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Implementation of dijkstra’s Token Circulation on sensor Network

国际计算机前沿大会会议论文集 2015年第1期 40-41页

作者： Zhiqiang Ma Achuan Wang Jifeng Guo Northeast forestry university HeilongjiangHarbin China

sensor networks can consist of large number of sensors. Often, sensors networks use low cost units and thus a subject to malfunctions that can bring the system to inconsistent states. After deployment, the system can be situated in places that are hard to reach and therefore manual reboot operations are undesirable and even unfeasible. Therefore, it is imperative to consider the eventual recovery of arbitrary fault when designing sensor networks. dijkstra’s algorithm is an important foundation of self-managing computer system and fault-tolerance computing system in distributed systems, since it allows a distributed system to recover from arbitrary starting state within a finite time. The arbitrary starting state ca model arbitrary failure (as long as the code segment stays correct).Another key advantage of dijkstra’s asynchronous algorithm is that no global clock is needed. This project tests an implementation of dijkstra’s algorithm using snapshotting techniques that we developed in an earlier work. These sensors can initiate from any state but they come into a consistent one after several cycles of running. We demonstrate the usefulness of our testing technique.

关键词： dijkstra’s algorithm sensor network consistent state

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Development of Global Geographical Coverage Area for Terrestrial Networks Internetworked with Leo satellite Network

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Communications and Network 2014年第4期6卷 228-242页

作者： V. O. C. Eke A. N. Nzeako Department of computer science Ebonyi State University Abakaliki Nigeria Department of Electronic Engineering UNN Enugu State Nigeria

Network planning, analysis and design are an iterative process aimed at ensuring that a new network service meets the needs of subscribers and operators. During the initial start-up phase, coverage is the big issue and coverage in telecommunications systems is related to the service area where a bare minimum access in the wireless network is possible. In order to guarantee visibility of at least one satellite above a certain satellite elevation, more satellites are required in the constellation to provide Global network services. Hence, the aim of this paper is to develop wide area network coverage for sparsely distributed earth stations in the world. A hybrid geometrical topology model using spherical coordinate framework was devised to provide wide area network coverage for sparsely distributed earth stations in the world. This topology model ensures Global satellite continuous network coverage for terrestrial networks. A computation of path lengths between any two satellites put in place to provide network services to selected cities in the world was carried out. A consideration of a suitable routing decision mechanism, routing protocols and algorithms were considered in the work while the shortest paths as well as the alternate paths between located nodes were computed. It was observed that a particular satellite with the central angle of 27°can provide services into the diameter of the instantaneous coverage distance of 4081.3 Km which is typical of wide area network coverage. This implies that link-state database routing scheme can be applied, continuous global geographical coverage with minimum span, minimum traffic pattern and latency are guaranteed. Traffic handover rerouting strategies need further research. Also, traffic engineering resources such as channel capacity and bandwidth utilization schemes need to be investigated. satellite ATM network architecture will benefit and needs further study.

关键词： Network Planning Global Network Coverage Visibility Angle Link-state Database Orthogonal Route Path dijkstra’s Algorithm

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