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CFD 기반 염화수소 유출 사고 시 증기운의 확산 거동 분석
조승범 국제차세대융합기술학회 2024 차세대융합기술학회논문지 Vol.8 No.2
최근 석유화학 및 반도체산업 발전에 따라 염화수소와 같은 독성 화학물질의 사용량이 증가하고 있어 유 출사고 발생시 피해 영향범위를 예측하고 적합한 비상조치계획 수립이 요구되고 있다. 본 연구에서는 전산유체역 학을 활용하여 외기 풍속과 유출 속도에 따른 염화수소 증기운의 대기확산 거동을 확인하였다. 유출 속도가 빠를 수록 누출량의 증가로 확산범위가 증가하고, 외기 풍속이 높아질수록 빠른 확산을 통한 대기 희석으로 영향범위가 감소하는 것을 확인하였으며, 중심부의 최대 이동속도는 최대 20 m/s 이상으로 분석되었다. 또한, ERPG-2 초과 농도 구역은 유출 속도 증가에 비례하였으며, 2.0 kg/s 조건에서 전체영역(3,000 m)으로 확대되었다. 모든 구역의 최대 농도는 MP1 구역에서 2.0 kg/s 유출 속도와 0.5 m/s 외기 풍속에서 387 ppm, 최저 농도는 0.1 kg/s 유출 속도와 5.0 m/s 외기 풍속에서의 146 ppm으로 확인되었다. 이러한 결과를 통해, 염화수소 증기운의 확산거동은 각 이동 구간별로 유출 속도 및 외기 풍속의 지배를 받을 수 있음을 확인하였으며, 빠른 외기 풍속에서는 유출량 과 관계없이 염화수소의 확산 현상이 활발히 이루어져 사고 발생 시 실내 대피가 우선하여 실시될 필요가 있을 것으로 판단된다. The expansion of the petrochemical and semiconductor industries intensify the use of toxic chemicals, necessitating anticipation of spill damage and effective emergency action plans. This study employs CFD to validate hydrogen chloride vapor cloud diffusion concerning external wind speed and outflow velocity. Higher outflow speed increases the spread of vapor, while higher wind speed reduces the area of influence. The analysis indicated a movement speed surpassing 20 m/s and the ERPG-2 excess concentration area expanded proportionally with increased outflow velocity, covering the entire region at 2.0 kg/s. At 2.0 kg/s and 0.5 m/s in the MP1 zone, the maximum concentration reached 387 ppm, while the lowest concentration of 146 ppm was noted at 0.1 kg/s and 5.0 m/s. Results confirm that the diffusion of hydrogen chloride vapor clouds is influenced by outflow and wind speed, highlighting that shelter-in-place needs to be given priority for high wind speeds.
Si 기판의 연삭 공정이 산화주석 박막의 전기적 성질에 미치는 영향 연구
조승범,김은경 한국마이크로전자및패키징학회 2018 마이크로전자 및 패키징학회지 Vol.25 No.2
최근 유연 소자, 투명 소자, MEMS 소자와 같은 다양한 소자를 결합하는 시스템 집적화 기술이 많이 개발되고 있다. 이러한 다종 소자 시스템 제조 기술의 핵심 공정은 칩 또는 웨이퍼 레벨의 접합 공정, 기판 연삭 공정, 그리고박막 기판 핸들링 기술이라 하겠다. 본 연구에서는 Si 기판 연삭 공정이 투명 박막 트랜지스터나 유연 전극 소재로 적용되는 산화주석 박막의 전기적 성질에 미치는 영향을 분석하였다. Si 기판의 두께가 얇아질수록 Si d-spacing은 감소하였고, Si 격자 내에 strain이 발생하였다. 또한, Si 기판의 두께가 얇아질수록 산화주석 박막 내 캐리어 농도가 감소하여 전기전도도가 감소하였다. 얇은 산화 주석 박막의 경우 전기전도도는 두꺼운 산화 주석 박막보다 낮았으며 Si 기판의 두께에 의해 크게 변하지 않았다. Recently, technologies for integrating various devices such as a flexible device, a transparent device, and a MEMS device have been developed. The key processes of heterogeneous device manufacturing technology are chip or wafer-level bonding process, substrate grinding process, and thin substrate handling process. In this study, the effect of Si substrate grinding process on the electrical properties of tin oxide thin films applied as transparent thin film transistor or flexible electrode material was investigated. As the Si substrate thickness became thinner, the Si d-spacing decreased and strains occurred in the Si lattice. Also, as the Si substrate thickness became thinner, the electric conductivity of tin oxide thin film decreased due to the lower carrier concentration. In the case of the thinner tin oxide thin film, the electrical conductivity was lower than that of the thicker tin oxide thin film and did not change much by the thickness of Si substrate.
