IGOR GABRIEL ARAUJO DOS SANTOS (original) (raw)
Papers by IGOR GABRIEL ARAUJO DOS SANTOS
Revista Brasileira de Cancerologia, 2012
Introdução: A ansiedade no período pré-operatório é bastante comum. Incidência de ate 80% tem sid... more Introdução: A ansiedade no período pré-operatório é bastante comum. Incidência de ate 80% tem sido relatada na literatura, em pacientes adultos. Objetivo: Avaliar a influência da música na ansiedade e na dor, em pacientes com câncer de mama que se submeteram a cirurgia. Método: Trata-se de um ensaio clínico controlado, com randomização simples. As pacientes foram divididas nos grupos: Experimental (GE) e Controle (GC). A intervenção musical foi realizada com As quatro estações de Vivaldi. Todas as pacientes foram submetidas, no pré-operatório imediato, ao Inventário de Ansiedade Traço-Estado (IDATE -Estado), sendo verificados, também, os parâmetros fisiológicos (pressão arterial, temperatura, saturação sanguínea, frequência respiratória e cardíaca). No dia seguinte, foram aplicadas as escalas de dor, em ambos os grupos. Os dados foram analisados pelo software estatístico BioEstat, versão 5.0, com nível de significância estabelecido em 5,0%, sendo utilizado teste t-Student pareado. R...
![Research paper thumbnail of Avaliação da presença de sintomas depressivos entre usuários de plantão noturno, em unidade de emergência [Assessment to the presence of depressive symptoms among users nightshift at emergency room]](https://attachments.academia-assets.com/98003577/thumbnails/1.jpg)
](Revista Enfermagem Uerj, Sep 13, 2013
O objetivo desta pesquisa foi identificar a concepção de cuidado dos enfermeiros residentes de en... more O objetivo desta pesquisa foi identificar a concepção de cuidado dos enfermeiros residentes de enfermagem de um hospital universitário e verificar como eles correlacionam a prática com a teoria. Estudo descritivo e exploratório, desenvolvido com 25 residentes de enfermagem, do primeiro ano e do segundo ano, os quais desenvolviam suas atividades em hospital universitário, situado no município do Rio de Janeiro. Os dados foram coletados em 2008 por meio de entrevista semiestruturada e submetidos à análise de conteúdo, emergindo três categorias: Concepção do cuidar na perspectiva do residente de enfermagem; Prática versus fundamentos teóricos do cuidar; Teoria versus classificações diagnósticas: equívocos e conflitos. Conclui-se que os depoentes revelaram um cuidado baseado na concepção holística e na essência da profissão, no entanto percebe-se que existe um conflito entre fundamentos teóricos de enfermagem e classificação diagnóstica que necessita ser superado. Pa la vras-c ha ve : Cuidado; concepções teóricas; cuidado de enfermagem; enfermagem;
particular ao Evandro e ao Sidney pelo incentivo e pelo acolhimento em suas casas em Ribeirão Pre... more particular ao Evandro e ao Sidney pelo incentivo e pelo acolhimento em suas casas em Ribeirão Preto. E aos amigos que Campinas me deu, Beto e Augusto. Aos amigos da 46ª Turma de Enfermagem pelo prazer do nosso encontro, pela amizade e companheirismo, mesmo que separados pela distância e pelo tempo.
One of the main challenges in the field of Wireless Sensor Networks (WSN) is related to the secur... more One of the main challenges in the field of Wireless Sensor Networks (WSN) is related to the security of their nodes. This is because such nodes, called sensors, are arranged in unprotected areas where they are vulnerable to capture, reverse engineer and tamper with by malicious people (attackers). Once such sensors are captured, an attacker can distribute the software code or even use the code in his projects without being traceable. In this context we propose a "code obfuscation-based software watermarking framework" for protecting the authorship of the software embedded in the sensors, and thereby discouraging the theft of intellectual property. The proposed software watermarking framework is defined as a sequence of code obfuscations, which makes, simultaneously, the code more difficult to analyze and the watermark more difficult to be located and removed, because the watermark is interleaved with other software instructions. Experiments were performed for measuring the...
