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约束网络

约束网络的相关文献在1992年到2022年内共计96篇,主要集中在自动化技术、计算机技术、机械、仪表工业、一般工业技术 等领域,其中期刊论文62篇、会议论文5篇、专利文献345240篇;相关期刊36种,包括农业机械学报、组合机床与自动化加工技术、机械科学与技术等; 相关会议5种,包括全球化制造高级论坛暨21世纪仿真技术研讨会、企业信息化高级论坛暨全国第12届CAD/CG学术会议、第11届机构学年会暨首届青年机构学研讨会等;约束网络的相关文献由217位作者贡献,包括熊光楞、李涛、张少彤等。

约束网络—发文量

期刊论文>

论文:62 占比:0.02%

会议论文>

论文:5 占比:0.00%

专利文献>

论文:345240 占比:99.98%

总计:345307篇

约束网络—发文趋势图

约束网络

-研究学者

  • 熊光楞
  • 李涛
  • 张少彤
  • 郑时雄
  • 彭颖红
  • 胡洁
  • 李祥
  • 王伟明
  • A.本森
  • D.巴斯
  • 期刊论文
  • 会议论文
  • 专利文献

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    • 刘腾; 陈健; 张月琴; 王莉
    • 摘要: 关联规则研究的发展为发现事务间的联系提供了基础,为信息推荐提供了依据.然而,现有的关联规则发现仅限于事务的关联支持度的强弱,即关联的有无,尚不能发现其在因果上的关联关系,故难以实现对信息连续推荐.为此,本研究从关联规则出发,根据CCU和CCC因果关系规则,提出一个基于点互信息(PMI,Pointwise Mutual Information)判据的方法,来发现事务间的因果关联关系.此方法以微学习单元为研究对象,首先利用传统关联规则从参考学习者的学习履历中提取具有关联关系的微学习单元,然后利用点互信息判据来发现微学习单元间存在的局部因果关系,并建立微学习单元的约束网络.实验表明,该方法可以有效发现微学习单元间的因果关联关系,并为学习者建立有效的动态学习路径.
    • 邱红铭; 韩鑫; 张剑; 张海柱
    • 摘要: 针对现有高速列车车体缺乏对多样化、个性化需求快速响应设计方法的研究,采用Top-down设计思想,提出一种基于约束网络的高速列车车体关联设计方法.通过关联设计实现装配信息变更影响在车体多层级骨架模型中自顶向下自动传递,并建立约束网络模型关联产品功能、性能、结构等多域特征信息,实现需求驱动的高速列车车体快速设计.以某车体侧墙模块设计为例,验证了该方法不但实现需求驱动的车体快速设计,而且通过建立显式的多域特征信息影响传播机制,保证多域特征参数变更设计的正确性.%In consideration of the problem of the lack of the rapid design method of high-speed train car body to response customer's diversified and individual demands, an approach by combining the top-down design philosophy with the constraint network is used to study the associated design method of the high-speed train car body in this paper. The alterations of assembly information can be transmit automatically from multi-level skeleton model of car body based on associated design technique is provided. Besides, the multi-field feature information such as product function, performance and structure could be associated by the constraint network, and then designers can depend on it to implement the demand-driven rapid design of high-speed train car body. Finally, in a car body sidewall module design as an example to validate the method can not only achieve demand-driven rapid design of high-speed train car body, and through establishing explicit multi-domain feature information dissemination mechanism, guarantee the correctness of the multi-domain feature parameters change design.
    • 崔阳; 刘长红
    • 摘要: 因果关联规则是知识库中一类特殊且重要的知识类型,相对一般关联规则,其优势在于能够揭示深层知识.首先对因果关系的特征和因果关联规则的挖掘方法进行了简介.针对在挖掘初始阶段如何限定可能导致结果的原因变量集合这一问题,运用了约束网络原理来构建一个实际系统变量间的因果关系结构.通过该因果关系结构可以比较容易地导出原因变量集合及各变量的类型,从而降低挖掘的复杂性,为提高挖掘结果的准确性提供有利条件.约束网络的引入优化了因果关联规则的挖掘过程,使之趋于更完备.
    • 王瑞伟; 李占山; 李宏博
