高速实时的一种邮件蠕虫异常检测模型

提出了一种基于带泄漏的积分触发测量方法的电子邮件蠕虫异常检测方法,用来检测邮件蠕虫在传播过程中的流量异常。根据邮件流量所表现出的明显的日周期特性和周周期特性,首先计算出当前邮件流量和历史邮件流量的最小Hellinger距离,通过带泄漏的积分触发方法把邮件流量的Hellinger积累起来,从而把邮件蠕虫在传播过程中没有明显流量特征的慢速酝酿阶段的异常特征进行积累,达到在其进入快速传播期之前检测出异常的目的。检测过程只需要检查邮件的流量信息,因而适合大规模高速网络的异常检测。     

电缆隧道消防PLC控制系统

以武钢第三炼钢厂电缆隧为例，介绍了中编程序控制器（ＰＬＣ）的消防自动控制系统的构成以及ＰＬＣ系统配置、通讯系统的软硬件设计特点，并预示电缆隧道消防系统发展的趋势。     

Isotropic Evolution of a JBD Anisotropic Bianchi Universe

I study the dynamical effects due to the Brans-Dicke scalar -field at the early stages of a supposedly anisotropic Universe expansion in the scalar-tensor cosmology of Jordan-Brans-Dicke. This is done considering the behaviour of the general solutions for the homogeneous model of Bianchi type VII in the vacuum case. I conclude that the Bianchi-VII₀ model shows an isotropic expansion and that its only physical solution is equivalent to a Friedman-Robertson-Walker spacetime whose evolution can, depending on the value of the JBD coupling constant, begin in a singularity and, after expanding (inflating, if > 0), shrink to another, or starting in a non-singular state, collapse to a singularity. I also conclude that the general Bianchi-VII _h (with h 0) models show strong curvature singularities producing a complete collapse of the homogeneity surfaces to 2D-manifolds, to 1D-manifolds or to single points. Our analysis depends crucially on the introduction of the so-called intrinsic time, , as the product of the JBD scalar field times a mean scale factor a ³ = a ₁ a ₂ a ₃, in which the finite-cosmological-time evolution of this universe unfolds into an infinite -range. These universes isotropize from an anisotropic initial state, thence I conclude that they are stable against anisotropic perturbations.     

An Approach to Early Prediction of Software Quality

Due to the rapid development of computers and their applications,early software quality prediction in software industry becomes more and more crucial. Software quality prediction model is very helpful for decision-makings such as the allocation of resource in module verification and validation. Nevertheless,due to the complicated situations of software development process in the early stage,the applicability and accuracy of these models are still under research. In this paper,a software quality prediction model based on a fuzzy neural network is presented,which takes into account both the internal factors and external factors of software. With hybrid-learning algorithm,the proposed model can deal with multiple forms of data as well as incomplete information,which helps identify design errors early and avoid expensive rework.     

预警的概念及相关物理问题

预警是现代社会减轻自然灾害的工作中最重要的物理概念之一,也是在预测/预报的物理问题没有得到解决的情况下最具实际意义的技术之一.文章介绍了与预警有关的概念和物理问题,包括预报和预警的概念,现地预警和异地预警,讨论了不同领域的预警技术中共同的物理问题,包括“有限传播”原理、“连锁效应”原理、“相似放大”原理,以及实际工作对预警系统的主要技术要求.     

火灾烟气危害性气体在狭长通道内水平方向迁移的模拟实验研究

利用狭长通道的小型实验台模拟研究了火灾烟气毒性成分在水平方向上的迁移规律.结果发现,火灾烟气危害性成分水平方向上的演变非常相似,而不同高度水平面上的烟气成分浓度有些差别,这主要是建筑结构中各种开口或者空气流动造成的.数据表明,CO等气体到达浓度峰值的时间随着高度的降低而逐渐增加.其中,O2和CO2到达峰值的时间比较一致,而CO则与前两者不一致,整体滞后80秒左右,这可能因为热烟气在传播过程又新生成了CO.     

航空火力控制的攻击瞄准方法综述

介绍了空空、空地、制导与非制导武器所使用的各种攻击方式及瞄准方法。     

医院感染实时监测和预警系统在临床护理中的应用效果调查

目的 :对医院感染实时监测和预警系统在临床中的应用效果进行分析和研究。方法 :所选用B/S构架及J2EE的新开发技术,后台的数据库系统是以SQL SERVER为主,后台的数据库系统是可以与目前各个医院信息系统相连接的,是医院感染管理信息系统得到有力的开发。结果 :对医院感染所发生的发病情况和因素进行实时监测和预警系统,可以起到有效安全的检测和统计功能。结论 :通过对医院感染进行实时的检测和预警系统在临床中的实践应用效果,使医院感染检测的安全性和准确性得到充分的提高,同时也大大提高了医院感染管理的质量和效果。     

火灾报警消防联动控制系统的漏报率和误报率及系统设计的研究

探讨了火灾报警系统的漏报率和误报率，并针对火灾报警系统的漏报率和误报率提出了火灾报警消防联动系统设计数学模型和设计方法。     

Driven torsion pendulum for measuring the complex shear modulus in a steady shear flow

To investigate the viscoelastic behavior of fluid dispersions under steady shear flow conditions, an apparatus for parallel superimposed oscillations has been constructed which consists of a rotating cup containing the liquid under investigation in which a torsional pendulum is immersed. By measuring the resonance frequency and bandwidth of the resonator in both liquid and in air, the frequency and steady-shear-rate-dependent complex shear modulus can be obtained. By exchange of the resonator lumps it is possible to use the instrument at four different frequencies: 85, 284, 740, and 2440 Hz while the steady shear rate can be varied from 1 to 55 s^–1. After treatment of the theoretical background, design, and measuring procedure, the calibration with a number of Newtonian liquids is described and the accuracy of the instrument is discussed.Notation a radius of the lump - A geometrical constant - b inner radius of the sample holder - c constant - C ₁, C ₂ apparatus constants - D damping of the pendulum - e _x , e _y , e _z Cartesian basis - e _r , e , e _z orthonormal cylindrical basis - E geometrical constant - E _t , ⁰ E _t , _t relative strain tensor - f function of shear rate - F _t relative deformation tensor - G (t) memory function - G ^* complex shear modulus - G Re(G ^* ) - G Im(G ^* ) - h distance between plates - H ^* transfer function - , functional - i imaginary unit: i ²= – 1 - I moment of inertia - J _exc excitation current - J ₀ amplitude of J _exc - k ^* = k – ik complex wave number - K torsional constant - K fourth order tensor - l length of the lump - L mutual inductance - M _dr driving torque - M _liq torque exerted by the liquid - ⁰ M _liq, _liq steady state and dynamic part of Mliq - n power of the shear rate - p isotropic pressure - Q quality factor - r radial position - R,R ₀, R _c Re(Z ^*, Z ₀ ^* , Z _c ^* ) - s time - t, t time - T temperature - T, ⁰ T, stress tensor - u velocity - U lock-in output - ₀ velocity - V _det detector output voltage - V _sig, V _cr signal and cross-talk part of V _det - x Cartesian coordinate - X , X ₀, X _c Im(Z ^*, Z ₀ ^* , Z _c ^* ) - y Cartesian coordinate - z Cartesian coordinate, axial position