Strategic measures in optimal control problems for stochastic sequences

Controlled discrete–time stochastic processes axe studied using the convex–analytic approach. Some new properties of strategic measures spaces are established, particular Markov models are considered. The meaningful example is presented.     

基于改进SIR模型的知识密集型企业隐性知识转移研究

通过对比分析传染病传染机制与隐性知识的转移过程,引入SIR模型,根据隐性知识转移的特点对SIR模型进行改进,并在组织遗忘视角下,将员工知识遗忘细分为主动遗忘和被动遗忘,建立知识密集型企业隐性知识转移模型.而后,通过Matlab对该模型的演化函数进行模拟,分析知识接收方占比、知识转移能力、知识遗忘率及核心员工流失率对知识...     

小型化同轴SIR在广义切比雪夫滤波器中的应用

根据阶跃阻抗谐振器(SIR)的基本原理,采用λg/4型SIR作为单位元件谐振器,组成交叉耦合多级同轴带通滤波器.在结构中引入以零相位方式接入的抽头,并通过HFSS仿真进行了优化.实验结果表明,其尺寸比例比常用的梳状线滤波器形式显著减小,很好地实现了滤波器的小型化设计.     

An interpretation of COVID-19 in Tokyo using a combination of SIR models

A year and a half has passed since the outbreak of the COVID-19 pandemic. Mathematical models to predict infection are expected and many studies have been conducted. In this study, a new interpretation was created that could reproduce the daily positive cases in Tokyo using only a simple SIR model. In addition, the data on the ratio of transfer to delta variants could also be simulated. It is anticipated that this interpretation will be a basis for the development of forecasting methods.     

Globalexponential stability of an epidemic model with saturated and periodic incidence rate

This paper is concerned with a SIR model with saturated and periodic incidence rate and saturated treatment function. By using differential inequality technique, we employ a novel argument to show that the disease‐free equilibrium is globally exponentially stable. The obtained results improve and supplement existing ones. We also use numerical simulations to demonstrate our theoretical results. Copyright © 2015 John Wiley & Sons, Ltd.     

Effects of superspreaders in spread of epidemic

Within the standard SIR model with spatial structure, we propose two models for the superspreader. In one model, superspreaders have intrinsically strong infectiousness. In other model, they have many social connections. By Monte Carlo simulation, we obtain the percolation probability, the propagation speed, the epidemic curve, the distribution of secondary infected and the propagation path as functions of population and the density of superspreaders. By comparing the results with the data of SARS in Singapore 2003, we conclude that the latter model can explain the observation.     

一种小型的交叉耦合阶梯阻抗谐振器带通滤波器

利用小型化的阶梯阻抗谐振器设计了一种交叉耦合带通滤波器.引入的交叉耦合结构在带外产生了一对传输零点以更好地抑制带外干扰信号而不影响通带特性.由于采用了小型化的阶梯阻抗谐振器,交叉耦合带通滤波器尺寸大为减小,同时寄生通带移向更高端.实验和仿真结果基本一致.     

A second-sound based, hyperbolic SIR model for high-diffusivity spread

We present an analytical study of one-dimensional (1D) kinematic wave phenomena under a hyperbolic SIR model based not on Fick's diffusion law, but rather on the inertial-type II flux law of second-sound theory. Unlike in the Ficken context, we are able to derive exact traveling wave solutions (TWS)s, as well as explicit asymptotic/approximate expressions, for both the susceptibles and infectives. We also determine, using singular surface theory, how shock-fronts resulting from initial jump discontinuities propagate and evolve under this model. In particular, critical values and special cases are examined and possible mitigation methods, which take the form of parameter-value manipulation(s), are noted.     

一种基于SIR的DCA方法在无线数据网络中的应用

研究了无线数据网络中的信道分配策略，提出了基于信干比（Signal to Interference Ratio，SIR）的动态信道分配（Dynamic Channel Assignment，DCA），通过判断用户的SIR情况来分配空闲信道，并且建立了无线数据网络的排队论模型。仿真分析了网络的呼叫延迟概率和呼叫延迟超时概率这两个重要的性能指标，结果显示在系统高负载情况下，本文提出的基于SIR的DCA相对于传统的信道分配方法能够获得更好的效果，从而实现了对高负载网络的优化。     

Pooled marginal slicing approach via SIR<Subscript><Emphasis Type="Italic">α</Emphasis></Subscript> with discrete covariables

In this paper, we consider a semiparametric regression model involving both p-dimensional quantitative covariable X and categorical predictor Z, and including a dimension reduction of X via K indices X′β _k . The dependent variable Y can be real or q-dimensional. We propose an approach based on SIR _α and pooled marginal slicing methods in order to estimate the space spanned by the β _k ’s. We establish -consistency of the proposed estimator. Simulation studies show the numerical qualities of our estimator.