http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
낮은 핀관과 Turbo-B 촉진관에서 임계 열유속까지의 풀 비등 열전달계수
이요한(Yohan Lee),박기정(Ki-Jung Park),정동수(Dongsoo Jung),심상은(Sang Eun Shim) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
In this work, nucleate pool boiling heat transfer coefficients(HTCs) of 5 refrigerants of differing vapor pressure are measured on horizontal 26 fpi low fin and Turbo-B square surface of 9.53 ㎜ length. Tested refrigerants are R245fa, R152a, R134a, R22, and R32 and HTCs are taken from 10 ㎾/㎡ to critical heat flux of each refrigerant. Wall and fluid temperatures are measured directly by thermocouples located underneath the test surface and by thermocouples in the liquid pool. Test results show that the nucleate pool boiling HTCs of refrigerants increase as the vapor pressure increase. However, as the heat flux increases, the nucleate boiling HTCs increase and then decrease after certain heat fluxes gradually. Critical heat fluxes(CHFs) of all enhanced surfaces were greatly improved as compared to that of a plain surface in all tested refrigerants. CHFs of all refrigerants on the 26fpi low fin surface were increased up to 240% as compared to that of the plain surface. CHFs of the Turbo-B enhanced surface were lower than that of the 26fpi low fin surface.
열전달 촉진 표면에서 임계 열유속까지의 물의 풀 비등 열전달계수
이요한(Yohan Lee),강동규(Kang Dong Gyu),정동수(Dongsoo Jung) 대한설비공학회 2011 설비공학 논문집 Vol.23 No.3
In this work, nucleate pool boiling heat transfer coefficients(HTCs) of pure water are measured on horizontal 26 fpi low fin, Turbo-B and Thermoexcel-E square surfaces of 9.53 ㎜ length. HTCs are taken from 10 ㎾/㎡ to critical heat flux for all surfaces. Test results show that critical heat fluxes(CHFs) of all enhanced surfaces are greatly improved as compared to that of a plain surface. CHFs of water on the 26 fpi low fin surface, Thermoexcel-E surface, and Turbo-B are increased up to 320%, 275%, and 150% as compared to that of the plain surface, respectively. CHF of the Turbo-B enhanced surface is lower than that of the 26 fpi low fin surface due to the surface geometry. The heat transfer enhancement ratios of the Thermoexcel-E surface, low fin surface and Turbo-B enhanced surface are 1.6~2.9, 1.6~2.1, 1.4~1.7 respectively in the range of heat fluxes tested. Judging from these results, it can be said that these types of enhanced surfaces can be used in heat transfer applications at high heat fluxes.
아시아인프라투자은행(AIIB)과 아시아개발은행(ADB)의 경쟁과 공존 - ASEAN 개발도상국 인프라를 중심으로
이요한 ( Lee Yohan ) 한국외국어대학교 동남아연구소 2018 東南亞硏究 Vol.28 No.2
The launch of China-led Asian Infrastructure Investment Bank (AIIB) has potentially forced competition between US-led World Bank (WB) and Japan-led Asian Development Bank (ADB) leading the global financial market, the forerunner of Asian infrastructure development. As China has become the role of international finance in line with G2 status, its first front line is likely to be an infrastructure market in Southeast Asia, especially led by the ADB. Geographically or geopolitically, Southeast Asia is not only a key region for China's advance into the ocean, but also for the demand of large-scale infrastructure projects. This study focuses on the essential aspects of expanding the diplomatic role and influence of countries including Southeast Asia, more than simple expanding infrastructure funding, which is the outward appearance of the AIIB. It also examines the current situation and limitations of the ADB Programs in Southeast Asian developing countries and discusses on the possibility of coexistence and contradiction of Southeast Asian infrastructure development since the launch of AIIB. In addition, it is inevitable that structural competition between the ADB and the AIIB, but also necessary to coexist matter-of-course with the development of Southeast Asian infrastructure.
