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3rd International Conference on PErvasive Technologies Related to Assistive Environments, PETRA 2010

作者： Seto, Edmund Martin, Eladio Yang, Allen Yan, Posu Gravina, Raffaele Lin, Irving Wang, Curtis Roy, Michael Shia, Victor Bajcsy, Ruzena School of Public Health University of California Berkeley CA 94720 United States Electrical Engineering and Computer Sciences University of California Berkeley CA 94720 United States Wireless Sensor Networks Lab Telecom Italia Berkeley CA 94720 United States Department of Electronics Informatics and Systems University of Calabria Rende Italy

ISBN: (纸本)9781450300711

We present a mobile platform for body sensor networking based on a smartphone for lightweight signal processing of sensor mote data. The platform allows for local processing of data at both the sensor mote and smartphone levels, reducing the overhead of data transmission to remote services. We discuss how the smartphone platform not only provides the ability for wearable signal processing, but it allows for opportunistic sensing strategies, in which many of the onboard sensors and capabilities of modern smartphones may be collected and fused with body sensor data to provide environmental and social context. We propose that this can help refine data reduction at the local level. We describe three examples related to health and wellness, to which our system has been *** © 2010 ACM.

关键词： Smartphones

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Recognition of Wobbling and Nutating Cone-shaped targets

Recognition of Wobbling and Nutating Cone-shaped targets

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2010 IEEE International Conference on Intelligent Computing and Intelligent Systems(2010 IEEE 智能计算与智能系统国际会议 ICIS 2010)

作者： Hanqing Ding Yongsheng Guan School of Computer and Communication Engineering Zhengzhou University of Light Industry Zhengzhou C State Key Lab.of Integrated Service Networks Xidian University Xi'an China

ISBN: (纸本)9781424465828

Recognition of wobbling and nutating cone-shaped targets is a major challenge in space target recognition area. In this paper, we develop a signal model of multiple scattering centers on the wobbling and nutating cone-shaped targets, analyze the microDoppler characteristics of their echo. It is concluded that the micro-Doppler features have remarkable differences due to their different micromotion. Therefore, we apply viterbi algorithm to extract the micro-Doppler and micro-motion parameters, the simulation results demonstrate that the wobbling and nutating cone-shaped targets can be recognized effectively in this way.

关键词： recognition multi-scatters viterbi algorithm nutating wobbling

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PAPR Reduction in All-optical OFDM Systems Based on Phase Pre-emphasis

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Journal of Physics: Conference Series 2011年第1期276卷

作者： Zhou He Wei Li Zhiyong Tao Ji ng Shao Xiaojun Liang Zhuanhua Deng Dexiu Huang Wuhan National Lab for Optoelectronics Department of Optoelectronics Engineering Huazhong University of Science and Technology Wuhan 430074 P.R.China State Key Laboratory of Optical Communication Technologies and Networks Wuhan Research Institute of Posts and Telecommunications Wuhan 430074 P.R.China School of Computer Science and Technology Hubei University of Economics Wuhan 430205 P.R.China

This paper investigates the peak-to-average power ratio (PAPR) theory in all-optical orthogonal frequency division multiplexing (OFDM) optical fibre communication systems. We find out that phase pre-emphasis could effectively reduce PAPR in all-optical OFDM communication systems which employ intensity modulation-direct detection (IM-DD) method. An equation is developed and proposed to calculate suitable phasing values for pre-emphasis. Furthermore, we find out that phase pre-emphasis cannot reduce PAPR effectively in all-optical OFDM systems that employ Phase Shift Keying (PSK) or Quadracture Amplitude Modulation (QAM) method.

