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- 저자 : 조진수(Cho, Jin Soo) (검색결과 188 건)
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엇회전식 축류홴의 공력 특성에 관한 전산 해석 및 실험
조진수,원유필,이문철,Cho, Jin-Soo,Won, Yu-Phil,Lee, Moon-Cheol 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.3
A study was done on the numerical and experimental analyses of the aerodynamic characteristics of a counter rotating axial fan. The numerical analysis uses the frequency domain panel method developed for the aerodynamic analysis of interacting rotating systems, which is based on the unsteady lifting surface panel method. Each stage of interaction involves the solution of an isolated rotor, the interaction being done through the Fourier transform of the induced velocity field. Numerical results showed good agreements with other experimental data for single and counter rotating propeller systems. And they were compared with the experimental results of the counter rotating axial fan studied in the present paper. The performance test was carried out based on the Korean Standard (KS B 6311). It was focused on the relative efficiency increase of a counter rotating system for a single rotating one, and effects of the axial distance between the front and rear rotors on overall fan performances were investigated. As a result, it was shown that the counter rotating axial fan has the efficiency 14% higher than the single rotating one at peak efficiency points.
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조진수,정승백,심태보,Cho, Jin-Soo,Jung, Seung-Back,Shim, Tae-Bo 한국음향학회 2007 韓國音響學會誌 Vol.26 No.7
수중에서 무선통신이 기존에는 초음파를 이용한 단거리통신에 국한되었으나 최근 고주파를 이용한 장거리 통신의 필요성이 증가되고 음성뿐만이 아니라 각종 데이터나 고화질 영상자료의 송수신 수요가 늘어나고 있다. 본 연구에서는 수중에서 디지털 변조방식의 차이에 따라 실제 수중통신에 미치는 영향에 대하여 연구하였다. 모의 환경 하에서 PSK기반의 변조방식(BPSK, QPSK, MSK, GMSK)에 대한 시뮬레이션을 통해 실험한 결과 GMSK만이 큰 차이를 보였다. 위 결과를 바탕으로 SNR을 35dB이하로 하고 부산 남방에 위치한 207-선(한국해양자료센타)의 15Km 구간을 모의하여 음성통신과 영상자료를 전송실험한 결과 음성통신시($10^{-2}$BER, 채널용량 1Kbps기준)는 약 8Km의 거리 차이를, 그리고 영상자료($3{\times}10^5$ 화소, 화소 당 정보량 4bit) 전송시는 BPSK, QPSK, MSK 는 60Kbps, GMSK는 45Kbps의 전송율을 확보하여 약 7초의 전송시간 차이가 생김을 확인하였다. In underwater wireless communication, needs for long distance communication using the high frequency are surpassing ones of short range communication by ultrasonic wave, and demands for transmitting and receiving various data such as voice or high resolution image data are increasing as well. In this work, we studied the effects on the real underwater communication depending on the difference of digital modulation methods. Simulation shows that only the performance of GMSK among many other PSK based modulation schemes(BPSK, QPSK, MSK, GMSK) is significant. Test condition simulates the oceanographic conditions along the 207-survey line, 15Km south of Busan and SNR is maintained 35dB or below. Simulated tests are composed of both transmitting image data($3{\times}10^5$ pixel, 4 bit per pixel) and voice communication($10^{-2}$BER, channel capacity of 1Kbps). Test results show that there are gain of about 7 seconds in transmission time in image transmission case, where channel capacity for BPSK, QPSK, and MSK and for GMSK were 65 Kbps and 45 Kbps, respectively and gain of about 8Km in distances in voice communication case.
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고성능 2단 축류송풍기의 공력설계를 위한 수치해석 및 실험에 관한 연구
조진수,한철희,조이상,Cho, Jinsoo,Han, Cheolhui,Cho, Leesang 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.8
A numerical method and experiments for the aerodynamic design of high performance two-stage axial flow fans was carried out. A vortex ring element method used for the aerodynamic analysis of the propellers was extended to the fan-duct system. Fan Performance and velocity profiles at the fan inlet and outlet are compared with experimental data for the validations of numerical method. Performance test was done based on KS B 6311(testing methods for turbo-fans and blowers). The velocity profile was obtained using a 5-hole pitot tube by the non-nulling method. The two stage axial flow fan configurations for the optimal operation conditions were set by using the experimental results for the single rotating axial flow fan and the single stage axial flow fan. The single rotating axial flow fan showed relatively low efficiency due to the swirl velocities behind rotor exit which produced pressure losses. In contrast, the single stage and the two-stage axial flow fans showed performance improvements due to the swirl velocity reduction by the stator. The peak efficiency of the two stage axial flow fan was improved by 21% and 6%, compared to the single rotating axial flow fan and the single stage axial flow fan, respectively.
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조진수,변태균,박왕식,전창근,Cho, Jin-Soo,Pyun, Tae-Kyoon,Park, Wang-Sik,Chun, Chang-Kun 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.7
A three dimensional linear frequency-domain lifting surface panel method was used for the aerodynamic analysis of axial flow type micro-fans. As proven by the duct modeling, the tip clearance of the micro-fans tested is large enough to ignore the calculated effect of the duct system. As the numerical results and experimental data agreed well in the operating point region, the method was applicable in the parametric studies to determine the design parameters of axial flow fans. Experiments on micro-fans were carried out based on KS B 6311. The newly designed micro-fan showed improvements in both static pressure rise and volumetric flow rate compared to the existing fans at a given operating condition. No detection of surging and the smooth characteristic curve proved the improvement in performance. To reduce the fan noise in the fan design, it was necessary to make use of the frequency spectrum analysis data. Measurement of sound pressure level for micro-fans was conducted based on KS B 6361 and KS A 0705. The peak - which occurs at blade passage frequency and its higher harmonics due to the fan noise - was not detected. This justifies the design methodology of the blade.
