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유한요소법을 이용한 유연소자용 Au 나노구조체의 내구성 평가
남병현(Byung Hyun Nam),윤홍석(Hongseok Youn),최진일(Jinnil Choi) 한국생산제조학회 2021 한국생산제조학회지 Vol.30 No.1
In this study, the levels of durability of nanostructures for flexible devices are explored based on tensile force, bending moment, and torsion. First, for application to optical devices, aluminium nanostructures are fabricated using laser interference lithography. The optical characteristics of the fabricated nanopatterns are investigated, and the structure with the highest light transmittance is selected for durability analysis. A structural analysis model using the finite element method is then developed and its reliability is validated through a comparison with the experimental data for both polyethylene terephthalate and Au thin films. Finally, the different levels of durability of the nanostructures are investigated for application based on tensile force, bending moment, and torsion. The structural weakness of each nanostructure is explored and the durability characteristics are highlighted.
IOT(Internet of Things)를 활용한 싱글 스크루 공기압축기 에어엔드 스마트 모니터링 시스템
박철민(Cheolmin Park),오승준(Seungjun oh),강태형(Taehyung Kang),박진성(Jinseong Park),윤홍석(Hongseok Youn) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
In the conventional air compressor, in particular, rotational elements such as bearing, housing and structural members can be worn out or damaged with respect to the operating time and excessive stress. However, it is hard to estimate the expected wear amount or evaluate the exact amount of damage during the operation by the conventional analytic approaches using the mathematical models. To monitor the interested parts in the air compressor air-end, various sensors are efficient to evaluate the conditions of the mechanical part by using such as the deformation sensor and vibration sensor etc. Moreover, the wireless communication technique enables transmit various sensor signals data to the operator regardless of operator’s locations on the internet. In this paper, we demonstrate the smart monitoring system for single-screw type air compressor via IOT(internet of things) technique.