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Proceedings of the 9th European Conference on Interactive TV and Video

作者： Ghisi, Bruno Cavaler Siqueira, Frank Graduate Program in Computer Science - PPGCC Department of Informatics and Statistics - INE Federal University Os Santa Catarina - UFSC Florianópolis Brazil

ISBN: (纸本)9781450306027

The currently adopted specifications for Digital Television (DTV) middleware do not define the internal characteristics of their architecture. As a result, the existing middleware implementations are not as flexible, extensible and adaptable as they should be due to the adoption of a closely-coupled architecture. This paper proposes a modular architecture for DTV middleware, which allows easy extension and updating, providing a simple way to add new features to the middleware. This architecture is based on the OSGi framework and its software components, called bundles. A categorization of these bundles was proposed, based on different usage scenarios that were identified, according to industry time-to-market and innovation needs. Prototypes of the architecture and of bundles have been implemented, and tests performed with these prototypes show the feasibility of this approach. © 2011 ACM.

关键词： Digital television

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A Study of NetCDF as an Approach for High Performance Medical Image Storage

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Journal of Physics: Conference Series 2012年第1期341卷

作者： Marcone Magnus Thiago Coelho Prado Aldo von Wangenhein Douglas D J de Macedo M A R Dantas Post-graduate Program in Computer Science Department of Informatics and Statistic Federal University of Santa Catarina Florianópolis SC - Brasil Post-graduate Program in Knowledge Engineering and Managemet Department of Knowledge Engineering Federal University of Santa Catarina Florianópolis SC - Brasil

The spread of telemedicine systems increases every day. The systems and PACS based on DICOM images has become common. This rise reflects the need to develop new storage systems, more efficient and with lower computational costs. With this in mind, this article discusses a study for application in NetCDF data format as the basic platform for storage of DICOM images. The study case comparison adopts an ordinary database, the HDF5 and the NetCDF to storage the medical images. Empirical results, using a real set of images, indicate that the time to retrieve images from the NetCDF for large scale images has a higher latency compared to the other two methods. In addition, the latency is proportional to the file size, which represents a drawback to a telemedicine system that is characterized by a large amount of large image files.

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Use of Linked Data in the design of information infrastructure for collaborative emergency management system

Use of Linked Data in the design of information infrastructu...

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International Conference on Computer Supported Cooperative Work in Design

作者： Cordeiro, Kelli De Faria Marino, Tiago Campos, Maria Luiza M. Borges, Marcos R.S. Graduate Program in Informatics Instituto de Matemática and Ncleo de Computaçado Eletrnica Universidade Federal Do Rio de Janeiro Brazil

ISBN: (纸本)9781457703874

The evolution of communication channels and social networks proliferation through the web are inspiring and enabling the construction of collaborative environments. This article proposes an architecture of processes that aims to identify information responsibilities within a general emergency scenario, considering a new way of data provenance: citizens and government agencies. Citizens, who experience as victims a chaotic scenario, can also act as collaborators, providing relevant and useful information for the decision-making process. Today, they already do this informally, sharing public interest information through social networks, such as the Tweeter. The architecture also provides procedures for treating reliability and credibility of the information, provided by the so-called anonymous officials, subjecting it to a filtering and verification process. The heterogeneity of information formats is a well-known problem that affects organizations and communities that wants to access public data. The architecture includes a Linked Open Data (LOD) approach for acquisition and integration of data maintained by government agencies that adopt different publishing standards. A solution to this problem is of particular importance to emergency response organizations that need access to all information available to better respond to disasters and crisis. © 2011 IEEE.

关键词： Decision making

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Facilitating collaborative scenario creation to support emergency plan generation

Facilitating collaborative scenario creation to support emer...

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International Conference on Computer Supported Cooperative Work in Design

作者： Lage, Bruno B. Borges, Marcos R.S. Cano, Jose H. Vivacqua, Adriana S. PPGI - Graduate Program in Informatics Federal University of Rio de Janeiro Rio de Janeiro Brazil ISSI - DSIC Universitat Politècnica de Valencia Valencia Spain

ISBN: (纸本)9781457703874

Scenarios are cornerstones of emergency plan development because they help emergency managers envision a hypothetical real situation that may occur in the future. Scenarios are composed of events, but this is not enough to reach their entire potential. The use of scenario variables along with CIA-ISM approach can be used to support the generation and interrelation of events, expanding thereby the analysis of a scenario with situations closest to reality. The more people involved in generation, the better is the result (scenario) reached. This first step of a work-in-progress in emergency plan generation aims at facilitating the collaborative scenario creation by emergency experts with the adoption of both, variables and the CIA-ISM. © 2011 IEEE.

