一类带有Holling type-Ⅲ功能反应的捕食-食饵系统的定性分析

对一类带有Holling type-Ⅲ功能反应的捕食-食饵系统进行了研究,分析了解的有界性和保持性,讨论了平衡点的局部稳定性,并研究了Hopf分支的存在性.     

一类具Ⅲ类功能反应的非自治捕食系统的持久性

研究一类具Ⅲ类功能反应的非自治捕食系统在一定条件下,该系统一致持续生存且存在唯一全局稳定的周期解。     

[0,1]-拟阵模糊基的进一步研究

进一步研究保证[0,1]-拟阵模糊基具有存在性、等势性和交换性的条件,通过引入有界性、饱和性和强基好性的概念,给出有界性与闭性、饱和性与正则性、强基好性与基好性之间的关系.     

具有离散和分布时滞系统的鲁棒有限时间能量-峰值控制

研究了不确定线性时滞系统在有限时间能量-峰值性能指标约束下的鲁棒控制问题.系统的系数矩阵包含范数有界的不确定性,状态包含离散时滞和分布时滞.引入一个含参数的Lyapunov泛函,通过检验它的指数增长情况,为状态和输出定界,据此得到了闭环系统对于所有允许的不确定性有限时间有界以及满足预先指定的能量-峰值性能指标的充分条件,同时给出了状态反馈控制率.这些条件是有特征值约束的线性矩阵不等式,通过把特征值约束转换成非线性矩阵不等式,设计了锥补偿线性化(CCL)算法来求解这样的矩阵不等式,最后用数值算例验证了所得方法的有效性.     

The structure of uniform B-spline curves with parameters

The shape-adjustable curve constructed by uniform B-spline basis function with parameter is an extension of uniform B-spline curve. In this paper, we study the relation between the uniform B-spline basis functions with parameter and the B-spline basis functions. Based on the degree elevation of B-spline, we extend the uniform B-spline basis functions with parameter to ones with multiple parameters. Examples show that the proposed basis functions provide more flexibility for curve design.     

MANUFACTURER’S UNIFORM PRICING AND CHANNEL CHOICE WITH A RETAIL PRICE MARKUP COMMITMENT STRATEGY

The paper studies channel choice decisions in a multi-channel supply chain under a strategy where there is an ex-ante commitment made on the retail price markup. The market demand is uncertain and dependent on the price and sales efforts. The results show that in any channel structure, when making order decisions the retailer only examines the price ratio and the fluctuation size of random demand, rather than the channel cost and the retailer＇s marketing efficiency. When the retail price rises, the manufacturer is willing to increase inventory quantity for direct sales, because the manufacturer＇s profit margin is higher in direct channel. The increase in demand fluctuation only affects the degree of channel preference but doesn＇t change the manufacturer＇s channel choice. No matter in which level the price ratio is, when the sales efficiency of retail channel is not high or the demand proportion of direct channel is low, the manufacturer and the retailer will be both apt to choose a dual-channel structure. Then adding a direct channel becomes a marketing strategy, rather than a competitor of the retail channel, and helps the supply chain win more market demand.     

Kirchhoff方程解的指数衰减性质

研究了Kirchhoff方程解的指数衰减性,借助于非线性Kirchhoff方程和非线性波动方程解的性质,利用Galerkin方法证明了解的有界性,进一步通过构建适当的Lyapunov函数,证明特定条件下Kirchhoff方程解呈指数衰减.该理论的证明对完善Kirchhoff方程解的研究有积极的意义.     

一类非线性系统的鲁棒控制

本文针对不确定性仿射非线性系统，通过状态生分同胚变换和反馈控制建立了系统的带有不确定性的线性化模型，分别研究了调节问题跟踪问题的鲁棒外环设计方法，所提出的算法不但能保证系统的鲁棒性，而且使闭环系统有良好的动态性能，闭环系统的全局收敛性和终结有界性得到了证明。     

加权Orlicz空间上的有界算子与加权Bergman空间上的η－列

本文研究了单位圆盘加权Ｏｒｌｉｃｚ空间上的再生核公式和有界算子以及加权Ｂｅｒｇｍａｎ空间上的η－列、ＢＥ函数和ＧＬ函数的性质，从而建立起了比古典Ｂｅｒｇｍａｎ空间要广泛得多的一类空间上的良好结果     

一类高阶有理差分方程非负解的收敛性

针对高阶有理差分方程xn+1=α+(∑k+1i-1B2i-1xn-2i+l)/(A+xn-2l),n=0,1,…,其中k,l为非负整数,α是正数,A,Bi,i=1,2,…,k+1和初始条件是非负数,给出该方程的每个非负解都收敛于方程的一个二周期解的一个充分条件.