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병렬 배치된 FLBT 및 LNG-BS에 작용하는 풍하중 및 조류하중에 대한 풍동 시험 및 경험식 비교 연구
박병원(Byeongwon Park),정재환(Jae-Hwan Jung),황성철(Sung-Chul Hwang),조석규(Seok-Kyu Cho),정동호(Dongho Jung),성홍근(Hong Gun Sung) 한국해양공학회 2017 韓國海洋工學會誌 Vol.31 No.4
In recent years, LNG bunkering terminals are needed to supply LNG as fuel to meet the emission requirements of the International Maritime Organization (IMO). A floating LNG bunkering terminal (FLBT) is one of the most cost-effective and environmentally friendly LNG bunkering systems for storing LNG and transferring it directly to an LNG fuel vessel. The FLBT maintains its position using mooring systems such as spread mooring and turret mooring. The loads on the vessel and mooring lines must be carefully determined to maintain their positions within the operable area. In this study, the wind loads acting in several side-by-side arrangements on the FLBT and LNG-BS were estimated using wind tunnel tests in the Force Technology, and the shielding effect due to the presence of ships upstream was evaluated. In addition, the empirical formulations proposed by Fujiwara et al. (2012) were used to estimate the wind force coefficients acting on the FLBT and those results were compared with experimental results.
Terahertz time domain spectroscopy of GdBCO superconducting thin films
Ji, Gangseon,Park, Woongkyu,Lee, Hyoung-Taek,Song, Chang-Yun,Seo, Choongwon,Park, Minjo,Kang, Byeongwon,Kim, Kyungwan,Kim, Dai-Sik,Park, Hyeong-Ryeol The Korea Institute of Applied Superconductivity a 2019 한국초전도저온공학회논문지 Vol.21 No.1
We present terahertz optical properties of $GdBa_2Cu_3O_{7-x}$ (GdBCO) superconducting thin films. GdBCO films with a thickness of about 105 nm were grown on a $LaAlO_3$ (LAO) single crystal substrate using a conventional pulsed laser deposition (PLD) technique. Using an Ar ion milling system, the thickness of the GdBCO film was reduced to 58 nm, and its surface was also smoothened. Terahertz (THz) transmission spectra through two different GdBCO films are measured over the range between 0.2 and 1.5 THz using THz time domain spectroscopy. Interestingly, the THz transmission of the thinner GdBCO film has been increased to six times larger than that of the thicker one, while the thinner film is still maintaining its superconducting property at below 90 K.
글로벌 충격에 대응하는 과학기술 다자협력 전략: 유엔시스템을 중심으로
신은정(Eunjung Shin),박환일(Hwanil Park),박병원(Byeongwon Park),성경모(Kyung-Mo Sung),박동운(Dongun Park),장용석(Yongsuk Jang),장진규(Jin Gyu Jang),권소현(So Hyun Kwon),김지은(Ji Eun Kim),최동주(Dong Ju Choi),김진하(Jinha Kim),오채운(Ch 과학기술정책연구원 2021 정책연구 Vol.- No.-
This study was designed to develop multilateral STI (Science, Technology and Innovation) cooperation strategies in response to the global shocks that we are currently experiencing and that may arise in the future. To this end, this paper first investigated the development of multilateral STI cooperation centered on the United Nations system (UN system), and then surveyed UN system’s response to global shocks such as COVID-19. The key findings of this study are summarized as follows. First, STI cooperation in the UN system has been continuously promoted as a means of achieving international security and development since the establishment of the UN. Security-related STI cooperation has been mainly discussed at the Security Council and the UN General Assembly, and the Related Agencies, such as IAEA, CTBTO, and OPCW, have been also playing a key role. Moreover, STI cooperation for development has been heavily discussed at the Economic and Social Council including CSTD and ESCAP, and Specialized Agencies such as ITU, UPU, IMO, WMO, UNESCO, WIPO, and WHO have also played a significant role for STI cooperation. Furthermore, policy agendas related to innovation, sustainable development, and digital technology have been increasingly emphasized for STI cooperation within the UN system these days. Recently developed organizations, such as the Technology Facilitation Mechanism (TFM) for Sustainable Development, and UNFCCC, are dealing with these emerging needs for STI cooperation. Second, the United Nations system has evolved to respond to global shocks. It has broadened the scope of cooperation in response not only to global security risk but also to economic and financial crises. It has further developed multi-lateral cooperation schemes to cope with various environmental emergencies as well as health emergencies. In particular, the UN system has devised and delivered immediate and comprehensive emergency responses in the amid of the recent COVID-19 pandemic. From the beginning of the outbreak, it defined COVID-19 as a complex crises that combine not only health issues but also socio-economic and humanitarian threats and strived to take comprehensive measures. In this process, the following needs for STI cooperation were identified and met: 1) joint research and R&D collaboration for scientific solutions to COVID-19 (treatment, diagnosis, vaccine, and prevention measures), 2) research data and resource sharing for accelerating R&D, 3) digital technology-based assistance to overcome crises, and 4) global consultation and communication based on reliable scientific information and knowledge. The occurrence of global shocks has led to new development of science-policy interfaces in the UN system. In order to fully utilize the newly created STI cooperation opportunities in emergencies, this study proposes to (1) support more STI experts to get engaged in UN cooperation process, (2) increase Korea’s contribution to global joint research and technology cooperation that directly tackle global crises, (3) actively participate in the UN’s system coordination activities and digital cooperation initiatives, and (4) to propose and lead a future STI cooperation agenda, such as crisis response based on future foresight. Furthermore, it is recommended to continuously strengthen Korea’s existing activities for STI cooperation in the UN system. Lastly, although not fully addressed in this study, STI cooperation beyond the UN system is so important that requires further research.