Fault diagnosis for analog circuits based on chaotic signal excitation     

Hong-Guang Ma  Xiao-Fei Zhu  Ming-Shun Ai  Ji-Dong Wang 《Journal of The Franklin Institute》2007,344(8):1102-1112

A fault diagnosis method for analog circuit is proposed in this paper. An all-purpose amplifier is taken as the typical circuit under test (CUT). The chaotic signal, which is generated by an improved Chua's circuit, is employed as the excitation signal of CUT. The algorithm for phase-space reconstruction of chaotic time series is a combination algorithm of multiple autocorrelation and Γ-test. The circuit state is estimated based on detecting the geometric change of Chua's attractor with a data-mining approach. For the purpose of information fusion, another eight features are extracted from the testing data to comprehensively determine the CUT states. A discussion is made for comparing the effectiveness of each feature according to the testing results.  相似文献   

A citation-based document retrieval system for finding research expertise     

Quan Thanh Tho  S.C. Hui  A.C.M. Fong 《Information processing & management》2007

Current citation-based document retrieval systems generally offer only limited search facilities, such as author search. In order to facilitate more advanced search functions, we have developed a significantly improved system that employs two novel techniques: Context-based Cluster Analysis (CCA) and Context-based Ontology Generation frAmework (COGA). CCA aims to extract relevant information from clusters originally obtained from disparate clustering methods by building relationships between them. The built relationships are then represented as formal context using the Formal Concept Analysis (FCA) technique. COGA aims to generate ontology from clusters relationship built by CCA. By combining these two techniques, we are able to perform ontology learning from a citation database using clustering results. We have implemented the improved system and have demonstrated its use for finding research domain expertise. We have also conducted performance evaluation on the system and the results are encouraging.  相似文献   

基于功能分析的专利技术产业化适用性研究          下载免费PDF全文

刘鑫  余翔 《科研管理》2016,37(11):150-158

本文在梳理概括了国内外专利文本挖掘技术研究进展基础上,探索建立一种基于对专利文本中特定动宾(AO)结构进行挖掘分析的专利功能分析方法,并通过专利功能的定义、提取和分析将专利技术与相关产业进行对接,实现了从专利文本中识别产业化的潜在领域。更为重要的是,本文提出了描述专利技术功能效用的S曲线和S指数,完善和改进了专利技术产业化适用性量化评价模型,并定义了该模型中的S指数、专利功能的绝对重要性指数(AI)和专利功能的相对重要性指数(RI)三个评价指标。最后,以具备"reduce PM2.5"功能的专利为例,验证了基于功能分析的专利技术产业化适用性评价模型的可行性,为中国专利技术产业化路径选择提供了新思路。  相似文献   

图书馆自动化系统更新中数据转换方法探讨   总被引：1，自引：0，他引：1  

李春红  叶丁 《情报科学》2002,20(11):1210-1211

本文阐述了图书馆自动化系统的必要性，并探讨了系统更新中书目数据转换的方法。  相似文献   

美国和欧盟的数据隐私保护策略   总被引：2，自引：0，他引：2  

孙美丽 《情报科学》2004,22(10):1265-1267

Internet用户对数据隐私问题日益关注，对隐私的担忧是用户使用的主要障碍。有效的数据隐私保护对Internet产业的发展极为重要。本文对美国和欧盟的数据隐私保护策略进行了介绍，以期对我国的数据隐私保护起借鉴作用。  相似文献   

Data Mining to Combat Terrorism and the Roots of Privacy Concerns     

Frans?A.?J.?BirrerEmail author 《Ethics and Information Technology》2005,7(4):211-220

Recently, there has been a heavy debate in the US about the government’s use of data mining in its fight against terrorism. Privacy concerns in fact led the Congress to terminate the funding of TIA, a program for advanced information technology to be used in the combat of terrorism. The arguments put forward in this debate, more specifically those found in the main report and minority report by the TAPAC established by the Secretary of Defense to examine the TIA issue, will be analysed to trace the deeper roots of this controversy. This analysis will in turn be used as a test case to examine the adequacy of the usual theoretical frameworks for these kinds of issues, in particular the notion of privacy. Whereas the dominant theoretical framing of the notion of privacy turns around access to information, most of the core arguments in the debate do not fit in this kind of framework. The basic disagreements in the controversy are not about mere access, they involve both access and use. Furthermore, whereas the issue of access by itself refers to a more or less static situation, the real disagreements much more concern the organisational dynamics of the use of information, the mechanisms in the organisation that control these dynamics, and the awareness present within the organisation of the ‘social risks’ these dynamics represent. The bottom line question is whether the assessment of these gives sufficient reason for trust.  相似文献   

图像数据库的研究     

吴泽九 《科技广场》2005,(3):60-62

简述了图像数据库的发展，对图像数据库的结构、分类及其特性进行了研究。并讨论了图像数据库的数据模型。最后给出了图像数据库的检索方法。  相似文献   

促进技术监测在政府科研管理中的应用——纳米技术监测应用研究          下载免费PDF全文

汪雪锋  朱东华  胡望斌 《科研管理》2006,27(3):123-127,134

新形势下提高科研管理质量和效率迫在眉睫。本文提出技术监测方法,即将数据挖掘等计算机前沿技术引入科研管理领域,发展科研管理的数据分析基础,促进了科研管理决策科学化,并在纳米技术领域进行了实证分析。文章最后指出在科研管理领域运用技术监测方法的重要意义。  相似文献   

APRIRIO算法的扩展算法的提出     

吴文兵  杨淑群  聂承启 《科技广场》2005,(8):67-68

进行数据处理的时候，总希望能在繁杂的海量数据中挖掘出有用的信息，因此就有了各种数据挖掘方法的产生，本文介绍一种APRIRIO算法的扩展算法，这种方法能够在众多数据中挖掘出反面规则来，从而得到更清晰的数据概念，方便得出更有用的信息。  相似文献   

基于文本挖掘和技术路线图的技术创新机会发现     

刘兰  赵新力  李艳 《中国软科学》2007,(6):102-105,110

本文在介绍文本挖掘和技术路线图研究情况的基础上，探讨如何将文本挖掘和技术路线图结合起来，通过挖掘隐含在科技信息中的知识和联系，并结合技术领域专家，绘制技术路线图，以帮助技术主管发现技术创新的机会。  相似文献