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3rd International Conference on Networking and Services, ICNS 2007

作者： Gilaberte, Raquel Lacuesta Herrero, Lourdes Peñalver Systems Engineering and Computer Department Zaragoza University Spain Systems Computer Department Valencia Polytechnic University Spain

Routing protocols will be a fundamental piece in the operation of ad-hoc networks. These protocols must fulfil the main objective of using valid routes among the different nodes that form the net in a correct and efficient way keeping in mind the possibility that malicious nodes may exist in the net, and protecting the communication of non-allowed accesses. This work presents a proposal of a secure routing protocol adapted to spontaneous ad-hoc networks. © 2007 IEEE.

关键词： Ad hoc networks

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Automatic configuration of ad-hoc networks: Establishing unique IP link-local addresses

Automatic configuration of ad-hoc networks: Establishing uni...

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International Conference on Emerging Security Information, systems, and Technologies, SECURWARE 2007

作者： Gilaberte, Raquel Lacuesta Herrero, Lourdes Peñalver Systems Engineering and Computer Department Zaragoza University Spain Systems Computer Departmen Valencia Polytechnic University Spain

ISBN: (纸本)0769529895

One of the main problems when configuring ad-hoc networks is that with these networks don't have a central server with all the information of the network. If a new user wants to form part of a network must configure his device firstly. On the one hand, in this article we make an analysis of the different proposals for the configuration of ad-hoc networks presented on the bibliography consulted. On the other hand, we propose a distributed protocol to network data configuration based on the use of diffusion tools (multicast/broadcast) and where the user's intervention isn't necessary. The protocol proposed focus on IPv4 link-local addresses configuration to let the creation of MANETs (Mobile Ad hoc Networks). What's more, this protocol will be able to be also used to make both IPv6 link-local addresses configuration and other needed ad hoc networks parameters configuration © 2007 IEEE.

关键词： Internet protocols

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Optimization of RAMS+C for safety instrumented system design with diverse redundancy

Optimization of RAMS+C for safety instrumented system design...

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European Safety and Reliability Conference 2007, ESREL 2007 - Risk, Reliability and Societal Safety

作者： Torres-Echeverría, A.C. Martorell, S. Thompson, H.A. Department of Automatic Control and System Engineering University of Sheffield Sheffield United Kingdom Department of Chemical and Nuclear Engineering Polytechnic University of Valencia Valencia Spain

ISBN: (纸本)0415447860

This paper addresses the optimization of safety instrumented systems design based on a RAMS+C approach using a multi-objective genetic algorithm. The design includes optimization of safety and reliability measures against lifecycle cost, paying special attention to the effect that different diverse redundancy schemes have on common cause failure and thus how they affect the overall system objectives. The safety integrity requirements and modelling detail indicated by the standard IEC 61508 are addressed. The problem is approached as one of redundancy allocation with diversity and design variations. In order to include safety integrity, the Average Probability of Failure on Demand is one objective to optimize. This is complemented with the Spurious Trip Rate (safe failure) and Lifecycle Cost as additional objectives. For demonstration of the overall method, a practical example from chemical industry is used: a protection against high pressure and temperature for a chemical reactor. Three different technologies are available for use per subsystem to implement diversity, at the same time also modifying the diagnostic coverage. © 2007 Taylor & Francis Group.

关键词： systems analysis

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Calculation of the approximated frequency response of sampled-data systems using Kranc Operators

Calculation of the approximated frequency response of sample...

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Electronics, Robotics and Automotive Mechanics Conference

作者： Sandoval, Jesus Salt, Julian Department of Electrical and Electronics Engineering Mérida Institute of Technology Mexico Department of Automatic and Systems Engineering Polytechnic University of Valencia Spain

ISBN: (纸本)9780769529745

A novel method for the approximation of the frequency response of a sampled data system is presented Usually the frequency response calculation of sampled-data systems leads to use of the infinite dimension matrices of cumbersome mathematical) treatment. The technique presented is based on the inclusion of a fictitious sampler in the continuous process output and on the signal flow analysis in the consequent Kranc Operator multirate model obtained by switch decomposition. The main goal of this sampler is to get as much information as it can about the output continuous signal, but finite. The application of this tool will be demonstrated with the calculation of the frequency response of a dual-rate sampled data system, and its validity will be verified by looking correspondence of the results obtained with its time-domain response to a single frequency sine signal input.

