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共 258 条记录，以下是211-220 订阅

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Transparent Integration of Non-IP WSN into IP Based Networks

Transparent Integration of Non-IP WSN into IP Based Networks

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international conference on distributed computing in sensor systems (dcoss)

作者： Torsten Teubler Mohamed A. Hail Horst Hellbruck Electrical Engineering and Computer Sciences Lübeck University of Applied Sciences Germany

Embedded devices connected to the Internet will start an increasing growth of the Internet in near future. Wireless sensor Networks (WSN) will play a major role in that growth. In the past several solutions were proposed to make sensor network sip capable. Today there are IPv6-Stacks available including web servers running on sensor nodes. However, a gateway is always needed to convert the routing protocols and MAC-Layer Protocols including compression of IP packets to run on these devices. the overhead using IPv6 on the nodes is very high in respect of code size and message overhead. therefore, in our approach we design and implement a system based on simple protocols target for sensor network nodes and a flexible gateway working in a hybrid fashion for our sensor network test bed. We successfully integrated this non-IP WSN in the Internet and our test bed is productive available from any computer connected to the Internet for reference. In this paper we present the architecture of our solution and present the implementation details of a standard WSN application that can be used for evaluation.

关键词： Wireless sensor networks IP networks Logic gates Internet Routing protocols Standards

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Maintaining WSN QoS by brokering hibernation decisions through mediation

Maintaining WSN QoS by brokering hibernation decisions throu...

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ieee international conference on distributed computing in sensor systems Workshops (dcossW)

作者： Richard Tynan G. M. P. O'Hare Michael J. O'Grady The Centre for Sensorweb Technologies University College Dublin Dublin Ireland

An established Intelligent Power Management (IPM) strategy for a Wireless sensor Network (WSN) is based on the principal that redundant nodes can be hibernated to conserve their energy. Due to the hibernation, sensed data from the node will be unavailable, which essentially means that the WSN will be blind in the vicinity of the hibernating node. Numerous strategies have been proposed to maintain the the minimum resolution of sensed data required by the application. However, given the potential scale on which a Wireless sensor Network (WSN) can be deployed, multi-hop communication will also be a pivotal component of such a system. When redundant nodes are deployed, which are hibernated opportunistically to conserve energy, it is crucial that sub-graphs of the network are not disconnected by the hibernation of a node. In order to ensure connectivity is preserved for all nodes in the area, a protocol is required that oversees routing integrity is maintained. Since this routing topology must be present at all times, this set represents the minimum number of nodes that must be active at any given time for a functioning network. No work to data has focussed on how these two distinct layers can co-operate in deciding when to hibernate a node. In this work, we propose and test a flexible mechanism where two or more protocols can determine the activity state of a node.

关键词： Redundancy Protocols sensors Wireless sensor networks Topology Routing Sleep

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Robustness in context-aware mobile computing

Robustness in context-aware mobile computing

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ieee international conference on Wireless and Mobile computing, Networking And Communications (WiMob)

作者： Hannes Wolf Klaus Herrmann Kurt Rothermel Institute of Parallel and Distributed Systems Universität Stuttgart Germany

High level context recognition and situation detection are enabling technologies for unobtrusive mobile computing systems. Significant progress has been made in processing and managing context information, leading to sophisticated frameworks, middlewares, and algorithms. Despite great improvements, context aware systems still require a significantly increased recognition accuracy for high-level context information on uncertain sensor data to enable the robust execution of context-aware applications. Recently Adaptable Pervasive Workflows (APF)s have been presented as innovative programming paradigm for mobile context-aware applications. We propose a novel Flow Context System (FlowCon) that builds upon APFs. FlowCon uses structural information from the APF to increase accuracy of uncertain high-level context information up to 49%. this way we make an important step to enable robust execution of mobile context-aware applications.

关键词： Context Blood Accuracy Uncertainty Semantics Mobile communication

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Configuration & deployment of sensor network applications using filesystem abstractions

Configuration & deployment of sensor network applications us...

