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What can a big program teach us about optimization?

What can a big program teach us about optimization?

引用

5th International Symposium on Search-Based Software engineering, SSBSE 2013

作者： De Oliveira Barros, Márcio De Almeida Farzat, Fábio Post-graduate Information Systems Program PPGI/UNIRIO Av. Pasteur 458 Urca - Rio de Janeiro RJ Brazil Computers and System Engineering Program COPPE/UFRJ Cidade Universitária Cx Postal 68501 Rio de Janeiro RJ Brazil

ISBN: (纸本)9783642397417

In this paper we report on the evolution of Apache Ant, a build automation tool developed in Java. We observed a typical case of architectural mismatch in this system: its original simple design was lost due to maintenance and addition of new features. We have applied SBSE techniques to determine whether the search would be able to recover at least parts of the original design, in a metrics-based optimization. We observed that current SBSE techniques produce complex designs, but they also allow us to study the limitations of present design metrics. In the end, we propose a new research perspective joining software clustering and refactoring selection to improve software evolution. © 2013 Springer-Verlag.

关键词： Optimization

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Learning context to adapt business processes

Learning context to adapt business processes

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International Conference on Computer Supported Cooperative Work in Design

作者： Juliana do E. Santo Carvalho Flavia Maria Santoro Kate Revoredo Vanessa Tavares Nunes Postgraduate Information Systems Program UNIRIO Rio de Janeiro Brazil COPPE PESC-Systems Engineering and Computer Science Program UFRJ Rio de Janeiro Brazil

ISBN: (纸本)9781467360845

Dynamic adaptation is the customization of a business process to make it applicable to a particular situation at any time of its life cycle. Adapting requires experience, and involves knowledge about various, internal and external, aspects of business. Thus, we argue for the application of adaptation rules, considering the context of a particular process instance. Furthermore, we state that a context-based adaptation environment should go beyond, and learn from decisions, as well as continuously identify new unforeseen situations (context definitions). The aim of this paper is to present a computational engine that infers the need to update situations and adaptation rules, suggesting changes to them. An application scenario is presented to discuss the usage of the proposal.

关键词： Context Itemsets Proposals Adaptation models Aircraft Runtime

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Formalizing the situation of a business process activity

Formalizing the situation of a business process activity

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2012 IEEE 16th International Conference on Computer Supported Cooperative Work in Design, CSCWD 2012

作者： Mattos, Talita Da Cunha Santoro, Flávia Maria Revoredo, Kate Nunes, Vanessa Tavares Postgraduate Information Systems Program UNIRIO Rio de Janeiro Brazil COPPE/PESC - Systems Engineering and Computer Science Program UFRJ Rio de Janeiro Brazil

ISBN: (纸本)9781467312127

Business processes are dynamic and constantly evolving. Contextual elements that had not yet been identified and represented can arise and influence the execution of each process instance in diverse manners. In this scenario, the identification of these elements is considered of great importance. This paper proposes a formalism for context associated with business processes that intends to identify the situation of an activity in order to subsidize decisions to be taken within the execution of a process. © 2012 IEEE.

关键词： Business Process Context

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Introducing software process tailoring to BPMN: BPMNt

Introducing software process tailoring to BPMN: BPMNt

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2012 International Conference on Software and System Process, ICSSP 2012

作者： Pillat, Raquel M. Oliveira, Toacy C. Fonseca, Fabio L. Systems Engineering and Computer Science Program - PESC / COPPE Federal University of Rio de Janeiro - UFRJ Rio de Janeiro Brazil

ISBN: (纸本)9781467323529

BPMN 2.0 is a widely used notation to model business process that has associated tools and techniques to facilitate process management, execution and monitoring. As a result using BPMN to model Software Development Process (SDP) can leverage on the BPMN's infrastructure to improve SDP quality. Nevertheless, when using BPMN to model Software Processes one can observe the lack of an important feature: means to represent process tailoring. This article introduces the BPMNt, a conservative extension to BPMN that aims at aggregating a tailoring representation mechanism as the one found at SPEM 2.0. BPMNt uses the extensibility classes already present in the BPMN meta-model. Our work also presents an example to illustrate the approach. © 2012 IEEE.

关键词： Software design

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Mediating process adaptation through a goal-oriented context-aware approach

Mediating process adaptation through a goal-oriented context...

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2012 IEEE 16th International Conference on Computer Supported Cooperative Work in Design, CSCWD 2012

作者： Nunes, Vanessa Tavares Werner, Cláudia M. Lima Santoro, Flávia Maria COPPE/PESC - Systems Engineering and Computer Science Program UFRJ PO Box 68511 21945-970 Rio de Janeiro Brazil NP2Tec and Postgraduate Information Systems Program UNIRIO Rio de Janeiro Brazil

ISBN: (纸本)9781467312127

Complexity and dynamism of day-to-day activities in organizations are inextricably linked, one impacting the other, increasing the challenges for constant adaptation on the way to organize work to address emerging demands. Market is demanding systems that are aware of organizations processes and able to evolve and adapt to new situations in everyday working activities. We argue that flexibility in processes could be managed in real time, by PAIS (Process-aware Information systems), using context information collected in the work environment. This paper proposes CGAdapt, a context management architecture approach that aims to improve and automate dynamic process adaptation. We explain how process adaptation may occur in real time through an existent scenario using this proposal and discuss the value of context-awareness to reason about process alternative adaptations in a goal oriented approach. © 2012 IEEE.

关键词： Real time systems

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Static packet routing in NoC platform using ACO-based algorithms

Static packet routing in NoC platform using ACO-based algori...

