Incremental derivation of abstraction relations for data refinements

Data refinements are refinement steps in which a program’s local data structures are changed. Data refinement proof obligations require the software designer to find an abstraction relation that relates the states of the original and new program. In this paper we describe an algorithm that helps a designer find an abstraction relation for a proposed refinement. Given sufficient time and space, the algorithm can find a minimal abstraction relation, and thus show that the refinement holds. As it executes, the algorithm displays mappings that cannot be in any abstraction relation. When the algorithm is not given sufficient resources to terminate, these mappings can help the designer find a suitable abstraction relation. The same algorithm can be used to test an abstraction relation supplied by the designer.

INTERNET COMO PLATAFORMA PARA LIVRE CIRCULAÇÃO DE INFORMAÇÃO DE RELEVÂNCIA SOCIAL E NOVAS POSSIBILIDADES DE COMUNICAÇÃO

O estudo aponta como a internet ampliou as possibilidades de comunicação dos cidadãos de uma forma que não era possível no período do controle e concentração dos meios broadcasting sobre a informação social, assim, oferecendo espaço para a livre circulação de informação e novas possibilidades de comunicação. Entretanto, ressalta que ainda há assimetrias tanto do ponto de vista do acesso quanto do uso da rede em todas as suas potencialidades. Verifica que o atual momento ainda é de disputas em relação à legislação que diz respeito aos direitos e deveres dos que utilizam a rede. O trabalho foi realizado por meio de pesquisa bibliográfica e documental, tendo com base autores que pesquisam sobre as áreas da Comunicação, Tecnologias Digitais, Direito à Informação Social Livre e Legislação de internet, como Cicília Peruzzo, Manuel Castells, Rousiley Maia, Sérgio Amadeu da Silveira, Tim Wu, Tim Berners-Lee, Walter Lima Junior, Wilson Gomes e Yochai Benkler. O resultado da pesquisa demonstra que no cenário brasileiro, as desigualdades socioeconômicas são fator de desigualdade tanto em relação ao acesso quanto aos usos da internet, sendo dificultador para quem desejar se apropriar com liberdade deste desenvolvimento tecnológico. Portanto, cabe ao setor público interferir com vistas à diminuição das assimetrias informativas para garantir o direito de comunicação dos brasileiros no espaço de comunicação digital conectada.

IDEOLOGIA DO TRABALHO NOS LIVROS DIDÁTICOS NA REPÚBLICA VELHA (1910-1930)

A partir de uma abordagem histórica, esta pesquisa apresenta como objetivo específico a análise da presença da ideologia do trabalho na sociedade brasileira e o modo como foi difundida nos livros didáticos no período de 1910 a 1930. O início do século XX foi marcado por grandes mudanças no Brasil. Nesta pesquisa, levaremos em conta apenas mudanças no Estado de São Paulo, que recebeu grande parte dos imigrantes europeus e concentrou muitas das indústrias brasileiras. Após a abolição da escravatura e da proclamação da República, o Brasil sofreu grandes transformações. O desenvolvimento da economia preocupava o Estado e a classe dominante, uma vez que não se encontravam indivíduos para a realização de trabalhos manuais. A sociedade ainda defendia a ideologia de que o trabalho manual era algo vergonhoso e de menos importância hierárquica. Foi então que os imigrantes foram contratados para exercer esse tipo de atividade. As péssimas condições de moradia, trabalho e participação política contribuíram para que os imigrantes reivindicassem seus direitos por meio de greves e manifestações. O governo não poderia permitir que os imigrantes com ideologias anarquistas disseminassem tais conceitos revolucionários e ideológicos no seio da massa operária e, consequentemente, na população. O Estado utilizou a educação para a inculcação de novas ideologias sobre a importância do trabalho, sustentando que o operário deveria cumprir suas obrigações dentro das indústrias sem questionar. Para tanto, era necessário que a escola adotasse algum tipo de material didático que difundisse ideologias a respeito do amor ao trabalho. Desde então, o livro didático foi utilizado como um forte transmissor destas ideologias: ele não foi usado como um simples material de apoio pedagógico, mas, sim, como um difusor de ideologias da classe dominante.

