Design of CAN-based distributed control systems with optimized configuration

A current trend in distributed control systems is the application of communication networktechnologies such as CAN - Controller Area Network. A recent utilization approach ofthese technologies is the networked control systems (NCS). The fundamental challenges inthe development of NCS are the analysis of the network delay effects and the prediction of the timing behavior of the distributed control system. The common parameters that impact the performance of NCS include response time, network utilization and network delays induced by the communication of messages between the devices. In addition, the performance of a NCS is highly dependent on these messages sampling times. A significant emphasis has been put on development and application of methodologies to handle the network delay effect in these systems and improve their performances. This paper presents a detailed timing analysis and a mathematical model to calculate these network delays in CAN-based networks. With the results of this model, the application of a methodology is proposed to minimize the effects of these delays and to achieve the optimization (networkoperation and utilization) of a CAN-based network. A case study of a CAN-based distributed control system in a mobile robot is described to demonstrate the application of the optimization methodology and the utilization of the CAN mathematical model systemized

Redes inalámbricas de sensores: una experiencia en la industria del té

En el proceso productivo del té existen parámetros que deben ser mantenidos bajo estricto control para así asegurar una calidad del producto acorde a la demanda internacional. Una de las principales industrias de té de la Provincia de Misiones ha propiciado la mejora de las condiciones y de la tecnología utilizada en la etapa del proceso productivo donde se lleva a cabo la fermentación del té a una temperatura entre 20ºC y 30 °C por un tiempo determinado. Fuera de este rango de temperaturas el té no alcanza a presentar su aroma y color característico. En el presente trabajo se presenta una experiencia realizada en una empresa productora de Té negro de la provincia de Misiones interesada en utilizar las ventajas de contralor de las variables del proceso productivo utilizando una tecnología que es clave en Internet del Futuro; una red inalámbrica de sensores (WSN).Sociedad Argentina de Informática e Investigación Operativ

Redes inalámbricas de sensores: una experiencia en la industria del té

En el proceso productivo del té existen parámetros que deben ser mantenidos bajo estricto control para así asegurar una calidad del producto acorde a la demanda internacional. Una de las principales industrias de té de la Provincia de Misiones ha propiciado la mejora de las condiciones y de la tecnología utilizada en la etapa del proceso productivo donde se lleva a cabo la fermentación del té a una temperatura entre 20ºC y 30 °C por un tiempo determinado. Fuera de este rango de temperaturas el té no alcanza a presentar su aroma y color característico. En el presente trabajo se presenta una experiencia realizada en una empresa productora de Té negro de la provincia de Misiones interesada en utilizar las ventajas de contralor de las variables del proceso productivo utilizando una tecnología que es clave en Internet del Futuro; una red inalámbrica de sensores (WSN).Sociedad Argentina de Informática e Investigación Operativ

Peixes de Costão Rochoso de Santa Catarina. I. Arvoredo

Este livro representa um passo importante no sentido de ampliar o conhecimento acerca da ictiofauna marinha do sul do Brasil e de sensibilizar pesquisadores, tomadores de decisão e o público em geral com relação à importância da conservação da Reserva Biológica Marinha do Arvoredo.ABSTRACT: The book is timely, as it provides meaningful support to regional management strategies, where the costal zone is in demonstrable irregular overgrowth. Although not specifically meant for management applications, the check list presented, as well as the photo-drawing guide is of great utility for many ecology/community studies. The book synthesizes a 10-year research effort, and is organized in several topics, which includes an introduction about the ABMR, a synopses on reef fish ecology biological adaptations of reef fish, systematic and rocky-shore habitat occupation. A check list and menaced species are also pointed out, as well as an explanation of how-to-use the guide, glossary and index. A total of 84 species are presented in colour underwater photos, common names are given in Portuguese, Spanish and English, with a detailed description of the most important distinctive features, pointed in schematic drawings of each species; behavior, feeding habits, reaction to divers and distribution are also reported. The book is a strong tool to accurately identifying the most common observed fish species when diving along South Brazil. This guide-book can surely be widely used in Brazil, especially to introduce young scientists and the general public in the rocky-shore fish ecology. Scuba divers will also benefit from this tool, which provides a practical way for further studying and identifying fishes

