SBC Research Papers - Academia.edu (original) (raw)

- by
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- Computational Mechanics, Statistical Analysis, Structure Analysis, Cognitive Ability

This paper shows an example of how role playing games can be used for two complementary purposes: to help at extracting the expertise of social actors, but also to support their participation in decision making. These two objectives correspond, respectively, to the 2nd grand challenge (computational modeling of complex systems) and to the 4th one (participatory access to knowledge). Our approach combines distributed role playing, geographic information systems, support for player negotiations and insertion of various types of artificial agents. We are exploring it in the context of participatory management of protected areas, for biodiversity conservation and social inclusion. SBC 2008 1

- by Diana Adamatti
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- Decision Making, Social Inclusion, Role-playing Game Theory, Complex System

Z -source inverters have been recently proposed as an alternative power conversion concept as they have both voltage buck and boost capabilities. These inverters use a unique impedance network, coupled between the power source and converter circuit, to provide both voltage buck and boost properties, which cannot be achieved with conventional voltage source and current source inverters. To facilitate understanding of Z -source inverter, this paper presents a detailed analysis, showing design of impedance network, implementation of simple Boost control PWM technique and simulation of Z -source inverter for different values of modulation indices.

- by MALA UMA
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- Electrical Engineering, Z Source Inverter, SBC

Existen muchas razones para que las empresas se embarquen en la migración a troncales SIP con Session Border Controllers: reducción de los costes de comunicación, mayor fiabilidad, mayor velocidad en la introducción de nuevos servicios,... more

- by Ramon Millan
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- Voip, VOIP security, SBC, PBX SIP Trunk

The auditory experience is crucial for the normal development and maturation of brain structure and the maintenance of the auditory pathways. The specific aims of this review are (i) to provide a brief background of the synaptic morphology of the endbulb of Held in hearing and deaf animals; (ii) to argue the importance of this large synaptic ending in linking neural activity along ascending pathways to environmental acoustic events; (iii) to describe how the re-introduction of electrical activity changes this synapse; and (iv) to examine how changes at the endbulb synapse initiate trans-synaptic changes in ascending auditory projections to the superior olivary complex, the inferior complex, and the auditory cortex.

- by David Ryugo
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- Acoustics, Hearing, Brain, Vertebrates
- by dung tien
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- Computer Science, Computer Engineering, GE, Le

The Data Mining process may help specialists on decision making by applying patterns extraction techniques based on attribute-value tables. An automatic medical report information mapping method is being developed intending to reduce the necessary time of the process and to avoid possible subjectivity on the manual information mapping. This work presents a broad case study about this method using information from 100 colonoscopy medical reports and on 609 upper digestive endoscopy medical reports, from which 82% and 100% were, respectively, automatically mapped.

- by Newton Spolaôr
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- Decision Making, Data Mining, Case Study, SBC

A social network is a graph where people or organizations (depending on the application) are represented as nodes connected by edges that can refer to either tight social bonds or some common, shared aspect. The graph structure analysis and the statistical analysis of specific node/edge attributes can reveal important individuals, relationships, and clusters. New information continues to be collected and stored, and size and complexity of the semantic graphs overwhelm the human cognitive abilities. Hence, it is necessary to improve the computational mechanisms to analyze such volume of data. In this paper, we focus on analyzing the information from social networks, extracting relevant knowledge, and visualizing the facts resultant from the analysis. Resumo. Uma rede social é um grafo onde pessoas ou organizações (dependendo da aplicação) são representadas por nodos conectados por arestas as quais podem corresponder tanto a fortes relacionamentos sociais como ao compartilhamento de alguma característica. A análise da estrutura desse grafo, assim como a análise estatística dos atributos dos nodos e/ou das arestas pode revelar indivíduos/organizações importantes, relacionamentos especiais e grupos. Enquanto novas informações continuam a ser coletadas e armazenadas, e o tamanho e a complexidade dos grafos semânticos sobrepujam a capacidade cognitiva humana, é necessário melhorar a habilidade de analisar tais volumes de dados. Este artigo focaliza a análise da informação presente nas redes sociais, a extração de conhecimento a partir de grafos e a visualização de fatos decorrentes dessa análise.

