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나노/마이크로 바이모달 피드스탁의 유변학적 물성에 대한 연구
노재범(Jaebum Noh),오주원(Joo Won Oh),박재만(Jae Man Park),박성진(Seong Jin Park) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
Powder injection molding technique is an appropriate manufacturing process for 3-dimensional complex products. Nano powder was introduced in the process for microfabrication, but it increases the process difficulty and process cost. Nano/micro bimodal powder can be a solution to minimize the drawback of nano powder. Some research groups dealt with nano/micro bimodal powder injection molding process. However, most of their works only focused on the properties of sintered samples despite the importance of the injection molding step. Thus, in this study, the rheological property of nano/micro bimodal feedstocks was investigated with capillary rheometer. Flow index and flow activation energy were calculated from the result with the Arrhenius and powder law model. Moldability index was also obtained for each feedstock, and 12 % nano bimodal feedstock was regarded as the most desirable feedstock for injection molding process.
Propulsion Machinery Requirements of the Ice Class Regulations
박종연(Park Jong Youn),오주원(Oh Joo Won),문준식(Moon June Sik) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.10
The Finnish Maritime Administration issued new ice class regulations on 15 December 2008. As most of the classification societies have adopted the regulations into their own ice class rules, KR also adopted the regulations into the 2010 Rules for the Classification of Steel Ships and this Rules apply to ships for which contracts for construction are signed on or after 1 July 2010. In this presentation, propulsion machinery requirements of the new ice class regulations and their technical background will be introduced.
문준식(June-Sik Moon),이상수(Sang-Su Lee),박정훈(Chung-Hoon Park),오주원(Joo-Won Oh) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
Global warming has become the most complicated issue in these days. Along this trend, alternative systems for propulsion have been developed such as gas fuel, fuel cell and solar power, etc. Among them, a gas-fuelled ship has been recognized as one of the best practicable systems. For this reason, IMO has been discussing the safety of gas fuelled ships for developing regulations since 2004. This paper introduces IMO's trend for gas-fuelled ships briefly.