研究M/G/1排队的一个新的向量马氏过程

In this paper, by considering the stochastic process of the busy period and the idle period, and introducing the unfinished work as a supplementary variable, a new vector Markov process was presented to study the M/G/1 queue again. Through establishing and solving the density evolution equations, the busy-period distribution, and the stationary distributionof waiting time and queue length were obtained. In addition, the stability condition of this queue system was given by means of an imbedded renewal process.     

Character of HBV （hepatitis B virus） polymerase gene rtM204V／I and rtL180M mutation in patients with lamivudine resistance

Objectives: To investigate the relationship between HBV (hepatitis B virus) polymerase gene 180 and 204 sites mutation and lamivudine resistance. Methods: One hundred forty-one patients with lamivudine resistance after lamivudine treatment and 60 chronic hepatitis B patients without lamivudine treatment were enrolled in this study. The serum HBV DNA mutation was analyzed by sequence detection via polymerase chain reaction (PCR). The sequences of the same patient were analyzed before and after lamivudine treatment. Results: One hundred and nine lamivudine resistance patients had HBV YMDD (tyrosine-methionine-aspartate-aspartate) mutation. Among them, 45 patients had rtL180M/M204V mutation (41.28%), 28 patients had rtL 180M/M204I mutation (25.70%) and 36 patients had rtM204I mutation (33.02%). There were 6 patients with rtL180M mutation in 32 lamivudine resistance patients. Sixty chronic hepatitis patients without lamivudine treatment had no mutations. Conclusions: HBV mutations, which play an important role in lamivudine resistance usually locate at polymerase gene 204 site; 180 site mutation was also observed in these patients. Evaluation of the anti-virus therapy by surveillance of the two sites mutations is of importance.     

M/M/1/C排队论系统非稳态解分析

在计算机通信等资源共事系统中，常遇到M/M/1／C排队问题，通常实际问题都是讨论问题的稳态解。本文分析了M/M/1／C排队系统的非稳态解的渐近行为，对分析M/M/1／C排队系统的渐近行为有重要参考价值。     

M／P的Schottky结光伏吸收模型研究

报告了M／P的Schottky结光伏吸收特性,给出对应介导的原子团蔟新模型,较好地解释了实验结果。     

C51与PL／M—51软件接口的实现

介绍单片机开发工具C51与PL／M—51软件接口的实现方法，说明PL／M—51扩展库的建立过程并给出具体的接口实例。     

Study on the Stabilizing Conditions of W／O Microemulsion

The stabilizing conditions of W/O microemulsion of Tx-6-C4H9OH/c-C6h12/H2O system were studied by visual observation.The result shows that when the weight ratio of Tx-6 to C4H9OH is 4:1 ,the W/O microemulsion system has stabilizing and extensive regions,and the system is insensitive to the values of pH and in the range of room temperature.In accordance with the theoretical value of HLB,the suitable value of HLB for Tx-6 and C4H9OH to compose microemulsion is greater than 9,less than or equal to 10 value of HLB.the suitable value of HLB for Tx-6 and C4H9OH to compose microemulsion is greater than 9,less than or equal to 10.     

"M1的M2倍"格式的认知分析

数量关系"M1的M2倍"这种格式,其中"M"表示数词,例如"三的五倍"十一的十一倍"等这类结构,使用"的"字结构的偏正结构去描写,但与其相关或者相对的别的数量关系,却有的可以用这种偏正结构去描写,有的不可以用.文章通过对"M1的M2倍"这种格式的形式分析,并运用隐喻、整合度的认知语言学概念,去探求这种偏正结构表达式的特殊性,同时也尝试探求这种数量关系用偏正结构表达背后所隐藏的认知机制.     

逆M矩阵的几个行列式不等式

本文讨论了逆M矩阵的Hadamard—Fischer不等式,并给出了行列式det(A D)的估计式,其中A为逆M矩阵,D为非负对角阵。     

关闭期和启动期的M/G/1排队模型的改进

研究关闭期和启动期M／G／1排队模型的改进，导出了稳态队长的分布和母函数．等待时间的分布和其LST及其随机分解结果和稳态系统忙期。     

M/M/1型随机服务系统的模拟仿真研究

文章首先介绍了M/M/1型随机服务系统系统的基本原理,然后运用仿真工具Matlab和Opnet对该类型系统分别进行了仿真实验,两者结果较吻合。     

Study on US／O3 mechanism in p-chlorophenol decomposition

INTRODUCTION Due to its high oxidability, high reaction rate and absence of any secondary pollution, ozonolysis tech-nique has increasingly been used in the sanitization of drinking water, treatment of industrial wastewater and especially in the treatment of pollutants which are difficult to get rid of in biological oxidation processes. Its low dispersion rate and high cost, however, im-pede it from wider applications. In recent years, in order to improve the utilization rate of ozone, se…     

逆M矩阵的性质及其判断

利用逆M矩阵的定义和理论,给出逆M矩阵的三个相似的结构性质,得到了与逆M矩阵相关的复数域上n阶矩阵为正的必要条件,同时证明了任-n阶矩阵与逆矩阵之和仍是逆矩阵的结论.     

