• 한국수산과학회지
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• 제18권3호
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• pp.271-277
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• 1985

외톨개모자반의 재생장에 미치는 식물호르몬의 효과를 조사하기 위하여 제1측지에서는 생식기탁이 형성중인 정단부위와 정단에서 30mm 떨어진 하위부, 그리고 제 2측지에서는 정단에 서 5 mm하위부인 3부분에서 절편을 취하여, PESI를 기본배지로 하고 2,4-D, kinetine, NAA 그리고 IAA의 mole 농도별 용액에서 60 일간 배양하였다. 1. 식물호르몬의 재생장에 미치는 유효농도는 $10^{-5}M{\sim}10^{-8}M$이며 조해농도는 $10^{-3}M{\sim}10^{-4}M$이었다. 2. 제1측지의 재생장효능은 kinetine $10^{-8}M$, 2,4-D, $10^{-5}M$, NAA $10^{-6}M$ 그리고 IAA $10^{-6}M$ 순이었다. 3. 제2측지의 재생장효능은 NAA $10^{-6}M$, kinetine $10^{-8}M$, IAA $10^{-6}M$ 그리고 2,4-D $10^{-5}M$ 순이었다. 4. 제1측지와 제2측지의 순재생률에서 최대치는 각각 kinetine $10^{-6}M(157.3\%)$과 NAA $10^{-6}M(447.2\%)$이었고, 대조에서도 $124.1\%$와 $228.9\%$로 재생효능은 제2측지가 높았다. 5. 제2측지 절편에서 재생분지한 돌기는 모두 생식기탁으로 분화하였다. 6. 생식기탁 절편은 배양 $20{\sim}30$일 사이에 재생분지한 소지가 전부 생식기탁으로 성장하여 생란기를 형성하였고 40 일 후부터는 방란후 소실하였다.

• Tribology and Lubricants
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• 제22권6호
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• pp.329-334
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• 2006

In CNG (Compressed natural gas) fuel supply line, whose main components are receptacle and check valve are used to charge high pressure gas to the tank of NGV (Natural gas vehicle). It is reported that the seal is separated occasionally form valve seat and results in blockage of gas flow. In this paper, MARC is used to investigate the reasons of seal separation and suggest design improvements. The static gas pressure distributions acting on the seal which calculated using FLUENT are considered to investigate accurate seal deformation behaviors. Deformed seal shapes are obtained for various amounts of seal interference and its location, gas pressure distributions and Young's modulus of the rubber used. The results showed that the reasons of seal separation problems are verified theoretically, and suggested examples of new design method. Therefore the present numerical methods can be applied in designing and performance analysis of rubber seals adopted in high pressure fluid machineries.

• ALGAE
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• 제26권3호
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• pp.253-263
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• 2011

Phenotypic plasticity was examined in the economically and ecologically important brown alga Ascophyllum nodosum in southwestern Nova Scotia, considering specifically how nutrient loading affected its vegetative and reproductive features. To determine this, we examined morphometric changes in A. nodosum from two sites receiving direct effluent impacts from a land-based finfish aquaculture facility and from two control sites, approximately 2 km away from the aquaculture facility in opposite directions. Fronds from test sites were significantly younger than from control sites (5 y vs. 8 y); however, fronds from farm sites were significantly larger (219 g vs. 90 g) because of their higher growth rates. Thalli from farm sites had greater reproductive potential, as shown by numbers of receptacle initials (797 initials vs. 281 initials). These results suggest limited nutrient inflows from land-based aquaculture may positively affect adjacent Ascophyllum populations by inducing higher growth rates. We conclude that the coordination of effluent management from land-based aquaculture with natural resource harvesting of A. nodosum may be beneficial. Further study is necessary to determine the limits of nutrient loading for this potentially beneficial outcome.

• 조명전기설비학회논문지
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• 제21권9호
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• pp.57-63
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• 2007

The occurrence of a corona is that electrical discharge due to the heterogeneity that occurs when an electrical field is concentrated in an electrode due to a cusp formed on said electrode. Wire treatment at the end of a 154[kV] dead end clamp for end users accelerates the occurrence of corona, which in turn leads to power loss and noise. In this study, the characteristics of the corona which occurs between porcelain insulators and support clamps of overhead lines used in 154[kV] power receiving facilities for end users were investigated. The corona, which cannot be identified by one common method, was measured utilizing a UV image camera. A risk assessment for fire damage and its status was suggested. The stress distribution of the electrical field by length of bare wire was suggested by means of the finite element method(FEMLAB). As a result, it was found to affect a porcelain insulators. These results can be utilized for the enhancement of clamp installation and safety in power facilities.

