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distributed Multiversion Optimistic Concurrency Control for Mobile Real-Time Database systems

Distributed Multiversion Optimistic Concurrency Control for ...

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3rd international conference on Wireless Communications, Networking and Mobile computing (WiCOM 2007)

作者： Lei Xiangdong Zhao Yuelong Chen Songqiao Yuan Xiaoli Cent S Univ Coll Informat Sci & Engn Changsha 410083 Hunan Peoples R China

ISBN: (纸本)9781424413119

In this paper DMVOCC-MDA-2PLV protocol is proposed for processing mobile distributed real-time transaction in mobile broadcast environments. The new protocol can eliminate conflicts between mobile read-only and mobile update transactions, and resolve data conflicts flexibly using multiversion dynamic adjustment of serialization order to avoid unnecessary restarts of transactions. Mobile read-only transactions can be committed with no-blocking. Respond time of mobile read-only transactions is greatly improved. The tolerance of mobile transactions of disconnections from the broadcast channel is increased. The simulation results show that the new concurrency control protocol proposed offers better performance than other protocols.

关键词： mobile distributed real-time database systems muliversion optimistic concurrency control multiversion dynamic adjustment local pre-validation multiversion data broadcast

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Localization for anchoritic sensor networks

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3rd ieee international conference on distributed computing in sensor systems

作者： Baryshnikov, Yuliy Tan, Jian Bell Labs 600 Mt Ave Murray Hill NJ 07974 USA Columbia Univ Dept Elect Engn New York NY USA

ISBN: (纸本)9783540730897

WE! introduce a class of anchoritic sensor networks, where communications between sensor nodes are undesirable or infeasible due PF to, e.g., harsh environments, energy constraints, or security considerations. Instead, we assume that the sensors buffer the measurements over the lifetime and report them directly to a sink without necessarily requiring communications. Upon retrieval of the reports, all sensor data measurements will be available to a central entity for post processing. Our algorithm is based on the further assumption that some of the data fields that are being observed by the sensors can be modeled as a local (i.e. having decaying spatial correlations) stochastic process;if not, then choose an auxiliary field, e.g., carefully engineered random signals intentionally generated by arranged devices, "cloud shadows" cast on the ground, or animal heat. The sensor nodes record the measurements, or a function of the measurements, e.g., "1" when the measured signal is above a threshold, and "0" otherwise. These time-stamped sequences are ultimately transferred to the sink. The localization problem is then approached by analyzing the correlations between these sequences at pairs of nodes. As for applications, we discuss the localization scheme for large-scaled sensor networks deployed on the seabed and study a two-tiered architecture that organizes deaf sensors with local masters.

关键词： sensor nodes

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LIMOS: a Lightweight Multi-threading Operating System dedicated to Wireless sensor Networks

LIMOS: a Lightweight Multi-threading Operating System dedica...

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3rd international conference on Wireless Communications, Networking and Mobile computing (WiCOM 2007)

作者： Zhou, Hai-ying Hou, Kun-mean Harbin Inst Technol Sch Comp Sci & Technol Harbin 150006 Peoples R China Univ Blaise Pascal CNRS Clermont Ferrand II UMR 6158LIMOS Lab Clermont Ferrand France

ISBN: (纸本)9781424413119

The operating systems of Wireless sensor networks should he suitable for strict-constrained system resources and support two operation modes: event-driven & multi-threading. Traditional embedded operating systems are generally not fit for WSN applications. This paper presents a smart, resource-aware, low-power-consuming and distributed real-time micro-kernel: LIMOS. LIMOS adopts an event & thread two-level system architecture and a two-level scheduling policy: 'non pre-emption priority based' high level scheduling for events;and 'preemptive priority-based' low level scheduling for threads. The scheduling scheme is predictable and deterministic with respect to real-time applications. A unique system interface and a system primitive-pair, i.e. tuple and IN & OUT, are proposed for all kinds of system synchronization and communication. LIMOS integrates the advantages of tinyOS and SDREAM. It allows running in different modes. The combination of two kernels extends greatly the application range of LIMOS from simple single-task to multitask applications. In present, LIMOS has been evaluated on several hardware platforms and ported for different applications.

关键词： WSN tinyOS LIMOS LINDA

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An effective quality control of textual information on the basis of statistical redundancy in distributed mobile IT systems and e-applications

An effective quality control of textual information on the b...

