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借助软集合,提出了格蕴涵代数的软LI-理想的概念,研究了软集运算下的一些诸如交、且等基本性质,并给出了格蕴涵代数的软LI-理想的一些等价刻画。此外,研究了格蕴涵代数的软LI-理想与格蕴涵代数的软格理想之间的关系。得到了格蕴涵代数的软LI-理想像与原像的性质。 相似文献
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1 引言约束数据库近期被Kanellakis等提出作为处理空间数据的一般性框架。约束数据库用约束来建模和检索数据。在数据层,约束能用有限的形式来表示可能是无限的关系元组集。例如,约束x~2 y~2≤9表示中心在点(0,0)处,半径为3的圆。在查询语言层,约束通过允许数学计算而增强了简单关系语言的表达能力,同时约束查询语言保留了关系查询语言的所有特征,如封闭性和自底向上求值。关系代数能被扩充来处理约束关系,这个新的代数叫做约束代数CALG。 相似文献
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约束概念格的代数性质及其知识表示的完备性 总被引:2,自引:0,他引:2
约束概念格是一种依据用户对数据集的兴趣、认识等作为背景知识而构造的概念格结构。文中利用约束概念格结点之间的上下确界运算,构造约束概念格的代数系统,证明约束概念格的若干代数性质,以及知识表示的完备性,从而为约束概念格的应用奠定理论基础。 相似文献
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课程安排问题是典型的组合优化和不确定调度问题。采用约束逻辑程序设计的研究方法,结合课程安排自身的特点,通过约束推理找到最优的课程安排结果。约束逻辑程序设计综合了人工智能中一致性算法和启发式搜索算法,采用约束推理方法,能非常好地处理各种冲突,并且能快速地排出合理的课程。 相似文献
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The authors survey the research and development in Sweden in constraint programming, which is rapidly becoming the method of choice for some kinds of constraint problems, such as scheduling and configuration. 相似文献
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We present a stochastic version of Concurrent Constraint Programming (CCP), where we associate a rate to each basic instruction that interacts with the constraint store. We give an operational semantic that can be provided either with a discrete or a continuous model of time. The notion of observables is discussed, both for the discrete and the continuous version, and a connection between the two is given. Finally, a possible application for modeling biological networks is presented. 相似文献
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Manuel Hermenegildo 《Constraints》1997,2(1):63-69
We propose a number of challenges for future constraint programming systems, including improvements in implementation technology (using global analysis based optimization and parallelism), debugging facilities, and the extension of the application domain to distributed, global programming. We also briefly discuss how we are exploring techniques to meet these challenges in the context of the development of the CIAO constraint logic programming system. 相似文献
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Constraint Programming: Strategic Directions 总被引:1,自引:0,他引:1
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Bioinformatics aims at applying computer science methods to the wealth of data collected in a variety of experiments in life
sciences (e.g. cell and molecular biology, biochemistry, medicine, etc.) in order to help analysing such data and eliciting
new knowledge from it. In addition to string processing bioinformatics is often identified with machine learning used for
mining the large banks of bio-data available in electronic format, namely in a number of web servers. Nevertheless, there
are opportunities of applying other computational techniques in some bioinformatics applications. In this paper, we report
the application of constraint programming to address two structural bioinformatics problems, protein structure prediction
and protein interaction (docking). The efficient application of constraint programming requires innovative modelling of these
problems, as well as the development of advanced propagation techniques (e.g. global reasoning and propagation), which were
adopted in Chemera, a system that is currently used to support biochemists in their research. 相似文献
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林琪 《计算机工程与科学》1997,19(1):68-72
约束逻辑程序设计(CLP)方法是提高PROLOG语言效率的一种崭新方法,本文针对SC┐PROLOG解释系统的实现介绍其相应设计思想,从域变量含义入手,提出了域及约束的存储方法以及约束机制的实现算法,是对逻辑设计方法研究的一点体会 相似文献
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《Expert systems with applications》2014,41(15):6773-6785
Constraint Databases represent complex data by means of formulas described by constraints (equations, inequations or Boolean combinations of both). Commercial database management systems allow the storage and efficient retrieval of classic data, but for complex data a made-to-measure solution combined with expert systems for each type of problem are necessary. Therefore, in the same way as commercial solutions of relational databases permit storing and querying classic data, we propose an extension of the Selection Operator for complex data stored, and an extension of SQL language for the case where both classic and constraint data need to be managed. This extension shields the user from unnecessary details on how the information is stored and how the queries are evaluated, thereby enlarging the capacity of expressiveness for any commercial database management system. In order to minimize the selection time, a set of strategies have been proposed, which combine the advantages of relational algebra and constraint data representation. 相似文献
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