用ANN模型扩展COMGIS系统的地震灾害模拟仿真功能

利用组件式GIS(COMGIS)技术来开发结合了专业震害分析模型的城市地震灾害模拟仿真系统,在VB下调用Matlab的神经网络工具箱来扩展GIS的地震灾害模拟仿真功能。研究表明:设定地震可随机输入,在系统菜单下直接调用水平成层土地震反应分析程序SHAKE91来计算出与设定震级相对应的场地土层地震动参数;实现了基于BP神经网络的震害模拟仿真模型在COMGIS系统中的模块化;系统的GIS空间分析功能可使模拟仿真结果与空间信息相匹配,实现了随机假定地震下城市潜在地震灾害的快速评估。     

高精度多目标运动参数估计

针对连续波体制的测量雷达的应用场合,提出了一种多目标运动参数(速度、加速度)高精度的测量方法。该算法运用快速傅里叶变换和解线性调频(dechirping)补偿谱分析精确测速度和加速度,对加速度搜索步长的选择问题采用了逐次逼近法,则可在保证测量精度的同时,运算量大为减少,因而易于实时处理和工程实现。给出了应用该方法的具体工程实现,通过仿真实验证明该算法的有效性。     

DB模式下大型工程设计方案更改的Stackelberg博弈模型分析

我国大型工程DB总承包商通常是由设计单位和施工单位组成的联合体来承担,但各主体的利益诉求不同往往导致双方对设计方案改进和优化数量存在着讨价还价行为。通过对大型工程DB模式设计施工联动的过程分析,构建了施工单位和设计单位对设计方案更改数量的Stackelberg博弈模型,结果显示设计单位和施工单位能力、沟通和信任程度、利益共享和风险共担比例及联合体牵头人的干涉等都直接影响主体博弈行为。进一步以港珠澳大桥岛隧工程设计施工联动机制为例,给出了有效避免双方博弈过程中不利于工程目标行为的防范策略,为DB模式在我国大型工程建设中发挥更有效作用提供参考。     

变结构制导对未知目标机动的鲁棒性研究

研究了目标加速度测量噪声和未知目标机动对变结构制导规律鲁棒性的影响 ,分析了在这两种情况下 ,变结构制导规律鲁棒性应满足的条件。研究结果表明 ,不管对目标加速度测量噪声还是未知目标机动 ,只要合适地选择变结构制导规律中变结构项的参数 (与目标加速度测量噪声的幅值或未知目标机动幅值有关 ) ,就能保证命中目标 ,从而说明变结构制导规律是对机动目标进行拦截的最有效的制导规律之一。对比例导引、增广比例导引和变结构制导所做的仿真结果证实了该结论。     

具有中国特色的航天系统工程管理

系统工程管理方法成功地应用于我国的许多大型科研工程的管理。本文以航天工程为例,对新中国近三十多年来,在大型科研工程项目管理方面的理论研究和实践经验作了一个初步的总结。     

一种适用于助推段弹道导弹的跟踪方法研究

弹道导弹在助推段的运动特性较为复杂,且由于各级助推器的脱落导弹的加速度存在突变点,在导弹关机时刻的加速度突变最大,因此在跟踪时容易产生较大滤波偏差。本文主要对弹道导弹助推段的加速度特性进行了分析,选择CJ模型来描述其运动特性,采用交互式多模型(IMM)和无敏滤波(UF)算法对处于助推段的弹道目标进行跟踪。由仿真结果可以看出本文所提出的基于CJ模型和CA模型组合的IMM-UF跟踪方法可以较好地实现对助推段弹道导弹的跟踪。同时通过模型集合中各模型的概率变化情况可以很好地完成对导弹关机时刻的判定,这为后续尽早定轨和轨道预报等提供了前提。该算法结构简单实现稳定,具有较好的工程应用价值。     

基于循环平稳的动目标特征提取方法研究

介绍了基于循环平稳的脉冲多普勒雷达对目标回波信号参数的提取方法。分析了该参数提取方法的性能 ,结合弹载高重频脉冲多普勒雷达的特点 ,提出了一种动目标运动特征的递归提取方法应用于运动目标参数(速度、加速度 )的特征提取过程。分析、仿真实验证明 :该方法可以最大限度地利用系统的资源 ,在雷达信号处理中达到信噪比和加速度分辨率之间的动态平衡     

主动雷达型空空导弹最优末制导律工程研究

构造了拦截加速机动目标的空空导弹末制导状态模型。提出了脱靶量和横向加速度综合最小的导引指标,并用线性二次型的形式求解了最优导引律。从工程应用的角度出发,设计了能用于主动雷达制导弹的次优末制导律。大量的仿真试验表明,该导引律的性能好于比例导引律平均脱靶量小20.3%,所用横向加速度小28.1%,成功拦截率大13%。     

空间相机支杆组件的随机振动分析与试验研究

根据结构件随机振动的原理,利用MSC.NASTRAN有限元分析软件,对某空间相机碳化硅支杆组件进行了模态分析、随机激励下的加速度响应和峰值应力响应分析.研究了峰值等效原理在随机振动峰值应力预测上的应用,并进行了相关的地面振动试验.依据试验获得结构阻尼,修正有限元模型.将分析与试验数据进行了对比,结果表明该工程分析方法和技术途径是合理可行的.     

大型水利枢纽混凝土运输浇筑系统结构模型

本文根据离散事件动态系统仿真理论的建模方法,对某大型水利枢纽的混凝土工程进行了分析和研究,提出了混凝土拌和、运输、浇筑系统的结构模型.该模型具有较大的代表性和通用性,可推广应用于其它类似的工程和系统.     

