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실리콘광증배관 기반의 미세기둥 구조 CsI:Tl 제작 및 평가
박찬종,김기담,주관식 한국전기전자학회 2016 전기전자학회논문지 Vol.20 No.4
This study conducted the gamma ray spectroscopic analysis of the microcolumnar CsI:Tl deposited onto the SiPMs using thermal evaporation deposition. The SEM measured thickness of microcolumnar CsI:Tl and of its individual columns. From the SEM observation, the measured thickness of CsI:Tl were 450μm and 600μm. The gamma ray spectroscopic properties of microcolumnar CsI:Tl, 450μm and 600μm thick deposited onto the SiPMs were analyzed using standard gamma ray sources Ba and Cs. The spectroscopic analysis of microcolumnar CsI:Tl deposited onto the SiPMs included the measurements of response linearity over the Cs gamma ray intensity; and gamma ray energy spectrum. Furthermore from the gamma ray spectrum measurement of Ba and Cs, 450μm thick CsI:Tl showed good efficiency when measured with Ba and 600μm thick CsI:Tl was highly efficient when measured with Cs. 본 연구에서는 SiPM에 열진공증착법을 이용하여 증착한 미세기둥 구조의 CsI:Tl의 감마선 분광특성연구를 진행하였다. SEM장비를 사용하여 미세기둥 구조의 CsI:Tl의 두께와 각각의 CsI:Tl 미세기둥의 두께를 측정하였다. SEM 관측 결과 CsI:Tl의 두께는 450μm, 600μm이다. SiPM에 450μm, 600μm 두께로 증착한 미세기둥 구조의 CsI:Tl은 표준 감마선원인 Ba, Cs를 사용하여 감마선의 분광특성 평가를 진행하였다. SiPM에 증착한 미세기둥 구조 CsI:Tl의 분광특성 평가는 Cs 감마선 세기에 따른 응답 선형성과, 감마선 에너지 스펙트럼을 측정하였다. SiPM에 증착한 두께 450μm와 600μm CsI:Tl은 감마선 세기에 따라 선형성을 나타났다. 또한 Ba과 Cs의 감마선 에너지 스펙트럼 측정 결과 450μm 두께의 CsI:Tl은 Ba에 대한 특성이 좋게 평가되었고, 600μm 두께의 CsI:Tl은 Cs에서 우수한 특성을 확인할 수 있었다.
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무기염을 이용한 다공성 PVDF 고분자막의 친수화를 통한 초저압용 나노여과막 제조 연구
박찬종,조은혜,임지원,정성일 한국막학회 2014 멤브레인 Vol.24 No.1
초저압용 나노여과 중공사 복합막을 제조하기 위하여 poly(vinylidene fluoride) (PVDF) 소수성 중공사막 표면에무기염인 K2Cr2OH와 KMnO4 수용액으로 친수화 처리를 하였으며, 처리된 막 표면 위에 piperazine (PIP)과 trimesoyl chlor-ide (TMC)로 계면 중합하여 복합막을 제조하였다. NaCl, CaSO4, MgCl2 100 ppm 용액 및 300 ppm의 NaCl과 CaSO4 혼합용액을 이용하여 코팅물질의 농도, 코팅시간 및 건조시간에 따른 복합막의 투과특성을 알아보았다. 실험 결과 친수화 물질로는K2Cr2OH을 사용하였을 때 더 높은 배제율을 보였으며, 친수화 시간이 길어질수록 투과도는 향상되고 배제율은 감소하는 경향을 나타내었다. 또한 촉매인 triethyl amine (TEA)과 sodium lauryl sulfate (SLS)의 농도가 높을수록 투과도는 감소하고, 염제거율은 증가하였다. 최적 조건으로는 K2Cr2OH으로 10분 동안 친수화 시킨 PVDF 중공사막 위에 PIP 2 wt% 용액(PIP 함량 대비 Triethyl amine (TEA) 7 wt%, SLS 20 wt% 혼합용액)과 TMC 0.1 wt%를 이용하여 계면중합한 것으로 공급액 NaCl100 ppm에 대해서는 투과도 40 LMH, 제거율 50%이었고, CaSO4 100 ppm에 대해서는 투과도 48 LMH, 제거율 55%를 나타내었다. To prepare the hollow fiber nanofiltration composite membranes, the poly(vinylidene fluoride) (PVDF) mem-brane was hydrophilized with K2Cr2OH and KMnO4 aqueous solutions. And then the composite membrane was synthesized on that membrane surfaces using interfacial polymerization with piperazine (PIP) and trimesoyl chloride (TMC). The result-ing membranes were characterized in terms of the rejection and flux for NaCl, CaSO4, MgCl2 100 ppm solution and 300 ppm of NaCl and CaSO4 mixed solution by varying the coating time, drying time, and the concentration of the coating materials. As a result, the higher rejections were shown for K2Cr2OH solutionas a hydrophilization material, and the flux was enhanced while the rejection reduced as the hydrophilization time is longer. Also, the rejection increased and the flux reduced as the concentrations of triethyl amine (TEA) and sodium lauryl sulfate (SLS) were higher. Typically, the rejection 50% and flux 40 LMH for NaCl 100 ppm solution, and the rejection 55% and flux 48 LMH for CaSO4 100 ppm solution were obtained for the PVDF hollow fiber composite membrane prepared with the conditions of PIP 2 wt% (Triethyl amine (TEA) 7 wt%, SLS 20 wt% mixed solution against PIP concentration) and TMC 0.1 wt%.