• 한국가구학회지
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• 제20권6호
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• pp.581-589
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• 2009

Under 'The Design Street' Project, one of the urban environment improvement projects of Seoul, the facilities on the street have been greatly varied in terms of design. In addition, the municipal authority has pushed each district to develop its own identity based on the integrated design of the city. This study was aimed to propose a design which could solve the current problem in street furniture in terms of environmental improvement through an analysis on current street conditions in "Y" District as a part of Seoul Design Street Project. It has attempted to propose 11 street furnitures based on the basic strategy of 'Soft City' which has been promoted by Seoul City in accordance with the Seoul Public Facility Guidelines as 1. Airy Design, 2. Integrated Design, 3. Collaborative Design and 4. Sustainable Design. Among them, for the total design in Seoul six facilities - kiosk, manhole, traffic signal controller, public phone, road sign and waste receptacle were proposed by Seoul City have been accepted. For local differentiation, on the contrary, five items - planter bench, bollard, lifter, bike rack and fence have been newly designed and proposed. Furthermore, it is essential to carry out systematic supervision and continuous management on the detail design and construction of current regional design development projects.

• 방사성폐기물학회지
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• 제7권1호
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• pp.49-62
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• 2009

사용후핵 연료 관리 정책 결정 에 있어 사회적 수용성은 중요한 의미를 갖는다. 본고에서는 그 역동적 과정을 담아낼 그릇으로서 공론장을 제안한다. 즉, 사용후핵 연료 관리 정책에 대한 공론장은 무엇이고, 공론장의 주체인 이해관계자들은 누구이며 또 공론장에 내재된 갈등구조는 어떠한지에 대해 살펴보고, 바람직한 공론장의 조건에 대해 논의한다. 공론장은 다양한 이해관계자와 시민이 스스로의 의지를 바탕으로 정책의 결정과정에 영향을 미칠 수 있는 기제와 제도를 의미한다. 현실성 있고 효과적인 공론장을 구축하고 운영하기 위해서는 사용후핵 연료 관리를 둘러싼, 정치, 외교안보, 경제, 사회문화, 법과 제도에 관한 면밀한 분석과 대응방안 마련이 필요하다.

• 대한화학회지
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• 제36권5호
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• pp.753-759
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• 1992

흰 무궁화꽃의 씨방을 이용하여 Tissue electrode를 제조하고, L-arginine을 정량하기 위한 최적조건을 조사한 결과 0.1M phosphate 완충용액에서 pH 8.0, 온도 $25^{\circ}C$, 조직두께 $20 {\mu}m$이었을 때이며, 이에 정량 가능한 직선범위는 $5.0 {\times} 10^{-3}M $∼ $1.0 {\times} 10^{-1}M$이었으며, 감응도는 54.0 mV/decade로 나타났고, 감응시간은 7∼8분이 소요되었다. $K_m$값은 $6.4 {\times} 10^{-6}(M)$이다.

• ALGAE
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• 제26권4호
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• pp.327-331
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• 2011

An analysis of the vegetative and reproductive anatomy of Sargassum lapazeanum was performed based on extensive sampling in three areas within its geographical range: a) San Juan de la Costa, b) Punta Calera, c) Punta Machos. Material was collected from low intertidal to subtidal populations and evaluated based on variations present within and between populations. Our goal was to comprehensively analyze the features of the vegetative and reproductive anatomy of this species. Our observations showed that this species has cauline, which is anatomically composed of three tissues layers. This species is dioic, with male and female conceptacles in the same receptacle but with different maturation times. The present study confirmed the presence of cauline in this species; this structure was previously described for some species in the Gulf of California, such as Sargassum horridum, and for several species in Japan. This structure could be responsible for the growth of primary branches and may also generate a new plant. This trend might explain the perennial nature of this species at the population level. Field and laboratory experiments could help to delimit the ecophysiological conditions under which this structure starts to develop.

• 식물조직배양학회지
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• 제25권5호
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• pp.319-322
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• 1998

여러 계통의 고추(Capsicm annuum L.)의 약을 이용하여 식물체 재분화 조건을 확립하였다. 꽃받침 위로 꽃잎이 2mm 올라온 미성숙 화뢰에서 상부로부터 절반 이하로 착색된 약을 채취하여 0.1mg/L 2,4-D와 0.1mg/L kinetin이 첨가된 Dumas 고체배지에 치상하였다. 배양 4주후부터 배가 발생하였으며, 8주후의 배발생 빈도는 최고 58.3%였다. 배는 MS 기본배지로 옮겨주었을 때 95이상이 발아하여 식물체로 재분화되었다.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2005년도 동계학술발표대회 논문집
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• pp.179-185
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• 2005

Nowadays, study about hydrogen fuel which consist of hydrogen extraction process, reforming, fuel cell equipment, and receptacle are flourish all over the world. Currently, Korea hydrogen station is still underdevelopment. Yet the most important part such as hydrogen compressor has not been develop. Therefore, if the high pressure compressor for hydrogen have been developed by domestic technology. In the future many benefit can be gain instead of importing. Such as many hydrogen station can be built in Korea, and also Korea will be able to provide hydrogen system for worldwide. This study is going to analysis hydrogen compressor in order to store high pressure hydrogen. This is almost approach practical use of tile hydrogen storage method.