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Oh, Daekyun,Lee, Chang-Woo The Korean Society of Marine Environment and safet 2017 海洋環境安全學會誌 Vol.23 No.3
CE RCD (Recreational Craft Directive) is a certification for the design and construction of small vessels, including pleasure yachts, which are widely used not only in the countries within the European Union, but also in Japan and Southeast Asia. Recently, South Korean leisure craft shipyards have developed interest in exporting to foreign leisure craft markets such as Europe; however, they have encountered difficulties because of the CE RCD regulations, which are relatively complex and difficult to understand. The requirements for buoyancy and stability, which are essential properties that must be understood within the early stage of ship design, are defined based on ISO 12217. However, preparing this assessment according to ship classification regulations is an exceedingly complex task, even with knowledge of naval architecture. In this research, we have developed design support tools to systematically support assessments and preemptively define design information so that buoyancy and stability assessments based on ISO 12217 can be systematically prepared. Our research results were applied to actual examples of yacht design to confirm validity. We believe that the improved yacht design process presented in this research can act as a foundational reference for enhancing the effectiveness and systematic buoyancy and stability assessments.
Daekyun Oh,Chang-Woo Lee 해양환경안전학회 2017 해양환경안전학회지 Vol.23 No.4
CE RCD (Recreational Craft Directive) is a certification for the design and construction of small vessels, including pleasure yachts, which are widely used not only in the countries within the European Union, but also in Japan and Southeast Asia. Recently, South Korean leisure craft shipyards have developed interest in exporting to foreign leisure craft markets such as Europe; however, they have encountered difficulties because of the CE RCD regulations, which are relatively complex and difficult to understand. The requirements for buoyancy and stability, which are essential properties that must be understood within the early stage of ship design, are defined based on ISO 12217. However, preparing this assessment according to ship classification regulations is an exceedingly complex task, even with knowledge of naval architecture. In this research, we have developed design support tools to systematically support assessments and preemptively define design information so that buoyancy and stability assessments based on ISO 12217 can be systematically prepared. Our research results were applied to actual examples of yacht design to confirm validity. We believe that the improved yacht design process presented in this research can act as a foundational reference for enhancing the effectiveness and systematic buoyancy and stability assessments.
오대균(Daekyun Oh),이동건(Dongkun Lee),정숙현(Sookhyun Jeong) Korean Society for Precision Engineering 2019 한국정밀공학회지 Vol.36 No.9
In this study, optimum design algorithm for composite ship structures is applied to a 52-ft. yacht to conduct comparative analyses by life cycle assessments, through which a material design method is proposed to cope with environmental regulation of the ship. Through the case study, the weight of the ship was reduced, and life cycle assessments of the original and lightweight vessels were performed using SimaPro 8. Weight was reduced by 10.47%. Also, at ‘In Production’, global warming and ozone layer depletion indicators decreased by 26.3 and 42.9%, respectively. At ‘In Use’, global warming and ozone layer depletion indicators decreased by 3.81%, with the ship operating for 20 years. Environmental impact of unit weight glass fiber and resin (raw materials used in composite structures) were compared. It was found that resin has higher impact on global warming and ozone depletion than glass fiber by factors of two and eight, respectively. Consequently, it was confirmed that a material design that preferentially reduces content of resin improves the eco-friendly performance of the composite ship.
복합재료로 제작된 레저보트의 설계 정보 교환을 위한 현황 분석
이재철(Jaecheol Lee),오대균(Daekyun Oh),문두환(Duhwan Mun) (사)한국CDE학회 2013 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2013 No.8
레저보트의 건조 과정에서 설계와 인증을 위해서 다양한 도구와 시스템이 필요하나 레저보트 개발을 위한 통합 설계환경은 매우 열악한 실정이다. 우리나라와 같은 건조 중심의 레저보트 개발 환경에서는 설계 및 생산 시스템의 자동화가 중요한 요소이며 이를 위해서는 시스템 간의 데이터 상호운용성 확보가 반드시 필요하다. 이 논문에서는 복합재료로 제작된 레저보트의 설계 정보 교환을 위한 기초 연구로서 관련 산업 데이터 표준, 설계 자동화 시스템, 업무 단계별 복합재료 데이터 요구사항을 분석하였다.
Daeyeon Kim,Jinsil Cheon,Jeonghoon Kim,Daekyun Hwang,Ikpyo Hong,Oh Hyeong Kwon,Won Ho Park,Donghwan Cho 한국탄소학회 2017 Carbon Letters Vol.22 No.-
In the present study, biomass-based lignin was extracted from industrial waste black liquor and the extracted lignin was characterized by means of attenuated total reflectance- Fourier transform infrared spectroscopy and 1H-nuclear magnetic resonance spectroscopy. The extracted lignin was carbonized at different temperatures and then activated with steam at 850oC. The extracted lignin in powder state was transformed into a bulky carbonized lignin due to possible fusion between the lignin particles occurring upon carbonization. The carbonized and then pulverized lignin exhibits brittle surfaces, the increased thermal stability, and the carbon assay with increasing the carbonization temperature. The scanning electron microscopic images and the Brunauer-Emmett-Teller result indicate that the steam-activated carbon has the specific surface area of 1718 m2/g, which is markedly greater than the carbonized lignin. This study reveals that biomassbased activated carbon with highly porous structure can be produced from costless black liquor via steam-activation process.