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Controlled Gossiping in Ad Hoc networks

Controlled Gossiping in Ad Hoc Networks

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IEEE Conference on Wireless Communications and Networking

作者： Ivan S. Lysiuk Zygmunt J. Haas Genesys Telecommunication Laboratories Alcatel-Lucent Technologies Inc. Daly CA USA Wireless Networks Lab School of Electrical and Computer Engineering Cornell University Ithaca NY USA

Gossiping, a probabilistic algorithm for network-wide broadcasting, can significantly reduce the number of transmissions in one-to-all message spread. Based on the Continuum Percolation Theory, we develop a novel analytical model of gossiping for wireless ad hoc networks. This model provides an intuitive way for setting the gossiping probability, so that a gossip achieves high degree of network coverage with limited number of transmissions. We also propose and study a distributed gossiping scheme, in which nodes set their gossiping probabilities according to locally acquired information. Both gossiping schemes are demonstrated to be scalable; i.e., for fixed network area, the expected number of gossip transmissions does not depend on the number of nodes in the network. The analytical results are verified via simulations of large ad hoc networks.

关键词： Ad hoc networks Broadcasting Peer to peer computing Analytical models USA Councils Mobile ad hoc networks Routing Algorithm design and analysis Communications Society Communication system control

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Iterative Design of MIMO Radar Transmit Waveforms and Receive Filter Bank

Iterative Design of MIMO Radar Transmit Waveforms and Receiv...

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IEEE International Conference on Acoustics, Speech, and Signal Processing

作者： Y.-C. Wang Hongwei Liu Z.-Q. Luo State Key Laboratory on Integrated Service Networks Xidian University Xi'an 710071 China. Currently Y.-C Wang is a post doctorial fellow at the University of Minnesota National Lab of Radar Signal Processing Xidian University Xi'an 710071 China Department of Electrical Computer Science Engineering University of Minnesota Minneapolis 55455 USA

ISBN: (纸本)9781424442959

In this paper, we propose an iterative design approach to jointly optimize probing signal waveforms and a receive filter bank for a multiple-input multiple-output (MIMO) radar under a constant modulus constraint. The design goals are to approximate a desired beampattern and to minimize the auto/cross- correlation levels of the probing signal waveforms for different time lags and between different spatial angles. Since the overall design problem is nonconvex, we propose to optimize the transmit probing signals and receive filter bank separately and alternately. The optimization of receive filter bank is a standard least squares problem, while the optimization of the constant modulus transmit signal waveforms is a norm-constrained least squares problem which can be approximately solved using a low-rank semidefinite relaxation procedure. We demonstrate the effectiveness of our proposed approach through a simulation example.

关键词： Multiple-input multiple-output (MIMO) radar Beampattern Mismatched filter bank Constant modulus probing signal Auto correlation peak sidelobes Cross correlation Level signal waveform Filter banks design target Banks MIMO radar TRANSMITTING Exploration with a probe Iterative design problems

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MoMi: Model-based diagnosis middleware for sensor networks

MoMi: Model-based diagnosis middleware for sensor networks

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MidSens'09 - 4th International Workshop on Middleware Tools, Services and Run-Time Support for Sensor networks, Co-located with the 10th ACM/IFIP/USENIX International Middleware Conference

作者： De Jong, Adriaan Woehrle, Matthias Langendoen, Koen Embedded Software Group Delft University of Technology Netherlands Computer Engineering and Networks Lab. ETH Zurich Switzerland

ISBN: (纸本)9781605588513

Numerous deployments of Wireless Sensor networks (WSNs) have shown that intricate problems are introduced by deploying sensor nodes in an unknown and dynamic environment. Consequently, a vital part of a WSN deployment is the supervision of the sensor nodes and detection of abnormalities in their operation. Previous approaches have devised hand-crafted solutions to detect application-specific problems. This work proposes a generic middleware component, named MoMi, to detect such problems in a systematic way. Given a description of normal system behavior MoMi uses a Model-Based Diagnosis (MBD) framework to present the likely causes of system abnormalities to an administrator. This paper demonstrates a proof of concept implementation of MBD on sensor nodes and presents examples of its applicability for typical WSN applications. Copyright 2009 ACM.

关键词： Sensor nodes

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XPM statistics in 100% pre-compensated WDM transmission for different modulation formats and transmission fibres

XPM statistics in 100% pre-compensated WDM transmission for ...

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2009 14th OptoElectronics and Communications Conference, OECC 2009

作者： Fan, Zhang State Key Lab. of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University Beijing 100871 China

XPM statistics in 100% pre-compensated WDM transmission depends on bit rates, transmission fibres and modulation formats. XPM in DPSK systems shows much less stochastic than that in OOK systems. © 2009 IEEE.

