体系对抗仿真SEB组合建模方法论

体系对抗仿真已经成为武器系统作战效能评估和武器装备论证的有效手段。然而,目前缺乏对于体系对抗仿真建模方法的研究。总结了面向效能评估的导弹体系对抗仿真基本概念和特点,分析了体系对抗仿真模型描述中存在的主要问题,在此基础上,提出体系-实体-行为的分层组合描述方法,作为体系对抗仿真的建模方法,即SEB组合建模方法,并给出其参考模型和各个层次建模的参考视图。SEB组合建模方法将体系对抗仿真建模的复杂性分解到各个层次的建模当中,再通过组合形成完整的战场对抗体系模型,可以有效指导体系对抗仿真的建模工作。

非经典计量经济建模方法论的特征分析与比较研究

按照内容的沿革,计量经济模型分为经典计量经济模型和非经典计量经济模型。非经典计量经济建模方法论既是经典计量经济建模方法论的发展和延伸,又在建模理念、建模方法、模型应用等方面有着很大的不同。本文从数据类型、模型变量、建模对象、参数形式、建模思想等几个方面,对非经典计量经济建模方法论进行了系统的梳理、归纳和分析,重点比较了其与经典计量经济建模方法论的不同特征,对计量经济模型方法论发展演进的规律进行了初步的总结。

企业应用开发中的建模工具和建模方法论

建模工具的比较,某种程度上是其背后的建模思想和建模方法论的比较。本文选取了国内外若干颇具特色的建模工具,阐述并分析了各个工具的建模方法论。本文并不试图对各建模工具作出全面评测,也不试图对各建模方法论作出价值判断。只是希望为读者提供更多的事实和可供选择的方案,在一个更大的背景下,以更开阔和视野,来认识企业建模的工具和方法论。

现代计量经济学中的非均值模型:一个方法论角度的理论综述

按照建模对象不同,计量经济模型分为均值模型和非均值模型两大类。非均值模型是最近30年来,为克服传统的均值模型的缺陷发展起来的现代计量经济模型形式。首先对非均值模型进行了分类,回顾了各类非均值模型的理论发展和现实应用;然后在现代计量经济学的宏观视角下,分析了各自的建模原理;最后对非均值模型建模方法论的特点进行了理论归纳,并讨论了其对计量经济学方法论发展的推动作用。

现代信息系统建模方法研究

本文应用认知科学、信息科学、计算机科学的理论,研究现代信息系统的建模方法。文章从讨论建模方法论入手,重点探索对象建模、功能建模、事件建模等主要方法与技术,提出一种综合性的广义建模框架,力求有效地建立理想的信息系统模型。

建立企业通用信息模型的方法研究

提出了一套建立企业通用信息模型的方法,讨论了面向国防科技工业的企业通用信息的分析和分类方法,给出了信息模型的总体框架和构成要素,并建立了一套模型描述方法。所做研究将为广大企业建立其信息模型提供参考和支持。

Automatic Web services composition algorithm based on optimal matching

A novel layered method was proposed to solve the problem of Web services composition.In this method,services composition problem was formally transformed into the optimal matching problem of every layer,then optimal matching problem was modeled based on the hypergraph theory,and solved by computing the minimal transversals of the hypergraph.Meanwhile,two optimization algorithms were designed to discard some useless states at the intermediary steps of the composition algorithm.The effectiveness of the composition method was tested by a set of experiments,in addition,an example regarding the travel services composition was also given.The experimental results show that this method not only can automatically generate composition tree whose leaf nodes correspond to services composition solutions,but also has better performance on execution time and solution quality by adopting two proposed optimization algorithms.

Modeling Maintenance Activities on a Welded Construction Using IDEFO Methodology

The introduction of information technology and computers in the design process enables easier, faster and more accurate design of welding technology, as well as higher quality, repeatability and traceability of processes. This paper presents the modeling of welded construction maintenance activities by IDEF0 （Integration DEFinition） methodology. Modeling maintenance activities on a welded construction using IDEF0 methodology, the software implementation of which is the BPWin （Business Process windows） CASE （Computer Aided Software Engineering） tool, allows functional decomposition and design at all levels of the system that consists of workers, machines, materials, computers and information.

Modeling, identification and compensation for geometric errors of laser annealing table

In order to improve the process precision of an XY laser annealing table, a geometric error modeling, and an identification and compensation method were proposed. Based on multi-body system theory, a geometric error model for the laser annealing table was established. It supports the identification of 7 geometric errors affecting the annealing accuracy. An original identification method was presented to recognize these geometric errors. Positioning errors of 5 lines in the workspace were measured by a laser interferometer, and the 7 geometric errors were identified by the proposed algorithm. Finally, a software-based error compensation method was adopted, and a compensation mechanism was developed in a postprocessor based on LabVIEW. The identified geometric errors can be compensated by converting ideal NC codes to actual NC codes. A validation experiment has been conducted on the laser annealing table, and the results indicate that positioning errors of two validation lines decreased from ±37 μm and ±33 μm to ±5 μm and ±4.5 μm, respectively. The geometric error modeling, identification and compensation method presented in this work can be straightforwardly extended to any configurations of 2-dimensional worktable.

Modelling and analysis for a pilot relief valve using CFD method and deformation theory of thin plates

The current work is concerned with modelling and analysis for a pilot relief valve, thus successfully bringing a systematic method for designing and analyzing similar valves. The essence of the work is to solve two important problems, one for positions of the pilot valve influenced by flow force and the other is for the opening of the relief valve governed by a thin annular plate. The computational fluid dynamics(CFD) method is used to present the flow force. Using a series of experiments, the flow rate versus pressure drop shows the rationality of the CFD results. In order to obtain the opening of relief valve with higher accuracy, the large deflection theory of thin plates is adopted. An equivalent method for replacing the concentrated force is innovatively proposed so that all of the loads of the plates can be given by a unified expression, which reduces the number of the governing equations and intermediate boundary conditions. For presenting a very simple and reliable method for solving the governing equation, an unconstrained nonlinear optimization is innovatively introduced to solve the deflection of the thin annular plate. Being verified by finite-element method(FEM) of the relief valve, the equivalent method and optimization can solve deflection of thin plates rapidly and accurately. Reflected through a complete model for the pilot relief valve, the theoretical flow rate of the pilot relief valve is consistent with experimental conclusion. Once again, the comparisons bring us insight into the accuracy of the method adopted in the current work.