SaxsMDView: a three‐dimensional graphics program for displaying force vectors

A new three‐dimensional graphics program, SaxsMDView, is described. The program performs a three‐dimensional graphical representation for protein molecules along with the force vector (or vector potential) applying to each atom. The displayed object can be rotated and translated in arbitrary directions by interactive mouse manipulation. While SaxsMDView was originally intended to visualize the result of SAXS_MD, a previously developed program based on the restrained molecular dynamics with small‐angle X‐ray scattering constraints, it can also be useful for graphical representation of other objects such as coarse‐grained molecular models reconstructed by ab initio modelling or solvent site‐dipole field vectors induced around the protein molecule. Some examples of the application of the program including the graphical analyses of the results with SAXS_MD are also presented.     

矢量图形中基于小波变换的盲水印算法

提出一种用于矢量图形的数字水印方法.该方法将矢量图形中图元的顶点坐标有顺序地排成一维序列,通过离散小波变换将序列分解成不同空间和频率上的复值系数,并根据水印的大小与小波系数之间的关系把水印嵌入到小波系数的幅值中,系数的相位不变.该算法在提取水印时不需要原始矢量图形.实验证明该算法具有良好的不可见性和较强的鲁棒性.     

基于WebGL的舰船模拟训练虚拟三维技术应用

由于目前国内的舰船模拟训练系统大多均为岸基模拟器,和半实物半仿真的应用模式,受制于该传统方式下系统通用性、可扩展性差,成本高等局限性;提出一种基于WebGL的舰船模拟训练虚拟三维环境,采用其应用框架Three.js图形引擎库在网页中绘制3D虚拟交互界面,可直接通过浏览器登录系统,从而给出了可跨平台免插件高效的舰船模拟训练界面;结果表明该方法在人机交互界面的友好性、监控的直观性、训练操作的便捷性、较强的沉浸性等方面具有优势,亦可推广应用于其他模拟训练领域。     

RTG及其在目标跟瞄视景仿真中的应用

 视景仿真为科研人员提供了空间认知事物规律的手段；为考察激光雷达对动态目标的捕获跟踪过程，初步开发了基于局域网的激光雷达分布式交互仿真系统；在该系统的开发过程中，目标跟瞄过程视景仿真系统是关键。介绍了3维图形开发工具包RTG，并与目前流行的视景仿真软件Vega进行了比较，同时对目标跟瞄视景仿真系统开发中重要组成部分的具体实现进行了较详细的阐述。     

交互式网格生成技术研究

探讨了分区网格生成的交互方法,包括交互输入、图形显示、网格质量检查、网格求解过程的随机可视控制等问题。在此基础上研制了一种具有交互性能的网格生成系统——BIGG。应用该系统生成的网格实例及流场解表明该交互技术是有效可行的,研制的软件系统提高了生成效率和网格质量。     

同步卫星扫描视锥与轨道的绘制算法

为了模拟同步卫星在外太空的飞行状态,建设先进的同步卫星模拟仿真系统对于卫星的研制与性能分析有着重要的意义;由于卫星是在特定的轨道上飞行,所以对卫星轨道的绘制建模是卫星模拟仿真系统开发中关键的一环;在这篇文章中介绍了同步卫星与地面观察站通信过程中的扫描视锥与同步卫星运行轨道的绘制算法,重点探讨了基于OpenGL基本矢量图元的绘制以及利用世界坐标系和向量的方法对在绘制过程中所需数据的求解过程;分析了根据同步卫星的运行姿态与其所在轨道的位置来确定同步卫星扫描视锥的角度;最后通过一个虚拟世界的3D引擎验证算法的可行性与绘制效果。     

基于Open VG云电子书系统的多级优化框架设计

针对电子书应用存在的文件格式、性能效率低下和图像失真等问题,设计了一种应用于云电子书系统的多级优化框架,优化框架主要体现在如下三个方面。第一,对向量图形类库的性能进行描述,并提出了一种优化算法,减少了类库的时间复杂度。第二,在嵌入式GPU上并行进行坐标系统的计算。利用GPU在并行计算方面的优势,云电子书在向量图形类库方面获取了显著的性能提升。第三,云电子书将文件转化功能转嫁给Hadoop云平台,节省了移动设备的能量消耗和计算时间。同时为了对Hadoop调度过程中的数据位置问题进行优化,将位置感知调度器运用到提出的系统。实验结果表明：云电子书系统与最初的Open VG类库相比,性能提升了约70%,而且云电子书系统与连续服务器平台相比,计算时间减小了约60%。     