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3rd ieee/IFIP international conference in Central Asia on Internet, ICI 2007

作者： Jumanov, I.I. Akhatov, O.I. Djumanov Samarkand State University Department of Information Technologies 15 Universitet hiyoboni str. 703004 Samarkand Uzbekistan

ISBN: (纸本)1424410061

The architecture of uniform information space of Republic of Uzbekistan by a hierarchical principle on the basis distributed mobile IT systems is stated. For the information space of regional management which is formed as set of the distributed databases and knowledge, storehouses of the information, computing centers, managing systems, and also applied Internet-portals and systems for representation of modern e-services the task of providing of reliability of inputting, transfer and processing of the information of a various nature and format is put and solved at a level of the users of network services of an applied level (Applied, Presentation, Session levels of OSI model). The algorithms based on principles of statistical and dictionary coding are developed for the control of the information reliability at the expense of statistical redundancy. There are used the schemes of coding by methods of Huffman, Lempel-Ziv-Welch, transformation of Burrows-Wheeler and arithmetical coding. ©2007 ieee.

关键词： OSI model

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Reliability Guaranteed Data Transmission With Adaptive Multi-Coverage in sensor Networks

Reliability Guaranteed Data Transmission With Adaptive Multi...

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3rd international conference on Wireless Communications, Networking and Mobile computing (WiCOM 2007)

作者： Liu, Wei Luo, Hong Beijing Univ Posts & Telecommun Sch Comp Sci & Technol Beijing Key Lab Intelligent Telecommun Software & Beijing 100088 Peoples R China

ISBN: (纸本)9781424413119

Reliability guaranteed data transmission with energy efficiency is one of the major challenges in wireless sensor networks (WSNs) in the presence of unreliable or lossy wireless link. In this paper, we propose a protocol called RTAM which could deliver packets at the desired reliability with low transmission cost by employing adaptive multi-coverage strategy. sensors are deployed either randomly or evenly distributed to K-cover the monitored region, such that any point or sub area information could be sensed and delivered by multiple sensors and the network guarantees the desired reliability. Furthermore, in order to control the overhead of the reliable transmission, we introduce two algorithms ORS and CRS in RTAM, which ensure sensors automatically join to detection and reporting according to the desired reliability and local knowledge. Thus, RTAM can jointly optimize both information reliability and energy efficiency in sensor networks.

关键词： wireless sensor networks reliability routing multi-coverage

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SNTS: sensor network troubleshooting suite

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3rd ieee international conference on distributed computing in sensor systems

作者： Khan, Mohammad Maifi Hasan Luo, Liqian Huang, Chengdu Abdelzaher, Tarek Univ Illinois Dept Comp Sci 1304 W Springfield Ave Urbana IL 61801 USA

ISBN: (纸本)9783540730897

sensor network troubleshooting is a notoriously difficult task, further exacerbated by resource constraints, unreliable components, unpredictable natural phenomena, and experimental programming paradigms. This paper presents SNTS (sensor Network Troubleshooting Suite), a tool that performs automated failure diagnosis in sensor networks. SNTS can be used to monitor network conditions using simple visualization techniques as well as to troubleshoot deployed distributed sensor systems using data mining approaches. It is composed of (i) a data collection front-end that records events internal to the network and (ii) a data processing back-end for subsequent analysis. We use data mining techniques to automate failure diagnosis on the back-end. The assumption is that the occurrence of execution conditions that cause failures (e.g., traversal of an execution path that contains a "bug" or occurrence of a sequence of events that a protocol was not designed to handle) will have a measurable correlation (by causality) with the resulting failure itself. Hence, by mining for network conditions that correlate with failure states the root causes of failure are revealed with high probability. To evaluate the effectiveness of the tool, we have used it to troubleshoot a tracking system called EnviroTrack [4], which, although performs well most of the time, occasionally fails to track targets correctly. Results show that SNTS can identify the major causes of the problem and give developers useful hints on improving the performance of the tracking system.

关键词： sensor network data mining distributed troubleshooting

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Game Theoretical Computation based Energy Efficient Routing for Wireless sensor Networks 3

Game Theoretical Computation based Energy Efficient Routing ...

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3rd international conference on Eco-Friendly computing and Communication systems (ICECCS)

作者： Pitchai, K. Mohaideen Paramasivan, B. Bhuvaneswari, M. Natl Engn Coll Dept Comp Sci & Engn Kovilpatti Tamil Nadu India

ISBN: (纸本)9781479970025

The paper aims to provide an energy efficient routing algorithm for Wireless sensor Networks (WSNs). Clustering is a technique widely adopted in WSNs. It divides the network into clusters and the cluster heads are responsible for forwarding the aggregated data to the sink. There are many algorithms for forwarding the data to the sink. In this paper, a Game theory based Energy efficient Routing Algorithm (GERA) is proposed. As a clustering algorithm GERA adopts game theory and set a utility function based on the benefit and energy consumption of the node. Cluster heads are selected based on the utility function of the node iteratively. The cluster formation is done based on the cost function of the node in the network. Also an intra-cluster and multi-hop inter-cluster routing algorithms are designed and the simulation results shows that cluster heads are evenly distributed. The proposed routing algorithm consumes less energy than other existing algorithms such as Low Energy Adaptive Clustering Hierarchy (LEACH) and Density-based Energy-efficient Game-theoretic Routing Algorithm (DEGRA). Also the network lifetime is largely prolonged.

