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Bae, Hyowon,Lee, Ho-Jun,Lee, Hae June The Korean Vacuum Society 2016 Applied Science and Convergence Technology Vol.25 No.6
The discharge characteristics of pulse-driven coplanar micro barrier discharges for an ultraviolet (UV) light source using Ne-Xe mixture have been investigated using a two-dimensional fluid simulation at near-atmospheric pressure. The densities of electrons, the radiative excited states, the metastable excited states, and the power loss are investigated with the variations of gas pressure and the gap distance. With a fixed gap distance, the number of the radiative states $Xe^*(^3P_1)$ increases with the increasing driving voltage, but this number shows weak dependency on the gas when that pressure is over 400 Torr. However, the number of the radiative states increases with the increase of the gap distance at a fixed voltage, while the power loss decreases. Therefore, a long gap discharge has higher efficiency for UV generation than does a short gap discharge. A slight change in the electrode tilt angle enhances the number of radiative species 2 or 3 times with the same operation conditions. Therefore, the intensity and efficiency of the UV light source can be controlled independently by changing the gap distance and the electrode structure.
Hyowon Bae,Jung Yeol Lee,Hae June Lee 한국진공학회(ASCT) 2017 Applied Science and Convergence Technology Vol.26 No.4
The discharge characteristics of the radio frequency (RF) surface dielectric barrier discharge have been simulated for the investigation of the ratio of the ion transit time to the RF period. From one-dimensional particle-incell (PIC) simulation for a planar dielectric barrier discharge (DBD), it was observed that the high-frequency driving voltage confines the ions in the plasma because of a shorter RF period than the ion transit time. For two-dimensional surface dielectric barrier discharges, a fluid simulation is performed to investigate the characteristics of RF discharges from 1MHz to 40 MHz. The ratio of the peak density to the average density decreases with the increasing frequency, and the spatiotemporal discharge patterns change abruptly with the change in the ratio of ion transit time to the RF period.
Hyowon Bae,Ho-Jun Lee,Hae June Lee 한국진공학회(ASCT) 2016 Applied Science and Convergence Technology Vol.25 No.6
The discharge characteristics of pulse-driven coplanar micro barrier discharges for an ultraviolet (UV) light source using Ne-Xe mixture have been investigated using a two-dimensional fluid simulation at near-atmospheric pressure. The densities of electrons, the radiative excited states, the metastable excited states, and the power loss are investigated with the variations of gas pressure and the gap distance. With a fixed gap distance, the number of the radiative states Xe<SUP>*</SUP>(<SUP>3</SUP>P₁) increases with the increasing driving voltage, but this number shows weak dependency on the gas when that pressure is over 400 Torr. However, the number of the radiative states increases with the increase of the gap distance at a fixed voltage, while the power loss decreases. Therefore, a long gap discharge has higher efficiency for UV generation than does a short gap discharge. A slight change in the electrode tilt angle enhances the number of radiative species 2 or 3 times with the same operation conditions. Therefore, the intensity and efficiency of the UV light source can be controlled independently by changing the gap distance and the electrode structure.
Bae, Hyowon,Lee, Jung Yeol,Lee, Hae June The Korean Vacuum Society 2017 Applied Science and Convergence Technology Vol.26 No.4
The discharge characteristics of the radio frequency (RF) surface dielectric barrier discharge have been simulated for the investigation of the ratio of the ion transit time to the RF period. From one-dimensional particle-in-cell (PIC) simulation for a planar dielectric barrier discharge (DBD), it was observed that the high-frequency driving voltage confines the ions in the plasma because of a shorter RF period than the ion transit time. For two-dimensional surface dielectric barrier discharges, a fluid simulation is performed to investigate the characteristics of RF discharges from 1 MHz to 40 MHz. The ratio of the peak density to the average density decreases with the increasing frequency, and the spatiotemporal discharge patterns change abruptly with the change in the ratio of ion transit time to the RF period.
