• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.27 no.2
• /
• pp.147-154
• /
• 1982

This study was conducted to investigate an effective method of protoplast isolation, the plating efficiency for cell division, and fusion of plant protoplasts by polyethylene glycol for somatic hybridzation. The effectiveness of protoplast isolation was different with the various enzyme concentrations, but, in the protoplast isolation from tobacco mesophyll, the enzyme solution with 0.5% macerozyme and 2.0% cellulase was very effective. The protoplast isolation from callus cultured in vitro for a long period was not obtained in any of the enzyme solution used. Protoplasts divided actively at cell densities above $10^44/ml and at $25^{\circ}C$ under 12hr illumination by inflorecient light (l50 Lux), regardless of presence of agar. The highest frequency of protoplast fusion was obtained after treatment with a solution of 0.33 M polyethylene glycol 1500.

• Geotechnical Engineering
• /
• v.23 no.10
• /
• pp.34-40
• /
• 2007

• Journal of Korean Association for Spatial Structures
• /
• v.7 no.1 s.23
• /
• pp.63-70
• /
• 2007

To improve the land use of urban, Construction of the circular steel column is required recently. The circular steel columns have a advantage for improving a load carrying rapacity as wall as reducing a effective section area. However, the circular steel columns under service load, such as earthquake, shows a tendency to cause local buckling and large deformation. To prevent these phenomena, use of longitudinal stiffeners is considered. The application of longitudinal stiffeners at the circular steel columns is expected to increase a load carrying capacity, buckling strength and seismic performance of circular steel column. However, increasing the loading carving rapacity of buckling which constructed the longitudinal stiffeners, was not investigated yet. Therefore it needs study on effect of longitudinal stiffener in pipe-section steel pier. In this study, the load rallying capacity of buckling of steel pier was investigated by using elastic-plastic finite element analysis considered geometrical and material non-linearity. Also, this study investigated the effect of longitudinal stiffeners on loading carrying capacity of buckling and the relationship between width and thickness of longitudinal stiffeners. And also, a Influence of longitudinal stiffeners on seismic performance of circular steel columns was investigated by numerical analysis

• Korean Journal of Heritage: History & Science
• /
• v.49 no.1
• /
• pp.178-189
• /
• 2016

This essay explores the ways in which the philosophical concept of "original form" is expressed in relevant laws and regulations, the legal character of respective regulations, the way in which each regulation is applied in practice for heritage management, and the factors required for this concept to serve as a legally binding fundamental principle. The current laws and regulations on heritage maintain a consistent requirement for preserving the original form of heritage, both for the general public and for heritage professionals. However, the principle of preserving original form is expressed as a declaration or imperative without substantive definitions. Consequently, heritage administrators simply follow administrative procedures for heritage conservation, management, and promotion while failing to specify the meaning of "original form." For the practical application of the principle of preserving original form to overall heritage conservation activities as an actual legal principle, further provisions should be added for the purpose of clarifying the principle, with consideration given to the observation of fundamental principles for legal provisions, such as the principles of clarity, equality, and proportion. The principle of preserving original form still functions as the most necessary principle for heritage conservation and therefore should be reestablished as a refined and rational regulatory system.

• The Journal of the Korea Contents Association
• /
• v.16 no.11
• /
• pp.574-583
• /
• 2016

This study discussed how the Moo-hyup prototype that has been formed from novels and comics was applied to TV drama in modern form beyond martial art movies, historical TV series and games by exploring Japanese TV drama . This study showed that follows the Moo-hyup prototype such as imaginary space and violence, the relationship between characters with the spirit of Moo-hyup, and the structure of Moo-hyup story rather than a story of teenagers' growing-up. This study is ultimately expected to reveal the possibility that the Moohyup prototype can be applied to the TV drama in modern form as well as historical stories.

