Similarity of the velocity profile in geometrically distorted flow model

A method is presented to measure the depth-averaged horizontal velocity in distorted physical models, i.e., the depth-averaged horizontal velocity can be equivalent to a point velocity measured at approximately 0.6h below the water surface (h is the water depth). Further a scale for the Chézy coefficient in distorted models is deduced, and the velocity distributions in the vertical in prototype and distorted models are analyzed. By comparing data of the vertical variation of the horizontal velocity measured in a physical distorted model (with distortion ratio of 4.0) with prototype data, inaccuracies via the one-point method, the three-point method and the five-point method are analyzed. It is concluded that it is more accurate to measure the depth-averaged velocity via the three-point method than via the one-point method in the distorted model. What's more, the point velocity at 0.6h below the water surface approximates the depth-averaged velocity in the distorted physical model and the one-point method is proposed to be used in practice.     

股价服从跳-扩过程证券组合的随机微分对策

在服价服从跳—扩过程时，同时考虑流通性这一因素水平，研究两人零和随机微分对策问题，在采用对数效用时分别获得了投资者的最优投资策略。     

大学生公寓的研究与认识

本文通过对现有不同类型的大学生公寓的实地考察．访问与分析？从现实生活中提出问题？并结合理论学习？对比国外学生公寓研究与分析？提出设计．建设我国大学生公寓的一些主张和建议.     

推移质动床模型变率的选择与比降变态的研究

根据模型沙起动相似和水流阻力相似要求,推导出推移质动床模型变率应满足的条件,当模型实际采用的变率不能满足要求时,或因选沙不当不能满足水流阻力相似条件时,可采用比降变态方法调整模型水流,在推导出调整后的比降比尺计算式的基础上,分比降变陡和变缓两种情形进行了说明。     

时间效用在门诊排队管理中的应用

将基于时间效用的优先级排队策略应用于医院门诊排队管理.目的是在保证候诊队列整体满意度不降低的前提下,最大程度地降低高优先级患者的等候时间.在建立排队模型时,引入时间效用来描述患者的等待满意度,在此基础上建立了基于候诊队列长度的效用函数.然后通过MOS(Mean Opinion Score)法调查患者满意度确定了此时间效用函数的参数,计算出不同候诊队列长度条件下高优先级患者的最大插队位数.仿真实验结果表明,本策略不降低顾客整体满意度,受人群比例影响较小,保证顾客在高峰时段等待时间平稳.     

一种解释学习系统的模型EBL／GA

解释学习是演绎式学习方法，而遗传算法是归纳式学习方法。本文提出的解释学习系统模型ＥＢＬ／ＧＡ，结合两者的优点提高了系统的效用。     

数字全息多平面成像技术研究

提出了一种新的数字全息多平面成像技术:将非共轭二次扭曲位相因子作用于实验记录的数字全息图,只需一次菲涅尔衍射便可同时对多个成像平面进行重建。首先介绍了非共轭二次扭曲位相因子多平面成像原理,然后开展实验验证了方法有效性。此方法只需记录一幅处于多个不同平面物体的数字全息图,依据该理论选择合适参数,可在任意位置重建多个平面再现像。采用均方根误差(RMSE)与峰值信噪比(PSNR)作为图像质量评价标准,比较了不同再现距离的成像质量。文中提出方法在无需对光路进行对称设计的前提下,可同时对多个平面进行数字聚焦,延拓了菲涅尔数字全息重建图像的焦深。     

基于低秩稀疏分解的湍流退化图像序列的盲去卷积算法

针对湍流退化图像序列存在像偏移、像抖动和像 模糊的问题,提出一种基于低秩稀疏分解和多帧去 卷积的图像复原算法。首先分析大气湍流下图像序列的退化特征,然后在低秩稀疏分解的思 想下,采用非增广拉格朗日乘子(IALM)法优化由低秩 矩阵的核范数和稀疏 矩阵的Frobenius范数之和构成的目标函数,将湍流退化序列分解为低秩稳像和稀疏湍流两 部分;最后利用 多帧去卷积算法复原对齐的稳像。实验结果表明,本文算法能够有效校 正湍流像素偏移,在提高复原质量和速度方面取得了明显的效果。     

Analytical frameworks to incorporate demand response in long-term resource planning

Many utilities are obligated by state regulatory or legislative requirements to consider demand response (DR) as part of their resource planning process. There are several ways to incorporate DR into resource planning modeling and each has its advantages and disadvantages. We explore the current analytical frameworks for incorporating DR into long-term resource planning. We also consider whether current approaches accurately and realistically model DR resources in capacity expansion and production cost models and whether barriers exist to incorporating DR into resource planning models in a more robust fashion. We identify 10 specific recommendations for enhancing and expanding the current approaches.