SF₆+Ar혼합기체의 MCS-BEq에 의한 전자분포함수

김상남,Kim, Sang-Nam 대한전기학회 2002 전기학회논문지 P Vol.51 No.1

Energy distribution function for electrons in $SF_6+Ar$ mixtures gas used by MCS-BEq algorithm bas been analysed over the E/N range 30-300[Td] by a two term Boltzmann equation and by a Monte Carlo Simulation using a set of electron cross sections determined by other authors, experimentally the electron swarm parameters for 0.2[%] and 0.5[%] $SF_6+Ar$ mixtures were measured by time-of-flight(TOF) method. The results show that the deduced electron drift velocities, the electron ionization or attachment coefficients, longitudinal and transverse diffusion coefficients and mean energy agree reasonably well with theoretical for a rang of E/N values.

시뮬레이션에 의한 CH₄ 기체의 전리 및 확산계수

김상남,Kim, Sang-Nam 대한전기학회 2014 전기학회논문지 P Vol.63 No.4

This paper describes the information for quantitative simulation of weakly ionized plasma. We must grasp the meaning of the plasma state condition to utilize engineering application and to understand materials of plasma state. Using quantitative simulations of weakly ionized plasma, we can analyze gas characteristic. In this paper, the electron Ionization and diffusion Coefficients in $CH_4$ has been analysed over the E/N range 0.1~300[Td], at the 300[$^{\circ}K$] by the two term approximation Boltzmann equation method and Monte Carlo Simulation. Boltzmann equation method has also been used to predict swarm parameter using the same cross sections as input. The behavior of electron has been calculated to give swarm parameter for the electron energy distribution function has been analysed in $CH_4$ at E/N=10, 100 for a case of the equilibrium region in the mean energy. A set of electron collision cross section has been assembled and used in Monte Carlo simulation to predict values of swarm parameters. The result of Boltzmann equation and Monte Carlo Simulation has been compared with experimental data by Ohmori, Lucas and Carter. The swarm parameter from the swarm study are expected to sever as a critical test of current theories of low energy scattering by atoms and molecules.

SF₆-Ar 혼합기체의 전자분포함수와 이동속도

김상남,Kim, Sang-Nam 대한전기학회 2010 전기학회논문지 P Vol.59 No.2

Distribution Function and Drift velocities for electrons in $SF_6$-Ar mixtures gases used by MCS-BEq algorithm has been analysed over the E/N range 30~300[Td] by a two term Boltzmann equation and by a Monte Carlo simulation using a set of electron cross sections determined by other authors, experimentally the electron swarm parameters for 0.2[%] and 0.5[%] $SF_6$-Ar mixtures were measured by time-of-flight method. The results obtained in this work will provide valuable information on the fundamental behaviors of electrons in weakly ionized gases and the role of electron attachment in the choice of better gases and unitary gas dielectrics or electro negative components in dielectric gas mixtures. The results show that the deduced electron drift velocities agree reasonably well with theoretical for a rang of E/N values.

$SF_6-N_2$ 혼합기체(混合氣體)의 전리(電離) 및 부착계수(附着係數)

김상남,Kim, Sang-Nam 대한전기학회 2009 전기학회논문지 P Vol.58 No.1

This paper describes the information for quantitative simulation of weakly ionized plasma. We must grasp the meaning of the plasma state condition to utilize engineering application and to understand materials of plasma state. $SF_6$ gas is widely used in industrial of insulation field. In this paper, $N_2$ is mixed to improve pure $SF_6$ gas characteristics. Electron transport coefficients in $SF_6-N_2$ mixture gases are simulated in range of E/N values from 70 to 400 [Td] at 300K and 1 Torr by using Boltzmann equation method. The results of this method. which are ionization coefficient, attachment coefficient, effective ionization coefficient, and critical E/N, can be important data to present characteristic of gas for insulation. Specially critical E/N is a data to evaluate insulation strength of a gas and is presented in this paper for various mixture ratios of $SF_6-N_2$ mixture gases.

