基于相密度的混沌吸引子可视化方法研究

针对以往混沌子可视化方法法存在的某些局限,提出了相密度定义从而对吸引子在相空间中的分布情况进行了全局性的定量描述,并为混沌吸引子可视化提供了有效的参考与控制,另外,基于相密度实现的混沌吸引子体绘制可视化方法与Lyapunov谱特征可视化方法,还从不同角度揭示了混沌行为的整体变化情况以及局部相空间中混系统的基本特征,并在丰富混沌吸引子可视化内容与形式的同时,降低了可视化过程的复杂性。     

An experiment on the role of graphical elements in architecture visualization

The evolution and maintenance of large-scale software systems requires first an understanding of its architecture before delving into lower-level details. Tools facilitating the architecture comprehension tasks by visualization provide different sets of configurable, graphical elements to present information to their users. We conducted a controlled experiment that exemplifies the critical role of such graphical elements when aiming at understanding the architecture. In our setting, a different configuration of graphical elements had significant influence on program comprehension tasks. In particular, a 63% gain in effectiveness in architectural analysis tasks was achieved simply by changing the configuration of the graphical elements of the same tool. Based on the results, we claim that significant effort should be spent on the configuration of architecture visualization tools and that configurability should be a requirement for such tools.

Analyzing and visualizing multiagent rewards in dynamic and stochastic domains

The ability to analyze the effectiveness of agent reward structures is critical to the successful design of multiagent learning algorithms. Though final system performance is the best indicator of the suitability of a given reward structure, it is often preferable to analyze the reward properties that lead to good system behavior (i.e., properties promoting coordination among the agents and providing agents with strong signal to noise ratios). This step is particularly helpful in continuous, dynamic, stochastic domains ill-suited to simple table backup schemes commonly used in TD(λ)/Q-learning where the effectiveness of the reward structure is difficult to distinguish from the effectiveness of the chosen learning algorithm. In this paper, we present a new reward evaluation method that provides a visualization of the tradeoff between the level of coordination among the agents and the difficulty of the learning problem each agent faces. This method is independent of the learning algorithm and is only a function of the problem domain and the agents’ reward structure. We use this reward property visualization method to determine an effective reward without performing extensive simulations. We then test this method in both a static and a dynamic multi-rover learning domain where the agents have continuous state spaces and take noisy actions (e.g., the agents’ movement decisions are not always carried out properly). Our results show that in the more difficult dynamic domain, the reward efficiency visualization method provides a two order of magnitude speedup in selecting good rewards, compared to running a full simulation. In addition, this method facilitates the design and analysis of new rewards tailored to the observational limitations of the domain, providing rewards that combine the best properties of traditional rewards.     

结构状态智能模拟方法初探

该方法结合信息处理智能技术、科学计算可视化技术、计算机动态模拟及仿真技术、基于XML的可视化接口技术、软构件技术及工程数据库等技术,充分将先进的计算机科学技术与土木工程领域的结构分析与优化相结合,使其不仅能有效直观地反映问题,有效地辅助结构分析与优化,而且能够解决传统方法因数据不足或干扰给结构分析带来的困难,为结构受力动态分析及系统健康监测提供了先进的技术手段。提出了结构状态智能模拟环境的基本框架,并介绍了关键技术的应用。     

空间数据挖掘知识的地图可视化表达*

通过分析空间数据挖掘所能发掘的知识类型,对发掘出的知识表达方式进行了研究,提出地图是空间数据挖掘规则和知识的可视化表达的优秀和成熟的表示方法,并对如何表达进行了探讨。     

潮流场中质点运动的可视化*

提出了一种适用于非结构化网格系统中质点运动轨迹的跟踪算法。利用数值计算方法的稳定性限制条件对质点位置的搜索算法进行了优化,极大地降低了算法的时间复杂度,提高了计算效率。用Visual Fortran语言实现了质点运动的动态显示。将其用于渤海潮流场中质点运动规律的研究,初步得出了渤海中质点运动和水交换的一些规律。     

Auto-scanning and visualizing system for the acoustic field of transducer

This paper presents an automatic scanning and visualizing system for ultrasound field of a planar piston transducer. This system consists of a water tank with wedge absorber, stepper motors driver, system controller, a planar piston transducer, a needle-type hydrophone and data processing software. Our software realizes the processing and displaying of ultrasonic data, which are acquired by adjusting accurately positions of the hydrophone and transducer that are driven by stepper motors. And the ultrasonic field is represented by employing 1D, 2D or 3D graphs of data, respectively. Experimental results show that this auto-scanning and visualizing system provides a more spatial structure of ultrasonic field and reveals a more characteristic of ultrasonic beam radiated by the planar piston transducer.     

Significance of the dimensional view for visualizing relevant aspects of a production system in a co-operative planning process

Pictorial visualization is expected to facilitate communication between industrial professionals when planning working environments and production systems. This hypothesis was investigated by studying how 24 participants including managers, supervisors, machine operators, and occupational health and safety officials, judged three types of computer animated visualization varying in dimensional view (scale and scope of a production line):shop floor view/survey of shop floor; production unit view/semi-survey of production unit; and workplace view/close-up of workplace, in relation to a set of planning issues. The participants participated in a controlled 2-day planning workshop, redesigning a fictitious manufacturing process by means of computer graphics, and then responded to a questionnaire. It can be concluded that shop floor view as well as production unit view are significant for survey planning issues, while all 3-dimensional views are significant for close-up planning issues. Analogously, all dimensional views are significant for technocentric planning issues, whereas only the workplace view is valuable for anthropocentric planning issues.     

三维实体有限元可视化前处理系统开发

可视化前处理系统是有限元软件的重要组成部分。文章介绍了利用Visual C++和OpenGL图形库开发简易实用的三维实体有限元前处理系统的方法,实现了快速建立三维几何模型并划分网格的功能。另外,该系统具备视图操作功能,用户可方便地查看几何模型和有限元模型。     

电子SMT虚拟制造培训系统的研究

本文论述先进SMT虚拟制造技术,研发出先进电子SMT教学培训系统,在电子SMT设计和制造"孤岛"间建立联系,将PCB设计、SMT生产线工艺设计、关健SMT设备编程、加工过程可视化仿真和可制造性评价系统集成,在计算机上以直观、生动、精确的方式模拟出先进电子SMT制造技术。