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检索条件"机构=Post-Graduation Program in Informatics"

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Analyses of Photovoltaic Systems Performance with Fuzzy Inference Systems and Bayesian Networks

Analyses of Photovoltaic Systems Performance with Fuzzy Infe...

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Power Electronics and Control (SEPOC), Seminar on

作者： Nicole Polityto Cremasco Myriam Regattieri De Biase da Silva Delgado Jair Urbanetz Junior Luiz Ledo Mota Melo Jorge Assade Leludak Keiko Verônica Ono Fonseca Program of Post-Graduation of Electrical Engineering and Industrial Informatics(CPGEI) of Federal University of Technology of Paraná(UTFPR) Program of Post-Graduation of Electrical Engineering and Industrial Informatics(CPGEI) of the Federal University of Technology of Paraná(UTFPR) Program of Post-Graduation in Energy Systems of Federal University of Technology of Paraná(UTFPR Department of Electrical Engineering (DAELT)) Federal University of Technology of Paraná(UTFPR) Curitiba Brazil

Renewable energy sources have been increasingly targeted as an alternative for reducing fossil fuel emissions. This scenario requires a better understanding of energy systems' performance and limitations, notably using photovoltaic setups under diverse meteorological conditions and determining device measurement uncertainties. Accordingly, this study conducts a performance evaluation of a photovoltaic system of copper, indium, and gallium (di)selenide technology. It compares the results provided by a reference normalized equation with two interpretable artificial intelligence techniques, Fuzzy Inference System and Bayesian Networks, when temperature is also considered. In the experiments, the study found significant percentage differences between the normalization procedure and the fuzzy system on days with lower irradiation values. On the other hand, the results provided by Bayesian networks presented lower difference percentages in relation to the normalization equation values.

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A Study of the Effect of Illumination Conditions and Color Spaces on Skin Segmentation

A Study of the Effect of Illumination Conditions and Color S...

引用

Brazilian Symposium on Computer Graphics and Image Processing (SIBGRAPI)

作者： Diogo Kuiaski Hugo Vieira Neto Gustavo Borba Humberto Gamba Post-graduation Program in Electrical Engineering and Industrial Informatics Federal University of Technology of Paraná (UTFPR) Curitiba Parana Brazil

This work aims at investigating the influence of luminance information and environment illumination on skin classification. We explore Bayesian approaches to perform automatic classification of human skin pixels on digital images, using color features as input. Two probabilistic skin color models were built on different color spaces (RGB, normalized RG, HSI, HS, YCbCr and CbCr) and tested in a task of automatic pixel classification into skin and non-skin. Analyses of classification performance were done by presenting an illumination controlled image database containing images acquired in four different illumination conditions (shadow, sun, incandescent and fluorescent lights) to these classifiers. Our experiments show that building probabilistic skin color models using the CbCr color space generally improves performance of the classifiers and that best performance is achieved in shadow illumination.

关键词： Lighting Skin Image segmentation Bayesian methods Humans Pixel Digital images Roentgenium Automatic testing Image analysis

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Proposal and development of the Web services input validation model

Proposal and development of the Web services input validatio...

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IEEE Symposium on Network Operations and Management

作者： Rafael Bosse Brinhosa Carla Merkle Westphall Carlos Becker Westphall Post Graduation Program in Computer Science (PPGCC) Department of Informatics and Statistics (INE) Federal University of Santa Catarina Florianopolis Brazil

The SOA architecture primarily based on Web services is experiencing a steady adoption, although its growth was lower than expected when it was launched, mainly because of security related concerns. Web services inherited many well-known security problems of Web applications and brought new ones. Major data breaches today are consequences of bad input validation at the application level. This paper presents a way to implement an input validation model for Web services which can be used to prevent cross-site scripting and SQL injection through the use of predefined models which specify valid inputs. The proposed WSIVM (Web Services Input Validation Model) consists of an XML schema, an XML specification, and a module for performing input validation according to the schema. A case study showing the effectiveness and performance of this mechanism is also presented.

关键词： Security Service oriented architecture XML Simple object access protocol Standards

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Evaluation of Game-Based Learning Approaches through Digital Serious Games in Computer Science Higher Education: A Systematic Mapping

Evaluation of Game-Based Learning Approaches through Digital...

