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고영옥,이종옥,신동국 진주산업대학교 농업기술연구소 2002 農業技術硏究所報 Vol.15 No.-
현대인의 기호에 맞는 지리산 반발효차(구황차)를 개발하기 위하여 옛날 제차법이 보존되어 있는 절간의 기술에 새로운 과학기법을 접목하여 개발한 차의 결과는 다음과 같다. 1. 총질소함량은 고온황토방의 녹차에 비하여 황토방의 녹차의 함량이 다소 높았다. 2. 총아미노산, 카페인 및 비타민-C함량은 황토방과 고온황토방의 제차방법에 따른 차이는 그다지 높지 않았다. 3. Geraniol함량은 황토방의 녹차(2회차)가 2.4%이며, 고온황토방의 녹차에 비하여 높은 경향이었다. 4. Pyrrole류의 pyrrole성분은 고온황토방이 다소 높았으나, ethyl pyrrole는 황토방에서 조성비가 현저히 높았다. 5. 꽃향기에 기여하는 Jasmone함량은 고온황토방의 녹차에서 조성비가 다소 높았다. In the order to taste go well with half-ferment green tea(kuhwang green tea) in the products of Mt. jiri garden were made try to development for modern people, according to once upon time there buddhist temple preserve course of green tea processing was approachable to new science of skill . The results were summarized as follows: 1. The amount of total nitrogen in green tea was high for yellow soil room than high temperature of yellow soil room 2. The amounts of total amino acid, caffeine and Vit. C in green tea were not difference according to yellow soil according to making method 3. The amount of geraniol in green tea was high tendency of yellow soil room(2.4%) than high temperature of yellow soil room 4. The component of pyrrole, in green tea was a few high such as high temperature yellow soil room, but the ethyl pyrrole was high ratio with yellow soil room. 5. The aroma component of amount of jasmone in green tea was a few high with high temperature of yellow soil room
Dong Guk Ko,Seung Jong Ko,Eun Kyung Choi,Sang Guen Min,Sang Hyub Oh,Jinsang Jung,Byung Moon Kim,Ik-Tae Im IEEE 2014 IEEE transactions on semiconductor manufacturing Vol.27 No.4
<P>The purpose of this paper was to estimate the reduction efficiency of an abatement system for perfluorocarbon (PFC) gases produced during semiconductor manufacturing processes. The reduction efficiency currently used in the semiconductor industry, the destruction and removal efficiency (DRE), considers only the destruction ratio of PFC gases. A method estimating the reduction efficiency, which in addition to measure the destruction ratio also considers the energy consumption and byproducts produced during the treatment of PFC gases, was proposed in this paper; this efficiency was defined as the net reduction efficiency (NRE). For the estimation of the reduction efficiency, measurements were made using a plasma-wet type abatement system installed in an actual semiconductor manufacturing plant. The destruction ratio of the PFC gases was measured using Fourier transform infrared spectroscopy and quadrupole mass spectroscopy. The energy consumption was measured using an electricity meter. Based on these measurements, the DRE and the NRE of the PFC gases were calculated and compared. The results indicated that the DRE showed high reduction efficiency while the NRE showed lower values.</P>
고동국(Dong Guk Ko),김민수(Min Soo Kim) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
In this study, we propose a method to maximize the heat dissipation performance of a UCD lamp that realizes an 8-wavelength spectrum with sunlight characteristics by using mixed metal and special xenon gas. The aspect ratio and radius of fin were analyzed by analytical method. The minimum mesh size used for the heat dissipation fin was 0.02 mm and the number of mesh was approximately 11,000. In order to understand the effect of the aspect ratio and the radius, the heat transfer area of the fin was kept constant at 4 mm². The fin had an aspect ratio of 1.00(2.00 mm: 2.00 mm(basic model)), 1.41(1.70 mm: 2.40 mm), 1.80(1.50 mm: 2.70 mm), 0.56(2.40 mm: 1.70 mm), and 0.29(2.70 mm: 1.50 mm), respectively. The radius of fin was 0 mm, 0.3 mm, 0.6 mm, 0.9 mm and 1.2 mm, respectively. The heat flux and the heat flux time applied to the fin were 1×10<SUP>5</SUP> W/㎡ and 0.1 second, 0.2 second, 0.5 second, 1 second, 2 seconds, 5 seconds and 10 seconds, respectively. The heat dissipation performance of the UCD lamp was the best when the aspect ratio and radius of the fin were 1.8 and R=1.2 mm.
