SVG数字高程模型生成与3D可视化方法

可缩放矢量图形(SVG)不支持3D模型的建立,为此,介绍SVG扩展元素的实现原理,研究在SVG的3D模型建立方法,利用三角网格差分方法解决元素不支持点数不一致、非均匀对象分布的问题,在SVG中建立3D数字高程模型,并对其实现在线旋转控制。对内嵌JS和Java后台程序生成DEM的方案进行比较,结果表明,内嵌JS方案的时间消耗较大,有必要扩展SVG标准中的3D表示标签。     

Java3D API与Java3D编程技术

Ｊａｖａ３Ｄ ＡＰＩ是应用于３Ｄ图形编程的Ｊａｖａ类包,本文具体介绍Ｊａｖａ３Ｄ ＡＰＩ中主要类的使用,Ｊａｖａ３Ｄ编程模式和显示模式,阐明了Ｊａｖａ３Ｄ编程的思路和方法。     

Java3D在钢结构建模中的应用

Java3D是基于Java平台的、功能强大的面向对象的三维图形应用程序接口(API)，它的设计是对目前流行的诸如OpenGL和Direct3D的3D图形API的重大革新。利用Java3D能使三维建模变得更加快捷和清晰。该文就如何应用Java3D建立三维钢结构模型进行了初步的探讨。     

Java 3D—Java语言的三维图形解决方案

Java 3D是一种新型的三维图形编程方案,结合Java语言,在开发Internet及WWW上的三维图形网络应用有极大优势。本文介绍了Java3D API的特点,并结合一个利用Java 3D开发的实例说明其结构与编程模式。     

Java 3D, 3D graphical environments and behaviour

A brief outline of the structure of the Java 3D API as a means of producing graphical environments is provided. We then go on to examine issues in the development of a behaviour rich scene, in particular the issues of scene animation and collisions between scene objects. The animation issue is examined first, where issues of timing and architecture are considered. The Java 3D requirements for, and view of, collision are discussed next from a general perspective, identifying several problems with the implementation. Four simple scenes using animation and collision detection are examined. In each case a number of difficulties have been identified, partly related to the responsiveness of the operating system in the case of animation, but particularly due to the view and implementation of the collision detection system provided. Collisions often involve modifications to the states of all objects involved in the collision and some of the issues this raises in the context of Java 3D's provision are examined and reported on. Finally, we finish with a summary of our findings and conclusions on the suitability of Java 3D for building environments. Copyright © 2002 John Wiley & Sons, Ltd.     

WebFlow – a visual programming paradigm for Web/Java based coarse grain distributed computing

We present here recent work at NPAC aimed at developing WebFlow – a general purpose Web-based visual interactive programming environment for coarse grain distributed computing. We follow the 3-tier architecture with the central control and integration WebVM layer in tier-2, interacting with the visual graph editor applets in tier-1 (front-end) and the legacy systems in tier-3. WebVM is given by a mesh of Java Web servers such as Jeeves from JavaSoft or Jigsaw from MIT/W3C. All system control structures are implemented as URL-addressable servlets which enable Web browser-based authoring, monitoring, publication, documentation and software distribution tools for distributed computing. We view WebFlow/WEbVM as a promising programming paradigm and co-ordination model for the exploding volume of Web/Java software, and we illustrate it in a set of ongoing application development activities. © 1997 John Wiley & Sons, Ltd.     

Java 3D在数控仿真中的运用

文章对网络图形建模语言(Java 3D)进行了研究,通过Java 3D构建三维世界,并在网页上显示三维图像,用Java 3D的图形技术,把转换形成的图形格式直接用于仿真之中,不需要利用编程方式进行建模。使得数控加工仿真技术达到缩短加工编程的周期、提高生产效率、降低生产成本的意义。     

基于Java3D的立体显示技术及其在仿真中的应用

提出用虚拟环境建模API Java3D产生场景左右眼图像的关键技术，以及用Java3D如何控制影响立体显示效果的主要因素，这些主要因素是左右图像视差、虚拟眼睛视场宽度和虚拟眼睛到显示平面的距离。这些技术已成功应用于Java3D开发的汽车驾驶仿真系统中以实现立体显示。这些技术为用Java3D开发视景仿真系统和三维立体视觉游戏软件提供支持。     

VRML与Java 3D转换关键技术的研究

主要研究在虚拟网络服务领域,使用Java语言来实现由VRML标准描述的三维CAD模型（或其它三维模型）到Ja-va3D的转换。生成Java3D标准三维模型,使用户可以通过浏览器进行浏览和个性化配置,该技术对虚拟商务的发展将有极大的推动作用。由于系统的复杂性,本文仅对系统中的转换这一关键技术进行研究。     

面向Java 3D的CAD模型简化与转换

三维图形仿真的一个重要工作就是建立三维模型,若使用已有的模型可以节省一定的时间.文中主要讨论了如何将复杂的CAD模型应用于Java3D建立的图形仿真系统中.首先,对已有的Pro/E模型进行简化,以VRML格式导出,有两种方式应用于Java3D中.一种是直接编辑Pro/E模型导出的VRML格式文件,组织模型之间的链接关系;另一种是将Pro/E模型导出的VRML格式文件导入到3DMax中组织链接关系,然后导出为单一文件.最后联合使用这两种方式将一个复杂的空间机器人模型导入到Java3D,提高了图形数据的重用性和开发的快速性,经实践验证效果理想.     

