Approach to conceptual data integration for multidimensional data analysis in e-commerce

1 .INTRODUCTIONWith the development of contemporary electroniccommerce ,the multidi mensional data analysis onthe Web makesit necessarytointegrate various da-ta sources such as XML data and relational data onthe conceptual level .Extensible Markup Language(XML) is becoming the newstandardfor data rep-resentation and exchange on the World Wide Webquickly[1]. At present the most widespread concep-tual model is constructed by the Unified ModelingLanguage ( UML)[2]. UML is a visual mo…     

基于多粒度模型的导弹MDO方法研究

根据MDO环境的建模/仿真需求,针对某导弹多学科设计优化问题,分析了多粒度模型建模/仿真的必要性,以气动学科为例探讨了导弹MDO环境中多粒度模型的建模/仿真方法,研究了有限元分析软件FLUENT及其前处理软件GAMBIT的集成方法,并利用响应面分析、工程估算、数值计算三种方法对某导弹的气动学科进行多粒度的建模与解算,将输出的主要气动参数与风洞试验数据进行了比较与分析。研究结果表明多粒度模型的建模/仿真对提高导弹MDO效率具有重要意义。

Abstract：

According to the requirement of modeling and simulation in MDO environment, with consideration of missile’s Multidisciplinary Design Optimization problem, the necessity of modeling and simulation on multi-granularity model was analyzed. Taking pneumatic domain as an example, method of modeling and simulation on multi-granularity in missile’s MDO environment was discussed. The integration methods of finite element software FLUENT and its pre-processing software GAMBIT were studied. Through abundant experiments, data results of computing multi-granularity model were given using three methods, namely Response Surface Analysis, engineering prediction method and numerical computation method. Finally, comparison of the data got from above and from wind tunnel test was analyzed. The study results show that modeling and simulation on multi-granularity model are significant to improve MDO efficiency.     

基于作战单元的装备综合保障仿真评估研究

针对装备综合保障仿真评估中的三个方面的问题,提出了基于装备作战单元的建模方法,说明了针对装备作战单元建立综合保障仿真评估Petri网模型的方法,并给出了两个具体的仿真流程,说明了具体系统实现的方法。最后,以某装备作战单元为例,将获取的该装备的实际保障工作相关数据,按照所建立的仿真模型的输入要求输入仿真模型,根据模型输出数据,对仿真结果进行分析评估。

Abstract：

According to the three problems in simulation of ILS evaluation, the means of modeling, the method of building Petri net model of ILS simulation to the equipment basic combat unit, and the method of building the system were put forward. Taking an equipment as an example, input the actual support data to the simulation model constructed, and then the simulation result was analyzed. It proves that the model is correct and feasible.     

Synergistic Performance Management System and Its Associated Structural Model

Aiming at the widespread issues of synergistic performance management, a conceptual model of synergistic performance management system is built. The order parameter of system synergy and the main factors, as well as the degree of synergy and the concept of synergistic effect are proposed. An associated structural model of synergistic performance management system is established based on the method of structural equation modeling.     

基于UML的通用3D飞行仿真平台的设计与实现

一个能对不同飞行器进行仿真的综合性平台对飞行器建模和飞行控制算法设计等理论研究工作具有重要意义。采用基于UML的面向对象的程序设计方法,综合利用网络通信与3D视景仿真,数据库,模型库等技术,构建了基于局域网的分布式通用3D飞行仿真平台。通过为飞行器模型设计合适的接口,该平台可以适用于多种飞行器的仿真,大大减少了数据和代码的冗余,具有良好的飞行器通用性和功能扩展性。

Abstract：

Theoretical research on modeling and control of aircraft needs a platform to simulate and verify the correctness and accuracy.A distributed universal 3D flight simulation platform was designed based on UML Object Oriented modeling method,network communications,3D visual simulation,database and model base.This platform could be used for simulating various aircraft by well designed interface of aircraft models.The code and data redundancies are greatly reduced.The platform has a good aircraft universal availability and function augment ability.     

基于组件的水面战视景仿真系统关键技术研究

为了更加生动逼真地体现水面战视景仿真中导弹发射、导弹命中、舰炮开火、雷达搜索、干扰弹展开等攻防对抗的细节,针对仿真系统设计、组件化建模、组件化模型驱动等关键技术进行深入研究。提出了多粒度建模与替代子模型法相结合的组件化建模方法,通过配置链表内存映射的方法对组件化模型进行动态加载。所设计的基于组件的水面战视景仿真系统作为某大型分布式水面战仿真系统一个联邦成员,通过HLA接口接收联邦中相应联邦成员如导弹、火炮、雷达、干扰系统等的数据,在三维视景中驱动组件化模型。

Abstract：

In order to reflect more vivid details of attack and defense of surface warfare scene simulation such as missile launch, missile hit, gun fire, radar search and decoy expand, several key technologies including system designing, component-based modeling, component-based model-driven were researched. A component-based modeling method was proposed which combined multi-granularity modeling and sub-model replace. This method could load component-based model dynamically by list configuring and memory mapping. The component-based surface warfare scene simulation system designed as a federate of a large distributed surface warfare simulation system federation could receive data of the corresponding federate such as missile, artillery, radar and jamming system, and then the component-based model in the 3D scene was driven.     

