• Proceedings of the Korean Nuclear Society Conference
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• 1996.11b
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• pp.711-716
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• 1996

발전소 정상운전 및 정지기간 중 2차측 급수를 통하여 증기발생기 안으로 불순물이 유입되며, 운전중에 과열도가 높은 중기발생기 세관과 튜브쉬트등의 틈새에는 불순물의 농축도가 심해지며 이로인해 전열관이 부식손상을 입는다. 잠복불순물은 출력감발 및 정지기간 중에 증기발생기 급수의 냉각에 따라 불순물의 용해도차로 인해 재방출된다. 본 연구에선 89년부터 94년사이에 행하여진 원전 현장의 잠복불순물 방출시험자료를 이용하여 데이터베이스를 작성하였으며, 이중의 일부를 입력자료로 사용하여 Framona 전산코드작업을 수행한 결과 틈새의 pH 변화를 년도별로 비교할 수 있었다. 비교결과 년도가 지날 수록 증기발생기의 틈새에서의 pH는 낮아짐을 볼 수 있었으며 현장의 년도별 증기발생기 세관 관막 음수 증가 경향과 잘 일치하였다.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.35 no.10
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• pp.1075-1081
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• 2011

A leak-detection method has been developed by measuring the pressure variation between the inner and outer heattransfer tubes of a double-wall tube steam generator. An experiment was carried out to measure the leak rate in the gap between two surfaces pressed with a hydraulic press in order to simulate the phenomena, and a correlation was determined for the leak rate in a micro gap. However, in the correlation, the gap width and friction coefficient were coupled with the surface roughness, which affects the two parameters. The two parameters were separated using a surface-contact model to develop a correlation for the friction coefficient. The correlation was compared with the existing correlations used for crack analysis. Although the applied ranges of Reynolds numbers were different, the developed correlation for Reynolds numbers of 0.1.0.35 showed similar tendencies to existing correlations used for higher Reynolds numbers.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2023.05a
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• pp.147-148
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• 2023

Steel doors, which are common in general buildings, do not seal the gap between the door and the floor, so drafts, noise, dust, and lights flow from the outside, and shielding devices are installed in various materials and methods, such as adding magnetic gate paper to the side of the door or installing a gasket under the door, but performance is limited. Accordingly, in order to fundamentally solve these problems, we researched and developed a double gap blocking device that can improve fire resistance and airtightness performance in steel doors. Unlike general products, the double gap blocking device has the advantage of maximizing airtight performance by forming an air layer in the center when the door is closed, as well as greatly improving the fire resistance performance, which is the basic performance of the fire door.

• Journal of Bio-Environment Control
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• v.22 no.3
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• pp.270-278
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• 2013

The objective of the present study is to provide data needed to decide covering method to be able to increase the thermal insulation and light transmittance efficiency of commercial greenhouse. The thermal insulation effect, PPF transmittance and quantity of condensation water were estimated in experimental tomato greenhouses covered with three types of coverings of single layer, air inflated and conventional double layers covering. The overall heat flow of air inflated double layers greenhouse was similar to that of conventional double layers greenhouse, but the temperature between covering material and thermal screen in air inflated double layers greenhouse was lower than that in conventional double layers greenhouse at the same outside temperature condition due to air leakage through the gap of roof vent. The overall heat transfer coefficients acquired by experiment that was performed in single layer and conventional double layers greenhouses were close to those obtained from model experiment. Even though the PPF transmittance of air inflated double layers greenhouse was lower than that of single layer greenhouse, which was greater than that of conventional double layers greenhouse. The quantity of condensation water on covering surface of single layer greenhouse was greater than that of air inflated double layers greenhouse due to lower covering surface temperature.

• VENDING MACHINE INDUSTRY
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• no.summer
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• pp.83-85
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• 1999