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Brazilian Symposium on Games and Digital Entertainment (SBGAMES)

作者： Aliane Loureiro Krassmann Leo Natan Paschoal Andressa Falcade Roseclea Duarte Medina Post-graduation Program on Informatics Federal University of Santa Maria (UFSM) Santa Maria Brazil Computer Science Graduation Cruz Alta's University (UNICRUZ) Cruz Alta Brazil

ISBN: (纸本)9781467388443

This paper conducts a Systematic Mapping in order to outline a current overview of digital serious games applications' evaluations for game-based learning purposes on computer science higher education. The search was performed on informatics' area electronic databases, resulting in 2,174 publications initially found. After sorting through the application of inclusion and exclusion criteria, remained 59. In the final phase, after thorough reading the extracted publications, has come up to 10 papers. The results reveal different practical approaches of digital serious games' applications evaluations that assess its different aspects' influence on students.

关键词： Games Education Computer science Systematics informatics Electronic mail Databases

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An object oriented framework for task scheduling

An object oriented framework for task scheduling

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Technology of Object-Oriented Languages and Systems (TOOLS)

作者： I.M.S. Gimenes S.A. Tanaka J.P.M. de Oliveira Department of Informatics Joint supervisor of the PPGC UFRGS Universidade Estatual de Maringá Department of Informatics PPGC UFRGS CESULON Program of Post Graduation in Computer Science PPGC Institute of Informatics-UFRGS

This paper presents an object oriented framework for task scheduling. This framework can be used in domains such as process-centred software engineering environments, workflow management systems or project management systems. The framework was conceived based on both current methods for the development of frameworks and an existing architectural pattern for process managers. A prototype of the framework was developed using the Java language. The lessons learnt show the experience of extracting a framework from well-known applications that can be reused in practical domains. Thus, this work contributes not only in the production of a framework but also giving insights in the application of novel techniques to the development of frameworks.

关键词： Application software informatics Environmental management Engineering management Software engineering Processor scheduling Electrical capacitance tomography Production Software quality Automation

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A Genetic Algorithm for the Selection of Features Used in the Prediction of Protein Function

A Genetic Algorithm for the Selection of Features Used in th...

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IEEE Symposium on Bioinformatics and Bioengineering (BIBE)

作者： Larissa Fernandes Leijôto Thiago Assis De Oliveira Rodrigues Luis Enrique Záratey Cristiane Neri Nobre Pontificia Universidade Catolica de Minas Gerais Belo Horizonte MG BR Post-Graduation Program in Inf. Pontificia Universidade Catolica de Minas Gerais Belo Horizonte MG BR Post-Graduation Program in Informatics Pontifical Catholic University of Minas Gerais Brazil

Proteins are macromolecules that have a high molecular weight, and make up, along with water, most of the composition of cells. The functions they perform are extremely important, such as the catalysis of biochemical reactions, cytoskeleton formation, and the transportation and storage of substances. With the completion of genome sequencing, protein discovery has been growing exponentially, and the laboratory methods for determining their functions have not been able to keep up with this growth. Due to this fact, it is necessary to develop methods to aid in this function discovery process. Thus, this work proposes a physical-chemical feature selection methodology calculated by means of the structures that compose the proteins. This stage has the goal of choosing a feature subset from all available features. A feature is considered relevant if it can be used by the machine to create a separation capability between the different protein classes. To select this subset, we proposed the use of a simple genetic algorithm. The results obtained with the proposed methodology were superior to those found in the literature, reaching a precision of 71% and a sensitivity of 68%.

关键词： Proteins Support vector machines Amino acids Genetic algorithms Sensitivity Feature extraction Databases

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Universal design for learning and diversity in elementary school: Experience report 6

Universal design for learning and diversity in elementary sc...

