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A Cross-layer Optimized distributed Scheduling Algorithm for Peer-to-Peer Video Streaming over Multi-hop Wireless Mesh Networks

A Cross-layer Optimized Distributed Scheduling Algorithm for...

引用

ieee Communications Society conference on sensor and Ad Hoc Communications and Networks (SECON)

作者： Haiyan Luo Song Ci Dalei Wu Department of Computer and Electronics Engineering University of Nebraska Lincoln USA

Peer-to-Peer (P2P) video streaming services on the Internet have gained increasing popularity during the past few years. However, many problems still need to be addressed before it can be widely deployed in the wireless environment. the existing P2P overlay network architecture hides the underlying network topology, assuming channel quality is always in perfect condition. this works well for the Internet-based services, but hardly meets the user-perceived video quality requirement in wireless environments due to the time-varying nature of wireless channels. Inspired by the tightly-coupled relationship between P2P overlay networks and the underlying networks, we propose a novel scheduling algorithm on the basis of a quality-driven cross-layer design framework to jointly optimize the parameters of different network layers to achieve highly- improved video quality for P2P video streaming applications in multi-hop wireless mesh networks. In this paper, the quality-driven P2P scheduling algorithm is formulated into a distributed distortion-delay optimization problem, where the expected video distortion is minimized under the constraint of a given packet playback deadline to select the optimal combination of system parameters residing in different network layers. then we provide the algorithmic solution to the formulated problem based on dynamic programming. the distributed optimization running on each partner node adopted in the scheduling algorithm greatly reduces the computational intensity. Extensive experimental results demonstrate 5-15dB quality enhancement in terms of PSNR by using the proposed scheduling algorithm.

关键词： Scheduling algorithm Peer to peer computing Streaming media Spread spectrum communication Wireless mesh networks Web and internet services Network topology Cross layer design Design optimization Constraint optimization

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Selection and Orientation of Directional sensors for Coverage Maximization

Selection and Orientation of Directional Sensors for Coverag...

引用

ieee Communications Society conference on sensor and Ad Hoc Communications and Networks (SECON)

作者： Giordano Fusco Himanshu Gupta Computer Science Department Stony Brook University Stony Brook NY USA

sensor nodes may be equipped with a "directional" sensing device (such as a camera) which senses a physical phenomenon in a certain direction depending on the chosen orientation. In this article, we address the problem of selection and orientation of such directional sensors with the objective of maximizing coverage area. Prior works on sensor coverage have largely focused on coverage with sensors that are associated with a unique sensing region. In contrast, directional sensors have multiple sensing regions associated with them, and the orientation of the sensor determines the actual sensing region. thus, the coverage problems in the context of directional sensors entails selection as well as orientation of sensors needed to activate in order to maximize/ensure coverage. In this article, we address the problem of selecting a minimum number of sensors and assigning orientations such that the given area (or set of target points) is k-covered (i.e., each point is covered k times). the above problem is NP-complete, and even NP-hard to approximate. thus, we design a simple greedy algorithm that delivers a solution that k-covers at least half of the target points using at most M log(k|C|) sensors, where |C| is the maximum number of target points covered by a sensor and M is the minimum number of sensor required to k-cover all the given points. the above result holds for almost arbitrary sensing regions. We design a distributed implementation of the above algorithm, and study its performance through simulations. In addition to the above problem, we also look at other related coverage problems in the context of directional sensors, and design similar approximation algorithms for them.

关键词： Greedy algorithms Algorithm design and analysis sensor phenomena and characterization Cameras Approximation algorithms Peer to peer computing Communications Society Computer science Monitoring Organizations

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A mixed inertial & RF-ID orientation tool for the visually impaired

A mixed inertial & RF-ID orientation tool for the visually i...

引用

ieee SSD international Multi-conference on systems, Signals and Devices

作者： Bruno Ando Salvatore Baglio Vincenzo Marletta Nicola Pitrone Dipartimento di Ingegneria Elettrica Elettronica e dei Sistemi Universita Catania Catania Italy

the possibility to provide visual impaired walking in an unfamiliar environment with an optimized degree of information about the presence of services and hazards is of primary importance to improve their autonomy and self estimate. In this paper, a mixed inertial & RF-ID orientation aid for the visually impaired is proposed to assist visually impaired people exploring an unfamiliar environment. the system developed aims to notify the presence of services and hazards. Main advantages of the system developed, as respect to the State of the Art, are the continuous monitoring of users position in the environment, the optimized redundancy of information to be provided to the user, the high re-configurability and flexibility, the poor demanding installation and maintenance, the low cost and the adaptive level of assistance to be provided to the user on the basis of his/her needs, ability and skills.

