多用户协作的Web知识获取

万维网上非结构化、异构、海量的信息资源给人们寻求合适的信息造成了困难.搜索引擎、个性化搜索工具及其他相关技术的使用,在一定程度上缓解了这个问题,但在面对人们长期的、系统的知识获取需求时,它们所起的作用相对有限.本文分析了人们通过万维网求知的一般过程,并结合一个系统的设计和实现讨论了能有效协助用户万维网求知的具体相关技术,并阐述了该多用户协作的万维网知识获取系统的整体结构和特点.     

基于关键词的深度万维网数据库选择

该文提出一种基于关键词的深度万维网查询方法:用户用关键词的方式提交查询,该方法在线地选择能够反映查询意图并且提供高质量结果的万维网数据库.这种方法既避免了深度万维网数据抓取这一代价高、难度大的操作,又可支持多领域的数据库上的关键词查询,从而能够与现有的搜索引擎实现无缝集成.文中侧重于讨论基于关键词的数据库选择,从以下两...     

基于Mapguide ActiveX控件的网络地图发布技术

文章讨论了在万维网地理信息系统(WEBGIS)技术的应用中,使用Mapguide ActiveX控件进行网络地图发布的WEBGIS二次开发技术。     

基于关键词的深度万维网数据库查询

深度万维网蕴藏着海量的信息,现有的搜索引擎很难搜索到其中的内容.如何充分地获取深度万维网中的有价值的信息成为一个难题.论文提出了基于关键词的深度万维网的数据库的查询方法,该方法采用朴素贝叶斯算法对关键词进行分类,并采用日志挖掘对采样的数据库进行统计,最终生成查询的SQL,语句.该方法不仅解决了深度万维网多领域的数据库查询,而且能够与现有的搜索引擎进行整合,帮助用户快速有效的查询.     

万维网地理信息系统发展及前景

万维网地理信息系统是地理信息系统和万维网相结合的产物,和传统的地理信息系统相比具有很多优越性,近几年来,国内外软件厂商开发了很多万维网地理信息系统平台软件,也在各行各业得到广泛的应用,万维网地理信息系统主要的构造方法有：CGI方法,服务器应用程序接口方法,插件法,Java Applet方法和ActiveX方法。WebGIS的构造模型包括浏览器／服务器三层和多层结构体系,WebGIS之间的互操作为空间信息共享提供了技术基础,OpenGIS提出了万维网地理信息系统的互操作模型,本文对WebGIS发展进行了综述,并分析了总结了WebGIS的发展趋势。     

语义万维网的概念、方法及应用

近两年来,语义万维网(semanticweb)的研究逐渐引起了知识表示、逻辑编程、信息系统集成、web开发等各个领域的广泛关注。笔者在研究万维网环境下的领域知识表示及语义共享模式的过程中,阅读了大量有关语义万维网的文献资料,认为,语义万维网的研究将对传统web上信息的发布、存储和处理方式产生一场变革,但是语义万维网的概念、思想和方法还处于形成阶段,国内少有综述性的文献,对语义万维网及其相关技术的认识比较模糊。该文分析了语义万维网的起源、概念、技术框架,总结了语义万维网及相关工具的现状,并讨论了语义万维网技术在智能信息检索、企业间数据交换、知识管理以及万维网服务中的应用。     

浅析单点登录系统(SSO)

单点登录技术是当前网络安全应用中的一项重要的技术,在万维网服务环境中能大大提高信息的安全度及工作效率.介绍和分析了当前两种主流单点登录协议的基本特点及实现流程,对单点登录一般模型及原理进行阐述.     

用Java JDK编写万维网服务的客户端应用

本文介绍使用JDK基础类库编写万维网服务的客户端应用，介绍了HTTP协议的基本内容以及使用Socket类和URLCConnection类实现包括下载文件，与CGI交互等应用。     

中文深度万维网数据库的现状研究

深度万维网(Deep Web)已成为万维网上十分重要的资源,是数据库领域的研究热点.目前已有的多数研究主要集中在深度万维网发现、查询接口集成以及查询结果处理等技术层面.然而对于这个超出表面万维网所涵盖信息数百倍的宝贵资源,人们目前还缺乏足够的了解和认识.对于一些基本问题,例如:(1)中文深度万维网的具体规模有多大;(2...     

