nÃo hà / Taking as premise the need to make retirement plans structured in Defined Benefit (DB) and Hybrid (combination of a Defined Benefit Plan and Defined Contribution) under Private Pension, more attractive to sponsors and thereby reduce the use of model Defined Contribution (DC) commonly adopted in Brazil, considered by many scholars in the field not interesting to participants of benefit plans due to not effectively meet the purpose of social security, is presented in this study a proposal for readjustment rule of benefits that can be adopted both in DB plans as well as in Hybrid, but that relies on DC plans logic. It is an intermediate readjustment rule between the ones commonly adopted in DB plans and DC plans. Through this new rule, the benefits readjustment will be based on investments cumulative profitability, ranging from 0 to 100% of inflation, with the possibility of recovering inflationary losses in situations which investment performance exceeds the actuarial target. In order to demonstrate the viability of the proposed readjustment rule, results of a simulation study using the Monte Carlo method are presented, comparing benefits readjustment based on inflation rate (100% inflation) and readjustment based on the new rule. Simulation results point to possible lower difference, in 60 years, around 10% of benefit net value calculated on the new rule. Although new ruleâs adoption could result in reduction of the net benefit when compared with inflation-based readjustment rule, it appears more advantageous to the participant when compared with readjustment rule practiced in DC plans because it does not admit application of negative annual readjustment on benefits. The proposed rule establishes a point of convergence for both participants and sponsors interests. The readjustment mechanism here proposed represents an innovation to the Brazilian Private Pension system. / Tomando como premissa a necessidade de tornar os planos de previdÃncia estruturados nas modalidades de BenefÃcios Definidos (BD) e de ContribuiÃÃo VariÃvel (CV) mais atrativos para os patrocinadores, no Ãmbito da PrevidÃncia Complementar, e assim reduzir o uso do modelo de ContribuiÃÃo Definida (CD) adotado no Brasil o qual à considerado por muitos estudiosos da Ãrea desinteressante para participantes de planos de benefÃcios por nÃo atender efetivamente a finalidade previdenciÃria, à apresentada neste estudo uma proposta de regra de reajuste de benefÃcios que pode ser adotada tanto em planos do tipo BD como tambÃm CV, mas que se apÃia na lÃgica prÃpria de planos CD. Trata-se de uma regra de reajuste intermediÃria entre a adotada em planos BD e a adotada em planos CD. Por essa nova regra o reajuste dos benefÃcios serà baseado na rentabilidade acumulada dos investimentos, devendo se situar entre 0 e 100% da inflaÃÃo, com possibilidade de recomposiÃÃo de perdas inflacionÃrias em situaÃÃes em que o desempenho dos investimentos supera a meta de atuarial. Com o objetivo de demonstrar a viabilidade do emprego da regra de reajuste proposta, apresentam-se os resultados de um estudo de simulaÃÃo utilizando o mÃtodo Monte Carlo, atravÃs do qual se faz um comparativo entre o reajuste com base nessa regra e o reajuste de benefÃcios com base em Ãndice de inflaÃÃo (100% da inflaÃÃo). Os resultados obtidos apontam para a possibilidade de ocorrÃncia de diferenÃa a menor, em 60 anos, da ordem de 10% no valor lÃquido do benefÃcio apurado com base na regra proposta. Embora a adoÃÃo da nova regra possa implicar essa reduÃÃo no valor lÃquido do benefÃcio quando comparada com a regra de reajuste com base na inflaÃÃo, no entanto, comparativamente à regra de reajuste praticada nos planos CD, esta apresenta-se mais vantajosa para o participante porque nÃo admite a aplicaÃÃo de reajustes anuais negativos sobre os benefÃcios. A regra proposta possibilita situar em um ponto de convergÃncia de interesses participantes e patrocinadores. Esse mecanismo de reajuste proposto representa uma inovaÃÃo para o sistema de previdÃncia complementar brasileiro.