关键词： Hazards Monitoring Redundancy Global Positioning System Legged locomotion Navigation sensor systems Cost function Handicapped aids Computer interfaces

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Efficient data aggregation in multi-hop wireless sensor networks under physical interference model

Efficient data aggregation in multi-hop wireless sensor netw...

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ieee Internatonal conference on Mobile Adhoc and sensor systems (MASS)

作者： Xiang-Yang Li XiaoHua Xu ShiGuang Wang ShaoJie Tang GuoJun Dai JiZhong Zhao Yong Qi Department of Computer Science Illinois Institute of Technology Chicago USA Institute of Computer Application Technology Hangzhou Dianzi University Hangzhou China School of Science and Technology Xi''an Jiaotong University Xi'an China

ISBN: (纸本)9781424451142

Efficient aggregation of data collected by sensors is crucial for a successful application of wireless sensor networks (WSNs). Both minimizing the energy cost and reducing the time duration (or called latency) of data aggregation have been extensively studied for WSNs. Algorithms with theoretical performance guarantees are only known under the protocol interference model, or graph-based interference models generally. In this paper, we study the problem of designing time efficient aggregation algorithm under the physical interference model. To the best of our knowledge, no algorithms with theoretical performance guarantees are known for this problem in the literature. We propose an efficient algorithm that produces a data aggregation tree and a collision-free aggregation schedule. We theoretically prove that the latency of our aggregation schedule is bounded by O(R + Delta) time-slots. Here R is the network radius and Delta is the maximum node degree in the communication graph of the original network. In addition, we derive the lower-bound of latency for any aggregation scheduling algorithm under the physical interference model. We show that the latency achieved by our algorithm asymptotically matches the lower-bound for random wireless networks. Our extensive simulation results corroborate our theoretical analysis.

关键词： Spread spectrum communication Wireless sensor networks Interference Delay Scheduling algorithm Costs Protocols Algorithm design and analysis Tree graphs Wireless networks

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Substrate influence on the characteristics of interdigital-electrode gas sensors

Substrate influence on the characteristics of interdigital-e...

引用

ieee SSD international Multi-conference on systems, Signals and Devices

作者： A. Fischerauer Ch. Schwarzmuller G. Fischerauer Chair of Measurement and Control Engineering University of Bayreuth Bayreuth Germany

It is well known that miniaturized gas sensors can be obtained by coating a planar interdigital capacitor with a sensitive layer and exploiting the impedance changes induced by analyte incorporation. Commonly, one assumes that the sensor characteristics only depend on the sensitive layer but not on the substrate carrying the interdigital capacitor. However, in many cases, the sensor has to be exposed to higher temperatures. this is true, for instance, when hot exhaust gases are to be monitored or when the functional principle of the sensitive layer requires heating. A case in point are hydrocarbon sensors based on a zeolite layer in contact with a semiconducting metal-oxide such as Cr 2 O 3 . At operating temperatures of several hundred degrees centigrade, the substrate does influence the sensor impedance in a manner that can no longer be neglected. this contribution reports on the model-based interpretation of experimental results which allows one to draw conclusions on this substrate influence. the experiments were carried out with Si, glass, and quartz substrates at 300 degC and in various atmospheres. the current results bear relevance for the design and understanding of all planar interdigital-electrode sensors evaluated by impedance spectroscopy.

关键词： Gas detectors Substrates Temperature sensors Impedance Capacitors sensor phenomena and characterization Coatings Capacitive sensors Gases Monitoring

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distributed And Parallel Multisensor Fusion In the Wavelet Domain

Distributed And Parallel Multisensor Fusion In The Wavelet D...

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2009 ieee international conference on Intelligent computing and Intelligent systems(ICIS2009)

作者： Chen Shaodong the 613th Institute AVIC-1,471009 Luoyang,China Li Jianxun,Jiang Xingtong Department of Automation Shanghai Jiao Tong University Shanghai,China

By combining the wavelet domain filtering and multi-sensor linear information fusion rule,we propose a new distributed and parallel algorithm for multi-sensor information fusion using the theory of wavelet domain multi-scale *** proposed algorithm decomposes the single sensor's information into different scale,and then estimates the target state in different scale;then the local state estimates are transmitted to the fusion-center to get the optimal information fusion *** posterior Cramer-Rao lower bound (PCRLB of the proposed algorithm is also *** example of radar tracking system with three sensors is provided to illuminate the effectiveness of the method.

