• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2002년도 하계학술대회 논문집
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• pp.18-21
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• 2002

As the mask design rules get smaller, the probability of the process failure becomes higher due to the narrow overlay margin between the contact and metal interconnect layers. To obtain the minimum process margin, a tabbing and cutting method is applied with the rule based optical proximity correction to the metal layer, so that the protection to bridge problems caused by the insufficient space margin between the metal layers can be accomplished. The side-lobe phenomenon from the attenuated phase shift mask with the tight design nile is analyzed through the aerial image simulation for test patterns with variation of the process parameters such as numerical aperture, transmission rate, and partial coherence. The corrected patterns are finally generated by the rules extracted from the side-lobe simulation.

• 한국전기전자재료학회논문지
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• 제16권12호
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• pp.1097-1102
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• 2003

In this paper, we used only PR as etching mask, while it used usually Cr/AU as etching mask, and in order to fabricate a photosensor has the increased sensitivity, we investigated on the sensitivity of general type and p-i-n type diode. we designed microchannel size width max 10um, min 5um depth max 10um, reservoir size max 100um, min 2mm. Fabrication of microfluidic devices in glass substrate by glass wet etching methods and glass to glass fusion bonding. The p-i-n diode has higher sensitivity than photodiode, Considering these results, we fabricated p-i-n diodes on the high resistive(4㏀$.$cm) wafer into rectangle and finger pattern and compared internal resistance of each pattern. The internal resistance of pin diode can be decreased by the application of finger pattern has parallel resistance structure from 571Ω to 393Ω.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2010년도 하계학술대회 논문집
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• pp.62-62
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• 2010

Photonic quasi-crystals(PQCs) have been fabricated by a multiple-exposure nanosphere lithography (MENSL) method using the self-assembled nanospheres as lens-mask patterns. The multiple-exposing source is collimated laser beam and rotation, tilting system. The arrays of the PQCs exhibited variable lattice structures and shape the control of ratating angle ($\theta$), tilting angle ($\gamma$) and the exposure conditions. The used nanosphere size is upto the $1\;{\mu}m$. Images of prepared 2D PQCs were observed by SEM. We believe that the MENSL method is a suitable useful tool to realize the PQCs arrays of large area.

• 한국마이크로전자및패키징학회:학술대회논문집
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• 한국마이크로전자및패키징학회 2002년도 International Symposium
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• pp.79-94
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• 2002

Root cause -Thermal expansion coefficient mismatch -Tape warpage -Initial die crack (die roughness) Guideline for failure prevention -Optimized tape/Substrate design for minimizing the warpage -Fine surface of die backside Root cause -Thermal expansion coefficient mismatch - Repetitive bending of a signal trace during TC cycle - Solder mask damage Guideline for failure prevention - Increase of trace width - Don't make signal trace passing the die edge - Proper material selection with thick substrate core Root cause -Thermal expansion coefficient mismatch -Creep deformation of solder joint(shear/normal) -Material degradation Guideline for failure Prevention -Increase of solder ball size -Proper selection of the PCB/Substrate thickness -Optimal design of the ball array -Solder mask opening type : NSMD -In some case, LGA type is better

• 융합정보논문지
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• 제9권6호
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• pp.227-232
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• 2019

본 연구는 메이크업의 창의적 표현 영역으로서 주목받고 있는 아트 마스크에 네오 팝 아트를 접목하여 새로운 디자인 방향을 제안하는데 있다. 이론적 고찰을 통해 네오 팝의 특성을 분석한 후, 일본의 팝 아티스트인 무라카미 다카시의 작품을 모티브로 각 특성에 따라 총 4작품의 아트 마스크를 제작하였다. 연구 결과로는 첫째, 네오팝은 아트 마스크의 소재로 활용하기에 충분했다. 둘째, 네오 팝의 특성을 적용한 아트 마스크의 새로운 디자인을 제안할 수 있었다. 셋째, 미술과 메이크업의 융합을 통해 다양한 분야 간의 융합 가능성을 알 수 있었다. 향후 다양한 분야와의 융합을 통한 아트 마스크의 연구가 활발히 이루어지기를 바라며 본 연구가 아트 마스크 디자인 개발의 기초자료로 활용되기를 바란다.

