端口扫描技术及防御分析

针对目前端口扫描器给网络安全带来的威胁,文中系统地分析了端口扫描的技术基础和实现方式.针对扫描带来的威胁,给出了一些防御的方法.在实际使用中具有一定的现实意义.     

探析Android智能手机安全威胁的应对措施

智能手机已成为大多数人的生活必须品,它丰富了我们的生活,但同时也给我们的生活带来不少安全威胁,特别是Android智能手机。由于Android智能手机操作系统是基于Linux内核,其开放性所引起的安全威胁更加突出,主要表现在:Android系统存在的安全威胁、APP存在的安全威胁和手机病毒入侵。本人针对其安全威胁,探析其应对措施,减少用户因使用Android智能手机带来的安全威胁。     

趋势科技IGSA打造苏州新区自来水公司健康网络

互联网的普及给企业发展带来了前所未有的机遇，同时也为恶意攻击者造就了一个新的乐园。据安全专家分析，Web威胁已经成为当今企业面临的头号安全威胁，员工正常的浏览网页就有可能带来极大的安全风险，轻则影响个人工作效率，重则造成企业数据资产丢失、关键业务停止等后果。如何将安全威胁拒于企业内网之外，已经成为摆在企业面前不可回避的关键问题。     

DLL木马的原理及其防范策略

随着计算机网络技术的发展，近几年来各种类型的东马大量出现，给计算机网络安全带来了很大威胁。但最近又出现了一种有别于以往水马的新类型——DLL东马，它隐蔽性强，不易查杀：文中分析了DLL东马的工作原理和它的入侵过程．指出了针对这种水马的防范策略。     

无线局域网安全问题与解决办法

由于无线局域网没有有线网络的线缆羁绊,因此在网络构建以及用户移动性方面都比有线网络更加方便、灵活。该文从无线网络的特点出发,分析了无线网络可能受到的各种威胁,包括由于无线网络本身的技术缺陷带来的威胁,以及一些偶然威胁。并针对这些威胁从技术到人员等方面提出了解决方案,可以有效地提高无线网络的安全性。     

浅谈政府机关计算机网络安全

如今政府机关办公已离不开计算机网络,但由于黑客、恶意软件的存在,给机关计算机网络安全带来了很大的威胁。文章主要针对目前计算机网络面临的主要安全威胁,结合机关网络特点,在技术层和管理层上提出一些防范对策。     

MAC系统频遭木马攻击

自10月份以来,互联网黑客针对MAC系统的攻击愈演愈烈,10月统计有超过四种新木马针对MAC用户计算机安全带来了严重的威胁。近日,又出现了一款隐藏在Mac OSX系统应用程序的新木马程序——DevilRobbe。     

IE浏览器的安全防范策略初探

因特网的发展给人们带来极大的信息获取和通讯便利。与此同时,网络环境下针对浏览器的攻击手段也层出不穷,恶意网页成了网络用户的最大威胁之一,不但对用户信息的安全造成了很大的隐患,也给网络用户带来了麻烦。如何安全防范针对浏览器的病毒攻击已成为网络用户亟待解决的问题之一。     

虚拟机系统安全综述

随着云计算的广泛应用,虚拟机技术得到了复苏和长足的发展,但同时也带来了新的安全威胁,因此对于虚拟机的安全威胁和防御的研究成为目前计算机安全界的研究热点。以目前广泛应用的虚拟机Xen为例,针对虚拟机的技术特征分析了所存在的漏洞和威胁,并从计算机安全学的角度提出了相应的防御和保护方法。较为全面地总结了目前国内外针对虚拟机安全各方面相关的研究成果,通过系统的比较分析,指出了目前存在的问题,探讨了下一步的研究方向。     

浅谈办公网络中防火墙技术的应用

计算机技术的发展给人们生活带来了极大的便利,但同时由于计算机黑客和计算机病毒的入侵,也给人们信息安全带来了很大的威胁,本文针对目前计算机网络安全现状,重点从网络防火墙的角度进行分析,旨在提高防火墙在计算机网络安全中的作用。     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.