基于Web Services的异构空间信息共享

异构集成技术正日益成为信息资源管理的一个热点技术。以地理信息共享的应用为背景,提出了基于Web Services的异构空间信息共享体系结构。通过引入Web Services技术架构,设计了一个异构空间信息共享系统。该系统可提供各信息源灵活、动态发布自身服务的功能,从而为快速构建异构集成系统提供了性能保证。     

基于Web服务的异构数据交换方案设计与实现

基于Web服务的异构数据交换方案能够解决互联网环境下跨编程语言、跨操作系统的异构数据交换问题。基于Web服务架构，设计了一个层次式的异构数据交换方案，并利用XML技术以及SUN公司的JWSDP完成了一个异构数据交换原型系统，它实现了关系数据库异构数据的自描述和分布式环境下的交换与共享。同时，详细介绍了其核心模块——XML模式与关系模式的转换。     

多媒体会议系统MCONF的共享显示原理

共享应用程序是多媒体电子会议系统中的一类重要的应用程序，它为会议系统中不同节点的用户提供了一种交互手段。本文的前半部分介绍了多媒体电子会议系统的发展和作者所在的课题小组所完成的多媒体会议系统（ＭＣＯＮＦ）的概况，然后介绍了一个共享应用程序：基于字符编辑的共享文本编辑（ＳｈａｒｉｎｇＥｄｉｔｏｒ）设计方案和实现技术     

基于ERP的电力企业数据集成研究

整合异构数据源是电力企业提升信息化水平的必由之路,介绍了一个以ERP为核心,以XML和Web Ser-vice为基础的电力企业数据交换和共享平台模型,通过该平台实现了电力企业新开发的ERP系统和遗留系统异构数据源之间跨平台的数据交换和共享。应用案例表明,该平台实现了企业ERP与异构数据源数据共享与交换,为企业信息化打下了坚实的基础。     

多媒体电子会议系统模型的研究

本文介绍了一个我们自行设计研制的多媒体电子会议系统。文中，首先对ＭＴＣＳ的系统结构、系统模型软件结构的设计作了简要的介绍，然后对多媒体电子会议中的一些重要问题进行了讨论。这些问题包括实时与同步的控制，会议资源的管理、异构多媒体设备的集成管理等。     

集成异构数据源的在线考试系统研究

本文针对异构环境下在线考试系统的集成提出的一种解决方案,在不影响原系统的基础上,构建一个集成平台,实现异构数据库到XML格式文件的转换,使得异构环境下的在线考试系统可以共享数据。重点论述集成异构在线考试系统设计与实现:异构数据源集成的需求、系统功能模块设计、XML数据集成设计。包括包装器、查询处理模块、结构处理模块的设计,实现由不同数据库到XML格式数据的转换集成,实现了在线考试信息系统中异构数据的共享。     

异构无线网络环境下信息共享技术研究

传统的异构无线网络环境的信息共享策略仍然是建立在紧耦合、硬绑定的交互机制和技术基础之上,基于内容的信息探测与定位能力不足,不能适应网络环境变化。论文研究了共享空间管理和分布式节点的动态组织维护与管理,及异构数据源统一访问技术,提出了基于元数据的共享策略,解决异构数据访问问题。设计与实现了一个面向领域的信息共享系统,以支持共享信息的发现和获取。     

基于本体的分布式CBR设计系统

提出了一种分布式基于案例推理设计系统框架。该框架通过本体服务器在分布式案例库之间建立共享本体，每个案例库在共享本体的约束和指导下可以灵活地表示各自的领域知识。各案例库的知识表示都遵循共享本体约定，实现了知识集成。系统采用Web Service技术构建，能够实现分布式异构环境下的系统集成。该框架是一个开放的系统框架，具有很强的可扩展性。     

农村科技信息共享服务系统的设计和实现

随着农村信息化建设的迅速发展，有效的信息共享及信息服务成了急待解决的重要问题。苯文提出了一个新的信息共享服务系统的框架，它通过统一、标准的信息接口、资源描述元数据及共享协议，将分布异构的农村科技信息有效地整合到共享平台下，使各个分散的信息源能够方便、快捷地成为共享服务系统中的一部分。系统通过共享访问模块访问信息源，实现信息共享，快速、准确地提供全方位、多层次的信息服务。     