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ieee international conference on Wireless and Mobile computing, Networking And Communications (WiMob)

作者： Bhanu Pisupati Geoffrey Brown Department of Computer Science Indiana University Bloomington IN USA

Large scale sensor networks are non trivial to deploy due to their heterogeneous, distributed nature. this paper presents a technique to configure and deploy sensor applications on heterogeneous networks that is based on the use of virtual filesystem abstractions. the approach can augment existing sensor software build procedures with the ability to configure and deploy software, all using the filesystem framework. the paper presents an architecture to implement the idea and illustrates its use by means of a prototype. Automation of the configuration and deployment processes by use of scripting based techniques implemented using the filesystem abstractions is described.

关键词： Software Programming Computer architecture Prototypes Workstations Hardware Protocols

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Invited talk: Employing the smartphone (and the smart human) as the mobile sensor

Invited talk: Employing the smartphone (and the smart human)...

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ieee international conference on distributed computing in sensor systems Workshops (dcossW)

作者： Murat Demirbas Computer Science and Engineering Department Suny at Buffalo USA

Summary form only given. Cellphones have been adopted faster than any other technology in human history. As of 2010, the number of cellphone subscribers exceeds 4.5 billion. Recently cellphones (more accurately smartphones) have attracted the attention of networking and ubiquitous computing research communities due to their potential for acting as sensor nodes for city-wide sensing applications. In this talk, I will describe two pieces of my work for employing the smartphone as the mobile sensor. the location information captured in the cellphone are in terms of low level data units, and it is difficult to use these logs for building high level context-based search and collaborative sensing applications. In this first piece of work, we studied the problem of discovering spatiotemporal mobility patterns and mobility profiles from cellphone based location logs. In order to capture the mobility behaviors of cellphone users at a level of abstraction suitable for reasoning and analysis, we introduced formal definitions for the concepts of mobility path (denoting a user's travel from one end-location to another), mobility pattern (denoting a popular travel for the user supported by his mobility paths), and mobility profile (providing a synopsis of a user's mobility behavior by integrating the frequent mobility patterns, contextual data, and time distribution data for the user). Our results from this Mobility Profiler project yield important lessons for employing the smartphone as a mobile sensor. From our experiments on the Reality Mining dataset, we find that users spend approximately 85% of their time in 3-5 favorite locations, such as home, work, shopping. the remaining 15% of user's time is spent in locations that each appear with less than 1% of total time. In the second work, we focused on the practical issues for deploying a crowdsourced sensing system. Despite the ubiquitous availability of the sensor and smartphone devices, the-state-of-the-art falls short of the

关键词： sensors Mobile communication Collaboration Twitter Ubiquitous computing Humans History

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UREA: Uncovered Region Exploration Algorithm for reorganization of mobile sensor nodes to maximize coverage

UREA: Uncovered Region Exploration Algorithm for reorganizat...

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ieee international conference on distributed computing in sensor systems Workshops (dcossW)

作者： Manisha J. Nene Rajendra S. Deodhar Lalit M. Patnaik Department of Applied Mathematics Defence Institute of Advanced Technology Pune India

the recent advances in radio and embedded system technologies have enabled the proliferation of wireless microsensor networks. Such wirelessly connected sensors are released in many diverse environments to perform various monitoring tasks. the effectiveness of these networks is determined to a large extent by the coverage provided by the sensor deployment. the positioning of sensors affect coverage, communication cost and resource management. In this paper we investigate two important aspects of non deterministic sensor node deployment in sensor network. We present a new algorithm called Uncovered Region Exploration Algorithm UREA as a sensor deployment strategy to enhance the coverage after an initial random deployment of sensors. UREA decides a new location based on the uncovered region around the node in consideration. Virtual Force Algorithm VFA designed for the same purpose, calculates new locations of a sensor node based on the locations of the remaining nodes. the performance of UREA is compared with that of VFA. It was observed that with the same number of sensor nodes, UREA provides better coverage than that by VFA in less number of iterations. UREA is found to be consistent and robust. During simulation, it is assumed that the sensor network is a bounded, homogeneous and mobile ad-hoc network. Once the effective sensor positions are identified, a one-time movement of each node is carried out to redeploy the sensors at these new positions. Simulation results clearly show that this onetime displacement of sensor benefits the deployed network so as to improve coverage. In non deterministic deployments, mobility feature of the mobile ad-hoc network can be best exploited to reposition the sensors so as to achieve the best network coverage.

