http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
서울의 Penicillinase Producing Neisseria Gonorrhoeae 발생빈도(1994)
김재홍,안진균,정성재,김영태,김중환,김시영,이석종,이홍렬,서호석,김경훈,권혁진,정우권,고우석,이용석,안필수,오준규,오용섭 대한화학요법학회 1996 대한화학요법학회지 Vol.14 No.1
Background : In recent years gonorrhoea has been panendemic and remains one of the most common Sexually Transmitted Diseases in the world, especially in developing countries. Objective & Method : For the detection of a more effective therapeutic regimen and assessing the prevalence of Penicillinase Producing Neisseria Gonorrhoeae(PPNG), Ive have been trying to study the patients who have visited the VD Clinic of Choong-Ku Public Health Center in Seoul since 1980 by means of the chromogenic cephalosporin method. Results : In 1994, 168 strains of N. gonorrhoeae were isolated, among which 109 (64,9% ) were PPNG. Conclustion : Our results suggests that the prevalence of PPNG in Seoul is still increasing.
Dispersion mode of a Multiple-Quantum-Well in HgTe/CdTe superlattice
김석환 안동대학교 기초과학연구소 1996 基礎科學 硏究論文集 Vol.7 No.1
A finite HgTe/CdTe superlattice with different dielectric media on either side of the surfaces is investigated by taking into account the wave function overlap not only between the interface states and plasmons but also between the interface states. The unit cell of the finite HgTe/CdTe superlattice consists of two electron-like states and a heavy-hole like state in HgTe and two light-hole-like states in CdTe. We have studied the density-density correlation function considering the wave functions of three different interface states overlapping with the electron-like states, the light-hole-like states, and the heavy hole like states. Furthermore, we have calculated the collective excitation spectra of the intrasubband for both the hulk plasmons and the surface plasmons of interface states.
김석환 安東大學 1987 安東大學 論文集 Vol.9 No.1
The dissociation and combination process for molecules and atoms has been studied. Absorption of atoms in the surfaces and bulk is critically related to the details of the surface. So we consider surface potential, which is interaction Energy between adatoms and substrate atoms of metal. Technipues for solving the master equation for both discreate state and continuous state are given, after vibrational transition, the process may be treat using the steady state approximation. Rate constant are solved under equilibrium condition.
B_6O의 결합 속성과 Self-Consistent 계산
김석환 안동대학교 기초과학연구소 1992 基礎科學 硏究論文集 Vol.3 No.1
Using a basis set of about 11700 plane wave we performed ab initio self-consistent calculations of cohesive energy of B_(12)O_(2) and B_(12). Calculating stresses and forces, both lattice constants and positions of the atoms in the unit cell. Furthermore, we got the contours of charge density.
B_50와 B_48C_2의 결합속성과 Self-Consistent 계산
김석환 안동대학교 기초과학연구소 1991 基礎科學 硏究論文集 Vol.2 No.1
Using a basis set of about 12700 plane wave we performed ab initio self-consistent calculations of cohesive energy of B_(50) and B_(48)C_(2). Calculating stresses and forces, both lattice constants and positions of the atoms in the unit cell. Furthermore, we got the heat of formation and contours of charge density.
손기수,김석환 慶北大學校 自然科學大學 1985 自然科學論文集 Vol.3 No.-
The kinetics of hydrogen absorption on the basis of the two different states Hydrogen-binding was studied as a function of the temperature and the time. According to the our model, we get the hydriding and dehydriding kinetics by the use of its equation and obtain the parameter value a and b that depend on the E_s and E_D in case of the absorption. Furthermore we obtained two sticking coefficients S_1, S_2 with or without consideration of uptake rate respectively and represented them by reciprocal temperature.
천이금속 표면에서 수소원자 흡입, 분리 및 확산에 관한 동력학
손기수,김석환 慶北大學校 物理化學硏究所 1985 硏究論文集 Vol.6 No.-
천이금속의 수소 흡착, 분리 및 확산에 관한 연구는 활성 gas인 수소자체에 대한 연구 뿐만 아니라 수소를 흡입한 substrate에 대한 연구에도 크게 기여하여 최근에 이에 대한 연구가 다시 활발하여 지고 있다. R, J. Smith등은 천이금속 표면에 존재하는 수소는 두개의 상태를 갖을 수 있다고 가정하여 몇개의 극한 potential하에서 표면의 수소 charging과 수소가 진공으로 degassing할때 수소원자 비(θ)의 시간적인 변화와 ln(θ/1-θ)의 온도에 대한 비를 얻는 등의 연구들이 진행되고 있으나 이들은 bulk, surface, vacuum 사이의 편파적인 현상만 설명할 수 있었다. 이에 본 논문에서는 종래의 연구상황을 간략히 설명하고 나아가서 R. J. Smith의 two state model를 내포하는 새로운 model를 제안한다. Two state와 표면에 chemisorption layer를 부과하는 이 새로운 model로서 수소원자의 표면 adsorption, bulk속으로의 diffusion, chemisorption layer에서 수소분자의 dissociation후 표면 adsorption 혹은 dissociation된 수소원자의 recombination과정을 거쳐 desorption되는 사실들을 포괄성 있게 설명하여 이들의 남은 문제점을 파악하고 나아가서 앞으로 하여져야 할 과제들을 제시하고저 한다. Proposing a new model which includes two state model and chemisorption layer right above the surface atomic layer which interrelates the atoms in bulk and molecules in vacuum, the diffusion fromthe surface to bulk, adsorption on surface from chemisorption layer and desorption from chemisorption layer are explained. We also get the distribution of molecules versus time at the chemisorption layer, log(θ/1-θ), and atomic peak amplitude on surface versus the reciprocal temperature on equilibrium condition. These results are turned out to be good results, we derive the desorbing fraction as a linear function of inverse temperature.
전이금속의 Subsurface States와 그 동력학
손기수,김석환 慶北大學校 自然科學大學 1986 自然科學論文集 Vol.4 No.-
According to Christmann et al., there is one subsurface state on transition metal surface. We modify the kinetics for absorption of hydrogen in transition metals to include the effect of subsurface state. The modified kinetic equations show that the subsurface hydrogen atoms act as valve for admission of hydrogen into the bulk. We obtain the time rates of hydrogen charging and degassing on metal surface. We also get the dependence of the transition temperature on the bulk concentration and that of the subsurface faction on the temperature. The results, being compared with Lagos et al's result, turn out to be good. Furthermore, the transition temperature in this model is also studied.
Molybdenum의 사영에너지 Band와 정대 Gap
손기수,김석환 慶北大學校 1985 論文集 Vol.39 No.-
We have performed the tight binding calculations of BCC Molybdenum. By the use of the 34 Hamiltonian parameters which were obtained by fitting the bulk energy bands calculated by I. Petroff et al., we calculated bulk energy bands at more points than the number of points where Petroff did. Then we projected them into 2D. We have as many energy gap as in the case of iron. The extensive gaps show the possibilities of surface states and surface resonances.