虚拟实验环境中的实体及其建模

虚拟实验的元器件模型通过用数学模型来代替物理上存在的具体的物理器件,这种数学模型应该能够正确的反映器件的物理特性和电学特性,且便于在计算机上作数值计算。文章分析了虚拟实验环境中的虚拟实体的特性和行为特征,提出了一种虚拟实验的建模分类方法与虚拟元件的建模方法,将元器件的建模分为基于正向操作模型建立和基于逆向操作的模型建立,并通过分析电子实验的特点,探讨了电子实验的元件建模方法和元件的模型的类结构图,建立了电子实验的元件的模型类体系结构,并分析了这种建模方式的特点和优缺点。     

大学物理仿真实验教学系统中霍尔效应虚拟实验课件的设计实现

霍尔效应虚拟实验课件采用面向对象技术实现实验场景及仪器的数值建模与图像建模,用逼真的三维图片和事件驱动方式实现场景和仪器的界面及操作仿真,实现了可设计性、操作的任意性和具有真实感的交互功能,使学生能像操作真实实验一样操作它,产生浓厚的兴趣,达到良好的教学效果。     

图形和图像构建虚拟场景技术研究

阐述了图形和图像混合型构建虚拟场景的基本思想,对虚拟场景中的不同对象采用不同的处理方式,场景总体的全景视觉效果由基于图像的技术生成,主要利用了反映真实场景的高质量的图像,在无须复杂建模的情况下取得最真实的感官效果;对于场景中与用户交互部分则利用几何模型的方法来处理,对虚拟环境中用户要与之交互的对象进行几何模型构建,这样可以提高用户的沉浸感。对图形和图像建模型的两种不同方法进行了比较,研究了既提高场景真实感．又能加快渲染速度的混合建立场景的方法。     

虚拟实验中虚拟建模技术分析

论述了虚拟实验与虚拟现实技术的基本概念与原理.重点讨论了虚拟建模的方法,主要介绍了虚拟实验中形状和纹理建模、动态建模、交互建模、动作行为建模的思想和方法.同时,建立了一个虚拟实验的虚拟模型.     

虚拟电路实验的一种建模方法

本章文分析了虚拟实验环境中的虚拟电路实验元器件的建模方法，提出了一种新的电路元器件建模方法，将元器件的建模分为三部分构成，即几何建模，行为建模，物理建模，并分析了这种建模方式的特点和优缺点。     

基于虚拟维修的CAD-VR建模及优化技术研究

虚拟维修样机建模是开发虚拟维修训练系统的首要和关键性问题。本文分析了基于虚拟维修的CAD-VR模型的建模思路和建模要求,分别从几何建模、物理建模、模型转换、模型优化等方面探讨了某型导弹战车建模及模型优化关键技术,所建立的样机模型已成功在某型导弹战车虚拟维修训练系统中得到了应用。     

虚拟人和衣服运动的自动建模

随着3维图像获取技术的提高，高度真实细节的虚拟人体模型在图形学中已很常见。这些模型数据庞大，结构复杂，需要大量的处理，这无疑为自动建立这些具有高度真实细节的虚拟人体的可动(肢架)模型提出了新的挑战。本文着重就虚拟人体可动模型的自动获取技术进行了回顾，对各种虚拟人体自动建模方法进行了详尽的探讨、比较和总结。     

虚拟实景对象建模与表现

虚拟对象是指物体的数字化外观仿真模型,与基于图形的虚拟对象相比,基于图像的虚拟对象具有绘制速度与物体复杂度无关、实时性强、可轻易达到相片级的视觉表现效果以及建模简单等特点,在许多领域都具有广泛的应用前景.传统的基于图像的虚拟对象建模需已知相机参数或图像深度信息,建模繁琐复杂.针对该问题,提出一种可实用的基于图像的虚拟对象简化模型--虚拟实景对象,对该模型建模只需围绕待建模物体周围采集一圈实景图像,无需已知相机参数或图像深度信息,表现时则采用视图合成方法来合成未采集图像视点的虚拟视图,从而实现对物体的连续自由观察.实验结果表明,该方法不仅建模过程简单,而且可以实现对虚拟对象的360度连续自由操纵.     

基于OSG的虚拟化学实验平台的构建设计

为了突破虚拟化学实验平台在智能和可扩展方面的限制,基于开源软件OSG(OpenSceneCraph)的技术特点,设计了三维虚拟化学实验平台.给出了利用OSG实现虚拟实验平台的框架、实现过程和功能结构,特别提供了对虚拟实验操作结果的模糊评价功能.研究了化学反应的实验现象和过程,提出了化学建模,建立了化学实验模型库;提出了化学实验的智能识别机制,综合判别仪器组合、实验药品、反应条件和与之匹配的方程式,实现了智能识别实验类型和渲染实验结果.最后通过一个实例结表明了该实验平台的可行性,并将该平台与其它平台进行比较,表明了该平台操作的灵活性和设计的优越性,为化学实验学习提供了及时、有效的支持.     

装备虚拟操作训练的过程建模方法研究

针对装备虚拟操作训练系统中对过程建模的研究仅停留在针对具体仿真任务的应用技术层面,缺乏深入的建模理论研究的现象;首先分析了虚拟操作训练仿真目的和装备操作的特点,叙述了过程模型在虚拟操作训练中的重要性;然后提出了一种面向操作训练的过程建模方法及其实现方法,为虚拟操作训练系统过程建模提供了理论支撑;基于此过程建模方法开发的“某型防空高炮虚拟操作训练系统”验证了建模方法的可行性.     