고동국(Dong Guk Ko),김민수(Min Soo Kim) 대한기계학회 2018 大韓機械學會論文集B Vol.42 No.8
본 연구에서는 UCD 램프의 방열성능에 대한 방열핀의 종횡비와 반경의 영향을 해석적 방법을 이용하여 분석하였으며, 해석에 사용된 격자수와 크기는 각각 11,000개와 0.02 mm이다. 방열핀의 전열면적은 4 ㎟로 일정하게 유지시켰으며, 방열핀의 종횡비는 각각 1.0(기본모델), 1.8, 1.41, 0.56 및 0.29이다. 또한 방열핀의 반경 R은 각각 0.0 mm, 0.3 mm, 0.6 mm, 0.9 mm 및 1.2 mm이다. 핀에 가해진 열의 유속과 시간은 각각 1×105 W/㎡과 0.1 초, 0.2 초, 0.5 초, 1 초, 2 초, 5 초 및 10 초이다. 결과적으로 UCD 램프 방열의 방열성능은 핀의 종횡비와 반경이 각각 1.8과 1.2 mm일 경우 가장 우수하였으며, 기본모델보다 5.7% 상승하였다. In this study, the effects of the aspect ratio and radius of the heat dissipation fin on the heat dissipation performance of a UCD lamp were analyzed using an analytical method. The minimum grid size and number of meshes of the fin used for numerical analysis were 0.02 mm and 11,000, respectively. The heat transfer area of the fin was kept constant at 4 mm². The aspect ratios of the fin were 1.0 (base model), 1.8, 1.41, 0.56, and 0.29, and the respective radii of the fin were R=0.0 mm, 0.3 mm, 0.6 mm, 0.9 mm, and 1.2 mm. The heat flux and heat flux time applied to the fin were 1×105 W/㎡ and 0.1 s, 0.2 s, 0.5 s, 1 s, 2 s, 5 s, and 10 s, respectively. The heat dissipation performance of the UCD lamp was the best when the aspect ratio and radius of the fin were 1.8 and 1.2 mm, respectively, and showed an increase of 5.7% from the base model.
3D 프린터를 활용한 호흡계의 융합 수업이 초등학생의 과학 탐구 능력, 창의적 문제해결력, 과학 흥미도 및 STEAM 프로그램 만족도에 미치는 영향
고동국 ( Ko Dong Guk ),홍승호 ( Hong Seung-ho ) 한국초등과학교육학회 2018 초등과학교육 Vol.37 No.3
The aims of this study are to develop the STEAM program focused ‘3D printing for respiratory system’ and to ascertain its influence on elementary student’s science process skills, creative problem solving abilities and scientific interest. The developed STEAM program was applied to 5th grade students of O elementary school located in J city. As a result of applying the STEAM program, the experimental group of the STEAM program class improved significantly in creative problem solving abilities and scientific interest than the control group of the theoretical class. The result of learner satisfaction survey of the STEAM program was high. Meanwhile, there was no significant difference in science process skills between the two groups. Therefore, the STEAM program class with the theme of ‘3D printing for respiratory system’ could be meaningful works to encourage students’ interest as well as their creative problem solving ability and scientific interest. In future, continuous and systematic studies on STEAM programs focused on ‘structure and function of our body’ are needed for elementary students’ cognitive and affective developments.
광 조사에 따른 온도분포를 이용한 생체조직 내 비정상조직 탐지에 대한 연구
고동국(Dong Guk Ko),임익태(Ihk-Tae Im) 대한기계학회 2017 大韓機械學會論文集B Vol.41 No.5
본 연구에서는 비정상조직(파라핀)을 가진 생체조직에 광을 조사하고 그에 따른 조직의 표면온도와 비정상조직 주위에서의 온도분포를 실험과 해석적 방법을 통해 분석하였다. 파라핀을 이용하여 비정상 조직을 모사한 후 조사하는 광의 파장과 시간을 변화시키면서 조직 주위에서의 온도를 K형 열전대를 사용하여 측정하였다. 또한 전산열전달 기법을 이용하여 해석적으로 조직에 대한 온도분포를 예측하였다. 정상조직과 비정상조직의 주위에서의 온도는 차이가 있었으며, 비정상조직이 있는 경우 표면과 조직 주위의 온도가 높게 나타났다. In this study, the characteristics of the temperature generated by light irradiation, on the surface of a biological tissue with an abnormal tissue part (paraffin) and at the surroundings of the abnormal tissue were studied by numerical and experimental methods. The temperature in the tissue was solved using the computational heat transfer and was compared with the temperature measured with thermocouples. The effects of the light wavelength and the irradiation time on the temperature distribution were analyzed. As a result, the temperature distribution from the irradiation of light in the biological tissue was different when there was an abnormal tissue part. The temperature in the biological tissue with the abnormal tissue part was higher than in a normal tissue.
저온 탄화로 실링 챔버내 유로의 형상변화에 따른 내부유동 특성에 관한 연구
고동국(Dong-Guk Ko),압드엘모타립 하마다(Hamada Abdelmotalib),김민우(Min-Woo Kim),이교우(Gyo-Woo Lee),임익태(Ik-Tae Im) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
This paper studies the flow characteristics inside the low-temperature carbonization furnace(LTF) including sealing chamber with labyrinth. The flow behavior inside the furnace was analyzed according to different labyrinth shapes. The effects of labyrinth baffle number, and clearance between upper and lower baffles in the sealing chamber were investigated. The large vortex and recirculation region are generated in the chamber when the baffles of the upper and lower surfaces in the labyrinth are maintained at regular intervals. As a result, the gas discharge flow rate can be reduced by 60.8% when the flow distance between baffle and baffle in labyrinth is reduced to 25% of the baffle length.