Stability condition of FAST TCP in high speed network on the basis of control theory

Considering the instability of data transferred existing in high speed network, a new method is proposed for improving the stability using control theory. Under this method, the mathematical model of such a network is established. Stability condition is derived from the mathematical model. Several simulation experiments are performed. The results show that the method can increase the stability of data transferred in terms of the congestion window, queue size, and sending rate of the source.     

The Maximum Likelihood Method of Aerodynamic Parameter Identification

In this paper a method of aerodynamic parameter identification of vehicle, the maximum likelihood method, is introduced. The aerodynamic model of vehicle is identified and the basic equations using maximum likelihood method are established. After that, the simulation data is identified to verify the correctness of the mathematic model and identification method. Last, the practical flight data is identified and analyzed.     

Synchronization of chaos using radial basis functions neural networks

The Radial Basis Functions Neural Network （RBFNN） is used to establish the model of a response system through the input and output data of the system. The synchronization between a drive system and the response system can be implemented by employing the RBFNN model and state feedback control. In this case, the exact mathematical model, which is the precondition for the conventional method, is unnecessary for implementing synchronization. The effect of the model error is investigated and a corresponding theorem is developed. The effect of the parameter perturbations and the measurement noise is investigated through simulations. The simulation results under different conditions show the effectiveness of the method.     

Applying XML for designing and interchanging information for multidimensional model

1.INTRODUCTION Duringtherecentyears,theenterpriseshavebeen askingforsupportintheprocessofextractinguseful,concise,handyinformationfordecision makingoutof thetonsofdatastoredintheirexpensiveandcomplex informationsystems.Themultidimensionalmodeling isoneofitskeytechniques[1].AsstatedinRef.[2],oncedevelopersdefinethemultidimensionalmodel structure,userscandefineasetofinitialrequire mentsasastartingpointforthesubsequentdata anal ysisphase.Fromtheseinitialrequirements,userscan applyasetofon li…     

编队协同反潜概念模型研究

概念建模是当前仿真领域的关键技术之一,被用于连接真实世界和仿真模型,建立概念模型有利于实现仿真间的互操作和促进仿真资源的重用。分析了概念模型的建立过程,简要介绍了统一建模语言UML。结合编队协同反潜的特点,建立了实体、任务、动作和交互的概念模型,并利用UML对协同反潜军事活动进行了形式化描述。所建模型可以减小军事专家与仿真技术人员对该活动的认知偏差,缩短建模与仿真的工作周期。     

基于UML-ARENA的建模与仿真方法研究

为开发出便于复用、扩展的离散事件仿真系统,提出了一种新的建模与仿真方法——UML-ARE-NA。该方法利用统一建模语言UML对系统建模,利用仿真软件ARENA对所建模型进行仿真。该方法不仅规定了仿真系统的开发步骤,还设计了对象模型转换规则以及ARENA映射规则。整个开发过程分为建模与仿真两个阶段。在建模阶段,首先通过对系统进行概念分析,设计出系统的功能模型和动态模型。然后利用对象模型转换规则将功能模型和动态模型转化为对象模型。在仿真阶段,利用ARENA映射规则将对象模型转化为ARE-NA仿真程序。通过飞行保障过程的一个仿真实例对该方法的有效性进行了检验。     

基于UML的飞机维修保障仿真研究

统一建模语言(UML)是一种基于面向对象技术的标准建模语言,其不仅可以在软件开发过程中使用,也可在复杂系统仿真中应用。参照面向对象Petri网的建模过程,提出了一种基于UML的仿真建模方法,通过UML状态视图描述各个仿真实体的状态变化,使用顺序图描述消息交互的时间性,并通过协作图连接各个仿真实体。文中将该方法应用于飞机的维修保障仿真过程,并根据所建立的仿真模型,对仿真系统进行了实现,得到了较好的效果。     

军事想定规范化描述接口技术研究

建立想定静态信息模型可以分为标识事物、分类、寻找关系和定义特性等四个步骤。研究了UML的对象模型、关系、属性、基本数据类型以及类和类继承到XMLSchema的映射方法。最后建立了基于XML的想定数据描述规范——想定描述标记语言(SDML)。     

基于UML的多维数据概念建模方法研究

针对数据仓库中的概念建模,提出了一种改进的多维数据概念建模方法。该方法利用UML(unifiedmodelinglanguage)的扩展机制,通过定义相应的类,可以对数据仓库中概念建模的各种情况进行图形化描述。根据具体背景对该方法的应用进行了描述,并与其它的相关概念建模方法进行了对比。     

基于UML实时扩展的嵌入式软件测试用例生成技术

将统一建模语言(unified modeling language, UML)和对象约束语言(object constraint language, OCL)引入嵌入式软件测试领域,首先提出了一种基于UML实时扩展的嵌入式软件测试建模过程。然后,给出了UML状态图和类图的实时扩展方法。最后,结合航空电子系统嵌入式软件测试用例生成过程,详细阐述了被测系统的静态和动态建模,提出了扩展的测试序列定义及其生成方法,最终将所生成测试用例采用扩展标记语言(extensible markup language, XML)格式存储。工程应用验证表明,上述方法可充分发挥UML作为工业标准的工具资源优势,提高嵌入式软件测试用例生成的准确性、有效性和自动化程度。