• Proceedings of the Korean Institute of Intelligent Systems Conference
• /
• 2004.04a
• /
• pp.394-397
• /
• 2004

In this paper, we consider interval number-valued random variables and fuzzy number-valued random variables and discuss Choquet integrals of them. Using these properties, we define the Choquet expected value of fuzzy number-valued random variables which is a natural generalization of the Lebesgue expected value of Lebesgue expected value of fuzzy random variables. Furthermore, we discuss some application of them.

• Journal of Advanced Marine Engineering and Technology
• /
• v.22 no.1
• /
• pp.16-20
• /
• 1998

The critical reynolds number in a square-sectional straight duct is investigated experimentally. The experimental study for the air flow in a square-sectional straight duct is carried out to calssify critical Reynolds number on steady flow and unsteady flow. To calssify the critical Reynolds number we obtained velocity waveform by using a hot-wireanemometer and data acquisition system with photocorder.

• Journal of the Chungcheong Mathematical Society
• /
• v.22 no.2
• /
• pp.229-234
• /
• 2009

Let f : $X{\rightarrow}X$ be a self-map of a connected finite polyhedron X. In this short note, we say that the mod H Nielsen number $N_H(f)$ is well-defined without the algebraic condition $ f_{\pi}(H)\;{\subseteq}H$ and that $N_H(f)$ is the same as the q-Nielsen number $N_q(f)$ in any case.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2000.05a
• /
• pp.635-638
• /
• 2000

The propose of study analyze a TEMA(Tubular Exchanger Manufacturers Association) E shell and tube heat exchanger performance with 3, 5, 7, 9, 11 baffles and 16, 20 tubes. In this investigate measured a variation of the heat exchanger cooling capacity change within each number of baffle and tube number and determined optimal number of baffle. designs for industry applications are optimized using the analysis of test results.

• Journal of the Korean Data and Information Science Society
• /
• v.16 no.4
• /
• pp.933-942
• /
• 2005

Recently, the decrease of the number of the third graders in a high-school have serious influences on the number of a limit matriculation of colleges and universities. The purpose of this paper is to forecast for the number of a high-school graduate until 2022 year in Daegu city as based on the resident registration population. As the based period of 2004, most college and universities in Daegu city have to reduce the 37.5% of the number of limit matriculation until 2022 year to equal the number of the third graders in a high-school.

• Journal of the Korean Data and Information Science Society
• /
• v.16 no.4
• /
• pp.969-977
• /
• 2005

Recently, the decrease of the number of a high-school graduate have serious influences on the number of a limit matriculation of colleges and universities. Based on the resident registration population, we forecast for the number of a high-school graduate until 2022 year in kyungbook. Most college and universities in Kyungbook have to reduce the 67.8% of the number of limit matriculation until 2022 year to avert a disaster by prompt action.

• Journal of applied mathematics & informatics
• /
• v.24 no.1_2
• /
• pp.313-323
• /
• 2007

The equitable total chromatic number ${\chi}_{et}(G)$ of a graph G is the smallest integer ${\kappa}$ for which G has a total ${\kappa}$-coloring such that the number of vertices and edges in any two color classes differ by at most one. In this paper, we determine the equitable total chromatic number of one class of the graphs.

• Korean System Dynamics Review
• /
• v.1 no.2
• /
• pp.91-111
• /
• 2000

Causal maps or cognitive maps have been widely used to get insights for complex systems or decision makers. When insights come from the system behavior rather than its structure, we need simulation of causal maps and cognitive maps. In this paper, a method for directly converting causal maps and cognitive maps into stock-flow diagrams that can be simulated in computers in proposed. This method is called as NUMBER. NUMBER is an abbreviation for 'Normal Unit Modeling By Elementary Relationship'. In this paper, NUMBER is applied to a cognitive map of policy maker to show its usefulness.

• East Asian mathematical journal
• /
• v.31 no.3
• /
• pp.357-362
• /
• 2015

For a ring R of imaginary quadratic integers, using a concept of a unitary number system in place of the Motzkin's universal side divisor, we show that the following statements are equivalent: (1) R is Euclidean. (2) R has a unitary number system. (3) R is norm-Euclidean. Through an application of the above theorem we see that R admits binary or ternary number systems if and only if R is Euclidean.

• Proceedings of the Korea Society for Simulation Conference
• /
• 2001.05a
• /
• pp.164-168
• /
• 2001

The Multiple Recursive Generator(MRG) has been considered by many scholars as a very good Random Number generator. For the long period and excellent statistical properties, the method of the combination with random number generators are used. In this paper, for two-combined MRGs, we examine the statistical properties and show the importance of the seeds likewise other random number generators. And we modify the two-combined MRGs and verify the statistical superiority.