一种基于混合模型的离子单通道信号重构算法研究

细胞膜离子单通道信号是皮安级的随机离子电流,膜片钳技术记录中单通道电流往往被淹没在强背景噪声中.本文提出了一种隐马尔可夫模型(HMM)和径向基函数(RBF)神经网络相结合的混合模型,用于白噪声背景下细胞膜离子单通道电流的统计重构.该方法首先采用RBF网络强大的模式分类能力,确定离子单通道信号的电流幅值水平;然后利用HMM模型强时序信号处理能力,估计通道的动力学参数.在此基础上,从强噪声污染的膜片钳记录中统计重构理想化的通道电流信号.理论和仿真实验结果表明,在低信噪比情况下(SNR＜5.0),该混合模型重构信号精度高,且具有较强的噪声鲁棒性.     

基于隐马尔可夫模型的用户行为异常检测新方法

提出一种基于隐马尔可夫模型的用户行为异常检测方法,主要用于以shell命令为审计数据的主机型入侵检测系统。与Lane T提出的检测方法相比,所提出的方法改进了对用户行为模式和行为轮廓的表示方式,在HMM的训练中采用了运算量较小的序列匹配方法,并基于状态序列出现概率对被监测用户的行为进行判决。实验表明,此方法具有很高的检测准确度和较强的可操作性。     

Local Hidden Variables Underpinning of Entanglement and Teleportation

Entangled states whose Wigner functions are non-negative may be viewed as being accounted for by local hidden variables (LHV). Recently, there were studies of Bell’s inequality violation (BIQV) for such states in conjunction with the well known theorem of Bell that precludes BIQV for theories that have LHV underpinning. We extend these studies to teleportation which is also based on entanglement. We investigate if, to what extent, and under what conditions may teleportation be accounted for via LHV theory. Our study allows us to expose the role of various quantum requirements. These are, e.g., the uncertainty relation among non-commuting operators, and the no-cloning theorem which forces the complete elimination of the teleported state at its initial port.     

Investment optimization on port’s development by fuzzy integer programming

In this research, the main purpose is to formulate a model to determine the optimum investment on port development from national investment prospective; on the other hand, costs and benefits are calculated from consumer and investor’s viewpoint. The formulated model is an integer-programming model. The emphasis is on how to formulate an investment optimization problem where cargo operation, investment costs, cargo-handling capacity, cargo transportation network, and the world maritime fleet constraints are included. Fuzzy numbers are used for cargo forecast study results. The output of the model is the type of design ships and design berths which are needed in each sub period, so that the port planner (the government) will find out the optimum development plan of port in each sub period when there is uncertainty in cargo handling forecast (fuzzy numbers).     

Parameter estimation of hidden periodic model in random fields

Two-dimensional hidden periodic model is an important model in random fields. The model is used in the field of two-dimensional signal processing, prediction and spectral analysis. A method of estimating the parameters for the model is designed. The strong consistency of the estimators is proved. Project supported by the National Natural Science Foundation of China (Grant No. 19571002).     

Intelnet Services—A global data distribution and collection scheme

Responding to the recent availability of very small earth-stations (commonly called micro terminals) for data/voice communications, INTELSAT has introduced a new service called INTELNET. INTELNET services are designed to operate with two different modulation and coding techniques, i.e. spread spectrum and binary phase-shift keying (BPSK) with rate 1/2 forward error correction (FEC). The INTELNET I service is a data distribution service, whereas the INTELNET II service is a data collection service. These services are facilitated by the use of micro terminals at remote locations (i.e. outposts) which will be linked through the INTELSAT space segment to relatively large INTELSAT earth-stations (e.g. Standard A, B, C and E-3). INTELNET services are leased transponder services offered on a range of INTELSAT satellites in C- or Ku-bands on a pre-emptible or non-pre-emptible basis. These services are offered on a full-time or occasional-use basis, by assigning predetermined satellite resources of bandwidth and power with a smallest allotment of 1 MHz. In this paper, the system design and network architecture for the INTELNET I and II services are addressed. Representative transmission parameters have also been developed for the INTELNET I and II services. System cost considerations as a result of the use of micro terminals are analysed.     

单晶SiNd：YAG激光连续退火的数值计算

应用固相外延模型来模拟单晶Si的连续Nd：YAG激光退火过程,在低功率密度连续激光退火下,用准静态模型模拟辐照区向非辐照区的径向传导散热。在数值计算中，应用部分线性法处理非线性非齐次热传导方程,得到相应的隐格式差分方程，再用追赶法求解隐格式差分方程,得出绝热边界条件下的温度的时间和空间分布，从而得出激光退火的再结晶厚度。当激光波长λ=1．06μm、功率密度io=700W／cm^2。预热温度T0=523K时，经过0．7秒，表面温度度升到1290K左右，再结晶厚度约为0．5μm。     

GSM信息安全性研究

本文结合国内的实际情况,通过介绍GSM系统的体系结构,分析了其在系统安全性方面采取的主要措施,也指出了存在的一些潜在安全隐患。     

Generating Multidirectional Variable Hidden Attractors via Newly Commensurate and Incommensurate Non-Equilibrium Fractional-Order Chaotic Systems

This article investigates a non-equilibrium chaotic system in view of commensurate and incommensurate fractional orders and with only one signum function. By varying some values of the fractional-order derivative together with some parameter values of the proposed system, different dynamical behaviors of the system are explored and discussed via several numerical simulations. This system displays complex hidden dynamics such as inversion property, chaotic bursting oscillation, multistabilty, and coexisting attractors. Besides, by means of adapting certain controlled constants, it is shown that this system possesses a three-variable offset boosting system. In conformity with the performed simulations, it also turns out that the resultant hidden attractors can be distributively ordered in a grid of three dimensions, a lattice of two dimensions, a line of one dimension, and even arbitrariness in the phase space. Through considering the Caputo fractional-order operator in all performed simulations, phase portraits in two- and three-dimensional projections, Lyapunov exponents, and the bifurcation diagrams are numerically reported in this work as beneficial exit results.