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이재설(Jaeseol Lee),고현우(Hyun-Woo Goh) 한국산업경영시스템학회 2008 한국산업경영시스템학회지 Vol.31 No.3
Mail centers play an important role such as sorting and transporting postal items in the process of postal logistics. Therefore, there is need of efficiency measurement of the facilities to reduce the inefficiency of factors. But only few attempts have so far been made at measuring the efficiency of postal logistics hubs. The purpose of this paper is to make a reasonable suggestion for the improvement of inefficient mail centers. So this study found the efficient mail centers and inefficient mail centers using data envelopment analysis(DEA) and compared inputs and outputs of the former with those of the latter.
기능성 탐침이 통합된 하이드로젤 원자현미경 캔틸레버의 제작
이재설(Jaeseol Lee),이정철(Jungchul Lee) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
In this paper, we fabricated atomic force microscope (AFM) cantilevers with a hydrogel-poly(ethylene glycol) diacrylate (PEGDA)- and demonstrated integration of functional tips without changing the tip shape by embedding magnetic nanoparticles, plasmonic gold nanorods, and fluorescent quantum dots inside tips when the PEGDA was crosslinked within a silicone rubber mold. Fabricated hydrogel AFM cantilevers were examined with optical, fluorescent and scanning electron microscopes. The developed hydrogel AFM cantilevers would be useful for functional imaging for soft and delicate samples such as cells.
산소 플라즈마 식각을 이용한 20 ㎚ 이하 탐침 곡률반경 하이드로젤 켄틸레버 제작 및 고분해능 이미징
송정기(Jungki Song),이재설(Jaeseol Lee),이정철(Jungchul Lee) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
This paper reports fabrication of sub-20 ㎚ hydrogel microcantilevers based on replica molding and O2 plasma ashing and their comparable imaging capability with silicon counterparts. First, hydrogel microcantilevers were fabricated with poly(ethylene glycol) diacrylate (PEGDA) using a polydimethylsiloxane (PDMS) cantilever mold via UV crosslinking along with capillary force induced filling into the mold. Second, Pyramid mold was integrated to the free-end of the hydrogel microcantilevers. PEGDA was dispensed into the pyramid mold, bi-axially compressed for 10~20% strain, aligned with the tipless hydrogel microcantilever, and UV cured. Third, tip radius of hydrogel microcantilevers was improved to be sub-20 ㎚ by O2 plasma ashing. Tip radius decrease depending on initial tip radius was characterized by varying the time for plasma ashing. Finally, topography of anodized aluminum oxide (AAO) (width 50 ㎛, depth 2 ㎛) was imaged in non-contact (NC) mode. Sharp hydrogel tip is shown to be free of degradation while imaging in NC mode.