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6th Iberoamerican Conference of Computer Human Interaction, HCI 2020

作者： Martins, Valéria Farinazzo Ribeiro, Glaucia Roxo da Costa, Mariana Revoredo Pereira de la Higuera Amato, Cibelle Albuquerque Mackenzie Presbyterian University Computing and Informatics Department Rua da Consolação 930 São PauloCEP 01302-000 Brazil Mackenzie Presbyterian University Post-graduation Program in Developmental Disorders Rua da Consolação 930 São PauloCEP 01302-000 Brazil

As the Information Technologies and Communication (ITCs) are to be seen as an important resource in classrooms at all levels of learning, it is necessary to think about how to ensure that these ITCs meet the needs of diverse learners. In this article, we are introduced to the Universal Design for Learning (UDL), which was used to develop and to refine a digital didactic material based on a printed book used in more than 100 Brazilian schools. A case study was conducted in a classroom of the first grade of elementary school to verify the benefits and the difficulties in implementing such an approach. The results of this experiment are presented in this article. Copyright © 2020 for this paper by its authors. Use permitted under Creative Commons License Attribution 4.0 International (CC BY 4.0).

关键词： E-learning

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Data Mining applied to the navigation task in autonomous robots

Data Mining applied to the navigation task in autonomous rob...

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IEEE Symposium on Computers and Communications (ISCC)

作者： Carlos Fransley Scatambulo Costa Eduardo Alexandre Franciscon UEM State University of Maringá Maringa PR Brazil Program of Post-Graduation in Informatics (PPGIA) Pontifical Catholic University of Paraná Curitiba PR Brazil

ISBN: (数字)9781728180861

ISBN: (纸本)9781728180878

This paper reports the results of the classifications algorithms used, in data mining, for the creation of a navigation model applied to an autonomous robot to perform the task of wall-following. The goal is to make the robotic vehicle capable of moving, guiding and making decisions autonomously, avoiding collisions, using the smallest resources set as possible. A simulator was used to develop a test environment, the robot vehicle and simulate the proposed navigation system. The results suggest that the J48 (C4.5) classification algorithm obtained the most satisfactory results, generating a model with high degree confidence in decision making.

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Semi-automatic Follow-Up of Graduates

Semi-automatic Follow-Up of Graduates

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Computer Science Society (SCCC) International Conference Chilean FLAGGED

作者： Diego Fialho Rodrigues Alcione de Paiva Oliveira Jugurta Lisboa Filho Alexandra Moreira Department of Informatics Federal University of Viçosa Vicosa Brazil Post-Graduation Program in Linguistics Federal University of Juiz de Fora Juiz de Fora Brazil

Many institutions needs to gather and store information about people connected to their activities. An automated system to accomplish this task needs to overcome several challenges: collect information on textual and semi-structured textual databases, execute textual inferences, identify individuals, integrate distributed information, etc. Multiagent systems may help solve these problems gradually and scalably. This article describes the design and implementation of a Multiagent system that collects public information about graduates gathered from a mailing list.

关键词： Ontologies Semantics Companies Multi-agent systems Educational institutions Monitoring Databases

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Performance Evaluation of Apache Hadoop Benchmarks under a Dynamic Checkpointing Mechanism

Performance Evaluation of Apache Hadoop Benchmarks under a D...

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Computer Science Society (SCCC) International Conference Chilean FLAGGED

作者： Paulo Vinicius Cardoso Patricia Pitthan Barcelos Post Graduation Program in Informatics Federal University of Santa Maria Santa Maria RS Brazil Computing Systems Laboratory Federal University of Santa Maria Santa Maria RS Brazil

ISBN: (纸本)9781538692349;9781538692332

The increasingly robust High Performance Computing (HPC) systems have promoted many researches on fault tolerance mechanisms. However, the efficiency of these techniques is an important challenge, as the data and resources demand is also getting higher. in this work, we presents how the framework Apache Hadoop implements the Checkpoint and Recovery technique for fault tolerance providing on its distributed file system (Hadoop Distributed File System). The demand of large amounts of data from all applications supported by Hadoop framework can compromise the mechanism efficiency, once its configurations attributes are defined statically. So we present a dynamic configuration mechanism to checkpoint for Apache Hadoop through a resource monitoring, whose goal is to make the Hadoop checkpoint adaptable. The proposed mechanism is then evaluated and submitted to performance tests.

关键词： Cluster computing Fault tolerance Fault tolerant systems Monitoring Heart beat File systems

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