Visualizing and analyzing dynamic meteorological data with virtual globes: A case study of tropical cyclones

Visualization is an important component of the evaluation of meteorological models, forecasting research, and other applications. With advances in computing power, the volume of meteorological data generated by geoscience and climate researchers has been steadily increasing. The emerging technique of virtual globes has been regarded as an ideal platform for visualizing larger geospatial data over the Internet. To visualize and analyze meteorological data with the new virtual globes, this paper proposes a systematic meteorological data visualization (MDV) framework in World Wind, an open-source virtual globe. The key technologies, including a hierarchical octree-based multiresolution data organization, data scheduling, level of detail (LOD) and rendering are described in detail. The framework is then applied to a practical tropical cyclone simulation, including flow vectors, particle tracking, cross-sectional analysis, streamlines, pathway animation, and volume rendering. The results show that virtual globes are effective tools for meteorological data visualization and analysis.     

Visualization experience and related process modeling

The visualization process is a transformation of information content into knowledge via a visual representation. Visualization experience, proposed herein, reflects human sensations arising during the visualization process. It provides a basis in which to objectively measure and evaluate human participation in the visualization process; and thereby provides methods of control. Visualization experience modeling allows leveraging on the natural environment to augment understanding, therefore improve decision making. The application emphasis in this paper is on the theoretical development of visualization experience in the visualization process as applied to Ambient Assisted Living and Clinical Decision Support Systems.     

Assisting comprehension of animation programs through interactive code visualization

Visual languages have been widely used to help people create animation programs. However, current programming environments lack features supporting efficient code exploration and program comprehension, particularly for understanding relationships among parts of animation programs. In this paper, we present novel interactive visualizations aimed at helping people to understand animation programs. We conducted an empirical study to evaluate the impact of these visualizations on programmer comprehension of the code, showing that our approach enabled programmers to comprehend more information with less effort and in less time. This result is potentially significant because it demonstrates an approach for helping users to explore and understand animation code. We anticipate that this approach could be applied in a wide variety of animation programming tools, which could ease common animation programming tasks that require understanding code.     

Creating and evaluating a particle system for music visualization

In this paper, we present a simplified 3D particle system and fast translation algorithm we have designed and implemented to generate real-time animated particle emitter fountains choreographed by a classical music. The approach we used to translate and map the controlling information into the musical fountain animation is also introduced, as well as the process to build the physical model of the music fountains. A proof of concept is implemented to demonstrate the main system's aspects, its feasibility, and that it has met the system's design goals. Moreover, it shows that is possible to observe visual patterns that match the theme of the musical composition, as an example of how the system can be used not only for visual appreciation and entertainment, but also as a possible support tool for music composition. We have also conducted a user study as an evaluation of the system. The results of this have provided us with positive and useful feedback on the effectiveness of our visual mappings as well as further directions to explore.     

基于MatLab环境的高等数学可视化

将高等数学与计算机(MatLab工具)结合起来,利用现代科技手段,动态演示高等数学的抽象问题,使高等数学理论、概念不再抽象难懂,提高学生运用先进的数学工具学习高等数学的能力,且有利于培养学生学习数学的兴趣和数学应用意识。     

一道数字排列题算法演示的C#实现

编程解决实际问题,不仅通过大量的编程实践,掌握一定的编程技巧,同时也需要找到解决问题的正确方案。通过一道数字排列题的解决演示,灵活运用C#语言编程实现该问题算法的可视化演示。     

一种HeatMap技术可视化GIS三维数据方法

根据HeatMap的基本思路,提出了把热点的浓度参数作地理要素数值并作线性拉伸,以表达出三维数据值的大小变化特征的方法,对比试验表明,其方法具有较好的可视化效果。     

Performance analysis challenges and framework for high-performance reconfigurable computing

Reconfigurable computing (RC) applications employing both microprocessors and FPGAs have potential for large speedup when compared with traditional (software) parallel applications. However, this potential is marred by the additional complexity of these dual-paradigm systems, making it difficult to identify performance bottlenecks and achieve desired performance. Performance analysis concepts and tools are well researched and widely available for traditional parallel applications but are lacking in RC, despite being of great importance due to the applications’ increased complexity. In this paper, we explore challenges and present new techniques in automated instrumentation, runtime measurement, and visualization of RC application behavior. We also present ideas for integration with conventional performance analysis tools to create a unified tool for RC applications as well as our initial framework for FPGA instrumentation and measurement. Results from a case study are provided using a prototype of this new tool.     

基于VB的可视化数据库集成器的开发

为了实现多种异构数据库之间的互操作,提供一个可视环境下进行异种数据库互操作的软件,本文选择了Visual Basic 6.0作为开发环境,利用VB提供的一些实用工具,开发了一个小型的可视化数据库集成器软件。     

基于表层剥离原理的传递函数设计

针对体绘制领域目前存在的计算开销、经验提取和复杂人工干预等几个重要的应用问题,提出了传递函数设定的表层剥离算法。表层剥离算法通过单程交越检测和高梯度比例边缘检测,解决了表层起伏现象导致的分类误差较大,需要复杂的人工干预调整的问题;避免引入高阶偏导等复杂的计算,保持了较低的计算开销;而且形成了一种简单且能发挥用户直觉,具有较高自动化成分的传递函数设定方式,取得了较好的效果。据此开发的普及型医学图像分析系统验证了算法的有效性。