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jWebDust: A java-based generic application environment for wireless sensor networks

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1st ieee international conference on distributed computing in sensor systems

作者： Chatzigiannakis, I Mylonas, G Nikoletseas, S Res Acad Comp Technol Inst Patras 26110 Greece Univ Patras Dept Comp Engn & Informat Patras 26500 Greece

ISBN: (纸本)3540264221

Wireless sensor networks can be very useful in applications that require the detection of crucial events, in physical environments subjected to critical conditions, and the propagation of data reporting their realization to a control center. In this paper we propose jWebDust, a generic and modular application environment for developing and managing applications that are based on wireless sensor networks. Our software architecture provides a range of services that allow to create customized applications with minimum implementation effort that are easy to administrate. We move beyond the "networking-centric" view of sensor network research and focus on how the end user (administrator, control center supervisor, etc.) will visualize and interact with the system. We here present its open architecture, the most important design decisions, and discuss its distinct features and functionalities. jWebDust allows heterogeneous components to interoperate (real world sensor networks will rarely be homogeneous) and allows the integrated management and control of multiple such networks by also defining web-based mechanisms to visualize the network state, the results of queries, and a means to inject queries in the network. The architecture also illustrates how existing protocols for various services can interoperate in a bigger framework - such as the tree construction, query routing, etc.

关键词： Java programming language

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Defending against sybil attacks in sensor networks

Defending against sybil attacks in sensor networks

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25th ieee international conference on distributed computing systems Workshops, ICDCS 2005

作者： Zhang, Qinghua Wang, Pan Reeves, Douglas S. Ning, Peng Cyber Defense Laboratory Computer Science Department North Carolina State University RaleighNC27695-8207 United States

Sybil attack is a harmful threat to sensor networks, in which a malicious node illegally forges an unbounded number of identities to defeat redundancy mechanisms. Digital certificates are a way to prove identities. However, they are not viable in sensor networks. In this paper, we propose a light-weight identity certificate method to defeat Sybil attacks. Our proposed method uses one-way key chains and Merkle hash trees. The method thereby avoids the need for public key cryptography. In addition, the method provides a means for authentication of all data messages. A variant of this method is presented that has lower computational requirements under certain conditions. The security of each method is analyzed, and is as good or better than previously-proposed approaches, with fewer assumptions. The overhead (computation, storage, and messages) is also shown to be acceptable for use in sensor networks. © 2005 ieee

关键词： Public key cryptography

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Efficiently managing context information for large-scale scenarios

Efficiently managing context information for large-scale sce...

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3rd ieee international conference on Pervasive computing and Communications

作者： Grossmann, M Bauer, M Hönle, N Käppeler, UP Nicklas, D Schwarz, T Univ Stuttgart Inst Parallel & Distributed Syst D-70565 Stuttgart Germany

ISBN: (纸本)0769522998

In this paper, we address the data management aspect of large-scale pervasive computing systems. We aim at building an infrastructure that simultaneously supports many kinds of context-aware applications, ranging from room level up to nation level. This all-embracing approach gives rise to synergetic benefits like data reuse and sensor sharing. We identify major classes of context data and detail on their characteristics relevant for efficiently managing large amounts of it. Based on that, we argue that for large scale systems it is beneficial to have special-purpose servers that are optimized for managing a certain class of context data. In the Nexus project we have implemented five servers for different classes of context data and a very flexible federation middleware integrating all these servers. For each of them, we highlight in which way the requirements of the targeted class of data are tackled and discuss our experiences.

关键词： Information management

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Channel adaptive resources management in wireless mobile computing systems: Issues and new algorithms

Channel adaptive resources management in wireless mobile com...

引用

2005 international conference on Wireless Communications, Networking and Mobile computing, WCNM 2005

作者： Wang, Hui Lin, Xiao-Hui Su, Gong-Chao Yang, Tian Du, Fei Laboratory of Mobile Computing and Distributed Systems Shenzhen University

ISBN: (纸本)078039335X

In a wireless mobile computing system such as ad hoc network or sensor network, it is very difficult to manage resources - the precious bandwidth shared by the mobile terminals and the energy in each mobile terminal - in an efficient manner, due to the lack of network infrastructure support. The difficulties are aggravated by the fact that the wireless link is highly unreliable with high-error rate and bursty errors, and thus, is a CSI (Channel State Information) dependent time-varying function. In this paper, we consider two important issues in mobile computing systems - routing in wireless ad hoc network and energy management in sensor network We argue that the time-varying property of the wireless link can have a great influence on these two issues, and propose two schemes - channel adaptive routing in ad hoc network and channel adaptive energy management in sensor network under such CSI fluctuating environment. As indicated in our numerical studies, our proposed schemes outperform other algorithms without channel adaptation in that higher network throughput and energy efficiency are achieved in their respective application scenarios. © 2005 ieee.

