• 기술혁신연구
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• 제22권4호
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• pp.145-164
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• 2014

미래의 궁극에너지로 인식되고 있는 핵융합에너지 개발을 위해서는 DEMO라는 최종 실증 단계를 거쳐야만 한다. 특히 중국, EU, 일본 등의 주요 국가는 DEMO 건설에 대한 구체적 계획을 수립하고 이를 실행 중에 있다. 한국도 1995년부터 KSTAR 사업을 시작으로 핵융합 연구개발에 착수한 점을 감안하면, 핵융합에너지 상용화라는 최종 목표달성 뿐만 아니라, 주요 국가와 DEMO 경쟁 상황에서 주도권을 확보하기 위한 본격적 연구개발이 필요하다. 이에 본 논문에서는 DEMO 개발을 위한 핵심기술을 파악하기 위하여 준정량적 방법론을 적용, 해당 분야의 핵심기술을 도출함으로써 우선적으로 연구개발이 필요한 기술을 식별하여 향후 연구개발 추진시 기술별 우선순위를 제안하고자 한다. 이를 위한 핵융합 에너지 개발과 관련하여 핵융합의 과학적 원리, 주요국가의 DEMO 개발 동향 등을 파악한다. 다음으로 핵융합 실증로와 관련된 기술분류 체계를 검토하여 분석할 기술분류 체계를 선정한다. 선정된 기술체계에 준정량적 방법론으로 기술수준(TRL)을 파악하고 이를 보완하기 위하여 분석적 계층화 과정(AHP)을 적용한다. TRL과 AHP의 결과를 종합하여 우선적으로 확보해야 할 핵융합 실증로의 핵심기술은 실증로용 연소 플라즈마 기술, 대면재료기술, 구조재기술, 고주파 가열장치 기술, 중성입자빔 장치기술, 안전기술, 연소플라즈마 진단장치기술, 핵융합로 시뮬레이터기술 등으로 나타났다.

• Nuclear Engineering and Technology
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• 제40권1호
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• pp.87-92
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• 2008

Tokamak reactor system analysis code was developed at KAERI (Korea Atomic Energy Research Institute) and is used here for the conceptual development of a DEMO reactor. In the system analysis code, prospects of the development of plasma physics and the relevant technology are included in a simple mathematical model, i.e., the overall plant power balance equation and the plasma power balance equation. This system analysis code provides satisfactory results for developing the concept of a DEMO reactor and for identifying the necessary R&D areas, both in the physics and technology areas for the realization of the concept. With this system analysis code, the performance of a DEMO reactor with a limited extension of the plasma physics and technology adopted in the ITER design. The main requirements for the DEMO reactor were selected as: 1) demonstrate tritium self-sufficiency, 2) generate net electricity, and 3) achieve a steady-state operation. It was shown that to access an operational region for higher performance, the main restrictions are presented by the divertor heat load and the steady-state operation requirements.

• 대한건축학회논문집:계획계
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• 제36권3호
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• pp.49-58
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• 2020

Based on Merrill's instructional theory, this study pursued to develop a demonstration-based architectural design class operation model for the 3^rd year undergraduate students taking a Spring semester design studio class. The model was designed and used particularly to improve architectural thinking abilities of under-motivated learners. Learning effects of the model were examined based on the preliminary data obtained for 3 consecutive years, 2017 through 2019. A total of 52 students were participated in the class and observed by the instructor. Once developed, the model has been continually updated and improved based on results of each class operation. Five types of demo. were used in the model. First, direct contacts of the instructor with under-motivated learners were turned out to be the most preferred demo(demo. 4), while watching and listening of the demo(demo.3) between the instructor and motivated learners taking place in class was ranked at the second place. Belief of under-motivated learners on the instructor as a professional should be highly valued for improving their architectural thinking abilities. Second, motivated peers' direct help for under-motivated ones was placed in the third rank. Social attitudes of under-motivated learners towards accepting motivated ones' helps were determined the particular demo's appropriateness. Third, a set of guidelines for operating the model in undergraduate design studio classes were developed and suggested.

• Journal of Radiation Protection and Research
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• 제37권2호
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• pp.63-69
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• 2012

The second phase of the national program for fusion energy development in Korea starts from 2012 for design and construction of the fusion DEMO reactor. Radiological assessment for the fusion reactor is one of the key tasks to assure its licensability and the starting point of the assessment is determination of the source terms. As the first effort, the activities of the coolant due to activated corrosion product (ACP) were estimated. Data and experiences from fission reactors were used, in part, in the calculations of the ACP concentrations because of lack of operating experience for fusion reactors. The MCNPX code was used to determine neutron spectra and intensities at the coolant locations and the FISPACT code was used to estimate the ACP activities in the coolant of the fusion DEMO reactor. The calculated specific activities of the most nuclides in the fusion DEMO reactor coolant were 2-15 times lower than those in the PWR coolant, but the specific activities of $^{57}Co$ and $^{57}Ni$ were expected to be much higher than in the PWR coolant. The preliminary results of this study can be used to figure out the approximate radiological conditions and to establish a tentative set of radiological design criteria for the systems carrying coolant in the design phase of the fusion DEMO reactor.

