分段线性微分包含系统的最优控制设计

针对分段线性微分包含系统,根据Hamilton-Jacobi-Bellman(H-J-B)不等式将最优控制设计问题转化成最优控制性能上界的优化问题及性能下界的求取问题.其中性能上界的优化是一组以反馈增益为寻优参数的双线性矩阵不等式(bilinear matrix inequalities,BMI)问题,而性能下界是一组基于线性矩阵不等式(linear matrixinequalities,LMI)的半正定规划问题.结合遗传算法和内点法设计了一种混合算法对BMI问题进行求解.算例表明方法的有效性.     

农户自主发展能力差异比较研究

通过对河南省5个类型农区580家农户的调查,从农户自身素能、主动获取信息与处理能力、农户决策能力等12个层面设计出93项指标,构建了农户自主发展能力模型.研究表明:①农户自主发展能力主要体现于农户经济发展与信息处理能力、环境利用与生存能力、农户自身发展能力,表达程度为87.04%;②在农户经济发展与信息处理能力方面.近邻城市郊区的墙南村最强,位居豫东平原的北宋村最弱;在环境利用与生存能力方面,位居行政边缘交界地带的陈湾村较高;在农户自身发展能力方面,北宋村易于安乐可能偏高,而位居山区的上河村则偏低;③不同的区域经济背景会影响农户经济自主发展能力,地级市影响微弱,县区具有一定影响,乡镇经济影响显著;④地形对农户自主发展能力的影响并不显著;⑤距离城市远近与农户自主发展能力具有较强负相关关系.图1,表3,参9.     

Improved delay-dependent stability criteria for systems with interval delay

This paper deals with the problem of stability for systems with delay varying in an interval.A new Lyapunov functional,which makes use of the information of both the lower and upper bounds of the interval time-varying delay,is proposed to derive some new stability criteria.Furthermore,the relationship of the time-varying delay and its lower bound and upper bound is taken into account.As a result,some less conservative delay-dependent stability criteria are obtained without ignoring any useful information in the derivative of Lyapunov functional,which are established in the forms of linear matrix inequalities.Numerical examples are provided to show that the obtained results are better than existing ones.     

Nonlinear differential geometric guidance for maneuvering target

Based on the idea of zeroing the line of sight rate(LOSR),a novel nonlinear differential geometric(DG) law for intercepting the agile target is proposed.In the first part,the DG formulations are utilized to describe the relatively kinematics model of missile and target,and the nonlinear DG guidance(DGG) law is proposed based on the nonlinear control theory to eliminate the influence brought by target.Further,the missile guidance commands are derived to overcome the information loss caused by decoupling condition,the new necessary initial condition is developed to guarantee capture the agile target.Then,the designed nonlinear DGG commands are transformed from an arc-length system to the time domain.A desirable aspect of the designed guidance law is that it does not require rigorous information about target acceleration.Representative numerical results show that the designed guidance law obtain a better performance than the traditional DGG law for agile target.     

STABILITY CRITERIA FOR A CLASS OF UNCERTAINSYSTEMS WITH TIME—DELAY

Some stability criteria are obtained for a class of uncertain systems with time-delay usingLyapunov functional and analytic techniques. It is easy to check the criteria by making use of theboundedness of the uncertainties.     

Some synchronization criteria for general complex networks with coupling delays

A general complex delayed dynamical network model with asymmetric coupling matrix is considered in this paper. For reducing the conservativeness of synchronization criteria, several novel synchronization stability conditions are presented by using delay decomposition methods. Numerical examples which are widely used to study delay-dependent synchronization stability are given to illustrate the effectiveness of the proposed methods.     

离散动态系统稳定与不稳定的简捷判据

运用矩阵特征值分析技巧研究了区间矩阵及一类离散动态系统的稳定性问题。在无需任何附加条件的情况下,仅用区间矩阵的界阵元素给出了一般区间矩阵及离散动态系统混合稳定、渐进(离散)稳定与不稳定的简便代数判据(含充分条件、必要条件与充要条件),弃掉了对区间矩阵的下(上)界阵为非负(正)的条件要求。相对于现存结果,提出判据不仅明显具有普适性强实用范围广且保守性小的特性,而且还涵盖了一些原有的稳定性判据。     

基于概率语言熵和交叉熵的多准则决策方法

概率语言术语集既包含语言术语,又包含语言信息的概率,使初始决策信息能够得到充分的利用,有利于提高语言术语集多准则决策的科学性.鉴于此,本文针对概率语言多准则决策问题,提出了一种基于概率语言熵和概率语言交叉熵赋权的多准则决策方法.首先考虑各准则下概率语言术语集的个体效应及其相互作用,利用概率语言熵和概率语言交叉熵计算准则的权重,然后采用将有向图和0-1优先关系矩阵相结合的概率语言术语集备选方案排序方法,更加直观地得到备选方案的排序结果并得到各方案之间的优劣程度.最后,以企业战略规划问题为例进行分析,通过对比分析验证了所提方法的有效性和优越性.     

A DEA-TOPSIS method for multiple criteria decision analysis in emergency management

A hybrid approach of DEA (data envelopment analysis) and TOPSIS (technique for order performance (preference) by similarity to ideal solution) is proposed for multiple criteria decision analysis in emergency management. Two DEA-based optimization models are constructed to facilitate identifying parameter information regarding criterion weights and quantifying qualitative criteria in TOPSIS. An emergency management case study utilizing data from the Emergency Management Australia (EMA) Disasters Database is provided to demonstrate the feasibility of the proposed analysis procedure.     

