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주영철,한충환,엄태준,이상욱,김국원,Joo, Young-Cheol,Han, Choong-Hwan,Um, Tai-Joon,Lee, Sang-Wook,Kim, Kug-Weon 한국반도체디스플레이기술학회 2007 반도체디스플레이기술학회지 Vol.6 No.4
Temperature distribution of the circular heat source was studied by analyzing the heat transfer of the environment of the circular source for OLED. Circular nozzle source was used to fabricate thin organic layer as the organic material in it was heated, vaporized and deposited to the large size panel. A modified heater structure of circular source has been suggested. The results of numerical analysis shows that the modified heater structure can use 15% more powder in a batch than the original heater structure does. Moreover, the modified heater structure can improve the uniformity of organic vapor deposition by controlling the temperature.
척추 전장 측면 방사선검사 시 손바닥 정면 자세가 척추골반지표에 미치는 영향
주영철,김한용,김동환,Joo, Young-Cheol,Kim, Han-Yong,Kim, Dong-Hwan 대한방사선과학회 2022 방사선기술과학 Vol.45 No.5
The purpose of this study was to investigate the effect of cross arms and palms facing forward on spinopelvic parameters during the whole spine lateral radiography. In addition, we would like to present the usefulness of a posture with the palm facing forward during whole spine lateral radiography of the spine using EOS. The subjects of this study were images of a total of 50 patients (18 males, 32 females) who whole spine lateral radiography using the conventional method and the EOS method from October 2020 to March 2021. The posture used in this study was set as 'CAP' for cross arms and 'PUSH' for posture with palms facing forward. In this study, among the spinal stability factors, thoracic kyphosis (thoracic vertebrae 4 to 12), lumbar lordosis (lumbar vertebrae 1 to sacrum 1), sagittal vertical axis, sacral slope, and shoulder flexion angle were compared on average. The mean thoracic kyphosis was 34.52±12.46° for CAP and 28.46±10.81° for PUSH (p<0.01). The lumbar lordosis of CAP was 42.45±17.45°and that of PUSH was 40.56±16.14°(p>0.57). The sagittal vertical axis was 26.59±34.34 mm in CAP and 21.21±35.41 mm in PUSH (p>0.44). In CAP, the sacral slope was 30.96±10.29°, and in PUSH, it was 31.01±10.19° (p>0.98). shoulder flexion angle was 38.31±8.24° for CAP and 26,08±6.71° for PUSH(p<0.01). As a result of this study, the PUSH posture is considered to be a posture that can minimize the shoulder flexion angle and can perform a stable examination while minimizing changes in spino-pelvic parameter.
한국인 임산부의 흉부 후-전 방향 방사선검사 시 적절한 차폐막 높이
주영철(Young-Cheol Joo),김규형(Gyoo-Hyung Kim) 대한방사선과학회(구 대한방사선기술학회) 2018 방사선기술과학 Vol.41 No.2
The purpose of this study is to provide the basic data for reducing unnecessary radiation dose to the abdomen and fetus of pregnant women by presenting proper height of shielding protector for efficient abdominal shielding in chest PA examination of Korean pregnant women. The subjects of this study were 288 persons who were eligible for this study among 798 pregnant women who had chest PA examination from January 1, 2015 to December 31, 2016 Retrospective study was performed. Measurements was performed from the apex of the right and left lungs to costophrenic angle of the right and left lungs and to the lowest costophrenic angle among the right and left lungs at the top of the image(this line called Joo s line in this study). The mean of the right and left lung height of pregnant women were 259.09 ㎜ and 263.57 ㎜, respectively. Also, the average height of the Joo s line designed by the researcher for proper abdominal radia-tion protection was 322.15 ㎜. For proper and efficient abdominal radiation protection for pregnant women, it is necessary to adjust the shielding according to the height of the pregnant woman. It is appropriate that the height of the shielding protector should be adjusted so that the upper part of the shield is located at 342.30 ㎜ below from upper part of the detector.
주영철(Youngcheol Joo),한충환(Choong Hwan Han),엄태준(Tai Joon Um),이상욱(Sang-Wook Lee),김국원(Kug Weon Kim),권계시(Kye-Si Kwon) 제어로봇시스템학회 2008 제어·로봇·시스템학회 논문지 Vol.14 No.6
Organic light emitting diode(OLED) is one of the most promising type of future flat panel display. A linear source is used to deposite organic vapor to a large size OLEO substrate. An electric heater which is attached on the side of linear source heats the organic powder for the sublimation. The nozzle of heater, which is attached at the top of the linear source has an optimal temperature. An numerical analysis has been performed to find optimal heater position for the optimal nozzle temperature. A commercial CFD program, FLUENT, is used on the analysis. Two-dimensional and three-dimensional analysis have been performed. The analysis showed that the heater should be attached at the outer side of crucible wall rather than inner side of housing, which was original design. Eighteen milimeter from the top of the linear source was suggested as the optimal position of heater. Improving thermal performance of linear source not only helps the uniformity of organic vapor deposition on the substrate but also increase productibity of vapor deposition process.
