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Designing power-aware overlays in heterogeneous wireless sensor networks

Designing power-aware overlays in heterogeneous wireless sen...

引用

ieee international conference on sensor Networks, Ubiquitous, and Trustworthy computing

作者： Ou, Si-Yu Hsiao, Hung-Chang Chiang, Chi-Kuo King, Chung-Ta Natl Tsing Hua Univ Dept Comp Sci Hsinchu 300 Taiwan Natl Tsing Hua Univ Dept Comp Sci & Informat Engn Hsinchu 300 Taiwan

ISBN: (纸本)0769525539

As more and more innovative applications of wireless sensor networks emerge, the need for deploying heterogeneous sensors with different functionalities and capabilities rise rapidly. In this study, we consider a heterogeneous sensor network containing at least two types of sensors: powerful sensors and normal sensors. Powerful sensors have higher energy and computing capacities, and can communicate with normal senors using the same network interface. Communications between powerful sensors may thus be facilitated by building an overlay on top of the normal sensors. The topology of the overlay is critical. The overlay must have a low diameter to efficiently support upper layer applications such as resource discovery. It must also consider the energy consumption of the relaying normal sensors. In this paper, we propose a distributed overlay formation protocol to achieve the above goals. Through simulation, we compare our protocol with two overlay formation protocols, fully connected graph and minimum spanning tree. The results show that our proposed protocol can achieve better performance both in message latency and energy consumption.

关键词： Wireless telecommunication systems

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An attitude compensation technique for a MEMS motion sensor based digital writing instrument

An attitude compensation technique for a MEMS motion sensor ...

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ieee international conference of Nano/Micro Engineered and Molecular systems

作者： Luo, Yilun Tsang, Chi Chiu Zhang, Guanglie Dong, Zhuxin Shi, Guangyi Kwok, Sze Yin Li, Wen J. Leong, Philip H. W. Wong, Ming Yiu Chinese Univ Hong Kong Ctr Micro & Nano Syst Hong Kong Hong Kong Peoples R China Chinese Univ Hong Kong Dept Comp Sci & Engn Hong Kong Hong Kong Peoples R China DAKA Dev Ltd Kowloon Hong Kong Peoples R China

ISBN: (纸本)9781424401390

A MAG-mu IMU which is based on MEMS gyroscopes, accelerometers, and magnetometers is developed for real-time estimation of human hand motions. Appropriate filtering, transformation and sensor fusion techniques are combined in the Ubiquitous Digital Writing Instrument to record handwriting on any surface. In this paper, we discuss the design of an extended Kalman filter based on MAG-mu IMU (Micro Inertial Measurement Unit with Magnetometers) for real-time attitude tracking. The filter utilizes the gyroscope propagation for transient updates and correction by reference field sensors, such as gravity sensors, magnetometers or star trackers. A process model is derived to separate sensor bias and to minimize wideband noise. The attitude calculation is based on quaternion which, when compared to Euler angles, has no singularity problem. Testing with synthetic data and actual sensor data proved the filter will converge and accurately track the attitude of a rigid body. Our goal is to implement this algorithm for motion recognition of a 3D ubiquitous digital pen.

关键词： MEMS MAG-mu IMU human motion sensing extended kalman filter digital writing system wireless sensing

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Efficient and authenticated key agreement mechanism in low-rate WPAN environment

Efficient and authenticated key agreement mechanism in low-r...

引用

1st international Symposium on Wireless Pervasive computing

作者： Heo, Joon Hong, Choong Seon Kyung Hee Univ Dept Comp Engn 1 Seochun Gyeonggi 449701 South Korea

ISBN: (纸本)0780394100

Generally sensor network and wireless ad hoe network use a symmetric key agreement scheme, although this mechanism has some problems, such as key management, complex network deployment and configuration. This is because the devices of sensor network have limitations such as power, memory, processor speed and implementation cost. The public key algorithms are considered to be too expensive in term of memory and processing requirements. In Low-Rate Wireless Personal Area Network (WAN), we propose a new key agreement mechanism using the Security Manager (SM) for public key management based on the EC-MQV algorithm. And also, we define two security levels by means of device's power and security policies in the network. We have measured the performance of this mechanism and at the same time meeting the low implementation cost and low power.

关键词： Cryptography

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Carbon Nanotube-SnO₂ composite gas sensor prepared by electron beam evaporation

Carbon Nanotube-SnO<sub>2</sub> composite gas sensor prepare...