    • 摘要: 表约束方法是1种外延式知识表示方法,每个约束通过元组集直接枚举出其在1个变量集上允许或禁止的所有元组,直观易于理解,在约束程序中得到了深入的研究,这是因为表约束出现在如设计、数据库、配置以及偏好建模等许多现实世界的应用中.但随着约束的增多及其元组集增大,占有的空间与相容性检测效率成了关键问题.eSTR是1个将STR扩展到高阶相容的算法,通过深入分析eSTR算法后发现有2种优化方式:PWsup数据结构和极小约束范围,同时证明了在极小约束范围上,约束网络仍然能够维持PWC+GAC ,其中极小约束范围可以通过删除约束元组集中相应的列来降低eSTR2算法的空间消耗,而 PWsup数据结构能够通过避免不必要的PW 支持检测来减少eSTR2的CPU 运行时间,实验结果表明:2种优化方式和eSTR2相结合后能够同时减少算法的空间消耗和CPU 运行时间,在许多类实例上明显优于eS T R2和eS T R2w .%Table constraints ,i .e .,constraints given in extension by listing all allowed (or forbidden) tuples ,are very straight forward and easy to understand ,which are intensively studied in constraint programming (CP) .Because such constraints are presented in many real world applications from areas such as design ,databases ,configuration and preferences modeling . However ,With the grow th of number of constraints and number of tuples , the space cost for table constraints and time cost of consistency checking have become key topics .eSTR is an algorithm which extends simple tabular reduction (STR) to higher‐order consistency .After in‐depth analysis of eSTR algorithm ,this paper proposes two kinds of optimized methods for eSTR :PWsup data structure and minimal constraint scope ,and then we prove that the constraint network enforce Pair‐Wise Consistency and Generalized Arc‐Consistency (PWC + GAC ) with minimal constraint scope is equivalent to original constraint scope .At the same time ,minimal constraint scope can reduce further space cost of eSTR2 algorithm by deleting columns of the tables in constraints ,and PWsup data structure can reduce the CPU running time by avoiding some unnecessary checking of Pair‐Wise‐support (PW‐support) ,since tuples in table of the constraint may not lose any PW‐supports on the tables of other neighbour constraints .The experimental results show that combining our methods with eSTR2 algorithm can obviously outperform eSTR2 and eSTR2w on many instances of different problems ,since it reduces the space cost and CPU running time of eSTR algorithm .
    • 沈铭瑜; 裘乐淼; 谭建荣; 伍晓榕
    • 摘要: The structure of modern mechanical and electrical products was more and more complex ,the reusability and efficiency of existing structure resources and knowledge in product design was too low .In this situation , a complex product subdivision structure active push technology driven by performance requirement was proposed in this study .The mapping of performance requirement to product structure was presented ,and the mathematical model of performance view and structure view was established with the aided of the quotient space theory , the transformation of performance requirement to product structure based on the feature similarity matching method w as implemented . T he model of complex product subdivision structure was constructed ,and achieved the reuse of the knowledge of structure design and design process from local structure granularity of parts .We used modified interpretive structural model (ISM ) technique to construct incidence constraint matrix and constraint network .A performance capture model was designed ,and completed the subdivision structure active push design based on the network linkage .Finally ,we developed an active push system of hydraulic press machine subdivision structure to validate the theory and technology we proposed .%针对现代机电产品结构越来越复杂,产品设计中已有结构设计资源的可重用性和调用效率低下等情况,提出性能需求驱动的产品细分结构主动推送设计技术。研究性能需求到设计结构的映射方法,以商空间理论描述产品结构视图,通过相似特征匹配实现性能需求到产品结构的映射转化。建立复杂产品细分结构模型,从零部件局部结构粒度上对结构设计知识及过程进行重用。利用改进的解释结构模型(IS M )建立细分结构关联约束矩阵和约束网络,通过设计性能捕捉模型,实现基于网络联动的细分结构主动推送设计。开发了液压机细分结构主动推送设计系统,结果验证了性能驱动的复杂产品细分结构主动推送设计技术。