关键词： CIA-ISM Approach Collaboration Cross-Impact Analysis Emergency Planning Interpretive Structural Modeling Scenario Variables Scenarios

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Genetic and ranking-based selection of components for multilabel classifier ensembles

Genetic and ranking-based selection of components for multil...

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International Conference on Hybrid Intelligent Systems (HIS)

作者： Nathanael Costa André L. V. Coelho Graduate Program in Applied Informatics University of Fortaleza-UNIFOR Fortaleza Brazil

This paper deals with the problem of selecting (aka pruning) components for multilabel classifier ensembles. Three methods, one based on a genetic algorithm (GA) and the others based on ranking, are applied for this purpose. In particular, we investigate the adoption of different multilabel classification measures to play the role of the objective function of these methods, paying special attention to how the choice of one measure affects the accuracy of the pruned ensembles as gauged by other measures. A preliminary empirical analysis is conducted on five problems and the results achieved indicate that the classification performance of pruned ensembles as estimated by a given multilabel measure may significantly vary according to the measure adopted for selecting the components. Moreover, although the pruning methods used can yield significant gains in terms of ensemble size reduction, the ensemble models they generate usually lag behind when contrasted to those equipped with the whole sets of components.

关键词： Accuracy Genetic algorithms Loss measurement Training Particle measurements Atmospheric measurements Hybrid intelligent systems

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Use of Linked Data in the design of information infrastructure for collaborative emergency management system

Use of Linked Data in the design of information infrastructu...

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International Conference on Computer Supported Cooperative Work in Design

作者： Kelli de Faria Cordeiro Tiago Marino Maria Luiza M. Campos Marcos R. S. Borges Graduate Program in Informatics Universidade Federal Rio de Janeiro Brasil

The evolution of communication channels and social networks proliferation through the web are inspiring and enabling the construction of collaborative environments. This article proposes an architecture of processes that aims to identify information responsibilities within a general emergency scenario, considering a new way of data provenance: citizens and government agencies. Citizens, who experience as victims a chaotic scenario, can also act as collaborators, providing relevant and useful information for the decision-making process. Today, they already do this informally, sharing public interest information through social networks, such as the Tweeter. The architecture also provides procedures for treating reliability and credibility of the information, provided by the so-called “anonymous officials”, subjecting it to a filtering and verification process. The heterogeneity of information formats is a well-known problem that affects organizations and communities that wants to access public data. The architecture includes a Linked Open Data (LOD) approach for acquisition and integration of data maintained by government agencies that adopt different publishing standards. A solution to this problem is of particular importance to emergency response organizations that need access to all information available to better respond to disasters and crisis.

关键词： Collaboration Government Resource description framework Ontologies Emergency services Social network services Decision making

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The influence of human aspects on software process improvement: Qualitative research findings and comparison to previous studies

The influence of human aspects on software process improveme...

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16th International Conference on Evaluation & Assessment in Software Engineering (EASE 2012)

作者： Davi Viana Tayana Conte Dalton Vilela Cleidson R. B. de Souza Gleison Santos Rafael Prikladnicki Grupo de Pesquisa USES Universidade Federal do Amazonas Manaus Amazonas Brazil Analyses Research and Technology Innovation Foundation Center (FUCAPI) Manaus Amazonas Brazil Laboratório de Engenharia de Software Universidade Federal do Pará Belem Para Brazil Graduate Program in Informatics (PPGI) UNIRIO-Federal University of Rio de Janeiro State Rio de Janeiro Brazil Pontifícia Universidade do Rio Grande do Sul Rio Grande do Sul Brazil

ISBN: (纸本)9781622762538

Background: Understanding how to successfully deal with human and technical aspects involved in Software Process Improvement (SPI) programs is a challenging issue. Technical aspects are not enough to guarantee the success of activities. Human factors (e.g., experiences, opinions and perceptions) impact the effectiveness of SPI programs. Aim: this paper aims to improve our current understanding on how human aspects can influence SPI programs from the point of view of the professionals involved in such efforts. We compare our findings with the results of previous studies in order to analyze the different contexts in which human aspects influence SPI. Method: We conducted a qualitative study in the context of small companies involved in SPI programs in Amazonas State in Brazil based on the Brazilian Maturity Model - ***. We used semi-structural interviews with software engineers. Results: We identified findings about eleven of the fourteen investigated human aspects. We identified new characteristics that motivate actors to get involved in SPI programs. Finally, while previous research indicated that the process of individual decision making as a negative aspect, we identified this as a positive aspect. Conclusions: Despite the differences in companies' size and maturity models, our findings corroborate many of the important results of previous case studies. The consistency of the presented results with previous research in different organizations, teams, and countries suggest that these results are true for software engineering in general. However, there were differences related to the motivating factors and the perception of the individual decision making. In our study, we observed that the personality, perception and employee selection aspects were also significant to the SPI program's success. This has not been re

