• 한국조경학회지
• /
• 제21권4호
• /
• pp.101-111
• /
• 1994

This study deals with the degree of enclosure on the Court Space in 'Suh-Won' that has warious perceptual composition elements. 1. The size of Court Space in which we can read the complexion of others and easily understand every behavior of them is similar to that of the 'Madang' in the Korean traditional houses. 2. The angles of elevation are within the range of suitable enclosure as going from the center of the court Space to 'Kang-Dang' and the space -from the center of the Court Space to 'Kang-Dang'- is restricted and surrounded. It is also within the range of the least enclosure as going from the center of the Court Space to the 'Mun-Ru'. 3. The degrees of enclosure based on the horizontal angle are within the degree we can perceive the objects of structure easily. 4. The degree of enclosure based on the ratio D/H is increased as approaching from 'Mun-Ru' to 'Kang-Dang'. The distance as approaching from 'Mun-Ru' to 'Kang-Dang' is changed from social distance to personal distance. To conclude this the Court Space in 'Suh-Won' represents the hierarchical system with variety and the degree of enclosure and the size of space are within the range of human scale.

• Journal of Astronomy and Space Sciences
• /
• 제19권4호
• /
• pp.341-350
• /
• 2002

한국천문연구원 지구접근천체 연구실과 연세대학교 천문대 YSTAR 팀은 해외에 설치될 전천탐 사용 광시야 망원경을 위한 돔 엔클로져(dome enclosure)를 순수한 우리 기술로 제작하였다. 이 돔 엔클로져는 망원경의 빠른 구동특성을 최대한 활용하기 위해 완전 개방형의 구조를 지님과 동시에 다양한 기상 조건에 대응하도록 견고한 구조를 가지도록 설계되었다. 또한, 자동 관측 프로그램과 연동되어 무인 관측 시스템의 한 부분으로도 그 역할을 다하도록 전자 제어부도 함께 설계되었다. 개발된 돔 엔클로져는 현재 남아프리카공화국 천문대 써덜랜드 관측소에 설치되어 성공적으로 가동되고 있다.

• 한국산업융합학회 논문집
• /
• 제12권4호
• /
• pp.179-186
• /
• 2009

Electronic components in an enclosure have been investigated to prevent undesired thermal problems. The electronic devices, such as ECUs of automotive engines, are operated under the contaminated environments, so that they rely on the passive cooling without any fluid-driving methods. Therefore the radiation heat dissipation plays more important role than the conduction and convection heat transfer. Hence their combined heat dissipation phenomena have been simulated by a numerical model to reveal the effects of supplied heat flux, emissivity of material, geometry of enclosure, charging gas and pressure. The result showed that the radiation had a significant effect on the heat dissipation of module in an enclosure, and some space above the module should be reserved to prevent its thermal problem. In addition, the higher thermal conductivity and pressure of gas in an enclosure could be necessary to improve the thermal dissipation from the electronic devices.

• Journal of Advanced Marine Engineering and Technology
• /
• 제16권5호
• /
• pp.85-96
• /
• 1992

Engine enclosures are widely adopted to reduce the noise emission in various fields of application. The radiated noise, which is due to the vibration of enclosure's outer surface, is composed of two kinds of sound power with different path of propagation. One is the 'structure-borne sound power' which stems from the engine's vibratory force applied to the structure of enclosure through the mounting parts of engine etc., while the other is the 'air-borne sound power' which is originated by the sound power radiated from the engine surface to the inner space of enclosure that should excite the vibration of enclosure from inside. In order to get a most efficient engine enclosure is required a profound consideration upon the above structure-borne and air-borne noise, since the guiding principle of countermeasure for each noise is quite different. The controlling of input vibration and its isolation are major subject for the structure-borne sound power and the specifications of absorbing member and damping panels are the major interests for the air-borne sound power. Hence it seems very efficient to separate the total sound power into two categories with a great accuracy when one think of further reduction of engine noise from the exciting enclosure, however, its separating methods have not been made clear for many years. Then author proposes a new practical separation method of two propagation path's contribution to the total radiation sound power for the enclosure under the engine operating condition.

• International Journal of Naval Architecture and Ocean Engineering
• /
• 제6권4호
• /
• pp.894-903
• /
• 2014

Insertion loss prediction of large acoustical enclosures using Statistical Energy Analysis (SEA) method is presented. The SEA model consists of three elements: sound field inside the enclosure, vibration energy of the enclosure panel, and sound field outside the enclosure. It is assumed that the space surrounding the enclosure is sufficiently large so that there is no energy flow from the outside to the wall panel or to air cavity inside the enclosure. The comparison of the predicted insertion loss to the measured data for typical large acoustical enclosures shows good agreements. It is found that if the critical frequency of the wall panel falls above the frequency region of interest, insertion loss is dominated by the sound transmission loss of the wall panel and averaged sound absorption coefficient inside the enclosure. However, if the critical frequency of the wall panel falls into the frequency region of interest, acoustic power from the sound radiation by the wall panel must be added to the acoustic power from transmission through the panel.