基于Java和XML技术的异构信息系统数据集成框架应用研究

企业信息化的逐步深入，企业内部以及企业之间存在着大量异构信息的交互和共享，Java与可扩展的标记语言(XML)技术为实现网络环境下异构信息的交互提供了解决方案。提出应用Java和XML技术建立适用于企业信息化的面向异构系统数据集成的框架结构，并对实现框架结构所涉及的关键技术和实现方法进行了研究，在此框架结构的基础上建立了基于Web的面向异构应用系统的集成适配器工具，作为一个主要的支撑工具模块，在基于PDM技术的项目管理系统中得到了应用。     

异构的多媒体数据共享系统UNIX客户机子系统的实现

我们设计实现了一个异构的多媒体数据共享系统。系统中包括ＵＮＩＸ与Ｗｉｎｄｏｗｓ两种客户机。本文介绍ＵＮＩＸ客户机子系统的实现情况。     

A model for secure multimedia document database system in a distributed environment

The Internet provides a universal platform for large-scale distribution of information and supports inter-organizational services, system integration, and collaboration. Use of multimedia documents for dissemination and sharing of massive amounts of information is becoming a common practice for Internet-based applications and enterprises. With the rapid proliferation of multimedia data management technologies over the Internet, there is growing concern about security and privacy of information. Composing multimedia documents in a distributed heterogeneous environment involves integrating media objects from multiple security domains that may employ different access control policies for media objects. In this paper, we present a security model for distributed document management system that allows creation, storage, indexing, and presentation of secure multimedia documents. The model is based on a time augmented Petri-net and provides a flexible, multilevel access control mechanism that allows clearance-based access to different levels of information in a document. In addition, the model provides detailed multimedia synchronization requirements including deterministic and non-deterministic temporal relations and incomplete timing information among media objects.     

PeerLearning: A Content-Based e-Learning Material Sharing System Based on P2P Network

Managing and retrieving reusable learning materials in a content-based way is a big challenge in e-Learning material sharing systems. E-Learning materials are highly heterogeneous; they may exist in the form of video, audio, image, slide or plain text. Furthermore, the learning systems are highly dynamic in the presence of massively increasing multimedia materials. P2P network seems to be one of the most promising infrastructures to deal with the challenge in such highly dynamic environments. In this paper we propose a Peer-to-Peer (P2P) infrastructure based on the trie tree and the deBruijn structure. It can support efficiently query processing in highly dynamic scenarios. Furthermore we develop a P2P e-Learning system PeerLearning to provide two content-based learning material sharing services: a keyword search component for supporting content-based document sharing and a content-based retrieval method for multimedia materials. Extensive experiments are conducted in this study to verify the superiority of our methods over the existing works.     

Heterogeneous and Multifaceted Multimedia Objects in DOOR/MM: A Role-Based Approach with Views

Although the distributed multimedia information system is getting popular nowadays, existing database systems do not offer adequate support to structural nor behavioral extension of multimedia objects. Moreover, the multifaceted nature of multimedia data has seldom been investigated. Besides the flexibility for multimedia authoring tools, dynamic extension and multifacet modeling can in general ease the task on integrating the multimedia information of heterogeneous formats over a distributed network. This paper presents the support of dynamic extension and multifacet modeling of multimedia objects in a client-server, object-role database system called DOOR. The resultant system, with multimedia functionalities, is named as DOOR/MM (DOOR with multimedia extensions). First, the underlying data model for DOOR is summarized. We then present the extension of the data model, by means of meta-object protocol (MOP), to implement the metaclasses for multimedia objects. In DOOR, objects are structured as a tree of roles. Each role may carry different properties and interact with other roles cooperatively. An object may acquire or drop multiple roles during its lifetime. Structural and behavioral extensions of multimedia objects are achieved by dynamic role playing. Multifaceted interfaces of an multimedia object are modeled by means of views on roles. In particular, we discuss different ways of using views to model different abstraction levels of the heterogeneous multimedia resources. Throughout the paper, examples such as text, bitmap, MIDI, and 3D graphic objects are used to demonstrate the significance of our approach.     

