反馈系数特征的定量研究

从研究串并朕反馈机理出发，得出表达反馈特征的反馈系数与电路参数等量之间的内在关系．同时得出对反馈效果的影响.     

A Web of Learning Opportunities

For at least two decades, politicians, academics and other stakeholders have advocated cooperation across sectors, administrative layers and other institutionalised boundaries to achieve objectives of what are called ‘learning regions’ and the ‘lifelong learning perspective’. Boundaries between geographical, institutional and sectors are becoming more porous. Regions and cities may be seen as complex adaptive systems (CAS), and hence do not necessarily follow the logic of formal institutions. While formal institutions have innate interests in regulating interaction and communication between their members, networks develop according to evolutionary or selectionist dynamics, in that the processes of change can be seen as analogous to natural (Darwinian) selection. Networks may be seen as the architecture of complex systems. Research on networks has been relatively extensive in the last 20 to 30 years in mathematics, sociology, anthropology, and biology. There is an emerging science of networks that studies the structure and function of systems. There is also substantial research on the features in the interconnectedness or interdependencies within the system that contribute to explaining the functionality of that system. In this perspective, we may view a learning region as a web of learning opportunities.     

免电源线安防监控传输系统的设计与制作

主要阐述免电源线安防监控传输系统的设计、制作、样机鉴定与工程使用效果.该系统包括信号电源混合器、同轴电缆、信号能量补偿器、信号电源分离器4个部分,传输中不需要电源线,仅仅使用一根同轴电缆就能同时传输电源、视频、音频和数据信号,节省大量传输材料,降低工程造价和维护成本,缩短施工工期.     

作者科研合作网络模型与实证研究

基于科研论丈作者合作方式，建立一个作者科研合作网络模型。通过理论分析和仿真验证，网络模型节点的度分布（作者合作人数）符合幂率分布，该网络是一种无尺度网络模型。为了说明作者合作网络模型的有效性，对2001年1月至2006年12月期间发表在“图书情报工作》期刊上的科研论文进行统计，建立作者合作网络。对作者合作网络进行数据分析，结果与网络模型结论一致，因此该模型可以很好地描述作者合作网络的演化过程。     

Exploiting Hierarchy in Text Categorization

With the recent dramatic increase in electronic access to documents, text categorization—the task of assigning topics to a given document—has moved to the center of the information sciences and knowledge management. This article uses the structure that is present in the semantic space of topics in order to improve performance in text categorization: according to their meaning, topics can be grouped together into meta-topics, e.g., gold, silver, and copper are all metals. The proposed architecture matches the hierarchical structure of the topic space, as opposed to a flat model that ignores the structure. It accommodates both single and multiple topic assignments for each document. Its probabilistic interpretation allows its predictions to be combined in a principled way with information from other sources. The first level of the architecture predicts the probabilities of the meta-topic groups. This allows the individual models for each topic on the second level to focus on finer discriminations within the group. Evaluating the performance of a two-level implementation on the Reuters-22173 testbed of newswire articles shows the most significant improvement for rare classes.     

应用PB实现图书自动化管理系统C/S与B/S模式的集成

介绍了用PowerBllilder6／6．5实现“图书馆自动化管理系统”C/S模式与B/S模式的集成方案及PB6／6.5实现B,S模式数据库应用的基本原理和方法,阐述了系统的总体结构、基本原理、系统的设置方法及PowerBuilder服务器应用设计的问题。     

关于图书馆传统音像资料的数字化处理

由于传统的音像制作方法、录放设备的发展变化和人们欣赏习惯的改变,音像资料从 模拟转向数字已成必然。这种转换,要经过音视频的数字化处理系统、转录和编辑,以及其数字 化存储等技术处理。数字化过程中必须注重技术操作要点。参考文献8。     

应用人工神经网络实现网络资源评价指标体系的重构

对网络资源评价指标相关文献的内容进行调研，初步拟定指标体系，并通过调查表的方法初步评价该体系。应用人工神经网络软件及统计学方法处理调查表数据，对网络资源评价指标中词频赋权的意义进行研究和分析，实现网络资源一级评价指标体系的重构。     

层次分类诊断模型的多重结构神经网络实现与应用

在层次分类诊断推理理论的基础上,构造出一种多重结构神经网络模型,以降低系统的复杂性,实现系统分层次构造、知识分系统学习和故障全局并行推理。     

利用VPN技术实现合并图书馆分馆互联

VPN 是一种费用较低、安全可靠、切实可行的分馆联网方式。介绍了V PN 技术和V PN 技术在合并图书馆实现分馆互联中的应用。