정전 고속 미스트 엘리미네이터의 포집 효율 특성

김진선,김학준,한방우,우창규,김용진,이상린,문상철,Kim, Jin-seon,Kim, Hak-Joon,Han, Bangwoo,Woo, Chang Gyu,Kim, Yong-Jin,Lee, Sangrin,Moon, Sangchul 한국입자에어로졸학회 2018 Particle and Aerosol Research Vol.14 No.4

In this study, we developed a flat-plate type wet electrostatic precipitator that generates stable corona discharge compared to wire type discharge electrode. In order to compare the particle removal efficiency according to the shape of the discharge electrode such as the variation of the horizontal and vertical distance between spiked edges, and the variation of the height of discharge pin support were tested. As a result, when the horizontal distance between spiked edges was increased up to 36 mm, the vertical distance between spiked edges was increased up to 54 mm, and the height of the discharge pin support was increased up to 76 mm, the removal efficiency of PM10 was maintained at approximate 60.0%. Furthermore, the removal efficiency of particles over $5{\mu}m$ was about 80% or more. When the flow rate was 4 m/s, the gap between collection plates was 60 mm, and -14 kV was applied to the discharge electrode. The particle removal efficiency of the flat-plate type electrostatic precipitator was maintained when the horizontal and vertical distance between spiked edges, and the height of the discharge pin support was below a certain level. Those variables may be the important design factors for the shape of the discharge electrode. Therefore, when designing the electrostatic precipitator with multiple channels, the horizontal and vertical distance between spiked edges, and the height of discharge pin support must be selected in consideration of the weight of the discharge electrode and the processing cost.

Effect of Presurgical Nasoalveolar Molding in Unilateral Cleft Lip and Palate Infants

김진선,김영진,남순현,김현정,Kim, Jin-Sun,Kim, Young-Jin,Nam, Soon-Hyeun,Kim, Hyun-Jung Korean Academy of Pediatric Dentistry 2013 大韓小兒齒科學會誌 Vol.40 No.3

구순구개열은 얼굴에 발생하는 다양한 종류의 기형 중 빈번히 발생하는 기형으로, 발생 빈도는 일반적으로 1000명당 0.28~3.74명으로 알려져 있으나 파열의 종류, 인종 및 성별에 따라 큰 차이를 보인다. 구순구개열의 치료는 수술영역에서 많은 발전이 있었지만 수술만으로는 문제점을 해결하기는 어렵다. 파열부 간격을 줄이고 구순열 수술을 용이하게 하기 위한 술전 신생아 정형술의 개념이 1950년 McNeil에 의해 개발되었으며, 최근에는 술전 비치조 정형장치(presurgical nasoalveolar molding appliance, PNAM)를 사용하여 치조골뿐만 아니라 코의 모양을 정상화하려는 시도가 이루어지고 있다. 세 명의 환자가 편측성 구순구개열로 진단받은 후 술전비치조정형장치 장착을 위해 의뢰되었다. 레진과 교정용와이어를 이용하여 제작한 K-NAM 장치물을 입술 성형 수술을 시행하기 전까지 장착하였다. 첫 내원시와 nasal molding을 시행하여 입술 성형 수술을 하기 직전, 입술 성형 수술 이후 콧구멍의 높이, 너비, 비주의 각도를 측정하여 비교한 결과 세 증례에서 모두 코의 대칭성이 증가하며 술 후 심미개선에 효과적임을 알 수 있었다. K-NAM 장치물은 장치의 장착, 유지, 조절이 용이하고 장착한 상태에서 수유가 가능하기 때문에 장착시간을 증가시킬 수 있다. 따라서 nasal molding이 가능한 한정된 기간 안에 최대의 효과를 기대할 수 있다. 그리고 젖병을 빠는 행위가 가능해짐으로써 동시에 구강조직의 발달에도 도움을 줄 수 있을 것이라 생각한다. Cleft lip and palate, the most common craniofacial anomalies, are severe congenital defects that have an incidence of 0.28 to 3.74 per 1000 live births. Although there has been great improvement in the field of cleft surgery, surgical approach cannot be the single solution to resolve the various problems encountered in patients with cleft lip and palate. The concept of presurgical infant orthopedics (PSIO) for gradual closure of the cleft gap and simplified surgical performance was first introduced by McNeil in 1950. Recently, there are many attempts not only to approximate the alveolar segments but also to reshape the nasal cartilage. Three infants with unilateral cleft lip and palate were referred from the department of Plastic Surgery for presurgical nasoalveolar molding (PNAM). Maxillary appliances using resin with orthodontic wire were fabricated. Then these appliance was applied until patients underwent lip surgery. In all cases, the patients could wear the appliance all day since they were able to eat even with the appliance on, This resulted in significant improvements in the nasal symmetry were found. Our appliance, namely K-NAM, extends the wearing time within the limited period and as a result it is expected to maximize the treatment effects. Used properly, this appliance would play a major role in enhancing nasal symmetry with satisfactory results.

