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An energy-aware protocol for periodical data collection in wireless sensor networks

An energy-aware protocol for periodical data collection in w...

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1st ieee international conference on Wireless Broadband and Ultra Wideband Communications, AusWireless 2006

作者： Tabassum, Nahdia Mamun, Quazi Ehsanul Kabir Urano, Yoshiyori GITS Waseda University Japan

ISBN: (纸本)0977520005

In this paper we propose a protocol for periodical data collection applications in wireless sensor networks. The protocol is energy-aware in the sense that the way of energy consumption used here is evenly distributed. The protocol is chain-oriented and uses data fusion at every sensor node. Compare to other data collection protocols, this protocol shows better performance with respect to both latency and energy. It has been found that the proposed protocol outperforms PEGASIS with respect to latency in data delivery and performs better than that of LEACH with respect to energy. Furthermore, our protocol performs higher number rounds than that of PEGASIS in the case when the first node dies in the network. In a word the protocol shows an outstanding time-energy compromise.

关键词： Energy utilization

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Asymmetric multihop communication in large sensor networks

Asymmetric multihop communication in large sensor networks

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1st international Symposium on Wireless Pervasive computing

作者： Neander, Jonas Hansen, Ewa Nolin, Mikael Bjorkman, Mats Malardalen Univ Malardalen Realtime Res Ctr Vasteras Sweden

ISBN: (纸本)0780394100

With the growing interest in wireless sensor networks, energy efficient communication infrastructures for such networks are becoming increasingly important. In this paper, we compare and simulate asymmetric and symmetric communication in sensor networks. We do this by extending LEACH, a well-known TDMA cluster-based sensor network architecture, to use asymmetric communication. The extension makes it possible to scale up the network size beyond what is feasible with LEACH and its variants LEACH-C and LEACH-F.

关键词： Telecommunication networks

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Key management in sensor networks

Key management in sensor networks

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1st international conference on Wireless Algorithms, systems and Applications

作者： Li, Guorui He, Jingsha Fu, Yingfang Beijing Polytech Univ Coll Comp Sci & Technol Beijing 100022 Peoples R China Beijing Polytech Univ Sch Software Engn Beijing 100022 Peoples R China

ISBN: (纸本)3540371893

sensor networks are widely used in a variety of commercial and military applications due to their self-organization characteristics and distributed nature. As a basic requirement for supporting security in sensor networks, key management plays an essential role in authentication and encryption. In this paper, we describe the hexagon-based key predistribution scheme and show that it can improve the effectiveness of key management in sensor networks. We show that this key management scheme can improve the probability of establishing pairwise keys between sensor nodes of up to two hops apart by more than 40% over other schemes. We also show that the security of a sensor network would decrease with the increase in sensor node deployment density or in signal propagation distance.

关键词： sensor networks security key management

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Balancing image quality and energy consumption in visual sensor networks

Balancing image quality and energy consumption in visual sen...

引用

1st international Symposium on Wireless Pervasive computing

作者： Chow, Kit-Yee Lui, King-Shan Lam, Edmund Y. Univ Hong Kong Dept Elect & Elect Engn Hong Kong Hong Kong Peoples R China

ISBN: (纸本)0780394100

Applications of wireless sensor networks have attracted a lot of attention recently. Cameras are installed in various locations of a wide area to capture images of targeted objects. Because of constraints in computational capability in these distributed cameras, it may not be feasible to analyze these images in the sensors but they have to be transmitted to a centralized server hop by hop through the sensor network. To reduce the energy used in transmission, the size of the images should be kept small by applying a large compression ratio, which may degrade image quality. This paper studies the tradeoff between image quality and energy consumption. We study the scenario that a number of camera-equipped sensors are taking pictures of the same object, and the pictures of adjacent cameras may overlap. We demonstrate that by allowing intermediate sensors to process the images and combine the overlapping portions, the total energy spent on transmission is reduced subject to a certain degradation in image quality. The tradeoff between image quality and energy consumption of different routing presents an important study on the practicability of visual sensor networks.

