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양슬기,이혜영,전진아,김석환,이직,박일흥,Yang, Seul Ki,Lee, Hye-Young,Jeon, Jina,Kim, Sug-Whan,Lee, Jik,Park, Il H. 한국천문학회 2012 天文學會報 Vol.37 No.2
We report technique used for improved measurement uncertainties for Photon detection efficiency(PDE) of $1mm^2$ single pixel SiPM. It consists of 470nm LED light source, two 2-inch integrating sphere and two NIST calibrated silicon photodiodes that have ${\pm}2.4%$ calibration error. With raytracing simulation of our experimental setup, we predict number of photon into SiPM and measurement uncertainty. For MPPC, Hamamatsu suggested PDE(1600 micro pixel) including crosstalk and afterpulse is 23.5% at 470 nm. By using new low calibration error photodiode and raytracing simulation, our simulation result has ${\pm}3%$ measurement uncertainty. The technical detail of measurement, simulation are presented with the results and implication.
알루미늄 합금 GMAW 용접부의 전기화학적 방법에 의한 내식성 평가
양예진(Ye-Jin Yang),박일초(Il-Cho Park),이정형(Jung-Hyung Lee),한민수(Min-Su Han),김성종(Seong-Jong Kim) 한국표면공학회 2017 한국표면공학회지 Vol.50 No.6
The aim of the present study is to evaluate electrochemical corrosion characteristics of base metal and weldment of Al-Mg alloy in seawater solution. The specimen was 5mm thick 5083-H321 Al alloy plate which was butt-welded using gas metal arc welding (GMAW). To identify the types of inclusions in the weldment, the microstructural observation was performed along with Energy dispersive spectrometer (EDS) analysis. The anodic polarization experiments were performed to evaluate the corrosion characteristics. After the anodic polarization test, the corroded surface was observed by SEM(scanning electron microscope) and EDS. The result of the analysis revealed a large number of voids in the weldment, especially coarse grains and inclusions in the heat affected zone. The corrosion current density of the weldment was found to be approximately 13 times higher than that of the base metal, indicating lower corrosion resistance of the weldment due to the defects in the weldment and the heat affected zone.
초고에너지 우주선 관측을 위한 JEM-EUSO 프로젝트의 진행 현황
임희진,김석환,김순욱,박일흥,양종만,이직,정애라,Im, Hui-Jin,Kim, Seok-Hwan,Kim, Sun-Uk,Park, Il-Heung,Yang, Jong-Man,Lee, Jik,Jeong, Ae-Ra 한국천문학회 2012 天文學會報 Vol.37 No.2
JEM-EUSO (Extreme Universe Space Observatory on-board the Japanese Experiment Module)는 국제우주정거장(International Space Station)의 일본 실험 모듈인 'KIBO'에 우주 망원경을 설치하여, 100 EeV이상의 초고에너지 우주선 관측을 수행함으로써, 초고에너지의 스펙트럼, 구성성분과 기원을 연구하는 국제공동연구 프로젝트이다. 구경 2.5 m로 60도의 광시야각을 가지는 대형 굴절 망원경을 통해서, 지구 대기에 우주선 shower로부터 발생한 형광 신호를 관측하려고 한다. 이 프로젝트는 2016~2017년에 발사되어, 5년 이상의 임무 수행을 목표로 하고 있으며, 그 전단계로 Prototype 시스템을 가지고 지상실험인 EUSO-TA와 고도 40 km에서 수행할 EUSO-Balloon실험을 준비하고 있다. 먼저, 망원경의 prototype을 2012년 12월쯤 미국 유타에 있는 Telescope Array(TA) 실험에 설치하여 우주선 또는 임의로 인가한 광원에 의해서 생성된 shower를 TA의 Fluorescence Detector와 함께 측정하여, 시스템 calibration과 더불어 지상에 검출된 우주선을 연구할 계획이다. 그 이듬해인 2013년 여름에는 Balloon에 망원경의 Engineering model을 실어서, 대기고도 40 km아래에서 우주선에 의해 생성되는 shower를 개발한 트리거 시스템을 통해서 검출하고, 대기권에 존재하는 UV background 광원들을 측정하여 우주선을 연구할 예정이다. 한국 그룹은 JEM-EUSO을 위해서 개발한 디지털 신호처리 및 트리거 장치의 제작 중에 있으며, 위의 실험들을 위해 망원경과 함께 조립하여 테스트를 수행할 계획이다.