搜索引擎中的网络数据挖掘技术

万维网包含大量的信息，而且随着其快速的增长而变得越来越复杂，这就导致了现在用户定位相关和高质量信息的搜索变得越来越难。将网络数据挖掘技术应用于搜索引擎将大大改善搜索引擎的搜索效率以及搜索质量。提出了具体的算法，并阐述了此算法在搜索引擎中的应用。     

基于Krpano的全景校园漫游的设计与实现

在数字校园建设和发展中,以虚拟全景校园漫游为基础的校园信息化平台能够为师生提供全新的沉浸式浏览体验,并提供更集中的信息交互功能。虚拟现实技术能够真实地再现现实环境,通过交互式操作,用户可以获得与真实环境相似的感受和体验,其中全景漫游是虚拟现实技术的一种典型应用。该文以南开大学滨海学院为实践区域,基于Krpano平台,利用Google Maps地图服务,采用全景图制作技术、SQL数据库技术和计算机网络技术搭建了一个虚拟全景校园漫游系统,并可跨系统、跨设备使用。系统实现了2D校园全景和谷歌地图信息服务功能,并提供了搭载陀螺仪传感器的可穿戴式VR设备使用的WebVR全景显示,满足了数字校园分布式、便于使用的需求。实践证明了基于Krpano框架设计能深度定制虚拟全景校园漫游系统的相关功能,能有效开发并拓展系统,并具有重要的实践意义。     

Projective virtual reality as a basis for on‐line control of complex systems‐not only‐over the internet

Already in 1994 the term Projective Virtual Reality was coined and a first implementation was used to control a complex multirobot system in Germany over the Internet from California. Building on this foundation, the general aim of the development of virtual reality technology for automation applications at the Institute of Robotics Research (IRF) today is to provide the framework for Projective Virtual Reality for a broad range of applications. The general idea of Projective Virtual Reality is to allow users to “project” actions carried out in the virtual world into the real world by means of robots or other means of automation. The framework is based on a task‐oriented approach which builds on the “task deduction” capabilities of a newly developed virtual reality system and a task planning component. The advantage of this approach is that robots which work at great distances from the control station can be controlled as easily and intuitively as robots that work right next to the control station. Robot control technology now provides the user in the virtual world with a “prolonged arm” into the physical environment, thus paving the way for intuitive control of complex systems over the Internet—and in general for a new quality of user‐friendly man‐machine interfaces for automation applications. Lately, this work has been enhanced by a new structure that allows one to distribute the virtual reality application over multiple computers on a network. With this new feature, it is now possible for multiple users to share the same virtual room, although they may physically be thousands of miles apart. They only need an Internet connection to share this new experience. Lately, the network distribution techniques have been further developed to not just allow users to cooperate over networked PCs but also to be able to set up a panorama projection or a cave running of a networked cluster of PCs. This approach cuts down the costs for such a high‐end visualization environment drastically and allows for a new range of applications. © 2005 Wiley Periodicals, Inc.     

Joint optimization of delay and cost for microservice composition in mobile edge computing

World Wide Web - With the development of software technology, some complex mobile and Internet-of-Things (IoT) applications can be constituted by a set of microservices. At present, mobile edge...     

Google Earth在旅游景点展示中的应用

在旅游信息网站中,利用虚拟现实技术进行景点展示取得的效果比使用文字和图片更生动。目前利用虚拟现实技术进行场景展示的3种主要方式为单机仿真软件、Web3D和全景图。该文提出一种利用Google Earth技术进行在线场景展示的方法,综合上述方式的优点,实现对大场景的加载、Internet对接以及与全景图的组合。该方法利用Servlet返回动态KML,激发Google Earth启动并显示场景。利用KML控制地标显示、地标说明图文和3D模型加载。通过说明图文中的超链接,让地标链接到全景图网页或Servlet,以返回3D模型数据。     

Virtual reality sports auxiliary training system based on embedded system and computer technology

Virtual Reality technology, the complex environment can be a simulated, traditional sports courses at the stadium, equipment, it is due to limitations such as safety, to provide scientific and accurate teaching and learning's, a complex by visualizing the theoretical knowledge in the abstract sport, you can get more technical knowledge. Compared to the traditional physical education activities, simulate sports scene only by generating VR panoramas that cannot be virtual reality technology. Based on this, you can improve the enthusiasm and athletic ability of students effectively. Because of immaturity and high-priced equipment of VR technology, at present, people that education is using unpopular making, carefully virtual reality technology. In this context, we can apply virtual reality technology to sports training, which can obtain more effective training effect. In the first part of this paper, we talk about the research of virtual reality panorama, the second part about the research of virtual reality video, the third part about the application of virtual reality in physical education teaching, and the fourth part is the conclusion and investigation process. In the study, VR, as a new technology, found that you have the prospect of a wide range of applications. As long as it has been used in scientific and rational, you can VR is to promote the level of improvement and sports greatly sports scene. Users can increase users' interest; it can be immersed in a variety of preset virtual locations. Therefore, in the VR device, which allows the user to improve the experience of the VR device, you can interact well in a virtual scene.     