터보펌프용 전진익형 인듀서에 대한 연구

김진선,홍순삼,김진한,최창호,Kim, Jin-Sun,Hong, Soon-Sam,Kim, Jin-Han,Choi, Chang-Ho 한국유체기계학회 2006 한국유체기계학회 논문집 Vol.9 No.2

Computational and experimental studies on the forward-sweep inducer for the rocket-engine turbopump are presented in comparison with the conventional backward-sweep inducer. Computational results show that back flows at the inlet decrease in the case of forward-sweep inducers compared to the back-ward inducer. Moreover, the low pressure region at the back flow is decreased, which is presumed to improve the suction performance of the inducers. Experimental results show that the suction performance of the forward-sweep inducer is almost the same as that of the backward-sweep inducer although it has smaller inlet tip diameter and shorter length. The efficiency of the forward-type inducer is found better than that of the backward-sweep inducer due to the small size of back flows.

액체질소를 이용한 터보펌프 인듀서의 수력성능시험

김진선,홍순삼,김진한,Kim Jin-Sun,Hong Soon-Sam,Kim Jin-Han 한국유체기계학회 2006 한국유체기계학회 논문집 Vol.9 No.4

A cryogenic test facility has been developed to perform inducer and pump tests using liquid nitrogen. Performance tests of a turbopump in the maximum 50ton-thrust class can be performed with cryogenic fluid in the facility which operates at a temperature around -196oC with the rotational speed up to 30,000rpm To verify the reliability of the cryogenic pump test facility, hydraulic performance tests of an inducer were accomplished, and their results were compared with the result from a water test. The results confirm the reliability of the cryogenic test facility, and it is expected to contribute for on-going development of a turbopump for liquid rocket engines.

개별공조용 제어방식의 어제와 오늘

김진선,Kim, Jin-Seon 한국설비기술협회 1994 설비 : 공조ㆍ냉동ㆍ위생 Vol.11 No.5

고등각막표면굴절교정레이저절제술에서 근시교정량이 고위수차의 장기간 변화에 미치는 효과

김진선,이상범,Jin-Seon Kim,Sang-Bumm Lee 대한안과학회 2010 대한안과학회지 Vol.51 No.9

Purpose: To evaluate the effects of the amount of myopic correction on long-term changes in higher-order wavefront aberrations (HOAs) in advanced surface ablation-photorefractive keratectomy (ASA-PRK). Methods: The 193 eyes of 101 patients who underwent ASA-PRK were divided into two groups according to the amount of myopic correction by the median value (Group 1 ≤ -4.37D, 97 eyes, mean -3.26 ± 0.77D; Group 2 > -4.37D, 96 eyes, mean -5.77 ± 1.00D). Wavefront aberrometry was performed to measure total HOA, coma, trefoil, and spherical aberration preoperatively and at 1, 3, 6, 12, and 24 months after ASA-PRK. Statistical analysis was performed to compare changes in all HOAs between the two groups. Results: Each magnitude of total HOA, coma, and spherical aberration except trefoil significantly increased at 1, 3, 6, 12, and 24 months postoperatively in each group (p<0.05), and the increases were statistically significantly higher in group 2 compared to those of group 1 (p<0.05). The amount of changes in all HOAs except trefoil revealed that statistically significantly higher increases in group 2 compared to those of group 1 were determined only in the short-term period (up to 1 month, p<0.05), but not in the medium-term (1 to 6 months) or long-term periods (6 to 24 months). Conclusions: Postoperative total HOA, coma, and spherical aberration significantly increased in both groups, and these increases in surgery-induced HOAs were significantly higher in group 2 (> -4.37D). Increases in ASA-PRK-induced HOAs primarily originated from short-term changes in the postoperative one-month period and did not return to the preoperative level during the postoperative two-year period. J Korean Ophthalmol Soc 2010;51(9):1184-1195

다수 비예혼합 화염의 안정화 특성

김진선,이병준,Kim, Jin-Sun,Lee, Byeong-Jun 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.10

The stability of turbulent nonpremixed interacting flames is investigated in terms of nozzle configuration shapes and kind of fuels. Four nozzle arrangements - cross 5, matrix 8, matrix 9 and circle 8 nozzles - are used in the experiment. There are many parameters affecting flame stability in multi-nozzle flames such as nozzle separation distance, fuel flowrates and nozzle configuration etc. Key factors to enhance blowout limit are the nozzle configuration and the existence of center nozzle. Even nozzle exit velocity equal 204 m/s, flame is not extinguished when there is not a center nozzle and s/d=15.3∼27.6 in matrix-8 and circular-8 configurations. At these conditions, recirculation of burnt gas is related with stability augmentation. Fuel mole fraction measurements using laser induced fluorescence reveal lifted flame base is not located at the stoichiometric contour.

저온진입기 다발하는 돼지 호흡기 질병의 컨트롤 대책

김진선,Kim, Jin-Seon 대한양돈협회 2007 養豚 Vol.29 No.11

LCD-BLU용 외부전극형광램프의 광효율 측정과 결과분석

김진선,정희석,조광섭,Kim, Jin-Seon,Jeong, Hui-Seok,Jo, Gwang-Seop 한국정보디스플레이학회 2008 인포메이션 디스플레이 Vol.9 No.6

기계기구제조업의 근골격계질환예방 보건관리 사례

김진선,Kim, Jin-Seon 대한산업보건협회 2006 산업보건 Vol.220 No.-