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Torsion Functors for Divisible Groups
You, Heung-Sang,Jeong, Hye-Ok,Han, Kyeong-Hee,Choi, Young-Mi,Park, Kyeongsu 전주대학교 자연과학종합연구소 2003 전주대학교 자연과학연구소 학술논문집 Vol.15 No.1
Let R be a principal ideal domain. If U is a divisible R-module, V, W are R-modules and X is a torsion R-module and 0→U→V→W→0 is an exact sequence of modules over R. then we have an exact sequence 0→Tor(X,U)→Tor(X,V)→Tor(X,W)→0.
Prime Spectra and Boolean Rings
You, Heung-Sang,Jeong, Hye-Ok,Han, Kyeong-Hee,Choi, Young-Mi,Park, Kyeongsu 전주대학교 자연과학종합연구소 2003 전주대학교 자연과학연구소 학술논문집 Vol.15 No.1
Let ø*: A→B be a ring homomorphism Let X = SpecA, Y = SpecB and let ø*: Y→X be the associated map. If B is a Noetherian Boolean ring, then ø* is a closed map.
한동숭,유흥상 한국학교수학회 2001 韓國學校數學會論文集 Vol.4 No.2
Since the computer is becoming more and more indispensible tool in every fields of the modern society, it is needed and desirable to utilize the computer as a basic tool from the very early stage of the education process. Recently Maple is gaining its popularity as a comprehensive mathematical software with its power of symbolic calculations and graphics as well as its great numerical computational ability. We demonstrate the suitability of this software as a tool for the mathematical education and presents several examples of the applications of Maple. For the middle and the high school mathematics courses, we give the application examples for the quadratic functions and their graphs, statistics, the three dimensional shapes, algebraic problems. Through the examples, we confirm that mathematical education can be much more effective and simple by using Maple. If we establish computer-assisted mathematical classes, we can draw more attention and excitement from the attendants than traditional classes and eventually improve more rapidly their problem-solving ability. On the other hand, the excess of the computer-aided education give to obstacle of psychological, not to be passing over the fact.
Lee, Young Soo,Yoo, Heung Sang,Kim, Yong Sung 又石大學校 1995 論文集 Vol.17 No.-
후랙탈 집합의 연구에 있어서 그 유사성은 후랙탈 구성요건의 첫째 조건이다. 유사성에 관한 몇가지 정의를 살펴보고 정리 4를 증명한다.