基于VTK的医学图像三维可视化实现

利用VTK可视化工具包在Visual Studio2008平台上实现了医学序列图像三维的可视化．在对三维数据的预处理和优化基础上,在MFC实现的可交互界面上,用Marching Cubes（立方体移动）算法和Ray—casting（光线投射）算法对DICOM等格式的切片进行三维重建．     

Brief Communications:QTLNetworkR: an interactive R package for QTL visualization

QTLNetworkR is an R package that aims to provide a user-friendly and platform-independent tool to visualize quantitative trait loci (QTL) mapping results. The graphical functions of the QTLNetworkR are based upon lattice and grid packages, and the graphical user interface (GUI) of the QTLNetworkR is built upon RGtk2 and gWidgetsRGtk2 packages. Six functions are designed to help visualize marker interval, putative QTL, QTL-by- environment interactions, marker interval interactions, epistasis, and the predicted genetic architecture of complex traits. It is especially helpful in profiling results for multiple traits at multiple environments. The current version of QTLNetworkR is able to accept QTL mapping results from QTLNetwork, and it is ready for possible extensions to import results from some other QTL mapping software packages. In addition, we presented a QTL mapping result in rice (Oryza sativa) as an example to describe the features of QTLNetworkR.     

QTLNetworkR: an interactive R package for QTL visualization

QTLNetworkR is an R package that aims to provide a user-friendly and platform-independent tool to visualize quantitative trait loci (QTL) mapping results. The graphical functions of the QTLNetworkR are based upon lattice and grid packages, and the graphical user interface (GUI) of the QTLNetworkR is built upon RGtk2 and gWidgetsRGtk2 packages. Six functions are designed to help visualize marker interval, putative QTL, QTL-by-environment interactions, marker interval interactions, epistasis, and the predicted genetic architecture of complex traits. It is especially helpful in profiling results for multiple traits at multiple environments. The current version of QTLNetworkR is able to accept QTL mapping results from QTLNetwork, and it is ready for possible extensions to import results from some other QTL mapping software packages. In addition, we presented a QTL mapping result in rice (Oryza sativa) as an example to describe the features of QTLNetworkR.     

Research in interactive technologies at the Children's Television Workshop

This article presents a model for integrating research into the software design process, based on the experience of the Interactive Technologies Division of the Children's Television Workshop. The model has three components: (a) using existing research literature to inform initial design decisions and suggest possible issues to be tested during the development of prototype products, (b) conducting in-house basic research studies to provide information unavailable in the published literature, and (c) conducting formative research studies on products in development to assess their usability and to ensure their effectiveness as learning tools. Issues in interpreting published studies are considered, and insights from the results of basic and formative studies conducted by the Interactive Technologies Division are also reviewed.He attended Cornell and received his Ph.D. from Rutgers University in developmental psychology and research design in 1988.She holds a Ph.D. in developmental psychology from the University of Michigan and has been researching and producing software at CTW for seven years.     

基于VTK三维可视化编程

介绍了VTK特点、体系结构、对象模型等,着重描述图形对象、可视化对象、流水线和图像处理。针对医学图像需要,使用VTK开发了一个小型医学三维可视化软件。实验结果表明,与使用OpenGL相比,使用VTK可以节约大量时间,开发出的软件更加标准和规范。     

基于IMAGIS的校园房产三维可视化应用研究

运用GIS三维可视化软件IMAGIS的三维建模功能,以校园的二维数字线划图为基础,进行校园房产建筑物三维模型的构建,通过模型的生成、纹理映射及3DGIS虚拟漫游,实现校园房产的三维可视化.     

基于MATLAB的图形动画研究

借助于MATLAB强大的图形计算和绘制功能,研究图形的可视化问题,采用MATLAB提供的四种动画方式对解析几何中部分图形进行了动画设计.     

An investigation on the effects of using interactive digital video in a physics classroom on student learning and attitudes

Interactive digital video provides students with control of computer visualization techniques and allows them to collect, analyze, and model two-dimensional motion data. Activities that use these techniques were developed for students to investigate the concept of frames of reference in various real-life situations. This investigation examines the effect on student learning and attitudes of using these materials in an introductory college physics course. The study measured students' computer attitudes and found improvement in students' feelings of comfort in using computers after completion of the activities. We found students' prior computer experience did not influence their perceptions of the activities. The majority of participants perceived discussion and the computer visualization techniques as being very effective in helping them learn, Students' understanding of the physics concepts were assessed and the participants' scores were compared with nonparticipants' scores. Although analysis of variance statistical procedures revealed no significant differences between the two groups, the results of this study indicate that sophisticated instructional video software can be perceived as easy to use and effective by students who are novices and experts in using computers. Thus, interactive digital video tools and activities have the potential to provide physics teachers with the latest technology to bring the active process of learning physics to their classroom. © 1997 John Wiley & Sons, Inc. J Res Sci Teach 34: 467–489, 1997.     