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13th International Conference on Intelligent Data engineering and Automated Learning, IDEAL 2012

作者： Silva Jr., Luneque Nedjah, Nadia De Macedo Mourelle, Luiza Systems Engineering and Computer Science Program COPPE Federal University of Rio de Janeiro Brazil Department of Electronics Engineering and Telecommunications State University of Rio de Janeiro Brazil Department of Systems Engineering and Computation State University of Rio de Janeiro Brazil

ISBN: (纸本)9783642326387

Networks-on-Chip (NoC) have been used as an interesting option in design of communication infrastructures for embedded systems, providing a scalable structure and balancing the communication between cores. Because several data packets can be transmitted simultaneously through the network, an efficient routing strategy must be used in order to avoid congestion delays. In this paper, ant colony algorithms were used to find and optimize routes in a mesh-based NoC, where several randomly generated applications have been mapped. The routing optimization is driven by the minimization of total latency in packets transmission between tasks. The simulation results show the effectiveness of the ant colony inspired routing by comparing it with general purpose algorithms for deadlock free routing. © 2012 Springer-Verlag.

关键词： Ant colony optimization

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The influence of human capabilities in effort estimation of business processes modeling projects

The influence of human capabilities in effort estimation of ...

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5th International Conference on Research and Practical Issues of Enterprise Information systems, CONFENIS 2011

作者： Dutra, José Roberto De Barros, Márcio O. Santoro, Flávia Maria Magdaleno, Andréa M. Cappelli, Claudia Nunes, Vanessa Klussman, Felipe Postgraduate Information Systems Program UNIRIO Brazil NP2Tec Research and Practice Group in Information Technology UNIRIO Rio de Janeiro RJ Brazil COPPE UFRJ Systems Engineering and Computer Science Program Rio de Janeiro RJ Brazil

ISBN: (纸本)9780415631310

Business processes modeling projects are increasingly widespread in organizations, which usually invest much in hiring expert consultants to do such job. These consultants come from various organizations, and have different experiences on how to perform the same activity. This paper analyzes how human-related capabilities influence the effort required to conduct a business process modeling project and discusses the results obtained from about 50 projects executed in a large Brazilian company. © 2012 Taylor & Francis Group, London.

关键词： systems engineering

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Awareness and comprehension in software/systems engineering practice and education: Trends and research directions

Awareness and comprehension in software/systems engineering ...

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26th Brazilian Symposium on Software engineering, SBES 2012

作者： Schots, Marcelo Werner, Cláudia Mendonça, Manoel Systems Engineering and Computing Program COPPE/UFRJ Federal University of Rio de Janeiro Rio de Janeiro Brazil Computer Science Department Federal University of Bahia Rio de Janeiro Brazil

ISBN: (纸本)9780769548685

The creation of tools, techniques and methodologies to support the manipulation of large data sets has been receiving special attention of both scientific and industrial communities, in order to discover new ways of dealing with the underlying information, including learning purposes, identification of patterns, decision making support, amongst others. However, making use of computing resources to enhance awareness and understanding of software information and the software itself is still a challenge in software/systems engineering, since it involves the identification of suitable mechanisms, adequate abstractions, and studies on stimulation of the human perceptive and cognitive abilities. This paper presents some of the challenges in this context, based on current trends of software development lifecycle, program comprehension, and software engineering education. At the end, a special focus is given on ongoing research on using and improving current mechanisms for supporting software reuse practices and software comprehension in general. © 2012 IEEE.

关键词： Computer software reusability

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Formalizing the situation of a business process activity

Formalizing the situation of a business process activity

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International Conference on Computer Supported Cooperative Work in Design

作者： Talita da Cunha Mattos Flávia Maria Santoro Kate Revoredo Vanessa Tavares Nunes Postgraduate Information Systems Program UNIRIO Rio de Janeiro Brazil COPPE/PESC-Systems Engineering and Computer Science Program UFRJ Rio de Janeiro Brazil

关键词： Computational modeling Context Psychology Media Navigation

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An efficient parallel architecture for ray-tracing

An efficient parallel architecture for ray-tracing

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作者： Nery, Alexandre S. Nedjah, Nadia França, Felipe M.G. LAM - Computer Architecture and Microeletronics Laboratory Systems Engineering and Computer Science Program COPPE Universidade Federal Do Rio de Janeiro Rio de Janeiro RJ Brazil Department of Electronics Engineering and Telecommunications Faculty of Engineering Universidade Do Estado Do Rio de Janeiro Rio de Janeiro RJ Brazil

Real time rendering of three-dimensional scenes in high photorealistic details is a hard task, such as in the ray tracing rendering algorithm. In general, the performance achieved by a sequential software-based implementation of ray tracing is far from satisfactory. However, parallel implementations of ray tracing have been enabling reasonable real time performance, as the algorithm is embarrassingly parallel. Thus, a custom parallel design in hardware is likely to achieve an even higher performance. In this paper, we propose a hardware parallel architecture capable of dealing with the main desirable features of ray tracing, such as shadows and reflection effects, imposing low area cost and a promising rendering performance. Such architecture, called GridRT, is based on the Uniform Grid acceleration structure and is intended to deliver massive parallelism through parallel ray-triangle intersection tests as well as parallel processing of many rays. A hardware implementation of the proposed architecture is presented, together with some performance results and resources requirements. The rendering is reduced by 80% using a grid configuration of eight processing elements. © Springer Science+Business Media, LLC 2011.

关键词： Field programmable gate arrays (FPGA)

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