This paper presents a novel time synchronization method in real-time wireless sensor networks. Firstly, time synchronization algorithms in common distributed system are reviewed and essential requirements in the desig...
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ISBN:
(纸本)078039335X
This paper presents a novel time synchronization method in real-time wireless sensor networks. Firstly, time synchronization algorithms in common distributed system are reviewed and essential requirements in the design of synchronization methods for wireless sensor network are proposed. Then, Reference Broadcast Synchronization (RBS), a very efficient method, is introduced and the probabilistic technique is applied to RBS in order to improve the performance. After that, a new method, namely partial delay measurement time synchronization, is proposed in this paper to optimize RBS further. At last, the algorithm is implemented on MICA, a wireless sensor platform, and the results illustrate the feasibility and reliability of the new method. It is shown theoretically and experimentally that the probabilistic time synchronization introduced in this paper is able to acquire satisfactory accuracy with less computational costs than such algorithms developed in common distributedsystems.
This paper formally defines recognition as a new security principle closely related to authentication. Low-power sensor networks with no pre-deployment information require the less authoritative security of recognitio...
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ISBN:
(纸本)0769523285
This paper formally defines recognition as a new security principle closely related to authentication. Low-power sensor networks with no pre-deployment information require the less authoritative security of recognition. We give general properties of recognition protocols based on the method of key disclosure. We examine previously proposed low-power protocols according to the environment and security model presented. Finally, we give measurements from an implementation of a recognition protocol called Zero Common-Knowledge and discuss how well this proof-of-concept satisfies the properties of the environment.
Multi-Agent systems (MAS) are an efficient approach to deal with distributed complex problems. However, they are slightly suited to optimization ones. In order to tackle this problem we present a model to specify Mult...
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In this paper, we introduce a concrete, practical Ubiquitous Organizational Information (UOI) service framework, providing novice users intelligent and useful services with respect to the environment. The UOI framewor...
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While Web Services already provide distributed operation execution, the registration and discovery with UDDI is still based on a centralized design. This paper build a distributed discovery service, based on a peer-to...
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Mobile ad-hoc networks (MANETs) comprise computer nodes which communicate over wireless links without any central control. Therefore, they must be able to make fully autonomous security decisions. This introduces new ...
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The next generation resource monitoring system in distributedcomputing environments should not only accurately monitor the environment but also automatically reconfigure the environment. In this paper, we present INA...
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Embedded systems are often distributed and deployed in various environments. Wireless sensor nodes deposited in various places provide light, temperature, humidity, and other measurements. Wireless nodes attached to c...
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ISBN:
(纸本)0780393058
Embedded systems are often distributed and deployed in various environments. Wireless sensor nodes deposited in various places provide light, temperature, humidity, and other measurements. Wireless nodes attached to circuits or appliances sense the current or control the usage. Wireless sensor networks are application-specific. Because of this they have to involve both software and hardware. They also use protocols which relate to both the application and wireless network. The applications using wireless sensor networks are the consumer devices supporting multimedia applications, for example, personal digital assistants, network computers, and mobile communication devices. Emerging embedded systems run multiple applications such as Web-browsers, audio and video communication applications. We describe design issues in wireless networks to support sensors and embedded systems communication and information processing.
This paper describes the issues confronted by the *** project in creating a volunteer computing project using a large legacy climate model application. This application typically takes from weeks to months to complete...
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Our key project, CROWN (China Research and Development Environment Over Wide-area Network), aims to empower in-depth integration of resources and cooperation of researchers nationwide and worldwide using grid technolo...
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