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신용창(Yong Chang Shin),윤헌준(Heonjun Yoon),윤병동(Byeng D. Youn) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
Metamaterial-based energy harvesting (MBEH) has been recently proposed as a breakthrough technology to drastically enhance energy conversion efficiency. The bandgap, one of the property of the metamaterial can be used to focus mechanical wave on energy conversion device for highly dense energy harvesting. Even though many investigations of the MBEH have been reported, however, only a few research has considered the wave cancellation in the metamaterial design. In this study, therefore, we propose a new phononic crystal design configured with quarter-wave stack (QWS) unitcells to avoid wave cancellation. In the modeling thrust, the multiphysics finite element models are developed to analyze dispersion and electroelastic transduction of the energy conversion device. To verify the proposed QWS design, we build a beamlike shape phononic crystal and investigate the energy harvesting performance when constructive and destructive interferences occur. Finally, the energy harvesting performance of the proposed design is compared with non-QWS design which have the same impedance and the bandgap at the target frequency.
윤신용(Shin-Yong Youn) 대한전기학회 2016 전기학회논문지 P Vol.65 No.3
This study developed the conductivity pattern of solid surface using laser direct pattern and compound polymer material technology. For development direct patterning system of solid surface, we used the laser power stabilizer, the dynamic focusing, 3D scanner S/W and the auto aligning techniques. Also For conductivity pattern, we are developed compound polymer material with additive by electro-less plating. These technologies are already used commercially. However operation and control integrated system for direct patterning of solid surface are not yet developed. The objective of this paper is to introduce the laser direct structuring for simple process improvement instead complex PCB process, and develop the operating stability and integration system. Also we implemented new application of laser direct structuring through sample manufacture.
산업용 잉크젯 압전프린트 헤드의 특성해석 및 잉크 망점제어에 의한 PCB 전기회로패턴 공정개선
윤신용(Shin-Yong Youn) 대한전기학회 2016 전기학회논문지 P Vol.65 No.1
This paper was analyzed the characteristics of piezoelectric inkjet print head using finite element method(FEM). It showed the bending node driving of piezoelectric and relation theory principle consider piezoelectric material characteristics and ink characteristics. From such result we were had the piezoelectric head design and manufacture. It got a this head characteristics through experiment, we confirmed that proper voltage control is possible to through ink drop control experiment of piezoelectric print head. This paper was obtained the suitable ink jetting characteristics that manufacture the control circuit and piezoelectric inkjet print head. This practice product was applied to improvement of PCB electric circuit pattern by etching resist ink that PCB manufactured to complex process over traditional 6 stages can be simpled to 1 stage by inkjet printing technology.
디지털 텍스타일 프린터 전기설비의 노이즈 저감에 관한 연구
윤신용(Shin-Yong Youn) 대한전기학회 2020 전기학회논문지 P Vol.69 No.1
This paper is noise reduction for electrical facilities of digital textile printer. Control panel system for inkjet head printing are composed to power supply part, motor control part, head control and communication board part, sensors and cable-bare harness. A diverse noises are caused from electrical facilities in such instances. It are effected to communication signal error of control board by conductivity noise, inducement noise and electromagnetic wave noise. Accordingly, this paper was reduce to noise by method that were bypass of integration ground wire to booth-bar, separate of power cable and communication cable, cable shield ground wire, attach with magnetic core of motor cable. These stable control system were acquired the printing result of spotless clean color image.
LED를 이용한 플렉시블 면 조명의 신 제조 공정기술 개발
윤신용(Shin-Yong Youn) 대한전기학회 2016 전기학회논문지 P Vol.65 No.2
This paper developed new manufacture process technology of slim type flexible flat lighting product used lower power white LED. Flexible flat lighting is applied to letter sign lighting, traffic lighting, interior wall lighting, flat lighting, aquarium back lighting, wreath light etc. Main manufacture process technology were developed drawing software for electronics circuit, inkjet electronic circuit pattern and inkjet white ink coating. For pattern printing it was utilized for piezoelectonic inkjet head printing technology. Also high vacuum pressure laminating technology was waterproofing for LED flat lighting protection. Hence, form process technology we were manufactured for flexible flat lighting product of the power 12 W, input voltage 48 V and plane size 480×480 ㎜. It acquired a these validity from experiment results.
고속 텍스타일 전사 프린터의 잉크 토출 안정 온도 제어
윤신용(Shin-Yong Youn),안성만(Seong-Man An),남영빈(Young-Been Nam) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
최근 섬유(의류) 세계 시장 및 기술동향은 기존 날염에서 친환경 디지털 날염으로 성장 확대 되고 있는 추세이다. 섬유 원단에 다양한 색상 이미지를 인쇄하는 것을 날염이라고 하며 여기에는 아날로그 날염과 디지털 날염으로 분류된다. 섬유원단에 날염 시 기존 아날로그 스크린 도판의 오폐수로 인하여 폐수처리 공단에서만 작업이 가능하였지만 디지털 텍스타일 프린터는 잉크젯 헤드제어 기술을 이용하여 섬유 및 전사지에 원하는 다양한 이미지를 출력하므로 공단외 지역에서 작업이 가능하다. 디지털 날염에 있어서 압전 헤드에 의한 잉크 토출의 안정성은 중요한 부분이며 이에 영향을 미치는 것이 헤드의 잉크 관로 솔밸브의 온도 상승에 의한 잉크기화로 잉크 뭉침에 의한 헤드 노즐 불안정이 발생한다. 따라서 본 연구에서는 산업용 텍스타일 프린터의 발열을 억제하도록 전압조정 회로를 구현하여 적합한 온도제어에 의한 잉크 토출 안정화를 확인하였다.