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关键词： 智能建筑   CAN总线   通信协议   标识符  

摘要： 从研究CAN2.0B总线规范入手,介绍了CAN总线规范的硬件基础,分析了CAN总线报文格式,通过对报文标识符的分配,设计了应用于该系统的通信协议,并给出了软件设计流程,较好地解决了智能建筑监控系统通信过程中的仲裁问题。

关键词： 高速公路网   中国   数字编号   放射线   公里   联络线   阿拉伯   标识符  

摘要： 中国国家高速公路网采用放射线与纵横网格相结合布局方案，由7条首都放射线、9条南北纵线和18条东西横线组成，简称为“7918”网，总规模约8．5万公里，其中主线6．8万公里，地区环线、联络线等其它路线约1．7万公里。中国国家高速公路网编号统一由字母标识符和阿拉伯数字编号组成。

关键词： INFORMATION services   DATA transmission systems   ETHERNET (Local area network system)   ACQUISITION of data   TECHNOLOGICAL innovations   FIELD programmable gate arrays  

摘要： The demands from current data acquisition systems are to acquire data from a large number of detectors (or signals) while providing a high throughput. This can be achieved by having some preprocessing capability in the data acquisition system so that it can identify the events of interest. Precise selection of events with minimal time for identification and preprocessing is an experimental challenge. To address this challenge, we have developed a "Global Event-identifier Module" (GEM) on the CAMAC platform, which can flexibly adapt to the experimental requirements and validate an event with minimal time. GEM is a single width CAMAC module capable of operating in a "distributed" data acquisition environment where multiple CAMAC crates (each with one GEM module) can be used to collect synchronized data from all the crates. Event-of-interest decision can be made on signals connected to different crates. Inter-GEM communication is via the ubiquitous ethernet (unshielded twisted pair, CATS) cable. The event of interest is decided within 32 ns (excluding cable delay). Implementation is accomplished using field programmable gate array which enables greater flexibility for algorithm modifications and updates without hardware changes. GEM supports unified, distributed, and multi-strobe data acquisition, enabling higher throughput, with data collection from a large number of signals by selective reads of events of interest as determined by the experimenter while providing timestamped data of each event. (C) 2010 American Institute of Physics. [doi:10.1063/1.3430070]

关键词： Access control   Access protocol   Security   Host identifier   Authentication  

摘要： There have been many security events in the Internet. Many of them are due to arbitrary access permissions to the network resources of the malicious users, especially their free sending packets to anywhere in the network. However, current existing solutions such as ingress filtering and network firewalls cannot solve the problem of malicious access to the network flexibly and effectively. In this paper, we present an efficient access control method based on host identifiers, in which a safe and bidirectional authentication process is introduced whenever the host begins to access the network. Meanwhile, all the succeeding information exchanges between the host and the network can be controlled through the encrypt scheme negotiated during the access authentication process. Through analysis and experiments, we find that the proposed method has the following merits. First, our method has the capability to support various end-nodes to access the Internet in a uniform way. Second, with our method, end-nodes and the core network can establish a mutual trustworthy relationship to avoid any spoof from the other side. Third, our method can support host mobility very well. (C) 2010 Elsevier Ltd. All rights reserved.

关键词： Reed-Solomon codes   Fingerprinting   Traitor Tracing   Traceability codes   Identifiable parent property  

摘要： Codes with traceability properties are used in schemes where the identification of users that illegally redistribute content is required. For any code with traceability properties, the Identifiable Parent Property (c-IPP) seems to be less restrictive than the Traceability (c-TA) property. In this paper, we show that for Reed-Solomon codes both properties are in many cases equivalent. More precisely, we show that for an [n, k, d] Reed-Solomon code, defined over a field that contains the n - d roots of unity, both properties are equivalent. Also, we show how the strategy we propose can be applied to other cases by proving the equivalence of both propertied for a particular code of characteristic 2. This answers a question posted by Silverberg et al. (2001, 2003), for a large family of Reed-Solomon codes. (C) 2010 Elsevier Ltd. All rights reserved.

关键词： 数字信息   中华医学会   发表论文   杂志   object   出版物   国际标准   互联网  

摘要： 数字对象标识符（digital object identifier，DOI）是对包括互联网信息在内的数字信息进行标识的一种工具。在传统的出版物中，书刊、磁带、光盘都有国际标准编号（ISBN、ISSN、ISCN）及其条形码，作为出版物的惟一标识。这些标识使出版物得到有效的管理，便于读者查找和利用。

关键词： 医学杂志   object   数   标注   论文  

摘要： 自2010年第1期开始,《实用医学杂志》全面启用数字对象唯一标识符（digital object identifier,DOI）,即对每一篇刊出的论文都标注DOI。本刊DOI统一标注于论文首页左下角脚注的第1项,标注规则为：doi：10.3969/***。

关键词： IPv6   接口标识符   IP地址   Logistic映射  

摘要： IPv6取代IPv4成为下一代互联网协议的核心已成为必然,这就要求网络运营商研究制定出符合自身网络状况的IP地址分配方案。本文针对淮安网通提出了一种利用Logistic映射生成IP地址的算法,利用该算法生成IPv6地址加大了地址伪造的困难性,将利用该算法生成的IP地址放入DHCP服务器的地址池中,即可对客户进行IP地址的分配。

关键词： 数字信息   2009年   中华医学会   标注   杂志   object   出版物   国际标准  

摘要： 数字对象惟一标识符（digital object identifier，DOI）是对包括互联网信息在内的数字信息进行标识的一种工具。在传统的出版物中，书刊、磁带、光盘都有国际标准编号（ISBN、ISSN、ISCN）及其条形码，作为出版物的惟一标识。这些标识使出版物得到有效的管理，便于读者查找和利用。而网上的文档一旦变更了网址便无从追索。

关键词： 数字信息   2009年   中华医学会   标注   杂志   object   出版物   国际标准  

摘要： 数字对象惟一标识符（digital object identifier，DOI）是对包括互联网信息在内的数字信息进行标识的一种工具。在传统的出版物中，书刊、磁带、光盘都有国际标准编号（ISBN、ISSN、ISCN）及其条形码，作为出版物的惟一标识。这些标识使出版物得到有效的管理，便于读者查找和利用。而网上的文档一旦变更了网址便无从追索。