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Performance of the SegNet in the Segmentation of Breast Ultrasound Lesions

Performance of the SegNet in the Segmentation of Breast Ultr...

引用

Pan American Health Care Exchanges, PAHCE

作者： P. O. Vianna R. Farias W. C. A. Pereira Biomedical Engineering Program COPPE/Federal University of Rio de Janeiro RJ Brazil Systems and Computing Engineering Program COPPE/Federal University of Rio de Janeiro RJ Brazil

ISBN: (纸本)9781728170558

This work presents a performance analysis of a convolutional neural network (CNN), named SegNet, applied for automatic segmentation of breast ultrasound images. Defining the viability of CNN's could help with feature extraction and posterior classification of lesions, causing a decrease in the number of unnecessary biopsies. The breast ultrasound (BUS) dataset consists of 2054 images from 659 female patients, and each image was manually segmented by an experienced radiologist. The dataset is fed into the CNN without any filtering process applied to it and the test output is then compared with the radiologist's labels. We compared the results of different loss and activation functions, and the experiments reveal that the best performance was achieved using dice loss function, with dice coefficient of 81.1%.

关键词： Image segmentation Ultrasonic imaging Medical services Breast Feature extraction Generative adversarial networks Performance analysis

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Who is right? Evaluating empirical contradictions in the readability & comprehensibility of source code 20

Who is right? Evaluating empirical contradictions in the rea...

引用

20th Ibero-American Conference on Software engineering, CIbSE 2017

作者： Ribeiro, Talita Vieira Travassos, Guilherme Horta PESC/COPPE/UFRJ - Systems Engineering and Computer Science Program Centro de Tecnologia Federal University of Rio de Janeiro Cidade Universitária Bloco H Sala 319 Rio de Janeiro RJ Brazil

ISBN: (纸本)9789873806988

Context: Several code guidelines aim at providing a common perspective on the readability and comprehensibility of source code. However, in many cases, they are contradictory on how to improve these quality characteristics. Objective: To analyze the influence of three contradictory source code attributes - indentation spacing, identifier length and code size - on the source code reada-bility and comprehensibility, interpreting whether programming experience and domain knowledge can support explaining these contradictions. Method: To per-form an empirical study with software developers collecting quantitative (Likert scale) and qualitative data to assess the readability and comprehensibility of de-velopers regarding Python snippets. To observe eventual perceptions contradic-tions and whether their levels of experience and knowledge have something to do with such contrary results. Results: Regardless their programming experience, 4-spaces indentation dominated the readability preference of participants. While the readability and comprehensibility preferences towards long and complete-word identifiers were mostly true for both novice/experts, developers with more experience and low domain knowledge level seemed to be more affected by the length of identifiers. Furthermore, while all participants showed more positive comprehensibility perceptions for Pythin snippets with more lines of code, their readability perceptions regardnig code size were contradictory since the less experienced participants preferred more lines of code and the more experienced ones prefer fewer lines. Conclusion: The results presented in the technical literature seemed to be caused by the interchangeable use of the readability and comprehensibility concepts. Further investigation is still needed to observe whether other confounding factors might support the explanation of such contrary results.

关键词： Codes (symbols)

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What can a big program teach us about optimization?

What can a big program teach us about optimization?

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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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Context-based process line

Context-based process line

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作者： Nunes, Vanessa Werner, Claudia Santoro, Flavia Maria COPPE/UFRJ Systems Engineering and Computer Science Program P.O. Box 68511 Rio de Janeiro RJ Brazil NP2Tec and Postgraduate Information Systems Program UNIRIO Av. Pasteur 458 Urca - Rio de Janeiro RJ Brazil

ISBN: (纸本)9789898425065

Complexity and dynamism of day-to-day activities in organizations are inextricably linked, one impacting the other, increasing the challenges for constant adaptation of the way to organize work to address emerging demands. In this scenario, there are a variety of information, insight and reasoning being processed between people and systems, during process execution. We argue that process variations could be decided in real time, using context information collected. This paper presents a proposal for a business process line cycle, with a set of activities encapsulated in the form of components as central artefact. We explain how composition and adaptation of work may occur in real time and discuss a scenario for this proposal.

关键词： Enterprise resource management

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Hardware reuse in modern application-specific processors and accelerators

Hardware reuse in modern application-specific processors and...

