Suchergebnisse

Decision making is all around us. Everyone makes choices everyday, from the moment we open our eyes in the morning. Some of them do not have very important consequences in our life and these consequences are easy to take into account. However, in the business world, managers make decisions that have important consequences on the future of their own firm (in terms of revenues, market position, business policy) and their employees. In these cases, it is difficult to account for all the possible alternatives and consequences and to quantify them. Decision making tools such as Decision Analysis are required in order to determine the optimal decision. Furthermore, when several competing agents are involved in a decision making situation and their combination of actions affect each other's revenues, the problem becomes even more complicated. The way an agent makes a decision and the tools required to determine the optimal decision change. When we are aware of someone observing and reacting to our behavior, one might occasionally prefer a sub-optimal choice aimed at causing confusion on the adversary, so that it will be more difficult for him to guess our decision in future encounters, which may report us a larger benefit. This situation arises in counter-terrorist combat, terrorism prevention, military domains, homeland security, computer games, intelligent training systems, economic adversarial domains, and more. In simple terms, we define an adversary as an entity whose aims are somehow inversely related to ours, and who may influence the profits we obtain from our decisions by taking his/her own actions. This kind of competitive interaction between two agents fits a variety of complex situations which can be analyzed with a number of techniques ranging from Knowledge Engineering and Artificial Intelligence (agent-based modeling, tree exploration, machine learning) to Operational Research, with an emphasis on Game Theory. The objective of this thesis is the analysis and design of adversarial decision and optimization-based models which are able to represent adversarial situations. We are going to conduct theoretical studies and propose practical applications including imitation games, security games and patrolling domains. More precisely, we first study a two-agent imitation game in which one of the agents does not know the motivation of the other, and tries to predict his decisions when repeatedly engaging in a conflict situation, by observing and annotating the past decisions. We propose randomized strategies for the agents and study their performance from a theoretical and empirical point of view. Several variants of this situation are analyzed. Then we move on to practical applications. We address the problem of extracting more useful information from observations of a randomized Markovian strategy that arises when solving a patrolling model, and propose a mathematical procedure based on fuzzy sets and fuzzy numbers for which we provide a ready-to-use implementation in an R package. Finally, we develop an application of adversarial reasoning to the problem of patrolling an area using an autonomous aerial vehicle to protect it against terrestrial intruders, and solve it using a mix of game-theoretic techniques and metaheuristics. ; Tesis Univ. Granada. Departamento de Ciencias de la Computación e Inteligencia Artificial ; Esta tesis ha sido financiada parcialmente por los proyectos P07-TIC-02970 y P11-TIC-8001 de la Junta de Andalucía, TIN2011-27696-C02-01 del Ministerio de Economía y Competitividad, GENIL-PYR-2014-9 del CEI-BioTIC (Universidad de Granada), TIN2008-01948 y TIN2008-06872-C04-04 del Ministerio de Ciencia e Innovación, y por la beca FPU referencia AP-2010-4738 del Ministerio de Educación.

AbstractHaving a satisfying sex life is important to older adults. Thus, this study aimed to provide information about the sexual satisfaction of older adults in a relationship, using the Interpersonal Exchange Model of Sexual Satisfaction (IEMSS) as a theoretical framework. Participants were 187 sexually active individuals (98 men and 89 women) in a romantic relationship (age 65–75 years). They were recruited using Amazon's Mechanical-Turk, and completed the Interpersonal Exchange Model of Sexual Satisfaction Questionnaire and two open-ended questions asking what they enjoyed most and least about their sexual relationship. On average, participants were highly sexually satisfied. In keeping with the IEMSS, greater sexual satisfaction was predicted by a more favourable balance of sexual rewards to costs, greater equality of sexual costs and higher satisfaction with the non-sexual aspects of the relationship. Four themes emerged regarding what participants liked most and least about their sexual relationship: emotional aspects of the relationship, physical aspects of the relationship, dyadic aspects of the relationship and age-related aspects of being sexual. None of the four themes were specific to men or women, although some gender/sex differences were found. The results paint a positive picture of the sexual relationships of older adults and support the utility of the IEMSS as a framework to understand sexual satisfaction in older adults.