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Nomenclatura Unesco > (33) Ciencias Tecnológicas

Mostrando recursos 61 - 80 de 2,144

61. Educação, ciência e tecnologia: história da difusão tecnológica no noroeste do Rio Grande do Sul. - Neumann, Rosane M.

62. A new lightweight masonry block: Thermal and mechanical performance - Luísa Costa Sousa; Hipólito Sousa; Catarina Castro; Carlos António; Rui Sousa
The concerns with masonry building envelope performance, particularly thermal efficiency, are causing major changes in masonry solutions, mainly in south European countries, where traditionally the mild winter climate justified the use of high thermal masonry wall performance. The new European Directives regulations require different solutions. This paper describes the development a new masonry system, based on lightweight concrete units, intended for construction of large single leaf external walls without thermal insulation materials. A detailed analysis and optimization has been performed by FEM, under thermal point of view. This work was followed by a set of experimental tests in order to...

63. Segmentation Algorithms for Ear Image Data towards Biomechanical Studies - Ana Ferreira; Fernanda Gentil; João Manuel R. S. Tavares
In recent years, the segmentation, i.e. the identification, of ear structures in video-otoscopy, computerised tomography (CT) and magnetic resonance (MR) image data, has gained significant importance in the medical imaging area, particularly those in CT and MR imaging. Segmentation is the fundamental step of any automated technique for supporting the medical diagnosis and, in particular, in biomechanics studies, for building realistic geometric models of ear structures. In this paper, a review of the algorithms used in ear segmentation is presented. The review includes an introduction to the usually biomechanical modelling approaches and also to the common imaging modalities. Afterwards, several...

64. Diseño y creación de una interfaz para el desarrollo de aplicaciones que utilicen servicios de comunicaciones por radio - Olivares Guedes, Víctor

[ES] La implantación en Canarias de la tecnología de radio TETRA trae como consecuencia la necesidad de una plataforma de alto nivel para operar con la red y los terminales asociados. Debido a esta necesidad se plantea el desarrollo y la implementación de una capa de acceso al hardware y la red que sea lo suficientemente escalable para así desarrollar sobre ésta un repertorio de utilidades que haga más eficiente la gestión de toda esta nueva infraestructura de comunicación. Este proyecto final de carrera se encarga de fijar las bases de esa comunicación con la red TETRA a través de...

65. Sensing Bluetooth Mobility Data: Potentials and Applications - João Filgueiras; Rosaldo J. F. Rossetti; Zafeiris Kokkinogenis; Michel Ferreira; Cristina Olaverri-Monreal; Marco Paiva; João Manuel R. S. Tavares; Joaquim Gabriel
Information related to mobility dynamics constitutes an important factor to be considered in traffic management to improve the efficiency of existing systems. We present a proof-of-concept deployment of sensors using the Bluetooth technology to detect traffic flow conditions. Besides traditional method consisting of a network of stationary sensors, we present a novel approach that uses sensors deployed in moving vehicles that allows new type studies and captures new insights of mobility. Both approaches complement the most common methods of traffic sensing while being more cost-effective and easily available. Early experimental results show the variety of information available through both approaches...

66. GUIA DE PREVENÇÃO EM FASE DE PROJECTO BASEADA NA ANÁLISE DE CERCA DE 2000 ACIDENTES MORTAIS - Alfredo Soeiro

67. The influence of pauses on the fatigue of upper limb muscles during the task of ironing - Ângela Fernandes; Rubim Santos; Nuno Rocha; João Manuel R. S. Tavares
The aim of this study was to analyze the influence of position and pauses on muscle activity and fatigue during the task of ironing. Ten female participants performed the task of ironing in two different positions (standing and sitting) for 10 minutes each with a one-minute pause at the end of each task. Muscle activity and fatigue from the upper trapezium, anterior deltoid and pectoralis major were analyzed using surface electromyography. The results showed that the positions had no significant influence on muscle activity; nevertheless, they had significant influence on muscular fatigue. Also the pauses were possibly beneficial in decreasing...