用Delphi编程实现3DS MAX三维模型的读取

介绍了3DS Max建造的三维几何模型的ASE文件数据存储格式，说明了ASE文件的读取方法，结合OpenGL与Delphi开发出深海采矿作业系统可视化软件。     

Experimental evidence for improved neuroimaging interpretation using three-dimensional graphic models

Three-dimensional (3D) or volumetric visualization is a useful resource for learning about the anatomy of the human brain. However, the effectiveness of 3D spatial visualization has not yet been assessed systematically. This report analyzes whether 3D volumetric visualization helps learners to identify and locate subcortical structures more precisely than classical cross-sectional images based on a two dimensional (2D) approach. Eighty participants were assigned to each experimental condition: 2D cross-sectional visualization vs. 3D volumetric visualization. Both groups were matched for age, gender, visual-spatial ability, and previous knowledge of neuroanatomy. Accuracy in identifying brain structures, execution time, and level of confidence in the response were taken as outcome measures. Moreover, interactive effects between the experimental conditions (2D vs. 3D) and factors such as level of competence (novice vs. expert), image modality (morphological and functional), and difficulty of the structures were analyzed. The percentage of correct answers (hit rate) and level of confidence in responses were significantly higher in the 3D visualization condition than in the 2D. In addition, the response time was significantly lower for the 3D visualization condition in comparison with the 2D. The interaction between the experimental condition (2D vs. 3D) and difficulty was significant, and the 3D condition facilitated the location of difficult images more than the 2D condition. 3D volumetric visualization helps to identify brain structures such as the hippocampus and amygdala, more accurately and rapidly than conventional 2D visualization. This paper discusses the implications of these results with regards to the learning process involved in neuroimaging interpretation.     

Evaluation of an Augmented Reality Application for Learning Neuroanatomy in Psychology

Neuroanatomy is difficult for psychology students because of spatial visualization and the relationship among brain structures. Some technologies have been implemented to facilitate the learning of anatomy using three-dimensional (3D) visualization of anatomy contents. Augmented reality (AR) is a promising technology in this field. A mobile AR application to provide the visualization of morphological and functional information of the brain was developed. A sample of 67 students of neuropsychology completed tests for visuospatial ability, anatomical knowledge, learning goals, and experience with technologies. Subsequently, they performed a learning activity using one of the visualization methods considered: a 3D method using the AR application and a two-dimensional (2D) method using a textbook to color, followed by questions concerning their satisfaction and knowledge. After using the alternative method, the students expressed their preference. The two methods improved knowledge equally, but the 3D method obtained higher satisfaction scores and was more preferred by students. The 3D method was also more preferred by the students who used this method during the activity. After controlling for the method used in the activity, associations were found between the preference of the 3D method because of its usability and experience with technologies. These results found that the AR application was highly valued by students to learn and was as effective as the textbook for this purpose.     

复合材料热压罐成型工艺虚拟仿真实验设计

为了解决复合材料热压罐成型工艺实验高危、低效、高成本的难题,提高实验的交互性、实用性和覆盖面,利用Unity 3D、3D Studio Max和Maya等软件设计开发了复合材料热压罐成型工艺虚拟仿真实验,并依托于开放式虚拟仿真实验教学管理平台开放运行,将高危低效的热压罐成型实物实验教学转换为无危高效的虚拟仿真实验教学....     

基于三维图形思维拓展的三维动画课堂教学改革初探

目前国内的三维动画课程教学均以软件操作学习为主,过于重视三维技术的学习,忽略了对学生创造性思维的培养。所以,动画专业的课程教学需要进行有针对性的改革,并培养学生的艺术素养、激发学生的自我思考能力和三维图形思维拓展能力。文章通过对三维图形思维拓展概念的解读和三维课程课堂教学改革的初步探索,创造了三维图形思维拓展教学改革"三步走"的方法,分析了基于三维图形思维拓展的实践过程和效果,从而奠定了课堂改革的基础,确定了三维动画教学改革的方向。     

Exploring the phase space of a system of differential equations: different mathematical registers

We describe and analyze a situation involving symbolic representation and graphical visualization of the solution of a system of two linear differential equations, using a computer algebra system. Symbolic solution and graphical representation complement each other. Graphical representation helps to understand the behavior of the symbolic solution. Together with it, the symbolic solution and its analysis are needed to understand the graphical representation and to overcome the limiting constraints of the CAS. The study described in this paper points out the importance of flexibility in building connections between different mathematical registers, together with the fact that the balance between the usage of symbolic representations and of graphical representations can be very different from one student to the other. Research supported by Israel Science Foundation, grant number 1340/05.     

