间断陡削化方法Ⅰ : 人为刚性源项方法——刚性常微分方程的计算方法的应用

本文针对界面运动的计算提出了适当附加人为刚性源项计算接触间断的方法。数值实验表明了这一方法是有效的。     

一种面向工程实际的专家系统的开发构思

面向应用领域中许多难度大，技术复杂的设计课题，本文探讨了专家知识的计算机程序系统。     

钱学森指导下的早期卫星准备工作

20世纪60年代初,四人小组在钱学森先生直接指导下为发展我国人造卫星进行早期准备工作。文章详细介绍了四人小组在钱学森先生指导下搜集学习国外有关卫星和空间技术的资料,编制《1964-1973年中国空间技术发展规划》（草案）,为大学生讲授星际航行概论课,以及担任星际航行座谈会秘书等工作。     

“Biospherics” approach for studies of natural and artificial ecosystems

The main unifying feature of natural and artificial ecosystems is their biotic turnover (cycling) of substances which is induced with energy fluxes. A new integrating scientific discipline – Biospherics – studies biotic cycles (both in experiments and in mathematical models) of different degree of closure and complexity. By its origin, Biospherics is to be connected with extensive studies of Biosphere by Russian academician Vladimir Vernadsky. He developed and used “empirical generalizations” based on innumerous observations, comparisons and reflections. His “bio-geo-chemical principles” of Biosphere and ecosystems development have more qualitative than quantitative nature. Quantitative criteria to evaluate the efficiency of natural and artificial ecosystems are to take into account energy fluxes and their use in ecosystems of different types. At least, three of them are of value for estimation of natural and artificial ecosystems’ functional activities. Energy principle of extensive development (EPED), energy principle of intensive development (EPID) and main universal (generalized) criterion (MUC). The last criterion (Principle) characterizes the specific cycling rate of limiting chemical elements in multi-organism systems, developing under external energy fluxes. Its value can be a quantitative measure of effectiveness for every ecosystem functioning, including our global Biosphere. Different examples of these (above-mentioned) integrated criteria actions are presented and analyzed in the paper.     

Modeling and Algorithm Application of Weapon Assignment System

In order to improve weapon assignment(WA)accuracy in real scenario,an artificial neural network(ANN)model is built to calculate real-time weapon kill probabilities.Considering the WA characteristic,each input representing one assessment index should be normalized properly.Therefore,the modified WA model is oriented from constant value to dynamic computation.Then an improved invasive weed optimization algorithm is applied to solve the WA problem.During search process,local search is used to improve the initial population,and seed reproduction is redefined to guarantee the mutation from multipoint to single point.In addition,the idea of vaccination and immune selection in biology is added into optimization process.Finally,simulation results verify the model′s rationality and effectiveness of the proposed algorithm.     

太阳能无人机能源系统的关键技术与发展趋势

作为探索临近空间领域的新兴飞行器，太阳能无人机（SUAV）在性能、技术及任务航时均呈现出不同于传统飞行器的新特点。其中，太阳能无人机能源系统的比能量、比功率是影响飞机整体性能的核心因素。因此，本文首先对太阳能无人机的太阳电池、储能电池的发展现状进行了阐述，然后针对能量获取多元化、能源系统管理高效化、能源载荷一体化方向对太阳能无人机能源系统的未来发展趋势进行了展望。     

Representing space in a PDP network: Coarse allocentric coding can mediate metric and nonmetric spatial judgements

In one simulation, an artificial neural networkwas trained to rate the distances between pairsof cities on the map of Alberta, given onlyplace names as input. Distance ratings rangedfrom 0 (when the network rated the distancebetween a city and itself) to 10. The questionof interest was the nature of therepresentations developed by the network's sixhidden units after it successfully learned tomake the desired responses. Analyses indicatedthat the network used coarse allocentric codingto solve this problem. Each hidden unit couldbe described as occupying a position on the mapof Alberta, and each connection weight feedinginto a hidden unit was related to the distanceon the map between the hidden unit and one ofthe stimulus cities. On its own, a singlehidden unit's response was a relativelyinaccurate distance measure. However, bycombining all six hidden unit responses in acoarse coding scheme, accurate responses weregenerated by the network. In a secondsimulation, a second network was trained tomake similar judgements, but was trained toviolate the minimality constraint on metricspace when trained to judge the distancebetween a city and itself. An analysis of thisnetwork indicated that it too was using coarseallocentric coding.     

BFBEST知识库生成系统设计技术

本文介绍了医学专家系统开发工具BFBEST的知识库生成系统设计技术。包括:(1)灵活友好的用户接口,(2)帮助用户避免输入知识时的语法和语义错误;(3)允许用户用领域规范化形式的知识与系统对话,输入知识;(4)具有事务薄记功能;(5)具有对知识库进行增、删、改的能力;(6)能对输入知识进行完整性和一致性的检查;(7)能将知识的机内表示复原成规范化的形式;(8)具有传授式的部分自动获取知识的功能。 BFBEST开发机是在IBM-PC机上用Turbo-Prolog语言实现的。它实用性强、智能化程度高,能用来快速生成各种高性能的医学专家系统知识库。     

5083铝合金力学性能的球压痕法检测研究

介绍了微压痕法在航空铝合金材料力学性能检测的研究.采用球形压头通过多级循环加载方法得到了5083铝合金材料压痕深度与载荷的关系,将微压痕数据输入经过充分训练的人工神经网络模型,计算出材料力学性能参数和材料应力应变曲线,对压痕法测量得到的材料真应力应变曲线与拉伸试验得到的结果进行了比较.     

变稳直升机设计与应用技术

变稳直升机在直升机研制过程中发挥着至关重要的作用。通过回顾美国、加拿大、德国等航空强国各个阶段典型变稳直升机研制历程,系统性梳理了变稳直升机研制中所涉及的几项关键技术,如变稳能力分析、变稳安全策略、变稳控制方法以及可变人感系统等。在此基础上,参照国外研制经验提出了上述技术的设计原则和相关要求。同时,对变稳直升机在飞行品质标准研究、新技术演示验证及飞行员培训等方面的应用进行了简要分析。