• 디자인학연구
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• 16호
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• pp.101-110
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• 1996

추사고택은 조선조 상류주택의 전형적인 사례로서 실내공간의 구성방법과 요소를 분석해 본 결과 다양한 요인을 배경으로 한 분화과정 속에서 다기능을 수용할 수 있는 융통성을 가진 전형화 된 공간의 특성을 지니게 되었다고 요약할 수 있다. 계단식의 입면을 구성하는 엄격한 계층성에 의한 장소 성을 표현되는 일례가 되며, 마루와 온돌의 높이는 신분상의 위계질서와 음양사상을 나타내고 있다. 입면을 구성하는 목가구식 구조의 노출천장과 창호는 4계절의 기후변화 속에서 에너지를 효율적으로 관리하기에 적합하며, 자연미와 전통적 조형미가 어우러져 한옥 고유 미를 창조하고 있다. 추사고택에서 천장 고와 입면을 구성하는 요소들의 치수를 조사해본 결과, 대청의 입면 적 척도는 각 부재의 치수와 함께 사용자의 인체치수와 관계가 있었다. 평면 구성상의 특징은 규격화이며, 이것은 칸의 개념으로 설명할 수 있다. 기둥 간격 차이는 성별, 인체 치수 차이로 추측할 수 있다. 또한 1칸을 기본 모듈로 하여 규칙적인 공간 단위를 병렬로 증식시켜 확장한 것은 주인의 일상생활이 하인의 도움을 받아 이루어졌기 때문에 동선을 그리 중요하게 여기지 않은 결과이다. 추사고택 안채는 폐쇄적인 ㅁ 자형, 사랑채는 개방적인 ㄱ 자형으로 구성되어있는데, 이는 조선조의 남녀 지위차등과 내외사상, 그리고 자연 환경 적 요인이 복합적으로 주거의 평면 구성에 영향을 미쳤음을 보여주는 것이다. 그러나 본 연구가 조선시대 상류 주택 중 한 사례에 한정되었으므로, 현존하는 많은 사례 조사가 지속적으로 이루어져 본 연구의 미비점이 보완되어 더욱 체계적인 연구가 되어야 할 것으로 사료된다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2005년도 춘계학술대회논문집
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• pp.383-386
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• 2005

Low frequency heavy-weight impact noise is the most irritating noise in Korean high-rise reinforced concrete apartment buildings. This low frequency noise is generated by foot traffic due to the fact that Koreans do not wear shoes at home. The transmission of the noise is facilitated by a load bearing wall structural system without beams and columns which is used in these buildings. In order to control low frequency heavy-weight impact noise, floating floors using isolation materials such as glass-wool mat and poly-urethane mat are used. However, it was difficult to control low frequency heavy-weight impact sound using isolation material. In this study, reinforcement of concrete slab using beams and plate was conducted. Using the FEM analysis, the effect of concrete slab reinforcement using FRP(fiber-glass reinforced plastic) on the bang machine impact vibration acceleration level and sound were conducted at the standard floor impact sound test building. The $3{\sim}4dB$ floor impact vibration acceleration level and impact sound pressure level were reduced and the natural frequency of slabs were changed.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 E
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• pp.1788-1790
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• 1998

The dielectric layers in AC plasma display panel(AC PDP) are essential to the discharge cell structure, because they protect metal electrodes from sputtering by positive ion bombarding in discharge plasma and form a sheath of wall charges which are essential to memory function of AC PDP. This layer should have high dielectric strength and also be transparent because the luminance of PDP is strongly correlated this layer. In this paper, we discussed the dielectric strength and transparency of the dielectric layer under various conditions. As a result, on the $15{\mu}m$ thickness, the minimum dielectric strength was $29V/{\mu}m$ and the transmittance coefficient was about 80% after $570^{\circ}C$ firing process. It can be proposed that the resonable dielectric thickness in AC PDP is $15{\mu}m$ because it has about 80V margin on the maximum applied voltage.

• Journal of Korean Neurosurgical Society
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• 제45권1호
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• pp.43-45
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• 2009

A 75-year-old female presented with subarachnoid hemorrhage. Angiography revealed a partial duplication (fenestration) in the proximal $A_1$ segment and a ruptured aneurysm at the distal end of $A_1$ fenestration. This congenital anomaly accompanying an aneurysm was associated with duplicated ipsilateral middle cerebral artery (MCA). Congenital defect of the arterial wall and hemodynamic factors at the fenestrated $A_1$ are considered to play a significant role in the development of this aneurysm. The present case is peculiar because not only the ruptured $A_1$ aneurysm was related with the anterior and middle cerebral artery duplication but also the location of $A_1$ fenestration and the origin of $A_1$ aneurysm in a fenestration are quite unusual.

