• 센서학회지
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• 제28권5호
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• pp.318-322
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• 2019

In shooting training, an impact point identification system that uses the impact wave of the bullet to check the impact point in the target plate has been recently used. Acoustic sensors used in these systems must be able to detect shock waves of high sound pressure levels and be both waterproof and dustproof for rainy weather and dusty environments, respectively. In this study, membranes with excellent waterproof, dustproof, and sound transmitting characteristics were selected through a characteristics test; a protection cap was installed to install the selected materials. After coupling the produced protection cap to the acoustic sensor housing, the sensitivity and phase characteristics of the acoustic sensor were checked. Through the waterproof and dustproof test, the performances of its sensitivity and phase characteristics were confirmed. Finally, the normal shockwave of a 5.56 mm diameter bullet was measured using a shockwave detection signal collecting plate equipped with a prototype of the acoustic sensor at a 100 m firing range.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2011년도 춘계학술대회 논문집
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• pp.1227-1228
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• 2011

• 한국축산시설환경학회지
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• 제6권3호
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• pp.133-140
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• 2000

This study was carried out to determine a suitable mixing rate to utilize the PDF as a bedding materials at the pigpens and investigate the effect of substitute processed dustproof fly-ash(PDF) on the odor. In proportion to the increase of substitute rate of the PDF, the utilizable period was extended, and there was a little change of the moisture in the bedding materials. At all the treatment of PDF, there was the significant effect on the maggots and parasites but it didn\`t hinder in the biodegradation. According to highly mixing rate, PDF decreased in the noxious gas ($NH_3$ and $H_2$S) emission. In conclusion, the mixing rate of 30% or above this substituted level will increase replacement terms, and reduce the sawdust cost and the pollutions of breed pigs.

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 2007년도 학술발표회 논문집
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• pp.283-284
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• 2007

• 품질경영학회지
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• 제46권2호
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• pp.301-310
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• 2018

Purpose: The purpose of this study is to investigate the effect of work intensity on fit factor and affective quality of the dustproof Background: Among the victims who suffer pneumoconiosis due to the inhalation of toxic substances or the lack of oxygen during the work, the proportion of the victims is larger than the other causes. Wearing a respirator may prevent pneumoconiosis, but it can be hazardous to workers because of the leakage through filters, cartridges, exhaust valves, broken parts, and face-to-face contact. Despite leakage through the contact area between the mask and the face has various causes such as the wearer's activity, sweat accumulation, facial shape, etc., There is a lack of relevant research and regulation compared to developed countries that have already institutionalized the law 30 years ago and give the right to sell through a test Method: The work intensity was adjusted by walking or running at 6km/h and 11km/h on the treadmill, and tasks were defined with reference to the test procedure and the exercise sequence applied in the face leakage test of the dustproof mask. And fit factor was measured objectively using 'Respirator Fit Tester 8038' which measures fit factor calculated by dividing the number of dust present outside the mask by inside the mask. In addition, affective quality was classified by the ease of use, ease of breathing, and ease of wearing, and was measured using the 5-point likert scale questionnaire. Results: There was a significant difference in fit factor, ease of breathing, and wearing convenience according to work intensity and no significant difference in ease of use(${\alpha}=0.01$). And when the work intensity was high, fit factor, ease of breathing, and wearing convenience were all lower than when the work intensity was low. Conclusion: In Korea, it is necessary to consider consideration of the work intensity when testing the leakage rate of the face part for safety certification of the respiratory protective equipment, When developing a mask, it should be possible to maintain high adhesion even under intense, active situation and high temperature conditions by selecting materials, improving the wearing style, and expanding the adjustable range.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2004년도 추계학술대회 논문집
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• pp.1339-1343
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• 2004

This paper presents a development of the control algorithm and Pick & Placer. The Pick & Placer provides a powerful multi-task system that includes both graphical and remote interface. Users can easily set up sorting parameters and record important data including wafer number, data, and operator information. This System sets up a dustproof device and massively machined components to provide an extremely stable sorting environment. Precise resolution and accuracy result from using machine vision, a pneumatic slide drive and close -looped positioning.