• 한국가스학회:학술대회논문집
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• 한국가스학회 2005년도 춘계학술대회 및 특별심포지움
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• pp.232-232
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• 2005

• 한국가스학회:학술대회논문집
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• 한국가스학회 2005년도 추계학술발표회 논문집
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• pp.141-145
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• 2005

DME (Di-Methyl Ether) is a new clean fuel and an environmental-friendly energy resource, also is recently increasing with an alternative interest because of the industrial use. DME has been shown to have excellent properties as a diesel fuel giving emission level better than ULEV standard. So it has been attracting considerable as an alternative diesel fuel. In this study, we carried out simulation of separation and purification process of demo plant for 101on per day DME production, which cause the effect that is important in productivity, from operation results of pilot plant for 50kg per day DME production. The liquefied stream, which was separated by gas-liquid separator after DME reactor, includes $CO_2$, DME, Methanol and $H_2O$. We established three distillation columns for separation and purification of the stream. $CO_2$ was extracted from the stream by first distillation column, DME was extracted by second column and Methanol was extracted by third column. We investigated and analyzed the effect which the actual operation variables cause in efficiency of process and optimized process, finally we got the DME of purity $100\%$.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2013년도 제45회 하계 정기학술대회 초록집
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• pp.179.2-179.2
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• 2013

A large-area RF-driven ion source is being developed at Germany for the heating and current drive of ITER device. Negative hydrogen ion sources are major components of neutral beam injection (NBI) systems in future large-scale fusion experiments such as ITER and DEMO. The RF sources for the production of positive hydrogen ions have been successfully developed at IPP (Max-Planck-Institute for Plasma Physics), Garching, for the ASDEX-U and W7-AS neutral beam heating systems. Ion sources of the first NBI system (NBI-1) for the KSTAR tokamak have been developed successfully with a bucket plasma generator based on the filament arc discharge, which have contributed to achieve a good plasma performance such as 15 sec H-mode operation with an injection of 3.5 MW NB power. There is a development plan of RF ion source at the KAERI to extract the positive ions, which can be used for the second NBI system (NBI-2) of the KSTAR and to extract the negative ions for future fusion devices such as Fusion Neutron Source and Korea-DEMO. The development progresses of RF ion source at the KAERI are described in this presentation.

• 한국대기환경학회:학술대회논문집
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• 한국대기환경학회 1999년도 춘계학술대회 논문집
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• pp.35-36
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• 1999

• 한국생활과학회지
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• 제8권1호
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• pp.81-93
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• 1999

Now in Korea, many households are facing with economic crisis. The study based on the premise that household economic status could keep as stable as before economic crisis depending on the coping behavior of housewives as a manager of household. The purpose of this study was to find the coping behavior patterns with economic crisis of housewives, and to examine the socio-demo-economic factors which influence the coping behavior with economic crisis of housewives. Major findings were as follows; (1) The principal two patterns of coping with economic crisis were active coping behavior and passive coping behavior. (2) The most frequently used coping behavior pattern was passive coping behavior. (3) The patterns of coping with economic crisis were influenced by the socio-demo-economic factors.

• 한국콘텐츠학회논문지
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• 제11권12호
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• pp.1-11
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• 2011

어플리케이션의 시연은 일련의 상호작용을 포함하기 때문에 많은 시간이 소요된다. 어플리케이션을 시연해야 한다면 통상적으로 발표 세션과 별도로 시연 세션을 진행한다. 하지만, 모바일 단말기를 조작하여 무선으로 어플리케이션을 시연한다면 발표자가 직접 시연을 주도적으로 진행함으로써 전달하고자 하는 메시지를 효과적으로 전달할 수 있을 것이다. 이러한 시연 방법은 기존 모바일 단말기의 성능과 화면 크기의 제약 때문에 구현이 불가능하였다. 우수한 성능과 다양한 기능을 갖춘 스마트폰의 등장으로 스트림 동영상을 실시간으로 그리고 상대적으로 큰 모바일 단말기 화면에서 재생할 수 있고, 또한 시연자가 모바일 단말기 화면의 어플리케이션 영상을 보면서 어플리케이션을 직접 제어할 수 있기 때문에 새로운 시연 방법의 구현이 가능해졌다. 본 논문은 스마트폰을 활용한 모바일 기반 시연 시스템인 '스마트 데모(Smart Demo)'의 설계와 구현에 대해 기술하고자 한다.