一种可交互的体绘制光学传递函数模型

针对三维数据场可视化过程中兴趣区的交瓦分离问题.给出了基于体绘制光学传递函数的半自动调节方法.该方法从传递函数的光学模型出发,根据三维数据的光强分布,结合体数据的三维梯度场.给出了体数据的颜色及透明度值分离交互凋常的模犁.为了提高本方法的实用性,本文采用了交互模型与现代显卡纹理特性相结合的方法来提高交互速度.实验证明,通过实时调节改进传递函数的相关参量.该模型能以大于每秒30帧的交互速度获得必趣区的最佳视觉分离效果.本方法能在交互体视化的同时实现最佳参量的获取.     

Correction of Relativistic Center-of-Mass Vector on Electric Polarizability of Pion Meson

We estimate the correction of relativistic center-of-mass vector on electric polarizability of an equal-mass quark-antiquark system numerically. Effect on the system confined by different interactive potentials is analysed. A great improvement for the electric polarizability of pion meson is obtained.     

A short recollection on the paper entitled "A common sense approach to peak picking in two-, three-, and four-dimensional spectra using automatic computer analysis of contour diagrams" by D.S. Garrett, R. Powers, A.M. Gronenborn, and G.M. Clore [J. Magn. Reson. 95 (1991) 214-220

The Contour Approach to Peak Picking was developed to aid in the analysis and interpretation and of multidimensional NMR spectra of large biomolecules. In essence, it comprises an interactive graphics software tool to computationally select resonance positions in heteronuclear, 3- and 4D spectra.     

Four-dimensional geometric element definitions and interferences via five-dimensional homogeneous processing

Abstract  

We have systematized various studies on 4-D visualization and interaction thus far, and we proposed 4-D geometric algorithms via 5-D homogeneous processing. Our framework uses 5 × 5 matrices and 5 × 5 determinants to express various types of transformations, and it simplifies geometric operations without the use of division operations. Using the proposed scheme, we developed an interactive 4-D space display system. The simplicity, generality, and duality of 5-D homogeneous processing are effective not only for 4-D geometric operations but also for interference problems among various 4-D objects. However, the processing regarding geometric characteristics of 4-D objects was not considered in our previous works. In this paper, we describe 4-D geometric elements, in general, and we discuss 4-D computational geometry via 5-D homogeneous processing. Unified geometric operations without the use of division operations constitute the most important part of 5-D homogeneous processing. We systematize the methods for 4-D geometric element definitions and interferences via 5-D homogeneous processing. In the field of 4-D visualization, the proposed algorithms can be potentially used in a user interface for feature detection of a 4-D object and collision detection of several 4-D objects. We comprehensively develop and advance the theoretical framework in the field of 4-D graphics. It is expected that this method of processing will be useful for the performance improvement of 4-D graphics systems.     

高准确度多功能激光直写装置

采用高数值孔径物镜和高准确度纳米平台搭建了一台激光直写装置,可以在光敏感薄膜材料上进行打点、刻画矢量和标量图形等多种操作,其最小特征尺寸小于300 nm,重复性5 nm.在刻写前准确标定刻写激光功率,刻写过程中采用象散法精确自动聚焦,刻写完成后采用两种不同波长的激光束探测样品的透过率和反射率的细微变化,最终实现了高准确度亚微米图形的刻写和检测.     

高准确度多功能激光直写装置

采用高数值孔径物镜和高准确度纳米平台搭建了一台激光直写装置,可以在光敏感薄膜材料上进行打点、刻画矢量和标量图形等多种操作,其最小特征尺寸小于300 nm,重复性5 nm.在刻写前准确标定刻写激光功率,刻写过程中采用象散法精确自动聚焦,刻写完成后采用两种不同波长的激光束探测样品的透过率和反射率的细微变化,最终实现了高准确度亚微米图形的刻写和检测.     

