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정지용의 ‘民謠風詩篇’과 초기시의 다양한 형식에 나타나는 비근대적 사유의 양상
정용호(Jeong, Yong-Ho) 한국어문학회 2015 語文學 Vol.0 No.127
Considerable numbers of traditional elements can be found in Jeong Ji-Yong’s early poetry. One of the most significant implications in Jeong Ji-Yong’s early poetry is its folk style, which has been discussed in quite a few times. Surprisingly, discussions on Folk Style Poem Collection, of its term ‘Folk Style’ has been denominated by Jeong Ji-Yong himself, however, would not seem to be placed quite actively. In addition, it has been concluded that previous discussions on Jeong Ji-Yong’s poetry was only focused on his borrowing of folk style, which resulted in lack of detailed discussion on emotional contexts of folk style, Thus, this paper will review the format of Jeong Ji-Yong’s Folk Style Poem Collection and his mental orientation based on its format. Presumably, the main format of Jeong Ji-Yong’s Folk Style Poem Collection is closely connected with the principle of folk style’s extended edition. The insertion, which takes place in folk song’s oral transmission site, can be processed by adding performer’s own lyrics into its original lyrics and making it extended edition. In this process, individual songs can be affected as a whole component with overall organic characteristics. The process of putting four pieces of poetry into one collection under the same category of Folk Style Poem Collection has a similar aspect of folk song’s style of extended edition. This feature shows in the formal characteristics of symbols, functioning as a ring phrase and nonformal word spacing. Jeong Ji-Yong also made it clear of the value of his words (languages) in his thought. This rather has dynamic and fluid forms, which is totally different from the words that produce stereotype and fixed structure and value, The image of the words, which Jeong ji-Yong pursued had constantly shown in his works from Folk Style Poem Collection to Nostalgia. Words in his work pieces represent dynamics and openness, which embraces various things.
부력 효과의 최소화를 통한 소화 근처 대향류 확산화염 거동에 관한 실험적 연구
정용호(Yong Ho Chung),박정(Jeong Park),권오붕(Oh Boong Kwon),윤진한(Jin-Han Yun),길상인(Sang-In Keel),김태형(Tae Hyung Kim),김영주(Young Ju Kim) 한국연소학회 2012 KOSCOSYMPOSIUM논문집 Vol.- No.45
Experimental study was conducted to elucidate flame extinction phenomena in counterflow flame. Using a curtain helium flow significantly reduced buoyancy such that the flame can be positioned at the center between the upper and lower nozzles even at the velocity ratio of 1.0. The curves of critical diluent mole fraction versus global strain rate have C-shapes. The flame oscillation was observed prior to low strain rate flame extinction at both flame conditions with and without minimizing buoyancy force. The results show that, at low strain rate flame, the self-excitation frequency with the order of 1.0 Hz in the case of utilizing pure helium gradually decreases in increase of N2 mole fraction in the curtain flow, meaning that buoyancy suppresses the self-excitation of the outer edge flame.
정용호(Yong Ho Chung),박대근(Dae Geun Park),박정(Jeong Park),윤진한(Jin Han Yun),권오붕(Oh Boong Kwon),길상인(Sang In Keel) 대한기계학회 2012 大韓機械學會論文集B Vol.36 No.2
대향류확산화염의 화염소화에 있어서 에지화염 역할에 관한 실험적 연구가 진행되었다. 속도비, 버너직경, 그리고 버너간격을 변화시키며 수행된 실험에서 전체신장률에 따른 화염소화 임계질소몰분율의 그래프는 c-커브 형태로 나타났다. 고신장률화염에서는 화염소화 임계질소몰분율의 그래프가 하나의 곡선으로 일치하였으며, 화염이 일차원의 응답특성을 갖는 것을 확인하였다. 화염 소화는 바깥 에지화염이 반경방향으로의 진동 후에 화염 중심으로 수축하며 소화하는 영역, 진동 없이 화염중심으로 수축하며 소화하는 영역, 그리고 바깥 에지부분의 수축과 진동 없이 화염중심에 화염 구멍이 생기며 소화하는 영역으로 세 가지 모드로 나타났다. 화염 표면온도 측정과 에너지 방정식의 각항을 수치해석 한 결과를 토대로 에지화염부분에서의 반경방향 전도 열손실이 에지화염의 불안정을 야기한다는 것과 전도를 통한 열 공급뿐만 아니라 대류를 통한 열 공급도 바깥 에지화염의 안정화에 기여한다는 것을 보였다. 그리고 반경방향의 전도열손실이 수축하며 소화하는 메커니즘의 지배적인 역할을 함을 보였다. The present study on nitrogen-diluted non-premixed counterflow flames with finite burner diameters experimentally investigates the important role of the outer edge flame in flame extinction. Flame stability diagrams mapping the flame extinction response of nitrogen-diluted non-premixed counterflow flames to varying global strain rates in terms of the burner diameter, burner gap, and velocity ratio are explored. There exists a critical nitrogen mole fraction beyond which the flame cannot be sustained, and also the curves of the critical nitrogen mole fraction versus the global strain rate have C-shapes in terms of burner diameter, burner gap, and velocity ratio. In flames with sufficiently high strain rates, the curves of the critical nitrogen mole fractions versus global strain rate collapse into one curve, and the flames can have the 1-D flame response of typical diffusion flames. Three flame extinction modes are identified: flame extinctions through the shrinkage of the outer edge flame with and without an oscillation of the outer edge flame prior to the extinction and flame extinction through a flame hole at the flame center. The measured flame surface temperature and a numerical evaluation of the fractional contribution of each term in the energy equation show that the radial conductive heat loss at the flame edge destabilizes the outer edge flame, and the conductive and convection heat addition to the outer edge from the trailing diffusion flame stabilizes the outer edge flame. The radial conductive heat loss at the flame edge is the dominant extinction mechanism acting through the shrinkage of the outer edge flame.