The Two Instructional Faces of the Web

Abstract

The World Wide Web represents the final step in the evolution of the Internet as a tool worthy for practical applications in instruction. Two particular applications for the Web are discussed in light of projects which have been undertaken in the Helen Topping Architecture and Fine Arts Library at the University of Southern California. First, the World Wide Web may be used as a resource in the library. The Web is a source of content which, like all library resources, must be taught. It should be presented to users along with the same information literacy skills which must accompany any resource. Second, the Web may be used as a publishing tool where the content is created according to the particular instructional need or situation. This usage involves the technology of the Web rather than the content of the Web; this technology is the interface and access capabilities, either local or on a server, provided by the Web browser.     

VRMosaic: Web access from within a virtual environment

For the foreseeable future, users of virtual reality systems will likely spend more time in the “real” environment than in a virtual environment. In the “real” environment, users access much of their data using flat screen applications, which include tools such as authoring and analysis programs and even hyperlinked browsers. We believe that users will find VEs more appealing if they can import their flat screen applications. We also believe that the World Wide Web infrastructure, and supporting tools such as NCSA Mosaic, Netscape's Navigator, and Sun's HotJava, have become a de facto standard both for making data available and allowing limited interaction with that data. These beliefs motivated us to develop a technology for porting flat screen applications based on the 3.1 version of the InterViews toolkit into VR. NCSA Mosaic provided us with a real application that would: (1) test our infrastructure effectively; and (2) provide a compelling application example. We used our “2D interface in VR” infrastructure to port Mosaic into RealEyes, our VR system. Dubbed “VRMosaic”, this application lets users familiar with Mosaic access the Web from within an immersive VE. But VRMosaic is not just an embedded version of NCSA Mosaic-it also allows for VR specific features such as navigation within the VE     

Enhancing Web accessibility via the Vox Portal and a Web-hosted dynamic HTMLVoxML converter

Interactive voice browsers offer an alternative paradigm that enables both sighted and visually impaired users to access the World Wide Web. In addition to the desktop PC, voice browsers afford ubiquitous mobile access to the World Wide Web using a wide range of consumer devices. This technology can facilitate a safe, ‘hands-free' browsing environment which is of importance both to car drivers and various mobile and technical professionals. By providing voice-mediated access, information providers can reach a wider audience and leverage existing investment in their World Wide Web content. In this paper we describe the Vox Portal, a scaleable VoxML client, and a World Wide Web Server-hosted dynamic HTMLVoxML converter.     

Promondia: a Java-based framework for real-time group communication in the Web

The World Wide Web has evolved from a distributed hypertext system to a platform-independent graphical user interface that integrates many network services. So far, its technology has restricted it mainly to applications for information retrieval.As networks become ubiquitious and more and more users have a permanent connection, there is an increasing demand for other network services, such as real-time data feeds, group communication, and teleconferencing. So far, these services have been provided by various proprietary software systems, which were hard to set up and use, and thus not very successful.Integrating real-time group communication services into the World Wide Web is a natural way to make them more accessible and will take the Web a step further on its way to becoming the universal network application.In this paper, we describe functionalities required for these services and present an implementation based on Sun Microsystem's Java² programming language. We focus on the high-level functionalities and abstractions, but also describe an object-oriented programming model for group communication systems.     

WDAI: a simple World Wide Web distributed authorization infrastructure

The World Wide Web (W3) has the potential to link different kinds of documents into hypertext collections and to distribute such collections among many document servers. Distributed collections can bring forth new W3 applications in extranets and expand the concept of content reuse. However, they also bring new authorization problems, such as the need for coordinated user administration, user authentication, and revocation of rights. This paper proposes WDAI, a simple and general infrastructure for distributed authorization on the World Wide Web. Under WDAI, browsers and servers exchange authorization information using X.509v3-based authorization certificates. WDAI is designed to be open to a wide variety of security policies and, being compatible with existing W3 technology, can be implemented without modifying existing browsers.