Pachyderm Acoustical Simulation: Towards Open-Source Sound Analysis

The creator of the Pachyderm Acoustical Simulation plug-in, Arthur van der Harten is an acoustician working in the Specialist Modelling Group (SMG) at Foster + Partners. Here he describes the flexible format of this plug-in and how open-source software aided the analysis of a negative distortion in the acoustics of Hamer Hall Arts Centre in Melbourne.     

G‐BLAST: a Grid‐based solution for mpiBLAST on computational Grids

Over the past few years, research and development in bioinformatics (e.g. genomic sequence alignment) has grown with each passing day fueling continuing demands for vast computing power to support better performance. This trend usually requires solutions involving parallel computing techniques because cluster computing technology reduces execution times and increases genomic sequence alignment efficiency. One example, mpiBLAST is a parallel version of NCBI BLAST that combines NCBI BLAST with message passing interface (MPI) standards. However, as most laboratories cannot build up powerful cluster computing environments, Grid computing framework concepts have been designed to meet the need. Grid computing environments coordinate the resources of distributed virtual organizations and satisfy the various computational demands of bioinformatics applications. In this paper, we report on designing and implementing a BioGrid framework, called G‐BLAST, that performs genomic sequence alignments using Grid computing environments and accessible mpiBLAST applications. G‐BLAST is also suitable for cluster computing environments with a server node and several client nodes. G‐BLAST is able to select the most appropriate work nodes, dynamically fragment genomic databases, and self‐adjust according to performance data. To enhance G‐BLAST capability and usability, we also employ a WSRF Grid Service Portal and a Grid Service GUI desk application for general users to submit jobs and host administrators to maintain work nodes. Copyright © 2008 John Wiley & Sons, Ltd.     

基于OpenGL的虚拟车床几何建模

三维几何建模是构建数控加工虚拟仿真环境的基本任务之一。研究直接基于OpenGL实用工具包(OpenGLUtility Toolkit)进行数控加工虚拟仿真几何建模问题。在分析常用几何建模方法不足的基础上,指出直接利用OpenGL及其实用工具包GLUT建立三维模型的优点。简要介绍GLUT的功能,分析基于OpenGL的几何建模方法中的坐标系、矩阵变换顺序、装配层次、以及缩放比例等重要问题。在此基础上构建了虚拟车床的三维几何模型。这有助于提高数控加工虚拟仿真环境的真实感,为虚拟机床运动仿真提供了坚实基础。     

蛋白质关系网络可视化系统的研究与实现

蛋白质关系网络的研究在生物医学领域中已成为一个热点。研究者通过对蛋白质关系网络进行分析和聚类,能够发现其中的复合体,进一步理解细胞组织原理。在对关系网络进行分析的过程中,将网络拓扑显示为图形,以直观地表示出关系网络的结构,便于对比聚类方法,辅助关系网络的研究。利用网络建模与可视化工具包JUNG设计并实现了一个蛋白质关系网络可视化系统,它能够解析多种格式的蛋白质关系网络数据,集成了几种有效的图聚类算法,并实现了一种基于蛋白质功能标注的发现复合体的聚类算法。用户能够通过二维网络视图方便地观察原始网络和聚类后的结果。     

OPC服务器开发工具包软件的设计与实现

针对源码级的用于过程控制的对象链接和嵌入（OPC）服务器开发过于复杂问题,提出OPC服务器开发工具包软件。该软件以Visual C＋＋6.0为开发平台,通过将OPC数据存取规范和COM知识封装成DLL的方式实现。介绍该软件的结构和主要模块的功能,设计OPC服务器。测试结果证明,该软件设计提高程序代码的重用性,缩短软件开发周期,该服务器能实现基本的数据通信。     

网格计算环境配置及资源创建

网格技术近年来发展迅猛,已被人们视为继Internet、Web之后的第三大技术浪潮。而Globus Toolkit4．0（GT4）现已成为构建网格环境和开发网格服务的首选平台。该论文讨论了网格服务的基本思想,分析了GT4的新特性及其在产业界的应用,探讨了在Windowsxp上安装和配置GT4的方法和过程,并且介绍了使用网格模拟器GridSim创建一个网格资源的过程。     

实时控制系统软件的可靠性

为了保证实时控制系统的有效运行，除了满足其实时性要求外，可靠性也很重要。该文讨论了实时控制系统的软件可靠性问题，介绍了QNX的高可用性工具，并根据低杂波系统的分布式实时控制需求提出了通用可靠性模型。该模型为低杂波各子系统的开发提供了统一规范，有效保证了系统的可靠性。     

空间相关MC算法的VTK实现

移动立方体是面绘制的经典算法,但要求对所有空间所有体素进行处理,执行效率不高.通过对空间相关性进行研究,即六面体体素如果与等值面相交,则等值面一定会在该六面体的6个面的方面延续,对标准的MC算法进行改进,只处理那些与等值面相交的六面体体素.可视化工具包封装了许多常用的可视化算法,为研究人员提供了极大的便利.通过空间相关性,对VTK中已有库函数vtkMarchingCubes进行改进,提高了原有算法的执行速度,同时又扩充了VTK已有的类.     

三维可视化技术在现代医学中的应用

随着医学成像和计算机辅助技术的发展,医学图像的三维可视化技术成为研究的热点.本文阐述了实现三维可视化的基本方法、关键技术以及相关的软件开发包,并举例介绍了三维可视化技术在医学诊断和临床治疗中的典型应用.     

A Scalable Toolkit for Designing Multimedia Authoring Environments

This paper introduces Kaomi, a scalable toolkit for designing authoring environments of multimedia documents. The underlying concept is to provide the designer of multimedia applications with a fast method to get an authoring system based on a set of synchronized views (the presentation view for displaying the document, the scenario view for showing the temporal organization of the document, ...) so that each view is the support of editing actions. Kaomi is flexible enough to support a variety of multimedia documents declarative formats. It is indeed a scalable toolkit since it provides facilities for extending and/or for modifying the resulting authoring environment. In addition, cross-platform portability is provided which allows operation in the heterogenous Internet environment. The use of Kaomi is mainly described through the design of two authoring environments: one for authoring a sub-set of the Smil standard of the W3C and the other one for Madeus, a constraint based multimedia language.