The Hefei Light Source-Ⅱ(HLS-Ⅱ) is a vacuum ultraviolet synchrotron light source. The personnel safety system (PSS), which is a personnel access control system, is a crucial part of the HLS-Ⅱ, as it protects the st...The Hefei Light Source-Ⅱ(HLS-Ⅱ) is a vacuum ultraviolet synchrotron light source. The personnel safety system (PSS), which is a personnel access control system, is a crucial part of the HLS-Ⅱ, as it protects the staff and users at HLS-Ⅱfrom radiation damages. The prior version of HLS-Ⅱ PSS was based on an access control system called SiPass. This lacked the personnel management function. Meanwhile, as the prior PSS is a turn-key system, it was not effective for sharing information. To overcome these drawbacks, the novel design of PSS for HLS-Ⅱ is proposed based on the Siemens redundant programmable logic controller under the Experimental Physics and Industrial Control System. The proposed PSS consists of a safety interlock system, access control system, and a radiation monitoring system. The safety interlock system is used to define the interlock logic. The access control system is designed to restrict the access of staff and users at HLS-Ⅱ, and to provide a personnel management function. The radiation monitoring system is used to monitor the radiation dose rate in both the light source and the surrounding areas. This paper details the architecture and the specific design of the novel PSS. The off-line test results demonstrate that the proposed system has achieved the design objectives.展开更多
The Domain Name System(DNS)is suffering from the vulnerabilities exploited to launch the cache poisoning attack.Inspired by biodiversity,we design and implement a non-intrusive and tolerant secure architecture Multi-D...The Domain Name System(DNS)is suffering from the vulnerabilities exploited to launch the cache poisoning attack.Inspired by biodiversity,we design and implement a non-intrusive and tolerant secure architecture Multi-DNS(MDNS)to deal with it.MDNS consists of Scheduling Proxy and DNS server pool with heterogeneous DNSs in it.And the Scheduling Proxy dynamically schedules m DNSs to provide service in parallel and adopts the vote results from majority of DNSs to decide valid replies.And benefit from the centralized control of software defined networking(SDN),we implement a proof of concept for it.Evaluation results prove the validity and availability of MDNS and its intrusion/fault tolerance,while the average delay can be controlled in 0.3s.展开更多
在交互通讯的基础上,海洋平台中控系统包括相对独立的过程控制系统(Process Control System,PCS)、紧急关断系统(Emergency Shutdown,ESD)和火气监控系统(Fire and Gas system,FGS)。本文将ESD 与FGS 集成为设备保护系统(Facilities Pro...在交互通讯的基础上,海洋平台中控系统包括相对独立的过程控制系统(Process Control System,PCS)、紧急关断系统(Emergency Shutdown,ESD)和火气监控系统(Fire and Gas system,FGS)。本文将ESD 与FGS 集成为设备保护系统(Facilities Protection System,FPS),共享一套冗余控制器,以便更好地完成监测、控制、保护以及安全功能。而PCS 和FPS 的冗余控制器通过冗余EtherNet 网络完成交互通讯。同时,PCS 和FPS 都采用冗余电源供电,冗余控制器还通过冗余ControlNet 网络与远程输入/输出(Input and Output,I/O)模块实现冗余通讯。为进一步提高安全性能,FPS 采用了冗余远程I/O 模块设计。实际应用表明,本文提出的海洋平台中控系统能够满足海洋平台石油生产领域应用需求,系统集成性更好,性/价比也更高。展开更多
基金the National Natural Science Foundation of China (No. 113751861).
文摘The Hefei Light Source-Ⅱ(HLS-Ⅱ) is a vacuum ultraviolet synchrotron light source. The personnel safety system (PSS), which is a personnel access control system, is a crucial part of the HLS-Ⅱ, as it protects the staff and users at HLS-Ⅱfrom radiation damages. The prior version of HLS-Ⅱ PSS was based on an access control system called SiPass. This lacked the personnel management function. Meanwhile, as the prior PSS is a turn-key system, it was not effective for sharing information. To overcome these drawbacks, the novel design of PSS for HLS-Ⅱ is proposed based on the Siemens redundant programmable logic controller under the Experimental Physics and Industrial Control System. The proposed PSS consists of a safety interlock system, access control system, and a radiation monitoring system. The safety interlock system is used to define the interlock logic. The access control system is designed to restrict the access of staff and users at HLS-Ⅱ, and to provide a personnel management function. The radiation monitoring system is used to monitor the radiation dose rate in both the light source and the surrounding areas. This paper details the architecture and the specific design of the novel PSS. The off-line test results demonstrate that the proposed system has achieved the design objectives.
基金the National key Research and Development Program of China(No.2016YFB0800100,2016YFB0800101)the National Natural Science Fund for Creative Research Groups Project(No.61521003)the National Natural Science Fund for Youth Found Project(No.61602509).
文摘The Domain Name System(DNS)is suffering from the vulnerabilities exploited to launch the cache poisoning attack.Inspired by biodiversity,we design and implement a non-intrusive and tolerant secure architecture Multi-DNS(MDNS)to deal with it.MDNS consists of Scheduling Proxy and DNS server pool with heterogeneous DNSs in it.And the Scheduling Proxy dynamically schedules m DNSs to provide service in parallel and adopts the vote results from majority of DNSs to decide valid replies.And benefit from the centralized control of software defined networking(SDN),we implement a proof of concept for it.Evaluation results prove the validity and availability of MDNS and its intrusion/fault tolerance,while the average delay can be controlled in 0.3s.
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