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ieee international conference of Nano/Micro Engineered and Molecular systems

作者： Wisitsoraat, A. Tuantranont, A. Thanachayanont, C. Singjai, P. Natl Elect & Comp Technol Ctr 112 Thailand Sci PkPahol Yothin Rd Klong Laung 12120 Pathumthani Thailand Natl Met & Mat Technol Ctr Pathum Thani Thailand Chiang Mai Univ Fac Sci Chiang Mai Thailand

ISBN: (纸本)9781424401390

Carbon nanotube (CNT) is a useful material for gassensing applications because of its high surface to volume ratio structure. In this work, multi-wall CNTs are incorporated into tin oxide thin film by the means of powder mixing and electron beam evaporation and the enhancement of gas-sensing properties is presented. The CNTs were combined with SnO2 powder with varying concentration in the range of 0.25-5% by weight and electron beam evaporated onto glass substrates. From AFM and TEM characterization, CNT inclusion in SnO2 thin film results in the production of circular cone protrusions of CNT clusters or single tube coated with SnO2 layer. Experimental results indicate that the sensitivity to ethanol of SnO2 thin film increases by the factors of 3-6. However, if the CNT concentration is too high, the sensitivity is decreased. Moreover, the CNT doped film can operate with good sensitivity and stability at a relatively low temperature of 250300 degrees C. The improved gas-sensing properties should The attributed to the increasing of metal oxide surface adsorption area produced by CNT protrusion.

关键词： Evaporation

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Fully pre-splicing TCP for web switches

Fully pre-splicing TCP for web switches

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

作者： Chang, Yeim-Kuan Cheng, Wen-Hsin Young, Chung-Ping Natl Cheng Kung Univ Dept Comp Sci & Informat Engn Tainan 70101 Taiwan

ISBN: (纸本)0769526160

Fully pre-splicing (FPS) is an extension of TCP splicing which is content-blind that prevents the switches from using application layer information for forwarding decisions. FPS extends TCP splicing to support content-aware load balancing algorithms and pre-splices the client's connections to web servers. In addition, FPS extracts the application-information in kernel-space for eliminating the cost of moving data twice through user/kernel protection boundaries and the latency of scheduling the processes. To achieve our design, we extended the TCPSP project of LVS using Linux Netfilter which defines specific hooks to provide a verdict for the packet. On the performance results, FPS improves the TCPSP throughput dramatically.

关键词： fully pre-splicing FPS TCP splicing TCP handoff layer-7 web switch content switch pre-fork connection distributed web server

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A genetic algorithm on multi-sensor networks lifetime optimization

A genetic algorithm on multi-sensor networks lifetime optimi...

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1st international conference on Wireless Algorithms, systems and Applications

作者： Pan, Yantao Peng, Wei Lu, Xicheng Natl Univ Def Technol Sch Comp Changsha Peoples R China

ISBN: (纸本)3540371893

Since data communications consume the most energy of sensor networks, it is reasonable to take efficient traffic balancing to prolong the lifetime. In addition, the traffic aggregation is a main characteristic that distinguish sensor networks from others e.g. Internet and MANET. Therefore, an optimal traffic distribution will maximize the network lifetime. Furthermore, sensor networks are generally developed for special applications. If different sensor networks deployed in the same region can cooperate with each other in data transmission, their lifetimes can be improved remarkably. In this paper, we propose a genetic algorithm to achieve optimal traffic distribution on multi-sensor networks and show its efficiency by experiments.

关键词： sensor networks lifetime optimization and genetic algorithm

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An analytical traffic flow model for cluster-based wireless sensor networks

An analytical traffic flow model for cluster-based wireless ...

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1st international Symposium on Wireless Pervasive computing

作者： Tang, Shensheng Univ Toledo Dept Elect Engn & Comp Sci Toledo OH 43606 USA

ISBN: (纸本)0780394100

An analytical traffic flow model is developed for cluster-based wireless sensor networks. The source-to-sink path is modeled by a number of single-server finite queues linked in tandem. During the process of modeling, both the blocking effect of tandem queuing networks and the impact of connection failure due to limited node power are taken into account. The tandem queuing network is analyzed by decomposing it into individual nodes with modified arrival and service processes and modified queue capacities. The steady-state queue-length distributions of individual nodes are determined iteratively by using the matrix-geometric procedure. A computational algorithm with a global loop from the last node to the first node and local loops in individual nodes is developed to determine the performance metrics, such as source-to-sink throughput (Sst) and source-to-sink delay (SSD), of the tandem network.

