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A genetic algorithm on multi-sensor networks lifetime optimization

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

引用

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

A Bulk Micromachined Distributed Digital Microwave Phase Shi...

引用

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

Wireless sensor based dynamic channel selection in cellular ...

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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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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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GIst: Group-independent spanning tree for data aggregation in dense sensor networks

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2nd ieee international conference on distributed computing in sensor systems

作者： Jia, Lujun Noubir, Guevara Rajaraman, Rajmohan Sundaram, Ravi Northeastern Univ Coll Comp & Informat Sci Boston MA 02115 USA

ISBN: (纸本)3540352279

Today, there exist many algorithms and protocols for constructing agregation or dissemination trees for wireless sensor networks that are optimal (for different notions of optimal, i.e. under different cost metrics). However, all these schemes differ from one common failing - they construct an optimal tree for a given fixed subset of the sensors. In most practical scenarios, the sensor group is continuously and dynamically varying - consider for example the set of sensors scattered in a forest that are sensing temperatures above some specified threshold, during a wildfire. Given the limited computational and energy resources of sensor nodes it is impossible to either prestore the optimal tree for every conceivable group or to dynamically generate them on the fly. In this paper we propose the novel approach of constructing a single group-independent spanning tree (GIst) T for the network and then letting any sensor group S use the subtree induced by S on T, T_S as its group aggregation tree. The important question is, how does the quality of the subtree T_S compare to the optimal tree, OPTs, across different groups S. We consider two well-accepted measures - aggregation cost (sum over all links) and delay (diameter). We show that in polynomial time we can construct a GIst that simultaneously achieves O(log n)-approximate aggregation cost and O(1)-approximate delay, for all groups S. To the best of our knowledge GIst is the first construction with a nontrivial and provable performance guarantee that works for all groups. We provide a practical and distributed protocol for realizing GIst that requires only local knowledge. We show an Ω(n) lower bound for commonly accepted solutions such as Mst and SPT (i.e. there exists a group for which the induced subtree performs poorly) and demonstrate by simulation that GIst is good not just in the worst case - it outperforms SPT and Mst by between 30 and 60 per cent in realistic random scenarios. GIst is an ov

关键词： Wireless telecommunication systems

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Ultra-low-power alcohol vapor sensors based on multi-walled carbon nanotube

Ultra-low-power alcohol vapor sensors based on multi-walled ...

引用

ieee international conference of Nano/Micro Engineered and Molecular systems

作者： Sin, Mandy L. Y. Chow, Gary C. T. Fung, Carmen K. M. Li, Wen J. Leong, Philip Wong, K. W. Lee, Terry Chinese Univ Hong Kong Ctr Micro & Nano Syst Hong Kong Hong Kong Peoples R China Chinese Univ Hong Kong Dept Phys Hong Kong Hong Kong Peoples R China Automat MFG Ltd Hong Kong Hong Kong Peoples R China

ISBN: (纸本)9781424401390

We have demonstrated multi-walled carbon nanotube (MWCNTs) based sensors, which are capable of detecting alcohol vapor with ultra-low power. We fabricated the Si-substrate sensors using an AC electrophoretic technique so as to form bundled MWCNTs sensing elements between An microelectrodes. The I-V measurement illustrates that we can activate the sensors at the Ohmic region of the sensors (at 10 mu A), which is without any overheat effect. The sensors only need an ultra-low power (similar to 1 mu W) to detect the alcohol vapor. They exhibit fast, reversible and repeatable response. We have tested the response of the sensors with alcohol concentrations from 10ppth to 400ppth (ppth = parts per thousand). Our result shows that there is a linear relation between the resistance of the sensors and alcohol concentration. Also, we can easily reverse the sensor to the initial reference resistance by annealing them at 100-250 mu A current within 6 minutes. Moreover, the sensors are selective with respect to flow from air, water vapor, and alcohol vapor. Finally, we have also studied how the temperature of the sensors affects their response towards alcohol vapor. The result shows that the performance of the sensors will deteriorate as the temperature of the sensors increase. Also, the cooling effect of the vapor is not a dominating factor in determining the response of the sensor. Based on our experiments, we prove the feasibility of turning the MWCNTs sensors into a commercialized alcohol sensor with ultra-low power requirements.