关键词： Energy efficiency game theory routing utility function wireless sensor networks

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Optimal cluster association in two-tiered wireless sensor networks

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3rd ieee international conference on distributed computing in sensor systems

作者： Wang, WeiZhao Song, Wen-Zhan Li, Xiang-Yang Moaveni-Nejad, Kousha Google Inc Mountain View CA 94043 USA

ISBN: (纸本)9783540730897

In this paper, we study the two-tiered wireless sensor network (WSN) architecture and propose the optimal cluster association algorithm for it to maximize the overall network lifetime. A two-tiered WSN is formed by number of small sensor nodes (SNs), powerful application nodes (ANs), and base-stations (BSs, or gateways). SNs capture, encode, and transmit relevant information to ANs, which then send the combined information to BSs. Assuming the locations of the SNs, ANs, and BSs are fixed, we consider how to associate the SNs to ANs such that the network lifetime is maximized while every node meets its bandwidth requirement. When the SNs are homogeneous (e.g., same bandwidth requirement), we give optimal algorithms to maximize the lifetime of the WSNs;when the SNs are heterogeneous, we give a 2-approximation algorithm that produces a network whose lifetime is within 1/2 of the optimum. We also present algorithms to dynamically update the cluster association when the network topology changes. Numerical results are given to demonstrate the efficiency and optimality of the proposed approaches. In simulation study, comparing network lifetime, our algorithm outperforms other heuristics almost twice.

关键词： sensor nodes

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3rd ieee international conference on Wireless and Mobile computing, Networking and Communications, WiMob 2007

3rd IEEE International Conference on Wireless and Mobile Com...

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3rd ieee international conference on Wireless and Mobile computing, Networking and Communications, WiMob 2007

ISBN: (纸本)0769528899

The proceedings contain 86 papers. The topics discussed include: a modular architecture for providing carrier-grade SIP telephony services;outdoor capacity study utilizing multiple element antennas at the millimeter wave band;UWB channel measurements for measures for hand-portable and wearable devices;a novel linear-programming based approach for near-optimal rate allocation in the UMTS enhanced uplink;performance evaluation of the PRRA MAC protocol for GEO satellite networks;distributed power control in cellular mobile radio systems with time-varying link gains;subchannelization performance for the downlink of a multi-cell OFDMA system;the analysis of the optimal periodic ranging slot number in ieee 802.16 OFDMA systems;software solutions for converting a MIMO-OFDM channel into multiple SISO-OFDM channels;toward a hardware real time SIMO channel emulator;and variable sub-carrier in OFDM to reduce the ICI due to carrier frequency offset and IQ imbalance.

关键词： Orthogonal frequency division multiplexing

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A compilation framework for macroprogramming networked sensors

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3rd ieee international conference on distributed computing in sensor systems

作者： Pathak, Animesh Mottola, Luca Bakshi, Amol Prasanna, Viktor K. Picco, Gian Pietro Univ So Calif Ming Hsieh Dept EE Syst Los Angeles CA 90089 USA Politecn Milan Dept Elect & Informat Milan Italy Univ Trent Dept Informat & Commun Technol Trento Italy

ISBN: (纸本)9783540730897

Macroprogramming-the technique of specifying the behavior of the system, as opposed to the constituent nodes-provides application developers with high level abstractions that alleviate the programming burden in developing wireless sensor network (WSN) applications. However, as the semantic gap between macroprogramming abstractions and node-level code is considerably wider than in traditional programming, converting the high level specification to running code is a daunting process, and a major hurdle to the acceptance of macroprogramming. In this paper, we propose a general compilation framework for a data-driven macroprogramming language that allows for plugging in different modules implementing various stages of compilation. We also demonstrate an actual instantiation of our framework by showing an end-to-end solution for compiling macro-programs. Our compiler provides the final code to be deployed on real nodes as well as an estimate of the costs the running system will incur, e.g., in terms of messages exchanged. We compared the auto-generated code against a hand-coded version for the same application behavior to verify the outcome of our compiler.

关键词： sensor nodes

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