关键词： Mobile computing

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Location-centric storage for sensor networks

Location-centric storage for sensor networks

引用

2nd ieee international conference on Mobile Ad-hoc and sensor systems, MASS 2005

作者： Xing, Kai Cheng, Xiuzhen Li, Jiang Department of Computer Science George Washington University Washington DC 20052 Department of Systems and Computer Science Howard University Washington DC 20059

ISBN: (纸本)0780394666

This paper presents Location-Centric Storage (LCS), a novel distributed data storage protocol for sensor networks. In the protocol, each event detected by sensors is associated with an intensity value (σ)(by sensors), where σ is a parameter that depends on the characteristics of the event and the application context. When event information is broadcast, a sensor decides whether to store the record of an event by checking its distance to the event location and the σ. In general, the higher the intensity of an event, the further its information can propagate geographically in the sensor network. Besides, the closer to the event location, the denser the sensors are that store the event information, and thus the quicker and better a user can know about the event (by reading from surrounding sensors). The protocol utilizes network resource efficiently. In particular, the storage load of sensors is independent of the network size, and is evenly distributed across the network. Moreover, the communication distance for getting event information is small. Therefore, the protocol has great scalability. We provide detailed theoretical analysis and simulation study to support the claims. We also ran simulations to show the advantage of our protocol over some previous work. LCS can be used for applications such as context-dependent information mining in pervasive computing and on-demand warning in surveillance sensor networks. © 2005 ieee.

关键词： sensor data fusion

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A simple two-dimensional coded detection scheme in wireless sensor networks

A simple two-dimensional coded detection scheme in wireless ...

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11th international conference on Parallel and distributed systems Workshops, ICPADS 2005

作者： Pai, Hung-Ta Sung, Jing-Tian Han, Yunghsiang S. Graduate Institute of Communication Engineering National Taipei University Taiwan Department of Electrical Engineering National Taiwan University of Science and Technology Taiwan

ISBN: (纸本)0769522815

Recently an approach that combined the techniques in distributed classification and the ones in error-correcting codes has been proposed to design a fault-tolerant classification system in wireless networks. The codeword implemented at the fusion center is assigned based on each phenomenon and each detection result of every sensor. A local decision represented by one bit is made according to the codeword and the detection result. Thus, the length of the codeword designed is equal to the number of sensors. In this paper, we propose a new distributed detection scheme combined with two-dimensional channel coding. Multiple detections are conducted by each sensor for the same phenomenon. A two-dimensional code that combines the designed code and a repetition code is implemented at the fusion center for decoding. The virtual code length of this two-dimensional code is the code length of the designed code multiplied with the number of detections conducted at each sensor. Compared with the previous methods, the new scheme has higher classification reliability and lower sensor complexity. © 2005 ieee.

关键词： Mobile computing

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A sensor based tracking system using witnesses

A sensor based tracking system using witnesses

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25th ieee international conference on distributed computing systems Workshops, ICDCS 2005

作者： Huang, Jyh-How Mishra, Shivakant Department of Computer Science University of Colorado Campus Box 0430 BoulderCO80309-0430 United States

Search and rescue of people in emergency situations, e.g. lost hikers, stranded climbers, or injured skiers has been difficult due to lack of information about their location at various times. Current location and tracking systems require a connected network via satellites, GSM base stations, or mobile devices. This requirement severely limits their applicability, particularly in remote wilderness areas where maintaining a connected network is very difficult. This paper proposes a new tracking system called Cenwits that is based on sensors that use RF for communication and emit beacons from time to time. When two sensors are in the range of one another, they record the presence of each other and exchange the information they recorded earlier. A sensor dumps all its information to an access point, whenever it is in the range of one. Important advantages of Cenwits include a loosely-coupled system that does not require network connectivity, power efficiency, and low cost. A preliminary prototype of Cenwits is being built using Berkley Mica2 Motes. The paper reports results from this preliminary prototype. © 2005 ieee.

