• 제목/요약/키워드: Slit wall

검색결과 87건 처리시간 0.026초

항만구조물 반사특성에 미치는 Slit 형상의 영향 (The Influence of Slit Shape on the Reflective Characteristic of Caissons in Harbor)

  • 김규한;김민수;이강철;류무은
    • 한국해양공학회:학술대회논문집
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    • 한국해양공학회 2006년 창립20주년기념 정기학술대회 및 국제워크샵
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    • pp.461-464
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    • 2006
  • The caisson of the inner wall type has a weak point that reflecting wave is big. Therefore it has been studied that the research of the decreasing reflecting wave using installation the perforated wall in front of caisson to decrease of that weak point. In this study, we analyzed the characteristic of reflection horizontal and diamond style vertical slit caisson using hydraulic model test. According to the results of experiments, we could confirm that diamond style vertical caisson has a reflection coefficient which has lower than horizontal caisson of the reflection coefficient of 5~10%.

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강재 슬릿과 회전 마찰형 감쇠 장치를 결합한 복합 감쇠 장치의 실험적 구조 성능 평가 (Experimental Evaluation for Structural Performance of Hybrid Damper Combining Steel Slit and Rotational Friction Damper)

  • 김유성;강주원;박병태;이준호
    • 한국공간구조학회논문집
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    • 제19권3호
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    • pp.101-109
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    • 2019
  • In order to develop the compatible damping device in various vibration source, a hybrid wall-type damper combining slit and friction damper in parallel was developed. Cyclic loading tests and two-story RC reinforced frame tests were performed for structural performance verification. As a result of the 5-cyclic loading test according to KBC-2016 and low displacement cyclic fatigue test, The hybrid wall type damper increased its strength and the ductility was the same as that of the slit damper. In addition, As a result of the two-layer frame test, the reinforced frame had about twice the strength of the unreinforced frame, and the story drift ratio was satisfied to Life Safety Level.

고전적 및 삼각조각 기법을 이용한 단-측면 미세동맥 접합술의 실험적 연구 (The Experimental Study of the End-to-side Microarterial Anastomosis with the Longitudinal Slit and the Triangular Flap)

  • 이준모;이강욱;이동근
    • Archives of Reconstructive Microsurgery
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    • 제1권1호
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    • pp.51-55
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    • 1992
  • Problems of composite tissue transfer commonly arise when a single indispensable recipient vessel receives the graft vssel, and the graft vessel must be sutured in end-to-side fashion so as not todisturb the vascularity of the recipient vessel. The triangular flap in the recipient vessel wall gives an intact endothelial surface when the flow of blood stream is presented and may reduce the chance of anastomosis. We selected mature Wistar rats weighing over 450 grams to compare the conventional longitudinal slit from the triangular flap in the recipient carotid artery over bloood pressure and blood flow when the donor carotid artery was anastomosed in end-to-side fashion. In 30 minutes after anastomosis, maximum blood pressure measured in the donor carotid arterial side when the recipient arterial wall was fasioned with the longitudinal slit was recorded 114 mmHg and with the triangular flap 100mmHg. Minimum blood pressure with the longitudinal slit was 98mmHg and with the triangular flap 88mmHg. The amount of blood collected for 30 seconds in the conventional longitudinal slit was 1.18mg and in the triangular flap 0.78mg. Histology study in 30 minutes, the conventional longitudinal slit demonstrated the more hemorrhagic features around the suture material compared to that of the triangular. flap and, in the 7th day, the conventional longitudinal slit demonstrated the more prominent granulomatous reactions and vascular proliferations around the suture material compared to that of the triangular flap.

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직립 슬릿판에 의한 반사율과 투과율 해석 (On an Analysis of Reflection and Transmission Coefficients by a Vertical Slit Plate)

  • 조일형;김남형
    • 한국해양공학회지
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    • 제16권3호
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    • pp.1-7
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    • 2002
  • In this paper, a numerical model to analyze the performance of a vertical slit-type wave absorber is developed under the assumption of inviscid water waves. The formulation combines the linear potential theory with a semi-empirical description of the eddy-shedding at a slit-type wave absorber. We investigated the reflection coefficients over a wide frequency range for a vertical slit-type wave absorber both with and without a solid rear wall. Model test was conducted at KRISO' s two dimensional wave tank to validate the theoretical results. It is found that the agreement between theoretical results and experimental data is surprisingly good. We found that the wave absorbing system using a vertical slit plate has sufficient potentials for breakwaters for ocean development.

전기 이중층의 상호작용을 고려한 2차원 슬릿 내의 전기삼투 유동에 관한 이론적 해석 (An Theoretical Analysis of Electro-osmotic Flow in 2-dimensional slit with Electrical Double Layers in Interaction)

  • 이대근
    • 유체기계공업학회:학술대회논문집
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    • 유체기계공업학회 2006년 제4회 한국유체공학학술대회 논문집
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    • pp.497-500
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    • 2006
  • An theoretical analysis on the electro-osmotic flow in a 2-dimensional slit, that is induced by an external electric field acting on the electrical double layers near the slit wall, was performed. Especially, although there were many studies on the interacting electrical double layers, it was found in this study that they have several physical or mathematical fallacies. To resolve these, the general solution on the charge-regulating slit with the height as a parameter was obtained. The results of this work can provide the electrokinetic solution of nanoscale slit with the electrical double layer interaction as well as that of microscale slit without the interaction and can be used as the benchmark of a numerical analysis and the reference of electrokinetic flow path design.