关键词： wireless sensor network (WSN) clustering source-to-sink throughput (Sst) source-to-sink delay (SSD) Quality of service (QoS)

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Wireless sensor based dynamic channel selection in cellular communication by cognitive radio approach

Wireless sensor based dynamic channel selection in cellular ...

引用

1st international conference on Cognitive Radio Oriented Wireless Networks and Communications

作者： Banerjee, Torsha Ghosh, Chittabrata Agrawal, Dharma P. Univ Cincinnati OBR Ctr Distributed & Mobile Comp Cincinnati OH 45221 USA

ISBN: (纸本)9781424403806

In a cellular communication scenario, wireless sensors can be deployed to sense the interference power of the frequency band. In an ideal channel, interference temperature (IT) which is directly proportional to the interference power can be assumed to vary spatially with. the frequency of the sub channel, We propose a scheme for approximating ITs over an extended C-band (licensed and unused television band) by fitting sub channel frequencies and corresponding ITs to a regression model. Using this model, IT of a random sub channel can be calculated by the base station (BS) for further analysis of the channel interference. Our proposed model based on readings reported by sensors helps in Dynamic Channel Selection (S-DCS) in extended C-band for assignment to unlicensed secondary users. S-DCS maximizes channel utilization and proves to be economic from energy consumption point of view. It also exhibits substantial amount of accuracy with error bound within 6.8%. Again, users are assigned empty, sub channels without actually probing them, incurring minimum delay in the process. Overall channel allocation efficiency is also maximized along with fairness to individual users.

关键词： channel allocation cognitive radio interference temperature regression WFQ

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A Bulk Micromachined distributed Digital Microwave Phase Shifter with Butterfly Multilayer Bridges and MAM Capacitors

A Bulk Micromachined Distributed Digital Microwave Phase Shi...

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ieee international conference of Nano/Micro Engineered and Molecular systems

作者： Miao, Min Wu, Guoying Li, Zhihong Jin, Yufeng Hao, Yiong Peking Univ Inst Microelect Natl Key Lab Nano Micro Fabricat Technol Beijing 100871 Peoples R China Beijing informat Technol Inst Dept Informat & Telcom Engn Beijing Peoples R China

ISBN: (纸本)9781424401390

This paper reports a bulk Si micromachined distributed digital microwave phase shifter with butterfly-like loading microbridges. Having a multilayer structure, the bridges use heavily boron-doped single crystal silicon (SCS) as the skeleton layer, so that the excellent mechanical property of SCS can be utilized to ensure the performance and reliability of the device. The fabrication is shown to be much simpler than surface micromachining which have been widely used by MEMS phase shifters ever reported. A finite-element-method full-wave simulation, was made for the microwave performance validation of this device, the application of which in phase shifter microwave performance analysis has not been reported as far as the authors know. Since Si is used as the skeleton of the bridges, thermal mismatch between all-metal bridge and dielectric substrate is avoided, and reliability at high temperature is guaranteed. Besides, the biasing network is simple to implement and no DC blocking capacitors are needed to realize a multi-bit device. The microwave test results show that a 180 degrees I-bit phase shift has been realized with return loss < 10dB and true time delay performance.

关键词： bulk micromachining phase shifter radio frequency micro electromechanical system (RF MEMS) microbridge metal-air-metal (MAM) capacitor

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Mobile semantic data exchange in ad hoc networks using distributed profiles

Mobile semantic data exchange in ad hoc networks using distr...

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1st international Symposium on Wireless Pervasive computing

作者： Baumgart, Andre stephan Knapp, Hartwig Schader, Martin Univ Mannheim Automat Lab D-6800 Mannheim 1 Germany Univ Mannheim Dept Informat syst 3 Mannheim Germany

ISBN: (纸本)0780394100

Collecting relevant information from a heterogeneous set of data resources is a challenging problem. Moreover, the storage and search for semantic data is even more complex in mobile environments. In this paper we present an approach how to collect semantic information by underlying profile settings. We define several profile types and levels where the user's interests are stored. Information retrieval is then executed according to the profile settings. distributed profiles for mobile semantic data exchange can personalize the exchanged information in business settings. This leads to effective data transmission with regard to the mobile (device) context and the business environment, the user is exposed to. Our realization of a prototype confirms the effective semantic data exchange. The evaluation of dynamic profile settings in ad hoc network scenarios verifies our approach experimentally.

关键词： Data transfer

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