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关键词： C语言   数据类型   结构  

摘要： C语言一直是高校信息技术专业最重要的课程之一。C语言教学方法的探讨一直以来也是教研领域中的一个热点。针对C语言中赋值运算学生理解、运用能力相对偏弱的问题,本文引入了基于数据类型结构的C语言赋值运算的教学观点,强调计算机底层的处理机制的分析。在此基础上,利用数据类型的一级结构化处理,实现了二级数据类型结构的直接赋值。

关键词： 基于颜色特征的预处理   投影变换   标识符定位   倾斜矫正   标识符分割  

摘要： 集装箱标识符的自动识别对实现电子通关、无人值守有重要作用。然而集装箱图像受环境、拍摄、运动等影响,其标识符的准确定位及分割有一定难度。本文在分析集装箱图像的基础上,设计了一套标识符定位分割方法。本方法首先对集装箱图像进行基于颜色特征的预处理,完成图像的二值化;利用水平投影及字符区域面积、字符个数的限定等,实现噪声区域的剔除和标识符区域的准确定位;采用Radon变换进行倾斜矫正;最后结合水平与垂直投影实现单个标识符的分割。实验结果表明,本文的方法能够很好地实现标识符的快速精确定位和分割,有效解决了复杂背景下准确定位难的问题,为字符的识别打下了良好基础。

关键词： 标准体系建设   国家标准委   物联网   传感器网络   解析系统   网络节点   属性信息   标识符  

摘要： 2017年12月29日,国家标准委发布了五项物联网国家标准,进一步完善了我国物联网标准体系建设,对于指导和促进全国物联网技术、产业、应用的发展具有重要意义。GB/T 30269.502-2017《信息技术传感器网络第502部分：标识：传感节点标识符解析》规定了传感器网络中传感节点标识符的解析,包括节点身份属性信息、应用属性信息、配置信息和感知信息的解析，适用于传感器网络节点标识符解析系统的设计、开发、管理和维护，实施日期：2018年7月1日。

关键词： bioresorbable stents   long lesions   overlap   complex lesions  

摘要： ObjectivesTo compare clinical outcomes of patients treated with overlapping versus non-overlapping Absorb BVS. Background: Limited data are available on the clinical impact of stent overlap with the Absorb BVS bioresorbable stent. Methods: We compared outcomes of patients receiving overlapping or non-overlapping Absorb BVS in the multicenter prospective RAI Registry. Results: Out of 1,505 consecutive patients treated with Absorb BVS, 1,384 were eligible for this analysis. Of these, 377 (27%) were in the overlap group, and 1,007 (73%) in the non-overlap group. The most frequent overlap configuration was the marker-to-marker type (48%), followed by marker-over-marker (46%) and marker-inside-marker (6%) types. Patients of the overlap group had higher prevalence of multivessel disease and higher SYNTAX score, and required more frequently the use of intravascular imaging. At a median follow-up of 368 days, no difference was observed between overlap and non-overlap groups in terms of a device-related composite endpoint (cardiac death, TV-MI, ID-TLR) (5.8% vs. 4.1%, P=0.20) or of a patient-related composite endpoint (any death, any MI, any revascularization) (15.4% vs. 12.5%, P=0.18). Cardiac death (1.0% vs. 1.3%, P=0.54), MI (4.5% vs. 3.6%, P=0.51), TVR (4.5% vs. 3.6%, P=0.51) and stent thrombosis (1.1 vs. 1.5%, P=1.00) were also comparable between groups. When assessing outcomes of the overlap population according to overlap configurations used, no difference was observed in terms of the device- or patient-related composite endpoints. Conclusions: Outcomes of patients with or without overlapping BVS were comparable at mid-term follow-up despite higher angiographic complexity of the overlap subset. (c) 2017 Wiley Periodicals, Inc.

关键词： 数字信息   中华医学会   标注   杂志   出版物   国际标准   互联网   条形码  

摘要： 数字对象唯一标识符（digitalobjectidentifier，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。

关键词： ISTC   文本编码   标识符   作品   标准  

摘要： 国际标准文本编码(ISTC)的目的是为文本作品提供一个有效的识别系统,使得文本作品信息能够在本地以及国际层面上,在作者、代理商、版权管理者、出版商以及出版供应链中的其他角色之间进行有效表达。这给数字时代的出版业提供了一个很好的数字内容识别管理工具。成功地制定一项国际标准并非易事。然而,自2009年ISO发布该标准后,其遭遇了注册量下滑,注册代理中心停止运营,国际注册管理机构董事会成员退出,标准目前面临废止的窘境。本文从该国际标准的产生背景、内容,发展情况与问题,以及目前正在展开的修订工作着手,探索了该标准的可能应用前景和发展方向。

关键词： 数字信息   标注   object   出版物   国际标准   条形码   互联网  

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。

关键词： 规范控制   标目   标识符   实体管理  

摘要： 图书馆目录长期以来采用描述与检索点分离的处理方式,规范控制依赖于选择一个规范名称,这种方式在去中心化的互联网时代已经不再适合。2010年以来的标准研发成果如《IFLA图书馆参考模型》、书目框架、《资源描述与检索》修订及MARC21格式更新等,规范控制以代表实体的标识符取代名称的规范形式,即实体或身份管理的发展趋势十分明显。

关键词： Human scent evidence   Reliability mantrailing   Mantrailer   Forensic science   DNA  

摘要： Specially trained dogs have long been used by law enforcement agencies to help in criminal investigations and in searching for missing persons. Still, it is unclear which components of human scent released into the environment contribute to successful searches of individuals. In this study, saliva and axillary sweat samples were taken from a total of 190 people. Additionally, DNA was extracted from whole blood of seven different people and used as an odour sample as well. Overall 675 tests (trails) were performed during a period of 18 months. The ability to track individuals with the odour samples mentioned above was examined with seven dogs, four of which were specially-trained dogs (mantrailer) from the Saxony Police. Results indicated that specially-trained police dogs can track a person with an average success rate of 82% and correctly identify the absence of an odour track with an average success rate of 97% under various conditions. Private rescue dogs were less successful with an average success rate of 65% and 75% respectively. These data suggest that the potential error rate of a well-trained handler team is low and can be a useful tool for law enforcement personnel. Saliva, as a reference odour source, was found to be particularly suitable for the search. The results of the study suggest that the components contained in axillary sweat, saliva and DNA extracted from whole blood are sufficient, serving as a key stimulus for individualized searches. (c) 2017 Elsevier B.V. All rights reserved.

关键词： 20F16   20J06   03G05   20F65  

摘要： Let G be a polycyclic, metabelian or soluble of type (FP)(infinity) group such that the class Rat(G) of all rational subsets of G is a Boolean algebra. Then, G is virtually abelian. Every soluble biautomatic group is virtually abelian.