시뮬레이션에 의한 SF₆-He 혼합기체에서 전자에너지 분포함수

김상남,Kim, Sang-Nam 대한전기학회 2014 전기학회논문지 P Vol.63 No.1

This paper describes the electron transport characteristics in $SF_6$-He gas calculated E/N values 0.1~700[Td] by the Monte Carlo simulation and Boltzmann equation method using a set of electron collision cross sections determined by the authors and the values of electron swarm parameters obtained by TOF method. This study gained the values of the electron swarm parameters such as the electron drift velocity, the electron ionization or attachment coefficients, longitudinal and transverse diffusion coefficients for $SF_6$-He gas at a range of E/N. A set of electron collision cross section has been assembled and used in Monte Carlo simulation to predict values of swarm parameters. The result of Boltzmann equation and Monte Carlo Simulation has been compared with experimental data by Ohmori, Lucas and Carter. The swarm parameter from the swarm study are expected to sever as a critical test of current theories of low energy scattering by atoms and molecules.

CF₄, CH₄, Ar 혼합기체의 전자이동속도

김상남,Kim, Sang-Nam 대한전기학회 2011 전기학회논문지 P Vol.60 No.3

Drift Velocity of Electrons in pure $CF_4$, $CH_4$ and mixtures of $CF_4$ and Ar. Have been analyzed over a range of the reduced electric field strength between 0.1 and 350[Td] by the two-term approximation of the Boltzmann equation (BEq.) method and the Monte Carlo simulation (MCS). The results of the Boltzmann equation and the Monte Carlo simulation have been compared with the data presented by several workers. The deduced transport coefficients for electrons agree reasonably well with the experimental and simulation data obtained by Nakamura and Hayashi. The energy distribution function of electrons in $CF_4$-Ar mixtures shows the Maxwellian distribution for energy. That is, f(${\varepsilon}$) has the symmetrical shape whose axis of symmetry is a most probably energy. The measured results and the calculated results have been compared each other.

CF₄, CH₄, Ar 혼합기체의 전자 평균에너지

김상남,Kim, Sang-Nam 대한전기학회 2015 전기학회논문지 P Vol.64 No.4

Energy Distribution Function in pure $CH_4$, $CF_4$ and mixtures of $CF_4$ and Ar, have been analyzed over a range of the reduced electric field strength between 0.1 and 350[Td] by the two-term approximation of the Boltzmann equation (BEq.) method and the Monte Carlo simulation (MCS). The calculations of electron swarm parameters require the knowledge of several collision cross-sections of electron beam. Thus, published momentum transfer, ionization, vibration, attachment, electronic excitation, and dissociation cross-sections of electrons for $CH_4$, $CF_4$ and Ar, were used. The differences of the transport coefficients of electrons in $CH_4$, mixtures of $CH_4$ and Ar, have been explained by the deduced energy distribution functions for electrons and the complete collision cross-sections for electrons. The results of the Boltzmann equation and the Monte Carlo simulation have been compared with the data presented by several workers. The deduced transport coefficients for electrons agree reasonably well with the experimental and simulation data obtained by Nakamura and Hayashi. The energy distribution function of electrons in $CF_4$-Ar mixtures shows the Maxwellian distribution for energy. That is, $f({\varepsilon})$ has the symmetrical shape whose axis of symmetry is a most probably energy.

시뮬레이션에 의한 CF₄, CH₄, Ar혼합기체(混合氣體)에서 전자(電子)에너지분포함수

김상남,Kim, Sang-Nam 대한전기학회 2003 전기학회논문지 P Vol.52 No.1

Energy Distribution Function in pure $CH_4$, $CF_4$ and mixtures of $CF_4$ and Ar, have been analyzed over a range of the reduced electric field strength between 0.1 and 350[Td] by the two-term approximation of the Boltzmann equation (BEq.) method and the Monte Carlo simulation (MCS). The results of the Boltzmann equation and the Monte Carlo simulation have been compared with the data presented by several workers. The deduced transport coefficients for electrons agree reasonably well with the experimental and simulation data obtained by Nakamura and Hayashi. The energy distribution function of electrons in $CF_4-Ar$ mixtures shows the Maxwellian distribution for energy. That is, $f(\varepsilon)$ has the symmetrical shape whose axis of symmetry is a most probably energy. The measured results and the calculated results have been compared each other.

