Unified identity authentication has become the basic information service provided by colleges and universities for teachers and students. Security, stability, high concurrency and easy maintenance are our requirements...Unified identity authentication has become the basic information service provided by colleges and universities for teachers and students. Security, stability, high concurrency and easy maintenance are our requirements for a unified identity authentication system. Based on the practical work experience of China University of Geosciences (Beijing), this paper proposes a high availability scheme of unified identity authentication system based on CAS, which is composed of multiple CAS Servers, Nginx for load balancing, and Redis as a cache database. The scheme has been practiced in China University of Geosciences (Beijing), and the application effect is good, which has practical reference significance for other universities.展开更多
Highly security-critical system should possess features of continuous service. We present a new Robust Disaster Recovery System Model （RDRSM）. Through strengthening the ability of safe communications, RDRSM guarante...Highly security-critical system should possess features of continuous service. We present a new Robust Disaster Recovery System Model （RDRSM）. Through strengthening the ability of safe communications, RDRSM guarantees the secure and reliable command on disaster recovery. Its self-supervision capability can monitor the integrality and security of disaster recovery system itself. By 2D and 3D rea-time visible platform provided by GIS, GPS and RS, the model makes the using, management and maintenance of disaster recovery system easier. RDRSM possesses predominant features of security, robustness and controllability. And it can be applied to highly security-critical environments such as E-government and bank. Conducted by RDRSM, an important E-government disaster recovery system has been constructed successfully. The feasibility of this model is verified by practice. We especially emphasize the significance of some components of the model, such as risk assessment, disaster recovery planning, system supervision and robust communication support.展开更多
The use of technology has increased vastly and today computer systems are interconnected via different communication medium. The use of distributed systems in our day to day activities has solely improved with data di...The use of technology has increased vastly and today computer systems are interconnected via different communication medium. The use of distributed systems in our day to day activities has solely improved with data distributions. This is because distributed systems enable nodes to organise and allow their resources to be used among the connected systems or devices that make people to be integrated with geographically distributed computing facilities. The distributed systems may lead to lack of service availability due to multiple system failures on multiple failure points. This article highlights the different fault tolerance mechanism in distributed systems used to prevent multiple system failures on multiple failure points by considering replication, high redundancy and high availability of the distributed services.展开更多
Despite the rapid evolution in all aspects of computer technology, both the computer hardware and software are prone to numerous failure conditions. In this paper, we analyzed the characteristic of a computer system a...Despite the rapid evolution in all aspects of computer technology, both the computer hardware and software are prone to numerous failure conditions. In this paper, we analyzed the characteristic of a computer system and the methods of constructing a system, proposed a communication link management model supporting high availability for network applications, Which will greatly increase the high availability of network applications. Then we elaborated on heartbeat or service detect, fail-over, service take-over, switchback and error recovery process of the model. In the process of constructing the communication link, we implemented the link management and service take-over with high availability requirement, and discussed the state and the state transition of building the communication link between the hosts, depicted the message transfer and the start of timer. At Last, we applied the designed high availability system to a network billing system, and showed how the system was constructed and implemented, which perfectly satisfied the system requirements. Key words high availability - service take-over - fail-over - communication link management CLC number TP 393 Foundation item: Supported by the National Natural Science Foundation of China (60132030)Biography: Luo Juan (1974-), female, Ph. D candidate, research direction: high speed network and information security.展开更多
影像归档和通信系统(Picture Archiving and Communication System,PACS)是医院信息系统的重要组成部分,其主要作用是采集、传输和处理影像设备所产生的图像,实现全院的数字化存储与共享。随着医院检查业务的不断增加,设备特别是高精密...影像归档和通信系统(Picture Archiving and Communication System,PACS)是医院信息系统的重要组成部分,其主要作用是采集、传输和处理影像设备所产生的图像,实现全院的数字化存储与共享。随着医院检查业务的不断增加,设备特别是高精密设备的投入以及第三方系统的影像接口需求导致了PACS存在传输慢、调阅慢的问题,影响了临床的诊断和后续的治疗。文章从系统分布式架构的后台设计、应用的集群、数据库的同步和存储的设计这几方面阐述了系统的设计,从而有效解决系统响应慢、性能弱的问题。展开更多
针对医疗影像归档和通信系统(Picture Archiving and Communication System,PACS)建设所面临的建设成本高、上线周期长、可用性低、故障恢复困难、资源灵活性差等问题,文章设计了一种基于公有云的医疗PACS高可用系统。文章介绍了医疗PAC...针对医疗影像归档和通信系统(Picture Archiving and Communication System,PACS)建设所面临的建设成本高、上线周期长、可用性低、故障恢复困难、资源灵活性差等问题,文章设计了一种基于公有云的医疗PACS高可用系统。文章介绍了医疗PACS高可用系统架构,详述了高可用平台设计、系统安全及可靠性设计和故障切换策略等内容。该系统以公有云技术为基础,结合专业的高可用集群软件,降低了医疗PACS的建设成本,增强了PACS的可靠性和可用性,提升了PACS资源配置的灵活性,更好地支撑了医疗PACS的建设和运行。展开更多
文摘Unified identity authentication has become the basic information service provided by colleges and universities for teachers and students. Security, stability, high concurrency and easy maintenance are our requirements for a unified identity authentication system. Based on the practical work experience of China University of Geosciences (Beijing), this paper proposes a high availability scheme of unified identity authentication system based on CAS, which is composed of multiple CAS Servers, Nginx for load balancing, and Redis as a cache database. The scheme has been practiced in China University of Geosciences (Beijing), and the application effect is good, which has practical reference significance for other universities.
