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Publications

Publications by HumanISE

2015

An Execution Model for Fine-Grained Parallelism in Ada

Authors
Pinho, LM; Moore, B; Michell, S; Taft, ST;

Publication
Ada-Europe

Abstract
This paper extends the authors earlier proposal for providing Ada with support for fine-grained parallelism with an execution model based on the concept of abstract executors, detailing the progress guarantees that these executors must provide and how these can be assured even in the presence of potentially blocking operations. The paper also describes how this execution model can be applied to real-time systems. © Springer International Publishing Switzerland 2015.

2015

A Novel Run-Time Monitoring Architecture for Safe and Efficient Inline Monitoring

Authors
Nelissen, G; Pereira, D; Pinho, LM;

Publication
Ada-Europe

Abstract
Verification and testing are two of the most costly and time consuming steps during the development of safety critical systems. The advent of complex and sometimes partially unpredictable computing architectures such as multicore commercial-of-the-shelf platforms, together with the composable development approach adopted in multiple industrial domains such as avionics and automotive, rendered the exhaustive testing of all situations that could potentially be encountered by the system once deployed on the field nearly impossible. Run-time verification (RV) is a promising solution to help accelerate the development of safety critical applications whilst maintaining the high degree of reliability required by such systems. RV adds monitors in the application, which check at run-time if the system is behaving according to predefined specifications. In case of deviations from the specifications during the runtime, safeguarding measures can be triggered in order to keep the system and its environment in a safe state, as well as potentially attempting to recover from the fault that caused the misbehaviour. Most of the state-of-the-art on RV essentially focused on the monitor generation, concentrating on the expressiveness of the specification language and its translation in correct-by-construction monitors. Few of them addressed the problem of designing an efficient and safe run-time monitoring (RM) architecture. Yet, RM is a key component for RV. The RM layer gathers information from the monitored application and transmits it to the monitors. Therefore, without an efficient and safe RM architecture, the whole RV system becomes useless, as its inputs and hence by extension its outputs cannot be trusted. In this paper, we discuss the design of a novel RM architecture suited to safety critical applications. © Springer International Publishing Switzerland 2015.

2015

Overhead-aware schedulability evaluation of semi-partitioned real-time schedulers

Authors
Souto, P; Sousa, PB; Davis, RI; Bletsas, K; Tovar, E;

Publication
2015 IEEE 21ST INTERNATIONAL CONFERENCE ON EMBEDDED AND REAL-TIME COMPUTING SYSTEMS AND APPLICATIONS

Abstract
Schedulability analyses, while valuable in theoretical research, cannot be used in practice to reason about the timing behaviour of a real-time system without including the overheads induced by the implementation of the scheduling algorithm. In this paper, we provide an overhead-aware schedulability analysis based on demand bound functions for two hard real-time semi-partitioned scheduling algorithms, EDFWM- and C=D. This analysis is based on a novel implementation that uses a global clock to reduce the overheads incurred due to the release jitter of migrating subtasks. The analysis is used to guide the respective off-line task assignment and splitting procedures. Finally, results of an evaluation are provided highlighting how the different algorithms perform with and without a consideration of overheads.

2015

O impacto dos sistemas e tecnologias de informação no turismo em espaço rural na região do Algarve

Authors
Pego, Ana; Bernardo, Maria do Rosário Matos;

Publication
Dos Algarves: a Multidisciplinary e-Journal

Abstract
O presente artigo tem como objeto os resultados dum estudo que teve por objetivo a investigação do uso dos sistemas e tecnologias de informação (STI) no turismo em espaço rural (TER) na região do Algarve. Os resultados foram obtidos através de um questionário eletrónico, direcionado a proprietários e/ou gestores de 51 unidades TER, no qual se procurou identificar o impacto dos STI nas variáveis: tomada de decisão; satisfação dos gestores quanto ao uso dos STI; qualidade do serviço de reservas de quarto; e resultados financeiros. O estudo permitiu concluir que, de uma forma geral, a utilização dos STI são uma componente importante na gestão das unidades TER e têm impactos positivos na identificação de problemas e minimização do seu tempo de resolução; na confiança depositada no sistema e linguagem utilizada no computador; na qualidade das reservas de quartos; e nos resultados financeiros por via da inovação em tecnologia e existência de rede na organização.;This article aims to present the results of a study that investigated the use of information systems and technologies (IST) in tourism in rural space (TRS) in the Algarve region. The results were obtained through an electronic questionnaire given to the owners and/or managers of fifty one units TRS, in which we tried to identify the impact of IST in the following variables: decision making, satisfaction of managers in the use of IST, quality of room reservations service, and financial results. The study concluded that, in general, the use of IST are an important component in the TRS units of management and have positive impacts in identifying problems and minimizing their time resolution, confidence in the system and language used in the computer, the quality of rooms reservations, and financial results through innovation in technology, and network existence in the organization.

2015

Mídia social em contexto de hibridismo e multimodalidade: o percurso da experiência na formação de mestres e doutores

Authors
Schlemmer, E;

Publication
Revista Diálogo Educacional

Abstract
Este artigo se contextualiza no Grupo de Pesquisa Educação Digital (GPe-dU Unisinos/CNPq), vinculado à linha de pesquisa Educação, Desenvolvimento e Tecnologias, do Programa de Pós-Graduação em Educação da Unisinos e parte da problemática: Como as mídias sociais podem contribuir com o processo de formação de professores-pesquisadores em contexto de hibridismo e multimodalidade? Seu objetivo consiste em compreender e discutir os significados construídos em relação à docência para a formação do professor-pesquisador em contexto de hibridismo e multimodalidade, quando um dos espaços disponibilizados para a prática pedagógica é uma mídia social. A pesquisa, exploratória e qualitativa, é inspirada no método cartográfico e faz uso da observação; de textos e fotografia digitais; de discursos; e de acompanhamento da experiência (trilhas). Para a análise dos dados utiliza a análise textual discursiva. Os principais resultados evidenciam que as mídias sociais podem contribuir com a formação do professor-pesquisador tanto por meio da criação de grupos no âmbito das atividades acadêmicas curriculares quanto no âmbito da prática de pesquisa e da orientação. Os dados indicam que um número significativo de sujeitos continua interagindo nos grupos, mesmo após seu término, o que contribui para que se constitua enquanto uma comunidade virtual de aprendizagem e de prática, além disso, a cada novo semestre, novos sujeitos passam a integrar essa comunidade, o que enriquece as trocas, dando origem a um processo de formação continuada.

2015

Learning in Metaverses

Authors
Schlemmer, E; Backes, L;

Publication
Advances in Educational Technologies and Instructional Design

Abstract

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