关键词： carbon nanotubes alcohol sensor ultra-low-power

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Reconfigurable interconnection networks in distributed Shared Memory systems: a study on communication patterns

Reconfigurable interconnection networks in Distributed Share...

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1st international conference on Communications and Electronics (ICCE 2006)

作者： Khoi, Bui Viet Tinh, Pham Doan Quan, Nguyen Nam Artudo, Inigo Manjarres, Daniel Heirman, Wim Debaes, Christof Dambre, Joni Van Campenhout, Jan Thienpont, Hugo Hanoi Univ Technol Dept Elect & Informat Hanoi Vietnam Vrije Univ Brussel Dept Appl Phys & Photon Brussels Belgium Univ Ghent Elect & Informat Syst Dept Ghent Belgium

ISBN: (纸本)9781424405688

The static interconnection network topologies in the distributed shared memory systems (DSM) have several limitations. The reconfigurable interconnection networks may reduce the network congestion, network latency and improve the overall performance. However it is necessary to know when the right moment to perform the reconfiguration is and how to implement it. In this paper, we present our study on communication patterns of parallel scientific and commercial benchmark applications on a simulated but realistic DSM machine and their relation to context switching in the operating system. We also propose a reconfiguration scheme that is triggered by the context switches.

关键词： reconfiguration imerconnection network distributed shared ntemoiy multiprocessors context switch

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Supporting heterogeneous traffic in wireless sensor networks

Supporting heterogeneous traffic in wireless sensor networks

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1st international Symposium on Wireless Pervasive computing

作者： Poonvasin, Sirivat Pathommanit, Nartiemon Kasetsart Univ Fac Engn Dept Elect Engn Bangkok Thailand

ISBN: (纸本)0780394100

We consider an energy-aware packet transmission node that supports packets of two types: real-time packets and non real-time packets. Several energy-aware packet scheduling schemes are explored and discussed. Using the average delay of non real-time packets and the rejection rate of real-time packets as performance metrics, a scheduling scheme for this purpose is proposed. It is composed of two scheduling stages. In the early stage, each packet type is scheduled independently on the per type basis. They are then merged using PGPS into the second stage where the transmission speed for each packet is assigned. The packets are then transmitted using Dynamic Modulation Scaling (DMS). The method has been evaluated using simulation and compared against one in which energy savings schemes are not incorporated. The result shows that not only does it provide a fair share of bandwidth (low rejected packets for real-time packets and low delay for non real-time packets) between these streams' but it also saves the overall transmission energy, particularly in the light load case, where as much as 90% savings can be obtained.

关键词： Wireless telecommunication systems

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A suitable control strategy for source converters and a novel load-generation voltage control scheme for DC voltage determination in DC distribution systems

A suitable control strategy for source converters and a nove...

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1st international Power and Energy conference (PECon 2006)

作者： Mahmoodi, M. Gharehpetian, G. B. Abedi, M. Noroozian, R. Amirkabir Univ Technol Dept Elect Engn Tehran Iran

ISBN: (纸本)9781424402731

The power flow control in DC distribution systems is achieved by source converters which have DC voltage controllers. This paper proposes a suitable control strategy for source converters which has a DC voltage droop controller and a novel instantaneous power regulation scheme. Furthermore, this paper develops a simple method, named Load-Generation Voltage Control (LGVC) scheme, which can be used for DC system voltage determination. Simulation results indicate the effectiveness of the proposed control strategy for source converters and the LGVC scheme.

关键词： DC distribution system distributed Generation droop control source converter

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