区块链视域下公共图书馆数字版权交易平衡策略研究

为科学规制公共图书馆参与数字出版过程中长期存在的供需地位失衡、博弈机制失衡、版权流转失衡等矛盾,本文以区块链中的分布存储、共识机制、智能合约3类核心技术为基础,分析了旨在动态平衡公共图书馆参与数字出版版权利益博弈的可行思路,同时结合区块链各层级结构特点提出面向促进资源供需节点间地位平衡、达到版权收益帕累托最优、提高数字版权交易可靠性的实践策略,以期为公共图书馆参与数字出版过程中及时遏制侵权行为、保障版权交易利益相关者权益提供参考。     

基于 Petri 网的分布式协同办公智能模 型简

介绍了Petri网的基本理论,分析了基于网络服务的分布式协同办公应用的特征,在此基础上提出了基于Petri网的分布式协同办公的通用智能模型,该模型具有语义明确、易于修改,并且易于验证的优点,最后以文档审批工作流为例给出了具体的模型实现过程．     

阿里巴巴并购新浪微博的动因分析——基于交易成本的视角

阿里巴巴并购新浪微博意味着网购平台和社交平台将实现深度融合,是对一种新的电子商务模式的探索。研究阿里巴巴并购新浪微博既能指导电商网站并购,又能对新的电商模式进行理论构建。阿里巴巴并购新浪微博的内在动因是降低交易成本,通过比较分析其边界扩展的三种可选组织形式的交易成本,证明了阿里巴巴并购新浪微博是其扩展边界所花费交易成本最低的组织形式。     

Distributed leadership with the aim of ‘reculturing’: a departmental case study

This article considers a secondary science department that has, since 2000, developed distributed leadership as a form of human capacity building. Using a longitudinal ethnographic case study allowed us to consider how distributed leadership can be nurtured and developed in a department. Our analysis centres on two key issues: the nature and pattern of distributed leadership practices and the continuity that provides coherence to those practices. From our analysis, there appear to be two major conclusions. The first of these is the need for administrators to be purposeful in the appointments that they make to formal leadership positions. To enact distributed leadership practices requires leaders who can exercise both formal power and influence. The second conclusion relates to the time required for continuity of leadership practices to give rise to changes that lead to teachers managing the teaching and learning programme.     

Interrogating conceptions of leadership: school principals,policy and paradox

Currently educational research literature demonstrates wide discussion and endorsement of ‘distributed’ leadership while concurrently traditional, hegemonic forms prevail in practice. This article investigates understandings about educational leadership held by Australian school principals. The article describes the contradictory conceptions about educational leadership currently in circulation. It interrogates underlying assumptions and questions how both hegemonic and newer leadership conceptions and assumptions serve educational leaders. Data from principals around the country and across education systems reinforced the predominance of un-theorised or under-theorised notions about leadership, with similar assumptions found in important policy artefacts and practices. This article emerges from interviews with 100 principals focusing on their professional learning needs, which revealed interesting ideas, issues and dilemmas concerning ‘leadership’. It fills a gap in research on distributed leadership by exploring contradictions inherent in policy, practice and understandings in this area. The article is structured into four sections. First, extant literature on this topic and the research are explained. Second, the article focuses on principals' conceptions about leadership and those inherent within important policy and practical artefacts. A discussion of the findings focuses on the discrepancy between theory and policy endorsement and the views of practitioners. Finally, the article canvasses the implications of the research.     

点电荷在导体球壳内任意位置时电势的分布

详细讨论了点电荷在导体球壳内任意位置时,导体球壳所处空间电势、球壳内壁感应电荷的分布。     

网格计算

网格计算是利用网络中一些闲置的处理能力来解决复杂问题的计算模式。     

基于J2EE架构的事务管理应用研究

描述了基于J2EE架构的事务管理在项目中的应用,研究了J2EE项目中使用事务的方法,分布式环境中的事务处理及两阶段提交方法实现,分析总结了事务应用中应遵循的习惯.     

Mobile Agents for Distributed and Heterogeneous Information Retrieval

The heterogeneous, distributed and voluminous nature of many government and corporate data sources impose severe constraints on meeting the diverse requirements of users who analyze the data. Additionally, communication bandwidth limitations, time constraints, and multiple data formats impose further restrictions on users of these distributed data sources. In this paper, we present an Agent-based Complex QUerying and Information Retrieval Engine (ACQUIRE) for large, heterogeneous, and distributed data sources. ACQUIRE acts as a softbot or interface agent by presenting users with a view of a single, unified, homogenous data source, against which users can pose high-level declarative queries. ACQUIRE translates each such user query into a set of sub-queries by employing a combination of planning and traditional database query optimization techniques. ACQUIRE then spawns a set of mobile agents corresponding to these sub-queries, which in turn retrieve the data from various distributed data sources by dynamically optimizing the retrieval strategy as it is carried out. These mobile agents carry with them data-processing code that can be executed at the remote site, thus reducing the size of data returned by the agent. When all mobile agents have returned, ACQUIRE filters and merges the retrieved data and presents the results to the user. While the system is still very much a work in progress, current validation experiments on simulated NASA Distributed Active Archive Centers (DAACs) have demonstrated that complex queries can be effectively decomposed and retrieved by this approach.     

股改前后关联交易影响因素研究——基于公司治理的视角

文章利用上市公司2005—2009年的数据,实证检验了股改前后关联交易影响因素的变化情况。结果表明,股改后的股权结构和董事会特征均发生了一些变化,但这些因素对上市公司与控股股东之间关联交易的影响变化不大。股改前后,第一大股东的持股比例、股权集中度及第一大股东派出董事比例与关联交易发生额呈显著的正相关关系;审计委员会的设置对关联交易可以起到监督作用;股改后独立董事对关联交易的监督作用有所增强;其他大股东并未随着其力量的相对增强而对控股股东起到监督作用。