Mental flexibility impairment in drivers with early Alzheimer's disease: A simulator-based study

After memory impairment, one of the most common troubles of early Alzheimer's disease (AD) is the impairment of executive functioning. However, it can have major consequences on daily life, notably on the driving activity. The present study focused on one important executive function involved in driving: mental flexibility; and considered how this impairment can affect driving. Ten patients with early AD were matched with 29 healthy older drivers. All participants were given an evaluation of mental flexibility through neuropsychological tests and an experimental test developed on a static driving simulator. The experiment was divided in two conditions; one without mental flexibility and another condition with a mental flexibility demand. AD patients showed impairments in the neuropsychological tests evaluating mental flexibility. These deficits are linked to the deficits they showed in the driving simulator flexibility tests. This study contributes to the understanding of mental flexibility mechanisms and on their role in driving activity. It also confirms that the driving simulator is a suitable tool to explore cognitive disorders and driving ability.     

Application of H∞ control in rudder/flap vector robust control of a ship''s course

Given the uncertainty of parameters and the random nature of disturbances that effect a ships course, a robust course controller should be designed on the basis of rudder/flap vector control. This paper analyzes system uncertainty, and the choice of weighting functions is also discussed. When sea waves operate on a ship, the energy-concentrating frequency varies with the angle of encounter. For different angles of encounter, different weighting functions are designed. For the pole of a nominal model existing in an imaginary axis, the bilinear-transform method is used. The "2-Riccati" equation is adopted to solve the H∞ controller. A system simulation is given, and the results show that, compared with a PID controller, this system has higher course precision and more robust performance. This research has significant engineering value.     

Application of H~∞ control in rudder/flap vector robust control of a ship's course

Given the uncertainty of parameters and the random nature of disturbances that effect a ships course, a robust course controller should be designed on the basis of rudder/flap vector control. This paper analyzes system uncertainty, and the choice of weighting functions is also discussed. When sea waves operate on a ship, the energy-concentrating frequency varies with the angle of encounter. For different angles of encounter, different weighting functions are designed. For the pole of a nominal model existing in an imaginary axis, the bilinear-transform method is used. The "2-Riccati" equation is adopted to solve the H∞ controller. A system simulation is given, and the results show that, compared with a PID controller, this system has higher course precision and more robust performance. This research has significant engineering value.     

一类奇异积分算子与无界连续函数逼近

利用扩展乘数法建立了MnpakbяH算子逼近全实轴上任意无界连续函数的收敛性定理，给出了具有一般性的结论，从而推广了前人的若干重要定理。     

锰粉加工工人心血管功能的调查研究

对 ５５ 名锰粉加工工人和 ５６ 名对照工人的调查结果显示，工人工作地点 Ｍｎ Ｏ２ 浓度几何均值为 １９６ ｍ ｇ／ｍ ３ （锰尘 ０１７～２２．２４ ｍ ｇ／ｍ ３ ），样品超标率 ８８７％ 。接触组头晕头痛、睡眠障碍、容易疲劳和记忆不良的主诉率明显高于对照组（ Ｐ＜００５～００１）。接触组和对照组的心电图异常、高血压和低舒张压检出率未见显著性差异，其心率、 Ｐ Ｒ间期、 Ｑ Ｒ Ｓ波、收缩压和舒张压的均值比较也没有显著性差异。接触组心电图异常和低舒张压的 Ｏ Ｒ分别是 １．５６（９５％ 可信区间为 ０７０～３．５０）和 ２．０８（９５％ 可信区间为 ０１８～２３．５７）。     

基于FIR与正交基分解的磁性目标检测方法

针对磁异常探测中,磁性目标信号被噪声淹没,信噪比较低的情况,提出了FIR与正交基分解相结合的检测方法。先利用FIR低通滤波器滤除高频噪声,保留磁性目标磁异常信号,再利用正交基分解检测算法,大幅度提升磁性目标信号的信噪比,从而实现磁性目标检测。仿真试验结果表明,该方法可以提升磁性目标检测能力,具有一定的工程应用价值。     

基于城市交通规划编制体系提高交通规划效率

梳理了城市交通规划编制体系与城市规划的关系,分析了不同类型城市交通规划编制体系差异的主要影响因素体现在城市空间结构的复杂性、交通系统构成、人口结构差异和区域经济社会发展的不同角色4个方面.对各类城市交通规划编制体系进行比较,同时比较不同规模类型城市的交通规划编制管理部门的职能分工.以上海为例,讨论和分析了城市不同发展阶段与城市交通密切相关的三大职能单位组织编制和协调各项交通规划的变迁历程,从规划编制体系的角度总结提高城市交通规划效率的经验.     

基于模糊评价的水面舰艇综合性能评估

模糊综合评价法对复杂系统进行评价比其他评价方法更具有优越性,介绍模糊评价的基本原理及其数学模型,给出复杂系统的模糊矩阵的表示方法及推理过程。结合水面舰艇综合作战性能特点进行分析,给出水面舰艇综合性能评价的一般方法,对新型水面舰艇的综合性能的评价有一定的指导意义。     

一种基于DNA计算的多模态函数求解模型

通过对DNA计算的研究,提出了一种在DNA计算的基础上引入一种基于Lokta-Volterra方程的生态竞争繁殖、家庭选择机制等的求解多模态函数的进化算法,使得群体能够保持多样性,并有效地避免了早熟收敛,通过对测试函数的求解,同时搜索到多模函数多个极值峰点,取得了令人满意的结果。     

B—凸规划及其最优性条件

通过给出Ｂ－凸规划的定义并研究它的基本性质，得到Ｂ－凸规划的最优性条件。