一种混合搜索算法在智能Web中的应用

一种好的智能搜索算法对智能Web应用是非常重要的。为了在智能Web应用中实现快速智能搜索且能有效地去除垃圾信息,首先介绍了Lucene开源系统,详细分析了Lucene的系统结构以及PageRank算法。按照Lucene的框架规范,将Lucene很好地嵌入到自己的搜索引擎中,利用爬虫从互联网上收集数据,使用目前流行的Lucene和PageRank搜索技术在收集的数据上进行了实例研究。研究表明若在Lucene搜索中添加了PageRank分数,进行混合搜索排序时,相关性高的网页就会排到前面,从而有效提高在智能Web中搜索的准确率及效率。     

基于PageRank的Lucene排序算法优化与实现

随着Web技术的迅速发展,提供个性化服务的搜索引擎技术受到用户的广泛关注,网页排序是其中的关键技术之一。本文利用PageRank算法对原有的Lucene网页排序进行了改进,设计并实现了关于手机信息搜索的个性化搜索引擎。实验结果证明,改进后的排序算法能够较好地提高信息检索的准确度,为用户带来了优于Lucene自身排序的搜索体验。     

Lucene应用中Pdf文档文本数据提取方法研究

基于Lucene的搜索已在各种应用系统中已经得到广泛应用,但是Lucene仅仅提供了全文文本搜索的函数库。本文研究了Pdf文档文本数据的提取方法,其优点在于能快速对Pdf文档文本数据进行提取,得到站内Pdf文档文本数据。     

基于Lucene全文检索引擎的应用研究与实现

Lucene全文检索技术是信息检索领域广泛使用的基本技术.它是一个优秀的开源全文本搜索技术框架.按照Lucene的框架规范,扩展Lucene的功能,可以将Lucene很好地嵌入到自己的搜索引擎中.首先介绍了一个高性能的全文检索引擎--Lucene开源系统,详细分析了Lucene的系统结构,程序运行逻辑,以及在Lucene上的扩展;然后将其引入具体应用,给出了一个基于Lucene全文检索技术的校园网Web搜索引擎的设计与实现.     

基于Lucene的搜索策略研究

对Lucene在搜索和索引中表现出来的特点做了研究,对基于Lucene的搜索策略做了阐述,并结合一个应用案例对搜索策略进行了说明。对于如何在分布式环境下建立强大的搜索引擎进行了探讨。     

基于Lucene的烟草个性化搜索引擎的研究与实现

研究了Lucene搜索引擎框架在烟草行业的信息获取和搜索方面的系统应用。如何在异构的海量数据中获取与烟草行业相关的数据是实现烟草行业信息化管理技术的一个重要分支。通过对不同文件格式的数据处理、烟草行业相关站点的数据抓取、搜索引擎创建和数据检索四个模块框架来实现系统。Web页面基于Heritrix烟草信息数据抓取,其中的非结构化数据或者半结构化数据和不同的文件格式通过Tika工具统一转为为文本,通过Lucene对结构化和非结构化数据创建索引以实现数据检索,由此实现烟草信息搜索引擎系统的实现。     

Web页面排序算法研究

随着Internet的迅猛发展,网络信息呈爆炸式增长。Web信息检索是一个从Web海量数据中检索用户感兴趣信息的综合技术,它从一定程度上满足了用户对信息的需求,但返回页面的数量依然十分巨大。如何对搜索结果进行排序已成为影响搜索质量的一个重要问题。本文介绍了两种页面排序算法PageRank和HITS，并对肉页排序算法的若干改进进行了讨论。     

Web页面排序算法研究

随着Internet的迅猛发展，网络信息呈爆炸式增长。Web信息检索是一个从Web海量数据中检索用户感兴趣信息的综合技术，它从一定程度上满足了用户对信息的需求，但返回页面的数量依然十分巨大。如何对搜索结果进行排序已成为影响搜索质量的一个重要问题。本文介绍了两种页面排序算法PageRank和HITS，并对网页排序算法的若干改进进行了讨论。     

基于APP搜索系统的PageRank改进算法

为了将PageRank算法更好地应用于APP推荐系统,对PageRank算法在APP搜索系统中的应用模型进行研究,发现PageRank算法运用于APP搜索系统中的一种缺点,即同类APP的独立性较弱,相似性较强。因此针对该缺点本文进行算法改进。最后对Time-PageRank算法得到的TPR值与传统PageRank算法的PR值进行了对比,得出Time-PageRank算法在APP搜索系统中可行性的结论。     

一种基于Lucene搜索引擎库的本体映射方法

提出一种基于Lucene搜索引擎库的本体映射方法,该方法利用了Lucene的特点,为源本体建立一个Lucene文档形式的索引,在索引中收集了关于URlrefs的语言信息;然后利用目标本体的URIrefs来作为搜索条件,针时源本体建立的索引进行搜索,从而得到映射.性能分析结果表明,该方法与其他方法相比,在查准率和查全率上有绝对的优势.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

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.     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。     

基于AD9626的模拟信号采集存储卡设计

自然界的绝大部分信号都是以模拟的形式存在,因此模拟信号的采集转换存储在数字时代十分关键。文章讨论了在雷达信号处理领域基于AD9626的AD采集存储卡的设计原理、硬件结构和程序设计与芯片配置等问题,为今后相关领域的研究提供了可参考的方案。     

A human-computer interface for non-computer specialists

The COM teleconferencing system was designed to be easy to use for both beginners and people with much computer experience. A number of design choices in organizing the human-computer interface were considered very carefully. These design problems are not unique for teleconferencing applications, but will appear in many other developments of human-computer interfaces for non-computer specialists. This report discusses naming conventions, menu format, user commands, help facility and the treatment of ‘type ahead’ from the users.     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

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.     

Call for papers Special issue on Modeling and control technologies for civil,energy,and power systems

正The control of civil,energy,and power systems presents significant new challenges for modeling and control theory.The purpose of this special issue is to provide a forum for researchers and practical engineers to discuss the recent advances in modeling and control technology development for civil,energy,and power systems.Prospective authors are invited to submit their original contributions with the focus on theory or applications of modeling,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 and promote academic exchange between Chinese and foreign scientists everywhere.