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Publicações

2014

An ANFIS Based Assessment of Demand Response Driven Load Pattern Elasticity

Autores
Erdinc, O; Paterakis, N; Catalao, JPS; Bakirtzis, AG;

Publicação
2014 IEEE PES GENERAL MEETING - CONFERENCE & EXPOSITION

Abstract
Due to the recent developments in smart grid area, demand response (DR) based load pattern evaluations have gained more attention in the literature. The elasticity of load pattern related to the consumer preferences, the ratio of employing DR activities and the types of controllable loads affecting load pattern are prior topics to be evaluated in terms of better and more effective market regulation, especially in day-ahead and real time periods. In this study, an Adaptive Neuro-Fuzzy Inference System (ANFIS) based method combined with a General Algebraic Modeling System (GAMS)-based training pattern creation is presented in order to assess the effect of demand elasticity driven by DR activities in a day-ahead pool.

2014

Application of a high-throughput process analytical technology metabolomics pipeline to Port wine forced ageing process

Autores
Castro, CC; Martins, RC; Teixeira, JA; Ferreira, ACS;

Publicação
FOOD CHEMISTRY

Abstract
Metabolomics aims at gathering the maximum amount of metabolic information for a total interpretation of biological systems. A process analytical technology pipeline, combining gas chromatography-mass spectrometry data preprocessing with multivariate analysis, was applied to a Port wine "forced ageing" process under different oxygen saturation regimes at 60 degrees C. It was found that extreme "forced ageing" conditions promote the occurrence of undesirable chemical reactions by production of dioxane and dioxolane isomers, furfural and 5-hydroxymethylfurfural, which affect the quality of the final product through the degradation of the wine aromatic profile, colour and taste. Also, were found high kinetical correlations between these key metabolites with benzaldehyde, sotolon, and many other metabolites that contribute for the final aromatic profile of the Port wine. The use of the kinetical correlations in time-dependent processes as wine ageing can further contribute to biological or chemical systems monitoring, new biomarkers discovery and metabolic network investigations.

2014

Automatic Sign Language Translator Model

Autores
Escudeiro, P; Escudeiro, N; Reis, R; Barbosa, M; Bidarra, J; Gouveia, B;

Publicação
ADVANCED SCIENCE LETTERS

Abstract
In this paper we present the overall study that includes the model developed (VS-Virtual Sign Model) and the experiences performed, with an automatic bidirectional sign language translator, between written and sign language, which is being supervised by the research group GILT (Graphics, interaction and learning technologies) under the frame of a national project called Virtual Sign (VS project). This project aims to develop and evaluate a model that facilitates access for the deaf and hearing impaired to digital content in particular the educational content and learning objects creating the conditions for greater social inclusion of deaf and hearing impaired people. Access to digital content will be supported by an automatic translator between Portuguese Writing (LEP) and Portuguese Sign Language (LGP) supported by an interaction model.

2014

PBGT tool: an integrated modeling and testing environment for pattern-based GUI testing

Autores
Moreira, RMLM; Paiva, ACR;

Publicação
ACM/IEEE International Conference on Automated Software Engineering, ASE '14, Vasteras, Sweden - September 15 - 19, 2014

Abstract
Pattern Based GUI Testing (PBGT) is a new methodology that aims at systematizing and automating the GUI testing process. It is supported by a Tool (PBGT Tool) which provides an integrated modeling and testing environment that supports the crafting of test models based on UI Test Patterns, using a GUI modeling DSL called PARADIGM. The tool is freely available as an Eclipse plugin, developed on top of the Eclipse Modeling Framework. This paper presents PBGT Tool, which has been successfully used in several projects, and more recently at industry level.

2014

Beyond Post-It: Structured Multimedia Annotations for Collaborative VEs

Autores
Guerreiro, TJ; Medeiros, D; Mendes, D; Sousa, M; Jorge, JA; Raposo, A; dos Santos, IHF;

Publicação
International Conference on Artificial Reality and Telexistence and Eurographics Symposium on Virtual Environments, ICAT-EGVE 2014, Bremen, Germany, December, 8-10, 2014.

Abstract
Globalization has transformed engineering design into a world-wide endeavor pursued by geographically distributed specialist teams. Widespread adoption of VR for design and the need to act and place marks directly on the objects of discussion in design reviewing tasks led to research on annotations in virtual collaborative environments. However, conventional approaches have yet to progress beyond the yellow postit + text metaphor. Indeed, multimedia such as audio, sketches, video and animations afford greater expressiveness which could be put to good use in collaborative environments. Furthermore, individual annotations fail to capture both the rationale and flow of discussion which are key to understanding project design decisions. One exemplar instance is offshore engineering projects that normally engage geographically distributed highly-specialized engineering teams and require both improved productivity, due to project costs and the need to reducing risks when reviewing designs of deep-water oil & gas platforms. In this paper, we present an approach to rich, structured multimedia annotations to support the discussion and decision making in design reviewing tasks. Furthermore, our approach supports issue-based argumentation to reveal provenance of design decisions to better support the workflow in engineering projects. While this is an initial exploration of the solution space, examples show greater support of collaborative design review over traditional approaches. © The Eurographics Association 2014.

2014

Workload-aware table splitting for NoSQL

Autores
Cruz, F; Maia, F; Oliveira, R; Vilaça, R;

Publicação
Symposium on Applied Computing, SAC 2014, Gyeongju, Republic of Korea - March 24 - 28, 2014

Abstract
Massive scale data stores, which exhibit highly desirable scalability and availability properties are becoming pivotal systems in nowadays infrastructures. Scalability achieved by these data stores is anchored on data independence; there is no clear relationship between data, and atomic inter-node operations are not a concern. Such assumption over data allows aggressive data partitioning. In particular, data tables are horizontally partitioned and spread across nodes for load balancing. However, in current versions of these data stores, partitioning is either a manual process or automated but simply based on table size. We argue that size based partitioning does not lead to acceptable load balancing as it ignores data access patterns, namely data hotspots. Moreover, manual data partitioning is cumbersome and typically infeasible in large scale scenarios. In this paper we propose an automated table splitting mechanism that takes into account the system workload. We evaluate such mechanism showing that it simple, non-intrusive and effective. Copyright 2014 ACM.

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