The RightPages image-based electronic library for alerting and browsing

The RightPages electronic library prototype system, which gives users full online library services, is described. The prototype takes advantage of fast hardware, multimedia workstations, and broadband networks to process scientific and technical journals for users and to offer a service that: alerts them to the arrival of new journal articles matching their interest profiles; lets them immediately examine images of pages in the alerted articles and browse through other articles in the database; and enables them to order paper copies of any articles in the database. The system runs on a local area network that connects one or more scanning stations, a centralized document database server and multiple user stations running X Windows servers. The RightPages interface runs as an X Windows application on Sun workstations or X terminals. The system's image and document processing, including noise reduction, document layout analysis, text processing, and display processing are discussed.<>     

Remote Access to Multimedia Databases: An Object Oriented Approach

Recent advances in media processing technology have resulted in the generation of vast amounts of multimedia information. There exists a need to manage this information. This paper describes the design and implementation of an object-oriented system used for remote multimedia database access. The work includes the design of a framework to model multimedia information in the object-oriented database POET, the development of a POET multimedia server to provide access to this information and the design of client interfaces to the system.     

网络医学多媒体教学资料安全管理的设计

根据医学教师的多媒体教学资料在网络中安全管理的需求,提出了网络医学多媒体教学资料安全管理的结构设计,它包括了数据库认证设计和文件的加密设计,并给出了数据库认证的结构设计和基于类模块Rijndael以及COM组件技术的机密文件安全管理系统模型,根据此结构设计和系统模型可以实现文件的安全存储和传输,具有一定的通用性,确保文件在网络存储和传输的安全.     

Buffer model and management in distributed multimedia presentation systems

The delivery of continuous and synchronous multimedia data from a database (or file) server to multiple destinations over a network presents new challenges in the area of buffer management. Many factors that were not considered in conventional buffer management must be examined. In this paper, we investigate the principles of buffer model and management for multimedia data presentations in distributed systems. The primary goal is to minimize the response time of multimedia presentations while ensuring that all continuity and synchronization requirements are satisfied. A framework for buffer model and management is introduced. Minimum buffering requirements at both client and server sides to guarantee the continuity and synchrony of the presentation of multimedia data are examined. A prefetching and replacement strategy which satisfies these requirements is then offered. These principles and techniques provide users with the full range of information required to develop a distributed system for multimedia presentations.     

A computer-assisted data collection system for use in a multicenter study of American Indians and Alaska Natives: SCAPES

We describe a computer-assisted data collection system developed for a multicenter cohort study of American Indian and Alaska Native people. The study computer-assisted participant evaluation system or SCAPES is built around a central database server that controls a small private network with touch screen workstations. SCAPES encompasses the self-administered questionnaires, the keyboard-based stations for interviewer-administered questionnaires, a system for inputting medical measurements, and administrative tasks such as data exporting, backup and management. Elements of SCAPES hardware/network design, data storage, programming language, software choices, questionnaire programming including the programming of questionnaires administered using audio computer-assisted self-interviewing (ACASI), and participant identification/data security system are presented. Unique features of SCAPES are that data are promptly made available to participants in the form of health feedback; data can be quickly summarized for tribes for health monitoring and planning at the community level; and data are available to study investigators for analyses and scientific evaluation.     

High-Performance Telemedicine Information Management

The rapid advances in high performance global communication have accelerated cooperative image-based medical services to a new frontier. Traditional image-based medical services such as radiology and diagnostic consultation can now fully utilize multimedia technologies to provide novel services, including remote cooperative medical triage, distributed virtual simulation of operations, as well as cross-country collaborative medical research and training. Fast (efficient) and easy (flexible) retrieval of relevant images remains a critical requirement for the provision of remote medical services. This paper describes the database system requirements and presents a system architecture of a distributed multimedia database system, MISSION-DBS, which has been designed to fulfill the goals of Project MISSION (medical imaging support via satellite integrated optical network)—an experimental high performance gigabit satellite communication network linking remote supercomputing power, medical image databases, and 3D visualization capabilities, in addition to medical expertise anywhere and anytime around the globe. The MISSION-DBS design employs a synergistic fusion of techniques in distributed databases (DDB) and artificial intelligence (AI) for storing, migrating, accessing, and exploring images. The efficient storage and retrieval of voluminous image information is achieved by integrating DDB modeling and AI techniques for image processing while the flexible retrieval mechanisms are accomplished by combining attribute-based and content-based retrievals.     

