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2nd International Conference on Mobile Ubiquitous Computing, systems, Services and Technologies, UBICOMM 2008

作者： Herrera, Moisés Manzano Bonastre, Alberto Capella, Juan V. Department of Systems Engineering and Control Polytechnic University of Valencia Camino de Vera s/n 46022 Valencia Spain Department of Computer Engineering Polytechnic University of Valencia Camino de Vera s/n 46022 Valencia Spain

ISBN: (纸本)9780769533674

The IEEE 802.15.4 protocol is a flexible technology with great potential for wireless sensor networks applications. The standard distinguishes two network modes;beacon-enabled and nonbeacon-enabled. In this paper, the performance study of beaconed and non-beaconed modes of IEEE 802.15.4 is evaluated using on site PER measurements. The tests are carryout in an urban outdoor environment with commercial available equipment. Likewise, the impact of Bluetooth interference over IEEE 802.15.4 modes is evaluated. The results show that Bluetooth interference and the mode selected have effects over the PER. Furthermore, for distances between 3 to 10 meters the PER doesn't show significance distance dependency. © 2008 IEEE.

关键词： Bluetooth

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CityMob: A mobility model pattern generator for VANETs

CityMob: A mobility model pattern generator for VANETs

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ICC 2008 - 2008 IEEE International Conference on Communications Workshops

作者： Martinez, Francisco J. Cano, Juan-Carlos Calafate, Carlos T. Manzoni, Pietro Department of Computer and Systems Engineering University of Zaragoza Spain Department of Computer Engineering Polytechnic University of Valencia Spain

ISBN: (纸本)9781424420513

Ad hoc networking is regarded as an adequate solution to cooperative driving between communicating cars on the road. Deploying and testing these networks, usually known as Vehicular Ad-hoc Networks (VANETs), involves a high cost in the real world, and so simulation is an useful alternative in research. One of the most critical issues in a simulation study of VANETs is the use of a mobility model which resembles, as closely as possible, the real behavior of vehicular traffic. Mobility models are crucial to obtain accurate and meaningful simulation results. In this paper we present CityMob, a mobility pattern generator for VANETs. Citymob allows researchers to easily create urban mobility scenarios, including the possibility to model car accidents. We designed and developed it targeting compatibility with the ns-2 simulator, and we implemented three different mobility models: Simple Model (SM), Manhattan Model (MM) and Downtown Model (DM). Based on a flooding alert protocol we show that the most realistic mobility model to simulate traffic accidents is the Downtown model. We also find that, for flooding to be effective, a moderate number of vehicles is required. ©2008 IEEE.

关键词： Vehicular ad hoc networks

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Performance Study of Non-beaconed and Beacon-Enabled Modes in IEEE 802.15.4 under Bluetooth Interference

Performance Study of Non-beaconed and Beacon-Enabled Modes i...

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International Conference on Mobile Ubiquitous Computing, systems, Services and Technologies (UBICOMM)

作者： Moisés Manzano Herrera Alberto Bonastre Juan V. Capella Department of Systems Engineering and Control Polytechnic University of Valencia Valencia Spain

The IEEE 802.15.4 protocol is a flexible technology with great potential for wireless sensor networks applications. The standard distinguishes two network modes; beacon-enabled and nonbeacon-enabled. In this paper, the performance study of beaconed and non-beaconed modes of IEEE 802.15.4 is evaluated using on site PER measurements. The tests are carryout in an urban outdoor environment with commercial available equipment. Likewise, the impact of Bluetooth interference over IEEE 802.15.4 modes is evaluated. The results show that Bluetooth interference and the mode selected have effects over the PER. Furthermore, for distances between 3 to 10 meters the PER doesn't show significance distance dependency.

