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송주한,이상신,Song, Ju-Han,Lee, Sang-Shin 한국광학회 2006 한국광학회지 Vol.17 No.4
본 논문에서는 마이크로 미러 진동판을 이용한 광마이크로폰을 제안하고 구현하였다. 이 미러 진동판은 실리콘 바(bar)에 의해 프레임에 연결되어 있어서 인가된 음압에 따라 전후로 움직이게 되어 있으며, 작고 간단한 구조의 광 헤드는 한 개의 다중모드 광섬유로 되어 있다. 본 논문에서는 광헤드와 진동판 사이의 거리를 변화시켜 가면서 응답특성을 측정하여 선형성과 민감도가 최대인 지점을 동작점으로 결정하였다. 그리고 음성신호의 주파수를 변화시켜 가면서 구현된 소자의 출력을 측정하였다. 측정된 광마이크로폰의 주파수 대역폭은 약 $\sim$2dB 출력 변화 이내에서 약 2 kHz였다. An optical microphone incorporating a reflective diaphragm and a fiber-optic head was demonstrated. The diaphragm was made of a micromirror membrane which is suspended by a silicon bar connected to a frame, allowing fer a displacement induced by acoustic waves. A compact, simple optical head was implemented by exploiting a single multimode fiber. For the assembled microphone, the static characteristics were investigated to find the operation point defined as the optimum distance between the head and the diaphragm, and a flat frequency response with a variation of $\sim$2dB for the range of up to 2 kHz was accomplished.
튜브 프레팅마멸 연구를 위한 접촉부 미끄럼 거동의 실험적 분석
송주선(Ju-Sun Song),김형규(Hyung-Kyu Kim),이영호(Young-Ho Lee),김재훈(Jae-Hoon Kim) 한국트라이볼로지학회 2004 한국트라이볼로지학회 학술대회 Vol.38 No.-
To study the fretting wear problem of a nuclear fuel, the behaviour of slip displacement at the contact is investigated in this paper. The slip displacement was evaluated from the vibration amplitudes measured during a fretting wear experiment in real time basis. The experiment was conducted in air at room temperature and one span of a fuel assembly was simulated. The contact condition between the grids and rods varied as the normal force of 5 N and gap of 0.2 ㎜. The fuel rod was vibrated with the frequency of 30 ㎐ and the center oscillation of 0.7 ㎜. Simple geometrical equations were used for the axial and transverse slip displacement. The trace of rod movement was investigated, which was affected by the contact condition. The vibration characteristic was not altered during the experiment when a specific contact condition was applied. The severest wear on the rod occurred in the case of axial slip and gap existence. It implies that the mechanism of impact wear should be understood for studying the fuel fretting problem.
송주선(Ju-Sun Song),김형규(Hyung-Kyu Kim),이영호(Young-Ho Lee),김재훈(Jae-Hoon Kim) 한국트라이볼로지학회 2004 한국트라이볼로지학회 학술대회 Vol.39 No.-
In this paper, fretting wear tests were conducted in air at room temperature (RT) and in water at high temperature and high pressure (HTHP) environment to analyze the wear characteristic. As for the supporting condition between the tube and spring/dimple, the gap of 0.2 ㎜ in air at RT and the normal force of 10 N and the slip of 50 μ m in water at HTHP were applied. Four different shapes of spring/dimple specimen (type A, B, C, D) were used. Detail eaxamination of wear scar was also performed using SEM micrographs. As a result, in the case of the spring of truncated wedge, severer wear occurs than the others. Protrusion part was found and larger in air at RT. It is thought that the difference in the wear volume and the protrusion is caused by the different wear mechanism corresponding to the different environment.
