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이후승(Hu-Seung Lee),배한성(Han-Sung Bae),김성범(Seongbeom Kim),주윤재(Yun-Jae Joo),김정오(Jung-Oh Kim),노지환(Ji-Hwan Noh) 한국생산제조학회 2016 한국생산제조학회지 Vol.25 No.5
Recently, wireless charging systems have expanded their applications from household electrical appliances to outdoor activity devices. In wireless charging systems, solar cells have versatile advantages, such as abundant raw materials within the earth, reasonable prices of products, and highest power conversion efficiency. In this study, the photovoltaic effect between a silicon solar cell and a photon of infrared wavelength was simulated using a Shockley diode equation. A solar cell power charging system was then set up to: 1) clarify mechanisms of the charging interaction based on the photovoltaic effect with a laser source, and 2) verify interdependency of the parameters: laser settings and geometrical position between a solar cell and the laser. As was observed, the solar cell generates more power when the photon was irradiated uniformly, intensively, and vertically on the surface of the solar cell.
이후승(Hu Seung Lee) 대한기계학회 2018 大韓機械學會論文集B Vol.42 No.4
최근 3D프린터를 이용한 다양한 제품이 큰 주목을 받으면서 관련 기술에 대한 연구가 활발하게 이루어지고 있다. 그 연구들 중 공정과 장비에 대한 연구가 활발한 것에 비해 재료에 대한 연구는 현재 상대적으로 미비한 것이 현실이다. 이를 극복하고자, 본 논문에서는 그 재료의 형태에 따른 분광특성을 분석하여 광에너지를 이용한 소결에 기반이 되도록 분석하였다. 그 결과, 콜로이드의 형태에 따라서 특정파장의 흡수율이 커지거나 줄어드는 현상과 더불어, 특정 파장을 중심으로 흡수율의 폭이 넓어지거나 흡수파장이 이동하는 현상을 발견하였다. 이를 이용하여 제조를 원하는 패턴의 형상에 따른 광에너지의 파장선정과 재료의 선정에 이용할 수 있을 것으로 판단된다. Recently, various products using 3D printers have received great attention, and research on related technologies is being actively carried out. Among these studies, research on process and equipment is active, but the research on materials is relatively scarce currently. To overcome this, we analyze the spectral characteristics according to the shape of the material, and analyze them to apply the data for sintering using light energy. As a result, the absorption rate of a specific wavelength increases or decreases depending on the shape of the nanoparticles, and a phenomenon is noted wherein the absorption rate increases, or the absorption wavelength shifts around a specific wavelength. This can be used for the selection of the wavelength of the light energy and the selection of the material according to the shape of the pattern desired to be manufactured.
초음파 원용 레이저 가공에서 재료의 열적 물성이 표면상태에 미치는 영향에 관한 연구
이후승(Hu Seung Lee),김건우(Gun Woo Kim),박종은(Jong Eun Park),양민양(Min Yang Yang),조성학(Sung Hak Cho),박종권(Jong Kweon Park) 대한기계학회 2015 大韓機械學會論文集A Vol.39 No.8
레이저 가공 공정은 마스크 없이 전극을 가공할 수 있다는 장점 때문에 우수한 공정들 중의 하나로 제안되고 있다. 본 논문에서는, 서로 다른 열적 물성을 가지는 금속들에 레이저 가공을 수행하였다. 이 금속들은 서로 다른 표면형상, 열영향부, 그리고 재융착층을 나타내었고 이는 열전도도, 끓는점, 그리고 열확산계수에 의존하였다. 또한 재융착층을 제거하기 위하여 초음파 원용 레이저 가공을 적용, 높은 열확산계수를 가지는 재료에서 그 초음파 가진에 의한 표면 품질의 향상을 발견하였다. The laser machining process has been proposed as an advanced process for the selective fabrication of electrodes without a mask. In this study, we adapt laser machining to metals that have different thermal properties. Based on the results, the metals exhibit a different surface morphology, heat-affected zone (HAZ), and a recast layer around the machined surface according to their thermal conductivity, boiling point, and thermal diffusivity. Then, we apply ultrasonic-assisted laser machining to remove the recast layer. The ultrasonic-assisted laser machining exhibits a better surface quality in metals with higher diffusivity than those having lower diffusivity.