- by Mirella Moro
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- Computational Mechanics, Statistical Analysis, Structure Analysis, Cognitive Ability

This chapter presents some interaction techniques traditionally used in Virtual Reality environments. Beyond, some of these could be used in Augmented Reality ones. As Augmented Reality systems emerge, specially tailored techniques become... more

- by Veronica Teichrieb
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- SBC

The high churn and low bandwidth characteristics of peer-to-peer (P2P) backup systems make recovery a time consuming activity that increases system's outage. This is especially disturbing from the user perspective, because during outage the user is prevented from carrying out useful work. Nevertheless, at any given time, a user typically requires only a small fraction of her data to continue working. If the backup system is able to quickly recover such files, then the system's outage can be greatly reduced, even if a large portion of the data lost is still being recovered. In this paper, we evaluate the use of a file system working set model to support efficient recovery of a P2P backup system. By exploiting a simple LRU-like working set model, we have designed a recovery mechanism that substantially reduces outage and allows the user to return faster to work. The simulations we have performed show that even this simple model is able to reduce the outage by as much as 80%, when compared to the state-ofpractice in P2P backup recovery. SBC 2008

- by Francisco Vilar Brasileiro
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- Peer to Peer, File System, SBC

Societal interfaces are advanced approaches of interaction particularly developed to handle or resolve specific social problems and thus constitute a socially and ecologically more sustainable society and improve quality of life. In this paper we present the concept of societal interfaces and put it into the context of the Brazilian society, where one of the main challenges is the low literacy and numeracy skills of people even in the great metropolitan areas. We will discuss preliminary results of a research approach to the fourth SBC Challenge (Participatory and Universal Access of the Brazilian Citizen to Knowledge) in the perspective of the Human-Computer Interaction (HCI) discipline.

- by Heiko Hornung
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- Human Computer Interaction, Social Problems, Quality of life, Universal Access

This work introduces SUE -situated usability evaluation. We show that using SUE in medical systems evaluation provides better results than laboratory usability evaluations. Also, we discuss that SUE can help in compliance with Brazilian standards of usability, medical electrical equipment standards and concepts of ergonomic work analysis. Using SUE in medical equipment design can result in more adequate projects to the needs of health professionals, reducing human failures and errors, providing comfort to the workers and increasing the probabilities of success of patient treatment. Resumo. Este trabalho introduz a SUEavaliação situada de usabilidade. Mostra-se que o uso da SUE na avaliação de sistemas médicos produz resultados melhores do que as avaliações de usabilidade em laboratório. Também é discutido que a SUE proporciona meios de atender as normas brasileiras de usabilidade, as normas de equipamentos médicos e os conceitos de análise ergonômica do trabalho. Usar a SUE no projeto de equipamentos médicos pode resultar em equipamentos mais adequados às necessidades dos profissionais da saúde, reduzindo as falhas e erros humanos, proporcionando conforto aos trabalhadores e aumentando a probabilidade de sucesso do tratamento do paciente.

- by Lucia Vilela Leite Filgueiras
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- Usability Evaluation, Health Professionals, SBC, System Evaluation

This work exploits the possibilities offered by the recently developed multivariate method named Science-Based Calibration (SBC), for the extraction of 'analyte-specific' chromatograms in on-line gradient reversed phase LC-infrared spectrometry (IR) in the presence of a high spectral and chromatographic overlapping between the analyte of interest, coeluting sample matrix constituents and the mobile phase components. The SBC method uses an experimentally measured single response spectrum of the analyte of interest and representative noise to calculate an optimum regression vector (b opt ). Then, the b opt vector is used to predict the concentration of the analyte of interest in the spectra of the LC-IR sample chromatograms. To evaluate the advantages and pitfalls of the proposed approach, two different situations were analysed on real LC-IR data sets obtained from the injection of a series of standard solutions of four nitrophenols (p-nitrophenol, 3-methyl-4nitrophenol, 2,4-dinitrophenol and 4-nitrophenol) in a reversed phase system under gradient conditions. In the first situation, the extraction of the 'analyte-specific' chromatogram was carried out without previous knowledge of the spectral features of other interferents present in the sample matrix. In a second situation evaluated, data obtained from the LC injection of a sample blank is available. Results show the potential applicability of this technique in a variety of situations and evidenced that the proposed chemometric approach improves the selectivity and sensitivity of the LC-IR hyphenation.

