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Top-down fabrication of 4H-SiC nano-channel field effect transistors.
Kang, Min-Seok,Lee, Jung-Ho,Bahng, Wook,Kim, Nam-Kyun,Koo, Sang-Mo American Scientific Publishers 2014 Journal of Nanoscience and Nanotechnology Vol.14 No.10
<P>4H-SiC nano-channel field effect transistors (FETs) with various widths of 3 μm-50 nm have been fabricated by 'top-down' approach using electron-beam lithography process. It has been demonstrated that the gate controllability of the SiC FETs is improved with decreasing channel width. In the fabricated devices the threshold voltage V(th) for the 50 nm-width nano-channel FETs shows a positive shift (δV(th) = 1.4 V) with respect to that of the reference FETs. The on-current degradation of the SiC nano-channel FETs is found to be 1.5 times lower than that of the reference FETs at elevated temperatures up to 450 K. This attributed to the improved heat dissipation of the nano-channel structure with a large surface to volume ratio.</P>
Sang-Kuk Kim,Hong-Jib Choi,Sang-Mo Kang,In-Jung Lee,Hak-Yoon Kim 韓國作物學會 2011 Korean journal of crop science Vol.56 No.1
Proximate chemical components (protein, oil, carbohydrate, ash, fiber, and starch) were determined from tubers grown in upland and wetland conditions. The contents of crude protein, oil, carbohydrate, and starch were higher in upland condition than in wetland condition. Eight gibberellins were commonly identified and quantified in leaves and tuber of chufa grown in wetland and upland field during growing season. Gibberellin content was always higher specifically in the leaves and tubers grown in wetland condition than in those grown in upland condition. The current knowledge of gibberellin biosynthesis suggests that the two endogenous bio-active gibberellins both GA1 and GA4 are differently metabolized according to cultural conditions. Major gibberellin biosynthesis route is ascertained dominantly the non C-13 hydroxylation pathway leading GA4 in chufa plants.
Evaluation of Haemagglutinin Content by RP-HPLC to Generate Pandemic Influenza Vaccine
Kang, Hyunkyung,Roh, Hang Sik,Song, Hyemin,Lee, Kwangmoon,Chung, Seung-Tae,Ban, Sang-ja,Mo, In Pil,An, Beum-Soo,Ahn, Chi-Young Korean Society of ToxicologyKorea Environmental Mu 2016 Toxicological Research Vol.32 No.4
The potency of influenza vaccine is determined based on its hemagglutinin (HA) content. In general, single radial immunodiffusion (SRID) assay has been utilized as the standard method to measure HA content. However, preparation of reagents for SRID such as antigen and antibody takes approximately 2~3 months, which causes delays in the development of influenza vaccine. Therefore, quantification of HA content by other alternative methods is required. In this study, we measured HA contents of H1N1 antigen and H1N1 influenza vaccine by reverse phase-high performance liquid chromatography (RP-HPLC) methods. The presence of HA1 and HA2 was investigated by silver staining and Western blot assay. In addition, accuracy and repeatability of HA measurement by RP-HPLC were evaluated. Comparison of HA concentration by SRID and RP-HPLC revealed a precise correlation between the two methods. Our results suggest that RP-HPLC assay can replace SRID in the event of a pandemic flu outbreak for rapid vaccine development.
Statistical Model of Effective Impact Speed based on Vehicle Damages in Case of Rear-End Collisions
Sung Mo Kang,Joo Hwan Kim 한국데이터정보과학회 2008 한국데이터정보과학회지 Vol.19 No.2
In this study, we measure damage depth and calculate effective impact speed in case of rear-end collision using real car insurance data. We study the relationship between demage depth and effective impact speed, and present statistical model for these two variables. In our real data study, 3~degree polynomial equation model is better fit to effective impact speed and demage depth than the simple linear model that are estimated in previous other studies. Damage depth is a major factor to see the extent of impact in a car collision, and by using this equation, it is possible to evaluate the severity of driver`s injury.
Highly size-controlled synthesis of metal nanoclusters by inert-gas condensation for nano-devices.
Kang, Il-Suk,Seo, Hyun-Sang,Kim, Deuk-Han,Lee, Taek-Yeong,Yang, Jun-Mo,Hwang, Wook-Jung,Ahn, Chi Won American Scientific Publishers 2010 Journal of Nanoscience and Nanotechnology Vol.10 No.5
<P>Metal nanoclusters were fabricated by inert-gas condensation in a sputtering reactor. From transmission electron microscopy, it was confirmed that copper nanoclusters with a high degree of monodispersity in size of about 5 nm were successfully produced. The conductance of the percolated nanocluster film was measured. In order to incorporate nano-scale arrangement characterizations in nano-devices being operated in air, aging experiments of the specimen after long time in air were carried. Negative temperature coefficient of resistance suggests that surface native copper oxide in core-shell structured nanoclusters was mainly responsible for the conductance, because copper oxide is known as semiconductor. After aged at higher than 100 degrees C, the conductance at room temperature didn't return to the original value. This irreversible phenomenon might be due to coarsening and/or coalescence of copper nanoclusters.</P>