Friday, April 18, 2014



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Nomenclatura Unesco > (33) Ciencias Tecnológicas

Mostrando recursos 21 - 40 de 2,076

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

22. 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...

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

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

25. 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.

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

27. 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.

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

29. Nondegenerate Necessary Conditions of Optimality for Problems Without Normality Assumptions - F. Lobo Pereira; Aram Arutyunov

30. A Importância da Tribologia para a Manutenibilidade no Projecto de Novos Equipamentos - L. A. Ferreira

31. Video summary - Neptus, command and control infrastructure for heterogeneous teams of autonomous vehicles - Paulo Sousa Dias; José Queirós Pinto; Rui Gomes; Gil Manuel Gonçalves; João Tasso Sousa; Fernando Lobo Pereira
This video shows a brief overview over Neptus, a command and control infrastructure for heterogeneous teams of autonomous vehicles. Having different types of vehicles at our laboratory and from our partners, there was an increasing need to create a common infrastructure to all these systems. Additionally, a tool to support the entire mission life cycle (Planning, Execution, Review and Dissemination) was lacking. Neptus was created to provide vehicle independence and seamless inter-systems communications. Currently, Neptus has been already tested with Remotely Operated Vehicles, Autonomous Underwater Vehicles, Unmanned Air Vehicles, Autonomous Surface Vehicles and Wireless Sensor Networks. Some of these systems...

32. Optimização dinâmica para planeamento de movimento e controlo de veículos autónomos - Sérgio Fraga; João Tasso Sousa; Fernando Lobo Pereira

33. Second-order Necessary Conditions of Optimality for Abnormal Solutions of Nonlinear Problems with Equality and Inequality Constraints - Aram V. Arutyunov; Dmitri Yu. Karamzin; Fernando Lobo Pereira

34. A Reachable Set Estimation Algorithm for Impulsive Control Systems - E. Goncharova; V. Baturin; J. Borges de Sousa; F. Lobo Pereira

35. Operations with Multiple Autonomous Underwater Vehicles Operations: The PISCIS project - N. Cruz; A. Matos; João Tasso Sousa; Fernando Lobo Pereira; J. Silva; J. Coimbra; E. B. Dias

36. Pontryagin's Maximum Principle for Impulsive Control Problems with Mixed Constraints - Aram Arutyunov; Dmitry Karamzin; F. Lobo Pereira

37. A New ROV Design: Issues on Low Drag and Mechanical Symmetry - Rui Gomes; Alexandre Sousa; Sérgio Fraga; Alfredo Manuel Martins; João Tasso Sousa; Fernando Lobo Pereira

38. PISCIS: Multiple Autonomous Underwater Vehicles Operations - N. Cruz; A. Matos; João Tasso Sousa; Fernando Lobo Pereira; J. Silva; J. Coimbra; E. B. Dias

39. Coordinated Control of Networked Vehicle Systems: Specification and Control Synthesis - J. Borges de Sousa; F. Lobo Pereira

40. Some Recent Developments in Necessary Conditions of Optimality for Impulsive Control Problems - F. Lobo Pereira
Necessary conditions of optimality for impulsive control systems whose dynamics are defined by differential inclusions and whose state trajectory is subject to state constraints endpoint constraints are discussed. After discussing the motivation of this general control paradigm in the context of space systems, a natural concept of robust solution is introduced and some of his properties presented. Besides an independent interest for the construction of schemes approximating impulsive con- trol processes by conventional ones, it is shown in a brief outline of the proof how these properties play an important role in the derivation of the considered optimal- ity conditions....

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