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医院选址问题

于 2021-01-08 发布
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医院选址问题1. 问题描述n个村庄之间的交通图可以用有向网图来表示,图中边上的权值表示从村庄i到村庄j的道路长度。现在要从这n个村庄中选择一个村庄新建一所医院,问这所医院应建在哪个村庄,才能使所有的村庄离医院都比较近?2. 基本要求(1) 建立模型,设计存储结构;(2) 设计算法完成问题求解;(3) 分析算法的时间复杂度。3. 设计思想医院选址问题实际是求有向图中心点的问题。首先定义顶点的偏心度。设图G=(V,E),对任一顶点k,称E(k)=max{d(i, k)}(i∈V)为顶点k的偏心度。显然,偏心度最小的顶点即为图G的中心点。如图7(a)所示是一个带权

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UDs SyCReadDTCInformationRdtCSSBDTC3093.7.35 uDs SvCReadDTCInformationRdtcssbrn3103.7.36 UDS_ SvCReadDTCInformationReportExtended3113.7.37 UDS_SvcReadDTCInformationReportseverity3133.7.38 UDS SVCReadDTCInformationRSIODTC3153,739 UDS SVCReadDTCInformationNoParam3163. 7.40 UDS_SvcInputoutput contro l byIdentifier3,7. 41 UDs SyCRoutinecontrol319PCAN-UDS APi- User Manual3.7.42 UDS_SvcRequestDown load3213.7.43 UDS_ SVCRequestupload32337.44 UDS SyCTransferData3253.7.45 UDS_SVCRequestTransferExit3263.8 Definitions3293.8.1 PCAN-UDS Handle Definitions3293.8.2 Parameter value defintions3313.8.3 TPUDSMsg Member value Definitions3323.8.4 PCAN-UDs Service parameter Definitions3334 Additional Information3354.1 PCAn Fundamentals33542 PCAN-Basic3364.3 UDS and ISO-TP Network Addressing Information3384.3.1 ISO-TP network addressing format3384.4 USing Events3405 License Information3426PCAN-UDS APi- User Manual1 PCAn-UDS APi DocumentationWelcome to the documentation of PCan-UD APl, a PEAK CAN API that implements ISo 15765-3, UDS in CANan international standard that allows a diagnostic tester(client) to control diagnostic functions in an on-vehicleElectronic Control Unit(ECU or serveIn the following chapters you will find all the information needed to take advantage of this aPlIntroduction on page 8DLL API Reference on page 10Additional Information on page 335PCAN-UDS APi- User Manual2 IntroductionPCAN-UDS is a simple programming interface intended to support windows automotive applications that usePEAK-Hardware to communicate with Electronic Control Units(ECU) connected to the bus systems of a car, formaintenance purpose2.1 Understanding PCAN-UDSUDS stands for Unified Diagnostic Services and is a communication protocol of the automotive industry. thisprotocol is described in the norm iSo 14229-1The UDS protocol is the result of 3 other standardized diagnostic communication protocolsIS0 14230-3, as known as Keyword 2000 Protocol(KWP2000L IS0 15765-3, as known as diagnostic on CANISo 15765-2, as known as ISo-TPThe idea of this protocol is to contact all electronic data units installed andCAN OBDninterconnected in a car, in order to provide maintenance, as checking for errors,actualizing of firmware, etcUDS is a Client/Server oriented protocol. 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PCAN-UDS, PCAN-ISO-TP and PCan-Basic apis are free and available for allFigure 1: Relationship of thepeople that acquire a pCAn-hardware2.2 Using PCAN-UDSSince PCAN-UDS API is built on top of the PCAN-1So-TP API and PCAN-Basic APls, it shares similar functions. Itoffers the possibility to use several PCAn-UDS (PUds) channels within the same application in an easy way. Thecommunication process is divided in 3 phases: initialization interaction and finalization of a puds-channelInitialization In order to do UDS on CAN communication using a channel, it is necessary to initialize it first. 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