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윤석진(Suk Jin Yoon),박종규(Jong Kyu Park),이기동(Gi Dong Lee),서오석(Oh Suk Seo),김헌영(Heon Young Kim) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
Press quenching process is an advanced metal forming method for manufacturing automotive parts with high strength and minimum spring back. In this process, the cooling time and conditions is the most important parameters. This study investigates the thermal deformation and mechanical properties of tubular beam with press quenching process. In order to compare with experimental result, a finite element analysis of the press quenching process coupled with phase transformation and heat transfer.
김학섭,윤석진,손상모,정철,이상윤,Kim, Hak-Sub,Yoon, Suk-Jin,Sohn, Sangmo Tony,Chung, Chul,Lee, Sangyoon 한국천문학회 2012 天文學會報 Vol.37 No.2
We present wide-field multiband photometry of globular cluster (GC) systems toward the central region of the Fornax cluster of galaxies, including NGC 1399, NGC 1404, and NGC 1387. Observation was carried out through four optical passbands (U, B, V, and I) with the Mosaic II CCD imager mounted on the 4-m Blanco telescope at Cerro Tololo Inter-American Observatory (CTIO). This marks one of the widest U-band photometric studies on GC systems. GC candidates are selected among point sources based on their two color diagrams together with a magnitude cut. We investigate the radial variation of color distributions for the GC systems, focusing on the fundamental parameters that characterize bimodal distributions; the number ratio between blue and red GCs, the mean colors of the groups, and their color dispersions. We discuss the implication of our result regarding the origin of GC color bimodality.
보론강 튜브 Hot Press Forming시 두께 변화에 따른 냉각 채널 설계
서오석(Oh Suk Seo),이은국(Eun Guk Lee),김헌영(Heon Young Kim),윤석진(Suk Jin Yoon) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
Ultra high strength products can be manufactured by the hot press forming process of Boron steel. The hot press forming should be accompanied by quenching process in order to ensure high strength. In the quenching process, cooling rate is key factor to get the high strength, which is closely related to the design of cooling system such as the diameter, the position and the arrangement of the cooling channels. In this study the quenching process including phase transformation was analyzed to obtain the optimized cooling channel according to the thickness variation of the boron tube.
만성폐쇄성폐질환자에서 질병 중증도 및 삶의 질을 비롯한 사회적 요인과 호흡곤란과의 관계
김은진 ( Eun Jin Kim ),박재형 ( Jae Hyung Park ),윤석진 ( Suk Jin Yoon ),이승준 ( Seung Jun Lee ),차승익 ( Seung Ick Cha ),박재용 ( Jae Yong Park ),정태훈 ( Tae Hoon Jung ),김창호 ( Chang Ho Kim ) 대한결핵 및 호흡기학회 2006 Tuberculosis and Respiratory Diseases Vol.60 No.4
연구배경: 만성폐쇄성폐질환은 질병의 중증도를 추정 정상치에 대한 FEV1의 백분율을 기준으로 분류해 왔다. 그러나, 같은 폐기능 검사소견을 보이는 환자들 사이에서도 환자가 느끼는 주관적 호흡곤란에는 차이가 있다. 본 연구에서는 호흡곤란이 FEV1를 비롯하여, 건강관련 삶의 질, 주변으로부터 받는 도움의 정도, 직업 등에 영향을 받는지에 대해 알아보고자 하였다. 방법: 2002년 6월부터 2004년 5월까지 경북대학교병원 호흡기 내과에서 만성폐쇄성폐질환으로 추적관찰 중이며, 임상적으로 안정되어 있고 비가역적인 폐쇄성 폐기능 장애를 가진 환자 36명을 대상으로 하였다. 만성 폐쇄성 폐질환의 병기는, GOLD 병기를 따랐으며, 호흡곤란 척도는 MRC 호흡곤란 척도를 사용하였다. 건강 관련 삶의 질은 한국어 St. Goerge`s respiratory questionnaire(SGRQ)를 사용하였다. 결과: 환자들의 평균 FEV1은 추정 정상치의 32.0%였다. GOLD 병기와 호흡곤란 정도사이에 유의한 상관관계는 없었다(p=0.114). 호흡곤란이 심할수록 SGRQ 값의 증상(symptom)(p=0.041), 활동력 (activity)(p=0.004), 영향력(impact)(p=0.001), 총점(total)(p<0.001) 수치 모두에서 의미있게 높은 수치를 보였다. 호흡곤란 정도와 직업간에 의미있는 상관관계는 없었으며(p=0.259), 호흡곤란이 심할수록 환자가 주변으로부터 받는 도움 정도는 적다고 느끼는 상관관계가 뚜렷하였다(p=0.011). 