基于面向对象技术的多媒体开发工具YH—MMDT

ＹＨ－ＭＭＤＴ是针对多媒体作品的特点，并基于面向对象技术而设计的一个多媒体开发工具包。我们提出了一人新的多媒体作品管理模型ＷＮＣＨ，该模型以作者／读者辩证统一的观点为观点，以结点对象为基本信息单位，以内容对象处理多媒体信息，以热区对象处理超链接功能，进而形成了一组完整的多媒体开发工具。     

基于面向对象技术的多媒体作品管理模型

ＷＮＣＨ（ｗｏｒｋｓ，ｎｏｄｅ，ｃｏｎｔｅｎｔ，ｈｏｔｓｐｏｔ）模型是根据多媒体作品的作者和读者相统一的认知观点和多媒体作品的特点，采用超文本方式，结合面向对象方法设计的多媒体作品管理与组织模型，本文分析了多媒体作品的一般性特点，介绍了当前当前多媒体信息模型的典型例子，并着重讨论了ＷＮＣＨ模型的组织、设计、表示能力及在多媒体作品管理（创作、阅读和导航）中的应用。     

对象-关系数据库对多媒体的支持技术

对象－关系型数据库已成为当今数据库领域研究和发展的热点。文章以多媒体数据管理和应用的需求为出发点,讨论了对象－关系型数据库对多媒体数据的管理方法,即通过对关系数据库管理系统（ＲＤＢＭＳ）进行扩展,使之能支持新引入的用户定义类型（ＵＤＴ）、用户定义函数（ＵＤＦ）、大对象（ＬＯＢ）、关系扩展器（ＲＥＬＡＴＩＯＮＡＬ ＥＸＴＥＮ－ＤＥＲ）等对象－关系模型特色,并通过数据链技术控制机制来实现对数据库及外部文件系统中大量的复杂多媒体数据的管理。这些多媒体扩展机制保留了所有的ＲＤＢＭＳ的长处和优点,增加了对复杂的多媒体应用的支持。     

对象-关系数据库对多媒体的支持技术

对象－关系型数据库已成为当今数据库领域研究和发展的热点。文章以多媒体数据管理和应用的需求为出发点,讨论了对象－关系型数据库对多媒体数据的管理方法,即通过对关系数据库管理系统（ＲＤＢＭＳ）进行扩展,使之能支持新引入的用户定义类型（ＵＤＴ）、用户定义函数（ＵＤＦ）、大对象（ＬＯＢ）、关系扩展器（ＲＥＬＡＴＩＯＮＡＬ ＥＸＴＥＮ－ＤＥＲ）等对象－关系模型特色,并通过数据链技术控制机制来实现对数据库及外部文件系统中大量的复杂多媒体数据的管理。这些多媒体扩展机制保留了所有的ＲＤＢＭＳ的长处和优点,增加了对复杂的多媒体应用的支持。     

高速数字信号处理系统的硬,软件接口技术

本文介绍当前数字信号处理（ＤＳＰ）系统较为流行的结构，即以ＩＢＭ－ＰＣ及其兼容机作主ＣＰＵ，以ＴＭＳ３２０Ｃ３０作为从ＣＰＵ构成的宿主式系统，这里Ｃ３０是运算部件，而系统机是控制，管理和开发工具，两者的结合即高效又经济，并具有一定的通用性。     

开放式分布处理的参考模型

开放式分布处理的参考模型（ＲＭ－ＯＤＰ）是由国际标准化组织ＩＳＯ和ＩＴＵ－Ｔ为开放式分布处理ＯＤＰ而开发的一个协调框架，此模型描述了一个集成的支持分布式，协同工作（ｉｎｔｅｒｗｏｒｋ－ｉｎｇ）的可互操作的和可移植的体系结构，ＲＭ－ＯＤＰ框架用五个观点来定义ＯＤＰ的内容，这五个观点分别是：计划观点，信息观点，计算观点，工程观点和技术观点，本文介绍此参考模型，并且描术其观点和ＯＤＰ的有关功能，以及相应     

