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Interval-valued Fuzzy Ideals and Bi-ideals of a Semigroup
정민석,허걸 한국지능시스템학회 2011 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.11 No.4
We apply the concept of interval-valued fuzzy sets to theory of semigroups. We give some properties of interval-valued fuzzy ideals and interval-valued fuzzy bi-ideals, and characterize which is left [right] simple, left [right] duo and a semilattice of left [right] simple semigroups or another type of semigroups in terms of interval-valued fuzzy ideals and intervalvalued fuzzy bi-ideals.
M-type Sr-Hexaferrite에서 MnCO<sub>3</sub> 첨가에 따른 소결 거동
정민석,유창재,조중영,문경석,Jeong, MinSeok,You, Changjae,Cho, Jung Young,Moon, Kyoung-Seok 한국분말야금학회 2020 한국분말재료학회지 (KPMI) Vol.27 No.2
The grain growth behavior of M-type Sr hexaferrite (SrM) grains is investigated with the addition of MnCO<sub>3</sub>. First, the SrM powder is synthesized by a conventional solid-state reaction. The powder compacts of SrM are sintered at 1250℃ for 2 h with various amounts of MnCO<sub>3</sub> (0, 0.5, 1.0, and 4.0 mol%). There is no secondary solid phase in any of the sintered samples. Relative density increases when MnCO<sub>3</sub> is added to the SrM. Obvious abnormal grain growth does not appear in any of the SrM samples with MnCO<sub>3</sub>. The average grain size increases when 0.5 mol% MnCO<sub>3</sub> is added to the SrM. However, as the amount of MnCO<sub>3</sub> increase to over 0.5 mol%, the average grain size decreases. These observations allow us to conclude that the growth of SrM grains is governed by the two-dimensional nucleation grain growth mechanism, and the critical driving force for the growth of a grain decreases as the amount of MnCO<sub>3</sub> increases.
THE LATTICE OF ORDINARY SMOOTH TOPOLOGIES
정민석,채갑병,허걸,김상목 호남수학회 2011 호남수학학술지 Vol.33 No.4
Lim et al. [5] introduce the notion of ordinary smooth topologies by considering the gradation of openness[resp. closedness] of ordinary subsets of X. In this paper, we study a collection of all ordinary smooth topologies on X, say OST(X), in the sense of a lattice. And we prove that OST(X) is a complete lattice.
정민석,황우섭,박진서,김진용,안영화,김재근,Jeong, Min-Seok,Hwang, U-Seop,Park, Jin-Seo,Kim, Jin-Yong,An, Yeong-Hwa,Kim, Jae-Geun 한국과학기술정보연구원 2001 지식정보인프라 Vol.5 No.-
컴퓨터를 쓰면 연속절단면 영상을 쌓아서 3차원 영상으로 재구성한 다음에 3차원 영상을 잘라 볼 수 있고 3차원 영상의 일부를 골라서 돌려 볼 수 있다[1,2]. 이처럼 사람 몸의 연속절단면 영상과 3차원 영상이 있으면 의과대학 학생과 일반인이 의학을 공부하는 데 도움이 된다(그림 1,2)[1-8,9].
정민석 대한영상의학회 1995 대한영상의학회지 Vol.32 No.4
Purpose : To evaluate normal variations and thus to avoid confusion in differentiation form lesions of theaccessory structures (rhomboid fossa, foramen for supraclavicular nerve, conoid tubercle) of the clavicle in chestradiographs. Materials and Methods : We studied the variations of the clavicle in 300 chest radiographs (134 men,166 women) and 355 dry bones (right 166, left 189 ; 151 men, 74 women, 130 unknown sex). Results : In chestradiographs, the incidence of the depressed rhomboid fossa was 229 cases (39.5%;male 52.0%, female 29.9%); theflat type was 329 cases (56.9%;male 45.7%, female 65.7%); and the elevated type was 20 cases (3.5%;male 2.4%,female 4.3%). In the dry bones, the incidence of the depressed rhomboid fossa was 129 cases (57.3%;male 59.6%,female 52.7%); the flat type was 65 cases (28.9%;male 24.5%, female 37.8%) and the elevated type was 31 cases(13.8%;male 15.9%, female 9.5%). The incidence of the foramen for supraclavicular nerve was 0.8% in chestradiographs, and 1.4% in the dry bones. The incidence of the elevated conoid tubercle was 64.1% (male 64.0%,female 65.9%) in chest radiographs, and 96.9% (male 95.4%, female 100.0%) in the dry bones. Conclusions : Theincidence of the depressed rhomboid fossa in chest radiographs was higher in men and the right clavicle. Theincidence of flat rhomboid fossa in chest radiographs decreased according to increase of age. The foramen forsupraclavicular nerve was occasionally found (0.8% in chest radiographs; 1.4% in the dry bones).