부력의 영향을 최소화한 조건에서 대향류 확산화염의 화염 소화에 관한 실험적 연구
정용호(Yong Ho Chung),박진욱(Jin Wook Park),박정(Jeong Park),권오붕(Oh Boong Kwon),윤진한(Jin-Han Yun),길상인(Sang-In Keel) 한국연소학회 2014 한국연소학회지 Vol.19 No.2
Experiments were conducted to clarify role of the outermost edge flame on low-strain-rate flame extinction in buoyancy-suppressed non-premixed methane flames diluted with He and N2. The use of He curtain flow produced a microgravity level of 10-2-10-3g in N2- and He-diluted non-premixed counterflow flame experiments. The critical He and N2 mole fractions at extinction with a global strain rate were examined at various burner diameters (10, 20, and 25 mm). The results showed that the extinction curves differed appreciably with burner diameter. Before the turning point along the extinction curve, low-strain-rate flames were extinguished via shrinkage of the outermost edge flame with and without self-excitation. High-strain-rate flames were extinguished via a flame hole while the outermost edge flame was stationary. These characteristics could be identified by the behavior of the outermost edge flame. The results also showed that the outermost edge flame was not influenced by radiative heat loss but by convective heat addition and conductive heat losses to the ambient He curtain flow. The numerical results were discussed in detail. The self-excitation before the extinction of a low-strain-rate flame was well described by a dependency of the Strouhal number on global strain rate and normalized nozzle exit velocity.
부력 효과의 최소화를 통한 대향류 확산화염 소화거동에 관한 실험적 연구
정용호(Yong Ho Chung),박정(Jeong Park),권오붕(Oh Boong Kwon),윤진한(Jin-Han Yun),길상인(Sang-In Keel),김영주(Young Ju Kim) 한국연소학회 2012 한국연소학회지 Vol.17 No.4
Experimental study was conducted to elucidate flame extinction phenomena in counterflow flame. Using a curtain helium flow significantly reduced buoyancy such that the flame can be positioned at the center between the upper and lower nozzles even at the velocity ratio of 1.0. The curves of critical diluent mole fraction versus global strain rate have C-shapes. The flame oscillation was observed prior to low strain rate flame extinction at both flame conditions with and without minimizing buoyancy force. The results show that, at low strain rate flame, the self-excitation frequency with the order of 1.0 Hz in the case of utilizing pure helium gradually decreases in increase of N₂ mole fraction in the curtain flow, meaning that buoyancy suppresses the self-excitation of the outer edge flame.
대향류확산화염의 화염소화에 있어서 에지화염 역할에 관한 연구
정용호(Yong-Ho Chung),박대근(Dae-Geun Park),박정(Jeong Park),배대석,윤진한(Jin-Han Yun),길상인(Sang-In Keel),서상일 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.42
The present study in nitrogen-diluted non-premixed counterflow flames with finite burner diameter experimentally investigates the important role of outer edge flame in flame extinction. Flame stability diagrams mapping the flame extinction response of nitrogen-diluted non-premixed counterflow flame to varying global strain rate in terms of burner diameter, burner gap, and velocity ratio are explored. Three flame extinction modes are identified: flame extinctions through the shrinkage of outer edge flame with as well as without having an oscillation of the outer edge flame prior to the extinction and flame extinction through a flame hole at the flame center. Measured flame surface temperature and numerical evaluation of the fractional contribution of each term in energy equation show that the radial conductive heat loss at flame edge destabilize the outer edge flame and the conductive heat addition as well as the convective heat addition to the outer edge from trailing diffusion flame to outer edge stabilizes the outer edge flame. The radial conductive heat loss at flame edge is the dominant extinction mechanism through the shrinkage of the outer edge flame. It is also shown that the reduction of flame length extends the flame extinction mode through the shrinkage of the outer edge flame to higher strain rate flame conditions.