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检索条件"任意字段=First IEEE International Conference on Distributed Computing in Sensor Systems, DCOSS 2005"

共 1159 条记录，以下是331-340 订阅

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Poster Abstract: Low-Power Wireless Channel Quality Estimation in the Presence of RF Smog

Poster Abstract: Low-Power Wireless Channel Quality Estimati...

引用

international conference on distributed computing in sensor systems (dcoss)

作者： Anwar Hithnawi Hossein Shafagh Simon Duquennoy Department of Computer Science ETH Zurich SICS Swedish ICT AB Kista Sweden

Low-power wireless networks deployed in indoor environments inevitably encounter high-power Cross Technology Interference (CTI) from a wide range of wireless devices operating in the shared RF spectrum bands. This severely reduces the performance of such networks and possibly causes loss of connectivity, which affects their availability and drains their resources. In this work, to address the channel uncertainty, a consequence of CTI, we propose a novel channel metric that (i) harnesses the local knowledge of a node about the wireless channel to discern the presence of persistent high-power interferers, and (ii) assists the node in inferring its proximity to the dominant interference sources in the physical space. In order to motivate and validate the necessity of such a metric, we empirically characterize the impact of the interaction between high/low-power cross technology interferers and ieee 802.15.4.

关键词： Interference Wireless communication ieee 802.15 Standards Measurement Wireless sensor networks Cameras Radio frequency

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A Dual-sensor Enabled Indoor Localization System with Crowdsensing Spot Survey

A Dual-Sensor Enabled Indoor Localization System with Crowds...

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international conference on distributed computing in sensor systems (dcoss)

作者： Chi Zhang Jun Luo Jianxin Wu Nanyang Technological University Singapore Nanjing University Nanjing China

We present MaWi - a smart phone based scalable indoor localization system. Central to MaWi is a novel framework combining two self-contained but complementary localization techniques: Wi-Fi and Ambient Magnetic Field. Combining the two techniques, MaWi not only achieves a high localization accuracy, but also effectively reduces human labor in building fingerprint databases: to avoid war-driving, MaWi is designed to work with low quality fingerprint databases that can be efficiently built by only one person. Our experiments demonstrate that MaWi, with a fingerprint database as scarce as one data sample at each spot, outperforms the state-of-the-art proposals working on a richer fingerprint database.

关键词： ieee 802.11 Standards Magnetometers Databases Accuracy Stability analysis Smart phones Safety

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Healing Wireless sensor Networks from Malicious Epidemic Diffusion

Healing Wireless Sensor Networks from Malicious Epidemic Dif...

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international conference on distributed computing in sensor systems (dcoss)

作者： Nicola Roberto Zema Enrico Natalizio Michael Poss Giuseppe Ruggeri Antonella Molinaro DIIES Department University “Mediterranea” of Reggio Calabria Italy Lab. Heudiasyc CNRS France

Leveraging the concept of controlled node mobility in this paper we develop an algorithm for tracking and controlling proximity malware propagation in Wireless sensor Networks (WSN). Our proposal aims at: (i) notifying the nodes of malwarepropagation, (ii) leading a flying robot along a path in the WSNthat guarantees the minimum recovery time to (iii) heal the infected nodes. We formulate the targeted curing problem as a binary integer problem and determine the optimal solution by a central solver. We use the analytical result as a benchmark to evaluate the recovery time of the proposed solution. The achieved results show a satisfactory performance in terms of tracking the presence of an ongoing epidemic and healing the nodes.

关键词： Wireless sensor networks Malware Curing Search problems Operating systems Wireless communication Immune system

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Dimensioning of Wireless sensor and Actuator Networks for Guaranteed Delivery Time

Dimensioning of Wireless Sensor and Actuator Networks for Gu...