SUPORTE SOCIAL E AUTOEFICÁCIA EM IDOSOS

As questões do desenvolvimento humano desde tempos remotos são de interesse das diversas áreas do conhecimento. Tendo em vista o aumento da expectativa de vida, as questões relacionadas ao processo de envelhecimento ganharam importância, principalmente no que tange às políticas de saúde. A saúde é preocupação central no campo do envelhecimento, uma vez que problemas de saúde podem acarretar diversas dificuldades para os idosos e para suas famílias. Este estudo teve por objetivo buscar identificar as associações entre percepções de suporte social e autoeficácia em idosos. Suporte social e autoeficácia são variáveis estudadas em contextos diversos. Estudos revelam que ambas são capazes de colaborar para proteger e promover saúde. Suporte social diz respeito ao grupo de informações que leva o indivíduo a acreditar que é valorizado, amado e estimado e que o faz sentir-se pertencente a uma rede social de comunicação recíproca. Autoeficácia pode ser definida como o conjunto de crenças que o indivíduo tem sobre suas capacidades para organizar e executar ações para o cumprimento de tarefas específicas. Portanto, identificar a existência de associações entre as percepções de suporte social e autoeficácia pode contribuir para dar maior solidez aos conhecimentos já existentes sobre esses temas e sobre o processo de envelhecimento. Participaram do estudo 61 idosos de ambos os sexos, com idade média de 67 anos, com grau de escolaridade que variou entre ensino fundamental até pós-graduação e participantes em ações de promoção à saúde. Todos foram voluntários e autorizaram sua participação por meio da assinatura de termo de consentimento. A coleta de dados foi feita mediante a aplicação de questionário contendo escalas para avaliar os construtos, além de questões para caracterização dos participantes. Os dados foram analisados eletronicamente por meio do cálculo de frequências, percentuais, médias e desvios padrão. Para se testar a hipótese, foi calculada a correlação (r de Pearson) entre as variáveis do estudo. Entre os resultados obtidos, a percepção de suporte social, tanto na dimensão emocional quanto na dimensão prática, para os idosos participantes deste estudo, é de que muitas vezes são amados, cuidados, estimados, valorizados e, que pertencem a uma rede de comunicação e obrigações mútuas. Em se tratando da percepção da autoeficácia, constatou-se que esses participantes possuem crenças de que às vezes é verdade que são eficazes e que conseguem organizar e executar ações para o cumprimento de tarefas específicas. Aponta-se ainda que não existem correlações significativas entre percepção de suporte social e autoeficácia, ou seja, os níveis de percepção de suporte social não variam proporcionalmente à variação das crenças de autoeficácia em idosos. Isto significa dizer que para estes participantes, não seria eficaz investir em melhorias do suporte social, pois isto não teria impacto em suas crenças de autoeficácia. Indica-se a realização de novas pesquisas com idosos não participantes de ações de promoção à saúde, pois se pode pensar que idosos não engajados nestes tipos de ações poderiam necessitar de maior suporte social e assim, terem suas crenças de autoeficácia associadas à sua percepção de suporte social.

Expert systems for vendor selection

The survival of organisations, especially SMEs, depends, to the greatest extent, on those who supply them with the required material input. This is because if the supplier fails to deliver the right materials at the right time and place, and at the right price, then the recipient organisation is bound to fail in its obligations to satisfy the needs of its customers, and to stay in business. Hence, the task of choosing a supplier(s) from a list of vendors, that an organisation will trust with its very existence, is not an easy one. This project investigated how purchasing personnel in organisations solve the problem of vendor selection. The investigation went further to ascertain whether an Expert Systems model could be developed and used as a plausible solution to the problem. An extensive literature review indicated that very scanty research has been conducted in the area of Expert Systems for Vendor Selection, whereas many research theories in expert systems and in purchasing and supply management chain, respectively, had been reported. A survey questionnaire was designed and circulated to people in the industries who actually perform the vendor selection tasks. Analysis of the collected data confirmed the various factors which are considered during the selection process, and established the order in which those factors are ranked. Five of the factors, namely, Production Methods Used, Vendors Financial Background, Manufacturing Capacity, Size of Vendor Organisations, and Suppliers Position in the Industry; appeared to have similar patterns in the way organisations ranked them. These patterns suggested that the bigger the organisation, the more importantly they regarded the above factors. Further investigations revealed that respondents agreed that the most important factors were: Product Quality, Product Price and Delivery Date. The most apparent pattern was observed for the Vendors Financial Background. This generated curiosity which led to the design and development of a prototype expert system for assessing the financial profile of a potential supplier(s). This prototype was called ESfNS. It determines whether a prospective supplier(s) has good financial background or not. ESNS was tested by the potential users who then confirmed that expert systems have great prospects and commercial viability in the domain for solving vendor selection problems.

The Audit Commission:guiding, steering and regulating local government

How does the non-executant state ensure that its agents are fulfilling their obligations to deliver nationally determined policies? In the case of elected local government in England and Wales, this function is carried out by the Audit Commission (AC) for Local Authorities and the Health Service for England and Wales. Since being established in 1983, it is the means by which local authorities are held to account by central government, both for its own purposes and on behalf of other interested stakeholders. Although the primary function of the AC is to ensure that local authorities are fulfilling their obligations, it does so by using different methods. By acting as a regulator, an independent expert, an opinion former and a mediator, the AC steers local authorities to ensure that they are compliant with the regulatory regime and are implementing legislation properly.