• Journal of the Korean Ceramic Society
• /
• v.11 no.2
• /
• pp.38-49
• /
• 1974

운모기판에 증착한 비정형 셀레니움 박막의 결정성장의 형태와 그 변태속도에 대하여 연구하였다 열처리된 박막에서 비정질성분은 CS2에 용해되나 결정질은 아무 변화없이 남아 있으므로 쉽게 현미경을 이용하여 그 모양을 조사할 수 있다. 결정은 (30$^{\circ}$~10$0^{\circ}C$ 온도 범위에서) 박막과 운모기관의 경계면을 따라서 원형상(구상 결정의 이차원 적 모양) 중심으로 부터 일정 속도로 자란다. 또한 필라멘트 형태의 결정이 원형상 결정의 비 규칙적인 부분에서 박막을 뚫고 위로 자란다. 이들 필라멘트형 결정은 자유표면에 도달하여 새로이 자유표면을 따라서 원형상으로 자라게 된다. 경계에 있는 원형상 결정의 두께는 약 500$\AA$정도이고 이것이 비정질 세레니움 박막에서 보이는 "어두어 지는" 현상의 원인이 되고 있음이 밝혀졌다. 원형상 결정은 아주 조그마한 결정 "도메인"으로 구성되어 있으며 이들 "도메인"의 축 방향은 경계면과 나란하고 반경방향에 수직으로 되어 있다. 고온처리에서 얻어지는 규칙적인 결정은 이들 "도메인"이 모여서 "라멜라"를 형성하여 중심부에서부터 뻗어나가고 이들 "라멜라"간의 공간은 불규칙적으로 나열된 "도메인"으로 연결되어 있으며, 고분자 결정에 비하여 훨씬 두껍다. 반경 방향으로의 결정성장 속도는 아주 순도가 높은 박막에서는 시간에 따라 일정하고 주어진 온도에서 재현성이 아주 좋다. 이 실험에서 측정된 성장속도는 지금까지 발표된 어느 실험에서 관측된 것보다 빠르고 또 자유표면에서 자라는 속도에 비해서 약 백 여배나 빠르다. 결장 성장의 온도 의존은 u=6$\times$1015 exp[-32.7(kcal/mol)/RT] cm/sec로 표시할 수 있다.

• Journal of the Korean Chemical Society
• /
• v.58 no.6
• /
• pp.528-534
• /
• 2014

In some binary solution, closed miscibility loop of temperature-composition phase diagram occurs where both an upper critical solution temperature and a lower critical solution temperature exist. It is known that this phenomena occurs if specific interaction between molecules exists. There are several ways describing the specific interaction. In this work it is assumed that the total number of specific interactions is distributed according to binomial distribution. In this case, exact mathematical conditions for closed miscibility loop phase behavior are derived when the specific interaction is applied to regular solution theory, quasichemical theory and Flory-Huggins lattice theory. And we investigated the effect of parameters on the phase diagram. The phase diagram of water-nicotine is calculated and compared with experimental data.

• Journal of the Korean Geotechnical Society
• /
• v.35 no.12
• /
• pp.123-134
• /
• 2019

This study presents dynamic responses of circular pipe models as a part of fundamental studies on dynamic stability monitoring of the large circular steel pipe cofferdam with the ship collision. Small-scaled laboratory experiments are performed with a single and bolted circular steel pipes with a diameter, thickness, and height of 30, 0.4, 90 cm, respectively. The bolted circular steel pipe is configured with three segments of 30 cm in height. Circular steel pipe models are embedded in a soil tank, all 1 m in length, width, and height. The thickness of soil in the soil tank is set at 23 cm. The ship collision is simulated with a hammer impacting. The dynamic responses are investigated with different water levels of 25, 40, 55, and 70 cm. Experimental results show that a signal energy decreases with increasing water level. More sensitive reduction in the energy appears for the bolted circular steel pipe. A predominant frequency decreases with increasing water level for both single and bolted steel pipes. The minor reduction in the frequency appears for the bolted circular steel pipe under the water level of 70 cm. This study suggests that the signal energy and frequency response is useful for the dynamic stability monitoring of the large circular steel pipe cofferdam.

• Proceedings of the Korea Contents Association Conference
• /
• 2015.05a
• /
• pp.429-430
• /
• 2015

본 연구는 한국의 신화 가운데 공간의 분리와 장소적 특성을 보이는 무속신화에 대해 분석하고 이를 통해서 무속신화의 원형을 토대로 한 스토리텔링의 다양한 가능성을 열어 보임으로써 문화산업시대와 한류라는 특성을 살릴 수 있는 계기를 마련하고자 한다.

• Proceedings of the Korea Contents Association Conference
• /
• 2003.11a
• /
• pp.338-342
• /
• 2003

The concept of a circularity function is used in defining fuzzy spheres The circularity function of a fuzzy sphere converses to one of crisp sphere as the fuzzy sphere shapes itself more and more like a crisp sphere.