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Interfacial Reactions in Ni/6H-SiC at Low Temperatures
Lim, Suhee,Oh, Jin-Soo,Kwon, Yena,An, Byeong-Seon,Bae, Jee-Hwan,Kim, Tae-Hoon,Park, Min-Ho,Kim, Hyoung-Sub,Yang, Cheol-Woong American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.10
<P>We report the reaction between thin Ni films and 6H-SiC substrates at relatively low temperatures (<550 degrees C) and the diffusion behavior of carbon during silicide formation. The phase transformation and distribution of chemical constituents were investigated using transmission electron microscopy. About 60 nm of Ni was deposited on 6H-SiC using an e-beam evaporator, and samples were then annealed using a rapid thermal annealing process. In a Ni/SiC sample annealed at 450 degrees C, while there are no Ni-silicides present, a graphite inter layer is formed between the SiC substrate and Ni. In addition, Si is released by SiC decomposition diffusing to the Ni layer to form a Ni(Si) solid solution. As the annealing temperature increases to 550 degrees C, a phase transformation begins, with the Ni-silicides going from Ni3Si to Ni31Si12 and N2Si over time. At the very beginning of the Ni/SiC reaction, carbon atoms liberated from SiC diffuse through un-reacted polycrystalline Ni towards the external surface and form a graphite layer. During the silicidation reaction, carbon atoms (a decomposition product formed after the Ni/SiC reaction) are distributed inside the silicide layer and precipitate in the form of graphite.</P>
임홍섭,유봉환,공재향,김홍원 한국공작기계학회 2004 한국생산제조학회지 Vol.13 No.1
In order to investigate the characteristics of diamond wheel grinding of ceramic materials, grinding resistance, surface roughness of ground surface and image of grinding wheel were acquired wing experimental method. Through the experiments, this makes it possible to observe grinding wheel behavior by grinding resistance, surface roughness and cutting edge ratio. In case of Al₂O₃ cutting edge ratio is bigger than that of ZrO₂ and Si₃N₄. That's because Al₂O₃has a characteristic of low fracture toughness and bending stress.
임우섭(Lim, Woo-Sub),사공성호(SaKong, Seong-Ho),이장원(Lee, Jang-One),정재한(Jeong, Jae-Han),남준석(Nam, Jun-Seok),남동군(Nam, Dong-Gun),나용운(Na, Yong-Un),박경환(Park, Kyung-Hwan),이내훈(Lee, Nae-Hun) 한국화재소방학회 2011 한국화재소방학회 학술대회 논문집 Vol.2011 No.추계
압축공기 포는 공기포혼합기를 사용하여 약제와 물 그리고 압축공기를 혼합하여 방출하는 방식으로, 물의 확보가 곤란한 장소라도 소화 효율을 높이는 시스템으로서 주목되고 있으며, 현재 해외 선진국에서는 이미 개발되어 상용화 되어있다. 본 연구에서는 국제적 기준에 따른 압축공기포소화설비의 성능평가시험을 위해 미국, 캐나다 등에서 채택한 UL-162 시험방법을 적용하여 시험을 수행하였으며, 그 결과 기존의 포소화시스템과 압축공기포소화시스템의 성능비교시험을 통해 압축공기포가 기존의 포소화방식 보다 소화성능이 우수한 것으로 나타났다.
( Chang Hwan Lee ),( Kyung Il Kim ),( Jeong Sub Lim ),( Yoon Hyoung Lee ) 서울대학교 인지과학연구소 2015 Journal of Cognitive Science Vol.16 No.2
Language analysis methodologies such as LIWC and KLIWC, its Korean version, have been used widely in psychology and other social sciences. Given this context, this review aims to overview previous psychological findings based on the language analysis methodologies and compare findings deriving from LWIC and KLIWC. More specifically, this review examines important results in clinical psychology, developmental psychology, personality psychology, cognitive psychology, and other social sciences. Further, this review evaluates major debates regarding the language analysis methodologies and provides a possible future direction for using the methodologies in the cognitive science field.
Diversity of Fungal Endophytes in Various Tissues of Panax ginseng Meyer Cultivated in Korea
Young-Hwan Park,Soon-Gu Lee,Doek Jong Ahn,Tae Ryong Kwon,Sang Un Park,Hyoun-Sub Lim,Hanhong Bae 고려인삼학회 2012 Journal of Ginseng Research Vol.36 No.2
Endophytic fungi were isolated from various tissues (root, stem, petiole, leaf, and fl ower stalk) of 3- and 4-year-old ginseng plants (Panax ginseng Meyer) cultivated in Korea. The isolated endophytic fungi were identifi ed based on the sequence analysis of the internal transcribed spacer (ITS), 1-5.8-ITS 2. A morphological characterization was also conducted using microscopic observations. According to the identification, 127 fungal isolates were assigned to 27 taxa. The genera of Phoma, Alternaria and Colletotrichum were the most frequent isolates, followed by Fusarium, Entrophospora and Xylaria. Although 19 of the 27 taxa were identifi ed at the species level, the remainder were classifi ed at the genus level (6 isolates), phylum level (Ascomycota, 1 isolate), and unknown fungal species (1 isolate). Endophytic fungi of 13 and 19 species were isolated from 3- and 4-year-old ginseng plants, respectively, and Phoma radicina and Fusarium solani were the most frequently isolated species colonizing the tissues of the 3- and 4-year-old ginseng plants, respectively. The colonization frequency (CF%) was dependant on the age and tissue examined: the CFs of the roots and stems in the 3-year-old ginseng were higher than the CF of tissues in the 4-year-old plants. In contrast, higher CFs were observed in the leaves and petioles of 4-year-old plants, and endophytic fungi in the fl ower stalks were only detected in the 4-year-old plants. In conclusion, we detected diverse endophytic fungi in ginseng plants, which were distributed differently depending on the age and tissue examined.
Age-dependent Distribution of Fungal Endophytes in Panax ginseng Roots Cultivated in Korea
Young-Hwan Park,Young-Chang Kim,Sang Un Park,Hyoun-Sub Lim,Joon Bum Kim,Byoung-Kwan Cho,Hanhong Bae 고려인삼학회 2012 Journal of Ginseng Research Vol.36 No.3
Fungal endophytes were isolated from 1-,2-, 3- and 4- year-old ginseng roots(Panax ginseng Meyer) cultlivated in Korea. The isolated fungal endophytes were identified based on sequence analysis of the internal transcribed spacer and morphological characterization by microscopic observations. A total of 81 fungal endophytes were isolated from 24 ginseng roots. Fungal endophytes were classified into 9 different fungal species and 2 unknown species. Ginseng roots that were 1.-2,-3-, and 4- years old were colonized by 2, 6, 8 and 5 species of fungal endophytes, respectively. While Phoma radicina was the most frequent fungal endophyte in 2,-3- and 4- years old ginseng roots, Fusarium solani was the dominant endophyte in 1-year-old ginseng roots. The colonization frequencies (CF) varied with the host age. The CF were 12%, 40%, 31% and 40% for 1.-2,-3-, and 4- years old ginseng roots, respectively. We found a variety of fungal endophytes that were distributed depending on the age of ginseng plants.