Agricultural Sciences, 2015
This study investigated the protective effects of secondary bacterial metabolites, produced by Ps... more This study investigated the protective effects of secondary bacterial metabolites, produced by Pseudomonas sp. (bacterium strain LN), on citrus canker disease caused by Xanthomonas axonopodis pv. citri (Xac 306). The LN bacteria strain was cultured in liquid medium and the supernatant free-cells was treated with methanol (AMF) and ethyl acetate (AEF), respectively, and then the extract was concentrated, filtrated, lyophilized and fractionated by vacuum liquid chromatography (VLC). After VLC, eight fractions were obtained. All fractions' activity against Xac 306 by agar well diffusion assay and minimum inhibitory concentration but in different concentrations were tested. Cytotoxicity effects were observed in all fractions in 50 µg•mL −1 concentration. The comet assay demonstrated that the fractions EAF, VLC2 and VLC3 presented no genotoxic effects at tested concentrations. In plants only VLC3 showed significant results (p < 0.05), reducing the incidence of citrus canker lesions.
Revista Pan-Amazônica de Saúde, 2011
A malária ocorre com maior frequência nos municípios do interior da Região Amazônica, sendo notif... more A malária ocorre com maior frequência nos municípios do interior da Região Amazônica, sendo notificados casos autóctones da doença em algumas capitais brasileiras. Este trabalho foi realizado objetivando descrever a incidência e a distribuição de casos autóctones de malária no Município de Rio Branco, capital do Estado do Acre. Trata-se de estudo retrospectivo, do tipo série histórica. Foram notificados 5.394 casos autóctones da doença em Rio Branco no período de 2003 a 2010. Houve predomínio de: infecção por Plasmodium vivax (3.713 casos, 73,9% do total); acometimento do sexo masculino (3.268 casos, 65,1% do total); e faixa etária de 10 a 19 anos (24,3% do total). As localidades rurais foram responsáveis por 3.252 (60,3%) casos, sendo o Projeto de Assentamento Dirigido Padre Peixoto (Linha 3 Gleba Z I) a área mais atingida pela doença. Na região urbana, os bairros Taquari e Centro (1º Distrito) foram os mais acometidos. Concluiu-se pela existência de uma tendência decrescente na incidência dos casos autóctones de malária em Rio Branco, além de uma mudança do perfil da infecção, com redução de casos originários das localidades rurais, que foram suplantados pelos ocorridos em localidades periurbanas.
Lecture Notes in Computer Science, 2014
Large Scale Network-Centric Distributed Systems, 2013
This chapter provides an overview of the challenges faced in the design of new techniques for ena... more This chapter provides an overview of the challenges faced in the design of new techniques for enabling new decentralized solutions of large-scale wireless sensor networks (WSNs) in the structural health monitoring (SHM) domain. It introduces the definition of SHM along with the concept of WSNs. The chapter discusses the concepts of SHM and WSNs apart from one another. The chapter explains existent solutions employing WSNs in the context of SHM. It focuses on SHM techniques based on the use of accelerometers; but in further investigations, this classification can be expanded to works that use other kinds of sensing devices, for example, strain gauges, following the same logic of higher degrees of decentralization and in-network processing. The concept of ?>generations of sensor networks for SHM ?> was used for such classification. Each generation is presented by describing respective examples of works found in the current literature.
Pensar a Prática, 2014
Resumo Este estudo tem por objetivo analisar a relação entre mídia e esporte no processo de popul... more Resumo Este estudo tem por objetivo analisar a relação entre mídia e esporte no processo de popularização do MMA na sociedade, num contexto que tem como ordem econômico-social o capitalismo. Inicialmente, buscou-se estabelecer uma discussão com a literatura, no sentido de compreender o fenômeno esportivo e como ele se configura na sociedade contemporânea. Essa etapa, eminentemente teórica, forneceu subsídios para elucidar alguns questionamentos que permeiam o veemente crescimento do fenômeno MMA e sua constante evidência nos meios de comunicação de massa. Como resultado, verificou-se que a popularização do MMA na sociedade está atrelada à persuasão da mídia, mediante o processo de mercadorização esportiva. Palavras chave: Mídia. MMA. Mercadorização Esportiva. Popularização.
