图书资料资产清查建库工作的组织与管理

山东农业大学近期对高校合并后，全校近百年来各个图书馆和院系资料室的所有图书资料进行了数据库建设和资产清查，实现了全部图书资料管理的现代化、规范化、科学化，为今后图书资料的优化配置和资源共享打下了基础。本文介绍了该校在图书资料数据库建设和资产清查中组织与管理工作的做法和措施。     

Retrieving and classifying instances of source code plagiarism

Automatic detection of source code plagiarism is an important research field for both the commercial software industry and within the research community. Existing methods of plagiarism detection primarily involve exhaustive pairwise document comparison, which does not scale well for large software collections. To achieve scalability, we approach the problem from an information retrieval (IR) perspective. We retrieve a ranked list of candidate documents in response to a pseudo-query representation constructed from each source code document in the collection. The challenge in source code document retrieval is that the standard bag-of-words (BoW) representation model for such documents is likely to result in many false positives being retrieved, because of the use of identical programming language specific constructs and keywords. To address this problem, we make use of an abstract syntax tree (AST) representation of the source code documents. While the IR approach is efficient, it is essentially unsupervised in nature. To further improve its effectiveness, we apply a supervised classifier (pre-trained with features extracted from sample plagiarized source code pairs) on the top ranked retrieved documents. We report experiments on the SOCO-2014 dataset comprising 12K Java source files with almost 1M lines of code. Our experiments confirm that the AST based approach produces significantly better retrieval effectiveness than a standard BoW representation, i.e., the AST based approach is able to identify a higher number of plagiarized source code documents at top ranks in response to a query source code document. The supervised classifier, trained on features extracted from sample plagiarized source code pairs, is shown to effectively filter and thus further improve the ranked list of retrieved candidate plagiarized documents.     

Defining'science-based targets'

The 2015 Paris Agreement to keep global warming well below 2℃above pre-industrial levels and aim towards limiting warming to 1.5℃marked a wa-tershed in planetar...     

列宁对马克思意识形态的重构及其历史贡献

马克思认为,意识形态本质上是编造幻想、掩蔽现实关系的精神力量。他把自己创立的学说称作科学,与意识形态相对立。列宁依据时代特征的新变化,不再一般地谈论意识形态的“虚假性”,把马克思主义的社会主义学说称为科学的意识形态,将意识形态概念中性化,深刻认识到无产阶级意识形态和资产阶级意识形态的对立,吸收古今中外思想文化中的合理成分,对无产阶级进行意识形态灌输,努力用无产阶级的意识形态来指导无产阶级的革命斗争,从而开辟了马克思主义意识形态发展的新境界。     

Does the long tail really favor small publishers?

A growing body of literature is devoted to testing the reality of the “long-tail” phenomenon. This literature is mostly, if not exclusively, focused on the impact of Internet on the distribution of sales by product. However, the long tail also raises the issue of a possible change in the usual market structure of cultural industries: an oligopoly with a competitive fringe. To our knowledge, no paper addresses the following question: If the long-tail effect does exist, is it of more benefit to small or dominant publishers? The aim of this paper was to address this issue in the context of the French publishing industry. Our main findings are as follows: (1) the market concentration of the French book industry is lower online than offline and (2) the difference in concentration between the two channels of distribution tended to widen over the period 2004–2010. Strategies adopted by leading publishers on the Web do not allow them to maintain the market share obtained with bricks-and-mortar retailers. Furthermore, we show that the market share lost by dominant firms is captured by small publishers online and by medium-sized publishers in conventional stores.     

大学校长与大学CI战略的实施

CI战略是现代企业管理的先进方法.在大学管理中实施CI战略能增强学校的整体实力,使之成为竞争中的佼佼者.大学校长是战略实施中的倡导者、组织者、策划者.