Two modes of laser lithography fabrication of three-dimensional submicrometer structures

The modes of laser lithography fabrication of three-dimensional submicrometer structures have been studied. The method is based on the effect of threshold two-photon polymerization of a photosensitive material at the laser beam focus. To determine the lithograph workspace in the coordinates “laser power-speed of the sample displacement with respect to the laser focus,” a series of photonic crystals with the woodpile structure is prepared. Two methods for fabricating three-dimensional structures, i.e., raster scanning and vector graphics (or the vector method) are analyzed in detail. The advantages of the vector method for fabricating periodic structures are demonstrated using crystals of inverted yablonovite as an example. The prepared samples are studied by scanning electron microscopy.     

Cost-effective double-layer antireflection coatings in mid-wavelength infrared band

In this letter, design and preparation of cost-effective double-layer antireflection (AR) coatings in mid-wavelength infrared band is investigated. The method of vector graphics which is simple and visualized for coatings designs with only a few layers is applied to design narrow-band double-layer AR coatings with high performance and low cost for laser applications. The experiment result verifies the design very well with peak transmittance very close to the theoretical limit.     

基于OSG的空间机械臂三维仿真平台的设计与实现

为了实现空间机械臂路径规划算法的可视化仿真,采用OSG(OpenSceneGraph)技术,开发了一个实用方便的空间机械臂三维仿真平台。该仿真平台在VS2005开发平台上,基于QT框架类和OSG的图形库进行开发,将仿真平台系统框架分为了OSG仿真界面,任务管理,数据管理和路径规划四个模块并设计了人机交互界面。最后,通过典型的仿真实验对仿真平台进行了测试,有效的验证了空间机械臂单臂路径规划算法和双臂协调路径规划算法的正确性以及空间机械臂三维仿真平台的可行性。     

Matrix order andW*-algebras in the operational approach to statistical physical systems

An important problem in the axiomatic approach to statistical physical systems is to characterize ordered vector spaces that are isomorphic to the predual of aW*-algebra. Recent work of Werner has shown that the set of interactive neutral hereditary projection on a matrix ordered complete base norm spaceV is order isomorphic to the lattice of projections of aW*-algebra, called the matrix multiplier algebra. If there are sufficiently many of these projections, thenV is the predual of its matrix multiplier algebra. This mathematical conception is motivated by physics. The result shows that matrix order instead of merely partially order provides a setting in which an axiomatic approach to statistical physical systems may be studied. In this paper the discussion on the physical relevance of the conception of matrix order and interactive neutral hereditary projections is started.     

分析各向异性光波导的一种新系统

报道一种灵活，交互和自动化的系统，它以矢量有限无法为基础，并在ＩＭＳＬ的ＰＤＥ／ｐｒｏｔｒａｎ题解环境中实现，用它分析各向异性光波异，得到了各向异性介矩形导中所用传播模式的数值结果，以及采用传播常数和模场分布二种形式评价这个方法的精度，并与早期的研究结果加以比较。     

Automatic fringe analysis for moiré topography

Two digital systems are developed for the automatic measurement of 3-D shapes using moiré techniques—an automatic 3-D shape measuring system using the scanning moiré method and an interactive fringe analysing system for moiré fringe photographs. In the automatic 3-D shape measuring system, a deformed grating is scanned and sampled with an electronic image scanning device so that moiré fringes are generated in a computer. This technique of electronic fringe generation eliminates ambiguity with regard to the sign of the moiré fringes. The interactive fringe analyser provides a flexible and versatile tool for moiré fringe analysis. Medical applications of these analysing systems are discussed.     

支持向量学习并行区域增长结合活动轮廓模型的图像分割算法

为克服经典区域增长算法门限设置困难和图像分割精度不高的问题,提出了基于支持向量机学习的区域增长与活动轮廓模型结合的高精度图像分割算法。首先交互式选择属于目标区域的子块和背景区域的子块形成支持向量机的训练样本;并利用这些已知的训练样本训练支持向量分类器。在目标与背景的并行竞争增长过程中,利用训练好的支持向量分类器(SVC)进行分类判决,得到目标对象的初始轮廓。为提高分割对象的精度,采用活动轮廓模型获得准确的边缘。仿真实验获得了较好的分割效果,表明该提出的算法是合理可行的。