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Slit-Coater내의 Photo Resist의 코팅 특성 (Coating Characteristics of Photo Resist in a Slit-Coater)

  • 김장우;정진도;김성근
    • 반도체디스플레이기술학회지
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    • 제3권3호
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    • pp.41-44
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    • 2004
  • The aim of this study is the confirmation of the coating uniformity affected by the surface tension and wall attachment angle in a slit-coater model. In this work, we use the commercial code (Fluent) to solve the two-phase flow formed with air and photo resist numerically. The results show that the surface tension is the most important factor to determine the coating efficiency in the view of coating uniformity, and the coating uniformity is 2% for our slit-coater model and conditions. To improve the coating uniformity, it is in need of minimization of the sidewall effect of slit-coater.

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정수면 아래 최적 유공부 길이 산정 : 유공 1실 조건 (Estimation of Optimal Slit Length of Perforated Wall below Still Water Level: Single Chamber Condition)

  • 김영택;이종인
    • 한국수자원학회논문집
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    • 제46권4호
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    • pp.327-334
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    • 2013
  • 본 연구에서는 단면수리실험으로 다양한 실험파 조건과 유수실 폭(B)을 변화시키면서 유공부 길이(S)와 반사율의 관계를 검토하여 유공 1실인 유공구조물의 정수면 아래 최적 유공부 길이를 제시하였다. 입사파로 불규칙파를 적용함에 따라 최저 반사계수는 상대 유수실 폭($B/L_s$)이 $B/L_s{\approx}0.15$에서 발생하였다. 유공부 길이와 입사파고와의 관계를 고려한 상대 유공부 길이($S/H_s$)는 $S/H_s{\approx}2.5$에서 최저 반사계수를 보였으며, 이는 정수면 아래 유공부 길이가 입사파고의 약 2.5배일때 최적임을 의미하는 것이다.

레이저 슬릿빔의 경사각과 카메라 자세 추정 알고리즘을 이용한 벽면 결함 측정 (Measurement of Defects on the Wall by use of the Inclination Angle of Laser Slit Beam and Position Tracking Algorithm of Camera)

  • 김영환;송상호;윤지섭;강이석
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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    • pp.339-339
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    • 2000
  • In this parer, a method of measuring the size of defects on the wall and restructing the defect image of 3-dimension is developed based on the tracking algorithm of a camera position which uses the inclination angle of line slit beam for overcoming the difficulty of the corresponding problem identifying the image point in the both image. In the experiments, an algorithm for estimating the horizontal angle of CCD camera is presented and validated by applying it to the measurement of area and length under the variations of both the distance and the angle of CCD camera. And its performance is compared to that of the rotating and mapping method of image which has the Euclidian distance.

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조적채움벽 및 강재댐퍼 보강 RC 골조의 내진성능 평가에 관한 연구 (A Study on Seismic Performance Evaluation of RC Frame Retrofitted by Masonry Infill Wall and Steel Damper)

  • 이정한;양원직;강대언;송한범;오상훈;이원호
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2005년도 추계 학술발표회 제17권2호
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    • pp.129-132
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    • 2005
  • The primary purpose of this investigation is to find out the shear behavior and the shear capacity of RC bare frames, brick-infilled RC frames, and damper-retrofitted RC frames and to evaluate the average shear strength of brick--infill wall. The main variables art the absence of brick infill wall and steel plate slit damper. The test results show that the shear capacity of specimen IF-DR is 2.8 times as high as that of the specimen BF and it presents the fact that the retrofitting effect and the possibility of RC frame reuse with changing the slit damper is verified. And the average shear strength of the brick infill wall is figured to be at $5.0 kgf/cm^2$.

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Taylor-Couette 유동에서 축방향 홈과 반경방향 온도구배의 영향에 대한 실험적 연구 (Experimental Study of the Axial Slit Wall and Radial Temperature Gradient Effect on Taylor-Couette Flow)

  • 이상혁;김형범
    • 한국가시화정보학회지
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    • 제6권2호
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    • pp.33-38
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    • 2008
  • The effect of the radial temperature gradient and the presence of slits in the wall of outer of two cylinders involved in creating a Taylor-Couette flow was investigated by measuring the velocity field inside the gap. The slits were azimuthally located along the inner wall of the outer cylinder and the number of slits used in this study was 18. The radius ratio and aspect ratio of the models were 0.825 and 48, respectively. The heating film wrapped around the inner cylinder was used for generating the constant heat flux and we ensured the constant temperature condition at the outer space of the outer cylinder. The velocity fields were measured by using the PIV(particle image velocimetry) method. The refractive index matching method was applied to remove image distortion. The results were compared with plain wall configuration of Taylor-Couette flow. From the results, the presence of slits in the wall of outer cylinder and temperature gradient increased the flow instability.