分布式多媒体DBMS的研究与开发

本文介绍分布式多式 媒体数据库管理系统－ＤＭ２。它基于作者提出的层次－关系数据模型，采用客户－服务器体系结构、多线索调度等一系列当代先进的软件技术，从而为用户建立多媒体ＭＩＳ提供了一个良好的开发环境。     

A spatio-temporal semantic model for multimedia database systemsand multimedia information systems

As more information sources become available in multimedia systems, the development of abstract semantic models for video, audio, text, and image data is becoming very important. An abstract semantic model has two requirements: it should be rich enough to provide a friendly interface of multimedia presentation synchronization schedules to the users and it should be a good programming data structure for implementation in order to control multimedia playback. An abstract semantic model based on an augmented transition network (ATN) is presented. The inputs for ATNs are modeled by multimedia input strings. Multimedia input strings provide an efficient means for iconic indexing of the temporal/spatial relations of media streams and semantic objects. An ATN and its subnetworks are used to represent the appearing sequence of media streams and semantic objects. The arc label is a substring of a multimedia input string. In this design, a presentation is driven by a multimedia input string. Each subnetwork has its own multimedia input string. Database queries relative to text, image, and video can be answered via substring matching at subnetworks. Multimedia browsing allows users the flexibility to select any part of the presentation they prefer to see. This means that the ATN and its subnetworks can be included in multimedia database systems which are controlled by a database management system (DBMS). User interactions and loops are also provided in an ATN. Therefore, ATNs provide three major capabilities: multimedia presentations, temporal/spatial multimedia database searching, and multimedia browsing     

网络课程页面在线生成管理系统

本文首先简要分析了当前网络远程教学中的网页制作状况，然后运用活动服务器页面技术和远程多媒体资源管理技术，设计了一套基于数据库管理技术的在线设计管理网络课程页面的系统。由于在线教师能够轻松获得服务器上已有的网页素材和网页信息，从而能够充分地重用及方便地管理它们。该系统使得即使是异地的网络教师也可以很方便地地合作开发课程页面。     

I-Media: An integrated Media server and Media database as a basic component of a cross Media publishing system

The publication of the same information on different media, the so-called Cross Media Publishing (CMP), is becoming one of the central aspects in today's publishing industry. CMP centers on a media independent document definition and an efficient integrated publishing on different media: e.g. as a paper document, as an online document in the World Wide Web, and as an offline (CD-ROM based) multimedia presentation. The aim of CMP is to get these different media at the same stage, while—and that is important—spending an acceptable amount of additional effort (in time and money) for production. In this paper we present a solution for a key problem of Cross Media Publishing, the handling of media data (images, audio, video, etc.) by using a combined approach of server and database systems functionality. The integrated multimedia server and database i-Media and its role in a complete CMP solution will be presented.     

视频会议系统中数据缓冲机制的研究

在视频会议系统中,服务器端多媒体数据流的存储转发有其特殊的背景和要求,因而需要一个高性能的多媒体数据流的缓冲机制,该机制的高效与否是制约视频会议系统性能的关键因素之一。在传统的生产者/消费者模型的基础上,结合多媒体业务的特殊环境,提出了一个新的数据流的缓冲机制模型,并在此基础上实现了一套集中式的多点视频会议系统。     

Efficient distributed SAT and SAT-based distributed Bounded Model Checking

SAT-based Bounded Model Checking (BMC), though a robust and scalable verification approach, still is computationally intensive, requiring large memory and time. Even with the recent development of improved SAT solvers, the memory limitation of a single server rather than time can become a bottleneck for doing deeper BMC search for large designs. Distributing computing requirements of BMC over a network of workstations can overcome the memory limitation of a single server, albeit at increased communication cost. In this paper, we present (a) a method for distributed SAT over a network of workstations using a Master/Client model where each Client workstation has an exclusive partition of the SAT problem and uses knowledge of partition topology to communicate with other Clients, (b) a method for distributing SAT-based BMC using the distributed SAT. For the sake of scalability, at no point in the BMC computation does a single workstation have all the information. We experimented on a network of heterogeneous workstations interconnected with a standard Ethernet LAN. To illustrate, on an industrial design with ∼13 K FFs and ∼0.5 million gates, the non-distributed BMC on a single workstation (with 4 GB memory) ran out of memory after reaching a depth of 120; on the other hand, our SAT-based distributed BMC over 5 similar workstations was able to go up to 323 steps with a communication overhead of only 30%.     