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international conference on distributed computing in sensor systems (dcoss)

作者： Petcharat Suriyachai Department of Computer Engineering Prince of Songkla University Thailand

Wireless sensor and actuator network (WSAN) applications are used in many critical scenarios. For instance, upon receiving an over-threshold pressure value, the control station of a gas separation plant issues a command to corresponding actuators to close gas valves to prevent a fire accident. In such control-loop systems, messages must be transported reliably within a tight deadline. This paper presents two components: a new network dimensioning method and a simple MAC protocol, to support control-loop systems in WSANs. The dimensioning method is used to specify the worst-case network topology, traffic and node forwarding rates prior to a network deployment. The MAC protocol is designed to ensure that the specifications and design assumptions are not violated in a subsequent deployment. The experimental evaluation clearly indicates that messages are delivered within the guaranteed delay bound.

关键词： Delays Media Access Protocol Actuators Topology Network topology Synchronization

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Cooperative Modulation Diversity Applied to Heterogeneous Wireless sensor Networks

Cooperative Modulation Diversity Applied to Heterogeneous Wi...

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international conference on distributed computing in sensor systems (dcoss)

作者： Marcelo Portela Sousa Waslon Terllizzie Araujo Lopes Francisco Madeiro Marcelo S. Alencar Institute for Advanced Studies in Communications (Iecom) PB Brazil Polytechnic School of Pernambuco University of Pernambuco PE Brazil

The technology of Wireless sensor Networks (WSNs) has been applied to automatic monitoring systems, and used in a wide variety of environments. In this paper, the authors evaluate the performance of a cooperative technique, applied to heterogeneous WSNs. The main contribution is the analysis of the impacts between the energy factor, the channel Signal-to-Noise Ratio (SNR) and the packet loss rate. The analysis also considers the energy consumption aspect. The cooperative modulation diversity performance is evaluated for different propagation scenarios and for two values of interleaving depth (K). A large value for K, leads the network to present lower values of packet lost rate. Some limiting conditions are obtained and the retransmission algorithm is discussed.

关键词： Signal to noise ratio Wireless sensor networks Phase shift keying Packet loss Fading

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Symmetric Coherent Link Degree, Adaptive Throughput-Transmission Power for Wireless sensor Networks

Symmetric Coherent Link Degree, Adaptive Throughput-Transmis...

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international conference on distributed computing in sensor systems (dcoss)

作者： Konstantinos Chantzis Dimitrios Amaxilatis Ioannis Chatzigiannakis José Rolim Centre Universitaire d' Informatique Geneva Switzerland Computer Technology Institute & Press (CTI) University of Patras Greece

Topology Control Protocols configure transmission power of nodes in order to achieve specific properties to a given topology. These properties include the creation and maintenance of neighborhoods or other topological entities (like trees or clusters), load balancing in terms of connectivity degrees and provision of link symmetry. We see topology control as a two-fold problem where topological properties can also be affected by local network throughput. We propose SCLD-A2TP, a protocol that operates in a two phase adaptive scheme. first transmission power is adaptively adjusted with low throughput settings and nodes achieve a sufficient degree of symmetric and coherent links. Secondly throughput is maximized insofar as the degree is maintained. We assess various distributed heuristics for SCLD-A2TP via test bed experiments and show that up to an extend, link quality and symmetry as well as degree conformity of links can be regulated successfully by transmission power and adaptive throughput control.

关键词： Topology Monitoring Throughput Wireless sensor networks Protocols Interference Oscillators

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Near-Optimal Deterministic Steiner Tree Maintenance in sensor Networks

Near-Optimal Deterministic Steiner Tree Maintenance in Senso...

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international conference on distributed computing in sensor systems (dcoss)

作者： Gokarna Sharma Costas Busch School of Electrical Engineering and Computer Science Louisiana State University Baton Rouge LA USA

We consider the group communication maintenance problem between a set of k mobile agents that are tracked by a static sensor network. We develop a scalable deterministic distributed algorithm for maintaining a Steiner tree of the agents so that group communication between them can be provided in the minimum cost possible. The main idea is that our algorithm maintains a virtual tree of mobile agents which can be immediately converted to an actual Steiner tree at all times. Our algorithm achieves the Steiner tree with total length at most O (log k) times the length of the minimum Steiner tree in the constant-doubling graph model. The total communication cost (messages) to maintain the Steiner tree is only O (min {log n, log D}) times the optimal communication cost, where n and D, respectively, are the number of nodes and the diameter of the network. We also develop improved algorithms for the k-center, sparse aggregation, and distributed matching problems. Experimental evaluation results show the benefits of our algorithms compared to previous algorithms. These four problems are NP-hard and, to the best of our knowledge, our algorithms are the first near-optimal deterministic algorithms for maintaining approximate solutions to these problems with low maintenance costs in a distributed setting.