IFIP Advances in Information and Communication Technology, 2010
Wireless Sensor Networks have critical resource constraints and minimizing resources usage is cru... more Wireless Sensor Networks have critical resource constraints and minimizing resources usage is crucial to extend the network lifetime. Energy saving in WSNs can be achieved through several techniques, such as topology control and clustering, to provide a longer lifetime and scalability to the network. In this paper we propose a semantic clustering model based on a fuzzy inference system to find out the semantic neighborhood relationships in the network. As a case study we describe the structural health monitoring domain application which has been used to illustrate and verify the proposed model.
Transactions on Emerging Telecommunications Technologies, 2014
A research field that makes use of information and communication technologies to provide solution... more A research field that makes use of information and communication technologies to provide solutions to contemporaneous environmental challenges such as greenhouse gas emissions and global warming is the 'smart building' field. The use of wireless sensor and actuator networks (WSANs) emerges as an alternative for the use of information and communication technologies in the smart buildings. However, most of smart building applications make use of centralised architectures with sensing nodes transmitting messages to a base station wherein, effectively, the control and decision processes happen. In this context, we present CONDE, a decentralised CONtrol and DEcision-making system for smart building applications using WSANs. CONDE main contributions are as follows: (i) the decentralisation of the control and decision-making processes among WSAN nodes, saving energy of both the WSAN and the building; (ii) the integration of applications through sharing the sensed data and chaining decisions between applications within the WSAN, also saving energy of both the WSAN and the building; and (iii) the provision of a consensual multilevel decision that takes into account the cooperation among nodes to have a broader view of the monitored building. Performed experiments have shown CONDE gains in terms of the following: (i) response time; (ii) system efficiency; and (iii) energy savings from the network and the building.
37th Annual IEEE Conference on Local Computer Networks, 2012
ABSTRACT This work presents an adaptation (and enhancement) of a well-known fusion technique in o... more ABSTRACT This work presents an adaptation (and enhancement) of a well-known fusion technique in order to deal with multiple applications simultaneously in a context of Shared Sensor and Actuator Networks (SSAN). SSAN allow the sensing infrastructure to be shared among multiple applications that can potentially belong to different users instead of assuming an application-specific network design. We also present simulation and tests conducted with the proposed solution on real nodes to validate our proposal.
2013 IEEE/ACM 6th International Conference on Utility and Cloud Computing, 2013
ABSTRACT Existing Scientific Workflow Management Systems (i.e. SWfMS) effectively support workflo... more ABSTRACT Existing Scientific Workflow Management Systems (i.e. SWfMS) effectively support workflows that do not need dynamic changes at runtime. SWfMS execute workflows by providing process management, provenance data and distributed execution on clusters and clouds. However, the support for dynamic changes in workflows is still an open, yet important, problem. For example, when the program associated to an activity of the workflow is taking more time than expected to produce results or if the results do not comply with some quality criteria, the scientist may want to try an alternative algorithm implementation. However, scientists may not want to re-execute the entire workflow for each change they make in the workflow structure. Alternatively, changing the structure of the workflow dynamically (i.e. change the programs associated with workflow activities) can improve the workflow execution without restarting the execution. In this paper, we propose DynAdapt, a dynamic approach that allows scientist to perform structural changes of the workflow specification at runtime. We evaluated DynAdapt using SciPhy, a large-scale bioinformatics workflow, and results show up to 40% of execution improvement.
Information Fusion, 2014
Structural Health Monitoring (SHM) has been proving to be a suitable application domain for wirel... more Structural Health Monitoring (SHM) has been proving to be a suitable application domain for wireless sensor networks, whose techniques attempt to autonomously evaluate the integrity of structures, occasionally aiming at detecting and localizing damage. In this paper, we propose a localized algorithm supported by multilevel information fusion techniques to enable detection, localization and extent determination of damage sites using the resource constrained environment of a wireless sensor network. Each node partakes in different network tasks and has a localized view of the whole situation, so collaboration mechanisms and multilevel information fusion techniques are key components of this proposal to efficiently achieve its goal. Experimental results with the MICAz mote platform showed that the algorithm performs well in terms of network resources utilization.
