基于IRIG106第十章标准的1553B数据处理技术研究

IRIG 106第十章标准是当前飞行试验机载数据主要记录格式.提出1553B数据处理新模型,将数据处理任务分解成排故和特定科目试飞鉴定两种需求,采用不同的数据处理策略;摒弃复杂的专业数据库,使用两种简单的数据结构创建1553B ICD信息文件;研究1553B协议分析算法,从原始数据文件中将二进制1553B消息100％转换为排故用的文本格式,并直接计算1553B消息物理量.数据处理结果表明,1553B数据处理新方法可行,降低了1553B数据处理难度,数据处理效率高,已在型号试飞中取得良好效果.     

Methods and software tools to support combined binary code analysis

Methods and tools for binary code analysis developed in the Institute of System Programming, Russian Academy of Sciences, and their applications in algorithm and data format recovery are considered. The executable code of various general-purpose CPU architectures is analyzed. The analysis is performed given no source codes, debugging information, and specific OS version requirements. The approach implies collecting a detailed machine instruction level execution trace; a method for successively increasing presentation level; extraction of algorithm’s code followed by structuring of both code and data formats it processes. Important results are obtained, viz. an intermediate representation is developed that allows carrying out most preliminary processing tasks and algorithm code extraction without having to focus on specifics of a given machine; and a method and software tool are developed for automated recovery of network message and file formats. The tools are integrated into the unified analysis platform that supports their combined use. The architecture behind the platform is also described. Examples of its application to real programs are given.     

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.     

Raw data extraction from electrocardiograms with Portable Document Format

During the last two decades there has been a thorough research and development of standards and protocols in order to cope with different electrocardiogram formats from heterogeneous acquisition systems. Despite the efforts of public and private consortiums on creating a standardized electrocardiogram (ECG) storage format, there is still not a single one. Indeed, there is also the necessity of access to raw data of the ECGs previously acquired. Most of these documents have been saved as Adobe PDF files, since for medical staff it is an easy format for later visualization. However, this format presents difficulties when trying to access original raw data for subsequent studies and signal analysis. In this manner, this paper presents an application that obtains plain numerical data from ECG files stored with PDF format. Data can also be exported to one of the most common file formats in existence, to be easily accessed thereafter.     

基于VRML文件的二进制压缩编码技术研究

VRML已经成为互联网上传输三维模型的主要文件格式。对于复杂场景模型具有数据信息量大的特点,尽管传统的VRML文件已采用了某种形式的压缩处理,但其文件仍旧相对庞大。因此,文章提出针对VRML文件的二进制压缩编码技术,对这些数据进行压缩处理,使之大小适合在网络中传输,同时压缩后的数据信息不影响虚拟可视化的显示质量。     

空间信息栅格中的不同数据格式转换研究

空间信息存在数据量大、处理复杂、难以共享等问题。空间信息栅格（SIG）的一个主要任务就是实现一体化、智能化的空间信息获取、存储、组织、分发、融合及互操作,形成空间信息资源共享与集成。通过比较目前主要的几种空间数据格式,在分析了数据转换的主要方法后,提出以MIF文件格式为中间桥梁的思想,通过两两不同的空间数据的相互转换,实现了多种空间数据之间的转换,有效地解决了不同空间数据的共享问题。     

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。     

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.     

通用型字段中存储文件的导出方法

VFP数据表中的通用型字段中可存储声音、图像、动画等类型的文件,文件添加到通用型字段中VFP提供了相应的命令格式,但将通用型字段中的文件导出恢复到原对应的格式文件却没有提供相应的命令,本文介绍了如何利用文件格式标识确定文件存储位置并导出文件的方法。     

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.     

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。     

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。     

基于VB6．0和OpenGL的DXF文件读取与交互控制

DXF文件格式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。为开发一套三维可视化仿真数据分析软件,首先就必须解决对DXF文件的读取及显示问题。文章详细分析了ASCII码格式DXF文件的数据结构特点,然后,使用VB6．0从中读取数据,并利用OpenGL的模型绘制和渲染功能,实现了三维模型的重构以及交互控制。这种处理方法既能满足快速建模的需要,又能高效地实现友好的交互功能。     

基于BMP位图的LSB信息隐藏算法的实现

在介绍BMP（Bitmap）图像文件格式的基础上,以24位BMP位图作为信息的载体,基于VC＋＋6．0开发平台,利用位运算和二进制文件操作功能,实现了在空域的LSB（Least Significant Bits,最低有效位）上对数据信息的隐藏和提取。     

一种基于分布式平台Hadoop的矩阵相乘算法

为了解决单节点上大矩阵相乘运算量过大的问题,提出了一种基于分布式平台Hadoop的矩阵相乘算法．算法采用了字节文件作为输入以及最优化的分片方式,去掉了不必要的Reduce过程,极大地减少了输入数据量,拥有简洁的算法流程和可拓展性．实验结果表明该算法很好地解决了矩阵相乘运算量过大的问题,当输入数据量接近集群最佳负载量的情况下取得了很好的加速比．     

An object oriented fully 3D tomography visual toolkit

In this paper we present a modern object oriented component object model (COMM) C + + toolkit dedicated to fully 3D cone-beam tomography. The toolkit allows the display and visual manipulation of analytical phantoms, projection sets and volumetric data through a standard Windows graphical user interface. Data input/output is performed using proprietary file formats but import/export of industry standard file formats, including raw binary, Windows bitmap and AVI, ACR/NEMA DICOMM 3 and NCSA HDF is available. At the time of writing built-in implemented data manipulators include a basic phantom ray-tracer and a Matrox Genesis frame grabbing facility. A COMM plug-in interface is provided for user-defined custom backprojector algorithms: a simple Feldkamp ActiveX control, including source code, is provided as an example; our fast Feldkamp plug-in is also available.     

SVG技术在实时信息发布系统中的应用

随着Internet技术的普及和发展,基于B／S结构的实时数据发布已成为信息系统中一项重要的功能。SVG作为基于XML的网络矢量图像格式,具有其他图像格式所不可比拟的优势。根据SVG的技术特点,将SVG和实时数据库相结合,在实时信息系统中利用SVG技术发布实时数据是适用于B／S结构、具有应用前景的一种解决方案。该方案的关键技术是定时刷新基于XML的SVG文本文件。实践表明该方案具有良好的实际应用表现,能够有效地减轻网络传输的负担、缩短用户界面的响应时间。     

ML3200软磁盘质量鉴定仪软件包的二次开发

根据ＭＬ３２００软磁盘质量鉴定仪软件包生成的文件的数据结构，给出了用Ｃ语言编写的转换程序，实现了原软件包没有提供的将ＹＬＤ、ＦＤＴ格式的二进制文件转化为可阅读的文本文件；利用包含出错信息的ＢＩＮ３．ＬＯＧ文件，进行磁道出错分布的统计等两个功能。     

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.     

MIME文档和集合文档的解码算法

MIME（Multipurpose Internet Mail Extensions）主要用于电子邮件传输非文本数据。它兼容旧版本的信息格式,使得那些旧的应用网关也可以处理MIME格式的信息,并增加了许多功能,可以用邮件传输二进制数据。集合文档是MIME格式的一种应用,用于将根资源和附属资源集合进同一个信息里。文章首先介绍了MIME格式和集合文档的格式,给出了一个对MIME格式文档的解码算法,然后在这个算法的基础上给出了集合文档的解码算法。