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배진현(Jinhyun Bae),김태성(Taesung Kim),정석규(Seokgyu Jeong),정찬영(Chanyeong Jeong),최정열(Jeong Yeol Choi),윤영빈(Youngbin Yoon) 한국추진공학회 2017 한국추진공학회 학술대회논문집 Vol.2017 No.5
본 연구에서는 스피커를 사용하여 Jet와 Swirl 유동에 각각 가진을 가함으로써 기체-기체 동축형 제트-스월 인젝터의 Injector transfer function (ITF)을 측정하였다. Feed system의 길이를 변화시켜감에 따라 ITF를 측정한 결과 섭동이 가해진 유동이 흐르는 공간의 공진주파수에서 ITF의 peak가 발생하는 것을 확인할 수 있었다. Jet 유동을 변화시키면서 Jet 유동에 가진을 줄 때, ITF의 크기는 감소하다가 56 slpm 이후부터는 증가하는 것을 확인할 수 있었다. 즉, Jet와 Swirl 유동의 속도차가 클수록 ITF의 크기가 커지는 것을 확인할 수 있었다. Swirl 가진 시에는 Jet 유동이 증가함에 따라 ITF가 감소하는 것을 확인할 수 있었는데, 이는 후단에서 일정 유량 대비 가진 에너지가 감소하기 때문이며, 이러한 차이는 후단의 Hot wire anemometer가 인젝터 중심축에 위치하기 때문이다. In this study, the injector transfer function (ITF) of a gas-gas coaxial jet-swirl injector is measured by applying excitation to jet or swirl flow using a loudspeaker. As a result of measuring the ITF according to the variation of feed system length, the ITF peak occurs at the resonance frequency of the space where the perturbed flow passes. When applying the excitation to the jet flow, as the jet flow increases up to 56 slpm, the magnitude of ITF decreases, and ITF increases thereafter. Therefore the larger the velocity difference between the jet and the swirl flow, the larger the ITF. In the case of the swirl excitation, the ITF decreases as the jet flow increases because of the decrease of the energy with respect to the constant flow at the downstream. This difference is caused by the location of the hot wire anemometer on the downstream of the injector center axis.
Ovarian Cancer Prognostic Prediction Model Using RNA Sequencing Data
Jeong, Seokho,Mok, Lydia,Kim, Se Ik,Ahn, TaeJin,Song, Yong-Sang,Park, Taesung Korea Genome Organization 2018 Genomics & informatics Vol.16 No.4
Ovarian cancer is one of the leading causes of cancer-related deaths in gynecological malignancies. Over 70% of ovarian cancer cases are high-grade serous ovarian cancers and have high death rates due to their resistance to chemotherapy. Despite advances in surgical and pharmaceutical therapies, overall survival rates are not good, and making an accurate prediction of the prognosis is not easy because of the highly heterogeneous nature of ovarian cancer. To improve the patient's prognosis through proper treatment, we present a prognostic prediction model by integrating high-dimensional RNA sequencing data with their clinical data through the following steps: gene filtration, pre-screening, gene marker selection, integrated study of selected gene markers and prediction model building. These steps of the prognostic prediction model can be applied to other types of cancer besides ovarian cancer.
Jeong, Chanyeong,Bae, Jinhyun,Kim, Taesung,Yoon, Jisu,Joo, Seongpil,Yoon, Youngbin Elsevier 2017 Proceedings of the Combustion Institute Vol.36 No.2
<P><B>Abstract</B></P> <P>This study investigated the flashback phenomenon coupled with self-excited combustion instability in turbulent premixed bluff-body flames using the pressure fluctuation measurement, high-speed OH-PLIF, and PIV techniques. Previous studies investigating flashback in a bluff-body have found that the flame moves back and forth around the trailing edge of the bluff-body; however, the phenomenon in which the flame propagates beyond the bluff-body has not been sufficiently studied. Therefore, this study focused on understanding a strong flashback, which can damage the upper section of a combustor and which is vulnerable to heat due to flame propagation over the front of the bluff-body.</P> <P>The combustion instability frequency resulting from changes in the combustion length occurred within the range of the resonance frequency of the combustor, thereby confirming that thermal-acoustic combustion instability occurred in the combustor. When the strong flashback occurs, an instantaneous adverse pressure gradient is formed within a combustion instability cycle. Consequently, the generated reverse flow pushed the flame attached at the trailing edge of the bluff-body to the upstream from the bluff-body. The flame propagated rapidly along the side of the bluff-body by the influence of the boundary layer flow and the decreased quenching distance. This propagated flame became the ignition source at the front tip of the bluff-body and generated the flame surface that propagated in all directions; thus, it was found to be the primary cause of the increase in the flashback distance. The flame flashback distance also varied depending on the combustor length and the initial flow condition. An attempt was made to concentrate the measured data of flashback distance under various conditions into a single line, and turbulence intensity and combustion instability frequency were the dominant factors that impacted the flashback distance.</P>
김태성(Taesung Kim),정찬영(Chanyeong Jeong),윤지수(Jisu Yoon),안명근(Myung Geun Ahn),윤영빈(Youngbin Yoon) 한국가시화정보학회 2015 한국가시화정보학회 학술발표대회 논문집 Vol.2015 No.12
This study measures the flame surface by using LIF technique. In this study, the experiments are performed in various combustors. The premixed flame surface is measured at the ducted combustor with V-gutter flameholder. The partial premixed flame front is measured at the model gas turbine combustor. At last, the flame surface of the diffusion flame is measured at jet combustor with coaxial air. At premixed flame, the fluorescence signal is measured over the entire combustion area. In contrast, the signal of diffusion flame is only appeared at the flame surface.
외부 교란에 대한 Burke-Schumann 화염에서 형상과 열방출량을 통한 응답 특성 파악
김태성(Taesung Kim),안명근(Myunggeun Ahn),황정재(Jeongjae Hwang),정찬영(Chanyeong Jeong),권오채(Oh Chae Kwon),윤영빈(Youngbin Yoon) 한국연소학회 2017 한국연소학회지 Vol.22 No.1
This paper shows the dynamics of the Burke-Schumann flame. To show flame dynamics, this paper measures the flame surface and heat release rate. The flame shape is divided into three types with forcing frequencies. When the forcing frequency is lower than 120 ㎐, the upper region of flame is cut. The flame is stagnant with 220 to 280 ㎐ forcing frequencies. The rest conditions of forcing frequencies make the connected wave shape of flame. The heat release rate is expressed by the flame transfer function. The gain of the flame transfer function is similar with the oscillation magnitude of the flame area except for flame cutting conditions. The flame is cut because the fuel is not supplied to upper flame region.