GCC在平台模型MODE上的移植

本文阐述如何在平台模型ＭＯＤＥ上移植ＧＣＣ，并比较了ＭＯＤＥ和ＹＨ－２的差别。     

一种新的求解线性时变系统的数值解法

一种新的求解线性时变系统的数值解法贾磊，孙优贤（山东轻工业学院机电系）（浙江大学工业控制研究所）ＡＮＥＷＮＵＭＥＲＩＣＡＬＭＥＴＨＯＤＯＦＴＨＥＬＩＮＥＡＲＴＩＭＥ－ＶＡＲＩＮＧＳＹＳＴＥＭＳＶＩＡＳＨＩＦＴＥＤＪＡＣＯＢＩＳＥＲＩＥＳ￥ＪｉａＬｅｉ...     

一个基于构件的分布式多媒体存取机制CDMAM

本文提出了一种分布式多媒体存取机制ＣＤＭＡＭ,ＣＤＭＡＭ基于多媒体数据处理的流水线模型,以构件作为分布式多媒体数据存取基础,实现了媒体基本处理、ＱＯＳ状态调整以及同步控制等功能,通过构件管理器,ＣＤＭＡＭ实现了网络透明和平台无关。     

采用标准数据接口SDAI的CAD／CAM系统集成

如何将ＳＴＥＰ的方法和规范应用于系统开发是解决计算机集成制造系统（ＣＩＭＳ）开发的关键问题之一。集成化ＣＡＤ／ＣＡＭ系统是ＣＩＭＳ的核心，实现将ＣＡＤ的工程设计功能和ＣＡＭ的制造功能的结合。本文讨论通过ＳＴＥＰ的标准数据接口ＳＤＡＩ实现系统集成的集成方法，采用ＳＴＥＰ的数据交换、建模思想，实现了一个产品模型为核心的ＣＡＤ、ＣＡＭ集成系统－ＧＨＣＡＤ（高化ＣＡＤ）。     

Labyrinth, an abstract model for hypermedia applications. Description of its static components

In information technology, models are abstract devices to represent the components and functions of software applications. When a model is general and consistent, it represents a useful design tool to unambiguously describe the application. Traditional models are not suitable for the design of hypermedia systems and, therefore, specific design models and methodologies are needed. In the present article, the requirements for such models are analysed, an overview of the characteristics of the existing models for hypermedia applications is made and an abstract model fulfilling the analysed requirements is presented. The model, called Labyrinth, allows 1) the design of platform-independent hypermedia applications; 2) the categorisation, generalisation and abstraction of sparse unstructured heterogeneous information in multiple and interconnected levels; 3) the creation of personalisations (personal views) in multiuser hyperdocuments for both groups and individual users and 4) the design of advanced security mechanisms for hypermedia applications.     

Constructing Geographic Digital Libraries using a Hypermedia Framework

This paper presents an object oriented hypermedia database framework for designing and building digital libraries, which are treated as enhanced hypermedia applications. It is based on combining and extending results from two domains: the navigation characteristics of hypertext systems, and the view mechanism and the persistent storage management facility of an object oriented database management system. As a result, users can alternate between two integrated types of interaction modes. The hypertext dimension of the framework allows navigation via static and dynamic hyperlinks; the object oriented database support enables querying by content and metadata management. The framework includes still a digital library design methodology that guides the implementation of digital libraries over the OODBMS. This proposal integrates hypermedia and DL concepts to a database environment, being instantiated on the realm of geographic data.     

Examining Cognitive Processing in Hypermedia Usage

As a growing learning technology, hypermedia needs to be examined in terms of the cognitive processes it encourages in users. The characteristics that circumscribe hypermedia are first discussed. Two perspectives on learning from hypermedia are then presented. These are purpose of usage (culture, education, information) and usage context. Four cognitive processes involved in hypermedia usage are described. These are browsing, searching, integrating, and angling (establishing multiple perspectives). Two cognitive pitfalls are also discussed: hyperspace wandering and cohesion deficit. It is concluded that both practical and theoretical concerns emerge out of this focus on cognitive processes in hypermedia.     