港湾网络以应用、用户需求为根本——NetHammer M582／M562交换路由一体化解决方案

任何一项科学技术的发展都是依托在应用的平台上，只有广泛的应用才能推动一项技术的长足发展，互联网技术的发展就是一个最好的证明。在科学界也有一种形象的说法：应用为王。在前些年，由于硬件技术的局限使网络处在一个低带宽、低性能的基础之上，很多的应用是无法实现的。人们关注的重点逐渐从应用业务转向了高带宽、高性能。随着硬件技术的突飞猛     

一类输入率可变的M/M/1排队系统研究

讨论了顾客以αk=k＋11＋k=k＋1-k的概率进入系统接受服务的M/M/1可变输入率的排队模型,证明其平稳分布存在,并计算得到了平均等待队长,系统的平均队长,系统的损失概率,顾客进入系统并接受服务的概率等一系列指标.     

双重4M法教学-学好AutoCAD

双重4M法教学,通过教师教学主体与学生学习主体互动实现。双重2M法-演绎师生教与学前奏;双重2M法-演绎师生互动课堂。     

M理论及其本体诠释

M理论是当代基础物理学的前沿阵地。本文在于探索 M理论的本体诠释。为讨论方便 ,引言中给出了微扰超弦理论简况 ,其次概述了 M理论的重要概念 ,最后分四个方面探讨了 M理论的本体诠释问题。     

具有可变输入率的M/M/n排队模型

讨论了到达顾客以概率αk=1k＋1（k∈N）进入M/M/n排队系统的可变输入率模型,获得了该模型的主要指标（比如平稳分布,系统的平均等待队长,系统平均忙期的服务窗个数,系统的平均队长,系统损失的概率等等）,由little公式得到顾客的平均逗留时间和平均等待时间。并进行了实证分析。     

输入率呈指数变化的M/M/1排队模型

文章主要讨论了新到达的顾客以概率α=a^k（0〈a〈1）进入系统接受服务的M/M/1排队模型,得到了这种模型的平稳分布和主要目标参量,从而推广了文献[1]中的结果,并为实际应用提供了一定的理论依据。     

浅谈M1卡的结构及其应用

M1卡作为射频卡的一种,由于具有"一卡多用"的突出特点,而成为一卡通系统的首选卡型.本文共分三部分,分别介绍了射频卡的种类、M1卡的结构、M1卡在一卡通系统中的使用.在分析M1卡结构的基础上讨论了如何在M1卡上实现"一卡通".     

Predictive performance of ‘Diprifusor＇ TCI system in patients during upper abdominal surgery under propofol／fentanyl anesthesia

Objective: To evaluate the predictive performance of ‘Diprifusor‘ TCI (target-controlled infusion) system for its better application in clinical anesthesia. Methods: The predictive performance of a ‘Diprifusor‘ TCI system was investigated in 27 Chinese patients (16 males and 11 females) during upper abdominal surgery under total intravenous anesthesia (TIVA) with propofol/fentanyl. Measured arterial propofol concentrations were compared with the values predicted by the TCI infusion system.Performance was determined by the median performance error (MDPE), the median absolute performance error (MDAPE), the divergence (the percentage change of the absolute PE with time), and the wobble (the median absolute deviation of each PE from the MDPE). Results: The median (range) values of 14.9% (-21.6%～42.9%) for MDPE, 23.3% (6.9%～62.5%) for MDAPE, -1.9% h^-1(-32.7%～23.0% h^-1) for divergence, and 18.9% (4.2%～59.6%) for wobble were obtained from 227 samples from all patients.For the studied population, the PE did not increase with time but with increasing target propofol concentration, particularly following induction. Conclusions: The control of depth of anaesthesia was good in all patients undergoing upper abdominal surgical operation and the predictive performance of the ‘Diprifusor‘ target controlled infusion system was considered acceptable for clinical purposes. But the relatively bigger wobble showed that the pharmacokinetic model is not so suitable and requires improvement.