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Using the finite volume method, a plane 2-D flow mathematical model under the body-fitted coordinate system is established. Taking Majiazui river reach in the middle of Yangtze River as an example, the computation results show the good agreement with the measuring data of the current velocity, water level. The model can not only be used to simulate flow movement in this complex reach, but also be...
This paper firstly combines the relevant knowledge of grey correlation analysis and interval deviation degree. Considering the reference sequence and the comparison sequences containing grey numbers, this paper gives a grey correlation analysis method based on the interval deviation degree, and its effectiveness is proved by an example.
Some existing similarity measures between vague sets are analyzed and some counter-intuitive examples for these methods are showed, which may lead to wrong deduction. A new method to calculate the degree of similarity between vague sets is proposed in this paper. With this method, all three parameters describing vague sets are taking into account when calculating similarity. This method improves the...
Algebraic method is one of important ways in the study of rough sets theory. One may profoundly understand the algebraic structure of approximation operator through this method research. In this paper, the related concepts with respect to Pawlak approximation space are briefly recalled. Then, the concepts of generalized approximation space and generalized approximation operators are firstly proposed,...
Universal logic principle has given 1-level universal conjunction operation model, universal disjunction operation model and universal implication operation model. A propositional calculus formal deductive system LU1 based on these 1-level operation models was built up. Moreover, it has been proved that the propositional calculus formal deductive system LU1 and the propositional calculus system...
In this paper the contractive, nonexpansive and asymptotically quasi-non expansive operators in fuzzy normed spaces are introduced and studied. Some convergence theorems are established for the iterative schemes of type Krasnoselski-Mann, type Kirk and type Ishikawa to approximate a common fixed point of two operators.
In this paper, we introduce the notion of fuzzy congruence relation, fuzzy order filter of the adjoint semigroup M(X) of BCK-algebra X. We discuss some characterizations of fuzzy congruence relations and fuzzy order filters. In the adjoint semigroup of a positive implicative BCK-algebra with condition(S), every fuzzy congruence relation may induce a fuzzy order filter of M(X), and every fuzzy order...
Fuzzy dynamic Petri nets model is proposed to process systems with vague information. Different from the traditional fuzzy Petri net systems, we address the Petri nets in the concept of net framework, instead of just a logical prediction system. Formal definition of dynamic Petri nets and its relation matrix description are given. Then, based-on the relation matrix, fuzzy dynamic algorithm is proposed...
This paper introduced fuzzy assessment of water quality based on membership grade by artificial neural network. Samples were obtained by intensive interpolation of water quality standards, relative MG matrix was output as expectation value for network's train and application. Then, improved fuzzy mathematics method was applied to assess the water quality of Qingdao Dagu River.
In the data base of information system, usually there are some attributes which are unimportant to the decision attribute, and some records that disturb the decision making. In this paper, reducing the condition attributes based on the matter-element theory and rough set method, calculating the importance to the decision attribute for each condition attribute after reduction, and data mining the relevant...
To achieve the production information management of the coning, drawing and twisting workshops, and promote a good and fast development of the textile enterprise, a multi-agent production monitoring and control system based on C/S mode is developed, through analyzing the actual requirements of the workshops, where the communication of the single-port-multi-protocol and a multi-thread data collection...
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