• 제목/요약/키워드: Boudary

검색결과 16건 처리시간 0.158초

창덕궁 후원부의 공간경계요소(담장)에 관한 연구 (A Study for Walls as Space boudary elements of Changdeok-gung Garden)

  • 조정식;조진동
    • 건축역사연구
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    • v.24 no.1
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    • pp.41-50
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    • 2015
  • This study aims to investigate the physical characteristics and architectural ornaments of the walls (DamJang) and their bordering area that defines the Rear Garden of Changdeok-gung, one of the Royal Palaces in Seoul. This area, centered on Buyong-ji(부용지) and Aeryeon-ji(애련지), features the morphological diversity of buildings, walls, gates and stone bases in the palace. The findings are summarized as follows: First, DamJang, as a basic architectural element for the space organization, takes a set of various forms featuring different construction materials while responding positively to the physiographic nature of the surroundings; Second, DamJang along with their gates, also features different types of ornamental expressions which also suggest the hierarchy of its building and space; Third, typical of the traditional garden design in Korea are a group of DamJang standing as independent structures mostly around Buyong-ji and Aeryeon-ji whose finishing conditions also differ based on the nature of the space; Fourth, among commonly observed examples of DamJang in the Rear Garden and Changdeok-gung palace-wide, is a 'T' shaped wall whose heights and materials function as a design element for the garden.

삼중이온 주입기술에 의한 GaAs Varactor diode의 설계

  • 류시찬;조광래;이진구;윤현보
    • 한국통신학회:학술대회논문집
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    • pp.206-210
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    • 1986
  • Double Ion Implantation methods are used to improve the stiffness os carrier profiles, and then the analytical solutions to Poisson`s equation are derived with summation of each carrier profile. Numerical analyses are done using profer boudary conditions and the results show that the improvement of voltage-dependent-capacitance ratio (C(!)/C(25)) is obtained up to B.6. The third ion implantation is for the enhancement of the Schottky barrier height.

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복소 유사응력함수에 의한 타원 강체함유물을 내포하는 크립재료의 응력해석 (Stress analysis of creep material containing elliptical rigid inclusion by complex pseudo-stress function)

  • 이강용;김종성
    • 대한기계학회논문집A
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    • v.22 no.2
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    • pp.408-415
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    • 1998
  • The analysis model is the power law creep material containing an elliptical rigid inclusion subjected to the arbitrarily directional stress on infinite boudary. The stress analysis is performed using the conformal mapping function and complex pseudo-stress function. The stress distributions near an elliptical rigid inclusion are obtained with various ellipse shapes, strain hardening exponents and directions of applied stress.

역 T 형 옹벽에 작용하는 연직토압분포 (Vertical Earth Pressure Distribution on Cantilever Retaining Wall)

  • 유남재;이명욱
    • 산업기술연구
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    • v.16
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    • pp.181-189
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    • 1996
  • Centrifuge model tests of cantilever retaining wall were performed to investigate the vertical stress distribution due to selfweight of backfill material. Model tests were carried out to find the effect of arching action on vertical stress distribution by changing the roughness of rigid boundary slope and the distance between retaining wall and boudary slope. A reduced scale model of cantilever retaining wall was made with concrete and Jumunjin Standary Sand with 80 % of relative density was used as foundation and backfill material. Centrifuge tests were performed by increasing g-level up to 40 g with measuring vertical stress induced by selfweight of backfill material. Test results on vertical stress distribution were analyzed and compared with results of Silo theory.

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경계윤활에서의 가공방향에 대한 마찰특성의 연구 (The Effect of Finished Surface Orientation on Friction Characteristics in Boudary Lubrication)

  • 유응대;김태완;구영필;조용주
    • Tribology and Lubricants
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    • v.18 no.3
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    • pp.211-218
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    • 2002
  • The effect of characteristic of surface roughness and roughness patterns on friction was studied experimentally in boundary lubrication with reciprocating tribometer. Roughness was changed from Ra=0.2($\mu\textrm{m}$)to Ra=1.2($\mu\textrm{m}$). Three roughness pattern-transverse, oblique, longitudinal- were tested for various load and velocity. The experimental results show that the scuffing resistance of surfaces with transversal roughness pattern is higher than that of surface with longitudinal and obliq pattern. under the conditions of the roughness values of Ra=0.2, 0.5,1.0 and 1.2. surfacer roughness (Ra) was decreased with the normal load increased before scuffing occurred. oblique pattern and longitudinal pattern with Ra=0.2 and Ra=1.0 was higher scuffing load under low sliding velocity, but with Ra=0.5 was higher scuffing load under high sliding velocity.