• 천문학논총
• /
• 제22권4호
• /
• pp.211-217
• /
• 2007

We have been making dual dome enclosures which are useful to track artificial space objects at SSNT (Space Science and Technology Lab.) Kyung Hee University. We verified the safety of the dome enclosures using basic design and structure analyses before manufacturing them, and then performed an optimization analysis for economic and safe systems. The dome enclosure has a fully-open type structure to smoothly operate a telescope made in the style of altazimuth mount with very fast tracking. It is also designed to be safe against extreme weather conditions. The general structure of the observatory system consists of the dual dome enclosures at the top of a container. For the structural analyses, we consider the following two methods: (1) gravitational sustain analysis - how the structure supporting the dome withstand the weight of the dome, and (2) wind load analysis that considers the effect of the wind velocity at the region where the observatory is located. The result of overall deformation is found to be less than 0.551mm and the result of equivalent stress is found to be 20.293Mpa, indicating that the dual dome system is reasonably designed. This means structurally to be safe.

• 한국군사과학기술학회지
• /
• 제3권1호
• /
• pp.207-217
• /
• 2000

A fire fighting characteristic by a single evaporating droplet in the case of a fire of military enclosure space was studied experimentally. Transient cooling of solid surface by water droplet evaporation has been investigated through controlled experiments using a heated brass cylinder. Quantitative predictions of droplet evaporation time and in-depth transient temperature distribution in solid have been made. The particular interest was in the removal of thermal energy from the heated cylinder by evaporative cooling. A $10{\mu}1$ single droplet is deposited on a horizontal brass surface with initial temperatures in the range of $90^{\circ}C{\sim}130^{\circ}C.$ The results can be summarized as follows; Evaporating droplet was divided into three different configuration. Evaporation time was predicted as a function of initial surface temperature ($t_c=492.62-6.89T_{s0}+0.0248T_{s0}^2).$ The contact temperature was predicted as a function of initial surface temperature( $T_{i}$=0.94 $T_{s0}$+1.4), The parameter ${\beta}_o$ was predicted as a function of initial surface temperature( ${\beta}_0$ : 0.O0312 $T_{s0}+0.932$)>)>)

• 한국소음진동공학회논문집
• /
• 제22권8호
• /
• pp.756-762
• /
• 2012

A method of the low-frequency noise reduction in an enclosure by using an array of Helmholtz resonator is presented. An integral form of equation, which represents the acoustical coupling between the internal sound field and the resonator array, is formulated so that the boundary element method can be applied to solve the coupling problem. It is shown that the resonator array on the surface of the enclosure can be regarded as impedance patches on the boundary element. Experiments on a simple enclosure acoustically coupled with an array of resonators are conducted to verify the method. The predicted noise reduction by the boundary element method shows good agreement with the measured one. The effects of the resistance of resonators as well as the number of resonators on the noise reduction are demonstrated. As a practical example, the presented method is applied to the payload fairing of a space launcher with resonator arrays. It is demonstrated that the resistance of resonators affects significantly the required number of resonators to achieve a desired noise reduction.

• 대한지리학회지
• /
• 제50권4호
• /
• pp.431-449
• /
• 2015

신자유주의의 사상적 기원과 논의구도는 매우 이질적이며, 접근방법도 아나키즘, 탈신자유주의를 포함하여 매우 다양하다. 2008년 금융위기를 계기로 신자유주의는 그 정당성과 안정성을 상실하기는 했지만 여전히 광범위한 변이들을 창출하면서 진화하고 있기 때문에 신자유주의 분석에서 공간적 관점의 중요성이 커지고 있다. 특히 신자유주의의 시공간 전략과 시스템 재생산을 위한 생성적 거점으로서 도시 공간이 핵심 무대가 되었다. 자본의 형식적 실질적 공간포섭으로서 신자유주의 도시화의 구체적 전개과정에서 가장 중요한 수단이 도시 인클로저이다. 현대 자본주의는 도시 인클로저를 통해 시초축적기의 원리를 현대적으로 재구성하여 탈취 기반 축적을 지속하고 있다. 이러한 도시 인클로저는 공적소유라는 본래의 공익개념으로부터 경제적 공익개념으로의 해석 변경과 사적자본의 이익을 위한 공용수용을 통해서 이루어지고 있다. 도시 인클로저는 생산 및 생존수단으로부터 노동자의 분리 소외를 더욱 심화시키는 물상화, 자유로운 장소향유의 제지, 세습가산제 형태로의 도시경제 전환을 동반하면서 인클로저의 일상화를 촉진하고 있고, 사적이익으로 뒤얽힌 사회적 규범들이 공적공간과 공간의 공공성을 지배하도록 만든다.

• International Journal of Aeronautical and Space Sciences
• /
• 제3권1호
• /
• pp.95-104
• /
• 2002

Numerical solution of the full Navier-Stokes equation as well as the energy equation has been obtained for the unsteady natural convection in a rectangular enclosure. One side wall was maintained at very high temperature simulating fires. Especially the effect of surface radiation was taken into account. While the enclosed air was assumed to be transparent, the internal walls directly interacted one another through the surface radiation. Due to a significant temperature difference in the flow field, the equation of state was used instead of the Boussinesq approximation. It was found that the rapid heating of the adiabatic ceiling and floor by the incoming radiation from the hot wall made the evolution at thermo-fluid field highly unstable in the initial period. Therefore, the secondary cells brought about at the floor region greatly affected the heat transfer mechanism inside the enclosure. The heat transfer rate was augmented by the radiation, resulting in requiring less time for the flow to reach the steady state. At the steady state neglecting radiation two internal hydraulic jumps were clearly observed in upper/left as well as in lower/right comer. However, the hydraulic jump in the lower/right comer could not be observed for the case including radiation due to its high momentum flow over the bottom wall. Radiation resulted in a faster establishment of the steady state phenomena.