Metagit: Decentralised metadata management with Git

Version control systems are used widely for tracking edits to data files, especially when working in teams with simultaneous editors. They track who made edits and when, and provide tools for comparing changes made and for resolving conflicts when the same file is edited by two people. Attaching metadata to files which stays with the data and tracking changes can be difficult if the file format does not support it. In this paper we present a new and innovative architecture for recording key-value metadata for objects in a revision control system, specifically Git. The utility and maturity of version control system tools make them a good candidate for a metadata store. We take advantage of Git's data store to permit the values to be blobs, opening up other possibilities such as defining thumbnails for files and folders. Propagation rules are presented, detailing when metadata follows a file after modifications to the repository. A prototype version of a tool is presented and the usefulness of the architecture is demonstrated with a number of examples. Adapting the approach to other systems such as Mercurial and Subversion is also discussed.     

基于DC元数据的印刷企业数字资产元数据研究

为了实现印刷企业数字资产管理系统中数字资产的高效录入和检索,提高数字资产管理系统在印刷企业的使用率和应用水平,本文以DC元数据为基础,结合印刷企业实际生产管理状况,删除DC元数据中的版权等元素,增加印刷企业生产管理元素,首次构建了一套印刷企业数字资产元数据.并邀请印刷企业人员对元数据进行了主观评价,证明这套元数据设置合理,为提高印刷企业数字资产管理系统的适用性提供参考.     

Evaluation and selection of group recommendation strategies for collaborative searching of learning objects

Nowadays, there is a wide variety of e-learning repositories that provide digital resources for education in the form of learning objects. Some of these systems provide recommender systems in order to help users in the search for and selection of the learning objects most appropriate to their individual needs. The search for and recommendation of learning objects are usually viewed as a solitary and individual task. However, a collaborative search can be more effective than an individual search in some situations – for example, when developing a digital course between a group of instructors. The problem of recommending learning objects to a group of users or instructors is much more difficult than the traditional problem of recommending to only one individual. To resolve this problem, this paper proposes a collaborative methodology for searching, selecting, rating and recommending learning objects. Additionally, voting aggregation strategies and meta-learning techniques are used in order to automatically obtain the final ratings without having to reach a consensus between all the instructors. A functional model has been implemented within the DELPHOS hybrid recommender system. Finally, various experiments have been carried out using 50 different groups in order to validate the proposed learning object group recommendation approach.     

数字音频网络IP化的原理及应用(史丽丽约)

首先,本文介绍了数字音频网络IP化的背景,并从网络架构、建设成本以及功能等方面与传统的音频网络进行了对比,体现出IP化之后的网络优势。其次,本文介绍了三个主要的音频网络标准（AES67、Ravenna、Dante）,并通过对音频网络IP化应用场景的介绍,体现出它在后期制作、云制作以及全台音频网络建设当中的巨大优势。最后,指出了未来IP化技术的发展方向。     

一种基于元数据的分布式数据源定位算法

随着Internet和数字图书馆这两种基础信息资源的大量涌现,用户在检索信息之前,如何选择合适的目标站点来提交查询,从而降低查询代价、提高查询效率,已经成为一个重要任务。这个问题更加一般的说法是“数据源定位”或“数据库发现”。元数据是关于数据的数据,数字图书馆中,每个数据文档由其元数据描述,元数据是数字图书馆管理、检索数据以及在各个层面上实现互操作的重要手段。文章提出了一种基于元数据的数据源发现算法,并在召回率、检索精度等方面对这种算法作了评价。     

数字图书馆中XML元数据的存储模式及其优化

1 简介在数字图书馆领域的研究当中,描述性的元数据用来记录实际的馆藏对象的关键特征值。由于很多信息发现的方法并不直接检索实际的馆藏对象,而是检索对象的描述性元数据,因此对于数字图书馆中元数据存储模式的研究,无论从实际应用还是从理论研究方面来看,都具有相当大的实际价值和理论意义。数字图书馆中的元数据通常是以XML文档作为其表现形式,但同时又具有一些鲜明的特点,而元数据的存储与查询子系统的性能直接关系到整个数字图书馆系统的整体性能。迄今为止,国内外的一些相关研究成果已经提供了一些可行     

基于元数据数据库的网络课件搜索系统

现在远程教育正在飞速发展,互联网上的网络课件越来越多。为了便于老师和学生在互联网上找到合适的课件,各种研究机构已经开发出一些搜索技术。但是这些搜索技术还有很多不足之处,搜索的结果会有很多不相关的信息,还有可能遗漏了重要的信息。该文提出了一种基于元数据(metadata)的网络课件搜索系统,从而使搜索结果正确,而且搜索也能够高效率进行。