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Im, A-Rang,Kim, Jee Young,Kim, Hyun-Seok,Cho, Seonho,Park, Youmie,Kim, Yeong Shik IOP Pub 2013 Nanotechnology Vol.24 No.39
<P>For topical applications in wound healing, silver nanoparticles (AgNPs) have attracted much attention as antibacterial agents. Herein, we describe a green-synthetic route for the production of biocompatible and crystalline AgNPs using two glycosaminoglycans, chondroitin sulfate (CS) and acharan sulfate (AS), as reducing agents. The synthetic approach avoids the use of toxic chemicals, and the yield of AgNPs formation is found to be 98.1% and 91.1% for the chondroitin sulfate-reduced silver nanoparticles (CS-AgNPs) and the acharan sulfate-reduced silver nanoparticles (AS-AgNPs), respectively. Nanoparticles with mostly spherical and amorphous shapes were observed, with an average diameter of 6.16 ± 2.26 nm for CS-AgNPs and 5.79 ± 3.10 nm for AS-AgNPs. Images of the CS-AgNPs obtained from atomic force microscopy revealed the self-assembled structure of CS was similar to a densely packed woven mat with AgNPs sprinkled on the CS. These nanoparticles were stable under cell culture conditions without any noticeable aggregation. An approximately 128-fold enhancement of the antibacterial activities of the AgNPs was observed against <I>Enterobacter cloacae</I> and <I>Escherichia coli </I> when compared to CS and AS alone. In addition, an <I>in vivo</I> animal model of wound healing activity was tested using mice that were subjected to deep incision wounds. In comparison to the controls, the ointments containing CS-AgNPs and AS-AgNPs stimulated wound closure under histological examination and accelerated the deposition of granulation tissue and collagen in the wound area. The wound healing activity of the ointments containing CS-AgNPs and AS-AgNPs are comparable to that of a commercial formulation of silver sulfadiazine even though the newly prepared ointments contain a lower silver concentration. Therefore, the newly prepared AgNPs demonstrate potential for use as an attractive biocompatible nanocomposite for topical applications in the treatment of wounds.</P>
KCDSA를 이용한 분할가능 및 익명성 제어를 갖는 전자화폐 시스템
장석철(Seok-Cheol Jang),이임영(Im-Yeong Lee) 한국정보과학회 2001 한국정보과학회 학술발표논문집 Vol.28 No.1A
전자상거래가 활발하게 이루어짐으로서 지불수단에 대한 관심이 증가되고 있다. 또한 지불 시스템에 대한 수많은 연구가 진행되고 있다. 특히 사용자의 사생활을 보호하기 위해 익명성을 제공하는 시스템과 이로 인해 발생하는 문제점들을 해결하기 위해 익명성 제어에 관련된 전자화폐 시스템이 연구되어 있다. 따라서 본 논문에서는 국내 전자서명 표준인 KCDSA를 기반으로 하여 익명성을 유지하며 실물화폐에서 갖지 못한 효율적이고 편리한 분할성 기능과 필요시 신뢰기관의 도움으로 익명성을 제어할 수 있는 새로운 전자화폐 시스템을 제안한다.