A unified multimedia and semantic perspective for data retrieval in the semantic web

In recent years, the emerging diffusion of peer-to-peer networks is going beyond the single-domain paradigm like, for instance, the mono-thematic file sharing one (e.g. Napster for music). Peers are more and more heterogeneous data sources which need to share data with commercial, educational, and/or collaboration purposes, just to mention a few. Moreover, in current information processing applications data cannot be meaningfully searched by precise database queries that would return exact matches (e.g. when dealing with multimedia, proteomic, statistical data).     

人造复杂系统的多媒体认知软件中数据模型的研究

文章根据人造复杂系统的特性和人的认知规律,提出了一个基于对象的多媒体认知软件系统数据模型。数据模型由媒体存取层、多媒体对象层和多媒体表现层和多媒体应用层构成。这种层次模型将媒体异构环境存取、多媒体对象处理和语义合成表现以及各种时序关系等问题在不同层次分别进行处理,使软件系统具有很好的灵活性和可复用性。     

A mediator-based approach for integrating heterogeneous multimedia sources

In many applications, the information required by the user cannot be found in just one source, but has to be retrieved from many varying sources. This is true not only of formatted data in database management systems, but also of textual documents and multimedia data, such as images and videos. We propose a mediator system that provides the end-user with a single query interface to an integrated view of multiple heterogeneous data sources. We exploit the capabilities of the MOMIS integration system and the MILOS multimedia data management system. Each multimedia source is managed by an instance of MILOS, in which a collection of multimedia records is made accessible by means of similarity searches employing the query-by-example paradigm. MOMIS provides an integrated virtual view of the underlying multimedia sources, thus offering unified multimedia access services. Two features are that MILOS is flexible—it is not tied to any particular similarity function—and the MOMIS’s mediator query processor only exploits the ranks of the local answers.     

Secure interoperable digital content distribution mechanisms in a multi-domain architecture

Current DRM systems use the Authorized Domain concept to allow sharing of DRM-enabled multimedia contents across multiple devices. However, some devices in an authorized domain may support only a limited number of DRM systems of the content providers due to their heterogeneous capabilities. Lack of interoperability among DRM systems enforces these devices to stick to a common DRM system which restricts the sharing of different DRM-enabled multimedia contents among them. Most of the current solutions use a translation entity to provide interoperability among different DRM standards with a trust assumption over that entity. This assumption may not assure the content providers that their contents and licenses will be translated and distributed in a secure and legal way. In this paper, we propose a secure interoperable content distribution mechanism for commercial and user generated contents among multiple authorized domains without any trust assumption on the translation entity.     

A portable UPnP-based high performance content sharing system for supporting multimedia devices

Since the development of traditional home multimedia is yet to be improved, the various multimedia devices are used for playing media content. Under the advancement of modern science and technology, there are various formats of compact discs to store and play multimedia content, such as VCD, DVD, portable disks, etc., and the latest, Blu-ray disc. However, it is difficult for these devices to share the content without any configuration. In order to solve the problem of playing effectively, we propose a portable UPnP-based high performance content sharing system for supporting multimedia devices, which includes a content sharing server, and media players. The content sharing server can realize the share services and file control of the portable disk, iPod, DVD, digital TV, and other devices, so that users no longer need to carry out complex processes to install software and settings, as the media players can allow users to play the multimedia file on any media device.     

电子政务系统的空间数据安全交换体系研究

随着电子政务系统不断应用,不同行业部门和社会领域对数据资源的安全共享提出了很大的需求。如何实现异构数据资源的安全共享,打破＂信息孤岛＂障碍,提高政府行政效能已成为当前迫在眉睫的任务。文章在分析异构数据源转换的基础之上,提出基于GML（Geography Markup Language,地理标识语言）的电子政务空间数据安全交换体系,实现了异构系统空间数据的安全实时共享,为解决异构系统之间数据安全互操作问题提供了有益的借鉴思路。