关键词： Frequency response

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Analysis of multiactuator panels in the space-time wavenumber domain

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AES: Journal of the Audio engineering Society 2007年第12期55卷 1092-1106页

作者： Pueo, Basilio López, José J. Escolano, José Bleda, Sergio AES Signals Systems and Telecommunications Group Polytechnic School University of Alicante Spain Institute for Telecommunications and Multimedia Applications Technical University of Valencia Spain Telecommunication Engineering Department Polytechnic School University of Jaén Spain

A methodology for the analysis of the radiation characteristics and spatial performance of loudspeaker arrays for wave field synthesis (WFS) reproduction is presented. It is based on the wavenumber domain analysis, where the source radiation is decomposed into plane waves for arbitrary angles of incidence. The method deals with the measurement and analysis of the radiation performance, evaluation of the spatial aliasing frequency, and associated sampling artifacts for linear loudspeaker arrays. A detailed description of the parameters that modify spatial aliasing artifacts, such as array directivity and truncation effects by geometry, is also given. The method is validated at the laboratory with two multiactuator panel arrangements and a dynamic loudspeaker array, all presenting the same transducer spacing. Simulations and experimental results are discussed through several case studies, comparing dynamic loudspeaker arrays and multiactuator panels in WFS operation. Moreover, a study of the consequences for the wavefield when splitting the panels to accommodate a lower number of exciters is also addressed.

关键词： Acoustic signal processing

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Multirate obstacle tracking and path planning for intelligent vehicles

Multirate obstacle tracking and path planning for intelligen...

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2007 IEEE Intelligent Vehicles Symposium, IV 2007

作者： Mora, Marta C. Pizá, Ricardo Tornero, Josep IEEE Mechanical Engineering and Construction Department Jaume I University Spain Systems Engineering and Control Department Technical University of Valencia Spain

ISBN: (纸本)1424410681

This paper introduces a new approach for tracking and path planning for intelligent vehicles. The tracking application takes into account the trajectories followed by the obstacles, making a prediction of their future positions and corresponding uncertainties. This idea introduces a stochastic model for obstacle and vehicle kinematics. A multirate Kalman filter is considered in the tracking process in order to manage the uncertainty. Potential Field approach for path planning is redefined according to the new stochastic models. In particular, the repulsive potential field is modified to consider these models projected into a prediction horizon. The use of future information minimizes the risk of collisions and generates smoother trajectories. ©2007 IEEE.

关键词： Motion planning

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Genetic algorithm in the optimization of the acoustic attenuation systems

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9th International Work-Conference on Artificial Neural Networks

作者： Romero-Garcia, V. Fuster-Garcia, E. Sanchez-Perez, J. V. Garcia-Raffi, L. M. Blasco, X. Herrero, J. M. Sanchis, J. Grupo de Acústica Arquitectónica y Del Medioambiente (ACARMA) Department of Applied Physics Instituto de Matemática Pura y Aplicada Department of Applied Mathematics Predictive Control and Heuristic Optimization Group Department of Systems Engineering and Control Polytechnic University of Valencia

ISBN: (纸本)9783540730064

It is well known that Genetic Algorithms (GA) is an optimization method which can be used in problems where the traditional optimization techniques are difficult to be applied. Sonic Crystals (SC) are periodic structures that present ranges of sound frequencies related with the periodicity of the structure, where the sound propagation is forbidden. This means that in the acoustic spectrum there are ranges of frequencies with high acoustic attenuation. This attenuation can be improved producing vacancies in the structure. In this paper we use a parallel implementation of a GA to optimize those structures, by means of the creation of vacancies in a starting SC, in order to obtain the best acoustic attenuation in a predetermined range of frequencies. The cost function used in CA is based on the Multiple Scattering Theory (MST), which is a self consistent method for calculating acoustic pressure in SCs. As a final result we achieve a quasi ordered structures that presents a high acoustic attenuation in a predetermined range of frequencies, independent of the periodicity of the SC.

关键词： Genetic algorithms

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A note on the implementation of directive sources in discrete time-domain dispersive meshes for room acoustic simulation

A note on the implementation of directive sources in discret...

