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放射線을 照射한 Polyethylene의 電氣傳導度와 結晶化에 관한 硏究
金永銓,尹和重,徐日煥 충남대학교 기초과학연구소 1983 연구논문집 Vol.4 No.-
The conductivity in polyethylene (Sumikathen L-705) by bombardment with electron beam from a 2.5 MeV Van de Graaff and gamma ray from Co^60 has been investigated as a function of crystallization phenomenon, temperature, dose rate and applied electric field. The characteristics of volume resistivity(ρ)-temperature (T) of the specimens irradiated by gamma-ray show that ρ decreases with increasing radiation dose at room temperature, the (log ρ-1/T) curve gives a linear relation below 60℃ and their activation energies E=1.2 eV are larger than those of non-irradiated ones E=0.42 eV. Above 60℃ the decrease of ρ with temperature is less rapid until a rapid increase of ρ appears near the melting point 106℃ of the crystalline parts. This phenomenon is clearly observed in the polyethylene irradiated with a gamma radiation dose more than 10^4 rad. The (log ρ-1/T) characteristics of the irradiated specimen one heated above the melting point are different from those obtained in the first heating process, that is, the jumping phenomenon never appears.
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김영전(金靈田) 원광대학교 원불교사상연구원 2015 원불교사상과 종교문화 Vol.64 No.-
본 연구는 교육 생애사를 통해 ‘훌륭한 스승’의 의미와 교육맥락을 파악하는 것이 목적이다. 연구의 대상자는 50대의 원불교 여성 성직자 1인이다. 연구는 다음의 세 단계로 수행되었다. 첫째, 생애사 면담은 2회의 일대일 대면, 1회의 전화인터뷰로 총 3회 수행되었다. 면담의 내용은 녹음되어 전사하였다. 둘째, 면담내용은 핵심용어 도출과 수정 및 의미 분석의 질적 연구방법론을 활용하였다. 셋째, 연구과정에서 발견한 연구자의 ‘학습경험’과 연구요소들과의 상호작용을 분석하였다. 연구결과 연구 요소간 관계는 1단계 ‘연구자와 연구주제 및 연구대상의 분리’, 2단계 ‘연구자와 연구주제 및 대상의 상호작용의 발생’, 3단계 ‘연구와 연구자의 결합’이다. 훌륭한 스승의 생애사적 요소는 ‘소명의식’, ‘처처불상 사사불공’, ‘반성과 자기계발’, ‘인과의 믿음’이다. 마지막으로 연구자에게 ‘훌륭한 스승’의 생애사적 체험에 관한 연구는 학습의 장이 될 수 있음을 고찰하였다. This study aims to understand the meaning and educational contexts of a ‘great teacher’ through his or her Education Life History. The subject of this study is one female Won-buddhism minister in her mid fifties. The study was conducted in three steps: First, the researcher conducted face-to-face interview three times. Qualitative analysis of interview contents were carried as to derive the keywords and pedagogical significance. Interactions between research elements and the ‘learning experience of the researcher in the process of study were analyzed. The relationships between research components are “the separation of researcher, research topics and subjects”, “the occurrence of interactions between researcher, research topics and subjects”, “the combination of research and researcher”. The components of a great teacher life history are “Calling consciousness”, “Chuchubulsangsasabulgong(處處佛像事事佛供)”, “Reflection and self-development”, “Belief in cause and effect (因果).”
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The Crystal and Molecular Structure of Thiamine Dichloride Monohydrate
Suh, Il-Hwan,Kim, Young-Jurn 충남대학교 기초과학연구소 1982 연구논문집 Vol.3 No.-
Thiamine dichloride monohydrate (C_12H_18Cl_2N_4OS·H_2O)의 構造를 graphite-monochro-mated Mo K_a X-線을 使用하여 automated four-circle diffractometer로 부터 測定된 1602個의 intensity data로 밝혔다. 結晶은 空間群 P2_1/n의 單斜晶系에 屬하며 單位細胞常數는 a=6.975(1), b=20.555(4), c=11.727(2)A, β=98.78(2)°이고 z=4이다. 構造는 direct method로 糾明하였으며 full-matrix 最小自乘法으로 精密化하여 最終 R 값은 0.0974이었다. Pyrimidine 고리와 thiazolium 고리는 實驗誤差範圍內에서 平面을 이루고 있으며 이 두面은 pyrimidine 고리에 붙은 amino group과 thiazolium 고리의 水素를 갖는 炭素原子가 接近하도록 78°의 二面角을 이루고 있다. 一個分子內에는 四個의 分子內水素結合이 있고 各分子들은 四個의 分子間水素 結合으로 이어져 있다. The crystal structure of thiamine dichloride monohydrate, C_12H_18Cl_2N_4OS·H_2O, has been determined from 1602 significant independent reflections collected on an automated four-circle diffractometer using graphite-monochromated Mo K_a radiataion. The crystal is monoclinic, space group P2_1/n, with unit cell dimensions a=6.975(1), b=20.555(4), c=11.727(2) A, β=98.78(2)° and z=4. The structure was solved by direct methods and refined by the full matrix least-squares method to R=0.0974. Both the pyrimidine and thiazolium rings are planar within experimental errors. The planes of the pyrimidine and thiazolium rings are at a dihedral angle of 78°, and are turned so as to bring the amino group closer to the hydrogen-bearing carbon of the thiazolium ring. There are four intramolecular hydrogen bonds, and the molecules are linked together by four intermolecular hydrogen bonds.
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李善鏞,金永銓,尹和重,徐日煥 충남대학교 자연과학연구소 1982 忠南科學硏究誌 Vol.9 No.1
The crystal structure of silicon has been determined by X-ray powder diffraction study (Cu Kα radiation). The unit cell is cubic (diamond-type), F(2/d)3, with a=5.42 A˚, V=159.22 A˚^3, z=8, D_c=2.34gr/㎤. The structure was solved by graphical method using eleven powder diffraction data. The experimental and theoretical integrated intensities of the reflecting planes are in good agreement with each other. The silicon atoms have tetrahedral arrangement to form covalent bonds with four other atoms. The nearest interatomic distance is 2.34Å.
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李善鏞,金永銓,張忠根,徐日煥 충남대학교 자연과학연구소 1982 忠南科學硏究誌 Vol.9 No.1
The crystal structure of potassium chloride and potassium bromide have been determined by X-ray diffraction method. Both unit cells are face-centered cubic, F(4/m)3￣(2/m) z=4 but a=5.2857Å, V=248,348Å^3, D_c=1.989 gr/㎤ for KCl and a=6.5891Å, V=286.074Å^3, D_c=2.756 gr/㎤ for KBr. the structures were solved by graphical method using thirteen KCl and eleven KBr powder diffractometer data. The agreement between the experimental and theoretical integrated intensities of the reflecting planes is fairly good. The crystal are aggregates of positive and negative ionic atoms. Each atom has six nearest neighbors of the other kind. The distances between unlike atoms are 3.1429Å in KCl and 3.2945Å in KBr.
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