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안준건,임운혁,심원준,김기범,김승규,이희일 한국해양과학기술원 2009 Ocean and Polar Research Vol.31 No.2
Passive air samplers with polyurethane foam (PUF) disks were employed to determine seasonal gas phase variation of polycyclic aromatic hydrocarbons (PAHs) in ambient air on Anmyeon island from March 2007 to January 2008. Sum of 13 PAHs ranged between 3.5 ng/m3 and 27.6 ng/m3. Total PAHs during the heating season was 6.2 times higher than non-heating season. The dominant PAHs components during sampling periods were low and middle molecular weight PAHs including phenanthrene, fluoranthene, pyrene and chrysene. Gas exchange fluxes of PAHs across the air-water interface of the Yellow Sea were calculated using a modified two-film exchange model. PAHs fluxes ranged from 196 ng/m2/d net volatilization during summer to 3830 ng/m2/d net absorption during winter. Passive air sampler provides a convenient and cost-effective tool for measuring averaged gas phase PAHs, which was successfully used for calculation of gas exchange flux of PAHs in the Yellow Sea. Passive air samplers with polyurethane foam (PUF) disks were employed to determine seasonal gas phase variation of polycyclic aromatic hydrocarbons (PAHs) in ambient air on Anmyeon island from March 2007 to January 2008. Sum of 13 PAHs ranged between 3.5 ng/m3 and 27.6 ng/m3. Total PAHs during the heating season was 6.2 times higher than non-heating season. The dominant PAHs components during sampling periods were low and middle molecular weight PAHs including phenanthrene, fluoranthene, pyrene and chrysene. Gas exchange fluxes of PAHs across the air-water interface of the Yellow Sea were calculated using a modified two-film exchange model. PAHs fluxes ranged from 196 ng/m2/d net volatilization during summer to 3830 ng/m2/d net absorption during winter. Passive air sampler provides a convenient and cost-effective tool for measuring averaged gas phase PAHs, which was successfully used for calculation of gas exchange flux of PAHs in the Yellow Sea.
안준건 ( Ahn Junkeon ) 한국해운물류학회 2023 해운물류연구 Vol.39 No.1
국제해사기구는 해양환경규제 강화를 통하여 탈탄소화된 국제해운을 주도하고 있다. 기후변화의 가속화로 인하여 국제해운은 친환경으로의 전환이 필수적이며, 이를 위한 선박금융이 반드시 수반되어야 한다. 전 세계 금융기관들은 2008년 금융위기 이후부터 현재까지 고가성 자산인 선박에 관한 자산담보부금융 취급을 회피하려는 경향을 보여주고 있다. 비금융권의 시장참여로 인하여 선박금융 생태계가 변화되고 있으나, 장기간에 걸친 안정적인 선박금융을 위해서는 선박자산의 신용 증가가 필요한 실정이다. 국적외항선대 확보를 위한 선박금융은 국제해사기구의 해양환경규제와 국제결제은행의 금융규제를 동시에 만족해야 한다. 본 연구는 이 규제들을 살펴보고, 친환경선박 인증제를 활용한 선박금융 조달 방안을 제시한다. 친환경선박 인증제는 선박금융을 녹색금융으로 조달이 가능하도록 해줄 수 있으며, 국내 해운업의 경쟁력 강화에 기여하는 제도적 기반이 될 수 있다. 선박자산의 친환경성을 국가가 인정함으로써, 이를 활용한 해운사의 영리활동에 안정적인 자금 융통을 가능하게 한다. The International Maritime Organization takes international shipping to de-carbonization through marine environmental regulations. The shipping sector should switch to green shipping corresponding to climate change and obtain green ships using green finance. The financial institutions seem to be avoided asset-based finance about ships with high prices from the global financial crisis of 2008 to the present. While non-banking participants make the ship finance market changed, the conventional maritime market requires a long-term and stable financing service based on the credential of a ship asset. The ship finance to obtain a vessel should simultaneously follow global environmental and financial regulations. This study suggests an alternative to raising the ship finance linked to Greenship Certification Scheme for the sustainable shipping industry. The Greenship Certification guarantees the green credential of a vessel for finance and contributes to enforcing the competitiveness of the Korean shipping industry. This green credential favorably makes ship financing easy because the Korean government recognizes the value of an asset.
안준건(Junkeon Ahn),노일용(Yeel-Yong Noh),이예슬(Yeseol Lee),장대준(Daejun Chang) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
The LOPA (layer of protection analysis) of IEC 61511 was applied to determination of the safety integrity level of the safety systems for a cryogenic pump test facility as a large-scale mechanical system. The whole system was divided into seven segments, and the severity of each accident was evaluated considering the potential hazards suggested by API RP 14C. The LOPA was applied to the accidents with the severity level of C, D, E and F. An accident had multiple hazards, and its frequency was compared to the acceptable frequency with the failure frequency of the independent protection layers taken into account. Accidents required safety systems with SIL 1 or stricter necessitated safety-instrumented systems. If the required safety integrity level was SIL 3 or stricter, detailed and quantitative risk analysis was requested to justify the assigned safety integrity level.
퍼지기반 해양 미생물 이용 수소 제조 공정의 고장유형 및 영향분석
박성호,안준건,김수현,유영돈,장대준,강성균,PARK, SUNG HO,AHN, JUNKEON,KIM, SU HYUN,YOO, YOUNG DON,CHANG, DAEJUN,KANG, SUNGKYUN 한국수소및신에너지학회 2018 한국수소 및 신에너지학회논문집 Vol.29 No.4
In this study, the failure mode and effect analysis (FMEA) of hydrogen production process by using the Thermococcus onnurineus NA1 was conducted and advanced methodology to compensate the weakness of previous FMEA methodology was applied. To bring out more quantitative and precise FMEA result for bio-hydrogen production process, fuzzy logic and potential loss cost estimated from ASPEN Capital Cost Estimator (ACCE) was introduced. Consequently, risk for releasing the flammable gases via internal leakage of steam tube which to control the operating temperature of main reactor was caution status in FMEA result without applying the fuzzification and ACCE. Moreover, probability of the steam tube plugging caused by solid property like medium was still caution status. As to apply the fuzzy logic and potential loss cost estimated from ACCE, a couple of caution status was unexpectedly upgraded to high dangerous status since the potential loss cost of steam tube for main reactor and decrease in product gases are higher than expected.
액화공기(Liquid Air) 예냉기반 수소액화공정 성능 해석 및 최적화
박성호,안준건,류주열,고아름 한국수소및신에너지학회 2019 한국수소 및 신에너지학회논문집 Vol.30 No.6
The intermittent electric power supply of renewable energy can have extremely negative effect on power grid, so long-term and large-scale storage for energy released from renewable energy source is required for ensuring a stable supply of electric power. Power to gas which can convert and store the surplus electric power as hydrogen through water electrolysis is being actively studied in response to increasing supply of renewable energy. In this paper, we proposed the novel concept of hydrogen liquefaction process combined with pre-cooling process using the liquid air. It is that hydrogen converted from surplus electric power of renewable energy was liquefied through the hydrogen liquefaction process and vaporization heat of liquid hydrogen was conversely recovered to liquid air from ambient air. Moreover, Comparisons of specific energy consumption (kWh/kg) saved for using the liquid air pre-cooling was quantitatively conducted through the performance analysis. Consequently, about 12% of specific energy consumption of hydrogen liquefaction process was reduced with introducing liquid air for pre-cooling and optimal design point of helium Brayton cycle was identified by sensitivity analysis on change of compression/expansion ratio.