Empirical Software Engineering, 2012
In this article, we present a systematic mapping study of replications in software engineering. T... more In this article, we present a systematic mapping study of replications in software engineering. The goal is to plot the landscape of current published replications of empirical studies in software engineering research. We applied the systematic review method to search and select published articles, and to extract and synthesize data from the selected articles that reported replications. Our search retrieved more than 16,000 articles, from which we selected 96 articles, reporting 133 replications performed between 1994 and 2010, of 72 original studies. Nearly 70 % of the replications were published after 2004 and 70 % of these studies were internal replications. The topics of software requirements, software construction, and software quality concentrated over 55 % of the replications, while software design, configuration management, and software tools and methods were the topics with the smallest number of replications. We conclude that the number of replications has grown in the last few years, but the absolute number of replications is still small, in particular considering the breadth of topics in software engineering. We still need incentives to perform external replications, better standards to report empirical studies and their replications, and collaborative research agendas that could speed up development and publication of replications.
Computational & Applied Mathematics, 2012
This paper presents the numerical analysis of the Nonlinear Subgrid Scale (NSGS) model for approx... more This paper presents the numerical analysis of the Nonlinear Subgrid Scale (NSGS) model for approximating singularly perturbed transport models. The NSGS is a free parameter subgrid stabilizing method that introduces an extra stability only onto the subgrid scales. This new feature comes from the local control yielded by decomposing the velocity field into the resolved and unresolved scales. Such decomposition is determined by requiring the minimum of the kinetic energy associated to the unresolved scales and the satisfaction of the resolved scale model problem at element level. The developed method is robust for a wide scope of singularly perturbed problems. Here, we establish the existence and uniqueness of the solution, and provide an a priori error estimate. Convergence tests on two-dimensional examples are reported.
CNS Spectrums, 2011
IntroductionThe dimensional approach of the obsessive-compulsive symptoms may help to find more h... more IntroductionThe dimensional approach of the obsessive-compulsive symptoms may help to find more homogeneous groups of patients. The brain derived neurotrophic factor (BDNF) may help to identify neurobiological differences between obsessive-compulsive symptom dimensions.MethodsWe compared serum BDNF (pg/μg) levels of 25 unmedicated patients meeting Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition criteria for obsessivecompulsive disorder (OCD) and 25 controls, using the Dimensional Yale‐Brown Obsessive‐Compulsive Scale, the Yale‐Brown Obsessive‐Compulsive Scale and the Beck's Anxiety and Depression Inventories.ResultsThere were no sociodemographic differences between the groups. The standard error of mean serum BDNF levels were reduced in unmedicated OCD patients (0.47+0.038) when compared to healthy controls (0.75+0.060) (P<.001). The patients with the presence of sex/religion obsessive-compulsive symptoms (OCS) dimension (P=.002), with chronic course of ...
Revista Brasileira de Cancerologia, 2012
Introdução: A ansiedade no período pré-operatório é bastante comum. Incidência de ate 80% tem sid... more Introdução: A ansiedade no período pré-operatório é bastante comum. Incidência de ate 80% tem sido relatada na literatura, em pacientes adultos. Objetivo: Avaliar a influência da música na ansiedade e na dor, em pacientes com câncer de mama que se submeteram a cirurgia. Método: Trata-se de um ensaio clínico controlado, com randomização simples. As pacientes foram divididas nos grupos: Experimental (GE) e Controle (GC). A intervenção musical foi realizada com As quatro estações de Vivaldi. Todas as pacientes foram submetidas, no pré-operatório imediato, ao Inventário de Ansiedade Traço-Estado (IDATE -Estado), sendo verificados, também, os parâmetros fisiológicos (pressão arterial, temperatura, saturação sanguínea, frequência respiratória e cardíaca). No dia seguinte, foram aplicadas as escalas de dor, em ambos os grupos. Os dados foram analisados pelo software estatístico BioEstat, versão 5.0, com nível de significância estabelecido em 5,0%, sendo utilizado teste t-Student pareado. R...
