关于矩阵方程AXB=CYD

应用矩阵的初等变换技巧，给出了任意域上矩阵方程AXB=CYD的通用表达式及解法。     

Evaluation of the drag force by integrating the energy dissipation rate in stokes flow for 2D domains using the FEM

The total drag force on the surface of a body, which is the sum of the form drag and the skin friction drag in a 2D domain, is numerically evaluated by integrating the energy dissipation rate in the whole domain for an incompressible Stokes fluid. The finite element method is used to calculate both the energy dissipation rate in the whole domain as well as the drag on the boundary of the body. The evaluation of the drag and the energy dissipation rate are post-processing operations which are carried out after the velocity field and the pressure field for the flow over a particular profile have been obtained. The results obtained for the flow over three different but constant area profiles—a circle, an ellipse and a cross-section of a prolate spheroid—with uniform inlet velocity are presented and it is shown that the total drag force times the velocity is equal to the total energy dissipation rate in the entire finite flow domain. Hence, by calculating the energy dissipation rate in the domain with unit velocity specified at the far-field boundary enclosing the domain, the drag force on the boundary of the body can be obtained.     

一个检测超流的早期淘汰算法

超流是网络中具有大量不同宿IP/源IP链接的源IP/宿IP.实时检测出高速网络（OC48、OC192等）中的超流对网络安全具有非常重要的意义.近年来已经有论文提出了不同超流检测算法,但是这些算法都没有考虑控制测量过程中超流缓存空间的大小.论文在超流检测过程中增加了早期淘汰功能,将超流缓存中链接数较少的记录提前淘汰,以便腾出空间用于存储新检测到的IP记录,实现对超流缓存资源的控制.论文最后还使用实际网络日志数据对算法进行验证,实验表明：早期淘汰算法可以使系统以更少的内存空间和测量资源检测超流信息.     

佛山市城市公共交通发展策略

通过对佛山市公共交通客流和公共交通设施现状的调查，掌握了居民出行规律和客运交通特征指标．采用定性和定量相结合的方法，综合评价了公共交通现状的水平．在分析佛山市未来社会经济、城市发展基本特征的基础上，根据客流分布特点、发展态势及客流交通的生成变化特征，采用经验加模型系统方法，科学地预测发展需求．结合佛山市的实际，分析了公共交通的优劣势，确定了优先发展公共交通的方针与目标．对公共交通政策进行了研究，并提出确保实施公共交通目标的对策和措施     

交通繁忙地段T梁采用横移落梁架设施工技术

介绍了在交通繁忙的狭窄地带T梁架设采用横移落梁的施工方法、有关注意事项及在设计上采取的相应措施。     

Stability of the Sarcin/Ricin domain of 28S RNA in rat ribosome under hydrostatic pressure

Under 2 100 bar of hydrostatic pressure, KNA N-glycosidase can still cleave the N-C bond of adenosine at position 4324 in R/S domain of 28S RNA in rat ribosome, demonstrating that high pressure has no effect on the tertiary structure of S/R domain.     

THE STRUCTURAL BASIS OF THE POOR FIBRIN SPECIFICITY OF UROKINASE(Ⅰ)——KNOWLEDGE-BASED PREDICTION OF KRINGLE STRUCTURES OF UROKINASE AND ITS RELATED PROTEINS

The Kringle-1 structure of plasminogen (PGK-1), the Kringle-2 structure of tissue plasminogen activator (PAK-2) and the Kringle structure of prourokinase (UKK) has been modeled on the basis of the three-dimensional structure of Kringle-1 of prothrombin (PTK-1) at 2.8 resolution. The predicted three-dimensional structure of these Kringles shows that the binding site of PGK-1 is characterized by an apparent dipolar site, the polar parts of which are separated by a hydrophobic region. PAK-2 possesses the anionic center but has not a cationic binding center which might be provided by a guanidinium group from Arg-69 located adjacent to the Arg-71 position. UKK possesses neither the anionic binding center nor the cationic center which are probably the main reason for the poor fibrin specificity of urokinase.     

一种液晶环氧树脂固化中扩散控制动力学研究

根据扩散控制反应的基本原理 ,建立了合适的反应模型 ,描述了 4 ,4′ 二 ( 2 ,3 环氧丙氧基 )偶氮苯(DGEAP) / 4,4′ 二氨基二苯甲烷 (DDM)环氧树脂的固化行为 .该模型认为 ,随着环氧基团反应程度的提高 ,基团的反应半径将受到影响 .当体系中出现了介晶基元的有序排列时 ,与之相连的反应基团的分布也受到影响 ,有序区内的局部浓度将变大 ,产生假浓度效应 ,并最终影响扩散控制反应动力学 .通过与普通环氧树脂固化动力学的比较 ,证实了这一效应 .     

The domain of partial attraction of a Poisson law

Groshev gave a characterization of the union of domains of partial attraction of all Poisson laws in 1941. His classical condition is expressed by the underlying distribution function and disguises the role of the mean of the attracting distribution. In the present paper we start out from results of the recent probabilistic approach and derive characterizations for any fixed >0 in terms of the underlying quantile function. The approach identifies the portion of the sample that contributes the limiting Poisson behavior of the sum, delineates the effect of extreme values, and leads to necessary and sufficient conditions all involving . It turns out that the limiting Poisson distributions arise in two qualitatively different ways depending upon whether >1 or <1. A concrete construction, illustrating all the results, also shows that in the boundary case when =1 both possibilities may occur.     

DoS攻击流量的监测与分析

介绍了DoS攻击的概念、原理和危害，说明了当前抵御DoS攻击的现状，提出了监测和分析DoS攻击流量的几种方法。最后对未来的一些抵御DoS攻击的技术进行了讨论。