68. A practical comparison of agile web frameworks - Díaz Clavijo, David

[ES] Los web frameworks son herramientas para mejorar el desarrollo y mantenimiento de sitios web. Aprender a utilizar un framework requiere varios meses y existen más de 100 web frameworks. Por ello es interesante que haya estudios que muestren sus diferencias. En este proyecto se realizó una comparativa de web frameworks para valorar sus diferencias, debilidades y fortalezas. Para seleccionar los web frameworks se utilizaron variables como las estadísticas de uso, popularidad y resultados en otras omparativas. Además, se decidió que los web frameworks seleccionados estuviesen basados en distintos lenguajes de programación. En base a esto se seleccionaron los web...

69. Pontryagin's Maximum Principle for an Impulse Control Problem - Aram V. Arutyunov; Dmitri Yu. Karamzin; Fernando Lobo Pereira

70. UAVs and AUVs Coordination for Ocean Exploration - Sujit Baliyarasimhuni; João B. Sousa; F. Lobo Pereira

71. Mapping the Aveiro Sea Outfall Plume: Sampling Strategy for an Autonomous Underwater Vehicle - Patrícia Ramos; Mário Neves; Fernando Lobo Pereira; Isabel Quintaneiro

72. First and second order necessary conditions of optimality for impulsive control problems - Aram Arutyunov; V. Dykhta; Fernando Lobo Pereira

73. Coordinated Control Strategies for Networked Vehicles: An Application to Autonomous Underwater Vehicles - João Tasso Sousa; Fernando Lobo Pereira

74. Multiple UAV teams for multiple tasks - Sujit Baliyarasimhuni; João B. Sousa; F. Lobo Pereira
In a search and prosecute mission, multiple heterogeneous unmanned aerial vehicles UAVs that carry different resources need to perform the classify, prosecute and battle damage assessment (BDA) tasks on targets sequentially. Depending on the target resource requirement, it may be necessary to deploy a coalition of UAVs to perform the action. In this paper, we propose coalition formation algorithms that have low computational overhead to determine coalitions for the prosecute and the BDA tasks. We also develop a simultaneous strike mechanism based on Dubins curves for the UAVs to prosecute the target simultaneously. Monte-Carlo simulation results are presented to show...

75. Autonomous Underwater Vehicle (AUV) and Remotely Operated Vehicle (ROV) Developments at Porto University - A. Matos; N. Cruz; João Tasso Sousa; Fernando Lobo Pereira

76. Mapping and Initial Dilution Estimation of a Sewage Outfall Plume Using an Autonomous Underwater Vehicle - A Ramos; A. Cunha; Carla Barreto; F. Lobo Pereira

77. SLAM Algorithm Applied to Robotics Assistance for Navigation in Unknown Environments - Fernando Cheein; L. López; Julio Lara; Orosco, E.; F. Lobo Pereira; di Sciascio, F.; Carelli, R.

78. Coordinated control strategies for networked vehicles and systems - J. Borges de Sousa; F. Lobo Pereira

79. A set-valued framework for coordinated motion control of networked vehicles - João Tasso Sousa; Fernando Lobo Pereira
A problem of coordinated control for two networked vehicles is presented, formulated, and solved to illustrate a set-valued framework for the coordinated control of networked vehicles. First, an informal user specification for the coordinated operation of two vehicles is introduced. Second, a formal representation of the objects and relations of interest is presented, and the user requirements are mapped onto a formal specification. Third, the specification is transformed onto a control problem formulation. Finally, the problem is solved using techniques from dynamic optimization and generalizations of the problem are discussed. © Nauka/Interperiodica 2006.

80. A Framework for the Automation of a Remotely Operated Vehicle - Sérgio Fraga; J. Borges de Sousa; F. Lobo Pereira

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