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RISS 인기검색어
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- 저자 : 권영필(Young-Pil Kwon) (검색결과 61 건)
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권영필 ( Young Pil Kwon ) 중앙아시아학회 2015 中央아시아硏究 Vol.20 No.2
The purpose of this article is to explain how Central Asian studies, or the study of the Silk Road in its broad meaning, existed and developed in Korea long before “The Association for the Central Asian Studies of Korea (1993)” and “The Korean Association for Central Asian Studies (1996)” were founded. The development of Central Asian studies in Korea has three stages. The first is the stage of making connections (1900s-1945). Notable examples in this stage include a visit of the respected Swedish leader of Central Asian studies, Sven Hedin (1865-1952), to Korea and his lecture on the nineteenth of December in 1908 on the topic of the Silk Road for Koreans. This was the first such lecture in Korea. Another example is Kimm Chung-Se (金重世, 1882-1946) the first Korean scholar who studied in Germany, finished the doctoral course at Berlin University, and published an annotated translation of a Central Asian Buddhist script (a list of Buddhist rules [佛敎戒本: Pratimoksa]) in an international academic journal(Asia Major, vol.2, Leipzig 1925). The second is the germination stage (1946-1979): Korean scholars who studied at the University of Tokyo in Japan, including Koh Byong-ik (高柄翊, 1924-2004) who taught classes on the history of east and west cultural exchange at Seoul National and Yonsei Universities, and Jo Jwa-ho (1917-1991) who first used the concept of ‘The Silk Road,’ in his book. In addition, in 1976 a class of Central Asian Art was first opened in Korea at Hongik University which laid the foundation for the development of Central Asian studies. In 1977 an international symposium about the Silk Road was first held in Korea hosted by the National Academy of Sciences in which Higuchi Takayasu from Japan and Joachim Werner from Germany gave presentations. The third is the transition stage (1980-1993): scholars of Central Asian Studies abroad came back to Korea and made their contributions. In 1986 the Central Asia Room was opened at the National Museum of Korea exhibiting items from the Otani Collection, giving an opportunity to popularize the field. In 1991, Silk Road antiquities from the Hermitage Museum in Russia and the Berlin Museum in Germany were first exhibited at the National Museum of Korea as Korean Central Asian studies gradually internationalized. Moreover, in this stage there was a crucial international academic event, the International Silk Road Great Expedition: Xinjiang, Southern Russia, and Maritime Route hosted by Unesco(1990-1991). This gave a precious opportunity for Koreans to meet foreign scholars of Central Asian studies and to view antiquities. Also the participation of Korean experts of Central Asian Studies, including Kwon Young-pil and Kim Ho-dong, resulted in significant achievements and brought about the organization in 1993 of the Association for the Central Asian Studies of Korea as well as the founding of its later form, the Korean Association for Central Asian Studies in 1996.
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권영필,홍하표,Kwon, Young Pil,Hong, Ha Pyo 대한설비공학회 1988 설비저널 Vol.17 No.2
The thermoacoustic oscillation induced in an air column with variable cross section area is investigated theoretically and experimentally. The onset condition of the oscillation is derived by equating the acoustic power production to the power dissipation. The power production at the heater is predicted by using the efficiency factor obtained by heat transfer analysis for a single wire in a uniform cross flow and considering the interference between heater wires. The power dissipation is estimated by measuring the attenuating coefficient from the pressure decay curve. The theoretical prediction to the onset condition of the oscillation is confirmed experimentally. The effect of the variation of the column cross section area on the onset condition is presented.
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권영필,이계철,Kwon Young-Pil,Lee Kye-Cheul 대한설비공학회 1987 설비저널 Vol.16 No.2
The heat transfer characteristics from a solid sphere in a fluctuating air flow is simulated numerically in the range of the Reynolds numbers, $1\;{\leqslant}\;Re\;{\leqslant}\;40.$ Such a situation may be encountered in forced convection from a heated spherical particle in a sound field or oscillat-ing flow. The amplitude and phase delay in the heat transfer response to the flow oscillation are computed for a small amplitude flow. The instantaneous response of heat transfer is simulated for the large amplitude oscillation and compared with the quasi-steady response. The effect of the oscillation on the time - mean value in the local and overall heat transfer rate is discussed along with the change in the flow .field.