Revista Enfermagem Uerj, Sep 13, 2013
O objetivo desta pesquisa foi identificar a concepção de cuidado dos enfermeiros residentes de en... more O objetivo desta pesquisa foi identificar a concepção de cuidado dos enfermeiros residentes de enfermagem de um hospital universitário e verificar como eles correlacionam a prática com a teoria. Estudo descritivo e exploratório, desenvolvido com 25 residentes de enfermagem, do primeiro ano e do segundo ano, os quais desenvolviam suas atividades em hospital universitário, situado no município do Rio de Janeiro. Os dados foram coletados em 2008 por meio de entrevista semiestruturada e submetidos à análise de conteúdo, emergindo três categorias: Concepção do cuidar na perspectiva do residente de enfermagem; Prática versus fundamentos teóricos do cuidar; Teoria versus classificações diagnósticas: equívocos e conflitos. Conclui-se que os depoentes revelaram um cuidado baseado na concepção holística e na essência da profissão, no entanto percebe-se que existe um conflito entre fundamentos teóricos de enfermagem e classificação diagnóstica que necessita ser superado. Pa la vras-c ha ve : Cuidado; concepções teóricas; cuidado de enfermagem; enfermagem;
particular ao Evandro e ao Sidney pelo incentivo e pelo acolhimento em suas casas em Ribeirão Pre... more particular ao Evandro e ao Sidney pelo incentivo e pelo acolhimento em suas casas em Ribeirão Preto. E aos amigos que Campinas me deu, Beto e Augusto. Aos amigos da 46ª Turma de Enfermagem pelo prazer do nosso encontro, pela amizade e companheirismo, mesmo que separados pela distância e pelo tempo.
One of the main challenges in the field of Wireless Sensor Networks (WSN) is related to the secur... more One of the main challenges in the field of Wireless Sensor Networks (WSN) is related to the security of their nodes. This is because such nodes, called sensors, are arranged in unprotected areas where they are vulnerable to capture, reverse engineer and tamper with by malicious people (attackers). Once such sensors are captured, an attacker can distribute the software code or even use the code in his projects without being traceable. In this context we propose a "code obfuscation-based software watermarking framework" for protecting the authorship of the software embedded in the sensors, and thereby discouraging the theft of intellectual property. The proposed software watermarking framework is defined as a sequence of code obfuscations, which makes, simultaneously, the code more difficult to analyze and the watermark more difficult to be located and removed, because the watermark is interleaved with other software instructions. Experiments were performed for measuring the...
Agricultural Sciences, 2015
This study investigated the protective effects of secondary bacterial metabolites, produced by Ps... more This study investigated the protective effects of secondary bacterial metabolites, produced by Pseudomonas sp. (bacterium strain LN), on citrus canker disease caused by Xanthomonas axonopodis pv. citri (Xac 306). The LN bacteria strain was cultured in liquid medium and the supernatant free-cells was treated with methanol (AMF) and ethyl acetate (AEF), respectively, and then the extract was concentrated, filtrated, lyophilized and fractionated by vacuum liquid chromatography (VLC). After VLC, eight fractions were obtained. All fractions' activity against Xac 306 by agar well diffusion assay and minimum inhibitory concentration but in different concentrations were tested. Cytotoxicity effects were observed in all fractions in 50 µg•mL −1 concentration. The comet assay demonstrated that the fractions EAF, VLC2 and VLC3 presented no genotoxic effects at tested concentrations. In plants only VLC3 showed significant results (p < 0.05), reducing the incidence of citrus canker lesions.
Revista Pan-Amazônica de Saúde, 2011
A malária ocorre com maior frequência nos municípios do interior da Região Amazônica, sendo notif... more A malária ocorre com maior frequência nos municípios do interior da Região Amazônica, sendo notificados casos autóctones da doença em algumas capitais brasileiras. Este trabalho foi realizado objetivando descrever a incidência e a distribuição de casos autóctones de malária no Município de Rio Branco, capital do Estado do Acre. Trata-se de estudo retrospectivo, do tipo série histórica. Foram notificados 5.394 casos autóctones da doença em Rio Branco no período de 2003 a 2010. Houve predomínio de: infecção por Plasmodium vivax (3.713 casos, 73,9% do total); acometimento do sexo masculino (3.268 casos, 65,1% do total); e faixa etária de 10 a 19 anos (24,3% do total). As localidades rurais foram responsáveis por 3.252 (60,3%) casos, sendo o Projeto de Assentamento Dirigido Padre Peixoto (Linha 3 Gleba Z I) a área mais atingida pela doença. Na região urbana, os bairros Taquari e Centro (1º Distrito) foram os mais acometidos. Concluiu-se pela existência de uma tendência decrescente na incidência dos casos autóctones de malária em Rio Branco, além de uma mudança do perfil da infecção, com redução de casos originários das localidades rurais, que foram suplantados pelos ocorridos em localidades periurbanas.