Verification of floating point programs

In this thesis we present an approach to automated verification of floating point programs. Existing techniques for automated generation of correctness theorems are extended to produce proof obligations for accuracy guarantees and absence of floating point exceptions. A prototype automated real number theorem prover is presented, demonstrating a novel application of function interval arithmetic in the context of subdivision-based numerical theorem proving. The prototype is tested on correctness theorems for two simple yet nontrivial programs, proving exception freedom and tight accuracy guarantees automatically. The prover demonstrates a novel application of function interval arithmetic in the context of subdivision-based numerical theorem proving. The experiments show how function intervals can be used to combat the information loss problems that limit the applicability of traditional interval arithmetic in the context of hard real number theorem proving.

Auctions with Untrustworthy Bidders

The paper analyzes auctions which are not completely enforceable. In such auctions, economic agents may fail to carry out their obligations, and parties involved cannot rely on external enforcement or control mechanisms for backing up a transaction. We propose two mechanisms that make bidders directly or indirectly reveal their trustworthiness. The first mechanism is based on discriminating bidding schedules that separate trustworthy from untrustworthy bidders. The second mechanism is a generalization of the Vickrey auction to the case of untrustworthy bidders. We prove that, if the winner is considered to have the trustworthiness of the second-highest bidder, truthfully declaring one's trustworthiness becomes a dominant strategy. We expect the proposed mechanisms to reduce the cost of trust management and to help agent designers avoid many market failures caused by lack of trust.

Aid allocation of the emerging Central and Eastern European donors

This paper examines the main characteristics of the (re-)emerging foreign aid policies of the Visegrád countries (the Czech Republic, Hungary, Poland, Slovakia), concentrating on the allocation of their aid resources. I adopt an econometric approach, similar to the ones used in the literature, for analysing the aid allocation of the OECD DAC donors. Using this approach, I examine the various factors that influence aid allocation of the Visegrád countries, using data for the years between 2001 and 2008. The most important conclusion is that the amount of aid a partner country gets from the four emerging donors is not influenced by the level of poverty or the previous performance of the recipients (measured by the level of economic growth or the quality of institutions). The main determining factor seems to be geographic proximity, as countries in the Western Balkans and the Post-Soviet region receive much more aid from the Visegrád countries than other recipients. Historical ties (pre-1989 development relations) and international obligations in the cases of Afghanistan and Iraq are also found to be significant explanatory factors. This allocation is in line with the foreign political and economic interests of these new donors. Although there are clear similarities between the four donors, this paper also identifies some individual country characteristics.

What's in a broken promissory obligation? Developing and testing a multiple component form measure of psychological contract breach

While the literature has suggested the possibility of breach being composed of multiple facets, no previous study has investigated this possibility empirically. This study examined the factor structure of typical component forms in order to develop a multiple component form measure of breach. Two studies were conducted. In study 1 (N = 420) multi-item measures based on causal indicators representing promissory obligations were developed for the five potential component forms (delay, magnitude, type/form, inequity and reciprocal imbalance). Exploratory factor analysis showed that the five components loaded onto one higher order factor, namely psychological contract breach suggesting that breach is composed of different aspects rather than types of breach. Confirmatory factor analysis provided further evidence for the proposed model. In addition, the model achieved high construct reliability and showed good construct, convergent, discriminant and predictive validity. Study 2 data (N = 189), used to validate study 1 results, compared the multiple-component measure with an established multiple item measure of breach (rather than a single item as in study 1) and also tested for discriminant validity with an established multiple item measure of violation. Findings replicated those in study 1. The findings have important implications for considering alternative, more comprehensive and elaborate ways of assessing breach.

Theorising noncitizenship:concepts, debates and challenges

Existing political theory, particularly which deals with justice and/or rights, has long assumed citizenship as a core concept. Noncitizenship, if it is considered at all, is generally defined merely as the negation or deprivation of citizenship. As such, it is difficult to examine successfully the status of noncitizens, obligations towards them, and the nature of their role in political systems. This article addresses this critical gap by defining the theoretical problem that noncitizenship presents and demonstrating why it is an urgent concern. It surveys the contributions to the special issue for which the article is an introduction, drawing on cross-cutting themes and debates to highlight the importance of theorising noncitizenship due to both the problematic gap that exists in the theoretical literature, and the real world problems created as a result of noncitizenship which are not currently successfully addressed. Finally, the article discusses key future directions for the theorisation of noncitizenship.

