移动电信低端增量市场中的价格策略互动

针对双头垄断下的移动市场竞争,在用户存在转网成本,且运营商根据用户支付意愿和网络偏好价格歧视策略条件下,采用一个三阶段动态博奕模型对运营商低端增量市场竞争中的价格策略互动进行了分析,认为前期高端市场中的不对称地位会激励不同运营商在价格竞争采取不同策略,在位运营商为了保持与原有用户的激励相容会相对保守.均衡时低端增量市场份额分布与运营商前期高端市场优势无关,而取决于其提供的用户效用水平.     

OPTIMAL SWITCHING AND IMPULSE CONTROLS FOR DISTRIBUTED PARAMETER SYSTEMS

Optimal switching and impulse controls for a distributed parameter systems are considered.We prove that the value functions u_u(·) of approximating problems approach to the value functionu(·) of the original problem,while u_u(·) is the unique viscosity solution of the correspondingHamilton-Jacobi-Bellman system.We also construct an optimal control for the original problem viathe value function u(·).     

马尔可夫理论在工作面产量模拟中的应用

利用马尔可夫理论,构造了两个机采工作面产量的模拟模型。介绍了用赋值马尔可夫理论构造懊型的基本原理和方法,并用实例说明了模型的应用。     

晶闸管相控变频器的频率比极限

通过分析晶闸管相控变频器输出电压谐波的方法，导出不同频率比时输出电压中低频分量和零频分量的定量数据，并说明如何应用这些数据，根据对输出电压质量的要求来确定频率比的极限值。     

晶体管脉宽调制放大器非线性特性的研究

本文采用理论分析和实验研究的方法,确定脉宽调制放大器的非线性特性,并提出了计算非线性特性参数的方法,为研究晶体管直流脉宽调速系统的自激振荡,强制振荡和分谐波振荡过程提供根据。     

H∞ control for uncertain Markovian jump systems with mode-dependent mixed delays

We study the problem of H∞ control for a class of Markovian jump systems with norm-bounded parameter uncertainties and mode-dependent mixed delays including discrete delays and distributed delays in this paper. Our aim is to present a new delay-dependent control approach such that the resulting closed-loop system is robust mean-square （MS） exponentially stable and satisfies a prescribed H∞ performance level, irrespective of the parameter uncertainties. Such delay-dependent approach does not require system transformation or free-weighting matrix. A numerical example shows that the results are less conservative and more effective.     

中立型混合随机偏微分方程的数值分析

大多数随机偏微分方程解析解不可能表达出来.近年来,对随机偏微分方程数值格式的研究越来越多.该文主要考虑中立型混合随机偏微分方程数值解的收敛率.首先使用Galerkin方法给出空间上离散化,然后使用随机指数积分器给出时间上离散化,利用半群性质及随机分析工具得到这类方程数值解的收敛率.推广了有限维随机方程的相关结果.     

Differentiated multi-layer integrated routing algorithms in optical internet

We investigate the problem of efficiently provisioning connections of arbitrary bandwidth granularities in integrated optical Internet model, and propose a novel dynamic weighted fair routing algorithm (DWFA) that employs QoS-aware flexible adaptive unified routing strategies according to the priority and granularity of the traffic connection request. Performance simulation results of DWFA show that our adaptive approach performs better in terms of traffic blocking ratio, traffic blocking fairness and traffic average logical hop counts than traditional overlay sequential routing scheme such as optical-layer-first routing (OFR) and electrical-layer-first routing (EFR). DWFA is very suitable for solving QoS-based multi-layer integrated routing (MLIR) problem in the next generation multi-granularity integrated optical Internet.     

Markov随机环境过程驱动的风险过程

本文讨论由Markov环境过程驱动的风险过程,给出了期望贴现惩罚函数的Laplace变换的表达式,利用一般Lundberg基本方程,得到了期望贴现惩罚函数的简洁表达式,并推得了给定初始环境状态,初始资金为0时破产前瞬间盈余、破产赤字的贴现联合密度及其边缘密度。同时,本文也给出了破产时间、破产前瞬间盈余以及破产时赤字的矩的计算方法。