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고태준,현성욱 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.4
The possibility of operating dilute-magnetic-semiconductor-based nanoelectromechanical systems inspintronics applications isdiscussed. Here, the resonant frequencies and the dynamic ranges of nanoelectromechanical systems based on several Mn-doped dilute magnetic semiconductors are considered and compared with those of semiconductor-based nanoelectromechanical systems. The analysis shows that the resonant frequencies and the dynamic ranges are comparable to those of semiconductor-based nanoelectromechanical systems. Among the materials considered here, GaMnN is expected to be the most promising due to its high resonant frequency and dynamic range. The study presented here will open the possibility of future integration of dilute-magnetic- semiconductor-based nanoelectromechanical systems into spintronics devices.
택코트의 PG등급에 따른 아스팔트 혼합물에서의 접착강도 특성 평가
고태준,임치수,장대성,이재준 한국도로학회 2024 한국도로학회 학술대회 발표논문 초록집 Vol.2024 No.03
택코트란 아스팔트 포장 공사 시 기존 아스팔트층과 신설 아스팔트 층 사이에 부착성을 증가시키기 위하여 사용되는 재료이다. 교통 하중으로 인해 포장 경계면에서 수평전단응력 및 수직인장응력이 발생하게 되는데 택코트의 유실, 양생 부족 등의 문제로 접착 성능 이 부족하면 포장층의 분리, 밀림과 같은 도로 파괴가 형상이 나타날 수 있다. 현재 국내에서는 국토교통부 아스팔트 콘크리트 포장 시공 지침에 택코트 살포량에 대한 기준은 존재하지만 기존 및 신설 아스팔트 포장층 사이에 택코트의 접착강도에 대한 기준은 존재 하지 않는 실정이다, 이는 접착강도 특성이 분석되지 않은 택코트를 사용함에 따라 아스팔트 포장의 공용성 측면에서 문제를 초래할 수 있다. 따라서 본 연구에서는 PG등급이 다른 택코트 4종류에 대한 인장 및 전단접착강도를 확인하기 위하여 인장접착강도 시험, 전 단접착강도 시험을 진행하였다. 택코트의 양생정도에 따른 접착강도 특성을 확인해보기 위하여 택코트의 수분이 증발됨에 따라 중량 변화가 없는 상태를 양생 100%로 하여 양생 0%, 50%, 100%로 진행하였으며, 살포량은 국토교통부 아스팔트 콘크리트 시공 지침에 따 라 0.5ℓ/m2로 진행하였다. 사용된 택코트 종류에 관계 없이 양생 정도가 증가함에 따라 접착강도는 증가하는 추세를 보였으며, 인장 및 전단접착강도 시험에 관계없이 초기 양생(양생 0%~50%)보다 양생 50% 이후에서의 더 높게 강도가 발현된 것을 확인하였다. 또한 PG등급이 높은 택코트가 인장 및 전단접착강도에 관계없이 접착강도 성능이 우수한 것을 확인할 수 있었다. 추후 택코트의 종류를 추 가하여 PG등급이 분류가 이루어진 후에 접착강도 시험을 진행하여 결과를 확인할 예정이다.
高太濬,李相龍 대전대학교 韓醫學연구소 2000 한의학연구소 논문집 Vol.8 No.2
Through the study about Che-Qi-Jung(諸氣證) concerned with phenomenon of stress, we concluded as fallow. 1. Stressors are recognized three parts, internal cause, external cause, non-interexternal cause, in the oriental medicine. And the reaction of the body about stressors, was expressed change of Qi(氣). 2. The vascular system and autonomic nervous system are tensed or relexed. Because the etiology of Yuk--Em(六淫), Chil-Jeong(七情) make lose up and down, in and out, circulation of Gi(氣). The symtom caused with stress are explained, divided into Chil-Qi(七氣), Gu-Qi(九氣), Joong-Qi(中氣), Qi-Tong(氣痛), Qi-Yuk(氣逆), Qi-Wool(氣鬱). 3. The svmtom of Chil-Qi is recognized into psycholoQical stress and Mae-Haek-Qi(梅核氣). The symtom of Gu-Qi is composed of Chil-Qi and Han(寒), Youl(熱), Ro(勞). 4. The symtoms of Qi-Yuk and Joong-Qi are caused by the ascent of Hwa-Qi(火氣). And Hwa-Qi is made by rage and depression. Qi-Yuk is chronic symtom that the ascent of Hwa-Qi is made by out of function in up and down mechanism of Qi. Joong-Qi is acute symtom that patholoQical state of Qi-Yuk take place for a while by sudden psycholoQical shock 5. The symtom of Qi-Wool is loss of funtion made by depressed state in physioloQical mechanism, and Qi-Wool is observed in depressive psychosis and hypochondriasis and psychogenic. 6. The symtom of Qi-Tong is the pain caused by interference of circulation of Qi-Hyul(氣血). PsycholoQical stimulation such as rage and depression, tense autonomic nervous system. This make convulsion in gastro-intestine or vascular circuluation or abdominal muscles, and the pain is caused by convulsion.
Improved Linear Air-track Experiment with a Photo-interrupter Array
고태준,장지훈 한국물리학회 2013 새물리 Vol.63 No.4
The linear air-track experiment system has been modified with an array of 256 photo-interrupters attached on the sides of the air track to follow the positions of the gliders in motion. The triggered signal from the array is used to locate the positions of the gliders on the track, and timing information is acquired from the system clock of the computer. Based on the measured values of the positions and the time, we were able to analyze the motion of the gliders on the track. Furthermore, with this modified experimental setup, we performed an elastic collision experiment on two gliders and verified conservations of momentum and energy. When compared to those from the conventional two-photo-gates setup, our experimental results show that the photo-interrupter array technique can provide much more accurate real-time determinations of the positions and the time of gliders in motion. The improved linear air-track system utilizing the photo-interrupter array will be highly beneficial in introductory physics laboratory courses.
나노구조 박막의 Morphology에 따른 초전도 특성 변화에 관한 연구
고태준(Taejoon Kouh) 한국자기학회 2006 韓國磁氣學會誌 Vol.16 No.1
Transport and tunneling measurements of nanostructured superconducting thin films are presented. To understand the effects of film morphology on their superconducting properties, thermal annealing experiments have been performed. The transition temperature increases with thermal annealing temperature towards the bulk value. Also, thermal annealing results in a shift of transverse phonon mode. These can be understood with changes in film morphology and suggest its importance on the superconducting state properties.
Annealing에 의한 나노구조 박막의 전기적 특성 연구
고태준(Taejoon Kouh) 한국자기학회 2006 韓國磁氣學會誌 Vol.16 No.1
Electron transport properties of nanostructured Pb thin film, consisting of grains, have been studied. Nanostructured thin films were fabricated on a substrate held at low temperature and their thicknesses were less than 10 ㎚. While temperature of the film increased from 1.3 K to room temperature, the change in normal state sheet resistance has been measured. As the annealing temperature varies, the normal state sheet resistance shows a non-monotonic and irreversible change. Such behavior can be understood with the Pb grain growth due to annealing of the film.