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作者： Liu, Shengjun Wang, Charlie C.L. School of Mathematical Science and Computing Technology Central South University China Department of Mechanical and Automation Engineering Chinese University of Hong Kong Hong Kong

Radial Basis Function (RBF) has been used in surface reconstruction methods to interpolate or approximate scattered data points, which involves solving a large linear system. The linear systems for determining coefficients of RBF may be ill-conditioned when processing a large point set, which leads to unstable numerical results. We introduce a quasi-interpolation framework based on compactly supported RBF to solve this problem. In this framework, implicit surfaces can be reconstructed without solving a large linear system. With the help of an adaptive space partitioning technique, our approach is robust and can successfully reconstruct surfaces on non-uniform and noisy point sets. Moreover, as the computation of quasi-interpolation is localized, it can be easily parallelized on multi-core CPUs. © 2012 Elsevier B.V.

关键词： Linear systems

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Adaptive neural network control of robot with passive last joint 1

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5th International Conference on Intelligent Robotics and Applications, ICIRA 2012

作者： Yang, Chenguang Li, Zhijun Li, Jing Smith, Alex School of Computing and Mathematics Plymouth University United Kingdom Department of Automation Shanghai Jiao Tong University Shanghai China Department of Mathematics Xidian University China College of Automation Science and Engineering South China University of Technology China

ISBN: (数字)9783642335037

ISBN: (纸本)9783642335020

Adaptive control of a robot manipulator with a passive joint (which has neither an actuator nor a holding brake) is investigated. With the aim to shape the controlled manipulator dynamics to be of minimized motion tracking errors and joint accelerations, we employ a linear quadratic regulator (LQR) optimization technique to obtain an optimal reference model. Adaptive neural network (NN) control has been developed to ensure the reference model can be matched in finite time, in the presence of various uncertainties. © Springer-Verlag Berlin Heidelberg 2012.

关键词： Neural networks

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Multi-agent swarm based localization of hazardous events

Multi-agent swarm based localization of hazardous events

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作者： Varga, Maja Piskovic, Zvonimir Bogdan, Stjepan Li, Zhijun Lausanne Switzerland Faculty of Electrical Engineering and Computing University of Zagreb Unska 3 10000 Zagreb Croatia Department of Automation Shanghai Jiao Tong University China

Swarm robotic concept has become a topic of extensive research in hazardous environments where fault tolerant, robust and energy-efficient approach is needed. In this paper we present behavioural based algorithm for outdoor environment exploration. This work is inspired by ant colony behaviour models. Our goal is to control agent's motion using simple rules and not to rely on wireless communication. Agents perform random walk combined with simple heuristic pheromone based rules which prevent frequent visits of previously visited locations. To determine heuristic parameters which maximize area coverage, we optimize parameters by simulating swarm behaviour in Matlab. Furthermore, we take into account the agent limitations, such as battery lifetime, and we model a probability success of a mission with respect to that parameter.

关键词： Multi agent systems

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CEDAR: An Optimal and Distributed Strategy for Packet Recovery in Wireless Networks

CEDAR: An Optimal and Distributed Strategy for Packet Recove...

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IEEE INFOCOM

作者： Chenxi Qiu Haiying Shen Sohraab Soltani Karan Sapra Hao Jiang Jason Hallstrom Department of Electrical and Computer Engineering Clemson University Clemson SC 29634 USA Intelligent Automation Inc. Rockville MD 20855 USA School of Computing Clemson University Clemson SC 29634 USA

ISBN: (纸本)9781467359443

Underlying link-layer protocols of wireless networks use the conventional "store and forward" design paradigm cannot provide highly sustainable reliability and stability in wireless communication, which introduce significant barriers and setbacks in scalability and deployments of wireless networks. In this paper, we propose a Code Embedded Distributed Adaptive and Reliable (CEDAR) link-layer framework that targets low latency and high throughput. CEDAR is the first comprehensive theoretical framework for analyzing and designing distributed and adaptive error recovery for wireless networks. It employs a theoretically-sound framework for embedding channel codes in each packet and performs the error correcting process in selected intermediate nodes in packet's route. To identify the intermediate nodes for the en/decoding for minimizing average packet latency, we mathematically analyze the average packet delay, using Finite State Markovian Channel model and priority queuing model, and then formalize the problem as a non-linear integer programming problem. Also, we propose a scalable and distributed scheme to solve this problem. The results from real-world testbed "NESTbed" and simulation with Matlab prove that CEDAR is superior to the schemes using hop-by-hop decoding and destination-decoding not only in packet delay but also in throughput. In addition, the simulation results show that CEDAR can achieve the optimal performance in most cases.

关键词： Wireless networks Packet intermediate node Scalability Cedrus Channel coding system recovery Distribute Throughput CARRIER SYSTEM optimum performance MATLAB

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Laboratory education experiences in the development of advanced digital TV services

Laboratory education experiences in the development of advan...

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2012 IEEE Global engineering Education Conference, EDUCON 2012

作者： Andreas, Papadakis Marios-Georgios, Panaousis Costas, Alafodimos Athens Greece Faculty of Science Engineering and Computing Kingston University London United Kingdom Department of Automation Technological Education Institute of Piraeus TEI Piraeus Egaleo-Athens Greece

In this work we have composed an innovative environment for the development of interactive TV applications. This has been evaluated in the context of laboratory exercises by students. We present the environment as well as the results gained when the students changed their role from passive TV viewers to application developers. © 2012 IEEE.