    • 廉振宇; 王云; 陈成; 谭跃进
    • 摘要: 资源水平边界的估计是构建资源利用可行计划中的一个基础问题。通过分析航天器资源约束的共享与分离并存、累积与瞬时消耗并存、过度订阅与区间调度并存等特点,提出了资源时间网络、时间约束网络约束网络相结合的资源约束描述方法;构建了增量式基于包络的资源约束算法和最早开始时间链展开资源约束算法,以快速获取资源一致的柔性解。实例证明,该方法较好地解决了航天器调度的资源约束推理问题。%The estimation of resource level’s envelope is a basic problem in constructing a feasible schedule for resource utilization.A new resource reasoning description method that combining resource temporal network,constraint network and temporal network was proposed by analyzing the resource constraint characteristics,such as coexistence of sharing and detaching resource,coexistence of cumulative and instantaneous consumption,coexistence of over-subscription and interval scheduling resource.Considering the specific characteristic of resource temporal network,a resource model was constructed,and two algorithms of the EBA (Envelop Based Algorithm)based on maximal flow and the ESTAC (Early Start Time Algorithm with Chaining)based on early start time solution to solve with a resource feasible solution were given.The incremental EBA algorithm and ESTAC algorithm were presented to get a feasible solution quickly.Finally,some experiments were presented to prove the validity of the methods.Results show that the efficiency and validity of the proposed methods are better than EBA algorithm and ESTAC algorithm in solving the problems of resource constraint reasoning.
    • 高飞; 张元鸣; 肖刚
    • 摘要: 数字化设计是实施大批量定制的重要技术之一,建立设计模型是实现数字化设计自动求解的关键.通过深入分析产品设计知识,提出了基于需求参数→关键参数→结构参数三级驱动模型的数字化设计策略与方法.一级驱动以需求参数为输入,由方案设计系统推理及优化得出产品关键参数,二级驱动以关键参数为输入,驱动根据层次化策略建立的基于各种性能和结构推导的约束网络模型,得到各零部件的细化结构参数,三级驱动以细化结构参数为输入,驱动参数化的几何模型及远程的有限元分析模型,进行可视化几何与性能验证,同时基于Web技术实现了分布式数字化设计.以浙江省某起重机械厂的QD型桥式起重机数字化设计为例说明了上述策略和方法的有效性.
    • 王萌
    • 摘要: The dynamic backtracking algorithm keeps its assigned value for each variable when it backtracks. However, it becomes inefficient when it comes to the constraint satisfaction problems that do not consist of sub problems. To solve the problem, this paper applies graph partitioning to dynamic backtracking. The main idea is to divide all the variables into several sets using graph partitioning. When it back tracks, it gives up the values of the variables that are in the same set with the culprit variable, instead of keeping all the values. Experimental results show that the new method has higher efficiency on the random satisfaction problems.%动态回溯算法在进行回溯时保留所有已赋值变量的值,从而可能与后面赋值的变量产生冲突,其在解决不具有明显子问题结构的约束满足问题时效率较低.为此,将图分割技术应用于动态回溯,通过图分割将变量分为若干集合,当发生回溯时,不保留全部变量的值,舍弃那些与引起冲突的变量在同一集合变量中的值.实验结果表明,该算法在求解没有明显子问题结构的约束满足问题时具有较高的效率.
    • 张文成; 王红; 宋宝华
    • 摘要: 在分析产品开发所涉及的各领域设计原理、设计要求及设计目标的基础上,建立协同决策的约束网络模型,并设计了模型求解的约束优化算法,该算法将混沌方法的局部搜索与免疫算法的全局搜索相结合,增强了算法的细化搜索能力,且有效避免了算法陷入局部最优.将该决策优化方法用于单圆盘弹性转子的设计,获得了综合性能较优的设计方案,验证了方法的有效性与可靠性.
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