Session PT4A CONTROLE DISTRIBUÍDO COM TRANSDUTORES ORIENTADOS A SERVIÇOS Alexandre Alves de Lima Ribeiro, Alexandre César Rodrigues da Silva This paper presents an architecture that allows the interconnection of smart transducers as standard services. For this purpose are investigated patterns of smart transducers networking, embedded platforms and service oriented architectures. Some results of implementations and mappings transducers RESTful services in XML and JSON are presented. As example is presented a distributed control application where the elements of a closed-loop plant are services on a transducer networking.
DESENVOLVIMENTO DE UM INCLINÔMETRO DIGITAL INTERATIVO PARA A VISUALIZAÇÃO DE ÂNGULOS TRIGONOMÉTRICOS Alex Pereira Mattos, Alexandre César Rodrigues da Silva This paper presents the development of a digital inclinometer based on inertial sensor, accelerometer type. In the development of digital inclinometer, it was used a microcontroller, an accelerometer and a computer. The system was implemented to allow a friendly interaction with the user, so that knowledge of trigonometry can be absorbed in a playful and uncomplicated. The system also has difficulty levels allowing the user to improve their performance.
APROXIMAÇÃO DA FUNÇÃO TANGENTE HIPERBÓLICA EM HARDWARE Maicon A. Sartin, Alexandre César Rodrigues da Silva The ANN (artificial neural networks) are widely used in various applications in engineering, especially for troubleshooting nonlinear nature, classification and clustering, in pattern recognition, function approximation, among others. The implementation of RNA in reconfigurable devices is a major challenge, since many factors such as floating point precision, the tangent hiperbolic activation function and the area used in the FPGA are involved. This paper presents the implementation of various types of tangent hiperbolic activation function based LUT (Look-Up Tables) in order to assist in choosing the best approximation of nonlinear functions in hardware. It presents also a comparison of the results obtained with the literature currently available, and various implementation characteristics were analyzed as the area used in FPGA, and the error rate in memory access time by statistical tools CAD.
MEDIÇÃO DE TEMPERATURA E NÍVEL DO LENÇOL FREÁTICO UTILIZANDO REDE DE SENSORES SEM FIO Tércio Alberto dos Santos Filho, Alexandre César Rodrigues da Silva This paper presents the development of a client node in wireless sensor network that performs the acquisition of temperature and level of groundwater. The network node was developed employing a routable XBee-Pro module, a temperature sensor LM35, a pressure sensor MPX5700DP and a microcontroller ATmega8. The system is able to monitor changes in the level of groundwater can be adapted for use in rivers and lakes for the issuance of alert for possible flooding. The network node operates autonomously and can be installed in locations with difficult access; it has autonomy to operate for long periods of time. The information obtained by the sensor node is sent to software installed on a portable microcomputer. This remote monitoring system will allow researchers to examine climate change in regions difficult to access through an online system.
METODOLOGIA PARA SÍNTESE AUTOMÁTICA DE MÁQUINAS DE ESTADOS FINITOS BASEADA EM DESCRIÇÃO EM ALTO NÍVEL DE ABSTRAÇÃO Eduardo Lopes da Cruz, Tiago da Silva Almeida, Alexandre César Rodrigues da Silva This paper present a methodology of synthesis of descriptions in high-level of abstraction for finite state machines. The synthesis process has a tools collection to perform the simulation, the reading the relevant instructions, the conversion of this instructions, the minimization and the generation of code and hardware implementation. To evaluate the methodology was used the line code HDB1 as case study. The results were obtained a minimum circuit of low cost.
© 2013 ICECE
March 03 - 06, 2013, Luanda, ANGOLA VIII International Conference on Engineering and Computer Education
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