Un sistema de decisión multicriterio basado en riesgos: aplicación a la fase de ofertas

XXIV JORNADAS DE AUTOMÁTICA (24) (24.2003.LEÓN, ESPAÑA)Este trabajo presenta un sistema de soporte de decisión para proporcionar ayuda en la fase de ofertas, caracterizada por un alto nivel de incertidumbres. La preparación de la propuesta involucra un coste considerable, sumado a una gran movilización de recursos. En la práctica, usualmente las ofertas son evaluadas en base a diferentes criterios o parámetros de decisión. El algoritmo propuesto evalúa los distintos candidatos a propuesta según las distintas configuraciones de criterios. Se ha introducido una estructura basada en riesgos para minimizar una función objetivo que contiene las posibles acciones mitigadoras que pueden eliminar, parcial o totalmente, los daños causados por riesgos. Las acciones mitigadoras pueden tener una naturaleza discreta o continua

Optimal control of robotic systems with logical constraints: Application to UAV path planning

Abstract-Optimal control of robotic systems with logical constraints is an instance of a hybrid optimal control problem. It has been traditionally treated as a mixed-integer programming problem (MIP) which is of combinatorial complexity. This paper proposes a new approach for transforming logical constraints into inequality and equality constraints involving only continuous variables. In this way the hybrid optimal control problem is converted to a smooth optimal control problem that can in turn be solved using traditional nonlinear programming methods, thereby dramatically reducing the computational complexity of finding the solution. We illustrate the techniques by solving an optimal path planning problem for multiple unmanned aerial vehicles (UAVs) with collision avoidance. Simulation results are given to show the effectiveness of the approach

Controle preditivo multiobjetivo para processos com atraso

Tese (doutorado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia Elétrica.Esta tese apresenta contribuições para a melhoria da solução do controle de processos com atraso, através de estratégias de controle preditivo baseado no modelo (MPC) que incorporam aspectos como robustez, restrições e otimização multiobjetivo. As contribuições estão relacionadas à duas áreas: (i) controle de processos com atrasos dominantes e (ii) otimização multiobjetivo do controle. Para análise do efeito do atraso no comportamento do sistema em malha fechada, desenvolve-se uma nova formulação do controlador preditivo por matriz dinâmica (DMC), mostrando que este é composto por um controlador primário mais um preditor. Esta formulação permite avaliar analiticamente o efeito do atraso no DMC, comparado a outros controladores MPC, através de índices de robustez. Esta análise possibilita selecionar o algoritmo MPC mais adequado à implementação prática em processos com atraso, especialmente quanto à robustez do controle frente a variações paramétricas na planta. Do ponto de vista da otimização do controle, busca-se desenvolver estratégias de controle preditivo que consideram aspectos econômicos no projeto de controle, além das restrições técnicas e/ou operacionais que habitualmente constam nos requisitos de aplicações reais. As estratégias de controle propostas utilizam um nível supervisório para determinar as referências ótimas de controle para um nível regulatório. O nível supervisório baseia-se em um otimizador de múltiplos objetivos, projetado a partir de regras que integram heurística, lógica e dinâmica do processo por meio de expressões descritas através de lógica proposicional, ou por estruturação formulada através de regras de decisão. As soluções ótimas obtidas via otimização multiobjetivo funcionam como referências desejadas para o cálculo da lei de controle do algoritmo MPC. Diversas aplicações em plantas piloto e industriais ilustram os resultados obtidos com as diferentes estratégias desenvolvidas

INVESTIGATING THE PERCEPTION OF EXPATRIATES TOWARDS IMMIGRATION SERVICE QUALITY IN SHARJAH, UNITED ARAB EMIRATES THROUGH MIXED METHOD APPROACH

The public sectors in UAE are under immense pressure to demonstrate that their services are customer-focused and that continuous performance improvement is being delivered. The United Arab Emirates is a favoured destination for expatriates due to its own citizens form a minority of the population and are barely represented in the private sector workforce. These highly unusual demographics confer high importance on the national immigration services. Recently, increased interest in international migration, specifically within the United Arab Emirates, has been shown both by government agencies and by the governments of industrialised countries. Given the importance of the expatriate labour force to economic stability and growth in the Emirates, this research investigates how immigration services are perceived, with the aim of contributing to their improvement, thus ultimately supporting economic growth. It proposes a service quality perception framework to improve understanding within SID of how to raise levels of service delivered to migrants and other persons directly or indirectly affected by SID services. Qualitative data were collected by means of semi-structured interviews and quantitative data by means of a questionnaire survey based on the abovementioned framework. The survey data, on the variables influencing participants’ experiences and perceptions of SID services, were subjected to statistical analysis. The framework was then used to evaluate quality of service in terms of general impressions, delivery, location, response, SID culture and behaviour. Numerical data were analysed using inferential and descriptive statistics. It was found that service quality positively influenced service behaviour and that this relationship was mediated by SID culture. This research makes an original contribution to knowledge as one of the few studies of immigration to the United Arab Emirates. By examining the workings of one immigration department, it adds to the literature on immigration departments and organisational development in developing countries. It illuminates the mechanics of immigration services and demonstrates their increasing importance to the world economy

Formal verification and dynamic validation of logic-based control systems

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1998.Includes bibliographical references (p. 249-257).by Taeshin Park.Ph.D