• Nuclear Engineering and Technology
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• 제42권2호
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• pp.211-218
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• 2010

An analysis model on debris transport in the containment floor of pressurized water reactors is developed in which the flow field is calculated by Eulerian conservation equations of mass and momentum and the debris particles are traced by Lagrange equations of motion using the pre-determined flow field data. For the flow field calculation, two-dimensional Shallow Water Equations derived from Navier Stokes equations are solved using the Finite Volume Method, and the Harten-Lax-van Leer scheme is used for accuracy to capture the dry-to-wet interface. For the debris tracing, a simplified two-dimensional Lagrangian particle tracking model including drag force is developed. Advanced schemes to find the positions of particles over the containment floor and to determine the position of particles reflected from the solid wall are implemented. The present model is applied to calculate the transport fraction to the Hold-up Volume Tank in Advanced Power Reactors 1400. By the present model, the debris transport fraction is predicted, and the effect of particle density and particle size on transport is investigated.

• Nuclear Engineering and Technology
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• 제41권8호
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• pp.1045-1052
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• 2009

A calculation model is developed to predict the transient free surface flow on the containment floor following a loss-of-coolant accident (LOCA) of pressurized water reactors (PWR) for the use of debris transport evaluation. The model solves the two-dimensional Shallow Water Equation (SWE) using a finite volume method (FVM) with unstructured triangular meshes. The numerical scheme is based on a fully explicit predictor-corrector method to achieve a fast-running capability and numerical accuracy. The Harten-Lax-van Leer (HLL) scheme is used to reserve a shock-capturing capability in determining the convective flux term at the cell interface where the dry-to-wet changing proceeds. An experiment simulating a sudden break of a water reservoir with L-shape open channel is calculated for validation of the present model. It is shown that the present model agrees well with the experiment data, thus it can be justified for the free surface flow with accuracy. From the calculation of flow field over the simplified containment floor of APR1400, the important phenomena of free surface flow including propagations and interactions of waves generated by local water level distribution and reflection with a solid wall are found and the transient flow rates entering the Holdup Volume Tank (HVT) are obtained within a practical computational resource.

• ETRI Journal
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• 제34권1호
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• pp.17-23
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• 2012

This paper analyzes the feasibility of a new 3DTV broadcasting service scenario via Advanced Television Systems Committee Mobile/Handheld (ATSC-M/H). We suggest a dual-channel system in which a left-view image is encoded by MPEG-2 with HD quality and a small-sized right-view image is encoded by AVC. Also, the left view is transmitted through ATSC main channel and the right view is transmitted through ATSC-M/H channel. Although the transport stream formats of two channels are different from each other, we demonstrate that it is possible for the ATSC 2.0 decoder to synchronize the display of the left and right views when both encoders use a common wall clock and time stamp. We also propose a program specific information descriptor which guarantees full compatibility with the conventional 2D HDTV and emerging mobile TV services. Finally, we provide the results of subjective visual quality assessment of the proposed system in support of its 3DTV service quality.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2009년도 제33회 추계학술대회논문집
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• pp.603-607
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• 2009

액체로켓엔진 연소기의 내벽에 사용하기 위한 니켈/크롬 도금 공정 개발을 수행하였다. 열충격 시험을 통해 니켈 도금 조건을 선별하였고 니켈/크롬 도금이 수행된 축소형 연소기의 연소시험을 통해 도금 층의 내구성 검증을 수행하였다. 시험결과 도금 층의 균열 및 박리는 발견되지 않았고, 이 결과로부터 현재 사용중인 대기 플라즈마 용사된 세라믹 코팅의 대안으로 니켈/크롬 도금을 액체로켓엔진 연소기에 사용할 수 있으리라 사료된다.

• KIEAE Journal
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• 제15권4호
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• pp.69-76
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• 2015

Purpose: This study is to investigate the effects of facade insulation and window remodeling of an existing old middle school building on the reduction of energy consumption. Method: To analyze energy performance of building, using DesignBuilder v3.4, building energy simulation tool based EnergyPlus engine. Energy consumption and problem of target building was analyzed based on data and survey. Based on building energy simulations it analyzed the variation of energy demand for the building according to U-value of wall, glazing properties and external shading devices. Result: When insulation of building was reinforced, cooling and heating load was decreased. Glazing properties that minimize cooling and heating energy consumption were analyzed. In conclusion, it is important to choose SHGC and U-value of window fit in characteristic of target building. Setting external blind for cooling load decreases 5%.

• 한국식품영양학회지
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• 제22권1호
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• pp.97-102
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• 2009

본 연구에서는 독성이 적고, 활성이 높으면서 안정한 새로운 tyrosinase 저해제를 미생물을 대상으로 얻고자 tyrosinase 저해제를 강하게 분비하는 방선균 F-97을 토양으로부터 분리하였다. 이 균의 기균사는 회색의 나뭇가지형 (tree type)이며, 포자의 끝부분이 유선형으로 회전되어 있고, 포자 표면은 구형의 smooth형으로 분류되었다. 세포벽의 DAP 성분은 LL-DAP이었으며, 세포균체의 당 성분은 검출되지 않았다. 기타 배양학적 및 생리적 특성을 종합한 결과 streptomyces aburaviensis 또는 근연균으로 추정된다.