建筑结构动力反应分析过程仿真表现方法

为了更好表现建筑结构动力仿真分析结果，研究利用多媒体表现技术与工程结构分析算法相结合的仿真表现新方法。论文阐述在复杂工程仿真中，运用体绘制算法，变形绘制算法，定性数据表达方法，快速绘制算法和连续仿真场景生成方法，特别是综合应用达到最优表现。具体说明了论文的方法在实现钢筋混凝土框架结构在地震作用下的结构动力反应的仿真表现中的实际效果，验证了这种仿真表现方法的有效性。在以Windows2000为操作系统，以OpenGL作为开发工具的微型机上实现这种复杂仿真表现，展现了多媒体仿真表现技术广阔的应用和发展前景。     

A Fast Recursive Algorithm for Positive and Inverse in Damped Wave Equation Problems

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Frequency domain polarization weighted ESPRIT method for bearing angle

The signal to noise ratio （SNR） of seismic waves is usually very low after long distance transmission. For this condition, to improve the bearing estimation capability in the low SNR, a frequency domain polarization weighted ESPRIT method using a single vector device is proposed. The frequency domain polari- zation parameters extracted from the signals are used to design the weighted function which is applied to the received signals. The bearing angle and the target frequency are estimated through ESPRIT using the weighted signals. The simulation and experiment results show that the presented method can obtain accurate estimation values under the low SNR with little prior information.     

Novel approach for improving signal to noise ratio of seismic images

A novel approach of digital image processing technology is applied to improve SNR of seismic images. At first,we analyze the characters of line-like texture in seismic images, and then a preprocessing method named 2 D tracing horizon filtering is designed. After that, the technology of optical flow analysis is adopted to calculate the displacement vectors of adjacent pixels between neighboring seismic images. At last, the novel image accumulation algorithms are proposed, which are applied to greatly improve SNR and definition of seismic images. The experimental results show that SNR of seismic section images with SNR of about 20 dB and 17 dB are increased 8 dB～9 dB under keeping signal energy 67%～80% by processing section images and 3dB～4dB under keeping signalenergy 80～90% by processing horizontal slice images. Thereby, the proposed novel approaches are very helpful to the correct seismic interpretation and have very important significance for seismic exploring.     

The 12th International Conference on Service Systems and Service Management ICSSSM'15

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Enterprise resource planning implementation decision & optimization models

To study the uncertain optimization problems on implementation schedule, time-cost trade-off and quality in enterprise resource planning (ERP) implementation, combined with program evaluation and review technique (PERT), some optimization models are proposed, which include the implementation schedule model, the timecost trade-off model, the quality model, and the implementation time-cost-quality synthetic optimization model. A PERT-embedded genetic algorithm (GA) based on stochastic simulation technique is introduced to the optimization models solution. Finally, an example is presented to show that the models and algorithm are reasonable and effective, which can offer a reliable quantitative decision method for ERP implementation.     

THE 8~(th) INTERNATIONAL CONGRESS ON INDUSTRIAL AND APPLIED MATHEMATICS

正August 10-14,2015Beijing,China The International Congress on Industrial and Applied Mathematics(IClAM)is the premier international congress in the field ofapplied mathematics held every four years under the auspices ofthe International Council for Industrial and Applied Mathematics.From August 10 to 14,2015,mathematicians,scientists and entrepreneurs fiom around the world will gather in Beijing,China for the 8th IClAM to be held at     

A calculus for services innovation

Innovation in the services area - especially in the electronic services （e-services） domain - can be systematically developed by first considering the strategic drivers and foci, then the tactical principles and enablers, and finally the operational decision attributes, all of which constitute a process or calculus of services innovation. More specifically, there are four customer drivers （i.e., collaboration, customization, integration and adaptation）, three business foci （i.e., creation-focused, solution-focused and competition-focused）, six business principles （i.e., reconstruct market boundaries, focus on the big picture not numbers, reach beyond existing demand, get strategic sequence right, overcome organizational hurdles and build execution into strategy）, eight technical enablers （i.e., software algorithms, automation, telecommunication, collaboration, standardization, customization, organization, and globalization）, and six attributes of decision informatics （i.e., decision-driven, information-based, real-time, continuously-adaptive, customer-centric and computationally-intensive）. It should be noted that the four customer drivers are all directed at empowering the individual - that is, at recognizing that the individual can, respectively, contribute in a collaborative situation, receive customized or personalized attention, access an integrated system or process, and obtain adaptive real-time or just-in-time input. The developed process or calculus serves to identify the potential white spaces or blue oceans for innovation. In addition to expanding on current innovations in services and related experiences, white spaces are identified for possible future innovations; they include those that can mitigate the unforeseen consequences or abuses of earlier innovations, safeguard our rights to privacy, protect us from the always-on, interconnected world, provide us with an authoritative search engine, and generate a GDP metric that can adequately measure the growing knowledge economy,     

论生物系统中的功能不守恒性

根据能量守恒定律，能量一次转换所做的总功应等于输入的总能量。但在生物系统中，能量的转换是多次的，其总功之和大于系统输入的总能量，此现象称之为功能不守恒性。能量转换效率越高，功能差别越大。能量通过细胞水平的多次转换，总功可提高至2倍左右。能量通过生态系统水平多次转换，总功可提高至1．4倍左右。通过系统内各子系统能流之和称为序能，反映了系统有序性大小，它取决于系统输入总能量和能量转换效率。根据序能原理，用GDP^2／9(GDP为国内生产总值，Q为能量总输入)反映人类社会功能和效率，要比单纯用GDP更客观。绿色GDP应同时考虑使GDP^2／Q增长最大和使自然生态系统的序能最大。人的经济行为和动物的行为对策也符合序能原理。