이요한 ( Yohan Lee ) 한국외국어대학교 글로벌정치연구소 2015 글로벌정치연구 Vol.8 No.2
풍부한 사회경제적 자원을 보유한 메콩 유역(MRB)의 거대한 잠재력이 주목 받음에 따라 미국, 중국, 일본과 같은 주요 강대국은 메콩 지역과의 긴밀한 협력과 제도적 거버넌스를 구축하기 위해 노력하고 있다. 한국 또한 메콩유역 개발에 참여하고 있으며, 2011년부터 한국-메콩 연례 장관회의를 시작하는 등 한국-메콩 관계를 증진시키기 위해 다양한 노력을 시도하고 있다. 본 논문은 미국, 중국, 일본 등 주요국의 대 메콩 정책과 전략을 살펴보고 한국의 대 메콩 정책에 대한 고찰과 왜 그리고 어떻게 한국이 현재의 메콩 유역에 대해 참여해야 하는지 설명하고자 한다. 또한 외교적, 경제적 한국-메콩 협력에 대한 상호적중요성과 기대 효과를 논하고자 한다. 본 연구는 메콩 유역에서 다른 주요 강국과 차별화된접근과 전략적 포지셔닝을 취할 필요가 있음을 결론으로 맺고자 한다. As the Mekong River Basin (MRB) was increasingly regarded as a huge potential with abundant socio-economic resources and a core geo-political place, major power states such as the United States, China, and Japan have sought for the close relationship and multilateral governance with the Mekong region. Korea is also taking part in MRB development, embarking on various efforts to promote the Korea-Mekong relationship including the annual Korea-Mekong Foreign Ministers meeting started from 2011. This article looks at the approach and strategic positioning of Korea towards the MRB, it seeks to explicate why and how Korea has involved in the MRB issues under current geo-politic and economic circumstances. It also examines the mutual significances and expectations of the Korea-Mekong cooperation in terms of the diplomatic and economic approaches. This study draws out the conclusion that Korea needs to make differentiated approach and strategic positioning itself from other major states in the MRB.
이요한(Yohan Lee) 한국과학기술실용화학회 2023 과학기술융합연구 Vol.2 No.1
산업 및 기술환경의 급변으로 산업 전반의 가치사슬 변화가 확산되고 있다. OLED, 폴더블폰, 미래차(전기차, 자율주행차 등) 등 최근 산업 패러다임이 급변하면서 산업 전반의 가치사슬 변화가 불가피해지고 있는 상황이다. 전기차의 경우 내연기관차(2만 ~ 2만 5,000개) 대비 약 1만개 정도 부품수가 적은 편이며, 산업 가치사슬 내 다양한 기술영역의 결합으로, 기존 특정 분야 중심에서 기계, 전기, 전자, 통신, 소프트웨어, 소재 등 산업 내 관련 분야 또한 다변화되고 있다. 본 논문에서는 대표적인 공급망 업종인 자동차 산업을 사례로 분석하여 경쟁력 분석에 필요한 이론적 근거와 방법론을 제시해 보고자한다. 또한 향후 다양한 산업 가치사슬의 전략적 활용과 경쟁력 분석을 통해 산업경쟁력 제고에 필요한 정책진단 도구로 발전할 수 있는 수 있도록 시사점과 한계를 제시하고자 한다. Rapid changes in the industrial and technological environment are driving value chain transformation across industries. OLED, foldable phones, future vehicles (electric trains, autonomous vehicles, etc. trains, autonomous vehicles, etc.), The recent industrial paradigm is rapidly changing, and changes in the value chain across industries are becoming inevitable. industry-wide value chain changes are becoming inevitable. Electric vehicles have about 10,000 fewer parts than internal combustion engine vehicles (20,000 to 25,000), and as a combination of various technology areas in the industrial value chain, the industry has shifted from centering on specific fields to focusing on mechanical, electrical, electronic, communication, software, and materials. This paper presents the theoretical basis and methodology for competitiveness analysis by analyzing the automobile industry, a representative supply chain industry, as a case. Also In the future, it will be developed as a tool for policy makers to enhance industrial competitiveness through strategic utilization of various industrial value chains and competitiveness analysis. In addition, we will present current issues and limitations so that it can be developed as a tool for policy makers to improve industrial competitiveness through strategic utilization of various industrial value chains and competitive analysis.
Thermoexcel-E 촉진 표면에서 임계 열유속까지의 분무 냉각 열전달 특성
이요한(Yohan Lee),홍광욱(Gwang-Wook Hong),이준수(Jun-Soo Lee),정동수(Dongsoo Jung) 대한설비공학회 2016 설비공학 논문집 Vol.28 No.9
Spray cooling is a technology of increasing interest for electronic cooling and other high heat flux applications. In this study, heat transfer coefficients (HTCs) and critical heat fluxes (CHFs) are measured on a smooth square flat copper heater of 9.53×9.53 ㎜ at 36℃ in a pool, a smooth flat surface and Thermoexcel-E surfaces are used to see the change in HTCs and CHFs according to the surface characteristics and FC-72 is used as the working fluid. FC-72 fluid has a significant influence on heat transfer characteristics of the spray over the cooling surface. HTCs are taken from 10 ㎾/㎡ to critical heat flux for all surfaces. Test results with Thermoexcel-E showed that CHFs of all enhanced surface is greatly improved. It can be said that surface form affects heat transfer coefficient and critical heat flux.