Kim Soo Hyun

Learn More
Chitin benzoic acid esters were prepared using a phosphoryl mixed anhydride method. The products were characterized by 1H-NMR and FT-IR spectroscopy. FT-IR analysis revealed that the degree of O-acyl substitution of the products was in a range of 1.17-1.83. Morphological surface changes in the parent molecule due to the introduction of benzoic acid moieties(More)
Although CATV businesses provide temporary (VOD) video-on-demand services and limited supplementary services as similar as web services by launching high definition digital broadcasting, they do not provide bi-directional services and personal services through exceeding the conventional TV without applying the characteristics of IP networks. It becomes the(More)
  • 1