Journal of Computer Science and Cybernetics
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Phép tách suy biến của một quan hệ trong cơ sở dữ liệu
Journal of Computer Science and Cybernetics - Tập 3 Số 2 - Trang 1--3 - 2018
In this paper we introduced the notion of ternary degenerate decomposition of a relation and inverstigated its properties. By application of this degenerate decomposition it can be captured more semantics of data in a relational database.
Tối ưu hóa việc mở rộng quy mô và khai thác một hệ thống
Journal of Computer Science and Cybernetics - - 2016
This paper presents a method to construct an optimal control problem of a system connected with scale expand and exploit as control a random process.
Accelerated methods for solving grid equation I
Journal of Computer Science and Cybernetics - - 2016
In this paper we propose a technique accelerating the convergence rate of the known iterative schemes for solving grid equations such as the alternately triangular method and the alternating direction method. Our idea is by the parametric extrapolation of the solutions of equations, which can be solved faster than the original ones. The effeciancy of the accelerated methods is shown on example.
Áp dụng lý thuyết đổi mới trong quản lý giá trị - kho hàng hóa
Journal of Computer Science and Cybernetics - Tập 6 Số 3 - Trang 1--6 - 2018
In this paper, by the general theory, a method to predict of items which character to value goods are managed by warehousemen is demonstrated. They must be choose the optimal time for the put and sell a lot of goods at their godown. By Turbo Pascal V.5 on IBM PC AT we outperform those results.
Câu trả lời gần đúng cho truy vấn null trên mô hình cơ sở dữ liệu hướng đối tượng mờ thiếu thông tin.
Journal of Computer Science and Cybernetics - Tập 27 Số 4 - Trang 329-340 - 2012
Lập luận tương tự la một cong cụ suy diễn quan trọng trong nghien cứu của tri tuệ nhan tạo. Truy vấn Null la những truy vấn ma no nhận một cau trả lời Null từ hệ thống cơ sở dữ liệu, thường la vi thong tin khong đầy đủ trong cơ sở dữ liệu (CSDL). Lập luận tương tự thật sự rất la hữu ich để tạo ra một cau trả lời gần đung cho truy vấn Null. Lập luận tương tự sử dụng phụ thuộc ham mờ để trả lời cac...... hiện toàn bộ
Nghiên cứu tin học trong điều khiển các quá trình công nghệ tại nhà máy xi măng Hoàng Thạch
Journal of Computer Science and Cybernetics - - 2016
For near 10 years, the Institute of Informatics has carried out many researches on computer sciences applied in controls of engineering processes at Hoang Thach cement factory. In this paper, some main computer system for controls of engineering processes, the computer system for control of production quality, the computer system for control of automatic apparatus. The new computer systems h...... hiện toàn bộ
A NOVEL EXTENSION METHOD OF VPFRS MODE FOR ATTRIBUTE REDUCTION PROBLEM IN NUMERICAL DECISION TABLES
Journal of Computer Science and Cybernetics - Tập 40 Số 1 - Trang 37--51 - 2024
Attribute reduction is an essential application of the Rough Set (RS) theory that has been receiving the attention of many researchers. Up to now, attribute reduction methods to improve classification accuracy on noisy datasets following the IFRS approach still have many limitations in terms of computation time. In this paper, we use the Variable Precision (VP) method on approximate Operators of t...... hiện toàn bộ
#Rough set #Variable precision rough set #Fuzzy rough set #Variable precision fuzzy rough set
ON THE TESTING MULTI-VALUED MARTINGALE DIFFERENCE HYPOTHESIS
Journal of Computer Science and Cybernetics - Tập 34 Số 3 - Trang 233--248 - 2018
This paper presents a definition of Multi-Valued Martingale Difference (MVMD) based on Castaing representation of a multi-valued martingale that consists of martingale difference selections. Testing the Multi-Valued Martingale Difference Hypothesis (MVMDH) then examined. Testing the Martingale Difference Hypothesis (MDH) earlier was based on linear measures then later developed two directions in ...... hiện toàn bộ
#Martingale Difference Hypothesis #Multi-Values Martingale Difference #Generalized Spectral Analysis #Exchange Rates
RECENT RESULTS ON CARDINALITY ESTIMATION AND INFORMATION THEORETIC INEQUALITIES
Journal of Computer Science and Cybernetics - - 2021
I would like to dedicate this little exposition to Prof. Phan Dinh Dieu, one of the giants and pioneers of Mathematics in Computer Science in Vietnam.
In the past 15 years or so, new and exciting connections between fundamental problems in database theory and information theory have emerged. There are several angles one can take to describe this connection. This paper takes one such angle, influen...... hiện toàn bộ
#Shannon-type inequalities #Cardinality Estimation #Conjunctive Queries #Information Theory
Điều khiển PID hai mức với điều kiện hạn chế modan
Journal of Computer Science and Cybernetics - Tập 15 Số 1 - Trang 38-44 - 2016
The problem dealt with in this paper is synthesis of two - level optimal PID control, which is at the first level to solve Riccati equation on PC and at the second to calculate optimal control variable on micro-controller. The proposed algorithm of this two - level PID will guarantee the quadratic performance index and desired arrangement of poles and zeros of closed system (so-called mod an limit...... hiện toàn bộ
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