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distributed coalition formation in visual sensor networks: A virtual vision approach

引用

3rd ieee international conference on distributed computing in sensor systems

作者： Qureshi, Faisal Terzopoulos, Demetri Univ Toronto Dept Comp Sci Toronto ON Canada Univ Calif Los Angeles Dept Comp Sci Los Angeles CA USA

ISBN: (纸本)9783540730897

We propose a distributed coalition formation strategy for collaborative sensing tasks in camera sensor networks. The proposed model supports task-dependent node selection and aggregation through an announcement/bidding/ selection strategy. It resolves node assignment conflicts by solving an equivalent constraint satisfaction problem. Our technique is scalable, as it lacks any central controller, and it is robust to node failures and imperfect communication. Another unique aspect of our work is that we advocate visually and behaviorally realistic virtual environments as a simulation tool in support of research on large-scale camera sensor networks. Specifically, our visual sensor network comprises uncalibrated static and active simulated video surveillance cameras deployed in a virtual train station populated by autonomously self-animating pedestrians. The readily reconfigurable virtual cameras generate synthetic video feeds that emulate those generated by real surveillance cameras monitoring public spaces. Our simulation approach, which runs on high-end commodity PCs, has proven to be beneficial because this type of research would be difficult to carry out in the real world in view of the impediments to deploying and experimenting with an appropriately complex camera network in extensive public spaces.

关键词： camera sensor networks sensor coordination and control distributed coalition formation video surveillance

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Robcast: A singlehop reliable broadcast protocol for wireless sensor networks

Robcast: A singlehop reliable broadcast protocol for wireles...

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27th international conference on distributed computing systems Workshops, ICDCSW'07

作者： Demirbas, Murat Balachandran, Srivats Department of Computer Science and Engineering University at Buffalo SUNY Buffalo NY 14260

ISBN: (纸本)0769528384

Empirical studies show that wireless sensor networks (WSNs) are extremely prone to the hidden terminal problem. As much as 50% of packet losses have been blamed to the hidden terminal problem under bursty communication. Current protocols use RTS-CTS handshakes to avoid collisions and alleviate the hidden terminal problem for unicast communication. However, it is not possible to directly or efficiently generalize this approach to broadcast communication. Motivated by this problem, we propose Robcast, a round-based self-stabilizing protocol for reliably broadcasting data using receiver-side collision detection feedback. The singlehop level reliability of Robcast can form a building block on which future applications and protocols can be designed for WSNs. ©2007 ieee.

关键词： Wireless sensor networks

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Non-threshold based event detection for 3D environment monitoring in sensor networks

Non-threshold based event detection for 3D environment monit...

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27th international conference on distributed computing systems, ICDCS'07

作者： Li, Mo Liu, Yunhao Chen, Lei Department of Computer Science and Engineering Hong Kong University of Science and Technology

ISBN: (纸本)0769528376

Event detection is a crucial task for wireless sensor network applications, especially environment monitoring. Existing approaches for event detection are mainly based on some predefined threshold values, and thus are often inaccurate and incapable of capturing complex events. For example, in coal mine monitoring scenarios, gas leakage or water osmosis can hardly be described by the overrun of specified attribute thresholds, but some complex pattern in the full-scale view of the environmental data. To address this issue, we propose a non-threshold based approach for the real 3D sensor monitoring environment. We employ energy-efficient methods to collect a time series of data maps from the sensor network and detect complex events through matching the gathered data to spatio-temporal data patterns. Finally, we conduct trace driven simulations to prove the efficacy and efficiency of this approach on detecting events of complex phenomena from real-life records. © 2007 ieee.

关键词： sensor networks

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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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Optimizing end to end routing performance in wireless sensor networks

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3rd ieee international conference on distributed computing in sensor systems

作者： Wang, Chen Zeng, Guokai Xiao, Li Michigan State Univ Dept Comp Sci & Engn E Lansing MI 48824 USA

ISBN: (纸本)9783540730897

The geographic routing is an ideal approach to realize point-to-point routing in wireless sensor networks because packets can be delivered by only maintaining a small set of neighbors' physical positions. The geographic routing assumes that a packet can be moved closer to the destination in the network topology if it is moved geographically closer to the destination in the physical space. This assumption, however, only holds in an ideal model where uniformly distributed nodes communicate with neighbors through wireless channels with perfect reception. Because this model oversimplifies the spatial complexity of a wireless sensor network, the geographic routing may often lead a packet to the local minimum or low quality route. Unlike the geographic forwarding, the ETX-embedding proposed in this paper can accurately encode both a network's topological structure and channel quality to small size nodes' virtual coordinates, which makes it possible for greedy forwarding to guide a packet along an optimal routing path. Our performance evaluation based on both the MICA2 sensor platform and TOSSIM simulator shows that the greedy forwarding based on ETX-embedding outperforms previous geographic routing approaches.

关键词： sensor nodes

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A virtual node-based tracking algorithm for mobile networks

A virtual node-based tracking algorithm for mobile networks

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27th international conference on distributed computing systems, ICDCS'07

作者： Nolte, Tina Lynch, Nancy MIT CSAIL Cambridge MA 02139

ISBN: (纸本)0769528376

We introduce a virtual-node based mobile object tracking algorithm for mobile sensor networks, VINESTALK. The algorithm uses the Virtual Stationary Automata programming layer, consisting of mobile clients, virtual timed machines distributed at known locations in the plane, called virtual stationary automata (VSAs), and a communication service connecting VSAs and mobile clients. VINESTALK maintains a data structure on top of an underlying hierarchical partitioning of the network. In a grid partitioning, operations to find a mobile object distance d away take O(d) time and communication to complete. Updates to the tracking structure after the object has moved a total of d distance take O{d *log network diameter) amortized time and communication to complete. The tracked object may relocate without waiting for VINESTALK to complete updates for prior moves, and while a find is in progress. © 2007 ieee.