- by Julia Kuligowski
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- Analytical Chemistry, Chemometrics, Separation, Multivariate Analysis

Despite the accomplishment of several researches in the area, algorithms and programming teaching still constitutes a challenge for the Computer Science. Starting from a previous analysis of problems detected in this process and possible contributions of cooperation and collaboration, important requirements to compose a more productive learning context were identified. In this sense, the paper objective is to define a proposal of a scenery for algorithms and programming learning, incorporating technologies that include cooperation, collaboration and coordination.

- by Adriana Vivacqua
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- SBC

- by Luciana Nedel and +2
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- Computational Mechanics, Statistical Analysis, Structure Analysis, Cognitive Ability

En este proyecto se muestran algunos componentes de interés
para el desarrollo de una metodología que permita la extracción del conocimiento en expertos humanos en un área específica, esto para el diseño e implementación de un sistema basado en conocimiento (SBC). Los componentes muestran integrar e integrar los procesos de la ingeniería del conocimiento (responsable de hacer el análisis y diseño de un SBC) aplicando razonamiento en casos (RC). En esta primera etapa del proyecto se comparten los resultados parciales de los elementos clasificados, además de algunas observaciones sobre los temas relacionados.

- by Jovani Alberto Jimenez Builes and +1
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- SBC
- by robert barchi
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- Chemical Engineering, Chemistry, Ion Channels, Biological Sciences

If you experience problems downloading a file, check if you have the proper application to view it first. In case of further problems read the IDEAS help page. Note that these files are not on the IDEAS site. Please be patient as the files may be large. ... Software component provided by Boston College Department of Economics in its series Statistical Software Components with number S4010201. ... This item is not listed on Wikipedia, on a reading list or among the top items on IDEAS. ... If you have authored this item and are not yet registered with RePEc, we ...

- by Stanislav Kolenikov
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- Model Selection, Goodness of Fit, SBC, AIC

Regency that make connection between 2 big cities, they are Jogja (Yogyakarta) and Solo (Surakarta). There are many traders and the numbers are getting higher these days at Jogja-Solo street. This research aim is to find the trading profile along Jogja-Solo road (1). The other aim was to find the factors that influence the income from this trading (2). The result (1) is: demografi, social, and economic profile pattern between 3 zones have some different. The different of profile pattern is in the age profile of seler, various product that sold, income, and the improve of trading. The result (2) is location, the amount of early capital and daily capital influence to income trading. The various product sold did not influence the income.

- by chal larson
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- SBC

Purpose: We determined the influence of age on response to intravesical immunotherapy in patients with superficial bladder cancer. Materials and Methods: Data from a national phase II multicenter trial for BCG plus IFN-␣ intravesical therapy for superficial bladder cancer were analyzed. Recurrence-free survival 2 years after the initiation of therapy was examined in patients by incremental age decade. BCG-N patients received 81 mg BCG and 50 MU IFN-␣, while patients who had previously been treated with BCG received a third of the BCG dose with 50 MU IFN-␣ and those who were BCG intolerant received a tenth of the BCG dose with 100 MU IFN-␣. Kaplan-Meier survival curves were obtained. Results: In all patients the largest difference in response was between the 289 who were 61 to 70 years old and the 123 who were older than 80 years with a 22% difference in cancer-free survival at a median followup of 24 months (61% vs 39%, p ϭ 0.0002). When we assessed BCG-N and BCG treated patients separately in the 2 age groups, patients older than 80 years had a persistently lower response rate than younger patients 61 to 70 years old. Of BCG-N patients those older than 80 and younger than 50 years had the lowest cancer-free survival at a median followup of 24 months (47% and 45%, respectively). On multivariate analysis age was an independent risk factor for response.

