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采用动态数据库结构的产品管理技术 总被引:3,自引:0,他引:3
本文提出采用树状关系组织产品分类和建立产品数据库关系模型,按照无穷级概括映射规则设计产品分类的超类表和子类表,在防止约束循环的前提下建立约束关系等规则,并按上述规则开发动态数据处理器,通过Web方式操作动态数据处理器来设计、修改产品数据库结构和管理产品数据。在用户通过Web按自己的实际需求管理产品分类和产品数据的同时,动态数据处理器同时完成数据库结构的改动和处理所有的数据,完全实现通过Web方式管理产品;从而解决在电子商务网站及基于Web的PDM设计中,用固定的数据库结构难以适应产品种类的改变,难以详尽反映产品特征,数据库维护难度大的问题,使数据冗余更少,适用范围更广,用户界面更加良好。 相似文献
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一种自组织模糊神经网络控制器 总被引:12,自引:0,他引:12
采用一种具有结构和参数学习能力的自组织模糊神经网络控制器设计方法。这种控制器无需事先确定模糊控制规则,能在控制过程中通过神经网络的结构及参数学习在线调整模糊神经网络的结构、产生模糊控制规则、调整规则的参数。仿真表明该控制器能用于一定纯滞后时变对象的控制,具有良好的控制性能。 相似文献
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针对混沌系统建模引入模糊神经网络模型时隶属函数不具有自适应性,系统模糊规则数的确定有一定的人为主观性的问题,本文对模型参数进行遗传退火算法优化,然后利用自组织竞争网络优化模型结构,使模型具有最佳结构即最简单的模糊规则数;再对有最佳结构的模型进行参数优化,得到具有最佳结构和参数的建模模型。以一维的Logistic系统、二维的Henon系统和Mackey-Glass混沌时间序列为例进行仿真分析,结果表明模型能够拟合原混沌系统,精度良好而且结构最简。 相似文献
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一种基于资源约束的Agent组织规则生成机制 总被引:3,自引:1,他引:3
Agent组织是多Agent系统的一种求解结构,可以有效地降低求解难度和Agent之间的交互复杂性,对Agent组织的抽象包括组织结构,组织规则和组织模式,Agent组织规则的形成是Agent组织设计的重要问题之一,基于资源约束给出了Agent组织规则的形式描述和产生机制,设计了Agent组织规则形成的静态算法和动态算法,从而改进了Zambonelli和Jennings关于Agent组织规则的研究。 相似文献
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基于递阶遗传算法的模糊控制器的规则生成和参数整定 总被引:3,自引:0,他引:3
提出了一种基于递阶遗传算法的模糊控制器的优化设计方法.采用具有层次结构染色体编码方式的遗传算法来设计模糊控制器,实现了语言控制规则的自动生成和隶属函数参数的自动整定.设计过程无需系统的先验知识和训练数据,具有自组织、自学习的特点.仿真结果表明,该方法优化得到的模糊控制器结构简单、性能优良. 相似文献
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通过分析型材断面的尺寸和形状特征的继承关系及型材模块的结构变异,
将基因工程的思想用于产品族的开发设计中,并将“型材特征”看作是产品结构信息的
“DNA”。借鉴生物学领域基因工程原理,揭示了“型材特征”这种信息流在产品树中的传播规
律,在此基础上提出了一种基于基因工程思想的产品基因编码与重组方法。通过对产品族和
产品基因DNA 的概念以及产品族设计DNA 的内涵和研究内容的探讨,指出了支持产品基
因工程的关键技术,并以门体型材为例,说明产品族基因工程思想的设计效果。 相似文献
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The inheritance and variation of functional knowledge is an important way to achieve product innovation. Analogous biological genetic inheritance can solve the problems with the inheritance and variation of functional knowledge. However, the different expressions of functional knowledge in different domains lead designers to consuming a lot of time for functional knowledge characterization and identification, which reduces the efficiency of functional knowledge application. Therefore, in order to solve the problem of inefficient application of functional knowledge in the genetic process caused by irregular expression of functional knowledge, the paper proposes a digital characterization and identification process model of functional genes for product intelligent innovative design. The process model enables product intelligent innovative design through digital characterization of functional genes and rapid identification of functional genes using computer assistance. The process model consists of four following steps. First, extract functional knowledge from patents and perform preliminary functional gene characterization. Second, characterize functional genes digitally by using computerized digital coding techniques. Third, identify the required functional genes by using image similarity matching algorithm. It assists designers to quickly identify the functional genes required for the target system. Fourth, obtain the target product design scheme. By “transcribing” and “translating” the required functional genes and using TRIZ tools to solve the translated scheme, the product innovative design scheme is finally obtained. The feasibility and effectiveness of the model are verified by the intelligent innovative design of shared bicycle parking management device. 相似文献
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To enable next generation CAD tools to effectively support top-down design of products, a top-down assembly design process is refined from the traditional product design process to better exhibit the recursive-execution and structure-evolvement characteristics of product design. Based on the top-down assembly design process, a multi-level assembly model is put forward to capture the abstract information, skeleton information and detailed information involved. The multi-level assembly model is a meta-level implementation and is easy to be extended. Moreover, the inheritance mechanisms are explored to ensure the feasibility of information transferring and conversion between different design phases in the top-down assembly design process. A top-down assembly design sample is analyzed at length to show the application effects of the multi-level assembly model and the relevant inheritance mechanisms. In addition, a practical topic about the model adaptation of existing CAD systems is also discussed for a broader application of the top-down assembly design. Finally, the conclusion of the work and the future directions for further exploration are given. 相似文献
