• 한국양식학회지
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• 제16권1호
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• pp.37-43
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• 2003

The present study reports morphology and developmental pattern off siliquosa cultured in a laboratory condition. The zygote was spherical with a diameter of 85 ${\mu}{\textrm}{m}$. During development the polarized zygote divided horizontally and the lower daughter cell divided horizontally into 2 cells. The upper cell was divided repeatedly in horizontal and vertical directions to form a cylinder-like structure, which subsequently developed into secondary and tertiary dichotomous branches. Optimum temperature for zygote release and fertilization was 25C. Injury inflicted by slicing was cured by epidermal differentiation, and adventitious branches; the branches emerging from the pith cells, however, developed no rhizoid. Adventitious branch formation rate was over 88% in all plates supplemented with 0.5 mg/L IAA and peaked at 98% under 0.5 mg/L IAA plus 0.5-5.0 mg/L NAA treatment. NAA stimulated the differentiation of adventitious branches at a wide range of concentrations, while IAA, 2,4-D and kinetin exhibited dose-dependent stimulation.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1999년도 가을 학술발표회 논문집
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• pp.135-142
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• 1999

Plate girder bridges for tile Korean high-speed railway are optimally designed. Static and dynamic constraints are all considered. The design variables are the thicknesses and the lengths of the plates that are used to form I-shaped main girders with variable cross-sections. And the objective function is tile steel weight of a main girder. A C++ based design program is developed; this program interfaces with a FORTRAN based optimization program ADS. From the results of optimal design for various span lengths, it is observed that the deck vertical acceleration is one of the most important constraints in a special range of tile span length. Front a parametric study, sensitivity of the optimal design to static as well as dynamic constraints are presented.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2009년도 세계 도시지반공학 심포지엄
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• pp.1202-1205
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• 2009

Embankment preloading, in conjunction with prefabricated vertical (PV) drains, was used to accelerate consolidation of marine clays in Pusan New Harbour project. UP to eightteen settlement plates were installed at the ground reclamated site under the embankment fill to monitor the preload performance. This analysis is carried out by five settlement prediction methods including the Asaoka, Hyperbolic, Hoshino, and back-analysis method based on optimization. The field settlement data can be analysed by settlement prediction methods to predict the ultimate settlement and the degree of consolidation of the reclaimed land under charge fill. The authors compared with the analyzed results of the methods.

• 조명전기설비학회논문지
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• 제28권11호
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• pp.93-99
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• 2014

The method of moments is applied to numerically compute the electrostatic capacitance of a parallel-plate rectangular capacitor of finite area. Each plate is discretized into 900 patches per unit area to ensure a high accuracy of computation. To further enhance computational results, the impedance matrix elements are additionally evaluated in the case that the observation patch is located above or below the source patch in the vertical direction. To examine the fringing effect at the edges of the capacitor, the normalized capacitances are computed as a function of separation distance. After these results have been verified by Palmer's formula, this method is extended to the computation of capacitances between two different size plates.

• 대한기계학회논문집
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• 제1권1호
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• pp.17-25
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• 1977

관벽의 영향을 무시할 수 있는 요기내의 액체중을 상승하는 단일공기포의 상승속도, 형산, 경로를 명확히 하고 원주형관, 정방형관, 평행평판간의 액체중을 상승하는 단일기포의 상승속도에 미치는 관벽영향을 구하였다. 원주형관을 상승하는 공기포는 dimensionless plot로 실험치를 통 적으로 표현할 수가 있었으며 관벽영향을 받지않고 관중을 상승할 수 있는 공기포에 대한 최저의 관경을 결정할 수가 있었다.

• 상하수도학회지
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• 제25권1호
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• pp.31-39
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• 2011

In order to suggest the methodology for achieving anti-vortex device within multi pump intake well, CFD(Computational Fluid Dynamics) simulation were conducted for two alternative suggestions. Multi-intake sump model with anti-vortex device basins were designed and the characteristics of submerged vortex were investigated in the flow field by numerical simulation. From the results of simulations, to install the horizontal plate and vertical cross plates within basins were effective for preventing air-induction vortex.

