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대쉬부 두께가변 차음구조 개발과 실내투과 소음에 관한 연구
이진형(Jinhyung LEE),우창완(Changoan Woo),이호달(Hodal LEE),성창모(Changmmo Seong),채기상(Kisang Chae),안옥균(Okkyun An),이정욱(Jungwook LEE),박장석(Jangseok Park),신상조(Sangjo Shin) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
Applying a variable thickness insulation material dash isolation Pad. Pu spray applied insulation thickness variable structure is a study about the dash isolation pad. While reducing the total area thick insulation material was applied to the area to reinforce the part thickness. Reinforced sound insulation performance weakened only a dash portion and to reduce the insensitive part by weight.
이진형(JinHyung Lee),이종헌(JongHeon Lee),이호달(HoDal Lee),김이태(YTae Kim),성창모(Changmo Seong),박장석(JangSeok Park) 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6
A manufacturing process for applying spray-type poly-urethane material is developed for dash isolation pad’s heavy layer. With the manufacturing process, thickness of heavy layer of dash isolation pad could be varied locally. In this study, the sound insulation performance of the material had been studied in the material level. The weak areas of engine-noise transmission were found experimentally for a target vehicle. By increasing heavy layer’s thickness at the noise-transmission weak areas and decreasing the thickness at the non-weak areas, the noise-transmission was refined and the total weight was also reduced. It is expected that the developed material and manufacturing process could contribute to weight and cost reduction of sound packages.
선상 이산화탄소 포집시스템 기술에 관한 국제해사기구(IMO) 해양환경보호위원회(MEPC) 논의 동향
이성엽(Seong-yeob Lee),정태환(Tae-hwan Joung),강성길(Seong-gil Kang),이다희(Dahee Lee),김진형(Jinhyung Lee),이상혁(Sanghyuk Lee) 한국해양환경·에너지학회 2021 한국해양환경·에너지학회 학술대회논문집 Vol.2021 No.10
선박은 효율적이며 친환경적인 화물운송 수단이지만, 국제사회는 더 개선된 지구환경을 위해 선박으로부터의 오염물질 방출 저감을 요구하고 있다. 국제해사기구(IMO)는 국제항행을 하는 선박에서 배출되는 온실가스 감축 목표를 2008년 대비 2050년까지 최소 50%로 설정하였다. 현 시점에서 해운사들은 운항속도를 조절함으로써 탄소 배출량 규제에 대응하고 있으며, 조선업계에서는 에너지 효율 개선 장치, 저탄소(LNG, 메탄올 등) 추진 기술, 무탄소(암모니아, 수소 등) 추진 기술 등을 개발하고 있다. 최근 제4차 IMO GHG 연구 결과에서는 IMO 온실가스 감축 목표에 대응하기 위해서 무탄소 및 탄소중립연료 도입이 반드시 필요하다는 결론을 도출하였다. 하지만, 무탄소 대체연료(암모니아, 수소)를 선박에 상용화시키기 위해서는 극복해야할 난제가 상당히 많다. 현재 IMO 해양환경보호위원회(MEPC)에서 논의되고 있는 온실가스 감축 계획이 일정 변경없이 진행되고, 무탄소 선박연료 상용화에 상당한 시간이 소요될 것이라면, 징검다리 기술로서 선상 이산화탄소 포집시스템(Onboard Carbon Capture & Storage System, OCCS)을 고려할 필요가 있다. 본 연구에서는 현재 선박에 고려되고 있는 OCCS 기술을 검토하고, EEDI/EEXI 프레임에 OCCS 영향을 반영하는 산정식을 제안한다. Ships are an efficient and eco-friendly means of transporting cargo, but the international community is demanding lower emissions of pollutants from ships for a better global environment. The International Maritime Organization (IMO) has set its target for reducing greenhouse gas emissions from international vessels at least 50% by 2050 compared to 2008. At this point, shipping companies are responding to regulations on carbon emissions by controlling operating speed, and shipbuilding industries are developing energy efficiency improvement devices, low-carbon (LNG, methanol, etc.) propulsion technologies, and carbon-free (ammonia, hydrogen, etc.) propulsion technologies. Recent results from the fourth IMO GHG study concluded that the introduction of carbon-free and carbon-neutral fuels is essential to respond to IMO greenhouse gas reduction goals. However, there are considerable challenges to overcome in order to commercialize carbon-free alternative fuels (ammonia, hydrogen) on ships. If the greenhouse gas reduction plan, currently being discussed at the IMO Marine Environmental Protection Commission (MEPC), will take considerable time to commercialize carbon-free ship fuels, it is necessary to consider onboard Carbon Capture & Storage System (OCCS) as a stepping stone technology. In this study, we review the OCCS technology currently being considered for ships and propose a formula that reflects the OCCS impact on EEDI/EEXI frames.
The Impact of Financial Crisis on the Financial Asset in California Hospitals
Jinhyung Lee 한국경제연구학회 2015 Korea and the World Economy Vol.16 No.1
During the financial crisis in 2008, the US economy experienced a massive economic collapse and financial market meltdown. However, how this financial crisis affected the healthcare industry has not been well investigated. Thus, this study examines the impact of the 2008 financial crisis on the financial assets of not-for-profit hospitals in California from 2006 to 2010. The data are analyzed using a generalized estimating equation with a normal distribution and log link function. This study found that not-for-profit hospitals were suffering in investing in financial assets during the financial crisis. This short of financial asset investment may lead to poor quality of care and the inability to meet growing demands for care and services.