基于过滤驱动的文件防护系统的实现

为了提高Web服务器的安全性,结合当前主流的防篡改技术,设计并实现了基于文件过滤驱动的文件保护程序.根据文件保护程度不同,将被保护文件分为两个不同保护等级,低级保护等级包括禁止写操作、删除操作、重命名操作,其中禁止写操作是通过禁止修改文件只读属性来控制.高级保护等级是通过Hook技术禁止对文件进行访问操作,实验表明通过这两种方法实现的文件驱动程序可以进一步加强服务器文件的安全性.     

电子文件的分类与管理对策探析

随着信息技术的快速发展,电子文件的数量越来越多.因此分析、研究电子文件的分类问题,对改变当前档案工作者传统的管理理念和方法、提高电子文件的管理能力与水平具有重要意义.通过对电子文件的分类和特征分析,提出了电子文件在档案管理过程中的管理模式、检索原则和归档方法,并结合信息安全技术,论述了电子文件在档案管理过程中的真伪甄别、安全性保护等技术难题.     

铁路车站计算机联锁软件的安全性评估策略

安全控制系统的行为直接关系人身和大宗财产的安全，如何定量地反映系统中计算机软件的安全性品质是一个值得探讨的问题。应从软件可靠性和安全性含义的讨论中，明确它们之间的区别。在此基础上，提出一种能定量反映计算机联锁安全软件安全性的评估策略，最后论述了对某制式铁路车站计算机联锁安全软件进行分级测试后，利用J－M可靠性模型对其进行安全性定量分析的方法。     

保护Linux下的Apache网站

Linux Apache的稳定性、安全性和性能以及低廉的价格正在赢得越来越多的市场份额,Linux平台下的Apache服务器,完全可以用Linux的方法来实现密码验证和保护. Linux下最常见的密码保护方法是利用.htaccess文件,使用.htaccess文件保护目录比使用其它更为有效和安全.使用.htaccess的方式进行设置,不需要编写程序就可以实现,具体操作比较容易.     

基于HOOK和过滤驱动的双层文件防泄密技术

在文件防护方面有着多种保护手段,以往传统的以口令的方式对文件进行保护的方式需要用户频繁的对文件进行加解密,这显然很繁琐,而透明防护即是以用户察觉不到的方式对文件进行保护.透明防护最关键的是对文档保护时文件泄密的情况,常用的透明防护技术有应用层HOOK和驱动层过滤技术,只采用单一的一种技术或多或少都会存在一些泄密的可能.一种好的解决方案是将两种技术加以结合并改进,对文档完整性、安全性进行有效防护,通过分别在应用层和驱动层插入一层HOOK和文件过滤驱动来实现.试验结果表明,该方案能堵住常见的各种泄密情况,安全稳定可靠,且不需要额外的硬件和软件支持,成本很低,不管是个人还是企事业单位都适合普遍采用.     

基于文件过滤驱动的文件保护技术研究

对Windows系统下文件保护技术进行了研究,并对其实现的关键技术作了详细分析.基于文件过滤驱动的文件保护技术通过文件系统过滤驱动和数字标识的应用,可以实现对文件严格的访问控制,为文件提供如隐藏、加密、文件重定向等的个性化保护功能,保护数据的机密性、完整性和真实性,从而有效维护文件系统安全.     

S1000D标准在航空装备维修技术资料上的应用研究

航空装备维修技术资料数据量大,目前主要沿用传统非结构化文件方式编制,数据关联度低、标准化程度差,给航空装备维修企业技术资料管理带来严重困扰.本文分析S1000D标准对航空装备维修技术资料进行结构化编码管理的方法和优势,结合目前企业实际情况,提出了一套技术资料结构化编码解决方案,以期逐步形成国内航空装备维修领域结构化编码通行标准.     

电子邮件的安全及PGP

讨论了电子邮件的安全问题和如何利用密码技术加以解决这些问题．并介绍了一种安全软件ＰＧＰ，它可用于Ｅ－ｍａｉｌ和文件的加密、签名     

文件保护系统的设计与实现

企业信息化要保持健康、可持续性发展,信息安全是基本的保证之一。为此,人们采取了一系列的措施来保护文件的安全,如防火墙、防黑客攻击以及数据加密等。本文综合国内外现有相关技术,设计并实现了一个文件保护系统,系统在对文件信息共享的同时,有效地控制授权用户对文件的各种操作,防范非授权用户非法获取文件,实现文件分发和使用过程的安全性和可控性。     

基于完整性的文件保护

分析了病毒对文件完整性的破坏，对此提出了使用公钥密码体制进行数字签名来保护文件完整性的方法。对这种保护机制进行了详细的讨论。用这种方法不仅能够抵御病毒对文件的破坏，而且能够抵御其它各种因素对文件的破坏。所给出的方法为遏制计算机病毒提供了一种手段。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that