기계환기폐렴의 원인균 진단에서 인공기도 흡인액을 이용한 Multiplex PCR과 세균배양 결과의 비교
송주한 ( Ju Han Song ),명순철 ( Soon Chul Myung ),최송호 ( Song Ho Choi ),전은주 ( Eun Ju Jeon ),강형구 ( Hyung Gu Kang ),이혜민 ( Hye Min Lee ),조성근 ( Sung Keun Cho ),최재철 ( Jae Chol Choi ),신종욱 ( Jong Wook Shin ),박인원 ( 대한결핵 및 호흡기학회 2008 Tuberculosis and Respiratory Diseases Vol.64 No.3
연구배경: 기계환기폐렴의 원인균을 조기에 진단하면 이 질환의 예후를 개선할 수 있다. 본 연구에서는 기관내튜브 흡인액을 이용하여 기계환기폐렴의 주된 원인균인 녹농균, 폐렴막대균 그리고 메치실린내성 포도알균에 대한 multiplex PCR법을 시행하여 기계환기폐렴의 원인균을 조기에 진단할 수 있는지 살펴보았다. 방법: 기계환기폐렴으로 진단된 환자에서 24시간 이내에 기관내튜브 흡인액을 채취하여 -20°C 냉동실에 보관하였고, 추후에 multiplex PCR을 시행하였다. Forward & reverse primer는 각각의 원인균에 특이한 부위에 맞춰서 제작하였다(녹농균의 oprL gene, 폐렴막대균의 16S rRNA, 메치실린내성 포도알균의 mec gene). 기관내튜브흡인액의 배양검사를 포함한 기계환기폐렴 환자의 임상적 및 검사실 소견을 함께 분석하였다. 결과: 총 24명(남자 18명, 여자 6명)의 기계환기폐렴 환자가 연구에 포함되었다. 나이(평균±표준편차)는 70±11세였다. 모든 환자는 기저질환을 가지고 있었다. 기관내튜브 흡인액의 배양에서 11명에서 원인균이 검출되었다(녹농균 2예, 폐렴막대균 1예, 메치실린내성 포도알 균 2예, 기타 그람음성간균 3예, 폐렴알균 2예, 복합감염 1예). 녹농균에 대한 multiplex PCR은 3예에서 양성이 나왔으며, 2예가 배양결과와 일치하였다. 폐렴막대균에 대해서는 4예에서 양성이었으며, 1예가 배양결과와 일치하였다. 메치실린내성 포도알균은 2예에서 양성이었으나, 모두 배양결과와 일치하지 않았다. 기계환기폐렴의 예후는 적절한 항생제의 사용 여부와 폐렴 발생 당시의 APACHE III score에 영향을 받았다. 결론: 기관내튜브 흡인액을 이용한 multiplex PCR법은 기계환기폐렴에서 그람음성균의 진단에는 가능성을 보였으나, 향후 실제 유용성에 대해서는 추가 연구가 필요 할 것으로 사료된다. Background: Early identification of pathogens can improve the prognosis of patients with ventilator associated pneumonia (VAP). In the present study, we evaluated the feasibility of performing multiplex PCR for endotracheal aspirates to detect three important pathogens (P. aeruginosa, K. pneumoniae and MRSA) in patients with VAP. Methods: The endotracheal aspirates of 24 patients were collected within 24 hours of the diagnosis of VAP for performing multiplex PCR. Forward and reverse primers were designed to target the specific site of each pathogen (the oprL gene for P. aeruginosa, 16S rRNA for K. pneumoniae and the mec gene for MRSA). We analyzed the clinical data of the VAP patients, including the culture reports for the endotracheal aspirates. Results: Twenty-four patients (M:F=18:6, mean age=70±11) with VAP were enrolled. Pathogens were isolated from 11 patients (P. aeruginosa in 2, K. pneumoniae in 1, MRSA in 2, other enteric Gram negative bacilli in 3, S. pneumoniae in 2 and mixed infection in 1). Multiplex PCR detected three cases of P.aeruginosa (2 cases coincided with the culture reports) and four cases of K. pneumoniae (1 matched with the culture report). PCR detected two MRSA cases, which did not coincide with the culture reports. Conclusion: Multiplex PCR of the endotracheal aspirate showed some ability to detect Gram negative bacilli, although caution is required when interpreting the results. (Tuberc Respir Dis 2008;64:194-199)
송주선(Ju-Sun Song),김형규(Hyung-Kyu Kim),이영호(Young-Ho Lee),김재훈(Jae-Hoon Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Slip displacement is brought into focus to study the tube fretting wear that occurs on the contact by the springs. An oscillating tube was in contact with plate support springs. The contact condition was varied as normal force 5 N, and gaps of 0.1 and 0.2 ㎜ in the experiment. The oscillation range of the tube was also varied as 0.2, 0.3, 0.4 and 0.7 ㎜. Formulas for predicting the slip displacement range were derived in terms of the vibration amplitudes measured during the tube oscillation. It was found that the slip displacement in transverse direction was much higher (720~33000 times) than that in axial one. This resulted in the severer wear on the contact suffered from transverse slip.