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RISS 인기검색어
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- 저자 : Jang Y.N.(張永南) (검색결과 6 건)
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장영남,성낙훈,채수천,배인국,김인종,Jang Y.N.,Sung N.H.,Chae S.C.,Bae I.K.,Kim I.J. 한국결정학회 1997 韓國結晶學會誌 Vol.8 No.1
A new weighing sensor for the automatic diameter control system of the crystal growth is developed in this study. This weighing sensor measures the frequency of the vibrating element which is lineally changing with respect to weight. The signal and the power of this system are transmitted without any physical contact, so that this sensor offers high accuracy and resolution. This system consists of a string, a sinusoidal wave generator, an automatic amplification adjusting circuit, signal transformers and a PCB. 4 kinds of programs are developed for checking DAC, weight calibration and controlling growth process. The measurements of the standard deviation and the resolution show $\pm0.10g$(measured at every second) and $5{\times}10^{-5}$, respectively, This weighing sensor is effective under high pres-sure of 200 atm, high temperature and vacuum condition. The weighing system can control the temperature in the accuracy of $\pm0.025^{\circ}C$ with the 'signal divider'. The optical quality single crystals of $(YGd)_3Sc_2Ga_3O_{12},\;Er-Y_3Sc_2Al_3O_{12},\;and\;Bi_{12}GeO_{20}$ have been grown by Czo-chralski method using this auto-diameter control system. 새로운 방식의 결정성장용 직경 자동제어장치를 개발하였다. 이 장치는 금속선의 장력 변화를 주파수로 변환시켜 감지하는 무게센서로서 신호전달 및 전력공급 체계가 무접촉 방식이므로 노이즈가 극소화되며 따라서 안정성, 정밀성이 종래의 센서에 비해 10배 이상 증대된다. 이 장치에서 무게센서 부분은 1) 금속선, 2) 시그날을 형성하는 Sinusoidal Wave Generator, 3) 형성된 시그날의 진폭을 조정하고 안정화 시켜주는 자동 증폭조절회로, 4) 정류장치 및 신호 변환기, 5) 시그날을 관리, 제어하는 PC 보드 등으로 구성하였고, 그 외에 2개의 검증용, 무게보정용, 성장제어용 등 4개의 프로그램을 작성하였다. 이 장치는 표준편차 값이 $\pm0.10g$(1회/sec 측정 때), 분해능이 $5{\times}10^{-5}$이고, 최대 200kg까지 결정을 성장시킬 수 있으며, 또한 압력조건은 진공조건부터 200 atm 이하, 온도조건은 $350^{\circ}C$ 이하에서 일관성, 재현성 있는 작동이 가능했다. 단결정 자동직 경제어에 필요한 정확도를 확보하기 위해 온도범위 $100^{\circ}C$가 $\pm0.025^{\circ}C$로자동 조절되도록 '시그날 Divider'를 제작하였다. 이 무게 센서를 $Y_3Sc_2Ga_3O_{12},\;Er-Y_3Sc_2Al_3O_{12},\;Bi_{12}GeO_{20}$ 등의 단결정 성장에 응용하였으며 매우 양호한 결정을 성공적으로 성장시킬 수 있었다.
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慶南 梁山地域에 分布하는 火山岩類의 地球化學的 特性硏究
Kim M.Y.(金炆,榮),Shin H.J.(申虹子),Lee P.K.(李匉,九),Jang Y.N.(張永南) 대한자원환경지질학회 1988 자원환경지질 Vol.21 No.2
The altered volcanic rocks, ranging from tuffaceous to andesitic rocks are widely distributed around the “caldera” area in the southeastern part of Kyeongsang province. The volcanic activity and tectonic movement are assumed to be followed by the hydrothermal activities in the area. From the mineral assemblage the type of alteration can be divided into two types ; propylitic and argillic. The average concentration of gold in hydrothermally altered rocks is somewhat lower (about 20 ppb) than that of fresh rocks (45-25 ppb), but for Ag, vice versa. During the hydrothermal process, the concentration of the trace elements Ag, Hg, Co, As, Hf, Sc, Si, Al increased, and that of Na, Rb, K, Au, Mg, Ca etc. decreased. The high anomalous contents of silver for altered rocks range from 4-7 ppm and 1-3 ppm for relatively fresh rocks.