Leader-member exchange and attitudes:a theoretical and empirical integration

The central proposition of this thesis is that there are key benefits to examining leadership perceptions as an attitude towards the leader. In particular, it is argued that doing so can provide an enhanced understanding of leadership perceptions and therefore advance theory in this area. To provide empirical support for this theoretcial integration, the current research focused on one of the most popular leadership theories, leader-member exchange (LMX), and demonstrated how the concept of attitude strength could advance understanding of how and when LMX influenced employee job performance. Although the measurement of LMX requires employees to provide a cognitive evaluation of their relationship with their leader, previous research has, to date, not considered this evaluation to be an attitude. This thesis provides a justification for doing so and develops two novel constructs: LMX importance and LMX ambivalence. Both of these variables are argued to represent previously unconsidered facets of the LMX relationship, which, according to attitude theory, provide a more multifaceted understanding of leadership perceptions than previously envisaged. Such an understanding can provide a more detailed understanding of how such perceptions influence outcomes. Two studies provided an empirical test of the above reasoning. Study 1, a longitudinal field study, demonstrated initial support for many of the hypotheses. LMX amivalence was shown to lead to poorer task performance and organisational citizenship behaviour, mediated by the experience of negative affect. Evidence was also found for the moderating effect of LMX importance, although felt obligations was not found to mediate this moderated effect. While Study 1 used project groups as its participants, Study 2 provided a first test of the construct in an organisational setting; with three companies proving data. Again, strong support was found for the negative effects of LMX ambivalence on employee outcomes, with evidence also found for the role of perceived organisational support in mitigating these negative effects. Support was also found for the moderated mediation hypothesis related to LMX importance, although this was only found in the largest organisation sample. Some of the main theoretical and methodological implications of viewing leadership perceptions as attitudes to the wider leadership area were discussed. The cross-fertilisation of research from the attitudes literature to understanding leadership perceptions provides new insights into leadership processes and potential avenues for further research.

Aid Allocation of the Emerging Central and Eastern European Donors

The paper examines the main characteristics of the (re)emerging foreign aid policies of the Visegrád countries (the Czech Republic, Hungary, Poland, Slovakia), concentrating on the allocation of their aid resources. We adopt an econometric approach, similar to the ones used in the literature for analyzing the aid allocation of the OECD DAC donors. Using this approach, we examine the various factors that influence aid allocation of the Visegrád countries, using data for the years between 2001 and 2008. Our most important conclusion is that the amount of aid a partner county gets from the four emerging donors is not influenced by the level of poverty or the previous performance (measured by the level of economic growth or the quality of institutions) of the recipients. The main determining factor seems to be geographic proximity, as countries in the Western-Balkans and the Post-Soviet region receive much more aid from the Visegrád countries than other recipients. Historical ties (pre-1989 development relations) and international obligations in the case of Afghanistan and Iraq are also found to be significant explanatory factors. This allocation is in line with the foreign political and economic interests of these new donors. While there are clear similarities between the four donors, the paper also identifies some individual country characteristics.

Aid Allocation of the Emerging Central and Eastern European Donors

The paper examines the main characteristics of the (re)emerging foreign aid policies of the Visegrád countries (the Czech Republic, Hungary, Poland, Slovakia), concentrating on the allocation of their aid resources. We adopt an econometric approach, similar to the ones used in the literature for analyzing the aid allocation of the OECD DAC donors. Using this approach, we examine the various factors that influence aid allocation of the Visegrád countries, using data for the years between 2001 and 2008. Our most important conclusion is that the amount of aid a partner county gets from the four emerging donors is not influenced by the level of poverty or the previous performance (measured by the level of economic growth or the quality of institutions) of the recipients. The main determining factor seems to be geographic proximity, as countries in the Western-Balkans and the Post-Soviet region receive much more aid from the Visegrád countries than other recipients. Historical ties (pre-1989 development relations) and international obligations in the case of Afghanistan and Iraq are also found to be significant explanatory factors. This allocation is in line with the foreign political and economic interests of these new donors. While there are clear similarities between the four donors, the paper also identifies some individual country characteristics.

Solvency risk minimizing guaranteed returns in life insurance

Return guarantee constitutes a key ingredient of classical life insurance premium calculation. In the current low interest rate environment insurers face increasingly strong financial incentives to reduce guaranteed returns embedded in life insurance contracts. However, return guarantee lowering efforts are restrained by associated demand effects, since a higher guaranteed return makes the net price of the insurance cover lower. This tradeoff between possibly higher future insurance obligations and the possibility of a larger demand for life insurance products can theoretically also be considered when determining optimal guaranteed returns. In this paper, optimality of return guarantee levels is analyzed from a solvency point of view. Availability and some other properties of optimal solutions for guaranteed returns are explored and compared in a simple model for two measures of solvency risk (company-level and contract-level VaR). The paper concludes that a solvency risk minimizing optimal guaranteed return may theoretically exist, although its practical availability can be impeded by economic and regulatory constraints.