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WEAKLY CANCELLATIVE ELEMENTS IN SEMIGROUPS
신종문 한국수학교육학회 2010 純粹 및 應用數學 Vol.17 No.1
This paper gives some sorts of weakly cancellative of elements which are to be or not to be left magnifying elements in certain semigroups and gives a semilattice congruence in a weakly separative semigroup.
Certain integral representations of Generalized Stieltjes constants γk(a)
신종문 영남수학회 2015 East Asian mathematical journal Vol.31 No.1
A large number of series and integral representations for the Stieltjes constants (or generalized Euler-Mascheroni constants)γk and the generalized Stieltjes constants γk(a) have been investigated. Here we aim at presenting certain integral representations for the generalized Stieltjes constants γk(a) by choosing to use four known integral representations for the generalized zeta function ξ(s,a). As a by-product, our main results are easily seen to specialize to yield those corresponding integral representations forthe Stieltjes constants γk. Some relevant connections of certain special cases of our results presented here with those in earlier works are also pointed out.
Lightlike submanifolds of a semi-Riemannian manifold with a semi-symmetric non-metric connection
신종문 영남수학회 2015 East Asian mathematical journal Vol.31 No.1
We study the geometry of r-lightlikesubmanifolds M of a semi-Riemannian manifold -M with asemi-symmetric non-metric connection subject to the conditions;(a) the screen distribution of M is totally geodesic in M, and (b) at least one among the r-th lightlike second fundamentalforms is parallel with respect to the induced connection of M. The main result is a classification theorem for irrotational r-lightlike submanifold of a semi-Riemannian manifold of index r admitting a semi-symmetric non-metric connection.
Bismuth Based Perovskites for Solar Cell Application
신종문,송명관,강지원 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Lead-containing halide perovskite solar cells have attracted much attention recently because of their high-efficiency and low-cost. Despite its superior properties, the toxicity of lead and the instability of this lead-based perovskite under ambient air could be obstacles for future commercialization. Therefore, a key scientific challenge is to replace the lead in the perovskite crystal with a less toxic and a more stable. Beyond the Sn element, bismuth is chemically similar but more environmentally friendly. Furthermore, bismuth based perovskites (BP) materials have high optical absorption, and better chemical stability under ambient atmosphere than the lead based perovskite, which are suitable for solar cell application. BP has been reported on structural and optical properties of this material, but the results on solar cell performance were so far rather poor. Here, I will present on the synthesis, optical properties and high-efficiency with BP absorber materials.
Magnifying Elements in Some Semigroups
Shin, Jong Moon 동국대학교 경주대학 1998 東國論集 Vol.17 No.1
반군내에서의 임의의 completely regular 원소는 magnifying 원소가 아니라는 것을 보이고, 이 결과를 이용하여 어떤 반군내의 특정한 원소들이 magnifying 원소가 아니라는 것을 밝히고, 또 가역반군과 단순반군내에서의 magnifying 원소의 성질을 조사한다. This paper gives that any completely regular element in semigroup is not a magnifying element. Using this result, we show that some elements of certain semigroups are not magnifying elements. And we discuss properties of magnifying elements in inverse semigroup.
Nagatively Ordered M-Semigroups
Shin, Chong-Moon 동국대학교 경주대학 1983 論文集 Vol.2 No.-
Negatively ordered semigroup과 Negatively ordered M-Semigroup의 개념을 소개하고 이들 semigroup 상의 maximal 원소와 minimal 원소의 역할에 관하여 조사를 하고, 특히 이들 semigroup이 ordinally irreducible이 될 동치조건을 조사한 결과 다음과 같은 사실을 얻었다. (A) 소거율을 만족하는 negatively ordered semigroup이 ordinally irreducible이 될 동치조건은 그것이 항등원을 갖지 않는다는 것이다. (B) negatively ordered M-Semigroup이 ordinally irreducible이 될 동치조건은 그것이 nonempty proper absorbent completely prime ideal을 갖지 않는 것이다.