关键词： Wavelet domain Multi-sensor fusion distributed fusion Information fusion CRLB

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SoC Li-ion battery monitoring with impedance spectroscopy

SoC Li-ion battery monitoring with impedance spectroscopy

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ieee SSD international Multi-conference on systems, Signals and Devices

作者： A. Cuadras O. Kanoun Castelldefels School of Technology (EPSC) Electronics Engineering Department Universitat Politecnica de Catalunya Castelldefels Spain Chair for Measurement and Sensor Technology Chemnitz University of Technology Chemnitz Germany

the state of charge (SoC) of Li-ion coin batteries is investigated as a function of impedance variation. Batteries are submitted to highly stressed conditions to simulate the operation of active loads and impedance is measured in real time both for charge and discharge. In particular, modulus and phase dependence as a function of SoC is studied with impedance spectroscopy in the range 40 Hz to 20 kHz. Phase is found to be the most sensitive parameter. It decreases with battery discharge and increases with battery charge. Impedance is simply modelled with a 3 parameters circuit, two resistors and a constant phase element (CPE). Selected frequencies are then proposed to estimate the SoC of the battery.

关键词： Monitoring Electrochemical impedance spectroscopy Frequency estimation Current measurement Charge measurement Battery charge measurement Impedance measurement Stress measurement Circuits Resistors

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Adaptive electromagnetic energy harvesting circuit for wireless sensor application

Adaptive electromagnetic energy harvesting circuit for wirel...

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international conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology, ECTI-CON

作者： Torkiat Taithongchai Ekachai Leelarasmee Electrical Engineering Department Chulalongkom University Bangkok Thailand

this paper presents a microcontroller controlled electromagnetic energy harvesting system suitable for harvesting energy from a single HV transmission line with current between 65 A and 130 *** system comprises of magnetic power generator, standard voltage multiplier circuit, DC-DC boost converter and microcontroller. An adaptive algorithm has been applied to the microcontroller to adjust the duty cycle of the converter to achieve maximum output power. this enables the harvesting system to convert and store low voltage sinusoidal power induce from magnetic power generator into the battery for energizing various low power applications. the implemented system is able to operate with minimum sinusoidal induced voltage as low as IV and can generate 58 mW at 65 mA line current. Furthermore, simulation and experimental result as well as mathematical analysis are also included in this paper.

关键词： Wireless sensor networks Microcontrollers Power generation Low voltage Magnetic sensors Voltage control Control systems Power transmission lines distributed parameter circuits Magnetic circuits

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Trajectory enabled service support platform for mobile users' behavior pattern mining

Trajectory enabled service support platform for mobile users...

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international conference on Mobile and Ubiquitous systems: Networking and Services (MobiQuitous)

作者： Yanfeng Zhu Yibo Zhang Weixiong Shang Jin Zhou Chun Ying IBM China Research Laboratory China

Existing operational support systems of GSM service providers focus on collecting and maintaining massive rough cell-ID based location data, which cannot satisfy the requirement of new trajectory based services in identifying the behaviors of mobile users. In this paper, we introduce a trajectory enabled service support platform to convert the location data into limited meaningful mobile user's behavior patterns, which benefit the trajectory based services by simplifying the behavior detection. the core technologies of the platform are the pattern selection, which requires to cover the information included in the raw location data as more as possible, and the run-time mining algorithm, which requires less storage space. We propose a new concept, transient entropy, to identify the moving speed of users, and based on which we define and mine four types of behavior patterns: frequent locations, frequent trajectory, meaningful location, and moving mode. By analyzing the sojourn distribution, we find that the sojourn time in each location follows a Zipf distribution, based on which we present a run-time algorithm to mine the behavior patterns with less storage space. A realistic experiments is given to validate the proposed platform and algorithms.

关键词： Wireless sensor networks Monitoring Shape Fires Wireless communication distributed computing Medical services Discrete event simulation Microelectronics Communications technology

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Rod shape testing by high frequency eddy current -Passive impedance measurement-

Rod shape testing by high frequency eddy current -Passive im...

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ieee SSD international Multi-conference on systems, Signals and Devices

作者： Jens Weidenmuller Christian Sehestedt Olfa Kanoun Jorg Himmel Laboratory of Sensor Technology and Measurement Engineering University of Applied Sciences Koblenz Remagen Germany Fakultät für Elektro-und Informationstechnik Technische Universität Chemnitz-Zwickau Chemnitz Germany

For the rod shape measurement of hot rolled round steel bars (rods) the high frequency eddy current method is especially well suited as it requires no contact point and is not limited to below the Curie temperature. Defects of the rod's shape can be detected by measuring the impedance spectrum of the RLC-oscillator. In the first laboratory setup an Agilent impedance analyser was used for initial tests. Nevertheless, this setup cannot be applied in a steel plant due to the difficult environmental conditions. Hence, a vector network analyser for passive impedance measurement that is applicable in these surroundings was developed.

关键词： Shape measurement Eddy current testing Eddy currents Current measurement Impedance measurement Frequency measurement Steel Bars Temperature Laboratories

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