- by Badrinath Konety
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- Urology, Bladder Cancer, Immunotherapy, Clinical Sciences

Using the experimental structures of Aβ amyloid fibrils and all-atom molecular dynamics, we study the force-induced unbinding of Aβ peptides from the fibril. We show that the mechanical dissociation of Aβ peptides is highly anisotropic and proceeds via different pathways when force is applied in parallel or perpendicular direction with respect to the fibril axis. The threshold forces associated with lateral unbinding of Aβ peptides exceed those observed during the mechanical dissociation along the fibril axis. In addition, Aβ fibrils are found to be brittle in the lateral direction of unbinding and soft along the fibril axis. Lateral mechanical unbinding and the unbinding along the fibril axis load different types of fibril interactions. Lateral unbinding is primarily determined by the cooperative rupture of fibril backbone hydrogen bonds. The unbinding along the fibril axis largely depends on the interpeptide Lys-Asp electrostatic contacts and the hydrophobic interactions formed by the Aβ C terminal. Due to universality of the amyloid β structure, the anisotropic mechanical dissociation observed for Aβ fibrils is likely to be applicable to other amyloid assemblies. The estimates of equilibrium forces required to dissociate Aβ peptide from the amyloid fibril suggest that these supramolecular structures are mechanically stronger than most protein domains.

- by Valeri Barsegov
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- Molecular Biology, Kinetics, Amyloid, Computer Simulation

Resumo. Restauração de imagem é uma importante etapa de qualquer sistema de computação gráfica. Este trabalho tem como objetivo apresentar e avaliar o paralelismo de Denoiser, uma aplicação para detecção e eliminação de ruído em streaming de vídeo. Foram avaliados o speed-up e programabilidade das interfaces SPar, Thread Building Blocks e FastFlow. Os resultados mostram que a SPar obteve bons resultados de programabilidade e desempenho.

O objetivo deste artigo é relatar brevemente o histórico do Laboratório de Ambientes Virtuais Interativos (LAVI), sua criação, equipe, produções e interesses de pesquisa.

- by Eunice Nunes
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- Sociology, SBC
- by Andrew Laine
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- Materials Science, Medicine, Biological Sciences, Brain

- by Diana Adamatti
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- Decision Making, Social Inclusion, Role-playing Game Theory, Complex System

The phase of low-frequency sinusoids is encoded in phase-coupled discharges of spherical bushy cells (SBCs) of the anteroventral cochlear nucleus and transmitted to the medial superior olive, where binaural input-coincidence is used for processing of sound source localization. SBCs are innervated by auditory nerve fibers through large, excitatory synapses (endbulbs of Held) and by inhibitory inputs, which effectively reduce SBC discharge rates. Here we monitor presynaptic potentials of endbulb-terminals and postsynaptic spikes of SBCs in extracellular single unit recordings in vivo. We compare postsynaptic phase-coupling of SBCs and their presynaptic immediate auditory nerve input. In all but one SBC discharge rates at the characteristic frequency were reduced pre-to-postsynaptically and phase-coupling accuracy was increased in one-third of them. We investigated the contribution of systemic inhibition on spike timing in SBCs by iontophoretic application of glycine-and GABA-receptor antagonists (strychnine, bicuculline). Discharge rate increased in one-third of the units during antagonist application, which was accompanied by a deterioration of phase-coupling accuracy in half of those units. These results suggest that the phase-coupling accuracy is improved in a subpopulation of SBCs during transmission from the auditory nerve to the SBCs by reduction of spike rates.

- by Conny Kopp-Scheinpflug
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- Low Frequency, Hearing, Si, Medical Physiology
- by Aldo Geuna
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- Industrial Economics, Higher Education, Measuring, Spillover

This paper describes the preliminary results of a research in progress that presents a hybrid approach used as an alternative to model imprecise and aleatory uncertainties in urology medical area, from fuzzy and bayesian logic.

- by Cristian Cechinel
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- Hybrid Approach, SBC

This article shows preliminary results of a novel classification model for FAN Hep-2 exams. This work used wavelets transforms to extract features and Euclidian distance metrics to measure similarity between two images. The results obtained are promising. The work defines a standardized reading for FAN Hep2 Exams that can lead to a reduction of interpretation errors and can also be used to standardize FAN Hep-2 exam readings. Resumo. Este artigo mostra os resultados preliminares de um novo modelo de classificação de exames de FAN Hep-2. As técnicas utilizadas neste artigo foram transformadas wavelets para extração de características e a métrica Euclidiana para medir a similaridade entre as imagens. Os resultados se mostraram promissores. O trabalho define uma leitura padronizada dos padrões, que poderá levar à redução dos erros de interpretação e poderá também ser utilizada para uniformizar a leitura dos exames FAN Hep-2.

