Replica management in real-time Ada 95 applications

In this paper, we present some of the fault tolerance management mechanisms being implemented in the Multi-�� architecture, namely its support for replica non-determinism. In this architecture, fault tolerance is achieved by node active replication, with software based replica management and fault tolerance transparent algorithms. A software layer implemented between the application and the real-time kernel, the Fault Tolerance Manager (FTManager), is the responsible for the transparent incorporation of the fault tolerance mechanisms The active replication model can be implemented either imposing replica determinism or keeping replica consistency at critical points, by means of interactive agreement mechanisms. One of the Multi-�� architecture goals is to identify such critical points, relieving the underlying system from performing the interactive agreement in every Ada dispatching point.

Multi-��: an Ada 95 based architecture for fault tolerance support of real-time systems

This paper presents an architecture (Multi-��) being implemented to study and develop software based fault tolerant mechanisms for Real-Time Systems, using the Ada language (Ada 95) and Commercial Off-The-Shelf (COTS) components. Several issues regarding fault tolerance are presented and mechanisms to achieve fault tolerance by software active replication in Ada 95 are discussed. The Multi-�� architecture, based on a specifically proposed Fault Tolerance Manager (FTManager), is then described. Finally, some considerations are made about the work being done and essential future developments.

A parallel programming model for ada

Over the last three decades, computer architects have been able to achieve an increase in performance for single processors by, e.g., increasing clock speed, introducing cache memories and using instruction level parallelism. However, because of power consumption and heat dissipation constraints, this trend is going to cease. In recent times, hardware engineers have instead moved to new chip architectures with multiple processor cores on a single chip. With multi-core processors, applications can complete more total work than with one core alone. To take advantage of multi-core processors, parallel programming models are proposed as promising solutions for more effectively using multi-core processors. This paper discusses some of the existent models and frameworks for parallel programming, leading to outline a draft parallel programming model for Ada.

Programming atomic multicasts in CAN

In Distributed Computer-Controlled Systems (DCCS), a special emphasis must be given to the communication infrastructure, which must provide timely and reliable communication services. CAN networks are usually suitable to support small-scale DCCS. However, they are known to present some reliability problems, which can lead to an unreliable behaviour of the supported applications. In this paper, an atomic multicast protocol for CAN networks is proposed. This protocol explores the CAN synchronous properties, providing a timely and reliable service to the supported applications. The implementation of such protocol in Ada, on top of the Ada version of Real-Time Linux is presented, which is used to demonstrate the advantages and disadvantages of the platform to support reliable communications in DCCS.

Business micro-location: factors, preferences and indicators to assess the influence factors

The paper presents a study on business micro-location behaviour as well as corresponding factors of in���uence, conducted in two metropolitan areas, Bucharest-Ilfov (Romania) and Greater Porto (Portugal). By business micro-location we refer to a speci���c site such as a building or facility, accommodating a business within a small, compact geographical area (e.g. metropolitan area). At this geographical scale, the macroeconomic layer factors were excluded, applicable when discern between regions or countries. The factors derived from location theory and previous empirical studies were surveyed, completing a cross-sectional analysis in order to ���nd out the speci���c weights of the location factors and preferences, by region and by industry. Based on already established ���rms��� feedback on location, the speci���c weights were granted by each industry to the main location factors, types of areas, and types of accommodation facilities. The authors also suggested a model to integrate these results into a Geographical Information System (GIS).

O projeto COMAP - comiss��o de apadrinhamento

Trabalho de Projeto apresentado ao Instituto Superior de Contabilidade e Administra����o do Porto para a obten����o do grau de Mestre em Marketing Digital, sob orienta����o do Mestre Ant��nio da Silva Vieira

Caracteriza����o e Planeamento Urbano da Zona de Interven����o Priorit��ria da Cidade do Porto pela Porto Vivo, SRU

O presente relat��rio de est��gio descreve as atividades realizadas durante o per��odo do est��gio curricular, com a dura����o de 6 meses, na empresa Porto Vivo, SRU ��� Sociedade de Reabilita����o Urbana da Baixa Portuense S.A. Inicialmente efetua-se uma descri����o da empresa, indicando a miss��o, os objetivos e alguns dos seus projetos realizados ou em realiza����o. De seguida e com o intuito de compreender a ��rea em que Porto Vivo, SRU atua, �� realizado um enquadramento demogr��fico e geogr��fico da zona de interven����o priorit��ria da cidade do Porto. As atividades realizadas, nomeadamente os levantamentos da din��mica imobili��ria, das unidades de alojamento, do edificado e ainda o acompanhamento de vistorias ao estado de conserva����o dos edif��cios, s��o descritas destacando-se os objetivos e todos os procedimentos necess��rios �� sua execu����o. Com base nas duas primeiras atividades, realizou-se um estudo de forma a compreender a rela����o de desenvolvimento do estado de conserva����o das edifica����es com a din��mica imobili��ria. Por ��ltimo �� desenvolvido um caso de estudo onde se analisa a evolu����o do quarteir��o Carlos Alberto, descrevendo todas as fases do seu processo de reabilita����o. Menciona-se a estrat��gia implementada pela Porto Vivo, SRU e de que forma �� que esta influencia a execu����o do projeto de reabilita����o.

User Profiling and Knowledge Extraction For Tourism

O sector do turismo �� uma ��rea francamente em crescimento em Portugal e que tem desenvolvido a sua divulga����o e estrat��gia de marketing. Contudo, apenas se prende com indicadores de desempenho e de oferta instalada (n��mero de quartos, hot��is, voos, estadias), deixando os indicadores estat��sticos em segundo plano. De acordo com o ��� Travel & tourism Competitiveness Report 2013���, do World Economic Forum, classifica Portugal em 72�� lugar no que respeita �� qualidade e cobertura da informa����o estat��stica, dispon��vel para o sector do Turismo. Refira-se que Espanha ocupa o 3�� lugar. Uma estrat��gia de mercado, sem base anal��tica, que sustente um quadro de orienta����es espec��fico e objetivo, com relevante conhecimento dos mercados alvo, dificilmente �� compreens��vel ou at�� mesmo materializ��vel. A implementa����o de uma estrutura de Business Intelligence que permita a realiza����o de um levantamento e tratamento de dados que possibilite relacionar e sustentar os resultados obtidos no sector do turismo revela-se fundamental e crucial, para que sejam criadas estrat��gias de mercado. Essas estrat��gias s��o realizadas a partir da informa����o dos turistas que nos visitam, e dos potenciais turistas, para que possam ser cativados no futuro. A an��lise das caracter��sticas e dos padr��es comportamentais dos turistas permite definir perfis distintos e assim detetar as tend��ncias de mercado, de forma a promover a oferta dos produtos e servi��os mais adequados. O conhecimento obtido permite, por um lado criar e disponibilizar os produtos mais atrativos para oferecer aos turistas e por outro inform��-los, de uma forma direcionada, da exist��ncia desses produtos. Assim, a associa����o de uma recomenda����o personalizada que, com base no conhecimento de perfis do turista proceda ao aconselhamento dos melhores produtos, revela-se como uma ferramenta essencial na capta����o e expans��o de mercado.