关键词： Bluetooth Interference Distance measurement Wireless sensor networks Histograms Frequency modulation Frequency shift keying

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A Notion of Stochastic Input-to-State Stability and Its Application to Stability of Cascaded Stochastic Nonlinear systems

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Acta Mathematicae Applicatae Sinica 2008年第1期24卷 141-156页

作者： Shu-jun Liu Ji-feng Zhang Zhong-ping Jiang Department of Mathematics Southeast University Nanjing 210096 China Key Laboratory of Systems and Control Institute of Systems Science Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100080 China Department of Electrical and Computer Engineering Polytechnic University 5 Metrotech Center Brooklyfl N.Y. 11201 USA

In this paper, the property of practical input-to-state stability and its application to stability of cascaded nonlinear systems are investigated in the stochastic framework. Firstly, the notion of （practical） stochastic input-to-state stability with respect to a stochastic input is introduced, and then by the method of changing supply functions, （a） an （practical） SISS-Lyapunov function for the overall system is obtained from the corresponding Lyapunov functions for cascaded （practical） SISS subsystems.

关键词： Stochastic nonlinear systems Stochastic input-to-state stability （SISS） SISS-Lyapunov function

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Fuzzy logic application to drying kinetics modelling

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IFAC Proceedings Volumes 2008年第2期41卷 2206-2211页

作者： Henry A. Váquiro José Bon José L. Diez Faculty of Agronomic Engineering University of Tolima Ibagué Colombia Department of Food Technology Polytechnic University of Valencia Spain Department of Systems Engineering and Control Polytechnic University of Valencia Camino de Vera 14 46022 Valencia Spain (Tel: +34-963877007 ext. 75794

A Fick's model that includes a Takagi-Sugeno fuzzy model to estimate the effective diffusivity was analyzed. The modelling of drying kinetics on mango trough this diffusional-fuzzy model was compared with the theoretical Fick's model and the empirical Peleg and Weibull models. The identification and validation was performed from experimental drying curves of ripe mango slices (Mangifera indica L. cv. Tommy Atkins) at constant air velocity (4 m/s) and different drying temperatures (40, 50, 60 and 70 °C). The fuzzy sets for the antecedent of Takagi-Sugeno system were identified by the Gustafson-Kessel clustering algorithm and approximated by membership functions of piecewise exponential form. On identification and validation, the diffusional-fuzzy model showed best results than the Fick's model, whereas it showed little difference with the Weibull and Peleg models. The diffusional-fuzzy model keeps the interpretability of Fick's model, improves the process simulation and avoids phenomenon and property considerations which require additional experimental and modelling work.

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Fault diagnosis and modeling of the liquids packaging process. A research based on Petri Nets

Fault diagnosis and modeling of the liquids packaging proces...

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International Conference on control, Automation, Robotics and Vision (ICARCV)

作者： Miguel Angel Trigos Martinez Emilio Garcia Moreno Department of Engineering Systems and Automatic Polytechnic University of Valencia Valencia Spain

Searching for solutions to manufacture industries, which every day deal with problems of faults in their process, that generate economics and humans main losses, an algorithm to construct a Petri Nets based model and diagnoser to isolate and fault detection of discrete events systems is presented. This algorithm is developed in a real process of liquids packaging, where we can see that its implementation allows detecting individuals, simultaneous and dependents faults. The process to construct the model and diagnoser is systematic and useful, and it reduces the problems of combinational explosion, which is the main problem present in other investigations. This research has an excellent projection in intermittent faults diagnosis and hybrids systems.

关键词： Fault diagnosis Liquids Packaging Petri nets Fault detection Manufacturing processes Virtual manufacturing Industrial economics Manufacturing industries Humans

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Applications of a novel tool for analysis and design in the frequency domain of Multirate Sampled-Data control systems

Applications of a novel tool for analysis and design in the ...

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International Conference on Electrical engineering, Computing Science and Automatic control (CCE)

作者： J. Sandoval J. Salt Department of Electrical and Electronic Engineering Mérida Institute of Technology Yucatan Mexico Department of Systems Engineering and Control Valencia Polytechnic University Valencia Spain

This work presents two applications of a novel tool developed for the approximate calculation of behavior in the domain of the frequency of Multirate Sampled-Data control systems. The cases presented here focus on the designing of digital regulators that operate with more than one sampling frequency, the aim being to stabilize the system in closed loop using relatively low sampling frequencies of the plant output.