Projeto e desenvolvimento da arquitetura de um robô agrícola móvel

Parameters such as tolerance, scale and agility utilized in data sampling for using in Precision Agriculture required an expressive number of researches and development of techniques and instruments for automation. It is highlighted the employment of methodologies in remote sensing used in coupled to a Geographic Information System (GIS), adapted or developed for agricultural use. Aiming this, the application of Agricultural Mobile Robots is a strong tendency, mainly in the European Union, the USA and Japan. In Brazil, researches are necessary for the development of robotics platforms, serving as a basis for semi-autonomous and autonomous navigation systems. The aim of this work is to describe the project of an experimental platform for data acquisition in field for the study of the spatial variability and development of agricultural robotics technologies to operate in agricultural environments. The proposal is based on a systematization of scientific work to choose the design parameters utilized for the construction of the model. The kinematic study of the mechanical structure was made by the virtual prototyping process, based on modeling and simulating of the tension applied in frame, using the.Parâmetros, como tolerância, escala e agilidade empregados na amostragem de dados para uso em Agricultura de Precisão, exigem um expressivo número de pesquisas no desenvolvimento de instrumentos e técnicas para automação. Destacam-se a utilização de metodologias em sensoriamento remoto utilizadas em conjunto com o Sistema de Informação Geográfica (SIG), adaptados ou desenvolvidos para o uso agrícola. Visando a isso, a aplicação de Robôs Agrícolas Móveis é uma forte tendência, principalmente na União Europeia, EUA e Japão. No Brasil, pesquisas são necessárias para o desenvolvimento de plataformas robóticas, que sirvam de base para sistemas de navegação autônomos ou semiautônomos. O objetivo deste trabalho é descrever o projeto de uma plataforma experimental para a aquisição de dados em campo para o estudo da variabilidade espacial e desenvolvimento de tecnologias para operação de robôs em ambiente agrícola. A proposta baseia-se em uma sistematização de trabalhos científicos que norteiam a escolha dos parâmetros de projeto utilizados para a construção do modelo. O estudo cinemático da estrutura mecânica foi feito pelo processo de prototipagem virtual, baseado na modelagem e simulação das tensões aplicadas no chassi, utilizando o método dos elementos finitos, em função dos conceitos básicos de cinemática de robôs móveis e experiências em trabalhos anteriores.(FAPESP) São Paulo Research Foundation(CNPq) National Council of Scientific and Technological Developmen

Assessment of ultrasound and Doppler parameters in the third trimester of pregnancy as predictors of adverse perinatal outcome in unselected pregnancies

Objectives: The aim of the study was to investigate ultrasound and Doppler parameters in the third trimester of pregnancy as possible predictors of adverse perinatal outcome in unselected pregnancies. Material and methods: We performed a retrospective cross-sectional study including unselected pregnant women be­tween 27 and 36 + 6 weeks of gestation. The following ultrasound and Doppler parameters were assessed: estimated fetal weight (EFW) [g], EFW percentile, placental maturity grade (Grannum classification), single vertical deepest pocket (SVDP) of amniotic fluid [cm], amniotic fluid index (AFI) [cm], mean uterine artery (UtA) pulsatility index (PI), umbilical artery (UA) PI, middle cerebral artery (MCA) PI, MCA peak systolic velocity (PSV) [cm/s], and cerebroplacental ratio (CPR). Adverse perinatal outcome was defined as Apgar score of < 7 at 1 min, birth weight of < 2500 g at delivery, and gestational age of < 37 weeks at delivery. The unpaired t test was used to compare the groups. Results: AFI (p = 0.01), mean UtA PI (p = 0.04) and mean UA PI (p = 0.03) were significantly different with regard to the Apgar score at 1 min. EFW, EFW percentile, SVDP of amniotic fluid, AFI, mean UtA PI, UA PI, and MCA PI were significantly different (p < 0.001) in terms of birth weight. Placental maturity grade (p = 0.02), SVDP of the amniotic fluid (p < 0.001), AFI (p < 0.001), mean UtA PI (p < 0.001), UA PI (p = 0.001), and MCA PI (p < 0.001) were significantly different as far as gestational age at delivery is concerned. Conclusion: Ultrasound and Doppler parameters may predict adverse perinatal outcomes in unselected pregnancies in the third trimester of pregnancy