计算机辅助金属塑性加工生产及其集成化

计算机辅助技术在各个领域的应用都取得了很大的成就,但各自独立的发展已经影响了它们在工业生产中的应用和推广,只有把它们集成起来才能进一步提高生产力,现生产自动化.此文阐述了金属塑性加工生产中的主要CA功能及其集成系统的形成.     

带毂直齿圆柱齿轮精锻的计算机模拟

此文利用上限法建立带毂直齿圆柱齿轮精锻过程的数学模型,并利用该模型对带毂直齿圆柱齿轮精锻过程中坯料外形尺寸和力一行程曲线进行了计算机模拟。对所得结果作了实验校核。实验结果与模拟结果吻合得较好,证明此文所建立的数学模型和模拟方法是可行的。     

精冲件计算机辅助分析系统的研究与开发

论述了精冲件计算机辅助分析系统的功能和图形识别提取技术及基于FoxPro的数据库技术,介绍了基于事例的人工智能技术在优化排样中的应用。     

环境数据库中的知识发现

介绍了数据库中知识发现的定义及其常用的发现方法，分析了数据库中知识发现的可能性和必要性，对能够发现的知识自理过程，可采用的方法进行了探讨。     

公共场合的计算机病毒防治

本文介绍了有关计算机病毒的一些基本知识，并根据长期的工作实践，提出了在计算机集中使用的公共场合病毒防治办法，以保证计算机的正常运行。     

民航机内非定常燃烧过程的计算机模拟

本文采用数值方法,对民航机内火灾非定常燃烧过程包括其内固体可燃物的受热热解及其挥发份的湍流气相燃烧进行了较为细致的计算,揭示了其火灾非定常燃烧的规律,得到了较好的结果。     

基于混合遗传算法的模拟电路自动设计研究

模拟电路在电子系统设计中具有重要意义．模拟电路设计包括电路拓扑结构设计和元件值设计，这两个方面对计算机辅助模拟电路设计都很重要．但是，传统的遗传算法在不断进化电路元件值时效率低．因此，本文提出一种具有超突变和精英策略的混合遗传算法HME-GA．该方法不仅可以用来设计电路的拓扑结构，而且可用于设计电路的元件值．实验结果表明，HEM-GA算法优于简单遗传算法GA，可作为计算机辅助模拟电路设计的有效方法，在模拟电路自动化设计中具有非常重要的意义和巨大的应用潜力．     

3D geometric structures and biological activity: Application to microbial soil organic matter decomposition in pore space

During the past 10 years, soil scientists have started to use 3D Computed Tomography in order to gain a clearer understanding of the geometry of soil structure and its relationships with soil properties. We propose a geometric model for the 3D representation of pore space and a practical method for its computation. Our basic idea consists in representing pore space using a minimal set of maximal balls (Delaunay spheres) recovering the shape skeleton. In this representation, each ball could be considered as a maximal local cavity corresponding to the “intuitive” notion of a pore as described in the literature. The space segmentation induced by the network of balls (pores) was then used to spatialize biological dynamics. Organic matter and microbial decomposers were distributed within the balls (pores). A valuated graph representing the pore network, organic matter and distribution of micro-organisms was then defined. Microbial soil organic matter decomposition was simulated by updating this valuated graph. The method was implemented and tested using real CT images. The model produced realistic simulated results when compared with data in the literature in terms of the water retention curve and carbon mineralization. A decrease in water pressure decreased carbon mineralization, which is also in accordance with findings in the literature. From our results we showed that the influence of water pressure on decomposition is a function of organic matter distribution in the pore space. As far as we know, this is the approach to have linked pore space geometry and biological dynamics in a formal way. Our next goal will be to compare the model with experimental data of decomposition using different soil structures, and to define geometric typologies of pore space shape that can be attached to specific biological and dynamic properties.     

Simulating the impacts of fire: A computer program

Recurrent fire has played a dominant role in the ecology of southwestern ponderosa pine forests. To assess the benefits or losses of fire in these forests, a computer simulation model, called BURN, considers vegetation (mortality, regeneration, and production of herbaceous vegetation), wildlife (populations and habitats), and hydrology (streamflow and water quality). In the formulation of the model, graphical representations (time-trend response curves) of increases or losses (compared to an unburned control) after the occurrence of fire are converted to fixedterm annual ratios, and then annuities for the simulation components. Annuity values higher than 1.0 indicate benefits, while annuity values lower than 1.0 indicate losses. Studies in southwestern ponderosa pine forests utilized in the development of BURN are described briefly.     

计算机辅助海运安全管理系统技术研究

以海运安全管理的基本理论与机制 ,强调保障安全必须通过管理实现对“人 -机 -环境”系统的有效干预 ,指出已实行数年的海运安全管理体系 (SMS) ,因系统庞大不便使用而妨碍了安全管理效能的发挥 ,而现有的管理信息系统技术对此作为甚小。鉴此 ,以语义Web和RDF技术为核心 ,研发了计算机辅助海运安全管理系统 (CASMS) ,包括海运安全文档知识库系统 (RDMS)、海运安全管理体系文档管理系统 (SMDS)、计算机辅助海运安全审核系统 (EES) ,为实现全面高效准确的SMS文件管理与工作表管理 ,提高海运公司和政府的SMS审核质量 ,实现地区级、国家级网络化安全管理提供了新技术。该技术可普遍用于质量管理体系、职业安全与健康管理体系、环境管理体系等系统及其综合系统。