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심종성 ( Sim¸ Jongsung ),박철우 ( Park¸ Choelwoo ),박성재 ( Park¸ Sungjae ),강태성 ( Kang¸ Taesung ),박성은 ( Park¸ Seongeun ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.1
This study investigated fundamental properties of the recycled aggregate which was produced through recent hi-techniques of recycling. In addition, the mechanical properties of the concrete that used the recycled aggregate were compared th the concrete use the natural aggregate. The primary objective of this study was to characterize the concrete-rebar bonding properties of the recycled aggregate concrete. From the results of the mechanical property tests, as the recycled aggregate replacement ratio increased, the compressive strength and elastic modulus decreased. The recycled aggregate concrete showed about 18% decreased bond strength comparing to the concrete that had the same strength and used only the natural aggregate. The current bond strength prediction equation suggested by the design specification does not consider this decreased bong strength by the use of the recycled aggregate. Therefore, this study suggests a bond strength prediction equation for the recycled aggregate replacement ratio and consequent compressive strength reduction.
Occurrence and Biotransformation of Ochratoxin A during Pepper Sauce Fermentation
Jongsung Ahn,Han-sub Jang,Young-Jin Song,양태호,장광엽 한국응용생명화학회 2011 Applied Biological Chemistry (Appl Biol Chem) Vol.54 No.6
Gochujang, a savory and pungent fermented sauce, is a Korean ethnic food composed primarily of fermented soybean cake, red pepper powder, glutinous rice, and salt. Industrial gochujang is fermented following inoculation with Aspergillus oryzae and Bacillus subtilis as starter microorganisms. In contrast, a wide variety of natural fungi and bacteria are used in fermentation and aging of artisanal gochujang, the aging period of which is longer than 6 months. We monitored ochratoxin A (OTA) contamination of red pepper and gochujang available in the Korean retail market and explored the possibility that microorganisms in gochujang might degrade OTA present in contaminated red pepper during soybean fermentation and aging. We report here that OTA can be easily biotransformed serially to several products by B. subtilis (KTCT 1021) under the conditions of our experiments. The dynamic microbial activity in gochujang might contribute to the low occurrence of ochratoxin A in this product despite the use of highly contaminated pepper powder, one of the main ingredients of gochujang. At the same time, however, an inappropriate fermentation process and the long aging period are assumed to be sources of contamination. Studies to identify critical control points and to prevent fungal spoilage by the development of high quality starters should be followed up to enable the artisan to produce OTAfree gochujang.
Improved Side-Channel Attack on DES with the First Four Rounds Masked
Jongsung Kim,홍석희,한동국,이상진 한국전자통신연구원 2009 ETRI Journal Vol.31 No.5
This letter describes an improved side-channel attack on DES with the first four rounds masked. Our improvement is based on truncated differentials and power traces which provide knowledge of Hamming weights for the intermediate data computed during the enciphering of plaintexts. Our results support the claim that masking several outer rounds rather than all rounds is not sufficient for the ciphers to be resistant to side-channel attacks.
A NOTE ON EULERIAN POLYNOMIALS OF HIGHER ORDER
Jongsung Choi 충청수학회 2013 충청수학회지 Vol.26 No.1
In this paper we derive some identities on Eulerian polynomials of higher order from non-linear ordinary di??erential equations. We show that the generating functions of Eulerian poly-nomials are solutions of our non-linear ordinary di??erential equa-tions.