Real-time grouting monitoring and visualization analysis system for dam foundation curtain grouting

A real-time monitoring and 3D visualization analysis system is proposed for dam foundation curtain grouting. Based on the real-time control technology, the optimization method and the set theory, a mathematical model of the system is established. The real-time collection and transmission technology of the grouting data provides a data foundation for the system. The real-time grouting monitoring and dynamic alarming method helps the system control the grouting quality during the grouting process, thus, the abnormalities of grouting, such as jacking and hydraulic uplift, can be effectively controlled. In addition, the 3D grouting visualization analysis technology is proposed to establish the grouting information model (GIM). The GIM provides a platform to visualize and analyze the grouting process and results. The system has been applied to a hydraulic project of China as a case study, and the application results indicate that the real-time grouting monitoring and 3D visualization analysis for the grouting process can help engineers control the grouting quality more efficiently.     

基于MATLAB计算机辅助解析几何课程的数学实验

利用MATLAB辅助解析几何教学,借助编程实现解析几何中复杂图形可视化,实现解析几何课程的实验化。从实验中去学习几何一代数之间构建规律,培养学生数学思维,以及对于复杂图形计算机实现的过程,提高学生学习兴趣,达到良好的教学效果。     

Cepiah: a method for the design and evaluation of pedagogical hypermedia

CEPIAH is a method and a proposal for a Web‐based system to be used to assist teachers in designing multimedia documents and in evaluating their prototypes. The proposed tool integrates two modules: one for the Evaluation of Multimedia Pedagogical and Interactive software (EMPI), and the other, a method for designing pedagogical hypermedia (SP/UL/FC). The two modules are presented along with applications of distance teaching (and distance learning) and with comments about the first results of this experiment. A short presentation of a third module serves as a conclusion.     

Learning in Stereo: The Relationship Between Spatial Ability and 3D Digital Anatomy Models

Three-dimensional (3D) digital anatomical models show potential to demonstrate complex anatomical relationships; however, the literature is inconsistent as to whether they are effective in improving the anatomy performance, particularly for students with low spatial visualization ability (Vz). This study investigated the educational effectiveness of a 3D stereoscopic model of the pelvis, and the relationship between learning with 3D models and Vz. It was hypothesized that participants learning with a 3D pelvis model would outperform participants learning with a two-dimensional (2D) visualization or cadaveric specimen on a spatial anatomy test, particularly when comparing those with low Vz. Participants (n = 64) were stratified into three experimental groups, who each attended a learning session with either a 3D stereoscopic model (n = 21), 2D visualization (n = 21), or cadaveric specimen (n = 22) of the pelvis. Medical and pre-medical student participants completed a multiple-choice pre-test and post-test during their respective learning session, and a long-term retention (LTR) test 2 months later. Results showed no difference in anatomy test improvement or LTR performance between the experimental groups. A simple linear regression analysis showed that within the 3D group, participants with high Vz tended to retain more than those with low Vz on the LTR test (R² = 0.31, P = 0.01). The low Vz participants may be cognitively overloaded by the complex spatial cues from the 3D stereoscopic model. Results of this study should inform resource selection and curriculum design for health professional students, with attention to the impact of Vz on learning.     

智能频谱感知可视化系统设计与实现

为了实现对频谱资源的科学、有效管理,提高频率利用率,设计并实现了基于Android平台的智能频谱感知可视化系统。采用MVC软件模式进行系统框架设计,以实现整体系统结构的高内聚、低耦合。系统架构设计包含监测设备端、服务器端、客户端、百度地图4部分,服务器端对采集到的频谱数据进行FFT（快速傅里叶变换）,并保存在MySQL数据库中,以方便用户对历史频谱数据的查询与分析。服务端与客户端采用安全性较高的C/S模式进行数据交互,以保障频谱信息的安全性。客户端采用成熟的SurfaceView和Opengl ES技术绘制二维、三维频谱图,以丰富应用程序的可视化功能,提升用户体验。实际应用结果表明,系统运行效果良好,对监测区域的频谱使用情况能进行直观的可视化呈现,可有效帮助监管部门了解监测范围内的频谱占用情况。     

Analysis of digenic epistatic effects and QE interaction effects QTL controlling grain weight in rice

INTRODUCTIONKilo-grainweight,characteristicallyacom-plextrait,isanimportantcomponentofyieldinrice.QTLmappingforkilo-grainweightofricewascon-ductedusingpopulationsofF2(Linetal.,1996),doubledhaploidlines(Luetal.,1997),recombi-nantinbredlines(Xiaoetal.,1996),backcrosstestcross(Xiaoetal.,1995;Lietal.,1997)andratoonedF2(Lietal.,2000).Consideringthesen-sitivityofkilo-grainweighttoenvironments,Luetal.(1997)andZhuangetal.(1997)comparedthedifferentialdetectionofQTLacrossenvironmentstodetermin…