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123rd Audio engineering Society Convention 2007

作者： Escolano, José López, José J. Pueo, Basilio Cobos, Máximo Telecommunication Engineering Department Polytechnic School of Linares University of Jaén Spain Audio and Communications Group ITEAM Technical University of Valencia Spain Signals Systems and Telecommunications Group Polytechnic School University of Alicante Spain

ISBN: (纸本)9781604239027

The use of wave methods to simulate room impulse responses provides the most accurate solutions. Recently, a method to incorporate directive sources in discrete-time methods, such as Finite Differences and Digital Waveguide Mesh has been proposed. It is based in the proper combination of monopoles in order to achieve the desired directivity pattern in far field condition. However, this method is used without taking into account the inherent dispersion in most of these discrete-time paradigms. This paper analyzes how influent is the dispersion in order to get the proper directivity through different study cases.

关键词： Dispersion (waves)

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Analysis of edge boundary conditions on multiactuator panels

Analysis of edge boundary conditions on multiactuator panels

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123rd Audio engineering Society Convention 2007

作者： Pueo, Basilio Escolano, José López, José J. Bleda, Sergio Signals Systems and Telecommunications Group Polytechnic School University of Alicante Spain Telecommunication Engineering Department Polytechnic School of Linares University of Jaén Spain Audio and Communications Group ITEAM Technical University of Valencia Spain

ISBN: (纸本)9781604239027

Distributed Mode Loudspeakers consist of a flat panel of a light and stiff material to which a mechanical exciter is attached, creating bending waves that are then radiated as sound fields. It can be used to build arrays for Wave Field Synthesis reproduction by using multiple exciters in a single vibrating surface. The exciter interaction with the panel, the panel material and the panel contour clamp conditions are some of the critical points that need to be evaluated and improved. In this paper, we address the edge boundary conditions influence on the quality of the emitted wave field. The measures of the wave fields have been interpreted in the wavenumber domain, where the source radiation is decomposed into plane waves for arbitrary angles of incidence. Results show how the wave field is degraded when the boundary conditions are modified.

关键词： Acoustic fields

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Incorporating a generic model of subcutaneous insulin absorption into the AIDA v4 diabetes simulator: 1. A prospective collaborative development plan

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Journal of Diabetes Science and Technology 2007年第3期1卷 423-435页

作者： Lehmann, Eldon D. Tarín, Cristina Bondia, Jorge Teufel, Edgar Deutsch, Tibor Department of Imaging (MRU) Imperial College of Science Technology and Medicine (NHLI) Royal Brompton Hospital London United Kingdom Department of Imaging University of Toronto ON Canada ITEAM Technical University of Valencia (UPV) Valencia Spain Department of Systems Engineering and Control Technical University of Valencia (UPV) Valencia Spain Department of Informatics and Medical Technology Faculty of Health Care Semmelweis University Budapest Hungary

Introduction: AIDA v4 is an interactive educational diabetes simulator that has been made available, for over a decade, without charge via the Internet. The software is currently freely accessible at http://***. This report sets out a collaborative development plan to enhance the program with a new model of subcutaneous insulin absorption, which permits the simulation of rapidly acting and very long-acting insulin analogues, as well as insulin injection doses larger than 40 ***: A novel, generic, physiological subcutaneous insulin absorption model is overviewed and a methodology is proposed by which this can be substituted in place of the previously adopted insulin absorption model utilized within AIDA v4.3a. Apart from this substitution it is proposed to retain the existing model of the glucoregulatory system currently used in AIDA v4.3a. Results: Initial simulation results based on bench testing of this approach using MATLAB are presented for the exogenous insulin flow profile (Iex) following subcutaneous injections of a rapidly acting insulin analogue, a short-acting (regular) insulin preparation, intermediate-acting insulins (both Semilente and neutral protamine Hagedorn types), and a very long-acting insulin analogue. Discussion: It is proposed to implement this collaborative development plan - first by bench testing the approach in MATLAB and then by integrating the generic subcutaneous insulin absorption Iex model into the AIDA simulator in Pascal. The aim is to provide enhanced functionality and educational simulations of regimens utilizing novel insulin analogues, as well as injections larger than 40 units of insulin. © Diabetes Technology Society.

关键词： Absorption Computer Diabetes Insulin Model Simulation Software

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