基于深度学习挖掘用户搜索主题研究

主要研究了基于深度学习技术挖掘用户搜索主题相关的感兴趣内容。通过深度挖掘算法分析用户搜索记录、查询历史以及用户感兴趣的相关文档视为用户搜索主题数据的来源,进而挖掘兴趣主题。挖掘模型主要采用向量空间模型,将用户搜索主题模型表示成用户搜索主题向量形式。形成主题和用户兴趣关系网,用户搜索主题向量的构造过程:选择一组用户查询词,并对它们进行深度挖掘分类,最后用它们构造用户搜索主题特征向量,进而分析用户兴趣点。结合用户随着时间的变化,以及过程中有不用的搜索词,以及无关的搜索噪声词去掉,调整兴趣度,用户搜索主题需要具有更新学习机制,动态跟踪了用户兴趣变化趋势。该用户搜索主题研究过程克服了数据稀疏、类别偏差、扩展性差等缺点。实验结果表明,该模型识别用户搜索主题准确率良好。     

基于本体用户兴趣模型的个性化推荐系统

针对传统个性化推荐系统用户兴趣模型创建和更新的不足,无法准确地感知用户特定背景下的语义信息和用户兴趣随着时间的变化,基于用户兴趣本体提出一种新用户兴趣模型,并通过激活扩展理论描述该用户兴趣模型的更新算法。同时,改进了推荐算法,结合协同过滤进行个性化推荐。实验结果表明,该模型能够有效反映用户兴趣,新的推荐算法在MEA、多样性、冷启动处理、稳定性方面都具备很高的性能。     

基于搜索结果的Web预取模型研究

目前搜索引擎返回的信息太多且难以根据用户的兴趣提供检索结果,而个性化推荐是一种旨在减轻用户在信息检索方面负担的有效方法.文中把内容过滤技术和文档聚类技术相结合,以改进的STC聚类方法组织搜索结果,主动推荐用户感兴趣的文档并将其中的Top-N对象预取到本地. WWW缓存中的Web文档代表了用户当前的兴趣,通过建立用户概率兴趣模型,在搜索结果STC聚类的基础上进行内容过滤.实验表明,基于搜索结果的Web预取模型具有较好的时间性能和较高的查准率.     

基于用户长短期偏好及时空场景的下一个兴趣点推荐

在现实生活中,用户对兴趣点的偏好会受到时空场景的影响,用户希望获得匹配当前时间的推荐结果。由此,提出基于用户长短期偏好及时空场景的下一个兴趣点推荐模型。该模型围绕实时兴趣点推荐这一问题,从用户的长短期偏好两方面来挖掘用户的实时兴趣偏好。对于长期偏好,从历史数据中收集与当前时空场景最相关的信息。对于短期偏好,在序列影响的基础上考虑时间推移影响。在公开数据集上的实验结果证明了方法的有效性。     

一种考虑用户行为的改进N-PageRank算法

针对Google PageRank算法中存在的“平均分配原则”及网络链接结构所造成的“旧网页问题”、“主题漂移问题”,提出一种改进的网页排序算法N-PageRank.该算法通过对搜索日志进行数据挖掘,捕捉用户与搜索引擎之间的交互过程,发现隐藏在用户搜索行为背后的用户兴趣和搜索规律,利用用户行为反馈模型,分析网络日志里用户的各项行为特点,改善了排序结果的准确率,保证了搜索引擎的返回结果正是用户所希望看到的网页.实验证明该算法有效地降低了网页排序时的客观因素的影响,充分考虑了用户对于网页质量的评价,所得到的排序结果更加能够满足用户的需求.     

基于跨系统的个性化搜索系统模型设计

用户模型的建立和动态更新,是实现个性化搜索的基础和核心。通过采用Multi-Agent技术对跨系统的个性化搜索系统进行设计,采用交互式Agent初始化单系统用户模型,使用动态跟踪用户兴趣Agent和历史记录检索Agent来更新用户模型,并利用SUM模型建立跨系统的用户模型。最后利用产生的用户兴趣文件作为查询优化Agent和结果优化Agent的判别依据来提高跨系统搜索的个性化。     

基于简化ODP的用户兴趣模型

通过搜集搜索引擎用户的个人兴趣偏好,个性化搜索技术能够对搜索结果中的页面进行分析并与用户的兴趣进行比较,帮助用户从中找出更为感兴趣的结果,从而提高用户的搜索效率。通过利用简化的ODP目录层次结构进行训练以建立基本的用户兴趣树型结构,并在模型使用过程中通过用户的隐式操作反馈,对用户兴趣模型进行动态更新以反映用户不断变化的兴趣偏好。这一用户兴趣建模方法以简化的ODP结构为参考框架,并以用户个人的搜索行为作为模型修正和更新的依据,实现消除词条歧义并且表达用户个人兴趣偏好的目的。     

基于隐式反馈的用户兴趣漂移方法

针对现有用户兴趣模型在模型建立以及更新阶段漂移策略的缺陷,设计了一种改进的基于隐式反馈的用户兴趣漂移方法.将用户兴趣分为长期兴趣和短期兴趣,对短期兴趣采用滑动窗口处理更新,对长期兴趣采用最近最少使用淘汰算法,并将该模型与遗忘策略模型、滑动时间窗口模型做了精确率的对比实验,实验结果显示该模型的性能优于其它三个模型.     

基于用户兴趣的FP-TREE算法的改进及应用

关联规则主要通过历史数据来找出某些隐性的规律,但是针对不同用户,不同的规则更为有效,因此如何找出比较有价值的规则引起了人们的广泛关注。提出一种基于用户兴趣模型的改进关联规则算法,该算法从用户分类的角度找到适合不同用户的不同规则。通过在学校教学评估中的应用,验证了算法的有效性。     

个性化搜索引擎中用户兴趣模型的构建方法

在分析个性化搜索引擎的基础上,提出一种构建用户兴趣模型的方法.该方法综合考虑用户注册兴趣及浏览行为,将用户兴趣分为长期兴趣和短期兴趣并通过兴趣树进行存储.遗忘机制的引入保证模型能够及时准确地反映用户兴趣.模拟实验表明,本文提出的用户兴趣模型能够有效地提高检索效率,使搜索结果更好地满足用户个性化需求.     

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.     

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.     

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.     

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.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

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