• 한국방사성폐기물학회:학술대회논문집
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• 한국방사성폐기물학회 2017년도 춘계학술논문요약집
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• pp.88-89
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• 2017

• 천문학회보
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• 제44권1호
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• pp.59.3-59.3
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• 2019

Very Long Baseline Interferometry (VLBI) is a special technique which can provide high angular resolutions of milliarcsecond and sub-milliarcsecond sales in radio astronomical observations. Recently, the mm/sub-mm VLBI observations becomes more widely available and related activities are increasing accordingly. In this talk, I'll introduce ongoing global mm-VLBI activities and EHT collaboration and our (Korean) contributions to them.

• Nuclear Engineering and Technology
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• 제46권4호
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• pp.489-500
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• 2014

In this study, remote handling strategies for a large-scale argon cell facility were considered. The suggested strategies were evaluated by several types of field test. The teleoperation tasks were performed using a developed remote handling system, which enabled traveling over entire cell area using a bridge transport system. Each arm of the system had six DOFs (degrees of freedom), and the bridge transport system had four DOFs. However, despite the dexterous manipulators and redundant monitoring system, many operators, including professionals, experienced difficulties in operating the remote handling system. This was because of the lack of a strategy for handling the installed camera system, and the difficulty in recognizing the gripper pose, which might fall outside the FOV (field of vision) of the system during teleoperation. Hence, in this paper, several considerations for the remote handling tasks performed in the target facility were discussed, and the tasks were analyzed based on ergonomic factors such as the workload. Toward the development of a successful operation strategy, several ergonomic issues, such as active/passive view of the remote handling system, eye/hand alignment, and FOV were considered. Furthermore, using the method for classifying remote handling tasks, several unit tasks were defined and evaluated.

• Nuclear Engineering and Technology
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• 제47권6호
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• pp.776-790
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• 2015

Background: The advanced spent fuel conditioning process facility (ACPF) of the irradiated materials examination facility (IMEF) at the Korea Atomic Energy Research Institute (KAERI) has been renovated to implement a lab scale electrolytic reduction process for pyroprocessing. The interior and exterior structures of the ACPF hot cell have been modified under the current renovation project for the experimentation of the electrolytic reduction process using spent nuclear fuel. The most important aspect of this renovation was the installation of the argon compartment within the hot cell. Method: For the design and system implementation of the argon compartment system, a full-scale mock-up test and a three-dimensional (3D) simulation test were conducted in advance. The remodeling and repairing of the process cell (M8a), the maintenance cell (M8b), the isolation room, and their utilities were also planned through this simulation to accommodate the designed argon compartment system. Results and conclusion: Based on the considered refurbishment workflow, previous equipment in the M8 cell, including vessels and pipes, were removed and disposed of successfully after a zoning smear survey and decontamination, and new equipment with advanced functions and specifications were installed in the hot cell. Finally, the operating area and isolation room were also refurbished to meet the requirements of the improved hot cell facility.

• 천문학회보
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• 제41권2호
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• pp.32.3-32.3
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• 2016

Available VLBI sources at high frequencies (e.g. >22GHz) are very limited - mainly due to atmospheric fluctuations that degrade coherence time and a power-law energy distribution of particles in case of AGNs. However, simultaneous multi-frequency VLBI receiving system of the Korean VLBI Network (KVN) and its powerful VLBI phase calibration technique offer benefits in finding more weak sources at millimeter wavelengths. Based on this aspect, multi-frequency AGN survey with the KVN (MASK) project, which aims to densify an existing a VLBI catalog of extragalactic radio sources at 22/43/86/129GHz is proposed as a KVN legacy program. We selected 1220 sources of AGNs that include known VLBI sources and new fringe-detected sources using the KVN at K-band (22GHz). Among them, 138 sources were observed as pilot experiments at 22/43/86/129GHz simultaneously and excellent VLBI detection results are achieved. Therefore, we expect that MASK will open a new era in VLBI science at millimeter wavelengths by providing unprecedented number of available sources in the Universe.

• 역사민속학
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• 제44호
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• pp.7-37
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• 2014

문무왕릉비에는 신라인이 화관의 후손으로 묘사되어 있고, 김유신비에서는 금관국 출신의 김유신이 황제 헌원의 후예이며 소호 금천씨의 후손으로 신라 왕실과 같은 조상의 후손이라고 했다 한다. 두 비의 내용은 서로 연관되어 있다. 그 목적은 김유신가와 무열왕가를 하나로 통합하기 위한 것이었다. 화관은 화정 또는 축융이라고도 하는데 상고시대에 하늘의 대화성(大火星)에 제사를 지내고 불을 담당하는 관리였다. 그런데 그 화관의 임무를 전욱 고양씨의 후손이 담당했다. 그리고 화관 축융의 후손은 은과 춘추시대에 중국 형초(荊楚) 지역에 나국(羅國)을 건설했던 존재이다. 그런데 신라(新羅)는 글자대로 해석하면 '새로운 나국'이 되고, 따라서 신라는 화관의 후예가 세운 나라가 된다. 한편 가야의 금관국은 금관의 나라이다. 가락국은 철로 이름을 널리 알리게 되자 쇠를 다루었던 금관(金官)의 후예를 자처했던 듯하다. 금관 욕수의 임무는 소호 금천씨의 아들 해(該)가 담당했다. 결국 소호 금천씨 설화는 신라가 아니라 금관국의 것이었다. 신라의 화관은 전욱 고양씨의 후손이고, 가야의 금관은 소호 금천씨의 후손인데 전욱과 소호의 공동 조상이 바로 황제 헌원이다. 화관계 신라의 무열왕과 금관계 가야의 김유신은 황제를 연결고리로 해서 한 핏줄로 묶이게 되었다. 김유신비에서 '금(金)'과 아무런 연관이 없는, 사족과 같은 황제 헌원을 언급한 것은 이 때문이다. 그러나 이 내용은 대부분 사실과 거리가 먼 수사적 허구이다. 그러므로 두 가문이 하나로 합쳐져 고착되고 수사적 허구의 목적이 상실된 후로는 시간의 흐름과 함께 잊어져 갔다.