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Design of Urban Transport Management System Based on ntegrated Wireless LAN Technologies
우석(Seok Woo),김은찬(Eunchan Kim),오경석(Kyoungseok Oh),김기선(Kiseon Kim) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
Rapid developments of industry and economics have made a metropolis which demands an effective urban transport management system (UTMS). Specially, this paper considers a subway surveillance system based on integrated wireless LAN technologies for public safety. Since a current subway platform security entirely relies on conventional closed circuit television camera (CCTV) or human operators, subway train drivers cannot detect platform states and cope with abnormal situations or accidents immediately. However, through the IP cameras and some wireless routers, high Quality images of the platform conditions can be directly delivered to the train drivers and other station employees in advance of train entering the platform. In this paper, several design issues and problems are discussed when building up the subway management system. Further, we illustrate a system model with the system requirements in real parametric values in order to draw concrete system designs and to realize a practical implementation of the future UTMS.
수중대향충돌 방식을 이용한 숙신산 무수물 개질 β-키틴 나노섬유의 제조
진정호,Lee Jongmin,Seo Wonjeong,Song Myeong-Oh,Oh Eunchan 한국키틴키토산학회 2022 한국키틴키토산학회지 Vol.27 No.2
In this study, we report on the production of succinylated β-chitin nanofibers (ChNF) via aqueous counter collision (ACC) method. Succinic anhydride (SA) mediated chemical modification is known as an effective nanofibrillation strategy for typical natural polysaccharides through the surface carboxylation, which has attracted attention due to its relatively mild characterisitics, such as non-toxicity. Using the combined physico-chemical treatment of SA and ACC, the succinylated β-chitin nanofiber (β-SChNF) was successfully prepared as a uniform hydrocolloidal suspension. The SEM and AFM analysis showed that the diameter of the SChNF ranged from 14 nm to 30 nm. The XRD and FT-IR analysis were used to confirm that the original crystal and chemical structure of chitin were maintained even after the physico-chemical nanofibrillation. We also fabricated a transparent film from the SChNF which showed a typical diameter-dependent optical transmittance; that is, the higher the number of ACC pass (i.e., smaller diameter of SChNF), the greater the optical transparency (80%). Our results show that SA chemical pre-treatment of β-chitin can boost successful nanofibrillation.