Software for advanced HRV analysis

A computer program for advanced heart rate variability (HRV) analysis is presented. The program calculates all the commonly used time- and frequency-domain measures of HRV as well as the nonlinear Poincaré plot. In frequency-domain analysis parametric and nonparametric spectrum estimates are calculated. The program generates an informative printable report sheet which can be exported to various file formats including the portable document format (PDF). Results can also be saved as an ASCII file from which they can be imported to a spreadsheet program such as the Microsoft Excel. Together with a modern heart rate monitor capable of recording RR intervals this freely distributed program forms a complete low-cost HRV measuring and analysis system.     

三维模型文件中的OBJ格式在OpenGL中的输入与处理

介绍了当今流行的三维作图工具Maya,阐述了Maya生成的.OBJ三维格式,如何将OBJ格式文件在OpenGL(Open Graphic Library)中进行输入和处理.重点介绍了OBJ文件的文件格式及怎样利用程序代码来构建模型数据结构、绘制对象模型,然后运用OpenGL的强大功能实现三维显示和交互操作.     

A new Steiner patch based file format for Additive Manufacturing processes

Additive Manufacturing (AM) processes adopt a layering approach for building parts in continuous slices and use the Standard Tessellation Language (STL) file format as an input to generate the slices during part manufacturing. However, the current STL format uses planar triangular facets to approximate the surfaces of the parts. This approximation introduces errors in the part representation which leads to additional errors downstream in the parts produced by AM processes. Recently, another file format called Additive Manufacturing File (AMF) was introduced by ASTM which seeks to use curved triangles based on second degree Hermite curves. However, while generating the slices for manufacturing the part, the curved triangles are recursively sub-divided back to planar triangles which may lead to the same approximation error present in the STL file. This paper introduces a new file format which uses curved Steiner patches instead of planar triangles for not only approximating the part surfaces but also for generating the slices. Steiner patches are bounded Roman surfaces and can be parametrically represented by rational Bezier equations. Since Steiner surfaces are of higher order, this new Steiner file format will have a better accuracy than the traditional STL and AMF formats and will lead to lower Geometric Dimensioning and Tolerancing (GD&T) errors in parts manufactured by AM processes. Since the intersection of a plane and the Steiner patch is a closed form mathematical solution, the slicing of the Steiner format can be accomplished with very little computational complexity. The Steiner representation has been used to approximate the surfaces of two test parts and the chordal errors in the surfaces are calculated. The chordal errors in the Steiner format are compared with the STL and AMF formats of the test surfaces and the results have been presented. Further, an error based adaptive tessellation algorithm is developed for generating the Steiner representation which reduces the number of curved facets while still improving the accuracy of the Steiner format. The test parts are virtually manufactured using the adaptive Steiner, STL and AMF format representations and the GD&T errors of the manufactured parts are calculated and compared. The results demonstrate that the modified Steiner format is able to significantly reduce the chordal and profile errors as compared to the STL and AMF formats.     

浅谈数字音频文件格式及其转换应用

在广播领域使用的数字音频文件格式有多种,其中包括数字音频工作站的制作音频文件格式(S48),漫录系统音频文件格式(S48)以及Wav文件格式和MPEG-1音频压缩文件格式等等。该文针对广播电台常使用的两种音频文件格式进行介绍,并对这几种音频文件格式之间的转换方法和软件应用进行阐述。     

U3D文件格式及运行机制剖析

通用三维文件格式（U3D）是一种可扩展的三维数据文件格式,其目的是为了使下游的3DCAD数据重用和可视化。它主要嵌入到其它文件格式中来显示三维数据,因此在许多主流的应用程序中极为有用。详细分析了这种文件格式及其运行机制,并通过一个写U3D文件的编程实例来进一步说明文件的构造方式。最后,还探讨了这种文件格式的优点及其应用。     

向PE文件中插入代码技术的研究

PE文件格式是Windows操作系统引入的可执行文件格式。论文介绍windows平台下PE文件的基本结构。重点阐述了在不重编译源码的前提下实现代码插入技术所涉及的基本任务:把代码插入到PE文件中可用的空闲空间或者在文件尾部添加一个新的节来插入代码;如何用一般方法钩住程序的控制和和重定位插入代码;插入代码如何获取对其有用的windowsAPI函数的地址。向PE文件插入外部代码技术的研究是很有价值的,它对反PE型病毒和软件加壳技术的研究都很有用。     

