随着北斗报文服务系统、北斗国际搜救服务通过国际组织认可及北斗短报文在国内船舶的应用成效,初步形成北斗海上遇险与安全服务.本文提出北斗全球海上遇险与安全服务体系概念,通过引入广义北斗任务控制中心(BeiDou mission control cent...随着北斗报文服务系统、北斗国际搜救服务通过国际组织认可及北斗短报文在国内船舶的应用成效,初步形成北斗海上遇险与安全服务.本文提出北斗全球海上遇险与安全服务体系概念,通过引入广义北斗任务控制中心(BeiDou mission control center,BD-MCC)给出体系架构组成,并从北斗特色服务、海事通信业务到系统服务层面分析该体系在亚太与全球服务的功能特征,梳理该体系中北斗报文服务系统、北斗国际搜救系统、北斗应急示位搜救系统、北斗船舶远程识别与跟踪系统(long range identification and tracking, LRIT)、北斗船舶保安报警系统(ship security alert system,SSAS)以及北斗海上安全信息播发系统的业务流程及服务规范;展望该体系的系统化、国际化及定制化应用;研究成果有助于推动北斗通导在全球海上遇险与安全业务领域体系化应用.展开更多
Many distributed clouds which try to integrate the advantages of centralized clouds and distributed systems have been studied in recent years.Traditional cloud simulators focus on large scale data centers with virtual...Many distributed clouds which try to integrate the advantages of centralized clouds and distributed systems have been studied in recent years.Traditional cloud simulators focus on large scale data centers with virtualized servers,and cannot meet the needs of distributed cloud simulations.This paper introduces a generalized and extensible simulation framework,named MCloudSim,which is used for modeling and simulating distributed clouds.MCloudSim has the following characteristics;(1)the overlay protocol in MCloudSim can be freely replaced without affecting the function of other modules;(2) a Petri net workflow theory based task model is proposed to simulate distributed tasks;(3) a distributed cloud can be easily built by assembling and expanding the basic resource entities provided by MCloudSim.Finally,simulation results of scenarios with a 3-tier central-controlled distributed cloud and a P2 P based cloud prove that MCloudSim has high efficiency and satisfies performance in supporting large scale experiments and different distributed clouds.展开更多
文摘随着北斗报文服务系统、北斗国际搜救服务通过国际组织认可及北斗短报文在国内船舶的应用成效,初步形成北斗海上遇险与安全服务.本文提出北斗全球海上遇险与安全服务体系概念,通过引入广义北斗任务控制中心(BeiDou mission control center,BD-MCC)给出体系架构组成,并从北斗特色服务、海事通信业务到系统服务层面分析该体系在亚太与全球服务的功能特征,梳理该体系中北斗报文服务系统、北斗国际搜救系统、北斗应急示位搜救系统、北斗船舶远程识别与跟踪系统(long range identification and tracking, LRIT)、北斗船舶保安报警系统(ship security alert system,SSAS)以及北斗海上安全信息播发系统的业务流程及服务规范;展望该体系的系统化、国际化及定制化应用;研究成果有助于推动北斗通导在全球海上遇险与安全业务领域体系化应用.
基金Supported by the National High Technology Research and Development Programme of China(No.2011AA01A102)National Natural Science Foundation of China(No.60903218)+1 种基金Strategic Priority Research Program of Chinese Academy of Sciences(No.XDA06010301)Innovative Program of Institute of Acoustics,Chinese Academy of Sciences(No.Y154211601)
文摘Many distributed clouds which try to integrate the advantages of centralized clouds and distributed systems have been studied in recent years.Traditional cloud simulators focus on large scale data centers with virtualized servers,and cannot meet the needs of distributed cloud simulations.This paper introduces a generalized and extensible simulation framework,named MCloudSim,which is used for modeling and simulating distributed clouds.MCloudSim has the following characteristics;(1)the overlay protocol in MCloudSim can be freely replaced without affecting the function of other modules;(2) a Petri net workflow theory based task model is proposed to simulate distributed tasks;(3) a distributed cloud can be easily built by assembling and expanding the basic resource entities provided by MCloudSim.Finally,simulation results of scenarios with a 3-tier central-controlled distributed cloud and a P2 P based cloud prove that MCloudSim has high efficiency and satisfies performance in supporting large scale experiments and different distributed clouds.
