Todo el mundo hará caso : bases teóricas y propuestas de diseño de un sistema multimedia para construir la herramienta didáctica del estudio del caso en un programa de enseñanza no presencial.

La institución sobre gestión realizó una investigación sobre público objetivo y demuestra que un 85 por ciento de los estudiantes potenciales conecta con un ordenador MMX en casa o en la productora. Se encuentran muy dispersos, pero de forma homogénea en tres núcleos urbanos que distan más de quince kilómetros; la empresa concede un tiempo para la formación pero, a la vez, los necesita siempre y cerca.

Study of the audio coding algorithm of the MPEG-4 AAC standard and comparison among implementations of modules of the algorithm

Audio coding is used to compress digital audio signals, thereby reducing the amount of bits needed to transmit or to store an audio signal. This is useful when network bandwidth or storage capacity is very limited. Audio compression algorithms are based on an encoding and decoding process. In the encoding step, the uncompressed audio signal is transformed into a coded representation, thereby compressing the audio signal. Thereafter, the coded audio signal eventually needs to be restored (e.g. for playing back) through decoding of the coded audio signal. The decoder receives the bitstream and reconverts it into an uncompressed signal. ISO-MPEG is a standard for high-quality, low bit-rate video and audio coding. The audio part of the standard is composed by algorithms for high-quality low-bit-rate audio coding, i.e. algorithms that reduce the original bit-rate, while guaranteeing high quality of the audio signal. The audio coding algorithms consists of MPEG-1 (with three different layers), MPEG-2, MPEG-2 AAC, and MPEG-4. This work presents a study of the MPEG-4 AAC audio coding algorithm. Besides, it presents the implementation of the AAC algorithm on different platforms, and comparisons among implementations. The implementations are in C language, in Assembly of Intel Pentium, in C-language using DSP processor, and in HDL. Since each implementation has its own application niche, each one is valid as a final solution. Moreover, another purpose of this work is the comparison among these implementations, considering estimated costs, execution time, and advantages and disadvantages of each one.

Efeitos imediatos da eletroestimulação nervosa transcutânea e crioterapia na espasticidade e na atividade eletromiográfica de sujeitos hemiparéticos

Cerebrovascular accident (CVA) is a term used to characterize an ischemic or hemorrhagic vascular injury, which has got as main clinic manifestations, the motor and reflex function disturbance. In the first stage there is flaccidity and loss of voluntary movements that afterwards is substituted by mass patterns and spasticity. The spasticity brings with itself functional deficits and can generate negative impacts in various motor patterns. The aim of this research was to investigate the hyperreflexia and identify the immediate effects of transcutaneous nervous stimulation (TENS) and cryotherapy in the spasticity and electromyographic activity of hemiparetic subjects. The study is characterized as an almost experimental type, in which were selected, to compose the sample, 16 patients of both sex with CVA sequel. These individuals were evaluated by collecting the amplitude peak to peak and H reflex latency, Motor response (M response) in solear muscle and the electromyography (EMG) of the injured and healthy legs anterior tibial muscles. In the injured limb the evaluations occurred in different days for cryotherapy, TENS and control, in two moments, before and after the interventions. The healthy limb was evaluated one single time to serve as baseline, for comparison with the injured limb. It was used an statistic analysis, the t paired student test to identify the H reflex differences, latency and EMG of the injured and healthy limbs and to compare the results before and after the recourses application. The ANOVA for related samples was used to identify the differences among the recourses used. It was attributed for the statistic tests a significance level of 5%. The amplitude peak to peak of normalized maximum H reflex through the maximum motor response (Hmax/Mmax), showed itself significantly increased in the injured limb (p=0.0245). The H reflex latency was presented reduced in the injured limb (p=0, 0375). The electromyographic activity was showed decreased in the injured limb (p< 0.0001). After the TENS there was a Hmáx/Mmáx ratio decrease (0.60±0.16 versus 0.49.±0.18; P = 0.0006). Nonetheless, Just after the cryotherapy application there was an increase of Hmáx/Mmáx ratio (0.58 ± 0,15 to 0.77 ± 0.13, P=0,0007) and increase of signal latency (30.41 ± 1.87 versus 33.24 ± 2.19; P=0.0001). The electromyographic activity wasn t altered significantly by any resource. It was met statistic significant differences when the Hmáx/Mmáx P<0.0001) ratio and H reflex latency (P<0.0001) were compared between the post TENS, cryotherapy and control. One can conclude that the TENS can be used to spasticity immediate reduction, and that the cryotherapy can increase the hyperreflexia state in spastic patients. Nonetheless, the spasticity decrease or increase didn t provoke lectromyographic activity change in the muscle that is opponent to the spastic one

Avaliação econômica de Eucalipto irrigado em diferentes cenários

Pós-graduação em Agronomia (Irrigação e Drenagem) - FCA

Análise da modulação do reflexo H do vasto medial em mulheres com síndrome da dor femoropatelar

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Procesamiento de imágenes y control de un hexacóptero

En este proyecto se pretende diseñar un sistema embebido capaz de realizar procesamiento de imágenes y guiado de un hexacóptero. El hexacóptero dispondrá a bordo de una cámara así como las baterías y todo el hardware necesario para realizar el procesamiento de la información visual obtenida e implementar el controlador necesario para permitir su guiado. OpenCV es una biblioteca de primitivas de procesado de imagen que permite crear algoritmos de Visión por Computador de última generación. OpenCV fue desarrollado originalmente por Intel en 1999 para mostrar la capacidad de procesamiento de los micros de Intel, por lo que la mayoría de la biblioteca está optimizada para correr en estos micros, incluyendo las extensiones MMX y SSE. http://en.wikipedia.org/wiki/OpenCV Actualmente es ampliamente utilizada tanto por la comunidad científica como por la industria, para desarrollar nuevos algoritmos para equipos de sobremesa y sobre todo para sistemas empotrados (robots móviles, cámaras inteligentes, sistemas de inspección, sistemas de vigilancia, etc..). Debido a su gran popularidad se han realizado compilaciones de la biblioteca para distintos sistemas operativos tradicionales (Windows, Linux, Mac), para dispositivos móviles (Android, iOS) y para sistemas embebidos basados en distintos tipos de procesadores (ARM principalmente). - iPhone port: http://www.eosgarden.com/en/opensource/opencv-ios/overview/ - Android port: http://opencv.willowgarage.com/wiki/AndroidExperimental Un ejemplo de plataforma embebida es la tarjeta Zedboard (http://www.zedboard.org/), que representa el estado del arte en dispositivos embebidos basados en la arquitectura Cortex de ARM. La tarjeta incluye un procesador Cortex-A9 dual core junto con una gran cantidad de periféricos y posibilidades de conexión a tarjetas de expansión de terceras partes, lo que permite desarrollar aplicaciones en muy distintos campos de la Visión por Computador.

Low-cost real-time gesture recognition

A major impediment to developing real-time computer vision systems has been the computational power and level of skill required to process video streams in real-time. This has meant that many researchers have either analysed video streams off-line or used expensive dedicated hardware acceleration techniques. Recent software and hardware developments have greatly eased the development burden of realtime image analysis leading to the development of portable systems using cheap PC hardware and software exploiting the Multimedia Extension (MMX) instruction set of the Intel Pentium chip. This paper describes the implementation of a computationally efficient computer vision system for recognizing hand gestures using efficient coding and MMX-acceleration to achieve real-time performance on low cost hardware.