Piloto automático: Sistema de navegação autónoma

Desde o início do crescente interesse na área de robótica que a navegação autónoma se apresenta como um problema de complexa resolução que, por isso, desperta vasto interesse no meio científico. Além disso, as capacidades da navegação autónoma aliadas à robótica permitem o desenvolvimento de variadas aplicações. O objectivo da navegação autónoma é conferir, a um dispositivo motor, capacidade de decisão relativa à locomoção. Para o efeito, utilizam-se sensores, como os sensores IMU, o receptor GPS e os encoders, para fornecer os dados essenciais à navegação. A dificuldade encontra-se no correcto processamento destes sinais uma vez que são susceptíveis a fontes de ruído. Este trabalho apresenta um sistema de navegação autónomo aplicado ao controlo de um robot. Para tal, desenvolveu-se uma aplicação que alberga todo o sistema de localização, navegação e controlo, acrescido de uma interface gráfica, que permite a visualização em mapa da movimentação autónoma do robot. Recorre-se ao Filtro de Kalman como método probabilístico de estimação de posição, em que os sinais dos vários sensores são conjugados e filtrados. Foram realizados vários testes de modo a avaliar a capacidade do robot atingir os pontos traçados e a sua autonomia no seguimento da trajectória pretendida.

Ablation of ischemic ventricular tachycardia: evidence, techniques, results, and future directions

PURPOSE OF REVIEW This article summarizes current understanding of the arrhythmia substrate and effect of catheter ablation for infarct-related ventricular tachycardia, focusing on recent findings. RECENT FINDINGS Clinical studies support the use of catheter ablation earlier in the course of ischemic disease with moderate success in reducing arrhythmia recurrence and shocks from implantable defibrillators, although mortality remains unchanged. Ablation can be lifesaving for patients presenting with electrical storm. Advanced mapping systems with image integration facilitate identification of potential substrate, and several different approaches to manage hemodynamically unstable ventricular tachycardia have emerged. Novel ablation techniques that allow deeper lesion formation are in development. SUMMARY Catheter ablation is an important therapeutic option for preventing or reducing episodes of ventricular tachycardia in patients with ischemic cardiomyopathy. Present technologies allow successful ablation in the majority of patients, even when the arrhythmia is hemodynamically unstable. Failure of the procedure is often because of anatomic challenges that will hopefully be addressed with technological progress.

Truck noise IV-G. Field test results on a heavy duty, diesel truck having reduced noise emissions. Seventh report.

Transportation Department, Office of Noise Abatement, Washington, D.C.

Citizen's band radio safety evaluation project. Volume I - technical summary. Final report.

National Highway Traffic Safety Administration, Office of Driver and Pedestrian Programs, Washington, D.C.

Development of recommendations to improve controls operability. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

Preliminary human factors guidelines for automated highway system designers. Volume I: guidelines for AHS designers.

Federal Highway Administration, Washington, D.C.

Provision of an airborne early warning system for Pakistan [microform] : hearings before the Subcommittee on Asian and Pacific Affairs of the Committee on Foreign Affairs, House of Representatives, One Hundredth Congress, first session, May 21 and June 11, 1987.

CIS Microfiche Accession Numbers: CIS 89 H381-7

Test and evaluation of the AMF, Inc. and Fairchild Industries experimental safety vehicles. Volume III. ESV program summary. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

A motorist radio service. Final report.

Federal Highway Administration, Washington, D.C.

Human factors criteria for vehicle controls and displays. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

Human factors criteria for vehicle controls and displays. Appendix B. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

Human factors criteria for vehicle controls and displays. Appendix C. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

Human factors criteria for vehicle controls and displays. Appendix D. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

Alternate engines - state of the art study. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

Statistical analysis of 102-inch wide intercity bus accident data. Final report.

National Highway Traffic Safety Administration, Washington, D.C.