在Delphi编程中如何使用数据压缩和解压缩

数据压缩和解压缩,一直是软件技术领域的热门技术,一些程序员曾为数据的压缩和解压缩而费尽心血,在编程时自己按照相应的算法来实现,这样做既费时又费力,在Delphi环境下,数据压缩和解压缩变得非常的容易,本文详细介绍了在Delphi编程环境下,进行应用开发时,使用数据压缩和解压缩的技术和方法.     

VAX/VMS下文件压缩的一种方法

作者介绍了VAX/VMS操作系统下的一种文件压缩方法。作者首先叙述了该方法的基本原理及其实现算法,然后介绍如何在VAX/VMS操作系统下实现各类文件的压缩和还原。     

Delphi实现考试系统数据库题目信息的压缩与解压缩

通过对Delphi压缩和解压缩流类的研究,结合第三方控件TRxRichEdit实现了压缩RTF格式数据的显示和编辑的方法,丰富了考试系统题目信息的存储和显示方式,解决了考试系统数据库题目信息量与存储容量和网络传输的矛盾问题。     

CAI制作辅助软件简介

JPEG Optimizer——图片压缩优化好帮手要使课件中的图片清晰、漂亮,就需要对图片进行压缩。具有压缩功能的软件很多,但有些压缩软件把握不好图片大小与图片品质之间的关系,不是图片所占空间过大,就是画质失真。JPEG Optimizer是一个可以按照指定的压缩比压缩JPEG格式图片的工具软件,它使用MagicCompress技术,能对JPGE图形文件压缩50%而不损失画质,能即时显现压缩后的图片,效果相当不错。除了★.JPG的文件,JPEG Optimizer还可以压缩BMP文件(*.BMP),未压缩的TIFF文件(*.TIF)和TAGAR文件(*.TGA)。它生成的文件是JPEG格式的。从某种意义上讲,JPEG Optimizer是一个简易的图片格式转换工具。下载后的JPEG Optimizer只有一个安装文件,双击此文件就可以运行,安装过程非常简单,全部选择默认的选项即可,三四秒钟就完成安装了。JPEG Optimizer还提供一些个性化的功能。如选中工具栏中的“Grayscale”则图像呈黑白,取消该选项则成彩色;选中工具栏中的“Extra Color”还可以给图像增加色度等。下载站点:http://www.xat.com     

级配对砂泥岩混合料压缩特性的影响

为了研究颗粒粒径对砂泥岩混合料压缩特性的影响,在一定的砂泥岩比例、干密度以及含水率的条件下,采用杠杆式压缩固结仪对5种不同试验级配下的砂泥岩混合料土样进行快速室内侧限压缩实验,得出5种级配下土样的e-p曲线和e-lgp曲线,并计算出土样的孔隙比、压缩系数、压缩指数等压缩指标.探讨了砂泥岩混合料压缩特性与颗粒粒径的关系,分析了试验土体颗粒级配特征值对砂泥岩混合料压缩特性的影响,为实际工程应用提供了参考依据.     

图像压缩编码的综合分析

介绍了预测编码、变换编码、分形图像编码等几种常用的图像压缩编码方法,在进行系统分析和比较的基础上,指出了各种压缩编码方法的优缺点,阐明了压缩技术未来的技术发展方向和应用发展方向.     

浅谈多媒体技术在教学使用过程中的误区

21世纪,人类正在从工业时代向信息时代快速转变,知识也在飞速地增长。以多媒体和网络为主的现代信息技术使知识不再单一,而是融入了音频、视频、图像等多种媒体。“多媒体技术是指把音频、视频、文字、图像、动画等多种信息通过电子计算机进行数字化采集、获取、压缩／解压缩、编辑、存储等加工处理,再以单独或合成形式表现出来的一种技术。”     

合金化对泡沫铝压缩力学性能的影响

采用Si、Mg及Cu元素进行合金化处理，制备了几种不同力学性能的开孔泡沫铝，通过准静态压缩实验研究了合金化对泡沫铝压缩力学行为的影响。实验结果表明，采用Si、Mg及Cu元素合金化处理显著改变了泡沫铝的应力-应变行为。     

综述电视信号的数字化与码率压缩

由于电视图像包含的信息十分巨大，因此为了便于电视信号的存储和传输，需要对图像信息进行数字化和码率压缩。介绍了电视图像信号压缩编码的几种方法：降低抽样频率、差值脉冲编码、线性变换编码、离散余弦变换。     

一种无损快速压缩方法——Ghost的特殊应用

对数据文件进行压缩打包处理,是我们保存和交流文件的一种手段。如何才能高效、快速地进行这项工作,本文结合Ghost软件的特殊用法,说明了如何使用Ghost软件实行无损快速压缩的方法。     

Tumor-associated macrophages in osteosarcoma

Osteosarcoma (OS) is the most common primary bone tumor in children and adolescents. It is an aggressive tumor with a tendency to spread to the lung, which is the most common site of metastasis. Patients with advanced OS with metastases have poor prognoses despite the application of chemotherapy, thus highlighting the need for novel therapeutic targets. The tumor microenvironment (TME) of OS is confirmed to be essential for and supportive of tumor growth and dissemination. The immune component of the OS microenvironment is mainly composed of tumor-associated macrophages (TAMs). In OS, TAMs promote tumor growth and angiogenesis and upregulate the cancer stem cell-like phenotype. However, TAMs inhibit the metastasis of OS. Therefore, much attention has been paid to investigating the mechanism of TAMs in OS development and the progression of immunotherapy for OS. In this article, we aim to summarize the roles of TAMs in OS and the major findings on the application of TAMs in OS treatment.