Total reward criteria for unconstrained/constrained continuous-time Markov decision processes

This paper studies denumerable continuous-time Markov decision processes with expected total reward criteria. The authors first study the unconstrained model with possible unbounded transition rates, and give suitable conditions on the controlled system’s primitive data under which the authors show the existence of a solution to the total reward optimality equation and also the existence of an optimal stationary policy. Then, the authors impose a constraint on an expected total cost, and consider the associated constrained model. Basing on the results about the unconstrained model and using the Lagrange multipliers approach, the authors prove the existence of constrained-optimal policies under some additional conditions. Finally, the authors apply the results to controlled queueing systems.     

Improved stability criteria for uncertain linear systems with interval time-varying delay

This paper deals with the robust stability analysis of dynamic systems with interval timevarying delay and uncertainties. The innovation of the method includes employment of a tighter integral inequality and construction of an appropriate type of Lyapunov functional. The stability criteria derived from this method have less conservatism than some existing ones. Numerical examples are given to illustrate the effectiveness of the proposed method.     

双倍体差分进化粒子群算法在VRPSDP中的应用研究

针对粒子群算法和差分进化算法的不足,根据生物遗传学规律,提出了双倍体差分进化粒子群算法,并将其用于具有集送货需求车辆路径问题的求解中.个体有显性隐性两种状态,显性状态执行粒子群优化规则,隐性状态执行差分进化规则,通过比较适应度显性隐性可以互换.根据算法和问题特点,提出了一种实数编解码方案,使用启发式算法修正和改进算法结果.通过仿真实验,分析讨论了算法的参数,并与其他算法进行了比较,表明该算法是求解具有集送货需求车辆路径问题的有效方法.     

Two effective stability criteria for linear time-delay systems with complex coefficients

This paper presents a method for directly analyzing the stability of complex-DDEs on the basis of stability switches. Two novel criteria are developed for the stability of a class of complex-DDEs. These results not only generalize some known results in literature but also greatly reduce the complexity of analysis and computation. To validate the effectiveness of the proposed criteria, the stabilization problem of the extended time delay auto-synchronization (ETDAS) control and n time delay auto-synchronization (NTDAS) control are then further investigated, respectively. The numerical simulations are consistent with the above theoretical analysis.     

基于生存理论的股票系统演化及调控

利用复杂系统的生存理论及经济学中的“瓦尔拉斯（Ｗａｌｒａｓ）均衡”思想构造了股票系统演化的不确定性模型，提出了股市演化过程中国家对股市的宏观调控模型，论述了股票系统的自我稳定功能，分析了我国股市扩容存在的问题及其对策，具有一定的现实指导意义。     

两类不确定奇异时滞系统鲁棒稳定的相关型判据

研究了不确定奇异时滞系统的鲁棒稳定性问题。首先以线性矩阵不等式的形式给出了奇异时滞系统正则,无脉冲模且零解渐近稳定的一种新的时滞相关型判据。通过引入新的参数避免了利用不等式处理交叉项,从而使该判据具有较小的保守性。最后,利用研究结果,给出了两类不确定奇异时滞系统新的时滞相关型鲁棒稳定性判据。     

属性值为区间数的决策对象预期理论模型研究

针对属性值为区间数的多属性决策中不同区间数相互比较具有相同可能度的问题进行研究。根据决策者不同的风险偏好将其分为3类,对不同风险偏好类型的决策者提出相应的预期理论模型,确定区间数之间的优势关系。在此基础之上,提出决策对象优势关系及优势度矩阵,并根据优势度数值对决策对象进行排序择优。最后,通过实例验证新排序算法的科学性与有效性。     

A hierarchical multiple criteria model for eliciting relative preferences in conflict situations

A multiple criteria decision analysis(MCDA) approach is designed for capturing the relative preference information of a decision maker involved in a conflict.More specifically,an MCDA approach based on the outranking method,ELECTRE III,is employed for ranking states or possible scenarios in the conflict from most to least preferred,where ties are allowed,for a decision maker according to his or her value system.To demonstrate how this preference elicitation methodology can be conveniently implemented in practice within the framework of the Graph Model for Conflict Resolution,it is applied to a real world water supply crisis which occurred in the town of North Battleford,located in the Canadian province of Saskatchewan.     

Novel time-frequency differential space-time modulation for multi-antenna OFDM systems

1.INTRODUCTIONRecently,there has been considerable interest in thewireless communication system with multiple trans-mit and receive antennas[1,2].So far,most researchon space-ti me modulation has assumed that accuratechannel esti mations are available at the receivers.Differential space-ti me(DST)modulationschemes were proposed to achieve diversity gainswithout channel state information(CSI)[3].DSTmodulation schemes allowfor slowly changing chan-nels that have to remaininvariant within…     

改进差分进化算法求解武器目标分配问题

针对武器目标分配问题求解收敛速度慢、搜索效率低、寻优精度差的问题,提出一种基于改进差分进化算法的武器目标分配方法.首先,建立多约束条件下武器目标分配优化模型,将动态武器目标分配问题离散为静态武器目标分配问题处理.其次,采用随机邻域变异策略平衡差分进化算法全局探索和局部开发能力,采用基于历史存档的自适应参数整定方法,根据...     

A maximum principle for general backward stochastic differential equation

In this paper, the authors consider a stochastic control problem where the system is governed by a general backward stochastic differential equation. The control domain need not be convex, and the diffusion coefficient can contain a control variable. The authors obtain a stochastic maximum principle for the optimal control of this problem by virtue of the second-order duality method.