It's all about the format – unleashing the power of RAW aerial photography

Current one-shot, handheld Digital Still Cameras (DSCs) generally offer different file formats to save the captured frames: Joint Photographic Experts Group (JPEG), RAW and/or Tag(ged) Image File Format (TIFF). Although the JPEG file format is the most commonly used file format worldwide, it is incapable of storing all original data, something that also occurs, to a certain extent, for large TIFF files. Therefore, most professional photographers prefer shooting RAW files, often described as the digital photography's equivalent of a film negative. As a RAW file contains the absolute maximum amount of information and original data generated by the sensor, it is the only scientifically justifiable file format. In addition, its tremendous flexibility in both processing and post-processing also makes it beneficial from a workflow and image quality point of view. On the other hand, large file sizes, the required software and proprietary file formats remain hurdles that are often too difficult to overcome for many photographers. Aerial photographers who shoot with handheld DSCs should be familiar with both RAW and other file formats, as their implications cannot be neglected. By outlining the complete process from photon capture to the generation of pixel values, additionally illustrated by real-world examples, the advantages and particularities of RAW aerial photography should become clear.     

计算机存储化学结构的格式及其相互转化

在计算机中存储化学结构是化学信息学首先要解决的问题,由于历史的原因,现在化学结构存储的文件格式多不胜数,给相关研究工作带来了诸多不便。本文首先综述分子结构在计算机中常见的编码方式,介绍化学结构存储的常用文件格式,讨论分子模拟工作中文件格式的选择。然后,总结常用分子模拟软件对这些分子结构文件格式的支持,介绍几种化学结构文件格式转化软件(babel,convert,consystant,vega等),并讨论不同文件类型之间的转换方法。最后,指出应从速制定化学结构文件格式的标准,因为它是化学软件标准的重要内容之一。     

面向Java 3D的CAD模型简化与转换

三维图形仿真的一个重要工作就是建立三维模型,若使用已有的模型可以节省一定的时间.文中主要讨论了如何将复杂的CAD模型应用于Java3D建立的图形仿真系统中.首先,对已有的Pro/E模型进行简化,以VRML格式导出,有两种方式应用于Java3D中.一种是直接编辑Pro/E模型导出的VRML格式文件,组织模型之间的链接关系;另一种是将Pro/E模型导出的VRML格式文件导入到3DMax中组织链接关系,然后导出为单一文件.最后联合使用这两种方式将一个复杂的空间机器人模型导入到Java3D,提高了图形数据的重用性和开发的快速性,经实践验证效果理想.     

32位Windows系统下 PE文件的软件加密解密方法

PE文件格式（Portable Executable File Format）是32位Windows操作系统引入的可执行文件格式．本文介绍了PE文件的格式，对格式中重要的部分及其在Windows操作系统下的装入机制进行了详细的分析。最后提出了用软件对PE可执行文件的加密解密方法。     

Biomechanical ToolKit: Open-source framework to visualize and process biomechanical data

C3D file format is widely used in the biomechanical field by companies and laboratories to store motion capture systems data. However, few software packages can visualize and modify the integrality of the data in the C3D file. Our objective was to develop an open-source and multi-platform framework to read, write, modify and visualize data from any motion analysis systems using standard (C3D) and proprietary file formats (used by many companies producing motion capture systems). The Biomechanical ToolKit (BTK) was developed to provide cost-effective and efficient tools for the biomechanical community to easily deal with motion analysis data. A large panel of operations is available to read, modify and process data through C++ API, bindings for high-level languages (Matlab, Octave, and Python), and standalone application (Mokka). All these tools are open-source and cross-platform and run on all major operating systems (Windows, Linux, MacOS X).     

一种改进的针对复合文档的Fuzz测试技术

Fuzz测试是一种黑盒测试技术,通常用于发现应用程序以及协议的漏洞。利用这种技术对使用简单格式数据的应用程序或者网络协议进行安全性测试时效果比较显著,但是在对大型办公软件的安全性测试中,由于其软件文件格式复杂,暴力Fuzz测试效率低下。为了提高对办公软件安全性测试的效率,针对它所采用的复合文档文件类型,根据其结构化存储的特征,提出了一种有效的Fuzz测试策略。     