Due to the combined impact of global population aging, increased life expectancy, fertility decline, and changing family structures, a growing segment of the population facing retirement is in danger of poverty and economic insecurity. As a result of their advanced age many elderly have lost their ability to earn an income, causing some to be penniless the rest of their lives. Therefore, the purpose of a government or a private run pension system is to provide a mechanism using financial tools to protect the entire structure for old age economic security. This paper not only introduces the philosophy and basic concept of a general pension system, but also examines a United States model, providing a closer look at a major developed industrial country’s national social security program, and corporate pension system. It also describes the experience of reforms on the development process of the United States retirement pension system. This paper studies the various corporate pension schemes in the United States and their possible application as models to countries such as Taiwan. In focusing on the United States corporate pension system in private sector, legal and economic issues are scrutinized. Theories which related to the pension system are first analyzed; then the definitions of the various retirement plans are given. The history of private pension schemes of the United States is told, starting with the American Express, then crude railroad retirement plans to the post-war demand to current United States retirement plans. Analysis of the changes in private sector's pension plan participation for defined benefits and defined contribution plans are examined in light of the impact these changes have made upon retirement income resources. Focus on the IBM Corporation is made as an example of a private sector business in the United States, and this study tracks the evolution of the company’s pension schemes from defined benefit pension plans to the newer hybrid cash balance pension plans and the now-popular defined contribution 401(k) pension plans. Findings show that the United States corporate pension system is not feasible as a model at this time because of its many deficiencies in its laws and regulations, and also because of the currently shaky global economy. Suggestions and possible remedies are given on how to strengthen the corporate retirement pension system in United States.

La planification temporelle constitue conceptuellement une partie du raisonnement temporelle et il appartient au domaine de recherche de l'intelligence artificielle. La planification temporelle peut être considérée comme une extension de la planification classique par les aspects temporels de l'action. La planification temporelle est généralement complété par des préférences ou des types différents decontraintes imposées à l'exécution des actiones. Il existe de nombreuses approches à ce problème. D'une part, il existe différents paradigmes pour la planification temporelle, par example: la planification par un recherche d'une solution optimale dans des graphes de planification (STRIPS), la planification via la satisfiabilité ou la planification pardes processus de Markov. Ces approches sont mutuellement incompatibles. D'autre part, la planification temporelle exige une sujet-spécification – comme il est défini d'une manière méthodologique. Selon cette situation, cette thèse vise à proposer une analyse approfondi de la planification avec des contraintes floues qui contient quelques remèdes à ces difficultés. À savoir, deux approches à la représentation et la modélisation de ces questions sont mises.Dans la première (chapitre 2, chapitre 3) - les relations floues d'Allen en tant que contraintes temporelles floues sont représentés par des normes de convolutions dans un espace de Banach des fonctions intégrables de Lebesgue. Cela nous permet de nous immergerles relations d'Allen dans les contextes computationnels de la planification temporelle (basée sur STRIPS et sur la procedure de Davis-Putnam) et d'élucider leur nature quantitative. Cette approche est développée dans un contexte des problèmes par systèmes multi-agents comme un sujet de cette approche. Dans les chapitres 4 et 5 les contraintes temporelles floues avec flou – introduit par préférences - sont représentées en termes logiques de la logique préférentielle de Halpern-Shoham. Cela nous permet d'adopter ces resultats dans une construction du contrôleur du plan. Cette approche est développée dans un contexte du problème du voyageur de commerce. Enfin, une tentative de réconcilier ces deux lignes de représentation des contraintes temporelles floues a été proposée dans le dernier chapitre. / Temporal planning forms conceptually a part of temporal reasoning and it belongs to research area of Artificial Intelligence and it may be seen as an extension of classical planning by temporal aspects of acting. Temporal planing is usually complemented by considering preferences or different types of temporal constraints imposed on execution of actions. There exist many approaches to this issue. One one hand, there are different paradigms to temporal planning, such as: planning via search in graphs (STRIPS), planning via satisfiability or planning in terms of Markov processes. These approaches are mutually incompatible. In addition, temporal planning requires a subject-specification as it is rather defined in a methodological way. On the other hand, temporal constraints are represented and modeled in different ways dependently on their quantitative or qualitative nature. In particular, Allen’s relations between temporal intervals – an important class of temporal constraints – do not have any quantitative aspects and cannot be considered in computational contexts. According to this situation, this PhD-thesis is aimed at the proposing a depth-analysis of temporal planning with fuzzy constraints which contains some remedies on these difficulties. Namely, two approaches to the representation and modeling of these issues are put forward. In the first one (chapter 2, chapter 3) – fuzzy Allen’s relations as fuzzy temporal constraints are represented by norms of convolutions in a Banach space of Lebesgue integrable functions. It allows us immerse Allen’s relations in the computational contexts of temporal planning (based on STRIPS and on DavisPutnam procedure) and to elucidate their quantitative nature. This approach is developed in a context of Multi-Agent Problem as a subject basis of this approach. In the second one (chapter 4, chapter 5) – fuzzy temporal constrains with fuzziness introduced by preferences are represented in a logical terms of Preferential Halpern-Shoham Logic. It allows us to adopt these result in a construction of the plan controller. This approach is developed in a context of Temporal Traveling Salesman Problem as a subject basis of this approach. Finally, an attempt to reconcile these two lines of representation of fuzzy temporal constraints was also proposed.