• Journal of applied mathematics & informatics
• /
• 제24권1_2호
• /
• pp.529-534
• /
• 2007

We obtain an explicit expression of the loss probability for the PR/M/1/K queue when the offered load is strictly less than one.

• East Asian mathematical journal
• /
• 제14권1호
• /
• pp.43-62
• /
• 1998

• 한국수학교육학회지시리즈E:수학교육논문집
• /
• 제21권2호
• /
• pp.125-152
• /
• 2007

대학수학 학습지도에서 문제풀이가 잘못된 경우를 9개 영역으로 분류하고 각 영역마다 잘못이 일어나는 과정에 대한 세부 문항과 내용을 제시하고 오류를 지적해보도록 유도하며 올바른 문제풀이에 이르는 길을 확인하는 기회를 갖도록 한다. 이들 학습자료가 주는 중요한 의미를 여덟 가지로 요약하여 대학수학의 이해에 도움을 주고 대학수학 학습의 동기부여와 흥미를 느끼도록 안내하며 잘못된 풀이나 실수의 확인이 중요함을 일깨우고 분석하게 하여 깊이 있고 여유로운 수학학습을 생각할 기회를 제공한다.

• 한국수학교육학회지시리즈D:수학교육연구
• /
• 제6권1호
• /
• pp.81-96
• /
• 2002

This article describes a research project that examined the impact of hand-held technology on students' understanding linear equations and graphs in multiple representations. The results indicated that students in the graphing-approach classes were significantly better at the components of interpreting. No significant differences between the graphing-approach and traditional classes were found fur translation, modeling, and algebraic skills. Further, students in the graphing-approach classes showed significant improvements in their attitudes toward mathematics and technology, were less anxious about mathematics, and rated their class as more interesting and valuable.

• Korean Journal of Mathematics
• /
• 제6권2호
• /
• pp.149-154
• /
• 1998

We consider the ordered ${\Gamma}$-semigroups in which $x{\gamma}x(x{\in}M,{\gamma}{\in}{\Gamma})$ are left elements. We show that this $po-{\Gamma}$-semigroup is left regular if and only if M is a union of left simple sub-${\Gamma}$-semigroups of M.

• 대한수학회지
• /
• 제38권6호
• /
• pp.1245-1260
• /
• 2001

A demi-closed theorem and some new weak convergence theorems of iterative sequences for asymptotically nonexpansive and nonexpansive mappings in Banach spaces are obtained. The results presented in this paper improve and extend the corresponding results of [1],[8]-[10],[12],[13],[15],[16], and [18].

• Korean Journal of Mathematics
• /
• 제6권1호
• /
• pp.47-66
• /
• 1998

In this paper, we introduce an $L_p$ analytic Fourier-Feynman transformation, show the existence of the $L_p$ analytic Fourier-Feynman transforms for a certain class of cylinder functionals on an abstract Wiener space, and investigate its interesting properties. Moreover, we define a convolution product for two functionals on the abstract Wiener space and establish the relationships between the Fourier-Feynman transform for the convolution product of two cylinder functionals and the Fourier-Feynman transform for each functional.

• 대한수학회보
• /
• 제39권4호
• /
• pp.535-541
• /
• 2002

In this paper, we introduce the concept of lower semi-continuous from above functions and show that many well-known results, such as Ekland's and Caristi's theorems, remain also true under lower semi-continuous from above functions.

• East Asian mathematical journal
• /
• 제24권1호
• /
• pp.125-137
• /
• 2008

In this paper, we first introduce some iterative sequences of Halpern type for asymptotically nonexpansive mappings and nonexpansive mappings in Banach spaces and then we discuss strong convergence for the iterative processes. The results presented in this paper extend, supplement and improve the correspoding main results of Reich [11], Shimizu and Takahashi [13], Shioji and Takahashi [15], [16] and Wittmann [18].

• Korean Journal of Mathematics
• /
• 제5권2호
• /
• pp.135-139
• /
• 1997

We introduce the concepts of weakly prime and weakly semi-prime ideals in po-${\Gamma}$-semigroup and give some characterizations of weakly prime and weakly semi-prime ideals of po-${\Gamma}$-semigroups analogous to the characterizations of weakly prime and weakly semi-prime ideals of po-semigroups considered by N. Kehayopulu.