천이 경계층 유동의 벽면 변동 압력에 관한 실험적 연구 (Experimental Study of Wall Pressure Fluctuations in the Regions of Flow Transition)

  • 신구균;홍진숙;전재진;김상윤
    • 한국소음진동공학회:학술대회논문집
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    • pp.811-816
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    • 2000
  • It has been long suspected that the transition region may give rise to local pressure fluctuations and radiated sound that are different from those created by the fully-developed turbulent boundary layer at equivalent Reynolds number. Experimental investigation described in this paper concerns the characteristics of pressure fluctuations at the transition. Flush-mounted microphones and hot wires are used to measure the pressure fluctuations and local flow velocities within the boudary layer in the low noise wind tunnel. From this experimental we could observe the spatial and temporal development process of T-S wave using Wigner-Ville method and found the possibility of relation between the characteristic frequency of T-S wave and free stream velocity and the boundary layer thickness based on nondimensional pressure spectra scaled on outer variables.

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현대 패션에 나타난 애슬레저의 특성 연구 (A Study on the Athleisure of Characteristics in Modern Fashion)

  • 권정숙
    • 한국의상디자인학회지
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    • v.18 no.4
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    • pp.101-116
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    • 2016
  • "Athleisure" indicates a new fashion style which takes advantage of the merits of both sportswear and outdoor clothing. This fashion style produces clothing we can wear very conveniently regardless of time and place. This paper, first, surveyed the concept of athleisure and the socio-cultural background of its appearance in modern fashion, and then, analyzed the growing processes and tendencies of athleisure in various fields of fashion. The three typical characteristics of athleisure can be summarized as Non-boudary, Functionality, and Sensualirty. It is hoped that this study has provided some theoretical evidences for the athleisure which is expanding broadly but vaguely as megatrends.

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다축응력상태에서의 304 스테인리스강의 고온 파괴수명에 관한 연구 (High temperature rupture lifetime of 304 stainless steel under multiaxial stress states)

  • 김호경;정강;정진성
    • 대한기계학회논문집A
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    • v.22 no.3
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    • pp.595-602
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    • 1998
  • Specimens of 304 stainless steel were tested to failure at elevated temperatures under multiaxial stress states, uniaxial tension using smooth bar specimens, biaxial shearing using double shear bar specimens, and triaxial tension using notched bar specimens. Rupture times are compared for uniaxial, biaxial, and triaxial stress states with respect to the maximum principal stress, the von Mises effective stress, and the principal facet stress. The results indicate that the principal facet stress gives the best correlation for the material investigated, and this parameter can predict creep life data under multiaxial stress states with rupture data obtained with specimens under uniaxial stresses. The results also suggest that grain boundary cavitation, coupled with localized deformation processes such as grain boudary sliding, controls the lifetimes of the specimens.

접착형 박막 측온게이지식 열류센서의 개발에 관한 연구

  • 한응교;박두원;최규철;노병옥;이명호
    • 한국정밀공학회:학술대회논문집
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    • pp.80-86
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    • 1991
  • In this study an the development of the heat flux sensor with thermocouple, the heat-treated adhesive type film nickel gauge(Ni-Gauge) for measuring temperature was used. and this Ni-Gauge is not only comparable for platinum gauge(Pt-Gauge) in linearity, but also economically cheap. And from this viewpoint. numerical analysis is essential to investigate charateristics of sensor, since this analysis is capable of simulating precise boudary condition and practical conditions and so on. By the way. there are many types of heat flux sensor. of which adhesive type flux sensor is common, in the study this type of heat flux sensor was chogen. and analysis of the sensor is considered as a kind of open cavity figure. performed by SIMPLER algorithm. As a result. through temperature distributial of the sensor by numerical analysis in steady and unsteady state, the dracteristics of the acdhesive type heat flux sensor(lst heat flux sensor) acooodinge to heat flux, that is, outvoltage, sensitivity. and responsibilty could be evaluated. in addition, time of improved heat flux sensor(2nd heat flux sensor) could be predicted fran the reflectian of proper operating temperature(l50 $^{\circ}C$)of theNi-Gauge.

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원심 펌프 회전차 내부의 저 운동량 유동특성에 관한 수치적 연구 (Numerical Analysis on the Low Momentum Fluid Flow Characteristics in Centrifugal Pump Impeller)

  • 김세진;김동원;김윤제
    • 한국에너지공학회:학술대회논문집
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    • pp.151-157
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    • 1999
  • 원심 펌프내 3차원 유동 특성을 고찰하기 위하여 혼류형 원심펌프의 내부유동특성을 수치적 고찰하였다. 회전차 내의 유동현상에 대한 상세한 해석과 이해는 원심펌프의 주요 요소들에 대한 성능 예측에 있어 매우 중요하다. 회전차 내부의 유동은 3차원 점성효과가 지배적이기 때문에 펌프 성능에 중대한 영향을 준다. 회전차내의 3차원 점성유동은 주 영역인 등엔트로피 유동과 원심력과 Coriolis힘에 의한 경계층의 변화, 벽면의 전단응력, 2차 유동(secondary flow)등의 영향에 의한 비가역 영역으로 구분한다. 저 운동량 영역을 만드는 회진차 내부의 점성 유동은 정체영역(blockage)과 실속(stall)이라는 비가역 영역을 만들게 되는데, 결과적으로 펌프의 성능과 효율저하를 유발시킨다. 특히 Coriolis힘과 원심력은 비가역 영역을 증대시키는 가장 큰 힘이라는 사실을 알았다.

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