提高Word文本文档信息隐藏容量的方法研究

介绍文本文件信息隐藏的几种典型编码方法,并比较各种方法的信息隐藏量;分析Word文档的文件结构,提出一种通过字符缩放编码、字体RGB灰度编码、改变Word文本文档中字符下划线RGB灰度值来实现隐藏秘密信息的方法。理论分析和实验结果表明该方法能提高信息隐藏量。     

OpenOffice.org文档结构的研究与分析

阐述OpenOffice.org文档的压缩存储方式以及这种方式和其他的多种存储方式相比的优势;针对OpenOffice.org的各种文档描述了它们的结构,并且讨论了从OpenOffice.org的XML文档中读取元数据方法;最后进一步讨论了OpenOf-fice.org的XML元数据读取的意义以及它和文档结构化其他研究的关系。     

藏文支持在OpenOffice.org办公套件中的实现

办公套件是人们日常应用最为广泛的信息处理软件之一,但真正意义的藏文办公套件至今都尚未问世,成为藏文信息技术发展的“瓶颈”。开源项目OpenOffice.org的不断发展和日益成熟,为藏文办公套件的研制开发提供了有利的契机。以OpenOffice.org为源代码基础,采用藏文编码字符集(扩充集A)国家标准,研制的藏文办公套件可支持藏文排版习惯和藏文本地环境,着重解决了藏文文本自动断行的问题,能够满足藏语文用户日常办公需要。     

采用VB与MATLAB混合编程的数字滤波器设计

结合VB编程简单、界面友好的特点及MATLAB强大的计算、图形表达功能,采用VB与MATLAB的混合编程,可以开发出效率高、使用方便的应用程序.利用ActiveX技术和文件传递参数,解决了VB与MATLAB的混合编程并应用于数字滤波器的设计上,利用该方法设计了FIR数字滤波器.     

Text binarization in color documents

This article presents a new method for the binarization of color document images. Initially, the colors of the document image are reduced to a small number using a new color reduction technique. Specifically, this technique estimates the dominant colors and then assigns the original image colors to them in order that the background and text components to become uniform. Each dominant color defines a color plane in which the connected components (CCs) are extracted. Next, in each color plane a CC filtering procedure is applied which is followed by a grouping procedure. At the end of this stage, blocks of CCs are constructed which are next redefined by obtaining the direction of connection (DOC) property for each CC. Using the DOC property, the blocks of CCs are classified as text or nontext. The identified text blocks are binarized properly using suitable binarization techniques, considering the rest of the pixels as background. The final result is a binary image which contains always black characters in white background independently of the original colors of each text block. The proposed document binarization approach can also be used for binarization of noisy color (or gray‐scale) document images. Several experiments that confirm the effectiveness of the proposed technique are presented. © 2007 Wiley Periodicals, Inc. Int J Imaging Syst Technol, 16, 262–274, 2006     

Pilot Study for the Performance of a New Demand Control Ventilation System in Hong Kong

There are different ventilation control methods for outdoor air quantity in air-conditioned spaces to reduce the energy consumed in cooling the outdoor air. Demand controlled ventilation (DCV) is an important strategy to control the outdoor air quantity. However, the current practice in DCV systems creates several problems for air-conditioned office buildings. Although metabolic carbon dioxide (CO2) concentration is mainly used as a surrogate indicator for ventilation adequacy, the conventional DCV system does not seriously consider the placement location of the CO2 sensor, and it does not take into account the adverse effects of the consequential increase in pollutant concentrations in the indoor space when the fresh airflow rate is reduced. In this study, a long period of subjective and objective measurements were conducted in an occupied office to examine its suitability for conversion to a new demand controlled ventilation system (nDCV). After the feasibility investigation, an nDCV system was developed to optimize the energy consumed for outdoor air ventilation while providing the desirable thermal comfort and indoor air quality. The true optimization of this nDCV is achieved by a new concept of the optimized indoor air quality window which determines the most representative locations for the indicator sensors. A minimum ventilation rate is determined by a calibration procedure for the pollutant inventory of a building, taking into account the infiltration characteristics. Radon gas, which is a notorious carcinogenic indoor pollutant, is used as a reference to determine the minimum fresh airflow rate. The findings show that this nDCV system reduced 16% of fresh air cooling energy consumption without jeopardizing the thermal comfort and indoor air quality.     

对新形势下做好企业办公室工作的思考

国企改制是一次根本性的变革，它必将对企业制度、企业管理及企业员工等方方面面产生深远的影响。国有企业实行股份制改造的进程中，企业办公室也应该跟上时代发展的步伐。要不断创新工作方法，充分发挥主观能动性，增强工作的主动性和预见性。     

文检课个性化教学设计

提出了文检课个性化教学的观点，讨论了实施个性化教学的必要性，指出在网络环境下，如何构建多维的个性化智能教学系统，探讨了个性化的教学方案及基于此的教学内容及考试制度。     

Description of Structural Damage Caused by the Terrorist Attack on the Pentagon

On September 11, 2001, an airliner was intentionally crashed into the Pentagon. It struck at the first elevated slab on the west wall, and slid approximately 310?ft (94.5?m) diagonally into the building. The force of the collision demolished numerous columns and the fa?ade of the exterior wall, and induced damage to first-floor columns and the first elevated slab over an area approximately 90?ft (27.4?m) wide and 310?ft (94.5?m) long. None of the building collapsed immediately. The portion that remained standing, even after an intense fire, sustained substantial damage at the first-floor level.     

Toughness of the Pentagon Structure

On September 11, 2001, the reinforced concrete structure of the Pentagon Building was able to resist, without collapse, the impact of a large commercial airliner despite the total loss of 26 columns and severe damage to 15 columns at the ground level. The ensuing fire and related fire-fighting activities led to the collapse of a portion of the building approximately one-half hour after the impact. In this paper, the reasons for the demonstrated toughness of the reinforced concrete structure are examined and attributed to use of spiral columns, effective splicing of reinforcing bars, strong girders, and short span lengths.