基于单调关联系统的驾驶行为可靠度计算方法

为合理评估驾驶员驾驶行为的可靠性,提出了驾驶行为可靠度计算方法,将人机系统可靠性理论与驾驶行为链相结合,构建了基于感知、判断、操作元件及模块组的驾驶行为可靠性框图,确定了单项器官元件可靠度测试与计算方法,运用单调关联系统理论给出了功能模块可靠度及驾驶行为系统可靠度的量化模型,计算了模型中各生理、心理元件概率重要度,分析了其对驾驶行为的影响度。计算结果表明:事故组与非事故组间行为可靠性存在明显差异,非事故组的可靠性整体大于事故组,但整体可靠性呈下降趋势,事故组驾驶员整体操作稳定性较差;生理因素对驾驶行为可靠度影响度前期较大后期较小,而心理因素则相反。     

具有Volterra型非线性边界条件的反应扩散方程的单调迭代法

研究了具有Ｖｏｌｔｅｒｒａ型非线性边界条件的反应扩散方程的边值问题，建立了解的存在性和唯一性的单调迭代法。     

瞬时预防维修的可修系统的维修更换策略

研究了具有预防维修的单部件一个修理工的可修系统的维修更换策略。假定预防维修能修复如新，而故障维修修复非新。引入单调过程，以系统的故障次数N为更换策略，以系统预防维修的时间间隔T为维修策略，选择最优的（N^＊，T^＊）使系统经长期运行后单位时间内的期望收益最大。     

Behavior of the cell transmission model and effectiveness of ramp metering

The paper characterizes the behavior of the cell transmission model of a freeway, divided into N sections or cells, each with one on-ramp and one off-ramp. The state of the dynamical system is the N-dimensional vector n of vehicle densities in the N sections. A feasible stationary demand pattern induces a unique equilibrium flow in each section. However, there is an infinite set—in fact a continuum—of equilibrium states, including a unique uncongested equilibrium n^u in which free flow speed prevails in all sections, and a unique most congested equilibrium n^con. In every other equilibrium n^e one or more sections are congested, and n^u  n^e  n^con. Every equilibrium is stable and every trajectory converges to some equilibrium state.Two implications for ramp metering are explored. First, if the demand exceeds capacity and the ramps are not metered, every trajectory converges to the most congested equilibrium. Moreover, there is a ramp metering strategy that increases discharge flows and reduces total travel time compared with the no-metering strategy. Second, even when the demand is feasible but the freeway is initially congested, there is a ramp metering strategy that moves the system to the uncongested equilibrium and reduces total travel time. The two conclusions show that congestion invariably indicates wastefulness of freeway resources that ramp metering can eliminate.     

一个判别函数一致连续性的新标准

借助于次可加的单调不减连续函数,给出了判别函数一致连续性的一个新的标准。     

二阶脉冲泛函微分方程周期边值问题的单调迭代方法

运用上下解及单调迭代技巧讨论了较为广泛的一类二阶脉冲泛函微分方程周期边值问题极解的存在性.     

Finite-Time Stability of Nonautonomous Delayed Systems

The finite-time stability to linear discontinuous time-varying delayed system was investigated. By applying the method of upper and lower solutions, some sufficient conditions of this kind of stability were obtained. Furthermore, it also developed a monotone iterative technique for obtaining solutions which are obtained as limits of monotone sequences