• Title/Summary/Keyword: Boudary

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

  • Cho, Jeong-Sik;Cho, Jin-Dong
    • Journal of architectural history
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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
    • Proceedings of the Korean Institute of Communication Sciences Conference
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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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Stress analysis of creep material containing elliptical rigid inclusion by complex pseudo-stress function (복소 유사응력함수에 의한 타원 강체함유물을 내포하는 크립재료의 응력해석)

  • Lee, Kang-Yong;Kim, Jong-Sung
    • Transactions of the Korean Society of Mechanical Engineers A
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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.

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

  • Yoo, Nam-Jae;Lee, Myeung-Woog
    • Journal of Industrial Technology
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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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The Effect of Finished Surface Orientation on Friction Characteristics in Boudary Lubrication (경계윤활에서의 가공방향에 대한 마찰특성의 연구)

  • 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.

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

  • Shin, Ku-Kyun;Hong, Chin-Suk;Jeon, Jae-Jin;Kim, Sang-Yoon
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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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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A Study on the Athleisure of Characteristics in Modern Fashion (현대 패션에 나타난 애슬레저의 특성 연구)

  • Kwon, Jungsook
    • Journal of the Korea Fashion and Costume Design Association
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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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High temperature rupture lifetime of 304 stainless steel under multiaxial stress states (다축응력상태에서의 304 스테인리스강의 고온 파괴수명에 관한 연구)

  • Kim, Ho-Kyung;Chung, Kang;Chung, Chin-Sung
    • Transactions of the Korean Society of Mechanical Engineers A
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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
    • Proceedings of the Korean Society of Precision Engineering Conference
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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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Numerical Analysis on the Low Momentum Fluid Flow Characteristics in Centrifugal Pump Impeller (원심 펌프 회전차 내부의 저 운동량 유동특성에 관한 수치적 연구)

  • 김세진;김동원;김윤제
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
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    • pp.151-157
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    • 1999
  • In this study, tile characteristics of three dimensional flow fields in centrifugal flump impeller are investigated by numerically. Detailed analysis and understanding of flow field in centrifugal pump are very important to predict performance of components. The three dimensional viscous fluid flow in centrifugal pump is distingushed isentropic process region from irreversible process region by wall shear effect, secondary flow, centrifugal and Coriolis forces, variation of boudary layers. Development of low momentum region by viscous fluid flow in the centrifugal impeller causes stall and blockage which is irreversible process region, and resulting in decrease of the performance and efficiency of centrifugal pump. Especially, the result is that Coriolis and centrifugal forces are most powerful factors which are increasing the irreversible region.

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