     

网络监控系统的设计与实现

讨论了计算机网络和网络通信的原理,介绍了Winsocket及使用其编程进入网络通信的方法,提出了利用TCP/IP协议,基于Windows OS机房监控系统的设计和实现方法.     

双操作系统任务调度策略及其改进简

双操作系统是虚拟机运行在主操作系统,然后通过虚拟机来运行从操作系统.从操作系统的任务调度只能等到主操作系统任务调度空闲才能调度.导致不能及时响应高优先级别的任务,系统容易崩溃.因此如果先运行虚拟机,再运行主从操作系统,最后通过虚拟机来调度主从操作系统任务,同时改进双操作系统间的任务调度策略.那么就能保证整个双操作系统任务之间的平滑调度,从而使整个系统稳健可靠运行.     

Reduction of mental distress in the dissection course by introducing the body donor experience through anatomical demonstrations of organ systems

The practice of dissection teaches students not only the foundations of anatomical knowledge but also encourages the development of professional competencies. Yet, the dissection of cadavers in the gross anatomy course can be a stress factor for medical students. There are a minor proportion of students who demonstrate strong emotional reactions in anticipation of being confronted with a cadaver. Therefore, in 2008, the authors implemented a voluntary course entitled, “Anatomical demonstrations of organ systems” (AD‐OS) in advance of the dissection course to ease this psychological burden. The question of whether attendees of AD‐OS showed less mental distress at the start of the dissection course compared with those that had not or only infrequently visited AD‐OS was addressed. AD‐OS attendees assessed their expected mental distress using a five‐point Likert scale before starting the dissection course and a second time at the end of their first day, after they had been confronted with a cadaver. AD‐OS was evaluated as excellent and the majority of students participated actively during teaching sessions. Overall, female students showed higher levels of mental distress. AD‐OS attendees assessed themselves as being less burdened by mental distress than members of the control group. Longitudinal analysis revealed that students who visited AD‐OS showed a marked decrease of their mental distress level, comparing prospective and retrospective ratings. This was significantly (P < 0.001; Z = ?6.061) different from nonattendees or those who visited AD‐OS only infrequently. AD‐OS satisfied its intended teaching goals and proved that a step‐by‐step introduction of dissection through anatomical demonstrations helped to reduce the mental distress of students. Future studies are planned to measure mental distress with objective instruments. Anat Sci Educ © 2012 American Association of Anatomists.     

LINUX平台开发的水文检测系统研究

文章给出了Linux平台开发的水文检测系统设计与实现方案,讨论了Linux OS（操作系统）的实时性改进及系统的定制,实现了用Linux下C语言编程对系统的关键部分进行定制。采用SQL Server2000数据库来对数据进行存储,并设计了它与系统的接口。文章还讨论了系统的反馈调节。     

基于PKI加密设备的CSP软件设计与实现

Windows环境下,微软以CSP方式向用户提供了加密应用程序接口,本文在分析了微软操作系统加密体系的基础上,详细说明了基于PKI加密设备的CSP软件的设计方法。     

《庄子》形容词兼语句的句型及结构模式

《庄子》形容词兼语句共有36句,分为五种句型,其最基本的句型结构模式是：S＋PV1＋OS＋PA2。其余的各种句型可以看作是它的变体。此外,兼语句有时还和连谓结构组成多重复杂的谓语句,其结构模式有两种：S＋PV1＋（OS）＋PA1＋“而”＋（Adv＋）PA2／PV2PV（＋O）;S＋PA1＋O＋PV2＋（OS）＋Adv＋PV2＋O。     

Fractionated evaluation of immunohistochemical hormone receptor expression enhances prognostic prediction in breast cancer patients treated with tamoxifen as adjuvant therapy

Objective:To compare the prognostic prediction between dichotomized and fractionated evaluations of hormone receptor expressions. Methods: Patients with stages I-III breast cancers, who received adjuvant tamoxifen, were enrolled. The expression of estrogen receptor (ER) and progesterone receptor (PR) was evaluated by immu-nohistochemistry (IHC). A fractionated score (F score), the percentage of positive-staining nuclei (0=none, 1=1%-10%, 2=11%-30%, 3=31%-50%, 4=51%-70%, and 5=71%-100%), was assigned to each...     

Interactive Dynamic-system Simulation in Classroom and Lab: Neural Networks,DOS, OS/2 and UNDC

We discuss teaching applications of new personal computer (PC) and workstation programs for simulating dynamic systems and neural networks. DESIRE software permits truly interactive modeling without the usual annoying time delays imposed by FORTRAN compilation and linking. DESIRE/NEUNET brings similar convenience to the interactive design of systems which include neural networks. Neuron-layer interconnections are described in a readable matrix language. We introduce PC simulation under OS/2 and workstation programs for UNIX/OPEN WINDOWS, and dwell briefly on the impact of these new operating systems on educational simulation laboratories     

USB接口数据安全控制在Linux内核中的实现

现有的USB技术能够提供极快的数据传输速度，通过USB接口进行数据转存非常方便，但同时也带来一些安全隐患.本文主要以Linux操作系统作为实验对象，在操作系统的内核中嵌入对USB接口数据的加密处理过程，从而实现了数据的安全传递.