关键词： sensor networks

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Temporal privacy in wireless sensor networks

Temporal privacy in wireless sensor networks

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27th international conference on distributed computing systems, ICDCS'07

作者： Kamat, Pandurang Xu, Wenyuan Trappe, Wade Zhang, Yanyong Rutgers University

ISBN: (纸本)0769528376

Although the content of sensor messages describing "events of interest" may be encrypted to provide confidentiality, the context surrounding these events may also be sensitive and therefore should be protected from eavesdroppers. An adversary armed with knowledge of the network deployment, routing algorithms, and the base-station (data sink) location can infer the temporal patterns of interesting events by merely monitoring the arrival of packets at the sink, thereby allowing the adversary to remotely track the spatio-temporal evolution of a sensed event. In this paper, we introduce the problem of temporal privacy for delay-tolerant sensor networks and propose adaptive buffering at intermediate nodes on the source-sink routing path to obfuscate temporal information from an adversary. We first present the effect of buffering on temporal privacy using an information-theoretic formulation and then examine the effect that delaying packets has on buffer occupancy. We evaluate our privacy enhancement strategies using simulations, where privacy is quantified in terms of the adversary's estimation error. © 2007 ieee.

关键词： Wireless sensor networks

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EPMPLCS: An efficient power management protocol with limited cluster size for wireless sensor networks

EPMPLCS: An efficient power management protocol with limited...

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27th international conference on distributed computing systems Workshops, ICDCSW'07

作者： Zahmati, Amir Sepasi Moghadam, Nadieh M. Abolhassani, Bahman Department of Electrical Engineering Iran University of Science and Technology Tehran Iran

ISBN: (纸本)0769528384

Wireless sensor networking, an emerging new field in technology, now opens a vast horizon of application scenarios including environment monitoring, home security and earthquake warning. Since the sensor nodes have limited available power, energy conservation is a critical issue and developing an energy-efficient routing protocol is one of the major issues in wireless sensor networks. In this paper, the authors propose a novel hierarchical routing protocol called Efficient Power Management Protocol with Limited Cluster Size (EPMPLCS) which limits the size of clusters and avoids large energy consumption among cluster-heads and distant members in big clusters thus prolongs the network lifetime. Furthermore, EPMPLCS improves the assumption that the data of different sensors in one cluster are highly correlated. Simulation results show that EPMPLCS performs better than Low-Energy Adaptive Clustering Hierarchy (LEACH). © 2007 ieee.

关键词： Routing protocols

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Domain modelling for ubiquitous computing applications

Domain modelling for ubiquitous computing applications

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21st international conference on Advanced Networking and Applications

作者： Harrington, Anthony Cahill, Vinny Univ Dublin Trinity Coll Sch Comp Sci & Stat Distributed Syst Grp Dublin 2 Ireland

ISBN: (纸本)9780769528472

Many Ubiquitous computing applications can be considered as planning and acting problems in environments characterised by uncertainty and partial observability Such systems rely on sensor data for information about their environment and use stochastic or probabilistic reasoning algorithms to infer system state from sensor data. We propose a domain modelling technique that characterises the sensor and actuator infrastructure and the set of system states in Ubicomp application domains. We capture the location and geometry of all domain model elements and use these spatial properties to tailor system state determination to reflect the quality and spread of the sensor and actuator platform. tThe domain model is used to support the development of Ubicomp applications and allows us calculate the degree of observability that exists over the state space in the environment. The degree of observability over the state space can act as an input into determining the state inference and action selection algorithms used in Ubicomp systems. In this paper we present the design of our Ubicomp domain model. We show that the proposed model contains information necessary to support Ubicomp application development. The expressiveness of the proposed design has been tested by building a model of an Urban Traffic Control application for Dublin city.

关键词： Ubiquitous computing

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A semantics-based middleware for utilizing heterogeneous sensor networks

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3rd ieee international conference on distributed computing in sensor systems

作者： Bouillet, Eric Feblowitz, Mark Liu, Zhen Ranganathan, Anand Riabov, Anton Ye, Fan IBM Corp TJ Watson Res Ctr Hawthorne NY 10532 USA

ISBN: (纸本)9783540730897

With the proliferation of various kinds of sensor networks, we will see large amounts of heterogeneous data. They have different characteristics such as data content, formats, modality and quality. Existing research has largely focused on issues related to individual sensor networks;how to make use of diverse data beyond the individual network level is largely unaddressed. In this paper, we propose a semantics-based approach for this problem and describe a system that constructs applications that utilize many sources of data simultaneously. We propose models to formally describe the semantics of data sources, and processing modules that perform various kinds of operations on data. Based on such formal semantics, our system composes data sources and processing modules together in response to users' queries. The semantics provides a common ground such that data sources and processing modules from various parties can be shared and reused among applications. We describe our system architecture, illustrate application deployment, and share our experiences in the semantic approach.

关键词： Semantics

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