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전상구(Sang-Gu Jeon),장훈식(Hoon-Sik Jang),권오헌(Oh-Heon Kwon),남승훈(Seung Hoon Nahm) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.2
다양한 분야에 활용이 가능한 나노소자의 개발과 나노소자의 수명 및 신뢰성을 결정하기 위해서 나노구조체의 역학물성 측정은 중요하다. 본 연구에서는 다중벽탄소나노튜브(MWCNT)와 산화아연나노막대(ZnO nanorod)의 인장시험을 전자주사현미경(SEM) 내부에서 수행하였다. 챔버내부에 구축된 나노조작기 앞에 힘센서가 장착되었고, 나노조작기는 조이스틱과 컴퓨터로 제어 가능하도록 설계되었다. 반으로 자른 투과전자현미경(TEM)그리드 위에 분산된 나노구조체는 전자주사를 통하여 힘센서와 고정된 후 인장시험이 수행되었다. 인장시험 후 TEM과 SEM을 통하여 파단면을 측정하였고 MWCNT와 ZnO nanorod의 탄성계수는 0.98TPa, 55.85㎬로 각각 측정되었다. It is important to measure the mechanical properties of nanostructures because they are required to determine the lifetime and reliability of nanodevices developed for various fields. In this study, tensile tests for a multi-walled carbon nanotube (MWCNT) and a ZnO nanorod were performed in a scanning electron microscope (SEM). The force sensor was a cantilever type and was mounted in front of a nanomanipulator placed in the chamber. The nanomanipulator was controlled using a joystick and personal computer. The nanostructures dispersed on the cut area of a transmission electron microscope (TEM) grid were gripped with the force sensor by exposing an electron beam in the SEM; the tensile tests were the performed. The in situ tensile loads of the nanostructure were obtained. After the tensile test, the cross-sectional areas of the nanostructures were observed by TEM and SEM. Based on the TEM and SEM results, the elastic modulus of the MWCNT and ZnO nanorod were calculated to be 0.98 TPa and 55.85 ㎬, respectively.
전상백 ( Sang Back Jeon ),김평중 ( Pyoung Joong Kim ),김상수 ( Sang Su Kim ),주재식 ( Jae Sik Ju ),이용화 ( Young Hwa Lee ),장대수 ( Dae Soo Chang ),이정의 ( Jung Uie Lee ),박승윤 ( Seoung Yun Park ) 한국환경분석학회 2012 환경분석과 독성보건 Vol.15 No.3
We measured various geochemical parameters including texture, chemical oxygen demand (COD), ignition loss (IL), acid volatile sulfide (AVS), nonmetallics, alkali metals, alkaline earth metals, transition elements and heavy metals in order to determine the characteristics of spatial distribution in the surface sediments collected from 19 stations in the Deukryang Bay. It was observed that chemical oxygen demand (COD) and acid volatile sulfide in most stations were below the criteria proposed by Japan Fisheries Resource Conservation Association (JFRCA) to evaluate the pollution status of marine sediment. The pollution level was estimated by Enrichment factor (Ef) and Index of geoaccumulation (Igeo). For elements, the Enrichment factors (Ef) were smaller than 1 except for arsenic (As) which had highest Ef value of 1.72 and the Index of geoaccumulation (Igeo) for nonmetallic and metallic elements ranged between 1 and 2, indicating that the pollution levels by these elements were not serious. However, for the sustainability of the Deukryang Bay, continous monitoring should be necessary for with these harmful elements.
RFID 기반 정보시스템을 위한 보안감리 점검항목 연구
전상덕(Sang-Duk Jeon),임지영(Ji-Young Lim),이기영(Ki-Young Lee),한기준(Ki-Joon Han) 한국IT서비스학회 2012 한국IT서비스학회지 Vol.11 No.4
The core infra-technology in the ubiquitous era, RFID which has taken action from the public institution with the pilot projects as well as the practical projects is gradually extending its spectrum to the private enterprises. Along with its expansion, the audit required on the RFID-based information system is also growing in the industry, Especially, since RFID-based information systems, especially compared to other information systems, are likely to be exposed to many threats, the security audit for them is being emphasized. This paper suggests security audit checking items for the RFID-based information system, which can be used to perform the efficient security audit. The security audit checking items consist of eight basic checking items, each of which consists of detailed review items and can be applied for each building steps of the system(analysis, design, implementation, testing, and development). Finally, this paper confirmed the efficiency of the security audit checking items proposed in this paper through survey by the experienced auditors and analysis of practical audit cases.