An Intrusion Alarming System Based on Self-Similarity of Network Traffic

Intrusion detection system can make effective alarm for illegality of network users, which is absolutely necessarily and important to build security environment of communication base service. According to the principle that the number of network traffic can affect the degree of self-similar traffic, the paper investigates the variety of self-similarity resulted from unconventional network traffic. A network traffic model based on normal behaviors of user is proposed and the Hurst parameter of this model can be calculated. By comparing the Hurst parameter of normal traffic and the self-similar parameter, we can judge whether the network is normal or not and alarm in time.     

Mlgebraic Attack on Filter-Combiner Model Keystream Generators

Algebraic attack was applied to attack Filter-Combiner model keystream generators. We proposed thetechnique of function composition to improve the model, and the improved model can resist the algebraic attack. A new criterion for designing Filter-Combiner model was also proposed: the total length L of Linear Finite State Machines used in the model should be large enough and the degree d of Filter-Combiner function should be approximate [L/2].     

Dispatch Liquidity Theory in a Deregulated Environment

Power system security and reliability are more complex issues in a deregulated environment.Various criteria have been considered for power system reliability. In the day-ahead market, a successful trade schedule should be able to accept various disturbances with sufficient flexibility to be adjusted during the re-dispatch process. This paper describes the dispatch liquidity theory and some liquidity indices. The liquidity indices evaluate the effective operating reserves with the network constraints taken into consideration. A model is presented to calculate the liquidity index. An extended trade scheduling model with minimum liquidity index constraints is presented that considers the distribution requirements of the operating reserves. The liquidity indices could also be used to coordinate the security and reliability between multistage markets and for contingency selection. The algorithms were tested with real power system data. The results show that the dispatch liquidity theory is reasonable and the algorithms are effective.     

垂直主振系冲击消振运动过程分析及仿真研究

提出一种垂直主振系冲击消振力学模型，在此基础上对该模型的典型运动过程进行了定性分析，并使用MATLAB的Simulink组件建立了仿真模型，对系统的运动性状进行的初步研究，为以后的相关理论研究打下了一定基础。     

Mesoscale eddy effects on the wintertime vertical mixing in the formation region of the North Pacific Subtropical Mode Water

Mesoscale eddy effects on the wintertime vertical mixing in the formation region of the North Pacific Subtropical Mode Water （NPSTMW） are studied using hydrographic data from Argo profiling floats deployed in the Kuroshio recirculation region in February and March of 2001. Anticyclonic （warm） eddy enhances the wintertime vertical mixing and results in the deep mixed layer and the deep thermocline. Consequently, a large volumetric water mass with low potential vorticity corresponding to the prototype of NPSTMW tends to be formed. By contrast, cyclonic （cold） eddy is unfavorable for the vertical mixing process and halts the deepening of the mixed layer and thus the formation of mode water. Further analysis shows that cyclonic eddies prevail in the late 1990s in the formation region of NPSTMW, which lead to significant suppression of the wintertime vertical mixing （96-98） and thus are unfavorable for the formation of NPSTMW; while the situation is completely reversed in the early 1990s （93-95）.     

CO(■∏,v=3)转动传能中Λ-相关的量子干涉效应

理论模型基于一级含时波恩近似,考虑各项异性相互作用势,在此基础上给出了原子与1∏态双原子分子体系的积分干涉角.     

明渠非恒定流及输沙试验系统

为研究明渠非恒定流运动特性和输沙机理,建立了长20m,宽29.5cm,高40cm的水槽非恒定流实验系统。该系统包括变坡水槽、供水控制、水位和流速量测、推移质循环及测量5个部分。通过计算机控制生成设定的非恒定流过程;沿水槽架设的6个压力传感器监控沿水槽的水位变化;采用二维激光流速仪测量垂线流速分布。初步试验结果表明:该系统可以生成稳定可重复的非恒定流过程,得到包括水深、流量、流速及输沙率变化的大量非恒定流试验数据,为洪水波的运动特性及输沙特性研究奠定了基础。     

关于富足0-■-单半群的注记

在富足0-■-单半群中,根据完全0-单半群的4个等价条件对应地引入了3个条件,研究了本原富足0-■-单半群与其它3个所提出条件的相互关系.     

M(II)-氨基酸水杨醛席夫碱-ATP三元配合物稳定性研究

用pH电位滴定法测定了Zn2+,Cu2+,Ni2+和Co2+与氨基酸水杨醛席夫碱及ATP形成的三元配合物的稳定常数,发现logβ111与pk2之间存在很好的线性自由能关系,研究了三元配合物中配体间的疏水相互作用.     

球形气泡在匀速粘性液体中引起的伪湍动

为改进在势流假设下获得的伪湍动表达式,该文在考虑液体粘性的基础上,简化匀速粘性液体绕球体的速度场,运用单元系综平均方法对流场进行处理,得到球形气泡在匀速粘性液体中引起的伪湍动关系式。该关系式表明伪湍动与空泡率成正比,并随颗粒R eyno lds数的增大而趋近势流结果。数据对比结果表明:在低空泡率、中等颗粒R eyno lds数的条件下,该表达式能比势流模型更准确地描述球型气泡在匀速粘性液体中引起的伪湍动。