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ORDBMS的继承语义及其实现 总被引:3,自引:1,他引:2
介绍了在ANGEL这样一个典型的ORDB系统中继承机制的设计思想与实现技术,首先详细阐述系统卡富的继承语义,包括属性继承、约束继承、触发器继承及函数继承,并给出对多重继承所带来各种冲突的处理办法。然后讨论继承机制的实现手段及有关继承机制的模式演变问题。 相似文献
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介绍了禾本科作物基因枪介导遗传转化原理,转化受体,讨论外源基因的整治,遗传和表达,以及今后的前景。 相似文献
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软件Agent的继承性研究 总被引:3,自引:0,他引:3
Agent作为一种受限的智能对象,对Agent的继承特性进行深入研究并将继承机制嵌入到AOP(agent-oriented programming)中则具有重要意义.文章基于BDI Agent模型,对软件Agent的继承性和复制行为进行了研究.从单继承和多继承两个方面给出了Agent继承的语义,将Agent实例的动态复制机制形式地划分为功能分割、逻辑分割、择优分割和返祖分割这4类,分析了每类分割方式的作用,并基于电子市场系统应用背景给出了相应的实例. 相似文献
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P. Narain 《Computational statistics & data analysis》2009,53(5):1883-1893
A general theory of the Transmission Disequilibrium Test for two linked flanking marker loci used in interval mapping of a disease gene with an arbitrary mode of inheritance based on the genotypic relative risk model is presented from first principles. The expectations of all the cells in a contingency table possible with four marker haplotypes (transmitted vs. not transmitted) are derived. Although algebraic details of the six possible linkage tests are given, only the test involving doubly heterozygous parents has been considered in detail. Based on a test of symmetry of a square contingency table, chi-square tests are proposed for the null hypothesis of no linkage between the markers and the disease gene. The power of the tests is discussed in terms of the corresponding non-centrality parameters for each of the four modes of inheritance viz. additive, recessive, dominant and multiplicative. Sample sizes required for 80% power at the significance level of 0.05 have also been computed in each case. The results have been presented both for the case when the pair of markers is at the disease susceptibility locus as well as for the case when it is not so. In addition to the marker gene frequencies, recombination probabilities, and various association parameters, etc., it is found that the results depend on a composite parameter involving the genotypic relative risk of the homozygous disease genotype and the disease gene frequency instead of its constituents individually. The power increases with the decrease in the recombination probability in general but their magnitudes differ across the modes of inheritance. Additive and multiplicative modes of inheritance, in general, are found to give almost similar sample sizes. The sample sizes are found to be higher when the marker haplotype is not at the disease susceptibility locus than when the markers are there, indicating loss of power of the tests in the former case. But these are lower than the sample sizes required in the single marker case, thereby showing the superiority of the strategy in adopting the two marker loci for the transmission disequilibrium test. The use of linkage information between the markers seems to improve matters when this strategy is adapted for disease gene identification. The computations for sample sizes required for 80% power at the significance level of 5×10−8 used in TDT for fine mapping and genome-wide association studies indicate that the sample sizes needed could be several times larger than those for the traditional significance level of 0.05. 相似文献
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基于F-逻辑和O-逻辑,提出了一种带值限制的本体形式表示语言。一个本体包括类框架、槽框架、类槽框架以及个体框架。本体通过槽的框架来说明对该槽的一般值限制。本体中的一个类和一个槽对应着一个类槽;并且通过类槽的框架来说明用该槽来对这个类进行描述时的特定的值限制。在给出了本体的形式语法后,讨论了本体的继承机制;并且通过具体示例来对本体以及继承机制进行阐述。 相似文献
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ND-Polya类比实现技术 总被引:2,自引:0,他引:2
从认识论和方法论的角度来看,分类不是认识事物解决问题的唯一方法,类比同样十分重要.然而传统的继承只体现分类的方法.自行设计的面向对象语言ND-Polya通过引入新的继承机制——柔性继承来支持类比方法.使用柔性继承机制,程序员能以描述事物或问题间相似性的方式进行软件开发.文中简要介绍了ND-Polya的柔性继承设施,并在此基础上具体地讨论了该机制的类比实现技术. 相似文献