一种面向领域文档的结构化检索模型及其在农技处方检索中的应用

各种专业领域中的文档往往具有显著的结构化特征,即一篇文档往往是由具有不同表达功能的相对固定的多个文本字段构成,同时这些字段蕴含了相关的领域知识。针对专业文档的结构化和领域化特征,设计了一种面向结构化领域文档的信息检索模型。在该模型中,首先对领域文档集进行挖掘以构建能够反映领域知识的结构化模型,之后以此为基础设计了结构化文档检索算法来为用户查询返回相关的领域文档。选择一类典型的领域文档——农技处方开展了应用研究,利用一份现实的农技处方文档数据集将提出的方法与传统的信息检索方法进行了实验对比分析,并开发了农技处方检索原型系统。     

利用Java Swing实现数据库结构化查询界面

介绍了一种用Java Swing编程为实现数据库结构化查询界面的方法,其中重点讨论了树（JTree)、选项卡（JTabbledPanel)和表（Table)的应用。     

图像数据的结构化协同标注与检索

通过分析图像数据对语义信息的检索需求,提出一种表达图像信息的结构化方法,并定义一种根据图像中隐含语义信息来判定相似度的算法。该方法在一定程度上克服了基于内容的图像检索和基于文本的元数据图像检索这2种常用图像检索方法缺乏语义信息匹配上的不足。原型系统根据结构化协同标注中语义信息的丰富程度与图像检索的精确程度,证明了该方法的有效性。     

基于内容的多媒体数据查询和检索

多媒体数据具有可表现的视觉和听觉特性，而难于用符号形式来描述。本文介绍基于内容的对多媒体数据进行查询和检索的概念和方法，描述查询和检索的一般系统结构、用户查询类型、索引／过滤机制，以及视频的检索和浏览，并给出基于内容检索研究中值得探索的几个主要问题。     

基于贝叶斯网络的结构化文档检索模型

研究表明合理考虑术语之间的关系可以提高检索系统的性能。采用共现分析的方法从文档集合中学习得到术语之间的关系;并应用到结构化文档检索中;提出了一个基于贝叶斯网络的结构化文档检索模型;给出了其拓扑结构、概率估计以及推理过程。实验表明该模型的检索性能要优于没有考虑术语之间关系的模型。     

半结构化数据模型及查询语言

在传统数据库中要求查询处理时数据的结构模式已知且固定。这在ＷＷＷ和异构信息源集成等半结构化数据情形下很难满足。     

数据网格环境下的多媒体资源检索

提出一种数据网格环境下的多媒体资源检索方法。通过设计分层结构的虚拟资源空间管理非结构化异构资源,当网格查询节点收到检索请求时,根据虚拟集和元数据等信息进行信息过滤,得到候选集及相应的结构化特征和语义标注,执行节点对候选集进行相似度求精和排序运算,并将排序结果返回查询节点。仿真结果表明,该方法具有较好的时间性能和较高的查准率。     

结构化查询语言讲解

结构化查询语言SQL是一种介于关系代数和关系演算之间的数据操纵语言，是关系数据库数据操纵语言事实上的标准。本讲在概述部分，分析了SQL语言对关系数据库三级模式的支持，并对SQL的特点进行了细致的分析。     

对象代理数据库跨类查询与代理对象查询的索引结构分析

数据库技术的发展促使其在不同领域得到了广泛的应用。包括数字图书馆等在内的一些新的应用领域对数据库的应用提出了更高的要求。而在这些新的应用领域中,多会涉及到一些复杂的、非传统形式的数据。而对象代理数据库能较好地支持各种非传统形式的数据类型,可以对各种复杂的数据类型实施有效的管理,而且对象代理数据库引入的对象代理数据库跨类查询与代理对象查询的索引结构,现在提高了数据库跨类查询的效率。该文主要从对象代理数据库跨类查询索引结构的设计、对象代理数据库跨类查询索引机制的实现以及一种基于代理对象查询机制索引结构的说明这三个方面来对对象代理数据库跨类查询与代理对象查询的索引结构作详细的分析。     

构造Web文档中半结构化信息的技术

为了对Ｗｅｂ上不规则的、动态的信息按照数据库的方式集成和查询,采用对象交换模型（ＯＥＭ）建立了Ｗｅｂ上信息模型。为了将页面中各个部分表示为应用的ＯＥＭ对象,设计了半结构化信息的抽取算法,并给出测试结果。该方法可以抽取结构化和半结构化的信息,比现有的抽取方法通用性更强。     

协同多媒体菱工具中演示文档的同步模型

多媒体演示文档的协同菱对文档本身的结构与同步模型提出了一定的要求。为了便于面向对象的实现以及灵活多粒度的共享,提出了一个协同多媒体著作工具中分布交互式多媒体文档的同步模型。在此模型中,文档结构分为三层：页面层、对象组层及单媒体对象层,根据各层的特点,其同步分别采用基于跳转、基于事件及基于时间的策略。     

Case studies in intelligent multimedia presentation design systems in terms of the standard reference model: the IMMPS project, the PreGen system, and the StrMP system

This paper contributes to a Standard Reference Model (RM) for intelligent multimedia presentation systems. In the past few years, we have developed several intelligent presentation systems at the Multimedia Information NEtwork (MINE) Lab at Tamkang University. We describe these systems in terms of architecture and function of components. The first system, Intelligent MultiMedia Presentation System (IMMPS), allows a presentation designer to construct knowledge rules reflecting the background of individual audiences. Therefore, the generated presentation is able to learn from the audiences, which results in different presentation for each individual. The second system (PreGen) uses inference rules for the automatic generation of multimedia presentations. An ICON programming technique is also used in the PreGen project. Another system for designing structured multimedia presentations using data flow/control flow diagrams is also discussed. In order to run multimedia presentations generated by different systems, we are developing a multimedia abstract machine, which is a time Petri net based software simulator for running multimedia assembly instructions.     