결론: 만성폐쇄성폐질환자의 진료에서 환자가 느끼는 주관적인 호흡곤란은 FEV1에 따른 병기 외에도 건강관련 삶의 질 및 주변의 지지 정도와 더 연관성을 가질 수 있다는 점이 고려되어야 할 것으로 사료된다. Background: Chronic obstructive pulmonary disease(COPD) is categorized by the percentage of the predicted FEV1(Forced expiratory volume in 1 second) result which is highly correlated with disease severity(morbidity and mortality). In COPD patients, dyspnea seems to be different from disease severity. We investigated whether dyspnea is correlated with disease severity, as measured by FEV1, quality of life(QoL), occupation, and supporting level of family members and neighbors. Method: Thirty-six clinically stable patients with chronically irreversible airflow limitation were enrolled. We used the Medical Research Council(MRC) dyspnea scale to assess the level of dyspnea and the Korean St. Goerge`s respiratory questionnaire(SGRQ) as measure the QoL. Result: The mean percentage of the predicted FEV1 was 32.0%. Dyspnea was not correlated with GOLD stage using FEV1(p=0.114). With deteriorating level of dyspnea the scores of symptoms(p=0.041), activity(p=0.004), impact(p=0.001), and total SGRQ score(p<0.001) were significantly increased. Dyspnea was not correlated with the level of occupation(p=0.259). The supporting level of family members and neighbors was significantly negatively correlated with dyspnea scale(p=0.011). Conclusion: In the management of COPD patients, we have to remember that the level of subjective dyspnea is correlated with QoL(symptom, activity and impact on society) and social supporting level as well as GOLD stage(FEV1). (Tuberc Respir Dis 2006; 60: 397-403)
기판 부근의 자기장이 RF 스퍼터링법으로 증착된 ITO 박막의 특성에 미치는 영향
김현수,장호원,강종윤,김진상,윤석진,김창교,Kim, Hyun-Soo,Jang, Ho-Won,Kang, Jong-Yoon,Kim, Jin-Sang,Yoon, Suk-Jin,Kim, Chang-Kyo 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.7
Indium tin oxide (ITO) films were prepared using radio frequency (RF) magnetron sputtering method, magnets were equipped near the target in the sputter to bring the plasma near the target. The effect of magnetic field that brings the plasma near the substrate was compared with that of substrate heating. The effect of substrate heating on the grain size of the ITO thin film was larger than that of the magnetic field. However, the grain size of the ITO thin film was larger when the magnetic field was applied near the substrate during the sputtering process than when the substrate was not heated and the magnetic field was not applied. If stronger magnetic field is applied near the substrate during sputtering, it can be expected that the ITO thin film with good electrical conductivity and high transparency is obtained at low substrate temperature. When magnetic field of 90 Gauss was applied near the substrate during sputtering, the mobility of the ITO thin film increased from 15.2 $cm^2/V.s$ to 23.3 $cm^2/V.s$, whereas the sheet resistivity decreased from 7.68 ${\Omega}{\cdot}cm$ to 5.11 ${\Omega}{\cdot}cm$.
Fe - EDTA 착물을 이용한 황화수소 제거의 최적 반응 조건
진상기,차진명,이인화,윤석진,김시욱 ( Sang Gi Jin,Jin Myeong Cha,In Wha Lee,Suk Jin Yoon,Si Wouk Kim ) 한국공업화학회 1996 공업화학 Vol.7 No.1
Fe-EDTA 착물을 이용한 황화수소 제거의 최적 반응 조건을 기포탑 반응기에서 조사하였다. 착물의 농도가 증가할수록 황화수소 산화 반응에서 전환량은 증가하였고 pH 변화와 Fe 농도는 완만하게 감소하였으며 elemental sulfur의 생성량은 증가하였다. 또한 황화수소는 0.05M 이상의 착물 농도에서 효율적으로 제거되었다. pH에 따른 황화수소 산화 반응에서 pH는 작물의 안정도에 중요한 인자이고 반응 중 최적 pH 범위는 8.5∼9.5이었다. [EDTA]/[Fe] 비가 증가할수록 황화수소 산화 반응의 전환량은 증가하였고 반응 중 EDTA 농도가 감소하면 FeS로 침전이 촉진되어 전환량은 감소하였다. 즉 EDTA 농도가 증가될수록 Fe-EDTA 착물이 안정되어 전환량이 증가하였다. The optimum conditions for the removal of hydrogen sulfide by Fe-EDTA complex in the bubble column reactor were investigated. As the concentrations of the complex increased, the conversion rate of hydrogen sulfide increased, while Fe concentration and pH were stably decreased and the amount of elemental sulfur produced was also increased. Hydrogen sulfide was removed efficiently when the concentration of Fe-EDTA complex was maintained more than 0.05M. pH acts as an important factor for the stability of complex in the oxidation of hydrogen sulfide and optimum pH range was 8.5∼9.5. As the molar ratio of EDTA : Fe was increased, the conversion rate of hydrogen sulfide became stable. However, the rate was decreased due to the precipitation of FeS when the concentration of EDTA was decreased. As the concentration of EDTA increased, the conversion rate of hydrogen sulfide increased due to the high stability of Fe-EDTA complex.