关键词： Human aspects Software Process Improvement Qualitative studies SPI software process improvement TECHNICAL ASPECTS Qualitative Research Software engineering Perception Human

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On ensembles of biclusters generated by NichePSO

On ensembles of biclusters generated by NichePSO

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Congress on Evolutionary Computation

作者： Lara Menezes André L. V. Coelho Graduate Program in Applied Informatics University of Fortaleza-UNIFOR Fortaleza Ceara Brazil

Ensemble methods combine multiple models into a single framework for coping better with Machine Learning tasks. Recently, the well-known Bagging approach was adapted to solve biclustering problems, where the objective is to find large sub-groups of samples and attributes of the data matrix with the samples showing high correlation over the attributes. In this paper, aiming at the generation of more diverse and high-quality biclusters to be fused through an ensemble perspective, we have adopted a well-known multimodal Particle Swarm Optimization algorithm, namely NichePSO. In particular, the study brings a preliminary comparative assessment of the biclustering results delivered by NichePSO operating alone and by two ensemble settings (one of which is Bagging) operating on the biclusters produced by NichePSO. The assessment was done based on bioinformatics and collaborative filtering datasets, and the results achieved so far reveal the usefulness of ensembling the repertory of biclusters produced by NichePSO.

关键词： Bagging Bioinformatics Probability Coherence Particle swarm optimization Context Indexes

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Visually inspecting the search behavior of Harmony Search and its variants with Viz3D

Visually inspecting the search behavior of Harmony Search an...

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Congress on Evolutionary Computation

作者： Marcelo Lotif André L. V. Coelho Graduate Program in Applied Informatics (MIA) University of Fortaleza-UNIFOR Fortaleza Ceara Brazil

The aim of this study is to assess the Harmony Search (HS) meta-heuristic and some of its variants when submitted to benchmark continuous optimization problems to reveal whether and how such variants change the patterns of search behavior exhibited by the canonical version. For this purpose, a new Visual Mining tool based on the Viz3D algorithm was developed to aid in the visualization of how the HS algorithms effectively explore the search space. The results achieved provide evidence that the gains in performance usually promoted by the HS variants are indeed related to noticeable modifications in the search behavior as displayed by the original version.

关键词： Visualization Optimization Search problems Data visualization Nickel Data mining Algorithm design and analysis

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Using memory access traces to map threads and data on hierarchical multi-core platforms

Using memory access traces to map threads and data on hierar...

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25th IEEE International Parallel and Distributed Processing Symposium, Workshops and Phd Forum, IPDPSW 2011

作者： Da Cruz, Eduardo Henrique Molina Alves, Marco Antonio Zanata Carissimi, Alexandre Navaux, Philippe Olivier Alexandre Ribeiro, Christiane Pousa Méhaut, Jean-François PPGC Graduate Program in Computer Science Institute of Informatics UFRGS Federal University of Rio Grande do Sul Porto Alegre RS Brazil INRIA Mescal Research Team LIG Laboratory Grenoble University France

ISBN: (纸本)9780769543857

In parallel programs, the tasks of a given application must cooperate in order to accomplish the required computation. However, the communication time between the tasks may be different depending on which core they are executing and how the memory hierarchy and interconnection are used. The problem is even more important in multi-core machines with NUMA characteristics, since the remote access imposes high overhead, making them more sensitive to thread and data mapping. In this context, process mapping is a technique that provides performance gains by improving the use of resources such as interconnections, main memory and cache memory. The problem of detecting the best mapping is considered NP-Hard. Furthermore, in shared memory environments, there is an additional difficulty of finding the communication pattern, which is implicit and occurs through memory accesses. This work aims to provide a method for static mapping for NUMA architectures which does not require any prior knowledge of the application. Different metrics were adopted and an heuristic method based on the Edmonds matching algorithm was used to obtain the mapping. In order to evaluate our proposal, we use the NAS Parallel Benchmarks (NPB) and two modern multi-core NUMA machines. Results show performance gains of up to 75% compared to the native scheduler and memory allocator of the operating system. © 2011 IEEE.

关键词： Cache memory

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