关联规则的开采与更新

对关联规则的增量式更新算法——IUA(incremental updating algorithm)进行了分析,指出其存在的问题,并给出一个改进的算法NEWIUA(new IUA).NEWIUA算法对已存在的和本次更新时新产生的频繁项目集都加以充分的利用,因此,在保证算法有效的同时提高了效率.文章提出了3种关联规则开采的并行算法,并对各算法进行了分析和讨论.     

关联规则的开采与更新S

对关联规则的增量式更新算法--IUA(incremental updating algorithm)进行了分析,指出其存在的问题,并给出一个改进的算法NEWIUA(new IUA).NEWIUA算法对已存在的和本次更新时新产生的频繁项目集都加以充分的利用,因此,在保证算法有效的同时提高了效率.文章提出了3种关联规则开采的并行算法,并对各算法进行了分析和讨论.     

基于动态分组的增量式挖掘关联规则更新算法

数据挖掘的一个重要方面是挖掘关联规则，目前已提出了包括经典算法Apriori在内的许多算法，而在实际关联规则的挖掘过程中，用户将需要不断调整用于描述用户兴趣程度的阈值：最小支持度和最小置信度。如何维护已发现的关联规则变得至关重要。该文提出的GIUA算法解决了在数据库D不变的情况下，最小支持度和最小置信度发生变化时关联规则的维护问题，最大效率地利用原有结果，通过动态分组将连接步和修剪步的循环减到最少，并尽可能地将挖掘过程并行化。     

改进型关联规则增量式更新算法与实现

关联规则是数据挖掘中的重要研究内容之一。目前,已经提出了许多算法用于高效的发现大规模数据库中的关联规则,但是对关联规则的维护问题的研究工作却很少。本文对在事务数据库不变,只对最小支持度和最小可信度进行改变的情况下,如何进行关联规则的维护问题进行了探讨,并提出了一种高效的增量式更新算法。     

一种新的基于FP-Tree的关联规则增量式更新算法

挖掘关联规则是数据挖掘研究的一个重要方面,目前已经提出了许多算法用于高效地发现大规模数据库中的关联规则,而维护已发现的关联规则同样是重要的.针对在事务数据库增加和最小支持度同时发生变化的情况下,如何进行关联规则的更新问题进行了研究,提出了一种新的基于频繁模式树的关联规则增量式更新算法,并对该算法进行了分析和讨论.     

适合于高效更新的关联规则挖掘算法

实用的关联规则挖掘算法，为了发现事先未知的关联规则，用户需要通过对最小支持度和最小可信度这两个阈值的不断调整来逐步聚焦到那些真正令其感兴趣的关联规则上去，这将是一个动态的交互过程，因此，迫切需要高效的更新算法来满足用户对较快的响应时间的需求，基于这种思想，并深入分析了已有的诸关联规则挖掘与更新算法且指出其共同存在的问题与不足，在此基础上，提出一种当数据库数据不变时，仅扫描数据库一次，即可反复调整最小支持度和最小可信度进行关联规则挖掘与更新的高效、实用的算法，特别在对关联规则进行更新时，该算法对最初和前次挖掘过程中所得到的信息加以充分的利用，从而对关联规则进行更新时算法的执行效率得到进一步的提高，并对算法进行了分析与讨论．     

改进的增量式关联规则维护算法

挖掘关联规则是数据挖掘研究的一个重要方面，而维护已发现的关联规则同样是重要的。在分析现有的关联规则算法IUA的基础上，指出了该算法的不足和错误之处，并加以改正，进而提出了一种改进的增量式更新算法EIUA。EIUA算法解决了在数据库D不变的情况下，当最小支持度和最小置信度二阈值发生变化时如何高效更新关联规则的问题。实验分析表明了新算法的有效性和优越性。     

高效的关联规则挖掘算法研究

目前已经提出了许多用于高效地发现大规模数据库中的关联规则的算法,但都是对关联规则中满足最小支持度的频繁项集的研究,没有对频繁项集中如何高效地计算得到满足最小置信度的关联规则进行研究.针对这种情况,提出了一种高效关联规则的挖掘算法EA,解决了在挖掘关联规则过程中如何高效挖掘满足最小置信度的关联规则问题.     

负增量式关联规则更新算法

模式维护是数据挖掘中一个具有挑战性的任务.现有的增量式关联规则更新算法主要解决两种情况下的维护问题：一是最小支持度不变,而数据量增加;二是数据量不变,而改变最小支持度.本文提出了一种负增量关联规则更新算法.实验表明,该算法是有效的.     

数据开采机模型及开采算法研究

本文在介绍数据开采基本知识的基础上提出了一个通用的开采机模型，并对其各模块的功能做出描述，针对目前许多开采大型数据库中的关联规则高效算法大多是在各自单独的领域内进行算法的理论研究与探讨的问题，本文在研究了两种高效的关联规则开采算法：最大频繁项目集算法FID（Frequent Itemsets Discovery），增量式更新算法IUA（Incremental Updating Algorithm）后，将以上算法综合并在计算机上实现，作为比较同时给出了Aprioiri（经典的关联规则开采算法）的实现。文中为了避免负面示例的问题，还引入了兴趣工的概念，并在系统中实现。     

Call for Papers The 6^th International Conference on Grid and Cooperative Computing

Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

法律信息库系统

本文分析了法律数据库的结构和特点，介绍了采用面向对象设计方法和超文本数据库技术开发和实现法律信息库系统将作为重要网络资源之一为不同用户进行法律咨询服务。     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

International Journal of Automation and Computing Table of Contents

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Information for authors

正SCIENCE CHINA Information Sciences(Sci China Inf Sci),cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China,and published by Science China Press,is committed to publishing highquality,original results of both basic and applied research in all areas of information sciences,including computer science and technology;systems science,control science and engineering(published in Issues with odd numbers);information and communication engineering;electronic science and technology(published in Issues with even numbers).Sci China Inf Sci is published monthly in both print and electronic forms.It is indexed by Academic OneFile,Astrophysics Data System(ADS),CSA,Cabells,Current Contents/Engineering,Computing and Technology,DBLP,Digital Mathematics Registry,Earthquake Engineering Abstracts,Engineering Index,Engineered Materials Abstracts,Gale,Google,INSPEC,Journal Citation Reports/Science Edition,Mathematical Reviews,OCLC,ProQuest,SCOPUS,Science Citation Index Expanded,Summon by Serial Solutions,VINITI,Zentralblatt MATH.     

Erratum to: Fast global kernel fuzzy c-means clustering algorithm for consonant/vowel segmentation of speech signal

正Erratum to:J Zhejiang Univ-Sci C(ComputElectron)2014 15(7):551-563doi:10.1631/jzus.C1300320The original version of this article unfortunately contained mistakes.Algorithm 6 should be as follows:Algorithm 6 FGKFCM-F clustering Input:(1)X={x_1,x_2,…,x_N},,x_iR~d,i=1,2,…,N,the dataset;(2)C,1C≤N,the number of clusters;(3)ε0,the stopping criterion;     

Journal of Zhejiang University-SCIENCE C (Computers & Electronics) Total contents

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A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.