수술중 감염방지를 위한 공조시스템의 개선방안에 대한 연구
주영철(Joo Youngcheol),김천숙(Kim Chun-Sook),권순정(Kwon Soonjung) 한국산학기술학회 2004 한국산학기술학회논문지 Vol.5 No.6
수술중 감염방지를 위해 수술실의 공조시스템의 개선방안에 대한 연구를 수행하였다. 대학병원들의 수술실과 공조 시스템을 조사하였다. 수술실 내부의 여러 부위에서 공기 샘플을 채취하여 세균을 배양함으로써 수술실내 세균의 분포를 측정하였다. 수술실 단면을 2차원 모델화 하여 공기의 유통을 전산유체해석하였다. 준공한지 오래된 병원의 수술실은 공조시스템이 정화된 신선한 공기를 수술이 진행되는 부위에 효과적으로 공급하지 못하는 것으로 판단되어졌다. 시설비의 큰 증가 없이 환자의 수술부위에 효율적으로 신선한 공기를 공급할 수 있는 시스템을 제안하였다. The air ventilation system of operation rooms has been studied for the prevention of cross infection during the operation. Operation rooms and air ventilation systems of three University hospitals are investigated. The distribution of microbe is measured by cultivating air samples in the operation room. A two-dimensional model for the cross-section of an operation room is developed. for the CFD analysis. The characteristics of air flow inoperation room are calculated by using a CFD program. The current air ventilation system of an old hospital does not deliver the clean air to the operation area efficiently. A new air ventilation method which improves air venting with little increase of the cost of equipment is suggested.
주영철(Joo Youngcheol),임준형(Im, Jun-Hyoung) 한국산학기술학회 2005 한국산학기술학회논문지 Vol.6 No.4
대기중의 일산화탄소 가스 농도를 측정하기 위한 마이크로 가스센서들 MEMS 공정을 이용하여 제작하였다. SnO₂ 가스 감응물질을 작동온도까지 가열하기 위하여 마이크로 히터를 설치하였다. 마이크로 히터에서 발생한 열이 효율적으로 감응물질에만 전달되고 실리콘 베이스로 누설되는 것을 최소화하기 위하여 마이크로 히터와 전극을 레버 형으로 만들어 다리처럼 공중에 뜨게 하였으며, 이 위에 감응물질을 올려놓았다. 마이크로 가스센서의 열전달 현상을 상용 열유동 해석 전용 프로그램인 FLUENT를 이용하여 해석하였다. 해석 결과 실리콘 웨이퍼 베이스의 온도가 거의 상온에 가까워 마이크로 히터에서 발생한 열이 가스 감응물질을 효과적으로 가열하여서 가스 감응물질의 열적 고립 상태를 유지하고 있는 것을 알 수 있었다. 또한 감응물질을 작동온도까지 가열하기 위하여 마이크로 히터에 가하여야 하는 전류의 양을 예측할 수 있었다. A lever type CO micro gas sensor was fabricated by MEMS technology. In order to heat up the gas sensing material, SnO₂, to a target temperature, a micro heater was built on the gas sensor. The heater and electrodes were hanged on the air as a bridge type to minimize the heat loss to the silicon base. The sensing material laid on the heater and electrodes and did not contact with the silicons base. The temperature distribution of micro gas sensor was analyzed by a CFD program, FLUENT. The results showed that the temperature of silicon wafer base was almost similar to that of the room temperature, which indicates that the heat generated at the micro heater heated up effectively the sensing material. The required electric current of micro heater to heat up the sensing material to the target temperature could be predicted.
주영철(Joo Young-Cheol),김승혁(Kim Sheung-Hyuk) 대한방사선과학회(구 대한방사선기술학회) 2020 방사선기술과학 Vol.43 No.3
The purpose of this study is to investigate the effect of posture changes(Anteroposterior projection, Posteroanterior projection) in the plain abdominal examination on breast dose and to examine its clinical usefulness. This study was used a human body phantom and a glass dosimeter. Glass dosimeters were directly inserted from the center and outside of medial and lateral. In this study, the deep dose was measured in the right breast and the surface dose in the left breast. During the abdominal examination, the central X-ray incident point was perpendicularly incident to the image receptor 5 cm above the iliac crest. The exposure parameters were 82 ㎸p, 320 ㎃, 50 ㎳, x-ray field size 14×17 inch The distance between the center X-ray and the detector was fixed at 110 cm, and only the top two AEC chambers were used. As a result of this study, the medial and lateral side doses of the right breast were 535.73±30.68 μ㏉ and 414.46±33.52 μ㏉ for erect AP, and 145.80±18.52 μ㏉ and 148.76±12.92 μ㏉ in erect PA. The superficial breast dose was 754.00±68.36 μ㏉ on the medial side and 674.06±45.58 μ㏉ on the lateral side in the erect AP, 70.66±7.98 μ㏉ on the medial side, and 86.46±15.35 μ㏉ on the lateral side in the erect PA. There was a statistically significant difference in the difference between the mean values of the medial and lateral side doses in the deep and superficial areas of the breast according to the postural change (p <0.01). As a result of this study, If the abdominal radiography was examined in the PA position, the dose reduction effect was 72.78% on the medial side, 64.10% on the lateral side of the deep breast, 90.62% on the medial side, and 87.17% on the lateral side of the superficial breast compared to the AP position.