• Journal of Preventive Medicine and Public Health
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• 제54권1호
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• pp.31-36
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• 2021

Objectives: Non-traditional materials are used for mask construction to address personal protective equipment shortages during the coronavirus disease 2019 (COVID-19) pandemic. Reusable masks made from surgical sterilization wrap represent such an innovative approach with social media frequently referring to them as "N95 alternatives." This material was tested for particle filtration efficiency and breathability to clarify what role they might have in infection prevention and control. Methods: A heavyweight, double layer sterilization wrap was tested when new and after 2, 4, 6, and 10 autoclave sterilizing cycles and compared with an approved N95 respirator and a surgical mask via testing procedures using a sodium chloride aerosol for N95 efficiency testing similar to 42 CFR 84.181. Pressure testing to indicate breathability was also conducted. Results: The particle filtration efficiency for the sterilization wrap ranged between 58% to 66%, with similar performance when new and after sterilizing cycles. The N95 respirator and surgical mask performed at 95% and 68% respectively. Pressure drops for the sterilization wrap, N95 and surgical mask were 10.4 mmH2O, 5.9 mmH2O, and 5.1 mmH2O, respectively, well below the National Institute for Occupational Safety and Health limits of 35 mmH2O during initial inhalation and 25 mmH2O during initial exhalation. Conclusions: The sterilization wrap's particle filtration efficiency is much lower than a N95 respirator, but falls within the range of a surgical mask, with acceptable breathability. Performance testing of non-traditional mask materials is crucial to determine potential protection efficacy and for correcting misinterpretation propagated through popular media.

• 한국재료학회:학술대회논문집
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• 한국재료학회 2002년도 춘계 학술발표강연 및 논문개요집
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• pp.157-157
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• 2002

• 한국재료학회:학술대회논문집
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• 한국재료학회 1999년도 춘계학술발표강연 및 눈문개요집
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• pp.35-35
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• 1999

• 한국재료학회:학술대회논문집
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• 한국재료학회 1998년도 추계학술발표강연 및 논문개요집
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• pp.11-11
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• 1998

• 한국산학기술학회논문지
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• 제21권8호
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• pp.36-43
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• 2020

항산화력이 있는 비자, 초두구의 추출물에 대해 향장소재로서의 특성을 시험하고 마스크 팩 제형에 적용하여 향장특성을 연구하였다. 비자, 초두구의 열수 및 에탄올 추출물의 DPPH 항산화 시험으로 에탄올 추출물이 열수추출물에 비해 우수한 항산화 효능이 있는 것을 확인하였다. 비자와 초두구의 마스크 팩 원료로서 최적 혼합비율은 DPPH 항산화 시험결과 3:7임을 확인하였다. 세포독성 시험결과 무처리군 대비 0.5 ug/mL에서 103.30%, 1 ug/mL에서 104.25%, 5 ug/mL에서 102.56%, 10 ug/mL에서 99.17%의 세포생존율을 각각 나타내어 세포생존율이 양호하였다. 비자, 초두구 추출물을 사용한 시트마스크 팩 제형에서의 패치테스트 결과, 피부 첩포 일차자극 인체적용시험에서 피부 자극 지수 0.02로 비자극 제품으로 판정되었다. 피부 보습성 평가에서는 시료 적응 전에 비하여 시료적응 후 19.178%의 유의한 증가율을 보였다. 시트마스크 팩 제형에서 경시변화 평가는 저온(4℃), 상온(25℃), 고온(45℃)에서 12주간 점도 및 pH변화가 없는 제형안정성을 확인하였다.