Sooner and later waiting time problems in a two-state Markov chain

LetX ₁,X ₂,... be a time-homogeneous {0, 1}-valued Markov chain. LetF ₀ be the event thatl runs of 0 of lengthr occur and letF ₁ be the event thatm runs of 1 of lengthk occur in the sequenceX ₁,X ₂, ... We obtained the recurrence relations of the probability generating functions of the distributions of the waiting time for the sooner and later occurring events betweenF ₀ andF ₁ by the non-overlapping way of counting and overlapping way of counting. We also obtained the recurrence relations of the probability generating functions of the distributions of the sooner and later waiting time by the non-overlapping way of counting of 0-runs of lengthr or more and 1-runs of lengthk or more.     

Effectiveness of graph-based and fingerprint-based similarity measures for virtual screening of 2D chemical structure databases

This paper reports an evaluation of both graph-based and fingerprint-based measures of structural similarity, when used for virtual screening of sets of 2D molecules drawn from the MDDR and ID Alert databases. The graph-based measures employ a new maximum common edge subgraph isomorphism algorithm, called RASCAL, with several similarity coefficients described previously for quantifying the similarity between pairs of graphs. The effectiveness of these graph-based searches is compared with that resulting from similarity searches using BCI, Daylight and Unity 2D fingerprints. Our results suggest that graph-based approaches provide an effective complement to existing fingerprint-based approaches to virtual screening.     

基于有限回传链路的小基站网络重叠协作方法研究

采用一种小区间重叠协作的方法,解决了基于有限回传链路的小基站网络中的干扰管理问题。提出了一种新的基于下行协同波束赋形的小区间重叠协作算法,用于消除小基站网络中不同小基站之间的下行干扰,提高系统吞吐量。仿真结果显示,提出的算法能够显著提升以吞吐量为指标的系统性能。     

A cost-effective ultra-dense WDM PON system with speed of 12.5 Gbit/s and channel spacing of 12.5 GHz

In this paper, an experimental scheme for cordwood color division multiplexing（CDM） visible light communication（VLC） system is proposed. The principle and structure of the experimental scheme are described. Right angle prisms and band-pass filter are used to make the unit of the optical collector and splitter. We can add or subtract the unit as we need. The cordwood CDM-VLC system can also be effectively used as a model to accomplish color shift keying and color division duplexing. The experimental system provides a new way for researching VLC.     

光波导放大器中的光场与铒浓度分析之间重迭的分析

本文在忽略放大自发辐射（ASE）和上转过程影响的情况下,用重迭因子的方法,得到了980nm波段泵浦的掺饵光波导放大器增益的隐式解析解、泵浦光沿波导方向分布的函数关系式和泵浦阈值功率的解析表达式。详细讨论了重迭因子对增益、泵浦阈值功率和波导中任意位置泵浦光分布的影响。     

A queueing model of a production system with two machines,one operator and priorities

This paper studies a priority queueing model of a production system in which one operator serves two types of units with overlapping service times. The two types of units arrive in independent Poisson processes. There are two machines in the system. Units of type 1 receive two consecutive types of services at machine #1: the handwork performed by the operator and the automatic machining without the operator. Units of type 2 receive only the handwork performed by the operator at machine #2. The operator attends the two machines according to a strict-priority discipline which always gives units of type 2 higher priority than units of type 1. At each machine the handwork times have a general distribution, and at machine #1 the machining times have an exponential distribution. The Laplace-Stieltjes transform of the queue-size distributions and the waiting time distributions for a stationary process are obtained.     

UAT数据链上行报文时隙实时动态分配算法研究

基于UAT数据链上行TIS-B报文和FIS-B报文时如何合理的利用时间资源,制定地面上行数据的时隙策略,避免出现报文重叠和交织的问题,提出了时隙实时动态分配的算法。重点讨论了算法中时间段划分、配置报文发射窗口、窗口轮循变换和配置报文窗口偏移,对算法进行了结果的计算和实际工程中的应用分析,表明该方法完全满足实际工程中的应用要求,并提高了系统的实时性和动态性。     

Overlapping Schwarz waveform relaxation method for the solution of the convection–diffusion equation

In this article we study the convergence of the overlapping Schwarz wave form relaxation method for solving the convection–diffusion equation over multi-overlapped subdomains. It is shown that the method converges linearly and superlinearly over long and short time intervals, and the convergence depends on the size of the overlap. Numerical results are presented from solving specific types of model problems to demonstrate the convergence and the role of the size of the overlap. Copyright © 2007 John Wiley & Sons, Ltd.     

免疫-遗传算法用于混合物重叠核磁共振信号解析

通过对免疫系统中抗体对外来抗原的识别、消除等过程的模拟,建立了一种新型的免疫算法模型.将标样信号作为抗体,混合物重叠信号作为抗原输入免疫算法模型,通过迭代运算,从抗原中消除抗体所表示的信息,当抗原被抗体完全消除时,即实现了混合物重叠信号的解析.对多组分混合氨基酸NMR谱图的解析结果证明,该算法可方便地用于多组分重叠信号的解析,为利用数据库解析混合物或生物大分子等物质的复杂NMR谱图开辟了一条全新的途径.     

FMICW雷达海洋回波信号频率间断点和频率混叠的处理

根据Donald E.Barrick提出的线性调频中断连续波（FMICW）雷达信号处理方法,探测海洋表面回波距离、Doppler频移和角度信息。研究了当使用FMICW雷达实现天线的收发共用时,雷达接收和发送矩形脉冲串两项因素引起的频率混叠,以及周期线性调频连续波（FMCW）存在频率间断点对Doppler谱的影响。提出了采用FMICW雷达天线收发共用时,处理频率间断点和频率混叠的方法。利用浙江舟山实验数据进行处理,证明该方法可行。