Lecture Notes in Computer Science, 2014
Large Scale Network-Centric Distributed Systems, 2013
This chapter provides an overview of the challenges faced in the design of new techniques for ena... more This chapter provides an overview of the challenges faced in the design of new techniques for enabling new decentralized solutions of large-scale wireless sensor networks (WSNs) in the structural health monitoring (SHM) domain. It introduces the definition of SHM along with the concept of WSNs. The chapter discusses the concepts of SHM and WSNs apart from one another. The chapter explains existent solutions employing WSNs in the context of SHM. It focuses on SHM techniques based on the use of accelerometers; but in further investigations, this classification can be expanded to works that use other kinds of sensing devices, for example, strain gauges, following the same logic of higher degrees of decentralization and in-network processing. The concept of ?>generations of sensor networks for SHM ?> was used for such classification. Each generation is presented by describing respective examples of works found in the current literature.
Pensar a Prática, 2014
Resumo Este estudo tem por objetivo analisar a relação entre mídia e esporte no processo de popul... more Resumo Este estudo tem por objetivo analisar a relação entre mídia e esporte no processo de popularização do MMA na sociedade, num contexto que tem como ordem econômico-social o capitalismo. Inicialmente, buscou-se estabelecer uma discussão com a literatura, no sentido de compreender o fenômeno esportivo e como ele se configura na sociedade contemporânea. Essa etapa, eminentemente teórica, forneceu subsídios para elucidar alguns questionamentos que permeiam o veemente crescimento do fenômeno MMA e sua constante evidência nos meios de comunicação de massa. Como resultado, verificou-se que a popularização do MMA na sociedade está atrelada à persuasão da mídia, mediante o processo de mercadorização esportiva. Palavras chave: Mídia. MMA. Mercadorização Esportiva. Popularização.
IFIP Advances in Information and Communication Technology, 2010
Wireless Sensor Networks have critical resource constraints and minimizing resources usage is cru... more Wireless Sensor Networks have critical resource constraints and minimizing resources usage is crucial to extend the network lifetime. Energy saving in WSNs can be achieved through several techniques, such as topology control and clustering, to provide a longer lifetime and scalability to the network. In this paper we propose a semantic clustering model based on a fuzzy inference system to find out the semantic neighborhood relationships in the network. As a case study we describe the structural health monitoring domain application which has been used to illustrate and verify the proposed model.
Transactions on Emerging Telecommunications Technologies, 2014
A research field that makes use of information and communication technologies to provide solution... more A research field that makes use of information and communication technologies to provide solutions to contemporaneous environmental challenges such as greenhouse gas emissions and global warming is the 'smart building' field. The use of wireless sensor and actuator networks (WSANs) emerges as an alternative for the use of information and communication technologies in the smart buildings. However, most of smart building applications make use of centralised architectures with sensing nodes transmitting messages to a base station wherein, effectively, the control and decision processes happen. In this context, we present CONDE, a decentralised CONtrol and DEcision-making system for smart building applications using WSANs. CONDE main contributions are as follows: (i) the decentralisation of the control and decision-making processes among WSAN nodes, saving energy of both the WSAN and the building; (ii) the integration of applications through sharing the sensed data and chaining decisions between applications within the WSAN, also saving energy of both the WSAN and the building; and (iii) the provision of a consensual multilevel decision that takes into account the cooperation among nodes to have a broader view of the monitored building. Performed experiments have shown CONDE gains in terms of the following: (i) response time; (ii) system efficiency; and (iii) energy savings from the network and the building.
37th Annual IEEE Conference on Local Computer Networks, 2012
ABSTRACT This work presents an adaptation (and enhancement) of a well-known fusion technique in o... more ABSTRACT This work presents an adaptation (and enhancement) of a well-known fusion technique in order to deal with multiple applications simultaneously in a context of Shared Sensor and Actuator Networks (SSAN). SSAN allow the sensing infrastructure to be shared among multiple applications that can potentially belong to different users instead of assuming an application-specific network design. We also present simulation and tests conducted with the proposed solution on real nodes to validate our proposal.