인구 10억이 넘는 중국시장은 국내 자판기 산업의 해외시장 개척에 있어 정말 매력적인 시장으로 보여 진다. 그 엄청난 시장확대력, 서서히 도입되기 시작하는 자판기 문화 등의 요인을 고려할 때 수출시장 활성화의 가능성은 어느 지역보다 높아 보인다. 그런 까닭에 국내 대기업들도 이 중국시장에 많은 관심을 가지고 시장진출을 노리고 있고, 일부 오버홀 업체나 유통업체들을 중심으로는 이미 오래 전부터 중고자판기에 대한 수출이 부분적으로 나마 진행되어 왔다. 그러나 이같은 상황에도 불구하고 중국시장은 여전히 가능성의 시장으로만 남아 있다. 세부적으로 중국시장 개척을 진행해 보면 생각했던 것만큼 시장개척이 이루어지기 힘든 요소가 너무도 많다는 것을 깨닫게 되기 마련이다. 이중 특히 문제가 되는 것은 중국의 전통적인 차문화이다. 전통차 문화가 뿌리깊은 중국에서는 커피음용문화가 아직은 정착되기 힘든 현실에 있다. 따라서 자판기 수출의 가장 주력기종이 되어야 할 커피 및 복합형 제품이 중국시장 개척을 진행하기란 결코 쉽지 않다. 커피가 상류층 기호식품으로 인식되는 중국시장에 있어 커피자판기 시장은 아직은 시기상조로 여겨지고 있는 것이다. 그런데 최근 중국시장에 있어서는 커피의 소비량이 미약하게나마 확대되고 있는 추세에 있어 커피 시장확대에 대한 기대를 머금게 만들고 있다. 금호에서는 식품음료신문의 협조를 얻어 전통차의 나라 중국시장에 있어 틈새시장 공략을 가속화하고 있는 커피시장의 동향을 조명해 보았다.

• Proceedings of the Korean Nuclear Society Conference
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• 1998.05b
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• pp.225-230
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• 1998

DUPIC 핵연료 소결체의 하나로 조사시험과 관련하여 이중 피복관으로 구성된 소결체 설계를 수행하였으며 각각의 설계변수가 핵연료의 온도에 미치는 영향하였다. 하나로에서 조사할 DUPIC 핵연료의 설계해석 결과, DUPIC 핵연료의 조사시험시 열전도도, 출력, 반경 틈새 등은 핵연료의 온도에 크게 영향을 미쳤으며, 피복재 두께, gamma열, 열전달 계수 등은 핵연료의 온도에 크게 영향을 미치지 않았다. Transient 온도분석의 경우 약 160초 이상의 시간에서 평형 온도에 도달할 것으로 분석되었다.

• Archives of design research
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• v.19 no.4 s.66
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• pp.205-208
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• 2006

This work is a interactive digital art work which used the multiplex of jitter. It is an work which used a cross concept of two images. This work shows two kinds of images. One is on the wall through the gap of fluorescent lamp screen, and the other is on the fluorescent lamp screen. Two images are intercepted and comes out to the length as the multiplex of the jitter. The appearance of the spectator be recognized on the fluorescent lamp screen or on the wall, by two branch image which comes out intersecting of a length with multiplex function of the jitter. Two branch features of the image which it produces and the spectator which is input at real-time is equally divided, or in impression of juxtaposition goes in the spectator. It expresses the duplicity of the human being, with physical existence space divides the time space which we feel and there is a governing grammar which is different with each other and to express the thing it becomes. It used the image of the screen which it produces with the fluorescent lamp and cross concept.

• International Area Studies Review
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• v.15 no.2
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• pp.403-425
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• 2011

Canada became the first OECD/DAC member state that legislated the ODA Accountability Act in 2008, which prescribe Canada ODA policies to meet the guidelines and norms of international human rights while other OECD/DAC member states was just emphasizing the importance of abiding by the international human rights norms. Paying attention to the Canadian case, this article critically examines under what structural environments and process this Act was passed. This article argues that the legislation of the ODA Accountability Act is closely related with Canada's international position as middle power and diplomatic strategies. Bring up the human security issues as a niche market, Canada demonstrates the characteristics of middle power state by emphasizing human rights agenda as new foreign policy strategies. Reflecting on the negative outcomes from neoliberal aid policy of structural adjustment and promoting the new aid norms in post cold war era would also help foster the enabling environment for the value-oriented aid policies and enactment of the Accountability Act. Civil society organizations were also playing catalyst role in constructing Canada's state identity of human rights defender.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2008.11a
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• pp.914-917
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• 2008

This paper was to discuss the case and cause of debonding defect of wood floor board in apartment house by investigating actual survey. Most frequent defect in wood floor board was debonding of floor board. Scratch, gap and crack of floor board were also found in floor board installment work. Causes of debonding of floor board is shrinkage of cement mortar beneath floor board and expansion of floor board. Haste in floor board work did not provide enough time to dry cement mortar fully, which led to continue to dry after the installment of floor board. It caused moisture movement toward wood floor board. Accordingly, Before floor board work, careful consideration on moisture condition of cement mortar and enough curing time to eliminate the effect of moisture are taken into.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.1B
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• pp.94-104
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• 2003

This paper addresses the issue of applying the concept of IT everywhere IT inside to R&D planning system We investigate R&D planning system, mid term IT technology development plan, and the fact and outlook of wireless communications technology in Korea and also focus o deriving core wireless telecommunications technologies and priority setting under R&D planning system, using Analytic Hierarchical Process.