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경남(慶南) 양산지역(梁山地域)에 분포(分布)하는 화산암류(火山岩類)의 지구화학적(地球化學的) 특성연구(特性硏究)
김문영,신홍자,이평구,장영남,Kim, M.Y.,Shin, H.J.,Lee, P.K.,Jang, Y.N. 대한자원환경지질학회 1988 자원환경지질 Vol.21 No.2
The altered volcanic rocks, ranging from tuffaceous to andesitic rocks are widely distributed around the "caldera" area in the southeastern part of Kyeongsang province. The volcanic activity and tectonic movement are assumed to be followed by the hydrothermal activities in the area. From the mineral assemblage the type of alteration can be divided into two types; propylitic and argillic. The average concentration of gold in hydrothermally altered rocks is somewhat lower (about 20 ppb) than that of fresh rocks (45-25 ppb), but for Ag, vice versa. During the hydrothermal process, the concentration of the trace elements Ag, Hg, Co, As, Hf, Sc, Si, Al increased, and that of Na, Rb, K, Au, Mg, Ca etc. decreased. The high anomalous contents of silver for altered rocks range from 4-7 ppm and 1-3 ppm for relatively fresh rocks.
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양환승,문영희,최은석,장민수,이진하,장영남,Ryang, H.S.,Moon, Y.H.,Choi, E.S.,Jang, M.S.,Lee, J.H.,Chang, Y.N. 한국잡초학회 1991 Weed&Turfgrass Science Vol.11 No.2
토양중(土壤中)에서 생육억제(生育抑制)에 필요한 유효농도(有效濃度)를 식물별(植物別)(화본과 I.R, 십자화과무)로 알아보기 위하여 무균한천배지(無菌寒天培地)에 제초제(除草劑) 4종(種)을 농도수준별(濃度水準別)로 처리(處理)하여 생육억제(生育抑制)를 조사(調査)한 결과(結果)는 다음과 같다. 1. 공통(共通)된 석향(傾向)으로 4종(種)모두 초장(草長)보다는 근장억제(根長抑制)가 보다 컸으며 무 보다 I.R에 대한 억제(抑制)가 월등(越等)하게 컸다. 2. I.R의 근장(根長)과 초장(草長)을 50% 이상억제(以上抑制)시키는 농도(濃度)는 nitralin 0.036ppm과 0.132ppm이고 napropamide는 0.027ppm과 0.071ppm이었다. 또 pendimethalin은 0.063ppm과 0.097ppm이고 ethalfluralin은 0.042ppm과 0.092ppm이었다. 그러나 무의 근장(根長)과 초장(草長)을 50% 억제(抑制)시키는 농도(濃度)는 nitralin은 1.028ppm과 10ppm 이상, napropamide는 0.515ppm과 10ppm 이상이었다. pendimethalin은 1.925ppm과 4.885ppm, ethalfluralin은 2.669ppm과 10ppm 이상이었다. This experiment was conducted to identify the relationships of concentration with phytotoxic rate of dinitroamide and acid amide herbicides which have showed the longest residual period in soil. Four herbicides treated showed greater inhibition on roots than shoots, greater inhibition by herbicides was obtained for Italian ryegrass than for Radish. Nitralin, pendimethalin, and ethalfluralin at 0.01ppm gave about 20% inhibition of Italian ryegrass roots, whereas about 47% inhibition was obtained with napropamide. Fifty percent inhibition($I_{50}$) of roots and shoots of Italian ryegrass was 0.036 and 0.132ppm for nitralin. 0.063 and 0.097ppm for pendimethalin. 0.042 and 0.092ppm for ethalfluralin. 0.027 and 0.071ppm for napropamide respectively. On the other hand, $I_{50}$ of roots and shoots of Radish was 1.028 and over 10ppm for nitralin. 1.925 and 4.885ppm for pendimethalin, 2.669 and over 10ppm for ethalfluralin, and 0.515 and over 10ppm for napropamide respectively. There was positive correlation between the concentration of herbicides and growth inhibition of Italian ryegrass and radish.
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주요채소용 제초제의 토양중 잔효와 (殘效) 후작물에 미치는 영향 - 제4보 : 제초제 Nitralin 과 Napropamide 의 잔류량조사 -
양환승,문영희,최은석,장문수,이진하,장영남 ( H . S . Ryang,Y . H . Moon,E . S . Choi,M . S . Jang,J . H . Lee,Y . N . Chang ) 한국환경농학회 1991 한국환경농학회지 Vol.10 No.2
The soil residual amount of herbicides nitralin and napropamide was determined in 6 winter crops field using a chemical assay method. Chemical analysis on soil residue revealed that a relatively high amount of nitralin was detected between 150 and 200 days after treament(DAT). However, regardless of soil types the residue at 220 DAT ranged from 0.053 to 0.141ppm and from 0.134 to 0.308ppm, at the rate of 75 and 150 g a.i./10a, respectively. The residue of napropamide applied at the rate of 75 g a.i./l0a ranged from 0.006 to 0.072ppm at 150 DAT, but not detectable at 220 DAT. When application rate increased to 150 g a.i./10a, napropamide residue was between 0.005 and 0.16ppm at 150 DAT and less than 0.004ppm at 200 DAT, and was not detected at 220 DAT, irrespective of soil types. The results of chemical analysis for the two herbicides showed a similar trend to those obtained from the experiments in agar medium and fields.
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