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2011 14th Euromicro Conference on Digital System Design: Architectures, Methods and Tools, DSD 2011

作者： Nery, Alexandre S. Jozwiak, Lech Lindwer, Menno Cocco, Mauro Nedjah, Nadia França, Felipe M.G. LAM - Computer Architecture and Microelectronics Laboratory Systems Engineering and Computer Science Program COPPE Universidade Federal do Rio de Janeiro Brazil Department of Electronics Engineering and Telecommunications Faculty of Engineering Universidade do Estado do Rio de Janeiro Brazil Department of Electrical Engineering - Electronic Systems Eindhoven University of Technology Netherlands Silicon Hive - Intel UMG Netherlands

ISBN: (纸本)9780769544946

Effective exploitation of the application-specific parallel patterns and computation operations through their direct implementation in hardware is the base for construction of high-quality application-specific (re-) configurable application specific instruction set processors (ASIPs) and hardware accelerators for modern highly-demanding applications. Although it receives a lot of attention from the researchers and practitioners, a very important problem of hardware reuse in ASIP and accelerator synthesis is clearly underestimated and does not get enough attention in the published research. This paper is an effect of an industry and academic collaborative research. It analyses the problem of hardware sharing, shows its high practical relevance, as well as a big influence of hardware sharing on the major circuit and system parameters, and its importance for the multi-objective optimization and tradeoff exploitation. It also demonstrates that the state-of-the-art synthesis tools do not sufficiently address this problem and gives several guidelines related to enhancement of the hardware reuse. © 2011 IEEE.

关键词： Multiobjective optimization

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Memory-Aware and Efficient Ray-Casting Algorithm

Memory-Aware and Efficient Ray-Casting Algorithm

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Brazilian Symposium on Computer Graphics and Image Processing (SIBGRAPI)

作者： Saulo Ribeiro Andre Maximo Cristiana Bentes Antonio Oliveira Ricardo Farias COPPE-Systems Engineering Program Federal University of Rio de Janeiro Brazil Department of Systems Engineering State University of Rio de Janeiro Brazil

Ray-casting implementations require that the connectivity between the cells of the dataset to be explicitly computed and kept in memory. This constitutes a huge obstacle for obtaining real-time rendering for very large models. In this paper, we address this problem by introducing a new implementation of the ray-casting algorithm for irregular datasets. Our implementation optimizes the memory usage of past implementations by exploring ray coherence. The idea is to keep in main memory the information of the faces traversed by the ray cast through every pixel under the projection of a visible face. Our results show that exploring pixel coherence reduces considerably the memory usage, while keeping the performance of our algorithm competitive with the fastest previous ones.

关键词： Rendering (computer graphics) Computer graphics systems engineering and theory Computed tomography Image processing Data engineering Coherence Sorting Hardware Data structures

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Kairos: An Architecture for Securing Authorship and Temporal Information of Provenance Data in Grid-Enabled Workflow Management systems

Kairos: An Architecture for Securing Authorship and Temporal...

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IEEE International Conference on e-Science and Grid Computing

作者： Luiz M.R. Gadelha Jr Marta Mattoso Computer and Systems Engineering Program-COPPE Federal University of Rio de Janeiro Rio de Janeiro Brazil

Secure provenance techniques are essential in generating trustworthy provenance records, where one is interested in protecting their integrity, confidentiality, and availability. In this work, we suggest an architecture to provide protection of authorship and temporal information in grid-enabled provenance systems. It can be used in the resolution of conflicting intellectual property claims, and in the reliable chronological reconstitution of scientific experiments. We observe that some techniques from public key infrastructures can be readily applied for this purpose. We discuss the issues involved in the implementation of such architecture and describe some experiments realized with the proposed techniques.

关键词： Workflow management software Protection Data security Information security Intellectual property Computer architecture Grid computing Digital signatures Distributed computing Mesh generation

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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

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.

关键词： Computational modeling Context Psychology Media Navigation

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Rebuilding games at runtime

Rebuilding games at runtime

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IEEE/ACM International Conference on Automated Software engineering - Workshops (ASE Workshops)

作者： Diego Castro Cláudia Werner COPPE/Computer Systems Engineering Program Federal University of Rio de Janeiro Rio de Janeiro Brazil

ISBN: (纸本)9781665411851

The gaming industry is growing over time, having a considerable amount of fans. Creating a game is a complex process that can take a long time until its release, causing a lot of anxiety for the game fan population. Some of these fans can not wait for the release of a specific game, creating their own versions of games. This process of creating games in an ad-hoc manner from others that already exist is called mod and can be compared to the concept of Software Reuse, where software is created from others. This work aims to increase the systematic of creating mods based on reuse concepts such as Product Line. In this paper, an initial prototype of a game created by applying Product Line concepts to generate new mods in a more systematic way is described.

关键词： Industries Fans Systematics Runtime Conferences Sociology Prototypes

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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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