저가형 다이오드 레이저 모듈의 제작 및 이를 이용한 전자소자 제조
이후승(Hu Seung Lee),김재민(Jae Min Kim),강봉철(Bong Chul Kang),이주형(Joo Hyung Lee),나준희(Jun Hee Na) 한국생산제조학회 2019 한국생산제조학회지 Vol.28 No.5
Recently, various kinds of lasers have been developed in response to the trend of expanding the application field of the laser industry. Despite the widespread application of lasers, their high cost limit their performance in many applications . To overcome this limitation, low-cost diode lasers have been actively studied. In this paper, a low-cost laser was developed for the production of printed electronic patterns as a part of the development of low-cost lasers. As a result, high-quality lasers were developed capable of producing printed electronic patterns. It was also possible to achieve properties similar to that of a conventional low-cost infrared fiber laser.
나노스템프 구동용 중공형 압전액추에이터 기본특성에 관한 연구
박중호(Jung-Ho Park),이후승(Hu-Seung Lee),이재종(Jae-Jong Lee),윤소남(So-Nam Yun),함영복(Young-Bog Ham),장성철(Sung-Cheol Jang) 대한기계학회 2011 大韓機械學會論文集A Vol.35 No.9
최근, MEMS/NEMS 기술을 이용하여 기능성 나노 구조물을 제작하기 위한 공정기술 중에, 마스터 스템프에 형성된 나노패턴을 웨이퍼 등에 복제할 수 있는 나노임프린트 리소그래피 기술이 활발히 연구되고 있다. 본 연구에서는 기존 멀티헤드방식 나노임프린팅 장비에서 사용되던 전동모터를 대신하여 플렉셔 메커니즘과 결합된 나노스템프를 구동하기 위한 사각 형상의 중공형 압전액추에이터를 설계, 제작하였으며, 제조공정이 다른 각각의 시제품의 변위, 발생력 및 응답특성에 관한 검토를 수행한다. 또한, 압전 액추에이터의 변위제어에 대한 제어수법을 간단히 소개하였으며, 제작한 프로토타입의 PI제어기에 의한 변위 제어결과를 소개한다. Nanoimprint lithography has been actively investigated. This method can replicate a nanopatterned master stamp onto a thin polymer film on a silicon substrate and so on. In this study, a square-shaped hollow piezoelectric actuator is presented, which is newly developed. This actuator is used for driving a nanoscale stamp in nanoimprint lithography instead of a conventional electric motor. The fabricated prototype actuator has 95 layers and side lengths of 23 ㎜ and 18 ㎜ for the outer and inner squares, respectively. By adopting a novel process instead of the conventional forming process for fabricating a one-layer actuator, the one-layer is composed of four rectangular segments produced by sawing a ceramic film with a thickness of 0.3 ㎜. The basic characteristics on displacement and generation force of the fabricated prototype actuator are experimentally investigated. Furthermore, the displacement characteristics obtained by using a PI controller are tested and discussed.
박중호(Jung-Ho Park),이후승(Hu-Seung Lee),이재종(Jae-Jong Lee),윤소남(So-Nam Yun),함영복(Young-Bog Ham),장성철(Sung-Cheol Jang) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Nanoimprint lithography has been actively investigated, which can replicate nano-patterned master stamp into thin polymer film on silicon substrate and so on. In this study, a square-shaped hollow piezoelectric actuator is presented, which is newly devised for driving nanoscale stamp instead of conventional electric motor in nanoimprint lithography. The 95-layered prototype actuator is fabricated with the side lengths of 23㎜ and 18㎜ for outer and inner squares. By applying a novel process instead of conventional forming process to fabricate one layer actuator, the one layer is composed of 4 rectangular segments produced by sawing a ceramic film with the thickness of 0.3㎜. Basic characteristics on displacement and generation force of the fabricated prototype are experimentally investigated. Furthermore, displacement characteristics using PI controller are also tested and discussed.
박정우(Jeong Woo Park),한성민(Sung-Min Han),이후승(Hu Seung Lee),윤소남(So-Nam Yun) 유공압건설기계학회 2021 드라이브·컨트롤 Vol.18 No.3
A rear axle steering (RAS) system is attached to the rear of medium and large commercial vehicles that transport large cargo. The existing RAS systems are driven by electro-hydraulic actuator (EHA), and most commercialized EHAs consist of electric motors, hydraulic pumps, relief valves, prefill valves and cylinders. The prefill valve required for such EHAs is a type of check valve with extremely low cracking pressure that should not allow RAS to have noise or vibration, and the prefill valve prevents system negative pressure as well as unstable operation. Most papers on this topic rely on experiments to predict valve performance, and theoretically detailed modeling of valves or pipelines is performed, but it is very rare to evaluate hydraulic vibration characteristics by analysing everything from hydraulic pumps to valves comprehensively. In this study, we proposed an experimental circuit that can predict the performance of the prefill valve. The study also analysed the pressure-flow pulsation that is transmitted to the valve through the pipeline, and how the transmitted pressure-flow pulsation affects the valve vibration.