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Rijke 관에서 나선형 가열기에 의한 열음향 파워의 생성
권영필,Kwon, Young-Pil 한국음향학회 2010 韓國音響學會誌 Vol.29 No.8
Thermoacoustic power generation by a spiral heater in the Rijke tube was analyzed numerically. In the analysis, variables were normalized by the angular frequency of the sound and the thermal diffusivity of the air. The effect of the heater wire diameter d, the spacing between wires P-d, and the air-current velocity $U_0$, upon the power generation was obtained and discussed. When the spacing is broad enough, the normalized velocity is $U_0{\approx}0.8$ and the diameter is $d{\approx}4$ for the maximum power generation. With decrease of the spacing, however, the power generation increases more than 5 times and becomes maximum around $d{\approx}2$, $P-d{\approx}3$. And the velocity $U_0{\approx}0.8$ for the maximum power generation is almost independent of the wire spacing. Rijke관에 놓인 나선형 가열기에 의하여 생성되는 열음향 파워를 수치해로 구하였다. 음장의 각진동수와 공기의 열확산계수에 의하여 무차원화한 가열선의 지름 d, 간격 P-d 및 유속 $U_0$가 음향 파워 생성에 미치는 영향을 구하고 고찰하였다. 가열선 간격이 충분히 클 때 무차원 유속이 $U_0{\approx}0.8$, 무차원 지름이 d.4일 때 가장 큰 열음향파워가 생성된다. 그러나 가열선 사이의 간격이 가까워지면 음향 파워 생성이 크게 증가하며 $d{\approx}2$, $P-d{\approx}3$에서 최대로 되며, 간격이 충분히 먼 경우의 최대값의 5배 이상이 될 수 있다. 최대 음향파워를 생성하는 유속은 가열선 간격에 관계없이 $U_0{\approx}0.8$일 때이다.
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권영필,이근희,장욱,김욱,Kwon, Young-Pil,Lee, Geun-Hee,Jang, Wook,Kim, Wook 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.12
The impinging tones by high-speed plane jets are experimentally investigated to study the edgetone characteristics. Experiment used a slit nozzle and a wedge system to generate edgetones. The jet in the experiment is varied from low to high subsonic speed to obtain the effect of the speed on the frequency characteristics of impinging tones. The experimental data obtained previously fur edgetones and platetones by various nozzles are compared with the present edgetone data. And the condition of tone generation, the frequency ranges, the effective source point and the sound pressure level are compared and discussed. It is found that the jet speed has no diect influence on the impinging tone characteristics. Regardless of the jet speed, the effective source point is about a quarter wavelength downstream from the edge tip. With increase in jet speed, the influence of the nozzle configuration is decreased and the operating frequencies show good coincidences by normalized parameters based on the slit thickness.
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탄화규소 불투명화재와 세라믹섬유가 Fumed 실리카 단열재의 열전도도에 미치는 영향
권영필,권혁천,박성,이재춘,Kwon, Young-Pil,Kwon, Hyuk-Chon,Park, Sung,Lee, Jae-Chun 한국세라믹학회 2007 한국세라믹학회지 Vol.44 No.12
The thermal conductivities of nano-sized fumed silica-based insulation media were investigated by varying a mean particle size of the silicon carbide opacifiers and ceramic fiber content. Opacifying effect of ceramic fiber and silicon carbide powders was discussed in terms of their content and the mean particle size of them. As the fiber contents increased from 10 wt% to 30 wt% in a material, its thermal conductivity at temperatures of about $620^{\circ}C$ decreased from 0.171 $Wm^{-1}K^{-1}$ to 0.121 $Wm^{-1}K^{-1}$. Meanwhile, the thermal conductivity at temperatures of about $625^{\circ}C$ decreased from 0.128 $Wm^{-1}K^{-1}$ to 0.092 $Wm^{-l}K^{-1}$ as the mean SiC particle size decreased from $31{\mu}m$ to $10{\mu}m$.
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