一种WEB服务器“受侵检测系统”的设计与实现

入侵检测技术是近年来出现的一种新的计算机网络安全技术。由于该技术具有积极、主动的防卫性,使得其实现方法较为复杂,尚属研究阶段;而且成本较高,使得不少中小型WEB服务器用户望而却步。开发一种基于被动防卫的“受侵检测系统”．通过对web资源文件等进行实时监控,同时采用数据包嗅觉技术对IP数据包进行捕获、包解码并提取其中的TCP数据包;然后根据HTTP协议对TCP数据包中的数据项进行分析,从而实现对Web访问者的网络行为进行联动跟踪,实施对Web入侵者的检测;最后给出了Windows下Web服务器的一个可行的设计和实现方案。     

J/ψ→μ^＋μ^- reconstruction in the CMS experiment

In this paper the J/ψ→μ^＋μ^- reconstruction performance in the CMS experiment at the LHC is studied in detail by using B8→J/ψφ→μμKK events. The reconstruction efficiencies of J/ψ mesons and their decay muons are obtained as a function of the transverse momentum PT and the pseudo-rapidity η. We also study the muon trigger efficiency for this channel with the planned Level-1 trigger and High Level Trigger selection criteria. It was observed that the muon reconstruction efficiency decreases when the two decay muons have a small or large 3D angular separation, which further affects the overall J/ψ reconstruction efficiency.     

A Law of Gravitation for Complex Networks

Inspiring Newton＇s law of universal gravitation and empirical studies, we propose a concept of virtual network mass and network gravitational force in complex networks. Then a network gravitational model for complex networks is presented. In the model, each node in the network is described with its position, edges （links） and virtual network mass. The proposed model is examined by experiments to show its potential applications.     

软件随机数发生器设计的安全问题

随机数在应用程序中被广泛使用，很多的程序设计往往使用简单的线性适配随机发生器(函数)；由于它的可预测性，存在安全方面的隐患。因此，一个健壮的随机数发生器有着不可忽略的重要性．对Windows下健壮的随机数发生器的设计做了论述，并给出必要的实现代码。     

Feasibility study on cross-section measurement of Y（1S） →μ^＋μ- by using early CMS data

One of the first physics results that CMS will hopefully obtain will be the analysis of heavy quarkonium productions, including the Υ cross-section measurement. Since the Υ production cross-section from p-p collisions is expected to be relatively large, the analysis should be viable with rather small datasets which will be available soon after the start-up of the LHC. This paper describes the methods and plans for measuring the differential cross-section of Y（1S） →μ^＋μ- production, by using data to be collected from the CMS detector in the first LHC run. In this study, about 80 thousand Υ are reconstructed corresponding to an integrated luminosity of 6.4 pb^-1 in 10 TeV proton-proton collisions by using Monte Carlo data. The precision of this measurement is estimated to be about 16%, which is limited by the systematic errors.     

软件正弦波音频信号发生器的设计

详细介绍了软件正弦波音频信号发生器的开发。给出了Windows下基于PCM的一个正弦波音频信号发生器的实例和相关的VC 6．0下的程序代码。     

基于数据库技术的留声邮件系统

就基于数据库技术的留声邮件系统的设计和实现进行了探讨,并较详实地给出了Windows下基于Mirosoft SQL Server的留声邮件系统设计和实现的技术要点。留声邮件系统可进行有声信息交流,很具有开发前景。     

Feasibility study of a J/ψ cross section measurement with early CMS data

We report the methods and plans for measuring the differential cross section of J/ψ→μ^＋μ^- production, using data to be collected in the first LHC run by the CMS detector. Making use of the large B-hadron lifetime, we show how to separate the promptly produced J/ψ’s from those coming from B-hadron decays. Since the J/ψ production cross section is expected to be large, the analysis should be viable with relatively small data sets, that will become available early in the startup of the LHC. We also address effects of a non-perfect detector alignment, as well as systematic uncertainties. About 70 thousand J/ψ decays are reconstructed from Monte Carlo data, which corresponds to an integrated luminosity of 3 pb^-1 in 14 TeV collisions, in the range of pT^J/ ψbetween 5 and 40 GeV/c. The precision of the result is limited by systematic uncertainties, and is at the 15% level.     

IPv6＆IPv4的寻址程序设计

文中详尽介绍了在Window系统中,如何实现IPv6&IPv4的IP寻址,并给出了Visual C++6..0下基于Winsock API的程序代码和一个应用实例。     

基于WinNT DACL的应用开发安全设计

在NT系统中,利用授权访问控制列表机制,可以指定不同用户的访问类型,如读、写及执行权限;基于DACL．可以实现应用开发的一般安全设计。同时给出了VC＋＋6．0下的设计和实现的程序所必需的代码说明。