Eventor: an authoring system for interactive multimedia applications

Programming, testing, and maintaining interactive multimedia applications (IMAs) are still difficult and expensive, while substantial progress has been made to reduce the burden on authors. As IMAs get larger and more complex the difficulties will increase. To overcome the complexity of such IMAs, we argue that authoring systems should provide such facilities as (1) a traditional and intuitivedivide-and-conquer paradigm for solving large and complex problems in various fields, (2)formal specification of the behaviors of IMAs for checking the syntactic correctness of visual expressions or semantic anomalies, and (3)automatic aids like validation of temporal constraints and verification of visual expressions. In this paper, we investigate the properties of IMAs for recognizing the inherent interactivity and concurrency. We propose a specification method based on Milner'sCalculus of Communicating Systems (CCS), which is a well-known formal mechanism for specifying the concurrency in various distributed applications. We also design and implement an authoring system calledEventor (Event Editor), which is based on CCS and composed of three tools: a Temporal Synchronizer, a Spatial Synchronizer, and a User Interaction Builder. They focus on describing the temporal and spatial synchronizations and user interactions while they rely on existing tools in Intel's Digital Video Interactive (DVI) for supporting other functionalities. By editing a simple computer aided instruction (CAI) application, we illustrate that our specification mechanism is well-suited for handling the interactivity of multimedia applications, and Eventor is a simple, efficient, and powerful enough tool to handle practical applications. Especially the incremental refinement and the formal specification based on the CCS allow Eventor to be extended with formal verifications to cope with large and complex applications.     

超媒体同步模型研究

本文以Ｄｘｔｅｒ超文本参考模型为标准,吸收了Ａｍｓｔｅｒｄａｍ超媒体和Ｔｒｅｌｌｉｓ模型的优点,将所提出的分布多媒体同步Ｐｅｔｒｉ网模型扩展到超媒体,即提出一种分布超媒体同步Ｐｅｔｒｉ网模型。该模型可较好地解决分布超媒体系统中超链、对象同步和用户交互三个关键问题。     

A Scalable Toolkit for Designing Multimedia Authoring Environments

This paper introduces Kaomi, a scalable toolkit for designing authoring environments of multimedia documents. The underlying concept is to provide the designer of multimedia applications with a fast method to get an authoring system based on a set of synchronized views (the presentation view for displaying the document, the scenario view for showing the temporal organization of the document, ...) so that each view is the support of editing actions. Kaomi is flexible enough to support a variety of multimedia documents declarative formats. It is indeed a scalable toolkit since it provides facilities for extending and/or for modifying the resulting authoring environment. In addition, cross-platform portability is provided which allows operation in the heterogenous Internet environment. The use of Kaomi is mainly described through the design of two authoring environments: one for authoring a sub-set of the Smil standard of the W3C and the other one for Madeus, a constraint based multimedia language.     

一个基于积件基思的新一代多媒体辅助教学系统的设计与实现

从我国当前多媒体辅助教学软件的发展情况出发,在积件思想的多多体著作系统设计思想推导下,介绍了一个多媒体辅助教学的设计与实现,其中主要讨论了系统总体结构,积件平台的选取,提出了一个平台制作的课件的结构模型。     

多媒体信息在分布式环境下的同步

多媒体同步是分布式多媒体信息系统中的重要问题。本文论述了国内外在同步关系的描述、同步控制机制以及网络协议的扩展方面的研究成果，并展望了今后的研究方向。     

An ODA-like Multimedia Document System

A multimedia document is composed of different media objects. ISO's Open Document Architecture (ODA) proposes a standard multimedia document model. However, the current ODA profile only includes static media, e.g. text, geometric graphics and images. Because the future multimedia documents not only include static media but also continuous media, e.g. video and audio, continuous media document parts should be added to have a complete multimedia document model. In this paper, we propose a multimedia document model, which is derived from ODA's concept. The proposed model is based on the object-oriented approach. Objects in the proposed document model are divided into two types: data objects and pseudo objects. Data objects are data structures of a document; pseudo objects are used to manage data objects. Based on the proposed model, a multimedia document authoring and presenting system (MMDS) is also developed on SUN SPARC workstations using the Solaris 2.X operating system     

分布式多媒体数据库技术研究

随着Ｉｎｔｅｒｎｅｔ／Ｉｎｔｒａｎｅｔ技术、多媒体技术以及数据库技术等的发展，分布式多媒体数据库技术研究和应用已成为数据库发展的主流方向之一。在分析实现多媒体数据库管理系统ＭＤＢＭＳ的主要问题的基础上，提出并讨论了研究和实现ＭＤＢＭＳ的主要内容和关键技术，并提出了三种实现方法：扩充关系数据库方法、面向对象方法和超文本或超媒体方法。