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Usage of Pythagorean Triple Sequence in OSPF

Communications and Network 2012年第1期4卷 73-82页

作者： Simon Tembo ken-ichi yukimatsu Shohei Kamamura Takashi Miyamura Kohei Shiomoto Atsushi Hiramatsu Department of Computer Science and Engineering Akita University Akita City Japan NTT Network Service Systems Laboratories NTT Corporation Tokyo Japan

Shutting down a link for the purposes of a scheduled routine maintenance does cause the forwarding path to change. If these changes are not done in a required order will cause not only transient micro loops but also an overload in some links. Currently, some ISP operators use a graceful link shutdown procedure by first setting up the Interior Gateway Protocol (IGP) link metric to MAX_METRIC -1 and then shutdown the link. In this paper, we present a Pythagorean Triple Metric Sequence as a method to use to shutdown a link during such network operations. Conducting a link shutdown of any desired link for maintenance purpose is a very delicate duty that requires extreme care to prevent transient loops during such topological changes. We thus wish to demonstrate that there exists a Pythagorean Triple Metric Sequence for any given link that can be used to shutdown a link during the routine maintenance by ISPs.

关键词： MAX_METRIC Link Shutdown Pythagorean Triple Metric Sequence Target Metric Forwarding Path Planned Failures

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Intelligent Transportation Systems Using Short Range Wireless Technologies

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Journal of Transportation Technologies 2011年第4期1卷 132-137页

作者： Razi Iqbal kenichi yukimatsu 不详

In this paper, we propose using ZigBee for Intelligent Transportation System (ITS). Most of the accidents these days are caused because of drivers not knowing the upcoming traffic hurdles like curves, traffic signals, railway lines and etc. If drivers come to know about the upcoming signals, curves, and railways lines etc the accidents can be avoided. The aim is to provide drivers with intelligent roads so that they can receive the information about the curves and the traffic signals ahead. After receiving the information about the signals ahead, drivers will be careful;this will help avoid the road accidents. Many researches are taking place in the world in the field of ITS and many useful systems are also built but no system is built using this remarkable ZigBee technology. ZigBee is low cost as compared to other short range wireless technologies which will help reduce the total cost of the system, enabling this system to be deployed in developing countries as well.

关键词： ITS Short Range Wireless Technologies Wi-Fi GPS

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