A semantic model of confinement and Locality Theorem

Confinement is required in object-oriented programming in order to protect sensitive object references. Recently a range of confinement schemes have been proposed to achieve object encapsulation by defining static type systems, but unavoidably, with strong restrictions. On the other hand, no similarity in concepts makes assessing of these schemes a difficulty. We build in this paper a semantic model for confinement in μJava, a subset of sequential Java that offers most objectoriented features. This model has limited restriction for programs. From a semantic view, confinement is defined with respect to a given context that specifies partition of the object pool and confinement constraint among them. Moreover, we present the main Locality Theorem for checking well confinement of programs locally. By applying this Theorem, we have solved a security breach problem from Java JDK 1.1.1, and furthermore, proved the soundness of two widely used confinement schemes: confined types and ownership types.     

基于Java 3D技术和Swing技术的3D建模开发

该文介绍了基于Java技术中的Java3D技术和Swing技术的3D建模的开发。和其他技术开发3D模型相比,利用Java技术的面向对象技术开发的3D模型有着很多优势。比如,此3D模型支持多平台操作,适合编写非常复杂的应用程序。利用Java3D技术实现了盛放3D模型的基础类的开发,同时通过和Swing技术的合理结合实现了3D组件的用户图形界面化、用户操作简易化的特色。利用Java技术还克服了编程代码冗长、繁杂不利于管理这个技术难点。同时利用了Java技术的事件监听处理功能实现了对3D模型的编辑功能。优化了编程工作。文中以此3D组件在石油数值模拟软件中的应用为例说明了该组件具有的特色。     

基于Java与Flex的科技计划项目管理系统实现

主要介绍了利用Flex与Java的集成构建,实现科技计划项目管理系统的方法,包括业务层的实现,表示层中模型的实现、控制器的实现、视图的实现,数据持久层的实现以及LCDS的实现方法.     

A semantic model of confinement and Locality theorem

Confinement is required in object-oriented programming in order to protect sensitive object references. Recently a range of confinement schemes have been proposed to achieve object encapsulation by defining static type systems, but unavoidably, with strong restrictions. On the other hand, no similarity in concepts makes assessing of these schemes a difficulty. We build in this paper a semantic model for confinement in μJava, a subset of sequential Java that offers most object-oriented features. This model has limited restriction for programs. From a semantic view, confinement is defined with respect to a given context that specifies partition of the object pool and confinement constraint among them. Moreover, we present the main Locality theorem for checking well confinement of programs locally. By applying this theorem, we have solved a security breach problem from Java JDK 1.1.1, and furthermore, proved the soundness of two widely used confinement schemes: confined types and ownership types.     

基于项目式的《Java 程序设计》课程改革实践

针对Java 课程的特点和性质,利用Java 项目在应用型本科院校的实践,系统地阐述了在教学案例、教材建设、 教学资源等方面进行实践的过程。基于项目式的Java 教学方法为学生学习程序设计课程提供了好的解决方案。     

基于Web3D的虚拟场景漫游的设计与实现

介绍了Java3D与VR相结合的Web3D应用;采用了三层式的Client/Server结构和分布计算模型设计系统体系结构,提出了在Java3D中获取场景对象实例的方法,给出了在Java3D场景中实现虚拟场景中漫游的方法。采用Java3D实现与用户交互虚拟三维场景,并给出了部分实现细节。     

基于Web3D的虚拟场景漫游的设计与实现

介绍了Java3D与VR相结合的Web3D应用；采用了三层式的Client／Server结构和分布计算模型设计系统体系结构，提出了在Java3D中获取场景对象实例的方法，给出了在Java3D场景中实现虚拟场景中漫游的方法。采用Java3D实现与用户交互虚拟三维场景，并给出了部分实现细节。     

一种新的Java存储模型L-JMM

Java存储模型是Java语言和Java虚拟机研究中的核心关键部分,目前Java语言规范中的存储模型不能保证Java技术所必需的语义特性,而且不利于Java虚拟机的性能优化.提出了一种新的Java存储模型,该模型取消了规范中Java存储模型中对存储密致性的要求,保证了Location一致性;同时根据Java语义的要求,对Java语言中不同类型的变量详细规定了多线程存储操作的行为规则.该模型不仅能保证Java程序的正确性,同时能有效提高Java程序的运行效率.最后通过仿真实验验证了该存储模型的关键特性.     

基于MVC设计模式的Struts框架及其应用的研究

Struts是基于MVC设计模式的非常优秀的Web应用框架,在Web应用开发中很好地将显示和逻辑分离,提高了代码的可重用性和灵活性。文中首先分析了Struts框架结构及其对Model,View和Controller层的实现原理,并总结了Struts框架的优点,然后给出了采用Struts框架的一个应用实例的实现过程,在应用实例业务逻辑的实现过程中采用了Jbas技术,实现Java代码与数据库操作代码(SQL语句)的分离。