• 대한설비공학회지:설비저널
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• 제11권4호
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• pp.1-5
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• 1982

In this paper, a study is made of the steady laminar free convection boundary-layer equations on a sphere with uniform surface heat flux. To solve the boundary-layer equations, well-known Pohlhausen's simiarity solution for vertical plates is adopted just the same for spherical bodies by introducing twonondimensional parametric functions, so called azimuth functions. To determine the values of the azimuth functions which are expressed in series at the two points (the upper stagnation point and the equator), trial and error method is required. It is concluded that the heat transfer results are in good agreement with obtained from perturbation method and Von Karman-Pohlhausen method within the steady laminar free convection region for Pr=0.70.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2021년도 봄 학술논문 발표대회
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• pp.38-39
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• 2021

The use of temporary container classrooms has increased in recent years due to the development of the construction industry and renovation or rehabilitation of schools. Therefore, various problems, such as errors during assembling, design and insulation issues, and noise problems, have surfaced during the construction of temporary container classrooms. This study analyzes the causes of assembly errors during the manufacturing and installation processes to improve the quality of temporary container classrooms. Assembly errors are caused by non-level planes and inaccurate cutting during the manufacturing process. In the installation process, poor leveling is a major factor that causes errors during the assembly of temporary container classrooms. These causes result in uneven horizontal or vertical planes and uneven height. To solve these problems, quality improvement measures, such as pin connection, jig, joint coupling, and surface plates are proposed in this study.

• 비파괴검사학회지
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• 제36권4호
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• pp.295-299
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• 2016

증기발생기 2차측(관판 상단 및 관 지지판)에 잔류하는 이물질은 전열관에 마모를 야기하여 누설을 발생시킬 가능성이 있으며, 마모는 전열관 재료의 부식 특성과는 별개로 이물질의 재료, 형태, 크기 등에 따라 큰 영향을 받는다. 관판 상단 및 관 지지판 부위의 이물질 여부는 원격육안검사(FOSAR) 방법과 와전류탐상검사(ECT)를 통해 확인하고 있다. 증기발생기 2차측의 잔류 이물질은 그 재질이나 전열관과의 접촉상태 등에 따라 검출하는데 제한성이 나타난다. 따라서, 본 연구에서는 다양한 형태와 재료의 이물질을 관판 상단에서 수직 및 수평한 방향으로 이동시켰을 때, 이물질에 대한 보빈신호의 검출 감도를 측정하기 위해 데이터를 수집하고 분석하였다.

• Journal of Advanced Marine Engineering and Technology
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• 제41권1호
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• pp.1-7
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• 2017

두 판을 맞대기 용접할 경우 용접부 시종단부 측면에 열전도도가 큰 금속(예를 들어 구리)으로 만든 엔드 탭을 장착하고 용접을 진행하면 용접부 끝부분의 비드흘러내림과 결함을 방지할 수 있다. 본 논문에서는 엔드 탭의 방열 성능을 강화시키기 위하여 자연 대류에 의한 방열 특성이 뛰어난 것으로 알려진 평판 휜 모양을 적용하였고, 실험 및 수치해석을 통하여 엔드 탭에 평판 휜 모양의 구멍이 있는 형상이 구멍이 없는 형상보다 방열 성능이 더 뛰어남을 확인하였다. 그리고 열, 유동해석을 통하여 엔드 탭의 휜 형상에 대한 냉각 속도를 평가하여, 방열 성능 측면으로 도움이 될 형상 인자적인 특성을 파악하였다. 그 결과, 엔드 탭에 수직 휜이 있으며 휜 간 간격에 최적 휜 간 간격 식을 적용한 구조가 우수한 형상으로 판단되었다.