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연간 소생술 제공 경험과 소생 후 저체온 치료법 도입의 관련성
박찬종,신상도,박창배,송경준,김유진,곽영호,이의중 대한응급의학회 2011 大韓應急醫學會誌 Vol.22 No.5
Purpose: Therapeutic hypothermia (TH) is recommended as a strategic post-resuscitation care for favorable neurologic outcomes. However, information concerning the implementation of TH and associated number of cardiopulmonary resuscitation (CPR) volumes is lacking. Methods: We conducted a telephone survey using a designed questionnaire from March to December, 2009. Information of target hospitals was collected from a national registry of out of hospital cardiac arrest (2006-2007). Hospital name, service levels of emergency department (ED; level 1-4),case volume of cardiopulmonary resuscitation given at each ED (high versus low volume by 34 cases per year derived from a previous sensitivity analysis study), population (metropolis exceeding one million residents), and year when TH was adopted were recorded. Demographics and factors associated with adaptation of TH were analyzed and odds ratios were calculated using a multivariate logistic regression model. Results: A total of 39,833 OHCA cases for 2 years were transported to 840 hospitals. Of these hospitals, 461(55.8%) were included for final analysis. Thirty four of the hospitals (7.4%) had adopted TH. Of these, 16 hospitals housed a high-volume ED (odds ratio=2.93). Twenty four hospitals were located in a metropolis (odds ratio=3.05) and 25 hospitals were ED level 1 or 2. Conclusion: Only 7.4% of surveyed Korean hospitals had adopted TH in Korea by the end of 2009. Hospitals with high-volume EDs adopted TH early, when adjusting for population and ED level.
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Braking performance analysis of an escalator system using multibody dynamics simulation technology
박찬종,Gero Gschwendtner 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.7
An escalator brake system composed of an operational brake and an auxiliary brake is one of the most critical components that directlyinfluence passenger safety. Therefore, understanding the braking performance of an escalator system at the early design stage is imperative. In this article, the application of multibody dynamics simulation for escalator industry is discussed. This study proposes an efficientmultibody dynamics simulation modeling approach that considers the dynamic effects of a step band, handrail band, and passenger trafficload, which requires considerable computational resources when the conventional method is employed. The approach also covers a comprehensivesimulation modeling of drive machine with gearbox, main drive chain band, operational brake system, and auxiliary brakesystem to evaluate the escalator’s braking performance at the system level. The simulation model is verified with actual measurementdata and employed to investigate potential worst case braking scenarios. The dynamic influences of these braking scenarios on the escalatorsystem are discussed as a result.
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