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关键词： 标识符   信息技术   DOI   数字对象唯一标识   Object   规范化管理   唯一性   互联网  

摘要： DOI,即数字对象唯一标识,为英文Digital Object Identification的缩写。根据国际标准ISO 26324里的解释,它的意思是“一个对象的数字标识符”。这个标识符具有唯一性、永久性的特点。DOI是规范化管理、组织、共享、利用数字资源的有效工具。随着信息技术和互联网的发展,DOI目前已在国际出版界得到广泛推广应用。

关键词： 条形码   数字信息   数字对象唯一标识符   网址   互联网信息   DOI   唯一标识   信息标注  

摘要： 数字对象唯一标识符(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T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,作为出版物的唯一标识。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。数字信息标注DOI如同出版物的条形码,是一个永久和唯一的标识号。

关键词： Output regulation   Adaptive output regulation   Identification for control  

摘要： In Marconi et al. (2007), the theory of nonlinear Luenberger observers was exploited to prove that a solution to the asymptotic output regulation problem for minimum-phase normal forms always exists. The paper provided an existence result and a very general regulator structure, although unfortunately, no constructive method was given to design all the degrees of freedom of the regulator. In this paper, we complete this design by introducing an adaptive unit tuning the regulator online by employing system identification algorithms selecting the "best"parameters according to a certain optimization policy. Instead of focusing on a single identification scheme, we give general conditions under which an algorithm may be used in the framework, and we develop a particular least-squares identifier satisfying these requirements. Closed-loop stability results are given, and it is shown that the asymptotic regulation error is related to the prediction capabilities of the identifier evaluated along the ideal error-zeroing steady-state trajectories. (c) 2020 Elsevier Ltd. All rights reserved.

关键词： Information centric networks   DDoS   Packet logging   Path identifiers   Network security  

摘要： Information Centric Networks (ICNs) have emerged in recent years as a new networking paradigm for the next-generation Internet. The primary goal of these networks is to provide effective mechanisms for content distribution and retrieval based on in-network content caching. Several network architectures were proposed in recent years to realize this communication model. This include Named Data Networks (NDN) and Path-Identifier (PID) based ICN. This paper proposes LogDoS as a novel mechanism to address the problem of data flooding attacks in PID-based ICNs. The proposed LogDoS mechanism is a unique hybrid approach that combines the best of NDN networks and PID-based ICNs, and it is the first to employ Bloom-filter based logging approach in a novel way to filter attack traffic efficiently. In this context, we develop and model three versions of LogDoS with varying levels of storage overhead at LogDoS-enabled routers. Extensive simulation experiments show that LogDoS is very effective against DDoS attacks as it can filter more than 99.98% of attack traffic in different attack scenarios while incurring acceptable storage overhead. (C) 2020 Elsevier Ltd. All rights reserved.

关键词： Program comprehension   Identifier naming   Software maintenance   Source code analysis   Part-of-speech tagging  

摘要： Identifiers make up a majority of the text in code. They are one of the most basic mediums through which developers describe the code they create and understand the code that others create. Therefore, understanding the patterns latent in identifier naming practices and how accurately we are able to automatically model these patterns is vital if researchers are to support developers and automated analysis approaches in comprehending and creating identifiers correctly and optimally. This paper investigates identifiers by studying sequences of part-of-speech annotations, referred to as grammar patterns. This work advances our understanding of these patterns and our ability to model them by (1) establishing common naming patterns in different types of identifiers, such as class and attribute names;(2) analyzing how different patterns influence comprehension;and (3) studying the accuracy of state-of-the-art techniques for part-of-speech annotations, which are vital in automatically modeling identifier naming patterns, in order to establish their limits and paths toward improvement. To do this, we manually annotate a dataset of 1,335 identifiers from 20 open-source systems and use this dataset to study naming patterns, semantics, and tagger accuracy. (C) 2020 Elsevier Inc. All rights reserved.

标准号: T/CHIA 17.5-2020

关键词： 分布式管理   DOI   条形码   数字信息   数字对象   物理地址   学术信息   识别码  

摘要： 数字对象唯一标识符(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,作为出版物的唯一标识。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。数字信息标注DOI如同出版物的条形码,是一个永久和唯一的标识号。随着时间推移,数字对象的某些有关信息可能会有变化(包括存储的物理位置),而DOI可让使用者直接由此链接到出版商的数据库、文献、摘要甚至是全文,识别码可以直接指引到出版物的本身,使国内外各种来源、不同物理地址的各种类型的学术信息实现互链互通。DOI是一个可供全球期刊快速链接的管理系统,整个系统由国际DOI基金会(IDF)进行全球分布式管理。

关键词： 数字信息   条形码   数字对象唯一标识符   网址   互联网信息   唯一标识   有效的管理  

摘要： 数字对象唯一标识符(digital object identifier,D0I)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,作为出版物的唯一标识。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： 数字对象   标注规则   网络链接   文献类型   杂志内容   标识符   网络传播权   资源数字化  

摘要： 根据中华医学会杂志社有关通知要求,为更好的提升杂志内容资源数字化传播效能,保护数字资源在网络链接中的知识产权和网络传播权,实现对数字对象的持续追踪和阅读数据的有效统计,自2020年(第38卷)3期,我刊DOI号标注规则进行修订。DOI标注规则:统一前缀/学会标识.文献类型.CN号-稿号,其中统一前缀(10.3760)学会标识(cma)/文献类型(j)不变;cn+cn号6位数字(我刊为121094)+收稿年月日(8位)+流水码(5位)。

关键词： Cell wall lytic enzymes   Bioinformatics   Machine learning-based identifier   Support vector machine   Improved MRMD feature selection method  

摘要： Cell wall lytic enzymes play key roles in biochemical, morphological, genetic research and industry fields. To save time and labor costs, bioinformatic methods are usually adopted to narrow the scope of in vitro experimentation. In this paper, we established a novel machine learning (support vector machine) based identifier called CWLy-pred to identify cell wall lytic enzymes. An improved MRMD feature selection method is also proposed to select the optimal training set to avoid data redundancy. CWLy-pred obtains an accuracy of 93.067%, a sensitivity of 85.3%, a specificity of 94.8%, an MCC of 0.775 and an AUC of 0.900. It outperforms the state-of-the-art identifier in terms of accuracy, sensitivity, specificity and MCC. Our proposed model is based on a feature set of only 6 dimensions;therefore, it not only can overcome overfitting problems but can also supervise biological experiments effectively.