배효원 ( Bae Hyowon ) 국립중앙박물관 2022 고고학지 Vol.28 No.0
일제강점기 가야고분은 신공황후 삼한정벌 기사나 임나일본부 기사를 근거로 고대 일본의 한반도 지배를 주장하는 ‘남선경영론’이나 ‘임나일본부’의 실체를 고증하기 위해 일본인에 의해 주도적으로 조사되었다. 이러한 이유로 창녕·함안·고령 등의 왕릉급 고분이 다수 조사되었으며 국립중앙박물관의 일제강점기 자료 공개사업을 통해 세상에 알려지게 되었다. 자료 공개만으로도 의미 있는 작업이지만 나아가 이를 재검토하고 재평가하여 일제강점기 일본인에 의한 고고학적 활동이 한국고고학의 범주로 평가될 수 있는가에 대한 답을 구해야 할 것이다. 이는 연구자 개개인의 역할이며 이러한 성과들이 모여 한국고고학의 새로운 지평을 열 수 있을 것이다. 나아가 일제강점기 자료의 활용 방안을 모색하는 것 또한 우리 세대의 몫이며 남겨진 과제이다. The Gaya tomb during the Japanese colonial era was excavated to prove the “Theory of South Joseon Management”(南鮮經營論) and “Theory of Imna-ilbonbu”(任那日本府說), which argued historical text called Records of the Nihon shoki(日本書紀). For this reason, several royal tombs such as Changnyeong(Ch’angnyŏng), Haman, and Goryeong(Goryŏng), were excavated, and The Gaya tomb was released to the public through the information disclosure project of the Japanese colonial era led by the National Museum of Korea. The disclosure of the data is meaningful, and the next step with this disclosure should be reviewing and re-evaluating if archaeological activities conducted by the Japanese during the Japanese colonial era could be evaluated as a category of Korean archaeology. This is up to each researcher's ability, and these achievements will open a new horizon for Korean archaeology. Furthermore, it is our generation's responsibility to explore ways to utilize data from the Japanese colonial era.
배상윤(Sang-Yoon Bae),서효원(HyoWon, Suh),제임스모리슨(James R. Morrison) (사)한국CDE학회 2016 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2016 No.동계
Because of complexity of plant modularization process, decision making is one of the essential issue. However, there are a few studies have been conducted about cost breakdown structure and cost optimization for plant modularization and construction field. This research analyze plant modularization process and reveal that the existing EPC (Engineering, Procurement, Construction) process can be decomposed to EPFTC (Engineering, Procurement, Fabrication, Transportation, Construction) for modeling modularization process, and construct the cost breakdown structure based on that process. Finally, this research also propose the cost optimization model based on constructed cost breakdown structure.
근적외선 분광분석법을 이용한 열수탄화 강제냉각 공정을 거친 리그닌 바이오챠 분석
황운택 ( Untaek Hwang ),김현빈 ( Hyunbin Kim ),배준수 ( Junsoo Bae ),황성윤 ( Sungyun Hwang ),최종규 ( Jonggyu Choi ),박용건 ( Yonggun Park ),최인규 ( Ingyu Choi ),곽효원 ( Hyowon Kwak ),황성욱 ( Sungwook Hwang ),여환명 ( Hwanmyeo 한국목재공학회 2020 한국목재공학회 학술발표논문집 Vol.2020 No.1
열수탄화 후 강제냉각 공정을 통해 크라프트 리그닌 바이오챠를 제조하고 근적외선(Near Infrared ray, NIR)을 이용하여 분석하였다. 크라프트 리그닌을 증류수 140ml와 각각 2.8g, 5.6g, 8.4g(질량비 1:50, 2:50, 3:50)으로 혼합하여 가열 용기에서 200°C로 1시간, 2시간, 3시간, 5시간, 10시간 동안 가열하였다. 반응 과정에서는 온도와 전력량을 시간에 따라 기록하였다. 가열 후 생성물은 얼음물을 이용하여 식힌후 감압 여과한 뒤 항온항습기에서 60°C로 건조하였다. 이후 막자사발을 이용하여 곱게 갈아 20°C, 60RH% 조건에서 바이알에 보관하였다. 공정을 거친 리그닌 시료는 성분 분석, BET, SEM, NIR 분광분석을 통해 분석하였다. 획득된 NIR spectrum은 Unscrambler X 프로그램을 이용하여 SNV, Savitzky-Golay 2nd derivatives 수학 전처리 후 성분 분석, BET, SEM 분석 결과와 비교·분석되었다. 열수처리 유무 여부에대한 판정과 원소분석을 통해 얻은 탄소비율 추정을 부분최소자승법으로 분석한 결과 R-square 값이 각각 0.93과 0.91로 높은 정확도를 보였다. 1400-1500nm 파장대 등에서의 NIR 스펙트럼 피크값의 감소를 통해리그닌 작용기변화가 감지되었다. 본 연구에서 시도된 NIR 분광분석법에 의해 신속하고 비파괴적인 리그닌 열수처리 유무 여부 판정과 원소 함량비 검량이 기대된다.