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- SourceAvailable from: Laisa Antonela dos Santos[Show abstract] [Hide abstract]
ABSTRACT: To investigate the influence of intraoperative and preoperative positive pressure in the time of extubation in patients undergoing bariatric surgery. Randomized clinical trial, in which 40 individuals with a body mass index between 40 and 55kg/m(2), age between 25 and 55 years, nonsmokers, underwent bariatric surgery type Roux-en-Y gastric bypass by laparotomy and with normal preoperative pulmonary function were randomized into the following groups: G-pre (n=10): individuals who received treatment with noninvasive positive pressure before surgery for 1h; G-intra (n=10): individuals who received positive end-expiratory pressure of 10cm H2O throughout the surgical procedure; and G-control (n=20): not received any preoperative or intraoperative intervention. Following were recorded: time between induction of anesthesia and extubation, between the end of anesthesia and extubation, duration of mechanical ventilation, and time between extubation and discharge from the post-anesthetic recovery. There was no statistical difference between groups. However, when applied to the Cohen coefficient, the use of positive end-expiratory pressure of 10cm H2O during surgery showed a large effect on the time between the end of anesthesia and extubation. About this same time, the treatment performed preoperatively showed moderate effect. The use of positive end-expiratory pressure of 10cm H2O in the intraoperative and positive pressure preoperatively, influenced the time of extubation of patients undergoing bariatric surgery. Copyright © 2014 Sociedade Brasileira de Anestesiologia. Published by Elsevier Editora Ltda. All rights reserved.
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ABSTRACT: The projects with embedded systems are used for many different purposes, being a major challenge for the community of developers of such systems. As we benefit from technological advances the complexity of designing an embedded system increases significantly. This paper presents GERSE, a guideline to requirements elicitation of embedded systems. Despite of advances in the area of embedded systems, there is a shortage of requirements elicitation techniques that meet the particularities of this area. The contribution of GERSE is to improve the capture process and organization of the requirements of embedded systems projects. Resumo. Os projetos de sistemas embarcados são desenvolvidos para as mais diversas finalidades, apresentando-se como um grande desafio para a comunidade de desenvolvedores de software. Na medida em que nos beneficiamos dos avanços tecnológicos, a complexidade dos sistemas embarcados tem aumentado de forma significativa. Neste artigo apresentamos o GERSE, um guia para elicitação de requisitos de sistemas embarcados. Apesar dos avanços na área de sistemas embarcados, nota-se uma escassez de técnicas de elicitação de requisitos que atendam às particularidades desta área. A contribuição do GERSE vem no sentido de melhorar o processo de captura e organização dos requisitos em projetos de sistemas embarcados.
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ABSTRACT: The production sector of molds and dies is under a continuous pressure for process optimization due the high lead time required for the production of complex tools. In recent years, to improve this sector, numerous studies have been aimed at optimization of the CAD/CAM/CNC chain. However, despite recent technological innovations such as development of cutting tools, machine tools, and process simulation systems, the machining step still represents a major bottleneck in this process. The current generation of Numerical Control (NC) programs that represents the tool path do not consider the dynamic characteristics of the machine tool in the decision-making process to choose the most appropriate cutting strategies, resulting in NC programs that do not reach levels of excellence. The main objective of this paper is to present the development of a reference index based on the dynamic characteristics of the Machine Tool to support the NC programming with a commercial CAM system. This index considers the Machine Response Time (MRT) of NC controller, the acceleration and deceleration on the axes of the machine tool and the tool path segment (size and inclination). The index makes possible an experimental evaluation of relationships between the programmed feed rate for the tool path and dynamic performance due to movements of the machine axes, thus becoming an important decision-making factor in choosing the best machining strategy and consequently a better plan of the production process in die and mold industries.
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