• Title/Summary/Keyword: S Technology

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Coherent X-ray Diffraction Imaging with Single-pulse Table-top Soft X-ray Laser

  • Kang, Hyon-Chol;Kim, H.T.;Lee, S.K.;Kim, C.M.;Choi, I.W.;Yu, T.J.;Sung, J.H.;Hafz, N.;Jeong, T.M.;Kang, S.W.;Jin, Y.Y.;Noh, Y.C.;Ko, D.K.;Kim, S.S.;Marathe, S.;Kim, S.N.;Kim, C.;Noh, D.Y.;Lee, J.
    • Proceedings of the Optical Society of Korea Conference
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    • 2008.02a
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    • pp.429-430
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    • 2008

  • We demonstrate coherent x-ray diffraction imaging using table-top x-ray laser at a wavelength of 13.9nm driven by 10-Hz ti:Sapphire laser system at the Advanced Photonics Research Institute in Korea. Since the flux of x-ray photons reaches as high as $10^9$ photons/pulse in a $20{\times}20{\mu}m^2$ field of view, we measured a ingle-pulse diffraction pattern of a micrometer-scale object with high dynamic range of diffraction intensities and successfully reconstructed to the image using phase retrieval algorithm with an oversampling ratio of 1:6. the imaging resolution is $^{\sim}150$ nm, while that is much improved by stacking the many diffraction patterns. This demonstration can be extended to the biological sample with the diffraction limited resolution.

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Triode-Type Field Emission Displays with Carbon Nanotube Emitters

  • You, J.H.;Lee, C.G.;Jung, J.E.;Jin, Y.W.;Jo, S.H.;Nam, J.W.;Kim, J.W.;Lee, J.S.;Jang, J.E.;Park, N.S.;Cha, J.C.;Chi, E.J.;Lee, S.J.;Cha, S.N.;Park, Y.J.;Ko, T.Y.;Choi, J.H.;Lee, S.J.;Hwang, S.Y.;Chung, D.S.;Park, S.H.;Kim, J.M.
    • Journal of Information Display
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    • v.2 no.3
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    • pp.48-53
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    • 2001

  • Carbon nanotube emitters, prepared by screen printing, have demonstrated a great potential towards low-cost, largearea field emission displays. Carbon nanotube paste, essential to the screen printing technology, was formulated to exhibit low threshold electric fields as well as an emission uniformity over a large area. Two different types of triode structures, normal gate and undergate, have been investigated, leading us to the optimal structure designing. These carbon nanotube FEDs demonstrated color separation and high brightness over 300 $cd/m^2$ at a video-speed operation of moving images. Our recent developments are discussed in details.

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Application of Collagenolytic Proteases from Bacillus subtilis B13 and Bacillus siamensis S6 for Tenderizing Goat Meat during Wet Aging

  • Supaluk Sorapukdee;Wiwat Samritphol;Papungkorn Sangsawad;Pussadee Tangwatcharin
    • Food Science of Animal Resources
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    • v.44 no.2
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    • pp.430-442
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    • 2024

  • This research aimed to assess the effect of collagenolytic proteases from Bacillus subtilis B13 and Bacillus siamensis S6 for tenderizing goat meat during wet aging. Collagenolytic proteases B13 and S6 were prepared at 5 U/mL of collagenolytic activity before injecting into goat meat with 10% (v/w) of initial weight. The control sample was injected with distilled water and used as a negative control. The injected meats were placed in vacuum-sealed bags and wet aged at 4℃ for 0, 3, 5, 7, 14, and 21 days. Thereafter, total aerobic count and physicochemical quality were elucidated. Both enzyme-treated samples from B13 and S6 aged for 5 days showed an acceptable microbial quality with lower than 5.7 Log CFU/g. These conditions produced the tender meats by the reduction in shear force accounting for 30% for B13 and 26% for S6 as compared to the control. Moreover, the enzyme-treated samples showed lower values of hardness, gumminess, and chewiness, with higher springiness and trichloroacetic acid-soluble peptides than the control (p<0.05). The detrimental impact on cooking loss and lipid oxidation was not found. Enzyme-injected meat had a lower cooking loss than the control (p<0.05) with no significant difference in lipid oxidation (p>0.05). Notably, meats treated with B13 and S6 were lower in CIE L* value as compared to the control (p<0.05) with no significant impact on CIE a* and CIE b* (p>0.05). These results suggested that these two collagenolytic proteases could enhance the quality of goat meat in terms of tenderness and reduce the aging time for meat tenderization.

  • https://doi.org/10.5851/kosfa.2023.e79 인용 PDF HTML

Investment in Information Technology and Performance of Securities Companies in Korea (증권사의 정보기술투자가 기업성과에 미치는 영향에 관한 연구)

  • Shin, Yong-Jae
    • Management & Information Systems Review
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    • v.25
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    • pp.43-68
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    • 2008

  • From intuitional viewpoint many researchers have been considering that information technology investment serves to increase the productivity and the profitability of firm. But the empirical studies that have examined the relationship between information technology investment and firm performance have reported mixed findings. In spite of that, recently there has been growing recognition of the importance of assessing information technology investment in determining future performance of firms. This study examines the relationship between investment in information technology and performance of securities companies in Korea. I use Tobin's Q, a financial market-based measure of firm performance and investigates the pure effect of information technology investment on firm performance after controlling for a variety of firm specific variables which may affect on firm performance. This study finds that information technology investment have a significantly positive association with Tobin's Q. This result implicates that information technology investment contributes to a firm's future performance potential.

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