- by Eduardo Galdino
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- Wavelet Transform, Distance metric, SBC

This paper will analyze the influence of the scheduler algorithms in network throughput of a virtualized environment. For research tools, Xen will be used as Virtual Machine Monitor and the Credit Scheduler as scheduler algorithm. The experimental results show that under specific configurations changes in some scheduler's parameters can influence in high degree the observed network throughput. Resumo. Neste artigo, será analisada a influência dos algoritmos de escalonamento na vazão de rede em um ambiente virtualizado. Como ferramentas de estudo serão utilizadas o Xen como monitor de máquinas Virtuais e o algoritmo de escalonamento Credit Scheduler. Após a análise dos resultados experimentais, pode-se verificar que, em determinadas configurações, algumas alterações nos parâmetros do escalonador podem influenciar de forma bastante acentuada a taxa observada de vazão da rede.

- by Artur Baruchi
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- SBC

This paper describes how cognitive and computational concepts can be applied to build interface and learner models for long-term tutorial interactions in medical Radiology. Key human-to-human tutorial dialogue factors that typically occur in the different stages of skill acquisition are captured through an empirical study. The results of the study are detailed and linked to the design of RUI-2, an Authoring and Intelligent Tutoring System shell for multiple domains of radiological expertise. A brief discussion and future research directions offer a comparative view of the method and tools. Resumo. Este artigo descreve como princípios cognitivos e computacionais podem ser aplicados na criação de modelos de interface e de aprendizes para o treinamento de longo prazo em Radiologia médica. Um estudo empírico apresenta os conceitos chave que ocorrem em diálogos tutoriais apenas entre humanos nos diferentes estágios de aquisição da perícia. Os resultados desse estudo são detalhados e associados ao projeto do ambiente RUI-2, uma ferramenta de autoria e sua "shell" de Sistema Tutor Inteligente para múltiplos domínios de Radiologia médica. Uma breve discussão oferece uma visão crítica do método seguida de metas futuras de pesquisa.

- by Marcos Castilho
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- Skill Acquisition, Learner Model, Intelligent Tutoring System, Empirical Study

A maioria das soluções para IoT, com intuito de reduzir o consumo de energia, assume severas restriçõesá taxa de comunicação limitando-as para o uso de aplicações onde os sensores captam pequenas quantidades de dados. Por isso, estas soluções n ão s ão adequadas para o monitoramento de animais silvestres, que exige a transmiss ão de grandes quantidades de fotos capturadas por c âmeras trap instaladas no meio das florestas. Além disso o ambiente florestal também prejudica a capacidade de transmiss ão. Portanto, este trabalho prop õe a coleta de dados de dispositivos na floresta com o auxílio de drones. Assim, este artigo visa avaliar o desempenho de uma rede sem fio para a comunicação entre o drone e os dispositivos de captura de imagem. Para tal, s ão avaliadas as principais métricas de rede, tais como alcance máximo, taxa de transmiss ão e perda de pacotes. A título de comparação e para melhor caracterizar a transmiss ão na floresta, s ão realizados testes em outros cenários. O res...

- by Eduardo Alves
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- Engineering, Avaliação de Desempenho, Engenharia Elétrica, SBC

ABSTRACT A spectral beam combiner (SBC) based on multiplexed volume Bragg gratings ( VBGs) is demonstrated and presented. A new architecture for SBC with multiple VBGs recorded into a single piece of photo-thermo-refractive (PTR) glass is presented which significantly reduces the footprint of the spectral beam combiner. For this new architecture, multiple VBGs have been recorded into one PTR glass sample. For each VBG recorded into the glass, one laser beam can be diffracted from it allowing each beam combining element to diffract multiple beams into the common beam path. A spectral beam combiner based on multiplexed VBGs is demonstrated and presented.