Microsoft Access 2000数据库在《物理化学实验》数据处理系统中的应用

Microsoft Access 2000数据库是办公软件Microsoft office的一部分,与办公软件的共同特色是VBA界面。针对“物理化学实验数据处理软件”无实验数据存储和管理功能的问题,采用Microsoft Access 2000数据库以开发,使“物理化学实验数据处理系统”增加了存储和管理的功能,从而提高实验教学的质量。     

Function-based visualization and haptic rendering in shared virtual spaces

We seek to further expand the collaborative potential of shared virtual spaces by using haptic force-feedback. We propose how to define tangible physical properties of the objects, together with their geometry and appearance, by using mathematical functions. We illustrate this concept by developing software which allows us to touch and feel surfaces of VRML and X3D objects, convert them to solid objects, as well as create any other solid objects using the function-based extension of VRML and X3D. We define geometry, appearance and tangible physical properties of the solid objects by implicit, explicit and parametric functions straight in the VRML/X3D code or in loadable libraries. Since the function-defined models are small in size, it is possible to perform their collaborative interactive modifications with concurrent synchronous visualization at each client computer with any required level of detail. We illustrate the proposed models with several application examples.     

基于虚拟仿真软件技术的计算机网络实验教学体系

提出了基于虚拟仿真软件技术的计算机网络实验教学体系.该体系是在传统的计算机网络实验教学体系中引入虚拟化软件技术,可进而搭建验证性或综合性的网络实验平台.按照不同的实验类别来选择相应的虚拟仿真软件.这些虚拟仿真软件可以虚拟仿真各种类型的技术先进的真实物理设备、构建仿真的实验环境、快速恢复实验环境,对物理设备不会造成损害.     

On the development of software support for solving problems of optimal design of power boilers

Power boilers are complicated technical objects consisting of a large number of interconnected components. Main problems of creating mathematical models and software support for optimal design of power boiler units are analyzed, approaches to the solution of them are described, and distinctive features of their software implementation are considered. Results of testing software are considered.     

Multisim 10仿真软件在模拟电路实验教学中的应用

文章详述了Multisim 10在模拟电路实验教学中的具体应用,通过教学实例说明该软件在模拟电路实验教学中的应用方法及实际意义。实践表明,采用Multisim进行模拟电路实验教学,可快速、准确地对电路性能进行仿真分析,提升了电路实验设计质量,节省了实验仪器设备,使实验内容更加完备,教学效果良好。     

大学化学实验智能化辅助教学与管理系统

根据大学化学实验教学目标和要求,用Bcb5.5编写了大学化学实验智能化辅助教学与管理系统软件,它不仅可用于单一实验和综合性实验的辅助教学,而且可按需要进行智能扩充。该软件集实验预习及指导、数据采集和处理、成绩评定及查询、实验项目智能扩充及相关信息管理于一体,界面友好、易于使用。     

RFID-based interactive multimedia system for the children

In this paper, we present an interactive edutainment system for the children that leverages multimedia and RFID technologies in a seamless manner. The proposed system allows children to learn about new objects/entities by tapping on physical objects through a specially designed RFID-Bluetooth based Tangible User Interface (TUI) tool. The output of the system is delivered as a set of appropriate multimedia representations related to the objects being tapped. The TUI uses RFID technology for object identification and Bluetooth communication to transmit data to the computer where the system??s software is running. We incorporated our system in three games that allow children of different ages to benefit from the system??s functionalities and encourage them to interact with it.     

Compulab—Computing for the physical sciences teaching laboratory

In this paper a general purpose microcomputer-based system is described which is designed to support small-scale experimentation in the student laboratory. It comprises a low-cost hardware interface and a generalised software user-interface. The software provides a user-driven scientific workbench tool for the collection, analysis, display and storage of experimental data. Although designed initially for the physical sciences, it also has application in the life sciences.The requirements for such a system are discussed, design criteria are established and examples are given of the application of the system to some simple experiments. Experiences in using the system with teachers and school and college students contributed significantly to the development and indicate some of the desirable features for such software.The benefits of the general-purpose computer-assisted approach to experimentation in the teaching laboratory are both financial and pedagogical. However, there is a need to revise methods of laboratory teaching if these benefits are to be realisable.     

Learning object deformation models for robot motion planning

In this paper, we address the problem of robot navigation in environments with deformable objects. The aim is to include the costs of object deformations when planning the robot’s motions and trade them off against the travel costs. We present our recently developed robotic system that is able to acquire deformation models of real objects. The robot determines the elasticity parameters by physical interaction with the object and by establishing a relation between the applied forces and the resulting surface deformations. The learned deformation models can then be used to perform physically realistic finite element simulations. This allows the planner to evaluate robot trajectories and to predict the costs of object deformations. Since finite element simulations are time-consuming, we furthermore present an approach to approximate object-specific deformation cost functions by means of Gaussian process regression. We present two real-world applications of our motion planner for a wheeled robot and a manipulation robot. As we demonstrate in real-world experiments, our system is able to estimate appropriate deformation parameters of real objects that can be used to predict future deformations. We show that our deformation cost approximation improves the efficiency of the planner by several orders of magnitude.     

Software Component Models

Component-based development (CBD) is an important emerging topic in software engineering, promising long-sought-after benefits like increased reuse, reduced time to market, and, hence, reduced software production cost. The cornerstone of a CBD technology is its underlying software component model, which defines components and their composition mechanisms. Current models use objects or architectural units as components. These are not ideal for component reuse or systematic composition. In this paper, we survey and analyze current component models and classify them into a taxonomy based on commonly accepted desiderata for CBD. For each category in the taxonomy, we describe its key characteristics and evaluate them with respect to these desiderata.