光纤网络断点数据提取方法研究

对光纤网络断点数据进行自动提取,是提升光纤网络安全性的有效方法,传统的光纤网络断点数据提取方法提取到的数据辨识度较低,无法在根本上提高网络安全性,为此提出一种基于遗传算法的光纤网络断点数据提取方法研究。通过构建光纤网络节点断点数据分布模型、断点数据特征信息采集、断点数据固定处理、断点数据提取优化四个阶段,实现光纤网络断点数据提取方法研究。仿真结果表明,采用该方法进行光纤网络断点数据提取的辨识度较高,对光纤网络断点数据固定能力较强,提高了光纤网络断点数据的提取能力。     

具有e指数关联噪声的单模激光的光强关联函数和含时矩

利用线性近似方法 ,推导了由e指数关联噪声驱动的单模激光增益模型的光强关联函数和含时矩 ,利用计算机技术分析了它们随时间的演化特征 ,发现了一些奇特的现象 ,即在一定条件下 ,光强关联函数及含时矩随时间的演化曲线均会出现双极值     

Simulation of vertical merged MOS elements with optical power supply

Functional optoelectronic vertical merged MOS (OVMMOS) elements with optical power supply increasing the packaging density for advanced high-speed low-voltage low-power deep-submicron ULSI are considered. Two types of new OVVMOS logical elements are proposed, analyzed and simulated. The simple reduced but adequate numerical electrical-optical model for the OVMMOS is formulated. Low-voltage low-power OVMMOS with combined channels for electrons and holes to increase integration level are simulated using two-dimensional (2D)-numerical device simulators. The problems of low light power operations and optimizations of OVMMOS elements are investigated using 2D simulators.     

数据流异常检测及其在僵尸网络检测中的应用

目前大多关于P2P僵尸网络检测的研究都采用传统的逆向工程方法,这些方法检测都比较准确,但其工程实施难度太大,效率较低,且对于变种病毒,该类检测方法无能为力。本文尝试通过数据流异常检测技术的应用,找到一种适合数据流应用场景的异常检测方法,并尝试将其应用于P2P僵尸病毒的检测当中,通过监控网络数据流,能够有效地发现P2P僵尸病毒在传播过程当中的特殊行为,并通过捕获这些行为来实现发现僵尸主机的目的。     

IP环境下时钟同步网模型和指标的探讨

探讨和分析了时钟同步网指标和移动基站指标,结合本地网时间指标的分析,尝试给出了IP环境下同步网模型和指标分配。讨论的重点是时钟同步网,并在一定程度上论述了时间同步网。     

基于多Agent的金融生态评价模型

为了高效地评价金融生态环境,建立金融生态评价模型是核心部分。文中基于多Agent技术构建在区域和时间上自适应的金融生态环境评价指标体系,建立智能化的金融生态环境评价模型,使得金融生态环境评价研究具有科学性、智能性、发展性,为培植良好的金融生态环境奠定了基础。     

Self-Adaptive Topic Model： A Solution to the Problem of ＂Rich Topics Get Richer＂

The problem of ＂rich topics get richer＂（RTGR） is popular to the topic models,which will bring the wrong topic distribution if the distributing process has not been intervened.In standard LDA（Latent Dirichlet Allocation） model,each word in all the documents has the same statistical ability.In fact,the words have different impact towards different topics.Under the guidance of this thought,we extend ILDA（Infinite LDA） by considering the bias role of words to divide the topics.We propose a self-adaptive topic model to overcome the RTGR problem specifically.The model proposed in this paper is adapted to three questions：（1） the topic number is changeable with the collection of the documents,which is suitable for the dynamic data;（2） the words have discriminating attributes to topic distribution;（3） a selfadaptive method is used to realize the automatic re-sampling.To verify our model,we design a topic evolution analysis system which can realize the following functions：the topic classification in each cycle,the topic correlation in the adjacent cycles and the strength calculation of the sub topics in the order.The experiment both on NIPS corpus and our self-built news collections showed that the system could meet the given demand,the result was feasible.     

软件信息化风险管理研究

IT系统建设普遍具有投入高、业务影响广、安全要求高等特点,系统建设的不确定因素比较多,具有很强的风险性,加强软件项目的信息化风险管理,对于提高软件系统建设的成功率具有重要意义。本文结合公司软件项目实施,对公司软件项目的信息化风险管理进行了研究与分析,构建了公司软件项目全面风险管理体系,体系由八个相互关联的模块组成,分别是风险管理环境,风险管理目标与政策设定,风险监测与识别,风险评估,风险定价与处置,内部控制,风险信息处理和报告,风险持续改进。     

无刷直流电机双闭环串级控制系统仿真研究

为了有效地分析和设计BLDCM控制系统,基于Matlab提出了一种新型的模块化的BLDCM控制系统仿真建模的方法。对各个模块进行了详细说明。最后,采用经典的速度、电流双闭环控制方法对该建模方法进行了仿真测试。结果表明仿真波形符合理论分析。转速环引入了积分分离的PI调节器使超调量为零,系统特性稳定,它为实际系统设计和调试...     

A critical analysis of Z-source converters considering the effects of internal resistances

Nowadays Z-source networks are the most promising power converter networks that cover almost all electric power conversion (dc–dc, dc–ac, ac–dc and ac–ac) applications. However, the controller design is critical for Z-source converter (ZSC) due to the presence right-half-plane zero (RHPZ) in the control-to-capacitor-voltage transfer function. This RHPZ exhibits non-minimum phase undershoot in the capacitor voltage and also in the dc-link voltage waveforms. A perfect small-signal model is required to predict locations of the RHP zero and its dynamics. This paper contributes towards the small-signal analysis of ZSC under continuous conduction mode considering the parasitic resistance of the inductor, equivalent series resistance of the capacitor, internal resistances of active switch and forward voltage drop of the diode. The maximum allowable value of shoot-through duty ratio (STDR) and voltage gain for different values of the internal resistance and load resistance are discussed in this paper. The accuracy of the developed small-signal average model is compared with detailed circuit model in MATLAB/SIMULINK. Finally, the steady-state simulation results of ZSC are validated with hardware results.