网络操作系统课程是计算机网络专业的核心课程,DNS服务器和活动目录是学习其他服务器的基础。文章以windows server服务器中的Active Directory和Linux中的BIND为例,利用Oracle VM Virtualbox虚拟机软件搭建实验平台,进行域控分离系统...网络操作系统课程是计算机网络专业的核心课程,DNS服务器和活动目录是学习其他服务器的基础。文章以windows server服务器中的Active Directory和Linux中的BIND为例,利用Oracle VM Virtualbox虚拟机软件搭建实验平台,进行域控分离系统的设计,以达到仿真实验教学的目的。展开更多
In the field of supercomputing, one key issue for scal-able shared-memory multiprocessors is the design of the directory which denotes the sharing state for a cache block. A good direc-tory design intends to achieve t...In the field of supercomputing, one key issue for scal-able shared-memory multiprocessors is the design of the directory which denotes the sharing state for a cache block. A good direc-tory design intends to achieve three key attributes： reasonable memory overhead, sharer position precision and implementation complexity. However, researchers often face the problem that gain-ing one attribute may result in losing another. The paper proposes an elastic pointer directory （EPD） structure based on the analysis of shared-memory applications, taking the fact that the number of sharers for each directory entry is typical y smal . Analysis re-sults show that for 4 096 nodes, the ratio of memory overhead to the ful-map directory is 2.7%. Theoretical analysis and cycle-accurate execution-driven simulations on a 16 and 64-node cache coherence non uniform memory access （CC-NUMA） multiproces-sor show that the corresponding pointer overflow probability is reduced significantly. The performance is observed to be better than that of a limited pointers directory and almost identical to the ful-map directory, except for the slight implementation complex-ity. Using the directory cache to explore directory access locality is also studied. The experimental result shows that this is a promis-ing approach to be used in the state-of-the-art high performance computing domain.展开更多
With the deepening application of geographic information web services, as a significant part, geographic information directory service sets up a service transaction platform between the service providers and the servi...With the deepening application of geographic information web services, as a significant part, geographic information directory service sets up a service transaction platform between the service providers and the service requestors, providing one-stop registration, access and management functions of geographic information web services, so it is very important to carry out the research on geographic information directory service. According to the domestic and overseas metadata standards, the service expression-oriented metadata information model for geographic information web service is established, and the discovery mechanism dominated by geographic information service registration and active discovery is realized accordingly. After that, overall design of directory service model is made, and finally the research results are integrated into the geographic information service software NewMapServer and deployment test is made under the Google Cloud Environment Google App Engine, providing a certain reference for sharing the Smart City construction achievements.展开更多
Based on the general framework of ADDS( Antarctic Data Directory System) established by SCAR- COMNAP ad hoc Planning Group on Antarctic data management,the CN- ADDS( Chinese Antarctic Data Directory System) projecti...Based on the general framework of ADDS( Antarctic Data Directory System) established by SCAR- COMNAP ad hoc Planning Group on Antarctic data management,the CN- ADDS( Chinese Antarctic Data Directory System) projectis go- ing on,of which the research and activity keeps to the available method and technique in ADDS development and allows for the Chinese specific status in Antarctic data man- agementas well.Atpresent,authoring and submitting timely Antarctic data directory in China is one of the key issuesthatisto be dealtwith necessarily.This paper aims at studying the technical procedure in collecting,processing,examining and submitting data directory. In additional,italso discusses the efficient collection of data directory, which needs the effort of administrative and technical support.展开更多
As a prominent journalist and entrepreneur living in Shanghai from 1911 to 1937,the“China Hand”Carl Crow(1884-1945)wrote a lot of works on Chinese newspapers,business,religion and culture.His advertising agency Carl...As a prominent journalist and entrepreneur living in Shanghai from 1911 to 1937,the“China Hand”Carl Crow(1884-1945)wrote a lot of works on Chinese newspapers,business,religion and culture.His advertising agency Carl Crow,Inc.published four editions of Newspaper Directory of China in the year of 1921,1931,1932 and 1935 respectively,and the most popular was the edition of 1935,which had a positive impact on the commercialization and development of the China’s newspaper industry.展开更多
文摘网络操作系统课程是计算机网络专业的核心课程,DNS服务器和活动目录是学习其他服务器的基础。文章以windows server服务器中的Active Directory和Linux中的BIND为例,利用Oracle VM Virtualbox虚拟机软件搭建实验平台,进行域控分离系统的设计,以达到仿真实验教学的目的。
基金supported by the National Natural Science Foundation of China(6123200961370059)+1 种基金the High Technology Research and Development Program of China(863 Program)(2011AA01A205)the Fund of the State Key Laboratory of Software Development Environment(SKLSDE2012ZX06)
文摘In the field of supercomputing, one key issue for scal-able shared-memory multiprocessors is the design of the directory which denotes the sharing state for a cache block. A good direc-tory design intends to achieve three key attributes： reasonable memory overhead, sharer position precision and implementation complexity. However, researchers often face the problem that gain-ing one attribute may result in losing another. The paper proposes an elastic pointer directory （EPD） structure based on the analysis of shared-memory applications, taking the fact that the number of sharers for each directory entry is typical y smal . Analysis re-sults show that for 4 096 nodes, the ratio of memory overhead to the ful-map directory is 2.7%. Theoretical analysis and cycle-accurate execution-driven simulations on a 16 and 64-node cache coherence non uniform memory access （CC-NUMA） multiproces-sor show that the corresponding pointer overflow probability is reduced significantly. The performance is observed to be better than that of a limited pointers directory and almost identical to the ful-map directory, except for the slight implementation complex-ity. Using the directory cache to explore directory access locality is also studied. The experimental result shows that this is a promis-ing approach to be used in the state-of-the-art high performance computing domain.
文摘With the deepening application of geographic information web services, as a significant part, geographic information directory service sets up a service transaction platform between the service providers and the service requestors, providing one-stop registration, access and management functions of geographic information web services, so it is very important to carry out the research on geographic information directory service. According to the domestic and overseas metadata standards, the service expression-oriented metadata information model for geographic information web service is established, and the discovery mechanism dominated by geographic information service registration and active discovery is realized accordingly. After that, overall design of directory service model is made, and finally the research results are integrated into the geographic information service software NewMapServer and deployment test is made under the Google Cloud Environment Google App Engine, providing a certain reference for sharing the Smart City construction achievements.
文摘Based on the general framework of ADDS( Antarctic Data Directory System) established by SCAR- COMNAP ad hoc Planning Group on Antarctic data management,the CN- ADDS( Chinese Antarctic Data Directory System) projectis go- ing on,of which the research and activity keeps to the available method and technique in ADDS development and allows for the Chinese specific status in Antarctic data man- agementas well.Atpresent,authoring and submitting timely Antarctic data directory in China is one of the key issuesthatisto be dealtwith necessarily.This paper aims at studying the technical procedure in collecting,processing,examining and submitting data directory. In additional,italso discusses the efficient collection of data directory, which needs the effort of administrative and technical support.
文摘As a prominent journalist and entrepreneur living in Shanghai from 1911 to 1937,the“China Hand”Carl Crow(1884-1945)wrote a lot of works on Chinese newspapers,business,religion and culture.His advertising agency Carl Crow,Inc.published four editions of Newspaper Directory of China in the year of 1921,1931,1932 and 1935 respectively,and the most popular was the edition of 1935,which had a positive impact on the commercialization and development of the China’s newspaper industry.