독성 가스 누출 시 건물 방향이 대피 기준에 미치는 영향에 관한 수치 해석 연구
조승범 한국가스학회 2023 한국가스학회지 Vol.27 No.4
With the recent increase in the use of lithium-ion batteries, the risk of fire and explosion is also increasing. The purpose of this study is to secure the safety of the process by studying the combustion characteristics of EC(Ethylene Carbonate), Which is mainly used as an electrolyte organic solvent for lithium ion batteries. The flash points of the EC by using Setaflash and Pensky-Martens closed-cup testers were experimented at 141 ℃ and 143 ℃, respectively. The flash points of the EC by Tag and Cleveland open cup testers were experimented at 152 ℃ and 156 ℃, respectively. The AIT of the EC was experimented at 430 ℃. The LEL calculated by using lower flash point of Setaflash was calculated at 3.6 vol.%.
조승범,김사라은경,Cho, Seungbum,Kim, Sarah Eunkyung 한국마이크로전자및패키징학회 2017 마이크로전자 및 패키징학회지 Vol.24 No.3
As the performance and density of IC devices increase, especially the clock frequency increases, power grid network integrity problems become more challenging. To resolve these power integrity problems, the use of passive devices such as resistor, inductor, and capacitor is very important. To manage the power integrity with little noise or ripple, decoupling capacitors are essential in electronic packaging. The decoupling capacitors are classified into voltage regulator capacitor, board capacitor, package capacitor, and on-chip capacitor. For next generation packaging technologies such as 3D packaging or wafer level packaging on-chip MIM decoupling capacitor is the key element for power distribution and delivery management. This paper reviews the use and necessity of on-chip decoupling capacitor.
단일벽 탄소 나노튜브의 흡광도 신호를 이용한 DNA 결합 측정
조승범(Chengfan Cao),윤도경(Dokyung Yoon),최재붕(Jae-Boong Choi),김영진(Young-Jin Kim),백승현(Seunghyun Baik) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
Single walled carbon nanotubes(SWCNTs) can be applied for biomolecular sensors and/or markers due to their small size and excellent optical properties such as near infrared fluorescence and absorption. Here, we put out an optical biosensor using absorption signal of SWCNTs to detect DNA hybridization. SWCNTs exhibit sharp absorption peak distributions at different wavelengths when they exist in a well-dispersed solution state. It is found that DNA hybridization results in red peak shifts of nanotubes in the near infrared region. Compared to metallic species, semiconducting SWCNTs show manifest variations. The findings in this work make SWCNTs be used to selectively recognize various DNA interactions.
체크밸브 유무에 따른 HEV용 유압제어시스템의 유압변화에 대한 연구
조승범(Seungbeom Cho),나병철(Byungchul Na),김진용(Jinyong Kim),박승욱(Seunguk Park),최현주(Hyunju Choi),정진은(Jin-Eun Chung) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
An automatic transmission (AT) shifts gears by controlling hydraulic control valves. Sufficient supply of an oil for running AT, in general, is received from a mechanical oil pump. However, for a hybrid electric vehicle, AT is consists of an parallel oil supply system added an electric oil pump for controlling idle stop-and-go system. In this system a check valve as well as clearance of pump is required for blocking the reverse flow of oil in a fluid power circuit. While operating a hydraulic system without and with a check valve, the current study provides the variation of independently hydraulic property for each oil pump two different oil viscosities at 40℃ and 85℃. As a result, pump response to hydraulic control and the flow rate of oil pressure in this system was improved. It obtained the desired oil pressure at 40℃ because of the higher viscosity of an oil. On the other hand, instead of running equipped with a check valve, running without a check valve at 80℃ had lower hydraulic property and pump response because of the reverse flow of oil at the beginning.