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주광태,신진성,김동언,송정호,주승환,장홍근 한국비파괴검사학회 2002 한국비파괴검사학회지 Vol.22 No.5
국내 감마선투과검사용 조사장치는 1,000여대로 2,500여명의 종사자가 대부분 수동으로 원격 조작하는 실정으로 작업의 효율화와 방사선피폭 저감화를 위하여 자동 원격조작기의 사용이 요구된다. 이에 연구팀은 실무에 적합한 토크와 안전계수로부터 54kgf·㎝의 출력을 지닌 24V, 200W의 BLDC모터를 이용하여 0.4∼1.2 m/s 범위의 선원 이동속도를 조절할 수 있는 구동장치와 RF 센서로 구동 속도 조절, 광전센서에 의한 선원 위치 및 timer로 노출시간을 제어할 수 있는 무선 원격조작기를 개발하였다. 이와 같이 개발한 자동원격조작기는 AC와 DC 겸용, 그리고 기존의 수동 원격조작기에 탈착이 가능하여 자동과 수동을 겸용할 수 있는 경제적 이점 등으로 활용도가 클 것으로 기대된다. Recently, gamma radiographic equipments have been used about 1,000 sets manually and operated by about 2,500 persons in Korea. In order for a radiography to work effectively with avoiding any hazard of the high level radiation from the source, many field workers have expected developing a wireless automatic remote exposure controller. The KITCO research team has developed an automatic remote exposure controller that can regulate the speed of 0.4∼1.2 m/s by BLDC motor of 24V 200W which has output of 54 kgf·㎝, suitable torque and safety factor for the work. And the developed automatic remote exposure controller can control rpm of motor, pigtail position by photo-sensor and exposure time by timer to RF sensor. Thus, the developed equipment is expected that the unit can be used in many practical applications with benefits in economical advantage to combine the use of both automatic and manual type because attachment is possible existent manual remote exposure controller, AC and DC combined use.
Well-Aligned Carbon Nanotubes Grown on Glass at about 400℃
Yoon, H. J.,Kang, H. S.,Shin, J. S.,Kim, J. S.,Son, K. J.,Lee, C. H.,Kim, C. O.,Hong, J. P. 漢陽大學校 自然科學硏究所 2001 自然科學論文集 Vol.21 No.-
PECVD를 이용해서 코닝 글래스와 실리콘 기판 위에 탄소 나노튜브를 성장하였다. 외부sus-grid 넣어 줌으로써 성장 동안에 반응 가스 밀도를 증가 시켰다. 이 grid가 실험을 통해 낮은 온도에서 탄소 나노튜브가 성장되는 중요한 요인임을 발견하였다. Ni이 증착된 기판을 400℃에서 암모니아 가스로 선처리 해준후 아세틸렌과 수소가스를 혼합하여 성장 시켰다. 5분의 성장기간 동안 30∼60㎚의 직경과 2∼4㎛길이의 탄소 나노튜브를 얻었다. 400℃에서 글래서위에 2㎛ 길이의 탄소 나노튜브가 성장 하였다. Well-aligned multi-wall carbon nanotubes have been grown on both Coming glass and silicon substrates at about 400℃ by a modified plasma-enhanced chemical vapor deposition system. External SUS-grid was inserted to relatively increase reactive radical density during the growth. This grid was found to be the key parameter for low temperature deposition of carbon nanotubes in our case. The Ni-coated substrates were at first pretreated by an ammonia gas at 400℃, and then followed by the deposition with the mixture of acetylene and hydrogen gases. Carbon nanotube was about 2~4㎛ in length and 30~60㎚ in diameter for 5 min deposition time. Carbon nanotube with short length of about 2um was well aligned on the glass substrates at 400℃.
Aerobic and Anaerobic Bacterial Infection of the Maxillary Sinus
김종남,민양기,신진성,오승하,유원석 대한비과학회 1994 Journal of rhinology Vol.1 No.2
To identify the bacterisal spectrum in the recent paranasal sinusitis, the bacterial findings in 112 conseutive patients who underwent endoscopic siuns surgery were studied. Asepic collec- tion of the sinus mucosa from one of the maxillary sinuses was made under local anesthesia. All samples were cultured for both aerobes and anaerobes. At least one type of organism was isolated in 103 patienis(92.0%), and no bacterial growth could be obtained in the remaining 9 patients(8.0%) even after 2 weeks of cultivation. Aerobic organisms were isolated in 82 patients, either alone(61), or mixed with other aerobes (18) or anaerobes(3). Anaerobes were isolated in 24 sinuses. either alone (15). or mixed with other aerobe(3) and anaerobe(6). Of 101 aecobic isolates, the predominant ones were 30 strains of coagulase-negative Stapylococci, 22 Streptococcus viridans, and 9 Staphylococcus aureus. Of 30 anaerobic isolates, the predominant ones were 8 strains of Peptostreptococci. 7 Bacterodes species, and 7 unidentifiable bacteria that exhibited strict anaerobic growth. Analyzing our data along with previous domestic reports. we could identify increasing isolation of coagulase-negative Staphylococci, Streptococci, and anaerobcs, and dccraesing isolation of Streptocoocus pneumoniae and H influenzae.