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.     

分布式认知视角的企业知识生态系统研究

归纳总结国内外关于分布式认知与知识生态系统的研究现状,分析分布式认知理论与知识生态系统的相关性,探讨分布式认知理论对企业知识生态系统的指导作用。     

Web2.0教育教学应用探析

Web2.0改革了传统的学习方式,Web2.0不仅支持协作学习、分布式学习还有利于建立学习共同体。web2.0时代的教育教学对教师和学习者也提出了新的要求。     

分布式认知视角下促进元认知发展研究——基于多媒体环境

分布式认知理论的提出,为研究认知活动提供了全新的视角,也为元认知培养方式提供了新的可能性。分布式认知理论强调媒体的作用,多媒体环境不仅能为外部表征提供多种辅助手段,还能为认知活动提供具体情境。在多媒体环境下,直观的外部表征、可视化的知识交流和实时线索的提供为元认知培养提供了全新的视角。     

School teachers' perception about distributed leadership practices for inclusive education in primary schools in Bangladesh

This article reports on the third phase of a larger study that explored the perceptions of teachers about distributed leadership practices for inclusive education (IE) in primary schools involved in IE reform in Bangladesh. The Distributed Leadership Practice for Inclusive Education scale was developed specifically for this study to collect data. Participants for the present study were head teachers and teachers from 308 public primary schools. The results of this study indicate that teachers perceived that distributed leadership practices for IE were present in primary schools in Bangladesh. The findings indicate that teachers' perceptions about distributed leadership practices for IE have a significant positive correlation with their satisfaction about the implementation of IE policy.     

Teacher appraisal*

At the heart of the teachers' dispute is not money but management . . . This dispute is about resistance to change in working practices. The essence of education is discipline . . . By resisting the discipline of assessment of their own performance, the teachers stand opposed to the renovation of Britain. That is why in this dispute management must win ‐ and there is the beginning and end of the lazy comparison that some people have been tempted to make with the coal strike. (The Times leader, 19 March 1985).

     

一类二阶中立型泛函微分方程的振动性

研究了一类具多个连续偏差变元的二阶中立型微分方程一切解振动的充分条件,所得结论推广了已有的结果.     

中华优秀传统文化网络化传播复合型主体的协同联动

中华优秀传统文化网络化传播复合型主体的形态是多元的,主要包括个体形态、社群形态、社会总体形态和人类总体形态。中华优秀传统文化网络化传播复合型主体的功能是差异协同的,在特定的传受情境中,传播主体处于"核心"地位,信源主体处于"前提"地位,接受主体处于"中心"地位,治理主体处于"领导"地位,影响主体处于"制约"地位。为更好地发挥中华优秀传统文化网络化传播的"以文化人、以文育人"功能,应着重增强"传播主体"的"四力":一要强脚力,在理论思辨与现实考察的统一中深入调研文化融通中的民心相通问题;二要拓眼力,在洞察全局与见微知著的统一中发现筛选文化融通中的民心相通问题;三要活脑力,坚持客观、全面、深刻、发展地思考文化融通中的民心相通问题;四要展笔力,以高度的文化自觉和深厚的家国情怀准确抒写文化融通中的民心相通问题。     

Bond graph models of structured parameter uncertainties

Taking into account uncertainties in model parameter values is a crucial point for studying robustness in modeling and in control. This paper proposes to construct in a systematic and graphical procedure two forms of the linear state equation usually found in the literature for dealing with the robustness problem in the case of structured uncertainties on parameters. It is shown how to model uncertainties in a bond graph approach, in the case of additive or multiplicative parametric variations.