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OTT 서비스에 대한 수용 태도 연구: 대학생 이용자의 인식을 중심으로
서상호 한국커뮤니케이션학회 2022 커뮤니케이션학연구 Vol.30 No.1
최근 OTT 서비스가 빠른 속도로 확산 하면서 기존의 미디어 소비 환경이 급격히 변화하고 있다. 시청자가 방송영상 콘텐츠를 전통적으로 이용하던 지상파와 유료방송 플랫폼 대신에 이제는 OTT 서비스를 통한 방송영상 콘텐츠의 소비가 젊은 층을 중심으로 보편화하고 있다. 이에 본 연구는 Q 방법론을 이용하여 OTT 서비스 이용자의 수용 태도를 파악하고 이를 바탕으로 국내 OTT 서비스 시장에서의 향후 사업전략 및 정책 방안에 대해 논의하고자 한다. 이를 위해 총 33개의 Q 표본과 21명의 P 표본을 분석하였고, 그 결과 4개의 유형이 발견되었다. 제1유형은 ‘영상 품질 우선형’, 제2유형은 ‘경제적 이점 중시형’, 제3유형은 ‘기존 매체 보완형’, 제4유형은 ‘규제 필요성 공감형’이었다. 분석 결과를 볼 때 국내 OTT 서비스 이용자의 특성을 반영한 사업전략과 정책 방안이 필요할 것으로 보인다.
서상호,유상신김영호노형운,Seo, Sang-Ho 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.11
Experimental and numerical studies for three-dimensional pulsatile flows are conducted to investigate the flow characteristics in the bifurcated tubes. Velocity measurements in experimental study were made by both Pulsed Doppler Ultrasound(PDU) machine and Laser Doppler Anemometer(LDA) system. Glycerin is used for experimental study. Experimental results are used to verify the results of the numerical simulation. Flow characteristics of Newtonian fluid and blood in the bifurcated tubes under the steady and pulsatlie flows are numerically investigated. Finite volume method is employed for three-dimensional numerical simulations. Blood is considered as a non-Newtonian fluid and the constitutive equation of blood is used for the numerical analysis. Numerical analyses are focused on the flow patterns for various branch angles ranging from 30.deg. to 90.deg. and diameter ratios such as 1.0, 0.8, and 0.6. Pulsatile flow characteristics of blood are compared with those of Newtonian fluid. Parameter effects on axial velocity, pressure and wall shear stress distribution along the bifurcated tubes are discussed in terms of the branch angle, diameter ratio, and Reynolds number.
종횡비 변화에 따른 사각주형 구조물주위의 풍압계수 결정
서상호,이광열,유상신,노형운,Suh, S.H.,Lee, K.Y.,Yoo, S.S.,Roh, H.W. 대한설비공학회 1995 설비공학 논문집 Vol.7 No.1
The purpose of this study is to determine the wind pressure coefficients around prismatic structures with different aspect ratios. Air flows around a model of prismatic shape are investigated experimentally in the wind tunnel and simulated using finite volume method. Pressure distributions and the corresponding pressure coefficients are calculated from the experimental and numerical results. The effects of aspect ratios on the pressure coefficients are discussed extensively. The numerical results are compared with those of experiments. The simulated and experimental results for average wind pressure coefficients are considerably lower than those defined in the Korean Architectural Standard Code.
입자영상유속계와 컴퓨터 시뮬레이션을 이용한 분기관내 유동해석
서상호,최을,노형운,도덕희,Sub, Sang-Ho,Choi, Yul,Roh, Hyung-Woon,Doh, Deog-Hee 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.1
The objective of the current study is to understand steady 3-dimensional flow phenomena in a bifurcated duct experimentally. A bifurcation model is fabricated with transparent acrylic resin to visualize the whole flow field with the PIV system. The gray level cross-correlation method is applied to the image processing algorithm. The subpixel and the area interpolation methods are used to obtain the final velocity vectors. The finite volume predictions are used to analyze the flow patterns in the bifurcation model. The results of the computer simulation and the PIV experiment for three-dimensional flow show the recirculation zone and the formation of the paired secondary flow distal to the apex of the bifurcation model. The results obtained with the two methods also show that the branch flow strongly strikes the inner wall due to the inertial effect and accompanied helical motion as it flows toward the outer wall.
서상호,유상신,장남일,Seo, Sang-Ho,Yu, Sang-Sin,Jang, Nam-Il 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.5
The pressure loss coefficient of Newtonian and non-Newtonian fluids such as water, aqueous solutions of Carbopol-934 and Separan AP-273 and blood in the stenotic tubes are determined experimentally and numerically. The numerical analyses for flows of non-Newtonian fluids in the stenotic tubes are conducted by the finite element method. The effect of the contraction ratio and the ratio of length to diameter on the pressure drop are investigated by the experiments and numerical analysis. The pressure loss coefficients are significantly dependent upon the Reynolds number in the laminar flow regime. As Reynolds number increases, the pressure loss coefficients of both Newtonian and non-Newtonian fluids decrease in the laminar flow regime. As the ratio of length to diameter increases the maximum pressure loss coefficient increases in the laminar flow regime for both Newtonian and non-Newtonian fluids. Newtonian fuid shows the highest values of pressure loss coefficient and blood the next, followed by Carbopol solution and Separan solution in order. Experimental results are used to verify the numerical analyses for flows of Newtonian and non-Newtonian fluids. Numerical results for the maximum pressure loss coefficient in the stenotic tubes are in fairly good agreement with the experimental results. The relative differences between the numerical and experimental results of the pressure loss coefficients in the laminar flow regime range from 0.5% to 14.8%.