关键词： Digital television

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Energy-efficient packet relaying based on the sensing relevancies of source nodes in visual sensor networks

Energy-efficient packet relaying based on the sensing releva...

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2012 9th IEEE International Workshop on Factory Communication Systems, WFCS 2012

作者： Costa, Daniel G. Guedes, Luiz Affonso Vasques, Francisco Portugal, Paulo Department of Computing and Automation Federal University of Rio Grande Do Norte Brazil Department of Technology State University of Feira de Santana Brazil IDMEC/ISR Faculty of Engineering University of Porto Portugal

ISBN: (纸本)9781467315739

When packets are transmitted over braided-paths in visual sensor networks some intermediate nodes may relay most part of the traffic, turning part or the entire network inactive when they run out of energy. Due to the nature of visual monitoring, source nodes may have different relevancies for the application, according to the desired monitoring tasks and the current sensors' poses and fields of view. Based on such relevancies, packets transmitted from different source nodes will have different relaying priorities, which are associated with energy thresholds. We propose an energy-efficient relay scheme where packets are forwarded to the next hop toward the sink only if the associated energy threshold is below the current energy level of the relaying node. Doing so, energy saving is achieved potentially prolonging the network lifetime, but with reduced impact to the overall monitoring quality of the application. © 2012 IEEE.

关键词： Energy efficiency

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QoV: Assessing the monitoring quality in visual sensor networks

QoV: Assessing the monitoring quality in visual sensor netwo...

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2012 IEEE 8th International Conference on Wireless and Mobile computing, Networking and Communications, WiMob 2012

ISBN: (纸本)9781467314305

Camera-enabled sensor nodes deployed for visual monitoring can considerably enlarge the applicability of wireless sensor networks. Due to the stringent requirements of visual data transmission and processing, when compared with scalar wireless sensor networks, quality assessment becomes a relevant issue. Although academic investigation has been focused on QoS parameters such as end-to-end delay, throughput and packet error rate, what is being seen by source nodes may be more important for the application than the quality of received data. In such way, we propose the novel concept of Quality of Viewing (QoV) to be employed as an important QoS parameter when assessing the monitoring quality in visual sensor networks. Some issues for the establishment of the QoV of monitoring applications will be presented, as well as practical exploitation of this parameter for dynamic verification, control and management of wireless sensor networks composed of camera-enabled source nodes. © 2012 IEEE.

关键词： Cameras

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Effect of frame size on energy consumption in wireless image sensor networks

Effect of frame size on energy consumption in wireless image...

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2012 IEEE International Conference on Imaging Systems and Techniques, IST 2012

ISBN: (纸本)9781457717741

Wireless sensor networks composed of camera-enabled source nodes can provide visual information of an area of interest, potentially enriching monitoring applications. While few bytes can represent scalar data, even low-resolution still images may require thousand of bytes, turning data fragmentation into a relevant design issue. Different optimization approaches have been proposed in recent years to achieve energy saving in wireless image sensor networks. However, the impact of image fragmentation upon the adopted MAC technology has been neglected in most cases. In this work we investigate the effect of frame size on image transmissions over wireless sensor networks, linking the maximum frame size, the useful payload and the frame error rate effects. Additionally, we discuss different approaches for transmissions of DWT-based encoded images and the impact of inserting application-specific information into the frame header. We believe that our discussions can contribute to the advance of the design of wireless image sensor networks. © 2012 IEEE.

关键词： Energy utilization

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Journal of Energy and Power engineering 2012年第5期6卷 826-832页

作者： Zlatko Hanic Mario Vrazic Stjepan Stipetic Department of Electrical Machines Drives and Automation Faculty of Electrical Engineering and Computing University of ZagrebZagreb 10000 Croatia

This paper addresses some of the problems related to direct surface temperature measurement of a salient pole synchronous generator excitation winding in rotation. Excitation winding temperature is used for determining the dynamic limit in a PQ diagram. The paper also addresses procedures of improving the accuracy of surface temperature measurement using the contact DS 18B20 digital temperature probes. The paper also provides experimental results of direct temperature measurement of the excitation winding surface conducted in the salient pole synchronous generator in the rotation.

关键词： Temperature measurement AC machines synchronous generators excitation winding wireless sensing digital temperature sensors.

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Stability of Markovian jump systems over networks via delta operator approach

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Circuits, Systems, and Signal Processing 2012年第1期31卷 107-125页

作者： Yang, Hongjiu Xia, Yuanqing Shi, Peng Fu, Mengyin Department of Automatic Control Beijing Institute of Technology Beijing 100081 China Department of Computing and Mathematical Sciences University of Glamorgan Pontypridd CF37 1DL United Kingdom School of Engineering and Science Victoria University Melbourne 8001 VIC Australia Faculty of Automation Harbin University of Science and Technology Harbin China

This paper investigates the problem of stability for a class of linear uncertain Markovian jump systems over networks via the delta operator approach. The sensor-to-controller random network-induced delay and arbitrary packet losses are considered for mode-dependent time delays. That is, a Markov process is used to model the time-varying delays which are dependent on the system mode. Based on the Lyapunov-Krasovskii functional in the delta domain, a new sufficient condition for the solvability of the stability problem is presented in terms of linear matrix inequalities. A numerical example is given to illustrate the effectiveness of the techniques developed. © Springer Science+Business Media, LLC 2011.

关键词： Networked control systems

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