ISBN: (纸本)9781424441037

关键词： Stochastic systems

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Investigating and exploiting the bias of the weighted hypervolume to articulate user preferences

Investigating and exploiting the bias of the weighted hyperv...

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11th Annual Genetic and Evolutionary Computation Conference, GECCO-2009

作者： Auger, Anne Bader, Johannes Brockhoff, Dimo Zitzler, Eckart TAO Team INRIA Saclay LRI Paris Sud University 91405 Orsay Cedex France Computer Engineering and Networks Lab. ETH Zurich 8092 Zurich Switzerland

ISBN: (纸本)9781605583259

Optimizing the hypervolume indicator within evolutionary multiobjective optimizers has become popular in the last years. Recently, the indicator has been generalized to the weighted case to incorporate various user preferences into hypervolume-based search algorithms. There are two main open questions in this context: (i) how does the specified weight influence the distribution of a fixed number of points that maximize the weighted hypervolume indicator? (ii) how can the user articulate her preferences easily without specifying a certain weight distribution function? In this paper, we tackle both questions. First, we theoretically investigate optimal distributions of μ points that maximize the weighted hypervolume indicator. Second, based on the obtained theoretical results, we propose a new approach to articulate user preferences within biobjective hypervolume-based optimization in terms of specifying a desired density of points on a predefined (imaginary) Pareto front. Within this approach, a new exact algorithm based on dynamic programming is proposed which selects the set of μ points that maximizes the (weighted) hypervolume indicator. Experiments on various test functions show the usefulness of this new preference articulation approach and the agreement between theory and practice. Copyright 2009 ACM.

关键词： Distribution functions

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A novel biometric-based authentication scheme with privacy protection

A novel biometric-based authentication scheme with privacy p...

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5th International Conference on Information Assurance and Security, IAS 2009

作者： Huixian, Li Liaojun, Pang School of Computer Science and Engineering Northwestern Polytechnical University Xi'an China Ministry of Education Key Lab. of Comput. Networks and Information Security Xidian University Xi'an China

ISBN: (纸本)9780769537443

Since biometric data are unique and permanent characteristics of individuals, the privacy protection of biometric authentication schemes has become a common concern of the public. Recently, Tang et al. proposed a biometric-based authentication scheme in an attempt to solve the privacy concerns. However, their scheme cannot resist the attack of tamper. Motivated by these concerns, in this paper, we proposed a new biometric-based authentication scheme, which achieves identity privacy and transaction untraceability. Its security is based on the semantic security of the ElGamal algorithm. Analysis results show that our scheme is higher in efficiency than Tang et al. scheme does, and meanwhile, it can resist the tamper attack. It is concluded that the proposed scheme is more secure and more practical than the existing ones. © 2009 IEEE.

关键词： Authentication

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Layer key management scheme on wireless sensor networks

Layer key management scheme on wireless sensor networks

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5th International Conference on Information Assurance and Security, IAS 2009

作者： Pei, Qingqi Wang, Lei Yin, Hao Pang, Liaojun Tang, Hong Institute of China Electronic System Engineering Corporation Beijing 100039 China Key Lab. of Computer Networks and Information Security of Ministry of Education Xidian University Xi'an 710071 China

ISBN: (纸本)9780769537443

Wireless sensor networks are open architectures, so any potential threat can easily intercept, wiretap and counterfeit the information. Therefore, the safety of WSN is very important. Since any single key system cannot guarantee the security of the wireless sensor network for communications, this paper introduces a hierarchical key management scheme based on the different abilities of different sensor nodes in the clustered wireless sensor network. In this scheme, the nodes are distributed into several clusters, and a cluster head must be elected for each cluster. Private communication between cluster heads is realized through the encryption system based on the identity of each head while private communication between cluster nodes in a same cluster head is achieved through the random key preliminary distribution system. For cluster head node plays a pivotal role in this scheme, a trust management system should be introduced into the election of the cluster head which will exclude the malicious node from outside the cluster, thus improve the whole network security. © 2009 IEEE.

关键词： Network security

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