2013 IEEE/ACM 6th International Conference on Utility and Cloud Computing, 2013
ABSTRACT Existing Scientific Workflow Management Systems (i.e. SWfMS) effectively support workflo... more ABSTRACT Existing Scientific Workflow Management Systems (i.e. SWfMS) effectively support workflows that do not need dynamic changes at runtime. SWfMS execute workflows by providing process management, provenance data and distributed execution on clusters and clouds. However, the support for dynamic changes in workflows is still an open, yet important, problem. For example, when the program associated to an activity of the workflow is taking more time than expected to produce results or if the results do not comply with some quality criteria, the scientist may want to try an alternative algorithm implementation. However, scientists may not want to re-execute the entire workflow for each change they make in the workflow structure. Alternatively, changing the structure of the workflow dynamically (i.e. change the programs associated with workflow activities) can improve the workflow execution without restarting the execution. In this paper, we propose DynAdapt, a dynamic approach that allows scientist to perform structural changes of the workflow specification at runtime. We evaluated DynAdapt using SciPhy, a large-scale bioinformatics workflow, and results show up to 40% of execution improvement.
Information Fusion, 2014
Structural Health Monitoring (SHM) has been proving to be a suitable application domain for wirel... more Structural Health Monitoring (SHM) has been proving to be a suitable application domain for wireless sensor networks, whose techniques attempt to autonomously evaluate the integrity of structures, occasionally aiming at detecting and localizing damage. In this paper, we propose a localized algorithm supported by multilevel information fusion techniques to enable detection, localization and extent determination of damage sites using the resource constrained environment of a wireless sensor network. Each node partakes in different network tasks and has a localized view of the whole situation, so collaboration mechanisms and multilevel information fusion techniques are key components of this proposal to efficiently achieve its goal. Experimental results with the MICAz mote platform showed that the algorithm performs well in terms of network resources utilization.
Empirical Software Engineering, 2012
In this article, we present a systematic mapping study of replications in software engineering. T... more In this article, we present a systematic mapping study of replications in software engineering. The goal is to plot the landscape of current published replications of empirical studies in software engineering research. We applied the systematic review method to search and select published articles, and to extract and synthesize data from the selected articles that reported replications. Our search retrieved more than 16,000 articles, from which we selected 96 articles, reporting 133 replications performed between 1994 and 2010, of 72 original studies. Nearly 70 % of the replications were published after 2004 and 70 % of these studies were internal replications. The topics of software requirements, software construction, and software quality concentrated over 55 % of the replications, while software design, configuration management, and software tools and methods were the topics with the smallest number of replications. We conclude that the number of replications has grown in the last few years, but the absolute number of replications is still small, in particular considering the breadth of topics in software engineering. We still need incentives to perform external replications, better standards to report empirical studies and their replications, and collaborative research agendas that could speed up development and publication of replications.
Computational & Applied Mathematics, 2012
This paper presents the numerical analysis of the Nonlinear Subgrid Scale (NSGS) model for approx... more This paper presents the numerical analysis of the Nonlinear Subgrid Scale (NSGS) model for approximating singularly perturbed transport models. The NSGS is a free parameter subgrid stabilizing method that introduces an extra stability only onto the subgrid scales. This new feature comes from the local control yielded by decomposing the velocity field into the resolved and unresolved scales. Such decomposition is determined by requiring the minimum of the kinetic energy associated to the unresolved scales and the satisfaction of the resolved scale model problem at element level. The developed method is robust for a wide scope of singularly perturbed problems. Here, we establish the existence and uniqueness of the solution, and provide an a priori error estimate. Convergence tests on two-dimensional examples are reported.
CNS Spectrums, 2011
IntroductionThe dimensional approach of the obsessive-compulsive symptoms may help to find more h... more IntroductionThe dimensional approach of the obsessive-compulsive symptoms may help to find more homogeneous groups of patients. The brain derived neurotrophic factor (BDNF) may help to identify neurobiological differences between obsessive-compulsive symptom dimensions.MethodsWe compared serum BDNF (pg/μg) levels of 25 unmedicated patients meeting Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition criteria for obsessivecompulsive disorder (OCD) and 25 controls, using the Dimensional Yale‐Brown Obsessive‐Compulsive Scale, the Yale‐Brown Obsessive‐Compulsive Scale and the Beck's Anxiety and Depression Inventories.ResultsThere were no sociodemographic differences between the groups. The standard error of mean serum BDNF levels were reduced in unmedicated OCD patients (0.47+0.038) when compared to healthy controls (0.75+0.060) (P<.001). The patients with the presence of sex/religion obsessive-compulsive symptoms (OCS) dimension (P=.002), with chronic course of ...