- by Vadim Smirnov
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- Materials Science, Optics, Geometry, Surface Waves

Ataques DDoS são uma grande ameaça. Para mitigar seu impacto, sua detecção deve, preferencialmente, ocorrer na borda da rede, próximo à origem do ataque. Para tal, o uso de roteadores domésticos é uma opção. Entretanto, esses dispositivos são tipicamente limitados, tornando inadequadas as abordagens baseadas, por exemplo, em DPI. Propomos uma abordagem extremamente leve para detecção de DDoS usando roteadores domésticos que emprega exclusivamente contadores de bytes de interfaces de rede. Para detectar ataques com informações tão limitadas, usamos modelos de Machine Learning treinados com dados de centenas de usuários domésticos, obtidos através de parceria com um ISP, juntamente com ataques gerados em ambiente controlado usando as botnets Mirai e BASHLITE. Nossos classificadores são capazes de detectar diferentes vetores de ataque com F1 scores tipicamente superiores a 0,99.

- by Daniel Sadoc Menasche
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- SBC

- by José eurico V Filho
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- Decision Making, Social Inclusion, Role-playing Game Theory, Complex System

This paper presents results from employing an econometric approach to examine the determinants of scientific production at cross-country level. The aim of this paper is not to provide accurate and robust estimates of investment elasticities (a doubtful task given the poor quality of the data sources and the modelling problems), but to develop and critically assess the validity of an empirical approach for characterising the production of science and its impact from a comparative perspective. We employ and discuss the limitations of a production function approach to relate investment inputs to scientific outputs using a sample of 14 countries for which we have information about Higher Education Research and Development (HERD). The outputs are taken from the Thomson ISI® National Science Indicators (2002) database on published papers and citations. The inputs and outputs for this sample of countries have been recorded for a period of 21 years (1981-2002). A thorough discussion of data...

- by Aldo Geuna
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- Economics, Industrial Economics, Higher Education, Measuring

Currently, to facilitate the storage and search of patients information medical institutions make use of Electronic Patient Record (EPR). The first version of HUSM Cardiac Unit EPR wasn't planned with techniques of Usability Engineering, generating mistakes on data transcription. To minimize its mistakes and improve the productivity of EPR use, this work apply the principles of the Usability Engineering on redesigning the interfaces of the HUSM Cardiac Unit EPR. From usability tests over the two versions of the system it is showed a reduction in the mistakes average (37.5%) and in the time required to filling the EPR (33%). Resumo. Atualmente, instituições médicas utilizam intensivamente sistemas computadorizados, facilitando o registro e armazenamento das informações dos pacientes. O Prontuário Eletrônico de Pacientes (PEP) da Unidade de Alta Complexidade em Cardiologia do HUSM não foi planejado com técnicas de Engenharia de Usabilidade, o que contribuiu para a ocorrência de erros na transcrição de dados. Este trabalho trata da reengenharia das interfaces do PEP, aplicando-se os princípios da Engenharia da Usabilidade, visando obter uma melhora na produtividade de seus usuários. Testes de usabilidade frente às duas versões do sistema mostraram uma redução na média nos erros cometidos (37,5%) e no tempo necessário para preencher o PEP (33%).

- by Eliana Zen
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- Usability Testing, Usability Engineering, SBC
- by Michael A O'Donnell
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- Urology, Bladder Cancer, Immunotherapy, Clinical Sciences

The present study aimed to investigate the effectiveness of platelet-rich fibrin (PRF) on bone regeneration when used alone or in combination with hydroxyapatite (HA)/beta-tricalcium phosphate (βTCP). In this study, 20 New Zealand white rabbits were used and four calvarial defects were prepared in each animal. PRF, Straumann(®) Bone Ceramic (SBC), or PRF+SBC was applied to the defects; one defect was left untreated as a control. Ten rabbits were sacrificed at week 4 (T1) and 10 at week 8 (T2). After micro-computed tomography (micro-CT) scanning, the samples were sent for histological and histomorphometric analysis to evaluate and compare the volume and area of regenerated bone. Histomorphometric and micro-CT analysis showed that both PRF and SBC significantly increased bone regeneration at T1 and T2 (P&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;0.01). When PRF was used in combination with HA/βTCP, a further significant increase in new bone formation was observed at T1 and T2 compared with that when PRF or SBC was used alone (P&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;0.01). PRF has a positive effect on bone formation when used alone and in combination with HA/βTCP.

