Distributive Disturbance and Optimal Policy in Stochastic Control Model

IntroductionThe relationship between the output volatility,taxation and macroeconomic performance has receivedconsiderable attention in recent years[110].The find-ings provide some valuable views on how risk affectstax policy and economic growth.All of th…     

编队防空导弹攻击火力分配优化模型

海上兵力优化分配是编队防空作战中的重要问题。利用对策论和线性规划等理论和方法，研究了编队防空导弹兵力分配问题，建立了舰艇编队防空突击概率模型、编队防空导弹兵力分配优化模型及其解法。给出了一个实例，并用线性规划方法得到了最优混合策略。此方法为舰艇编队防空导弹部署优化提供了一个基本思路。     

智能网联测试示范区多层级复杂交通流分配模式

技术的累积和科研的投入使得高等级自动驾驶在研究领域中不断突破,但自动驾驶车辆需经过覆盖多种场地的系统化测试以达到商用化标准。文章针对测试区管理要求建立了基于容量限制原则下针对区域非平衡模型条件非线性规划解法的多层级混合车辆的投放模型与分配优化方法。成果可为示范区不同智能化程度混合测试车辆交通投放分配提供标准方法与理论依据。     

An Object-Based Fast Motion Estimation Algorithm in MPEG-4

Introduction The MPEG has successfully developed theMPEG-4 standard[1]to address a wide range ofmultimedia data compression applications. As oneof the major parts of MPEG-4 standard, MPEG-4video aims at providing standardized core technolo-gies allowing efficient storage, transmission andmanipulation of video data in multimedia environ-ments[2]. Compared with its predecessor, MPEG-4 em-ploys many new compression techniques[3]. One ofthe main new features of MPEG-4 is its ability tore…     

旅客列车开行方案的双层规划模型和算法

在既有旅客列车开行方案研究的基础上,基于客运专线和高速铁路建设路网发展规划,分析旅客列车开行方案的相关费用和优化目标,均衡考虑企业利益和旅客需求,将列车开行方案与旅客换乘方案结合起来,以客流在铁路换乘网络上的分配作为下层规划,建立旅客列车开行方案优化的双层规划模型。通过抽象归纳制定开行方案的经验,将开行方案优化与客运径路确定、旅客列车换乘网络设计、旅客换乘的客流分配、旅客列车停站优化、旅客列车开行方案的评价指标分析等相关子问题结合起来,设计基于模拟退火算法求解的优化算法。根据优化模型和求解算法,开发铁路旅客列车开行方案优化系统,对某客运专线的开行方案实例进行测算,结果表明,该系统具有良好的优化质量和运算效率。     

Filling up gaps in wave data with genetic programming

A given time series of significant wave heights invariably contains smaller or larger gaps or missing values due to a variety of reasons ranging from instrument failures to loss of recorders following human interference. In-filling of missing information is widely reported and well documented for variables like rainfall and river flow, but not for the wave height observations made by rider buoys. This paper attempts to tackle this problem through one of the latest soft computing tools, namely, genetic programming (GP). The missing information in hourly significant wave height observations at one of the data buoy stations maintained by the US National Data Buoy Center is filled up by developing GP models through spatial correlations. The gap lengths of different orders are artificially created and filled up by appropriate GP programs. The results are also compared with those derived using artificial neural networks (ANN). In general, it is found that the in-filling done by GP rivals that by ANN and many times becomes more satisfactory, especially when the gap lengths are smaller. Although the accuracy involved reduces as the amount of gap increases, the missing values for a long duration of a month or so can be filled up with a maximum average error up to 0.21 m in the high seas.     

Multiple objective optimization of the fleet sizing problem for road freight transportation

A fleet sizing problem (FSP) in a road freight transportation company with heterogeneous fleet and its own technical back‐up facilities is considered in the paper. The mathematical model of the decision problem is formulated in terms of multiple objective mathematical programming based on queuing theory. Technical and economical criteria as well as interests of different stakeholders are taken into account in the problem formulation. The solution procedure is composed of two steps. In the first one a sample of Pareto‐optimal solutions is generated by an original program called MEGROS. In the second step this set is reviewed and evaluated, according to the Decision Maker's (DM's) model of preferences. The evaluation of solutions is carried out with an application of an interactive multiple criteria analysis method, called Light Beam Search (LBS). Finally, the DM selects the most desirable, compromise solution.     

基于改进DBSCAN算法的激光雷达目标物检测方法

传统的DBSCAN聚类算法是基于密度的聚类算法,原始算法在搜索精度和搜索效率上存在一定的局限性。基于LUX4线激光雷达数据点的点云特点,结合DBSCAN算法存在的不足与路面目标物的实际情况,提出了1种基于改进的DBSCAN聚类算法,选取4个代表点取代对所有点的搜索和改进搜索半径使其随扫描的距离而变化的方法,实现激光雷达目标物的快速、准确检测。通过改进DBSCAN算法对雷达数据进行去噪声和聚类处理,根据检测物在激光雷达探测中的形状特征模型进行形状匹配。实验结果表明该改进算法能较好的识别出目标物,行人检测率由原始算法的61.90%提高到了80.95%,搜索时间较原始算法缩短了44.7%,解决了原始算法精度低、搜索慢的缺点。     

地铁隧道结构断面测量方法探讨及编程实现

地铁隧道的结构断面测量是铺轨建设期间的一项重要工作,常规的测量方法内外业工作量较大,内业处理较为繁琐,数据计算效率较为低下。为了尽可能提高测量工作效率,减少仪器成本及人工成本,探讨了在地铁隧道内的控制点上架设全站仪,采用三维坐标测量的方法测得每个结构断面的特征点坐标,进而计算相应的断面尺寸偏差,并用C#编程语言编制了计算软件,使数据处理更为方便。工程实践表明,相比传统测量方法,该方法可以减少一定的外业工作量,同时内业数据处理相对简单便捷,效率高,可为类似工程提供参考。     

铁路空车调配问题的区间线性规划模型及算法

铁路空车调配问题是合理解决空车需求与供应之间的不平衡问题。在借鉴空车调配问题模型已有成果的基础上,围绕空车供应与需求量的不确定性、空车调配的时效性、路段通过能力的限制性3个方面,对区间数运用于空车调配问题加以适应性分析,以空车总走行公里最少和到达时间满足空车需求限定时间可信度加权和最大为目标,提出利用线性区间规划理论解决空车调配问题的模型和算法,并结合算例验证了区间规划的灵活性和简便性,使得空车调整模型符合运输生产实际并具有普遍意义,该模型的采用对路网上空车调整问题将起到很好的借鉴作用。