关键词： Visual communication

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A coverage algorithm in 3D Wireless sensor Networks

A coverage algorithm in 3D Wireless Sensor Networks

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1st international Symposium on Wireless Pervasive computing

作者： Watfa, Mohamed K. Commuri, Sesh Univ Oklahoma Dept Elect & Comp Engn Norman OK 73019 USA

ISBN: (纸本)0780394100

Wireless sensor Networks (WSNs) made zip of many small sensing devices equipped with memory, processors, and short-range wireless communication will provide an unprecedented amount of detailed measurements over wide geographic areas. Communication between nodes requires the expenditure of energy, a scarce commodity in most WSNs. Thus, making effective use of data will require scalable, self organizing, and energy-efficient data dissemination algorithms. In this paper, contrary to existing techniques, the coverage problem in a three dimensional space is analyzed. The "coverage hole" problem is also analyzed and a substitute plan is proposed where sensor nodes that are almost out Of energy or already dead, are substituted by nodes that will cover their sensing region and have more energy supply.

关键词： Wireless telecommunication systems

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Ultra-low power WSN node with integrated THP sensor

Ultra-low power WSN node with integrated THP sensor

引用

ieee international conference of Nano/Micro Engineered and Molecular systems

作者： Fang, Zhen Zhao, Zhan Zeng, Huanhuan Wang, Qi Dong, Haifeng Guo, Peng Zhang, Yuguo Chinese Acad Sci Inst Elect State Key Lab Transducer Technol Beijing 100864 Peoples R China Chinese Acad Sci Grad Univ Beijing 100864 Peoples R China

ISBN: (纸本)9781424401390

MIEMS-based integrated temperature, humidity and pressure (THP) sensor has the advantages of small size, low cost, easy integration and is a highly advanced apparatus of identity, reliability and easy production. The principle and structure of the integrated THP sensor are analyzed in this paper in short, and it also provides the measuring methods and circuits in detail. The outcome of measurement verifies excellent performance of the integrated THP sensor. Based on the MIEMS-based integrated (THP) sensor and relevant measurement circuit, an ultra low power consumption wireless sensor network node for environment monitoring was designed. The design consists of three major goals to enable experimentation: minimal power consumption, easy to use, and enhanced software and hardware robustness. What hardware components were selected and how integrated in order to achieve these goals is discussed in this paper. Using Silicon C8051F121 microcontroller, Chipcon ieee 802.15.4-compliant radio CC2420 or CC1020, USB, RTC, the module power consumption is less than current platforms while providing better performance and greater throughput.

关键词： THP sensor WSN node utra-low power

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Application of intelligent flexible skin sensors for interfacing with robotic pets

Application of intelligent flexible skin sensors for interfa...

引用

ieee international conference of Nano/Micro Engineered and Molecular systems

作者： Sun, Lei Shan, Han Hua Meng, Max Q. -H. Zhang, Dongfeng Mei, Tao Chinese Acad Sci Inst Machine Intelligence Ctr Biomimet Sensing & Control Res Hefei 230031 Peoples R China Chinese Acad Sci Inst Intelligent Machines Hefei 230031 Peoples R China Univ Sci & Technol China Hefei 230021 Peoples R China

ISBN: (纸本)9781424401390

This paper describes the application of intelligent flexible skin sensors for interfacing with robotic pets. The new flexible sensor system includes a skin sensor and a fuzzy unit. The skin sensor is fabricated using MEMS technique and can be used to measure normal and shear forces, on curved surfaces due to the flexible structure design of the sensor array. Using these features, the flexible skin sensors are used to cover sensing surfaces of a robotic pet. The fuzzy unit receives the outputs of the sensors and then determines the touching force information applied to the robotic pet. The robotic pet can then recognize the moods, intentions and behaviours of the human host based on the sensed touching force information so as to react to the human host with preprogrammed responses. Analysis and experiments demonstrate that the flexible skin sensor system can serve as an effective interface between robotic pet and their human hosts.