The Occurrence of Giant Beta lslets in the Pancreas of the Calf

김상남,Kim, Sang-Nam 대한수의학회 1961 大韓獸醫學會誌 Vol.1 No.1

Insulin, Glucagon등의 홀몬과 Reserpine 및 Nicotine의 투여(投與)가 자우췌장(仔牛膵臟) Iangerhans도도(島嶋) 내분비세포(內分泌細胞)들에 미치는 현미경적(顯微鏡的) 및 전자현미경적(電子顯微鏡的) 영향(影響)을 연구(硏究)하는 도중 굉장히 큰 Iangerhans 도도(島嶋)들을 관찰하고 그 조직학적(組織學的) 세포학적(細胞學的) 특징(特徵)과 그 분포상태(分布狀態)를 구명(究明)하고저 한것이다. 연령(年齡) 2내지(乃至)4개월(個月)된 10두(頭) Holstein자우(仔牛)에서 췌장(膵臟)의 두부(頭部), 중간부(中間部) 및 미부(尾部)를 떼어서 Bouin 씨고정액(氏固定液)에 고정(固定)하고 파라핀절편(切片)을 만들어 Gomori의 Aldehyde Fuchsin stain에 의해서 Iangerhans도도세포(鳥鴨細胞)들을 염색(染色)하여 관찰하였다. 총괄(總括) 및 고찰(考察) 1. 지금까지 보고(報告)된 최대(最大)의 Iangerhans도도(島嶋)는 개에서 관찰된 333u 이었는데 본연구(本硏究)에서는 직경(直徑) 1,395u의 거대(巨大)한 도도(島嶋)를 관찰하였고 기리 2,700u에 달하는것을 보았다. 2. 췌장각부위별(膵臟各部位別)의 도도(島嶋)의 분포상태(分布狀態)는 다른 연구보고(硏究報告)들에 대체로 일치(一致)하였으나 그수(數)는 50평방(平方)mm에 평균(平均) 191개(個)로서 Trautmann이 보고(報告)한 125개(個)보다 66개(個)나 더 많은 수(數)이었고 직경(直徑) 200u이상(以上)에 달하는 도도(島嶋)의 백분율(百分率)은 평균(平均) 1.8%이었다. 3. 거대(巨大)한 Iangerhans도도(島嶋)은 거이 전부(全部)가 Beta세포(細胞)들로만 구성되어 있으므로 거대(巨大)Beta도도(島嶋)라고 이름지었으며 비록 그 수(數)는 적지만 한개의 거대(巨大)Beta도도(島嶋)가 차지하는 용량(容量)은 보통 크기의 도도(島嶋)가 차지하는 용량(容量)의 수백배(數百倍)에 달할것이므로 우췌장(牛膵臟)의 Insulin분비(分泌)를 연구(硏究)할 때에는 반듯이 이사실(事實)을 고려(考慮)해야 할것으로 생각된다. 4. 거대(巨大)Beta도도(島嶋)의 간질결합조직지주(間質結合組織支柱)는 매우 현저(顯著)하며 그 속에는 비교적 큰 동맥(動脈)과 정맥혈관(靜脈血管) 그리고 개재도관양(介在導管樣) 조직(組織)들이 있으며 거대(巨大)Beta도도(島嶋)들은 출생후(出生後) Iangerhans도도내외(島嶋內外)에 밀접하게 위치(位置)하고 있는 외분비(外分泌) 말초도세포(末梢導細胞)들이 증식(增殖)하여서 형성(形成)되는 것으로 믿어진다. 5. 거대(巨大)Beta도도(島嶋)의 Beta세포(細胞)들은 매우 뚜렷한 Negative Colgi images를 보이며 포장핵(胞狀核)과 비대(肥大)한 핵소고(核小高)들은 이 세포(細胞)들이 보통 도도(島嶋)의 Beta세포(細胞)들에 비(比)해서 더 활발(活發)한 분비작용(分泌作用)을 하고 있음을 시사(示唆)하는 것이다.

한우에 발생한 Globidium증의 병리 조직학적연구

김상남,후랭크 W. 스코필드,Kim Sang Nam,Schofield Frank W. 대한수의사회 1961 대한수의사회지 Vol.5 No.2

The public veterinarians in Kohung. and Soonchon areas in Cholla Namdo reported a contagious skin disease in Korean native cattle. the causative agent of which was unknown. The authors visited the areas in November 1959, and made a survey on the epizootio