关键词： Frequency domain analysis control systems Sampling methods Switches Time measurement Regulators Design engineering Mathematical model Chemical analysis Image sampling

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On large multiactuator panels for wave field synthesis applications

On large multiactuator panels for wave field synthesis appli...

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124th Audio engineering Society Convention 2008

作者： Pueo, Basilio Escolano, José López, José Javier Ramos, Germán Signals Systems and Telecommunications Group Polytechnic School University of Alicante Spain Telecommunication Engineering Department Polytechnic School of Linares University of Jaén Spain Institute of Telecommunication and Multimedia Applications Technical University of Valencia Spain Institute for the Appl. of Advanced Information and Communication Tech. Technical University of Valencia Spain

ISBN: (纸本)9781605602950

Wave Field Synthesis (WFS) is a spatial sound rendering technique that generates a true sound field using loudspeaker arrays. Multiactuator Panels (MAPs) are an alternative technology to the dynamic piston loudspeakers, based on the distribute mode operation. Because of its low visual profile and negligible vibration of the panel, MAPs are very suitable for WFS reproduction. However, the size of current prototypes does not allow its use for real immersive environments in which loudspeaker must be integrated as walls or as projection screens. In addition, the extra area of a large panel can be used to accommodate extra exciters with which to generate sound fields at another elevation levels. In this paper, a large MAP prototype is presented that has been designed and built to fulfill the requirements of immersive audio applications. It represents a step forward in the applications of MAPs for immersing scenarios. The panel size enhances its acoustic behaviour in the low frequency range. Also, it can be employed for relative large projection screens for videoconferencing and for virtual reality.

关键词： Loudspeakers

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Evaluation of internal validity measures in short-text corpora

Evaluation of internal validity measures in short-text corpo...

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9th International Conference on Intelligent Text Processing and Computational Linguistics

作者： Ingaramo, Diego Pinto, David Rosso, Paolo Errecalde, Marcelo Development and Research Laboratory in Computacional Intelligence (LIDIC) UNSL Argentina Natural Language Engineering Lab. Department of Information Systems and Computation Polytechnic University of Valencia Spain Faculty of Computer Science (FCC) BUAP Mexico

ISBN: (纸本)9783540781349

Short texts clustering is one of the most difficult tasks in natural language processing due to the low frequencies of the document terms. We are interested in analysing these kind of corpora in order to develop novel techniques that may be used to improve results obtained by classical clustering algorithms. In this paper we are presenting an evaluation of different internal clustering validity measures in order to determine the possible correlation between these measures and that of the F-Measure, a well-known external clustering measure used to calculate the performance of clustering algorithms. We have used several short-text corpora, in the experiments carried out. The obtained correlation with a particular set of internal validity measures let us to conclude that some of them may be used to improve the performance of text clustering algorithms.

关键词： Clustering algorithms

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Real-time clothoid approximation by Rational Bezier curves

Real-time clothoid approximation by Rational Bezier curves

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IEEE International Conference on Robotics and Automation (ICRA)

作者： Nicolas Montes Alvaro Herraez Leopoldo Armesto Josep Tornero Systems Engineering and Control Department Technical University of Valencia Valencia Spain Design and Manufacturing of Valencia Valencia Spain

This paper presents a novel technique for implementing Clothoidal real-time paths for mobile robots. As first step, rational Bezier curves are obtained as approximation of the Fresnel integrals. By rescaling, rotating and translating the previously computed RBC, an on-line Clothoidal path is obtained. In this process, coefficients, weights and control points are kept invariant. This on-line approach guarantees that an RBC has the same behavior as the original Clothoid using a low curve order. The resulting Clothoidal path allows any two arbitrary poses to be joined in a plane. RBCs working as Clothoids are also used to search for the shortest bounded-curvature path with a significant computational cost reduction. In addition to this, the proposed technique is tested on a real mobile robot for trajectory generation and kinematic control. To the authors' knowledge, the present approach is the first technique which allows real-time Clothoidal path computation .

关键词： Function approximation Fresnel reflection Mobile robots Computational efficiency Testing Weight control Robotics and automation Roads Design automation Path planning

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