- by Ahmet Acar
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- Zoology, Dentistry, Biomedical Engineering, Bone Regeneration
- by Andre Costa Drummond
- •
- SBC

The concentration of ethylene in samples of heterophasic copolymers was monitored for 3 months by NIR spectroscopy and partial least-squares (PLS) multivariate calibration in an attempt to assess the validity over time of the calibration model. Assuming that the model would cease to be valid, we selected and monitored sufficient samples so as to initiate a process of standardisation. The samples were selected with the Kennard-Stone algorithm and according to the representivity of their ethylene content. The monitoring techniques were univariate (Shewhart) and multivariate (T 2 and Q) control plots. The results show that the system was stable, until the point at which there was a cause in variation which gave rise to an erroneous prediction of the ethylene content. This change did not vary over time. We used two techniques to standardise the calibration model: slope bias correction (SBC) and piecewise direct standardisation (PDS). They both corrected the error detected.

- by M. Larrechi
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- Analytical Chemistry, Data Analysis, Chemometrics, Principal Component Analysis

Resumo. Uma das tarefas de um sistema operacional é o tratamento de eventos de tempo. Tradicionalmente a gerência de tempo é baseada em interrupções periódicas de um dos relógios de hardware do sistema (ticks). Porém, esta abordagem apresenta limitações, como falta de precisão, maior custo computacional e maior consumo de energia. Isso motivou a procura por novas soluções, e o emprego de técnicas de temporizadores não periódicos (ex.: one-shot timers) tornou-se freqüente, principalmente em sistemas operacionais de propósito específico, que possuem algum tipo de restrição de tempo, energia ou processamento (ex.: sistemas embarcados, de tempo real e multimídia). Este trabalho faz uma comparação entre as implementações de temporizadores de disparo único e temporizadores periódicos na gerência de tempo do sistema operacional EPOS. São apresentados os impactos no tamanho de código do sistema (Footprint), número de trocas de contextos, número de execuções do tratador de interrupção e tempo de computação em diferentes cenários de execução.

- by Roberto Matos
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- OPERATING SYSTEM, Multimedia Systems, Time Management, Power Consumption

- by Roberto Matos
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- OPERATING SYSTEM, Multimedia Systems, Time Management, Power Consumption

- by Raul Ceretta Nunes
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- SBC

The amount of information generated by research in biological sciences has lead to an intensive use of models. Mathematical and computational modeling need accurate description to share and simulate models as formulated by original authors. CellML is a markup language that uses XML to describe such models in the context of biological process. It allows a raw description of variables, equations and components, but it is insufficient to express semantically the model. Our research focus on the use of ontologies to enrich the construction of new cell models. In this paper we introduce the Cell Component Ontology -CelO, an ontology expressed in OWL-DL. This ontology captures both the structure of a cell model and the properties of functional components. We are using this ontology in a Web project where the use of CelO allows describing, reasoning, querying and composing CellML models. It aims to improve reuse and composition of existent components and allow semantic validation of new models.

- by Ely Matos and +1
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- Computer Model, Biological Process, SBC, Simulation Model

This paper presents results from employing an econometric approach to examine the determinants of scientific production at cross-country level. The aim of this paper is not to provide accurate and robust estimates of investment elasticities (a doubtful task given the poor quality of the data sources and the modelling problems), but to develop and critically assess the validity of an empirical approach for characterising the production of science and its impact from a comparative perspective. We employ and discuss the limitations of a production function approach to relate investment inputs to scientific outputs using a sample of 14 countries for which we have information about Higher Education Research and Development (HERD). The outputs are taken from the Thomson ISI ® National Science Indicators (2002) database on published papers and citations. The inputs and outputs for this sample of countries have been recorded for a period of 21 years . A thorough discussion of data shortcomings is presented in this paper. On the basis of this panel dataset we investigate the profile of the time lag between the investment in HERD and the research output and the returns to national investment in science. We devote particular attention to analysis of the presence of cross-country spillovers. We show their relevance and underline the international effect of the US system

- by Aldo Geuna
- •
- Industrial Economics, Measuring, Spillover, HERD