分布式多媒体数据库模型的设计及对服务器数据库访问方法探索

计算机科技工作者对多媒体的理论及模型设计进行了广泛的探索与研究,提出了不少模型设计的方法,如：用面向对象的方法,其优点是表示复杂的结构方便,但实现较困难。针对多媒体数据库的特点及网络化的需要,该文提出了一种数据库的模型设计,并对基于ＴＣＰ／ＩＰ协议的客户／服务器工作模式的数据库访问方法进行了研究;同时对多媒体数据库的数据在网络上的传送格式进行了定义。该文定义的多媒体数据库的数据类表示是关系数据库的扩展,又保持了关系数据库的规范性原理,也比较容易实现。     

基于混合P2P技术的远程教学系统的设计

传统的多媒体远程教学系统中,教学资源大多存放在中心服务器上,各分散学习点需要从服务器下载资源,服务器的性能及网络带宽将直接影响教学活动。将混合P2P技术引入多媒体网络教学中,会对多媒体的远程教育进行优化。本文设计一个基于混合P2P技术的远程教学系统,主要利用混合型P2P模型来实现视频点播和文件共享功能。     

基于Java的图片管理信息系统的设计与实现

结合图片管理系统的开发，给出了在大型数据库管理系统支持下，基于客户机／服务器模式开发管理信息系统的一种方法，并详细介绍了所开发系统的主要功能模块。该系统不仅具备完善的图片数据录入、更新、删除、条件检索等功能，而且进行了“图片专题”功能的开发，为扩展图片管理信息系统的应用模式进行了新的尝试。     

多媒体网络教学系统的设计与实现

网络教学系统是一种新的教学系统,它的出现改变了传统教学方式,能提高教学效率和学生参加教学活动的积极性。该系统结合教学系统的客户机/服务器以及浏览器/服务器这两种模式各自的优点提出了两者相结合的教学系统结构模式,并介绍了多媒体数据库的设计。在此基础上给出了一种全新的基于多媒体数据库技术实现网络教学系统的设计方法和实现结果。系统利用Visual Basic6.0和InformixWeb DataBlade作为主要开发工具进行设计开发。在系统的设计过程中,充分考虑了多媒体数据库的特点,使用了大量的图形、图像和动画,人机交互界面友好,操作简单,功能先进。     

基于校园网络的PeerCast数字直播系统

随着Internet的普及及信息技术的发展,传统客户机/服务器模式的IPTV,由于服务器I/O瓶颈的限制,已无法满足越来越多用户同时收视的需要。而在文件共享系统和数据库应用中使用PeerCast技术能够充分利用闲置的网络资源,实现有效的负载均衡,更适合应用在大规模的数字直播系统中。     

基于VC的聊天软件设计与实现

互联网的快速发展,促进了网络中的信息传输,网络聊天也变得越来越普及。本文从技术的角度出发,设计与实现了一款网络聊天软件。在本文中,我们首先介绍了软件的系统结构及设计思路,然后分别设计与实现了本软件的数据库系统、服务器软件和客户端软件。     

基于局域网的有限元网格分布式并行生成

在常见的PC＋Windows＋LAN环境下,采用Winsock API网络通信接口实现了局域网上的分布式并行有限元网格生成。网格生成区域在服务器上按照工作站数量被分解为若干个子区域,这些子区域及网格控制参数通过局域网（LAN）传给工作站。子区域在工作站上被剖分成子网格并通过局域网传回服务器以合并形成最终网格。算例表明只要有足够的计算节点,分布式并行技术可以将网格生成速度大幅度提高,而网络通信所占时间的比例基本固定。