关键词： Tracking (position)

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Bio-inspired sensor swarms to detect leaks in pressurized systems

Bio-inspired sensor swarms to detect leaks in pressurized sy...

引用

ieee systems, Man and Cybernetics Society, Proceedings - 2005 international conference on systems, Man and Cybernetics

作者： Fronczek, Joseph W. Prasad, Nadipuram R. Chemical Engineering Department New Mexico State University Las Cruces NM United States Rio Grande Institute for Soft Computing Klipsch School of Electrical and Computer Engineering New Mexico State University Las Cruces NM United States

Revolutionary technologies for quickly locating and repairing leaks in the pressurized environment of the international Space Station are a critical NASA need. Leaks caused by the malfunction of on-board vacuum systems, or leaks caused by impact with space debris pose very serious safety concerns that must be dealt with rapidly and effectively. The detection of a pressure drop by any one of several primary cabin pressure sensors distributed throughout the pressurized environment will release a swarm of highly sensitive pressure sensors in the vicinity of pressure change. sensors shaped for navigating in microgravity environments compute the air-flow direction and are swept along a decreasing pressure gradient towards the leak. Self-organizing abilities enable the sensor swarm to follow the pressure gradient and quickly detect and plug the leak source. A sensor swarm is a novel bio-inspired technology to detect and fix leaks in any pressurized containment in microgravity environments. ©2005 ieee.

关键词： Biosensors

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An agent-based Grid monitoring system featuring dynamic and on-demand sensor deployment and management

An agent-based Grid monitoring system featuring dynamic and ...

引用

1st international conference on Semantics, Knowledge and Grid, SKG 2005

作者： Li, Yinan Gui, Xiaolin Department of Computer Science and Technology Xi'an Jiaotong University 710049 China

ISBN: (纸本)0769525342

A big challenge of designing and implementing a monitoring system for distributed systems such as the Computational Grid is how to quickly and dynamically deploy and manage a large collection of monitoring sensors. Currently available monitoring systems often use the static sensor deployment mechanism, which makes the sensor deployment quite difficult and inefficient. We have developed an agent-based grid monitoring system that enables fast, dynamic, and on-demand sensor deployment and management. The monitoring system perfectly solves the problem of fast and dynamic sensor deployment using dynamic sensor loading mechanism. In addition, the monitoring system uses software agent technology to solve the problem of dynamic and on-demand sensor management. © 2006 ieee.

关键词： Grid computing

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sensor network coverage restoration

引用

1st ieee international conference on distributed computing in sensor systems

作者： Kumar, N Gunopulos, D Kalogeraki, V Univ Calif Riverside Dept Comp Sci & Engn Riverside CA 92521 USA

ISBN: (纸本)3540264221

Wireless sensor networks are emerging as a new computational platform consisting of small, low-power and inexpensive nodes that integrate a modest amount of sensing, computation and wireless communication capabilities. These have found popular applications in a broad set of areas including environmental monitoring, habitat monitoring and disaster recovery. Typically sensor nodes are deployed over a geographical area for the purpose of detecting, tracking and monitoring events of interest. Reports produced upon the observation of specific events are then processed locally at the sensor nodes and transmitted over multiple hops to a centralized sink in order to reach an operations center or to be analyzed further. Since sensor nodes are deployed in a large land region, the objective is to achieve complete coverage of the region, that is, every location in the region lies in the observation field of at least one sensor node. However the initial placement of sensors may not achieve this goal for various reasons: the number of original sensors may have been too low, the original placement may have been random (for example, sensors deployed from the air) leaving parts of the region uncovered, or, some of the sensors have malfunctioned, leaving coverage holes. In this paper we study the coverage restoration problem in sensor networks. The fundamental question is "Given a two-dimensional area, a piece of land for example, and an initial set of sensors, how can we determine the number of sensor nodes required to completely cover the region". Essentially, the coverage restoration problem reflects how well an area is monitored by sensors. In abstract terms, our approach determines uncovered area in the sensor network field and proposes the deployment of nodes to completely cover the area. Our mechanism consists of two steps: (a) estimating the regions uncovered by sensors and (b) identifying the minimum number and location of sensors required to cover this region. The key idea

关键词： Wireless telecommunication systems

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