U3D文件在PDF中的应用及其C＋＋编程实现

在探讨PDF文件格式的基础上,提出了一种通用三维(简称U3D)文件格式嵌入到PDF文件中的方法。这种方法具有可扩展性,对于如何在其他文件中支持U3D文件格式的应用研究也具有一定的参考价值。最后,还通过C++编程实现了在PDF文件中嵌入3D作品,并允许用户交互地观看显示效果。     

熔丝沉积快速成形的控制及软件系统的研究

基于国内需要开发了熔丝沉积快速成形(FDM)设备,介绍了其工作原理及硬件控制结构设计,并详细描述了控制及软件体系结构。软件体系结构包括处于内核态的驱动程序和处于用户态的数据处理部分软件。数据处理部分包括硬件抽象层、读取接口数据文件、虚拟机及上层GUI应用程序。     

AutoCAD DXF文件格式与二次开发图形软件编程

DXF格式文件是传统图形开发中最常用的图形交换格式之一，众多第三方开发的图形软件均加入了对DXF文件的支持。针对DXF格式文件的二次开发问题，简要介绍了DXF格式交换文件的结构，详细分析了各代码段与组码的含义及其关系。以及在DXF二次开发图形软件中针对DXF文件格式的编程方法。在此基础上对DXF文件格式的版本演进与不同版本问格式进行了细致的分析与比较，通过在一个具体项目中的应用，给出了一个通用的、具有版本兼容性的DXF文件编程方法，为类似图形软件的二次开发提供了一个解决方案。     

VEGA: a versatile program to convert,handle and visualize molecular structure on Windows-based PCs

We here propose the program VEGA, that was developed to create a bridge between the most popular molecular software packages. In this tool some features are implemented some features to analyze, display and manage the three dimensional (3D) structure of the molecules. The most important features are (1) file format conversion (with assignment of the atom types and atomic charges), (2) surface calculation and (3) trajectory analysis. The executable and the source code can be free downloaded from [URL: see text].     

基于C#的图片点阵数据提取和转换软件的开发

针对嵌入式系统的GUI(Graphical User Interface)设计中对彩色图片和图标的点阵数据的需求,设计一种能从多种常见图片文件中提取点阵数据并转换格式的软件.开发过程采用基于.Net Framework 2.0的C#语言,采用完全面向对象的方法,将文件处理、数据提取、格式转换以及输入和输出等功能封装成一个图像处理类.在绣花机控制器的开发使用中表明,该软件使用方便、功能实用、性能良好,完全达到设计目的,满足了GUI设计的需求.     

基于中间件的航电系统接口仿真通用软件设计

提出了一种基于”仿真软件＋中间件”的接15／仿真系统通用软件架构。开发了Interface_RTI中间件,使用XML文件作为系统配置文件,无需重新编译Interface_RTI中间件程序就可以支持在不同系统上的仿真运行,降低了软件维护成本。对仿真软件进行了合理的任务划分和优先级设置,减少了任务调度开销,保证了软件实时性。该软件能满足某型UAV航电系统的接口仿真功能、性能、通用性、可靠性及灵活性要求。     

基于Windows Media Player的MP4视频点播的实现

阐述在Wince系统的移动终端和Windows系统的PC电脑终端上,利用DirectShow实现Windows Media Player播放器对MP4流媒体文件的VOD点播功能。由于音视频文件格式繁多,仅针对MP4的标准格式经行一般性的描述和具体实现,对其他格式媒体文件的WMP点播提供了解决的依据,在加入其他格式的文件解析后将得到新的应用。     

Integration of design and manufacturing for structural shape optimization

This paper presents an integrated design and manufacturing approach that supports shape optimization of structural components. The approach starts from a primitive concept stage, where boundary and loading conditions of the structural component are given to the designer. Topology optimization is conducted for an initial structural layout. The discretized structural layout is smoothed using parametric B-Spline surfaces. The B-Spline surfaces are imported into a CAD system to construct parametric solid models for shape optimization. Virtual manufacturing (VM) techniques are employed to ensure that the optimized shape can be manufactured at a reasonable cost. The solid freeform fabrication (SFF) system fabricates physical prototypes of the structure for design verification. Finally, a computer numerical control (CNC) machine is employed to fabricate functional parts as well as mold or die for mass production of the structural component. The main contribution of the paper is incorporating manufacturing into the design process, where manufacturing cost is considered for design. In addition, the overall design process starts from a primitive stage and ends with functional parts. A 3D tracked vehicle roadarm is employed throughout this paper to illustrate the overall design process and various techniques involved.