浅析数据库安全技术

数据库是数据管理的最新技术,数据库系统的安全性也是当前计算机安全最重要的问题.系统讨论了保证数据安全所采取的技术手段和措施,包括身份认证、存取控制、数据加密、审计跟踪和攻击检测和数据恢复等.     

大数据背景下计算机安全漏洞检测技术研究

计算机对现代人的重要性不言而喻,但随之而来的一些计算机安全漏洞问题却也层出不穷。尤其是在当今的大数据背景下,伴随着海量数据的诞生,计算机安全漏洞问题也越来越复杂。大数据背景下计算机安全漏洞的本质在于信息交互的复杂性,其的种种漏洞,无论是出自于终端系统,或是网络协议,均可能会导致计算机安全运行条件的匮乏,继而引起一系列计算机安全问题。因此,当务之急是要进一步加强计算机安全漏洞检测技术研究,强化终端系统的安全运行效果。本文主要针对大数据背景下计算机安全漏洞检测技术进行了研究,希望有助于促进相关技术的进步与发展。     

计算机数据库入侵检测技术研究

伴随着我国科学技术的发展进步,计算机网络已经得到了前所未有的发展,并已经深入运用于日常生活之中。鉴于计算机网络呈现持续性和开放性,计算机安全问题也得到了更多人的重视,若计算机没有专业的安全防护系统,很可能造成重要文件被盗、经济财产损失等问题,而计算机数据库入侵检测技术能够很好地解决上述问题。所以,针对计算机数据库入侵问题进行检测,在保障计算机安全的同时,避免了不必要的经济财产损失。该文首先概述了计算机数据库入侵检测技术的实际功能,着重介绍了目前入侵检测技术中存有的不足,同时就先进的检测技术应用进行介绍,希望为提升计算机数据安全提供参考。     

计算机信息安全技术及其防护

随着互联网的广泛应用、电脑的日益普及,计算机安全问题迫在眉睫。本文试图从计算机安全的技术层面,分析探究计算机信息安全的防范之策。     

数字签名单机模拟系统

根据公开钥密码体制的计算机安全保密技术，设计并实现了数字签名单机系统，对明文能成功地进行加密、解密和数字签名，能抵抗一般的解码学攻击，保密性能良好。     

安全数据库的实现及评估标准

数据库安全是指保护数据库中数据不被非法访问和非法更新,并防止数据的泄露和丢失。保证数据库的安全涉及立法、管理和技术等多方面的问题,本文只讨论技术问题。一、安全数据库评估标准随着人们对安全问题认识和对安全产品的要求不断提高,在计算机安全技术方面逐步建立一套安全评估标准,以规范和指导安全信息的建立、安全产品的生产,并能较准确地评测产品的安全性能指标。在当前各国制定和采用的标准中,最重要的是1985年美国国防部颁布的“可信计算机系     

大数据时代下计算机网络安全防范

该文以大数据时代计算机安全防范的概念和特点介入点,简要阐述了强化网络安全防范的价值以及当前网络风险的常见种类和特征,在此基础上对现阶段计算机网络安全防范中存在的问题进行了分析,并从多个层面提出具体的防范策略。最后,从实际出发对大数据时代下计算机网络安全防范的运用进行简要分析,以期凸显大数据时代下计算机网络安全防范工作的重要性与价值,推动我国计算机网络安全防范水平的进一步提升。     

数据科学与大数据技术专业建设研究

数据科学与大数据技术专业作为国内最热门的新增专业被广泛关注,但是如何进行专业建设成为各高校的难点问题。论文对国内首批和二批开设数据科学与大数据技术专业的学校进行系统调研,重点从开设学院、人才培养、特色课程等方面进行总结分析,最后给出大数据专业在课程体系、师资队伍、实践平台等方面的问题及建议,为应用型本科高校专业建设提供参考。     

网络安全隔离GAP技术探析

计算机安全问题几乎随着计算机的产生而产生,特别是计算机网络的出现及其迅速发展,计算机安全问题越来越重要。而对各种网络安全问题,越来越发达的信息技术对信息安全提出了更高的要求。GAP技术即隔离网闸技术;隔离网闸技术是近几年来新兴的一种网络安全技术,它可以作为可信任网络和不可信任网络之间的一个强大的安全屏障。     

网络安全技术分析与探讨

随着计算机网络技术的日益发展和完善，面向内部局域网、全球互联网的资源共享和数据通信功能越来越受到人们的重视，在信息处理能力提高的同时，基于网络连接的安全问题也日益突出。人们对网络产品的安全要求越来越迫切，强有力的计算机安全技术及安全产品层出不穷。本文探讨了网络安全的现状以及几种主要网络安全技术。     

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.     

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     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with