확장형 심근증 환자에서의 좌심실 확장 기능에 관한 연구
강기상(Gi Sang Kang),박일(Il Park),박정하(Jung Ha Park),양창호(Chang Ho Yang),김선택(Sun Taek Kim),김종성(Jong Seong Kim) 대한내과학회 1993 대한내과학회지 Vol.45 No.2
Background: To evaluate left ventricular diastolic function in the patients with dilated cardiomyopathy, pulsed doppler echocardiography was used to study mitral flow velocity in 14 patients with dilated cardiomyopathy and mitral regurgitation (DCMR (+)), 18 patients with dilated cardiomyopathy but no mitral regurgitation (DCMR (-)) and 65 normal subjects in Heart Center Dong-A University Hospital, between May 1990 and september 1992. Methods: Left ventricular end diastolic dimension (LVEDD), ejection fraction (E,F.) and left atrial dimension (LAD) were calculated from M-mode echocardiography, and A2-D (isovolumic relaxation time), DF (the duration of early diastolic flow) E-F slope (the rate of deceleration of early diastolic flow), E height (the maximal early diastolic blood flow velocity), A height (the maximal late diastolic blood flow velocity) and A/ E ratio were measured from Doppler mitral flow velocity recordings. Results: 1) LVEDD, 68+5 mm and E.F., 21±2% in DCMR (+), and LVEDD, 65±4 mm E.F., 23±2% in DCMR (-) were significantly different from 46±4 mm and 61±6% in the normal healthy groups. LAD, 48±6 mm in DCMR (+) and 44±5 mm in DCMR (-) were signifantly increased being compared with LAD 32±5 mm in the normal group. 2) A2-D, 90.4±8.6 ms in DCMR (+) and 91.3±9.4 ms in DCMR (-) were significantly longer than 70.2±11.5 ms in the normal healthy groups. EF slope, 342.3±115.5 cm/sec in DCMR (+) were significantly decreased from 411.5±125.4 cm/sec2 in DCMR (-) and 391.9±159.6 cm/sec2 in the normal control groups. DF, 289.4±32.5 ms in DCMR (+) and 297.4±45.3 cm/sec2 in DCMR (-) were significantly longer than 235.9±56.5 ms in the normal groups. E height, 38.6±7.8 cm/sec in DCMR (-) was significantly decreased from 51.1±9.2 cm/sec in the normal group and 60.4±10.2 cm/sec in DCMR (+). A height, 48.7±8.6 cm/sec in the normal group was not significantly different from 39.7±11.5 cm/sec and 45.4±6.4 cm/sec in DCMR (-). A/E ratio, 1.4±0.5 in DCMR (-) was significantly increased from 1.0±0.4 in the normal group and 0.7±0.4 in DCMR (+). Conclusions: We confirmed that the DF (the duration of the early diastolic flow) in DC was prolonged than in the normal group and E height (the maximal early diastolic blood flow velocity) in DCMR (-) was de- creased and EF slope (the rate of deceleration of early diastolic flow) in DCMR (-) was increased than in DCMR (+).
과망간산과 옥살산 화학제염 공정 시 원전기기용 STS 304의 부식 손상 특성
한민수(Min-Su Han),정광후(Kwang-Hu Jung),양예진(Ye-Jin Yang),박일초(Il-Cho Park),김기철(Ki-Chul Kim),서범철(Bum-Chul Seo),박주현(Ju-Hyun Park),김성종(Seong-Jong Kim) 한국표면공학회 2017 한국표면공학회지 Vol.50 No.4
This study was carried out with solution temperature variables of 75 ℃ and 90 ℃ for STS 304, which is a nuclear equipment material, in order to determine the corrosion damage behavior in chemical decontamination process using permanganic acid and oxalic acid. Then electrochemical polarization experiment, weight loss measurement, surface morphology observation and surface damage depth were measured every cycle of the decontamination process to analyze the degree of corrosion damage. As a result, the corrosion current density, weight loss, and surface damage increased as the decontamination process cycle increased, and the corrosion damage of STS 304 tended to increase. Few μm pitting damage was observed on the surface observation. In 5 cycle, the elongated wormhole-type pitting damage appeared, leading to relatively large surface damage. However, there was no significant difference in the degree of surface damage resulting from the increase in the temperature of the chemical decontamination solution.
화학제염공정에서 환원공정조건에 따른 Inconel 600의 부식손상 특성
한민수(Min-Su Han),정광후(Kwang-Hu Jung),양예진(Ye-Jin Yang),박일초(IL-Cho Park),이정형(Jung-Hyung Lee),김성종(Seong-Jong Kim) 한국표면공학회 2017 한국표면공학회지 Vol.50 No.5
In this study, we evaluated tendency and degree of corrosion damages of Inconel 600 after chemical decontamination treatments under three different conditions. In the decontamination processes, the oxidation and reduction were performed as one cycle. Each process was continued up to 5 cycles. Characteristics of corrosion under decontamination processes were evaluated by Tafel analysis and weight loss. Characteristics of surface damage were observed by scanning electron microscope(SEM) and three-dimensional(3D) microscope. As the cycle proceeded, weight loss and corrosion current density increased. Intergranular corrosion damage occurred on the surface of the materials. The result revealed that the surface of Inconel 600 was attacked by the strong acid solution under all chemical decontamination processes, but the degree of the corrosion damage was different depending on the processes.