Fuzzy-ELECTRE-TOPSIS multicriteria approach for a Cloud Computing Service selection problem. The research was exploratory, using a case of study based on the actual requirements of professionals in the field of Cloud Computing. The results were obtained by conducting an experiment aligned with a Case of Study using the distinct profile of three decision makers, for that, we used the Fuzzy-TOPSIS and Fuzzy-ELECTRE-TOPSIS methods to obtain the results and compare them. The solution includes the Fuzzy sets theory, in a way it could support inaccurate or subjective information, thus facilitating the interpretation of the decision maker judgment in the decision-making process. The results show that both methods were able to rank the alternatives from the problem as expected, but the Fuzzy-ELECTRE-TOPSIS method was able to attenuate the compensatory character existing in the Fuzzy-TOPSIS method, resulting in a different alternative ranking. The attenuation of the compensatory character stood out in a positive way at ranking the alternatives, because it prioritized more balanced alternatives than the Fuzzy-TOPSIS method, a factor that has been proven as important at the validation of the Case of Study, since for the composition of a mix of services, balanced alternatives form a more consistent mix when working with restrictions.

Submitted by Pedro Barros (pedro.silvabarros@ufpe.br) on 2018-06-29T19:24:58Z No. of bitstreams: 2 license_rdf: 811 bytes, checksum: e39d27027a6cc9cb039ad269a5db8e34 (MD5) DISSERTAÇÃO Leydiana de Sousa Pereira.pdf: 2830471 bytes, checksum: 1c300530083f2d2b39ea6508f9b37c2d (MD5) / Made available in DSpace on 2018-06-29T19:24:58Z (GMT). No. of bitstreams: 2 license_rdf: 811 bytes, checksum: e39d27027a6cc9cb039ad269a5db8e34 (MD5) DISSERTAÇÃO Leydiana de Sousa Pereira.pdf: 2830471 bytes, checksum: 1c300530083f2d2b39ea6508f9b37c2d (MD5) Previous issue date: 2017-02-21 / CNPQ / As companhias de saneamento brasileiras apresentam problemas nos sistemas de abastecimento que além de impactar negativamente seu desempenho, provoca desperdício de água tratada, aumento nos custos operacionais, exploração demasiada dos mananciais e prejuízos à sociedade diante das interrupções no fornecimento ou em virtude dos vazamentos. Consequentemente, as companhias estão sofrendo fortes pressões econômicas, ambientais e sociais. Essa pesquisa objetiva auxiliar na tomada de decisão nesses sistemas, essencialmente os que utilizam fontes subterrâneas, quanto ao estabelecimento de prioridades gerenciais em termos das atividades de manutenção. Na fase de captação, é comum ocorrerem problemas nos poços repercutindo na interrupção da produção. Considerando que um sistema é composto por diversos poços, o conhecimento de quais unidades tem maior relevância torna-se uma importante informação. Assim, é proposto um modelo multicritério para ordenação dos poços baseado no método ELECTRE III. Além disso, em termos das redes de distribuição, é comum o registro simultâneo de vazamentos em diversos pontos do sistema. Dessa forma, para facilitar a gestão da manutenção é proposta a classificação da região de estudo em áreas por criticidade, a fim de reconhecer os setores que apresentam uma maior prioridade no atendimento. Para este caso, foi proposto um modelo para classificação das áreas críticas utilizando o método ELECTRE TRI. Os critérios para avaliação das alternativas empregados em cada processo decisório foram determinados pela abordagem SODA. Para ilustração da aplicação dos modelos, foram coletados os dados do município pernambucano da Ilha de Itamaracá, que além de ser um destaque turístico e cultural para o estado, possui um sistema de abastecimento exclusivamente provido de fontes subterrâneas e altas taxas de desperdício. Como resultado, foram estabelecidas a ordenação dos nove poços, bem como a classificação do município em onze áreas considerando seu impacto em termos de criticidade para a gestão da manutenção. Assim, percebe-se que estes dois modelos estão direcionados para a melhoria da eficiência dos serviços prestados pela companhia de saneamento, aliado a um maior bem estar da população. / The Brazilian sanitation companies have problems in their supply systems which impact in your performance, cause losses of treated water, increase in operating costs, excessive exploitation of water sources and waste to society due to interruptions in supply or leaks. As a result, companies have been suffering from severe economic, environmental and social pressures. This research aims to assist in decision making in these systems, mainly those that use underground sources, in establishing management priorities in terms of maintenance activities. In the catchment phase, it is common have problems in the wells that affect the production. Considering that a system consist of several wells, the knowledge of which units have the greatest relevance becomes important information. Thus, is proposed a multicriteria model for well ordering based on the ELECTRE III method. In addition, in terms of distribution networks, it is common to simultaneously record leaks at various points in the system. In this way, to facilitate the maintenance management, it is proposed to classify the study region in critical areas, in order to recognize the sectors that have a higher priority in service. For this case, a model was proposed for classification of critical areas using the ELECTRE TRI method. The criteria for evaluating the alternatives employed in each decision process were determined by the SODA approach. In order to illustrate the application of the models, data were collected from the city of Pernambuco, on the Ilha de Itamaracá, which besides being a touristic and cultural highlight for the state, has a supply system exclusively provided from underground sources and problems of waste. As a result, the ordering of the nine wells was established and the classification of the city in eleven areas considering its impact in terms of criticality for maintenance management. Thus, it can be seen that these two models are aimed at improving the efficiency of the services provided by the sanitation company, together with a greater well-being of the population.