基金Supported by the 10th Five Year High-Tech Researchand Development Plan of China (2002AA1Z67101)
文摘Highly security-critical system should possess features of continuous service. We present a new Robust Disaster Recovery System Model （RDRSM）. Through strengthening the ability of safe communications, RDRSM guarantees the secure and reliable command on disaster recovery. Its self-supervision capability can monitor the integrality and security of disaster recovery system itself. By 2D and 3D rea-time visible platform provided by GIS, GPS and RS, the model makes the using, management and maintenance of disaster recovery system easier. RDRSM possesses predominant features of security, robustness and controllability. And it can be applied to highly security-critical environments such as E-government and bank. Conducted by RDRSM, an important E-government disaster recovery system has been constructed successfully. The feasibility of this model is verified by practice. We especially emphasize the significance of some components of the model, such as risk assessment, disaster recovery planning, system supervision and robust communication support.
文摘The use of technology has increased vastly and today computer systems are interconnected via different communication medium. The use of distributed systems in our day to day activities has solely improved with data distributions. This is because distributed systems enable nodes to organise and allow their resources to be used among the connected systems or devices that make people to be integrated with geographically distributed computing facilities. The distributed systems may lead to lack of service availability due to multiple system failures on multiple failure points. This article highlights the different fault tolerance mechanism in distributed systems used to prevent multiple system failures on multiple failure points by considering replication, high redundancy and high availability of the distributed services.
文摘Despite the rapid evolution in all aspects of computer technology, both the computer hardware and software are prone to numerous failure conditions. In this paper, we analyzed the characteristic of a computer system and the methods of constructing a system, proposed a communication link management model supporting high availability for network applications, Which will greatly increase the high availability of network applications. Then we elaborated on heartbeat or service detect, fail-over, service take-over, switchback and error recovery process of the model. In the process of constructing the communication link, we implemented the link management and service take-over with high availability requirement, and discussed the state and the state transition of building the communication link between the hosts, depicted the message transfer and the start of timer. At Last, we applied the designed high availability system to a network billing system, and showed how the system was constructed and implemented, which perfectly satisfied the system requirements. Key words high availability - service take-over - fail-over - communication link management CLC number TP 393 Foundation item: Supported by the National Natural Science Foundation of China (60132030)Biography: Luo Juan (1974-), female, Ph. D candidate, research direction: high speed network and information security.
文摘影像归档和通信系统(Picture Archiving and Communication System,PACS)是医院信息系统的重要组成部分,其主要作用是采集、传输和处理影像设备所产生的图像,实现全院的数字化存储与共享。随着医院检查业务的不断增加,设备特别是高精密设备的投入以及第三方系统的影像接口需求导致了PACS存在传输慢、调阅慢的问题,影响了临床的诊断和后续的治疗。文章从系统分布式架构的后台设计、应用的集群、数据库的同步和存储的设计这几方面阐述了系统的设计,从而有效解决系统响应慢、性能弱的问题。
文摘针对医疗影像归档和通信系统(Picture Archiving and Communication System,PACS)建设所面临的建设成本高、上线周期长、可用性低、故障恢复困难、资源灵活性差等问题,文章设计了一种基于公有云的医疗PACS高可用系统。文章介绍了医疗PACS高可用系统架构,详述了高可用平台设计、系统安全及可靠性设计和故障切换策略等内容。该系统以公有云技术为基础,结合专业的高可用集群软件,降低了医疗PACS的建设成本,增强了PACS的可靠性和可用性,提升了PACS资源配置的灵活性,更好地支撑了医疗PACS的建设和运行。