HADT: Hypermedia application development tool for tourist applications

This paper describes an authoring tool prototype design for the development of hypermedia applications. The system is based on a generic object oriented data model suitable for hypermedia, that has been designed and implemented in our department. The model is extensible for integrated multimedia manipulation and provides an enhanced linking system. The design aims at a general purpose hypermedia application development tool which may well be used for the development of tourist applications. It is of special interest in the Greek tourist market since tourism contributes considerably to the national income of Greece. Current technology provides the hardware for manipulation of multimedia information and increases the quantity and quality of information flow between the user and the machine. Thus in a travel agency environment it would be desirable to have an interactive multimedia demonstration helping the user find places of interest in any context (physical beauty, archaeological interest, tourist infrastructure, possible itineraries etc.). Such a tool would be very effective compared with the static presentation of brochures. HADT has the potential to fulfil these needs when it is developed, and in this paper we explore such possibilities. Furthermore, research directions for future work are discussed.     

基于Petri网的智能超媒体模型

智能超媒体是多媒体技术与专家系统的理想结合，Petri是描述系统行为的形式化工具。该文利用有色Petri网、扩展OCPN模型，采用立体层次结构，提出了一种基于Petri网的智能超媒体模型。该模型能较好地描述专家系统中规则的推理、多媒体中各种媒体的链接与同步以及与用户的交互和表现问题。     

Towards A New Authoring Methodology for Large-Scale Hypermedia Applications

As the amount of information technology increases, managing information resources, so that the correct people can find the information easily, becomes a critical issue. Hypermedia systems are considered one solution to this problem as they provide a means for representing higher level relationships between the underlying information. However, the amount of information available electronically is increasing at an accelerated rate. Using standard hypermedia authoring techniques, the effort required managing and maintaining large-scale hypermedia systems is enormous. Hypermedia authoring in the large requires new methodologies if it is going to be feasible.This paper presents a new model for building and structuring large-scale hypermedia applications. It describes a case study that explored the delivery of hypermedia information in an industrial environment on a small scale. Models and techniques developed for that case study were then refined and augmented so they could support the construction of large-scale hypermedia systems. In order to support such endeavors a new linking model is presented that allows the author to explicitly represent abstract concepts contained within the underlying information and interconnect them in some meaningful manner. A prototype system applying this linking technique is presented.     

CAI中的智能超媒体技术研究

将智能化行为引入到超媒体系统中,在超媒体的链和结点中嵌入知识或规则,允许链进行计算和推理,使链具有动态跟踪与动态引导功能,使得媒体信息具有更丰富的表现特性,这是智能超媒体的主要研究的内容。文章探讨了智能超媒体的相关实现技术,建立了ＣＡＩ领域的相关知识与推理模型,设计与实现了网上多媒体ＣＡＩ系统中的智能超媒体功能。     

数据库技术在模糊聚类预测中的应用研究

将数据库技术应用于模糊聚类预测中，用ＦＯＸＰＲＯ开发了模糊聚类预测软件，通过对上海水泥厂提供的实测数据的实旆计算，取得了令人满意的结果，文中提供的方法具有普遍的意义和广阔的应用前景，作为数据库技术原应用开辟了新领域。     

A hybrid system approach for supporting digital libraries

A digital library (DL) consists of a database which contains library information and a user interface which provides a visual window for users to search relevant information stored in the database. Thus, an abstract structure of a digital library can be defined as a combination of a special purpose database and a user-friendly interface. This paper addresses one of the fundamental aspects of such a combination. This is the formal data structure for linking an object oriented database with hypermedia to support digital libraries. It is important to establish a formal structure for a digital library in order to efficiently maintain different types of library information. This article discusses how to build an object oriented hybrid system to support digital libraries. In particular, we focus on the discussion of a general purpose data model for digital libraries and the design of the corresponding hypermedia interface. The significant features of this research are, first, a formalized data model to define a digital library system structure; second, a practical approach to manage the global schema of a library system; and finally, a design strategy to integrate hypermedia with databases to support a wide range of application areas. Received: 15 December 1997 / Revised: June 1999