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조진수(Jinsoo Cho),배종우(Jongwoo Bae) 대한전자공학회 2008 電子工學會論文誌-SC (System and control) Vol.45 No.2
TV를 포함하는 최근의 디스플레이 시스템들은 디지털화 및 대형화 되는 추세이며, 이러한 시스템들의 화질은 현재의 디스플레이 시스템 시장에서 매우 중요한 상품 경쟁력의 하나로 인식되고 있다. 이에 디지털 디스플레이 시스템의 화질을 개선하기 위한 다양한 연구들이 진행되어 왔다. 선명도 개선 기술은 디지털 영상(혹은 동영상)의 화질개선을 위한 중요한 기술들 중 하나로서, 일반적으로 영상경계(edge)의 천이시간(transition time)을 줄여 주는 천이향상(transient improvement) 기술을 기반으로 하고 있다. 하지만, 이 기술은 흔히 천이가 향상된 영상경계 주변에 원치 않는 휘도(혹은 색차)의 변화를 가져올 수 있는 오버슈트(overshoot) 및 언더슈트(undershoot) 현상을 발생시킨다. 이에 본 논문에서는 천이향상 시 발생하는 오버슈트 및 언더슈트를 효과적으로 제거하여 시각적으로 보다 선명하고 깨끗한 디지털 영상(혹은 동영상)을 얻기 위한 새로운 방식의 비선 형 필터 기반의 적응적 슈트제거 방법(nonlinear filter-based adaptive shoot elimination method)을 제안한다. 제안한 방법은 두 가지 직교 방향(orthogonal directional)의 최소/최대 비선형 필터들과 적응적 슈트제거 방식을 적용하여 시각적으로 민감한 오버슈트 및 언더슈트를 효과적으로 제거한다. 실험을 통하여, 제안한 방법이 영상경계의 천이향상 정도는 그대로 유지하면서 영상의 왜곡을 초래하는 오버슈트 및 언더슈트를 거의 완벽하게 제거한다는 것을 보여 주었다. 제안한 방법이 적용될 수 있는 제품들로는 디지털 TV, 디지털 모니터, 디지털 카메라/캠코더, 휴대형 멀티미디어 플레이어(PMP) 등이 있다. The current display systems including TVs are going digital and large-sized, and high visual quality of those systems becomes a very important selling point in the current display system market. Thus, various researches have been carried out for enhancing the visual quality of digital display systems. One of the important digital image(or video) enhancement techniques is sharpness enhancement, and it is generally based on a transient improvement technique that reduces the edge transition time. However, this technique often generates overshoot and undershoot, which cause undesirable pixel-level changes around the transient improved edge. In this paper, we propose a new nonlinear filter-based adaptive shoot elimination method for effectively suppressing the overshoot and undershoot that occur in the transient improvement, so that we can obtain visually sharper and clearer digital images(or videos). The proposed method uses two orthogonal directional min/max nonlinear filters with an adaptive shoot elimination scheme in order to effectively suppress the visually sensitive overshoot and undershoot. Experimental results show that the proposed method suppresses the overshoot and undershoot almost perfectly while maintaining the effect of the transient improvement. The applications of the proposed method include digital TVs, digital monitors, digital cameras/camcoders, portable media players(PMP), etc.
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조진수(Cho, Jinsoo) 한양대학교 평화연구소 2017 문화와 정치 Vol.4 No.3
국가재건 시기에 북한은 소비에트식 모델로 빠르게 사회주의 국가를 건설하고자 했다. 이러한 사회주의의 근대적 기획은 교육 분야에서도 적용되어 사회주의 교육체계가 빠르게 정립되었다. 사회주의 교육의 목표는 사회주의 인간형의 창출이다. 이를 위해 다양한 교육시스템의 정비가 이루어졌는데 특히 사회주의 교육의 특징이라고 할 수 있는 체육교육의 강화가 북한교육에서도 이루어졌다. 본 연구는 1950년대 국가재건 시기에 북한이 새로운 사회주의 인간형을 창출하기 위해 학생의 몸을 규율하고 통제하기 위한 수단으로 학교체육에 개입한 이유와 이때 활용된 전략을 생명관리정치의 규율권력기제를 사용하여 분석하였다. From the beginning of modern society, the politics of disciplinary power has tried to control the human body as a crucial way to rule the society as a whole. This is the crucial meaning of biopolitics that seems to have worked in the social context of the liberal government. In its national reconstruction period (1953-1960), however, the North Korean government used the bio-politics in a radical way in order to construct a socialist state as quickly as possible based upon the Soviet system. After the Korean War, North Korea strengthened the educational policy of the physical exercise since schools were the most crucial places for controlling the bodies of people. The purpose of this article is to show that the disciplinary power of North Korea can be found in various forms of the educational method of physical exercises. The modern socialist regime of North Korea in 1950s attempted to create a new type of the socialist man by primarily controlling the students’ bodies.
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