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Articles by S.H. Park
Total Records ( 2 ) for S.H. Park
  J.H. Kwon , J. Lee , C. Waje , J.J. Ahn , G.R. Kim , H.W. Chung , D.H. Kim , J.W. Lee , M.W. Byun , K.S. Kim , K.S. Kim , S.H. Park , E.J. Lee and D.U. Ahn
  Irradiated red ginseng powder (2.4 kg) in commercial bottles was transported from Korea to Iowa State University (USA) via air- (10 days) and sea-cargos (50 days) to prove its qualities and identity. The microbial loads of transported samples by both methods after 5 kGy irradiation were reduced from 106 to 103 CFU/g in total aerobic bacteria and from 20 CFU/g (minimum detection level) to negative in coliforms, respectively, which are in accordance with Korean microbial standard for ginseng powders. Sea-transported irradiated samples showed the increased thiobarbituric acid reactive substances (TBARS) and Hunter's a (red) value, but sensory qualities of all the red ginseng samples were not significantly different depending on irradiation and transportation means. Irradiated samples could be identified from the non-irradiated ones by the analysis of photostimulated luminescence, thermoluminescence, and electron spin resonance. This trial proved the feasibility of inter-country transportation of irradiated red ginseng powder.
  J.S. Park , T. Minegishi , S. Ahn , S.H. Park , S.K. Hong , H. Jeon , I.H. Im , J.H. Chang and T. Yao
  Two-dimensional periodically polarity-inverted (PPI) ZnO structures were fabricated on (0001) Al2O3 substrates using plasma assisted molecular beam epitaxy. Holographic lithography was carried out for the realization of nanometer-scale patterns of CrN which was obtained by nitridation of Cr metal. The PPI ZnO structures consisted of Zn-polar regions grown on CrN and O-polar regions grown on Zn-terminated AlN/Al2O3. The periodical polarity inversion was confirmed by voltage-piezo response curves and contrast in the piezo response microscopy images. A diffraction pattern of the fabricated PPI ZnO sample was observed when a He-Ne laser beam was incident on the sample surface.
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