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배영호,이현우,홍성태,서기영,차영문,권순걸 慶南大學校 附設 工業技術硏究所 1992 硏究論文集 Vol.10 No.-
이 논문은 MOSFET로 구성된 등가 Half-bridge형 고주파공진형 인버어터에 대해 기술하고 있다. 시분할 방식에 의한 게이트회로를 구성하여 구동함으로써 출력단에는 두개의 인버어터에서 동작되는 순시위상이 합성되어 있어 나타나므로 부하단 출력주파수는 소자의 수위칭주파수에 대해 두배가 되고 수위칭 손실이 경감되어 소자의 평균전류가 증가한다. This paper proposes a high frequency resonant inverter consisting of equivalent half bridge model using MOSFET. In this paper time-sharing control method is applied. as a result the output frequency is two times as high as switching frequency of device and average current of device is increased because of decreasing switching loss.
감자 養液 pH 및 中間收穫 處理가 塊莖收量에 미치는 影響
朴良門,趙南棋,金聖培,金基澤 濟州大學校亞熱帶農業硏究所 1996 亞熱帶農業硏究 Vol.13 No.-
summaryThis experiment was carried out investigate the effect of solution pH stress and medium harvesting the growth,tuber yield of potato(Soamum tuberosum L.). The results obtained are summarized as follows ; 1.Growth response of potato grown at 60 days after transplaning were not siginficant differences among treatement.Stem length and weight of stem-leaf per plant at 80 days after transplaning were reduced at the treatment of solution pH stress. 2.Stolon length and number of tuber per plant at 80 days after transplaning were greater at the treatment of medium havest as of 57cm and 56.9 tubers. 3.Number of stolon and weight of tubers per plant were not siginificant differences among treatment
배문기 ( Mun Ki Bae ),김태규 ( Tae Gyu Kim ) 한국열처리공학회 2021 熱處理工學會誌 Vol.34 No.2
The crystal grains of polycrystalline diamond vary depending on deposition conditions and growth thickness. The diamond thin film deposited by the CVD method has a very rough growth surface. On average, the surface roughness of a diamond thin film deposited by CVD is in the range of 1-100 um. However, the high surface roughness of diamond is unsuitable for application in industrial applications, so the surface roughness must be lowered. As the surface roughness decreases, the scattering of incident light is reduced, the heat conduction is improved, the mechanical surface friction coefficient can be lowered, and the transmittance can also be improved. In addition, diamond-coated cutting tools have the advantage of enabling ultra-precise machining. In this study, the surface roughness of diamond was improved by thermal diffusion reaction between diamond carbon atoms and ferrous metals at high temperature for diamond thin films deposited by MPCVD. (Received March 4, 2021; Revised March 15, 2021; Accepted March 19, 2021)
표면개질에 의한 헤테로에피텍시 단결정 다이아몬드의 결정성 향상
배문기 ( Mun Ki Bae ),김민수 ( Min Su Kim ),김성우 ( Seong Woo Kim ),윤수종 ( Su Jong Yoon ),김태규 ( Tae Gyu Kim ) 한국열처리공학회 2020 熱處理工學會誌 Vol.33 No.3
Recently, many studies on growth of single crystal diamond using MPECVD have been conducted. The heteroepitaxial method is one of the methods for growing diamonds on a large-area substrate, and research on synthesis of single crystal diamonds using SrTiO<sub>3</sub>, MgO, and sapphire substrates has been attempted. In addition, research is being conducted to reduce the internal stress generated during diamond growth and to improve the crystallinity of the diamond. The compressive stress generated therein causes peeling and bowing from the substrate. This study aimed to synthesize heteroepitaxial single crystal diamonds with high crystallinity by surface modification. A diamond thin film was first grown on a sapphire/Ir substrate by MPECVD, and then etched with H<sub>2</sub> gas to modified the morphology and roughness of the surface. A secondary diamond layer was grown on the surface, and the internal stress, crystallinity of the diamond were investigated. As a result, the fabrication of single crystal diamonds with improved crystallinity was confirmed. (Received May 10, 2020; Revised May 15, 2020; Accepted May 22, 2020)
Kim, Yong-Ki,Paek, Mun-Ki,Bae, Yang-Seop Korean Society of Applied Entomology 2002 INSECTA KOREANA Vol.19 No.2
In a review of the genus Pyrausta (Lepidoptera: Crambidae: Pyraustinae) in the Korean peninsula, 12 species including three species of North Korea are recognized. Among them, P. nigrimaculata Bae et Kim is described as new to science, and P. chrysitis Butler is reported for the first time from Korea. A Key to species of the genus, based on the external characters, is provided. Morphological descriptions with illustrations of the genitalia for the all known species are given.
Kim, Yong-Ki,Paek, Mun-Ki,Bae, Yang-Seop 한국응용곤충학회 2002 Insecta Koreana Vol.19 No.2
In a review of the genus Pyrausta (Lepidoptera: Crambidae: Pyraustinae) in the Korean peninsula, 12 species including three species of North Korea are recognized. Among them, P. nigrimaculata Bae et Kim is described as new to science, and P. chrysitis Butler is reported for the first time from Korea. A Key to species of the genus, based on the external characters, is provided. Morphological descriptions with illustrations of the genitalia for the all known species are given.