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关键词： 科技期刊   标识符   中国标准刊号  

摘要： 科技期刊的一些标识符科技期刊的封面除中、英文刊名，出版年、卷、期次外，还有几项以英文字母、阿拉伯数字等和连接符组成的标识符号，它们是中国标准刊号，国际期刊文摘库代码，条形码。为方便作者和读者选择刊物，现择其要；加以介绍；中国标准刊号由国际标准刊号和国...

标准号: AS_NZS 4153.3-1993

关键词： ADAPTIVE SYSTEMS   CONVERGENCE ANALYSIS   IDENTIFICATION   ROBUSTNESS  

摘要： The sign-sign (SS) algorithm is a computationally efficient adaptive identifier, often used in signal Processing tasks. It is obtained by introducing signum functions on both the regressor and the prediction error multiplicands in the update kernel of the well-known LMS algorithm. This paper gives a deterministic persistent excitation condition on the regressor sequence which guarantees SS convergence. It also gives conditions under which SS may diverge, and discusses how these persistent excitation conditions may be verified through a finite amount of computations.

关键词： 数据库   接口设备   SQL语言  

关键词： Algorithms   Storage   Topology  

摘要： An important step in the structural synthesis of mechanisms requires the identification of isomorphism between the graphs which represent the mechanism topology. Previously used methods for identifying graph isomorphism either yield incorrect results for some cases or their algorithms are computationally inefficient for this application. This paper describes a new isomorphism identification method which is well suited for the automated structural synthesis of mechanisms. This method uses a new and compact mathematical representation for a graph, called the Degree Code, to identify graph isomorphism. Isomorphic graphs have identical Degree Codes;nonisomorphic graphs have distinct Degree Codes. Therefore, by examining the Degree Codes of the graphs, graph isomorphism is easily and correctly identified. This Degree Code algorithm is simpler and more efficient than other methods for identifying isomorphism correctly. In addition, the Degree Code can serve as an effective nomenclature and storage system for graphs or mechanisms. Although this identification scheme was developed specifically for the structural synthesis of mechanisms, it can be applied to any area where graph isomorphism is a critical issue.

关键词： 商品标识   应用标识符  

关键词： 微机应用   文献编目   字段   标识符  

摘要： 本文扼要介绍微型机在图书馆文献编目管理中的应用,说明微型机在图书馆编目中的应用将推动图书馆现代化管理建设并对图书情报事业发展产生深远的影响。

关键词： IDENTIFICATION   PARAMETER ESTIMATION   CONVERGENCE ANALYSIS   SELF-TUNING REGULATION   ARMA MODELING  

摘要： A recursive ARMA identifier based on multi-step prediction error minimization is considered so as to sidestep the positive real condition of recursive extended least squares (RELS). For a single step prediction horizon the algorithm reduces to RELS while, as is shown by local convergence analysis, it tends to be a local approximation of the recursive maximum likelihood (RML) algorithm as the prediction horizon increases.

关键词： 机读目录通讯格式   图书馆自动化   连续出版物   书目记录   图书馆业务工作   标识符   标准化   字段代码   述评   规范化  

摘要： 随着图书馆自动化事业的发展,机读目录被广泛地应用于图书馆业务工作,而《中国机读目录通讯格式》(CN—MARC以下简称《机读》)的正式出版,标志着我国机读目录的应用已进入标准化和规范化阶段。《机读》规定了专著、连续出版物的机读形式书目记录的字段标识符、指示符和子字段代码,以及记载在磁带、软盘等载体上的书目记录和它的内容标识符的逻辑和物理形式。该书之所以成为我国编制机读目录的规范,是因为具有以下几个特点: 一、以UNIMARC为基本恢据并结合中国出版物特点是该格式的设计原则之一,即“凡是适用于中国出版物特征的UNIMARC的有关规定均予遵循。对中国出版物特有而UNIMARC中未做规定的,本格式加以补充规定。”因此,《机读》充分吸收了国际MARC格式的研制成果,使其趋于科学与严谨;又结合我国出版物的实际情况,对于我国特有的数据项目。