关键词： Steiner trees Maintenance engineering Approximation methods Approximation algorithms Mobile agents Peer-to-peer computing Robot sensing systems

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Compressive Sensing Based Data Gathering in Clustered Wireless sensor Networks

Compressive Sensing Based Data Gathering in Clustered Wirele...

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international conference on distributed computing in sensor systems (dcoss)

作者： Minh Tuan Nguyen Keith A. Teague Thai Nguyen University of Technology (TNUT) Thai Nguyen city Vietnam School of Electrical and Computer Engineering Oklahoma State University

In this paper, we study the integration between Compressed Sensing (CS) and clustering methods in Wireless sensor Networks (WSNs) that significantly reduce power consumption for the networks. In theory, a base station (BS) needs to collect M measurements from the network with N sensors, then applies CS to obtain precisely all N sensor readings. In clustered networks, a cluster-head (CH) collects data from non-CH sensors in its cluster, adds all received and its own data then send the combined measurement to the BS. We further analyze the clustered network with the measurement matrix created by clustering methods, and formulate the total power consumption. Finally, we suggest the optimal number of clusters for the networks consume the least power in practice.

关键词： Power demand Wireless sensor networks Power measurement sensors Sparse matrices Discrete cosine transforms Measurement uncertainty

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FlashTrack: A Fast, In-network Tracking System for sensor Networks

FlashTrack: A Fast, In-network Tracking System for Sensor Ne...

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international conference on distributed computing in sensor systems (dcoss)

作者： Hao Jiang Jiannan Zhai Jason O. Hallstrom School of Computing Clemson University

We revisit the classic object tracking problem with a novel and effective, yet straightforward distributed solution for resource-lean devices. The difficulty of object tracking lies in the mismatch between the limited computational capacity of typical sensor nodes and the processing requirements of typical tracking algorithms. In this paper, we introduce an in-network system for tracking mobile objects using resource-lean sensors. The system is based on a distributed, dynamically-scoped tracking algorithm which alters the event detection region and reporting rate based on object speed. A leader node records the detected samples across the event region and estimates the object's location in situ. We study the performance of our tracking implementation on an 80-node test bed. The results show that it achieves high performance, even for very fast objects, and is readily implemented on resource-lean sensors. While the area is well-studied, the unique combination of algorithmic features represents a significant addition to the literature.

关键词： Target tracking Synchronization Radar tracking Signal processing algorithms sensors Heuristic algorithms

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sensor Localization via Diversely Polarized Antennas

Sensor Localization via Diversely Polarized Antennas

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international conference on distributed computing in sensor systems (dcoss)

作者： Marco Antonio Marques Marinho Edison Pignaton de Freitas João Paulo Carvalho Lustosa da Costa Rafael Timóteo de Sousa Department of Electrical Engineering (ENE) University of Brasília (UnB)

Wireless sensor networks (WSNs) are currently employed in a vast number of different applications ranging from home automation and health care to military systems. Although their application may vary greatly, WSNs share a common set of characteristics such as a limited energy supply and simple hardware. A common issue related with the application of WSNs is sensor localization, for some types of applications it is important that the sensors know the relative or absolute position of other sensors in the network, such as surveillance of monitoring networks. If sensors are randomly placed they may resort a wide range of methods such as Global Navigation Satellite systems (GNSS) or received signal strength indicators (RSSI). In this work we present an alternative to relative sensor localization by employed a crossed dipole antenna in the reception and a known polarization in the transmission. The accuracy of the proposed methods is measured trough numerical simulations and results are presented.

关键词： Estimation Direction-of-arrival estimation Wireless sensor networks Antenna arrays Signal to noise ratio Global Positioning System Dipole antennas

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