关键词： skin sensor fuzzy neural network robotic pet

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Finite element method design and fabrication of thermo-sensitive quartz tuning fork resonators as temperature sensor

Finite element method design and fabrication of thermo-sensi...

引用

ieee international conference of Nano/Micro Engineered and Molecular systems

作者： Xu, Jun You, Bo Harbin Univ Sci & Technol Sch Automat Harbin Peoples R China

ISBN: (纸本)9781424401390

Piezoelectric resonators have widely been utilized not only for time keeping devices but also for temperature measurement sensors. In order to obtain a temperature sensor having low power consumption, low cost, fast response, high sensitivity and high precision, resonance frequency of quartz tuning fork crystal for use in temperature sensor was analyzed by the finite element method (FEM). FEM was used to model optimum tuning fork geometry, tine tip and tine surface electrode shape and thickness with a resonance frequency close to 40 kHz as design targets. This type of sensor was designed with a new ZYtw-cut was proved that working at flexural vibration mode was better than at the others. The fabrication of resonators was realized by employing photolithography and chemical etching. Moreover tuning fork resonators were further processed for packaged in holders and filled with helium 90 Pa and thus fabricated were evaluated by measuring resonance frequency. The results of the experiment show that it is possible to construct a miniature and an excellent quartz tuning-fork temperature sensor.

关键词： keywords-quartz crystal piezoeleciticresontors temperature sensor finite element method etching

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Cost-based solution for optimizing multi-join queries over distributed streaming sensor data

Cost-based solution for optimizing multi-join queries over d...

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international conference on Collaborative computing

作者： Gomes, Joseph Choi, Hyeong-Ah George Washington Univ Dept Comp Sci Washington DC 20052 USA

ISBN: (纸本)9781424404285

sensors are envisioned to be at the center of distributed collaborative computing services involving time-critical decision support. sensors are small devices with limited communication and computational capabilities that collect data on their neighboring physical world and send the data periodically to server machines. sensors form a collaborative network with these servers, where the sensors gather information and the servers perform various operations (e.g. filter, aggregate, join etc) on the information streams in real-time according to predefined queries or rules. sensor data streams are continuous, un-ending and have highly volatile characteristics. As a result, traditional database systems are inappropriate for handling queries for sensor streams, and several stream data management systems have been proposed in the literature. In this paper we focus on a special type of query, namely join queries, which is the most expensive query operator. Here, we address the problem of finding an optimal join tree that maximizes throughput for sliding window based multi-join queries over continuous sensor data streams. We present a polynomial time algorithm Fodp and three variants of Fodp. Our experiments in ARES(1). show that for almost all instances, trees from Fodp and its variants perform close to the optimal trees from our exponential time algorithm OptDP [1], and significantly better than existing XJoin based heuristic algorithms.

关键词： distributed sensors groupware query processing sensor fusion distributed streaming sensor data exponential time algorithm multijoin queries optimal join tree polynomial time algorithm sliding window

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Adaptive scheduler to improve QoS in ieee 802.11e wireless LANs

Adaptive scheduler to improve QoS in IEEE 802.11e wireless L...

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1st international conference on Innovative computing, Information and Control (ICICIC 2006)

作者： Zhu, Rongbo Yang, Yuhang Shanghai Jiao Tong Univ Dept Elect Engn Shanghai Peoples R China Wuhan Univ Technol Sch Automat Wuhan 430070 Peoples R China

ISBN: (纸本)0769526160

An effective scheduler is proposed to improve the performance of ieee 802.11e wireless local area networks (LANs), which adaptively adjusts the ratio of enhanced distributed channel access (EDCA) duration to controlled access phase (CAP) duration by tracking the amounts of variable bit rate (VBR) and constant bit rate (CBR) traffics in a real-time manner. Simulation results. show that the proposed scheme significantly improves quality of service (QoS) in terms of throughput and delay metrics.

关键词： Quality of service

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