关键词： sensors Clustering algorithms Algorithm design and analysis Mobile communication Mobile computing Computational modeling Wireless sensor networks

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TinyWiFi: Making network protocol evaluation portable across multiple phy-link layers

TinyWiFi: Making network protocol evaluation portable across...

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17th Annual international conference on Mobile computing and Networking, MobiCom'11 and Co-Located Workshops - 6th ACM international Workshop on Wireless Network Testbeds, Experimental Evaluation and Characterization, WiNTECH'11

作者： Alizai, Muhammad Hamad Wirtz, Hanno Kirchen, Bernhard Vaegs, Tobias Gnawali, Omprakash Wehrle, Klaus Communication and Distributed Systems RWTH Aachen University 52056 Aachen Germany Department of Computer Science Stanford University Stanford CA 94305 United States

ISBN: (纸本)9781450308670

Multihop wireless networks, such as sensor-, ad hoc- and mesh-networks, although different share some common characteristics. All these networks exhibit link dynamics. Protocols designed for these wireless networks must overcome the challenge of link dynamics and the resulting churn in network topology. Due to structural and topological similarities, protocols developed for one class of wireless network should also be applicable in the other classes. However, network-layer protocols are usually developed for and tested in only one class of wireless network due to the lack of a platform that allows testing of protocols across different classes of networks. As a result, we unnecessarily constrain the range of settings and scenarios in which we test network protocols. In this paper, we present TinyWifi, a platform for executing native sensornet protocols on Linux-driven wireless devices. TinyWifi builds on nesC code base that abstracts from TinyOS and enables the execution of nesC-based protocols in Linux. Using this abstraction, we expand the applicability and means of protocol execution from one class of wireless network to another without re-implementation. We demonstrate the generality of TinyWifi by evaluating four well-established protocols on ieee 802.11 and 802.15.4 based testbeds using a single implementation. © 2011 ACM.

关键词： Linux

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A new broadcast-key management scheme for distributed wireless sensor networks

A new broadcast-key management scheme for distributed wirele...

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

作者： YingZhi Zeng Yan Xia JinShu Su BaoKang Zhao WanRong Yu School of Computer National University of Defense Technology ChangSha Hunan China School of Computer and Communication Hunan University ChangSha Hunan China

the management of broadcast-key is one of the most important security problems in the distributed wireless sensor networks. Firstly, the broadcast-key should be calculated and used by each node. Secondly, the broadcast-key should also be updated according to the variation of security condition. In this paper, we propose a new broadcast-key management scheme which has many advantages over the famous muTESLA protocol. the analysis in this paper demonstrates its feasibility, efficiency and security for broadcast-key establishment and renewing in distributed wireless sensor networks.

关键词： Broadcasting Wireless sensor networks Computer network management Computer networks Cryptography Broadcast technology Technology management Computer security Protocols distributed computing

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6th ieee international Workshop on sensor Networks and systems for Pervasive computing PerSeNS 2010: Message from the workshop chairs

2010 8th IEEE International Conference on Pervasive Computin...

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2010 8th ieee international conference on Pervasive computing and Communications Workshops, PERCOM Workshops 2010 2010年

作者： Puccinelli, Daniele Anastasi, Giuseppe Giordano, Silvia Switzerland University of Pisa Italy

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Automatic damaged-function alternation among wireless sensor nodes

Automatic damaged-function alternation among wireless sensor...

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international conference on Networked computing and Advanced Information Management (NCM)

作者： Toshiaki Miyazaki Daiki Shitara Graduate School of Computer and Information Systems University of Aizu Fukushima Japan

ISBN: (纸本)9781424476718

We propose a distributed algorithm for function alternations, which enables sensor nodes to take over the damaged functions of their neighboring sensor nodes dynamically in a wireless sensor network. In this paper, after introducing the concept of the function alternation, the algorithm is explained in detail with some evaluation results. Comparing the results obtained using the proposed algorithm with those obtained using non-function alternation methods shows that the proposed algorithm makes the initial functionality of each sensor function sustainable even if some sensor nodes are damaged.

关键词： Wireless communication Wireless sensor networks

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