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2001년도 춘계학술대회 발표논문집
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• pp.84-86
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• 2001

본 논문에서는 고성능 활성탄의 악취 및 유해가스 흡착효율과 멜트브로운(M/B)부직포의 여과성능에 의한 복합적인 고기능 방진특성을 갖는 활성탄 부착 M/B 국산화 여과재를 제조개발하였다. 고성능 활성탄은 고순도의 일반활성탄에 금속염, 유기물 등을 담지시켜 활성화시킨 활성탄이고, M/B여과재의 웹(web)제조조건은 M/B 방사기에서 방사온도 250℃, 방사속도 150m/sec, 고온공기온도 250℃ 그리고 DCD(die to collector distance) 20cm가 적합함을 알 수 있었다. 또한 M/B 여과재에 활성탄 부착은 열롤러시스템에 의한 열적결합방법을 이용하여 균일한 분포의 점접착결합구조를 갖도록 하였고, 개발된 복합기능 여과재가 방진마스크용 여과재로의 이용이 가능하다는 것을 분진포집효율, 투과율, 흡기저항 등 여과재 성능기준실험 결과를 통해 확인하였다.

• International Journal of Internet, Broadcasting and Communication
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• 제16권2호
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• pp.93-102
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• 2024

We introduce a novel outdoor linear LED luminaire enhanced with Gore-Tex filters, designed to overcome the challenges of moisture and thermal management in harsh environments. This luminaire integrates expanded polytetrafluoroethylene (ePTFE)-commercially known as Gore-Tex-achieving superior waterproofing and dustproof qualities while maintaining breathability to prevent internal condensation. The design process, from conceptualization through prototyping and testing, is detailed, highlighting the luminaire's improved durability and stability under varying conditions. Experimental results demonstrate that our design significantly extends the operational lifespan and reliability of outdoor LED lighting systems by mitigating thermal and moisture-related degradation. This study not only advances ePTFE's application in lighting technologies but also offers a scalable model for enhancing the performance of LED luminaires in outdoor settings.

• 한국결정성장학회지
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• 제30권6호
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• pp.264-270
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• 2020

사용자 중심의 서비스디자인 방법론을 통한 디자인개발을 진행하고 시제품 제작 시 소재 선정 기준에 대해 조사분석하여 선정된 소재인 CFRP(Carbon Fiber Reinforced Plastics) CNT(Carbon Nano Tube)를 동물용 X-ray 디텍터 패널부분에 적용하여 제품디자인 및 시제품 개발을 진행하고 CFRP CNT 패널을 적용하여 완성된 시제품을 Drop 테스트, 전면 외압 강도 시험, 방진/방수 성능 시험을 진행하여 야외환경에서 사용하는 휴대가능한 동물용 X-ray 디텍터로 활용이 가능한 제품임을 확인하였다.

• 한국화재소방학회논문지
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• 제26권5호
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• pp.41-47
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• 2012

첨단산업기술인 반도체, LCD 등 제조의 핵심공정인 클린룸은 생산제품의 성능 및 품질에 절대적인 영향을 미치는 가장 중요한 공정이다. 그러나 국내는 방화공학적인 측면에서 과학적이고 종합안전대책에 대한 체계적인 연구가 제대로 이루어지지 않고 있다. 본 연구는 LCD 제조공정 클린룸에 설치하는 제연시스템의 성능 및 문제점을 파악하여 이에 대한 개선방안을 도출하기 위하여 여러 시나리오를 고려한 화재시뮬레이션과 피난시뮬레이션을 통하여 분석하였다. LCD 제조공정의 클린룸 화재 및 연기확산에 대하여 분석한 결과 화재시 공조기의 연동정지는 반드시 필요하며 연기의 부력을 고려하여 FAB 상부에 배연을 할 수 있도록 하여야 한다. 또한 대규모 클린룸의 경우 화재특성상 스프링클러헤드의 집열 성능이 떨어지므로, 조기반응형 헤드의 설치 및 작동시간을 빠르게 하기 위한 보조장치를 설치하여야 한다. 특히, 대공간 클린룸은 자동화 공정으로 거주밀도가 낮지만, 복잡한 생산장비의 배치와 방진복을 착용하고 근무해야하는 환경특성 때문에 화재시 피난안전성능 확보가 어렵기 때문에 공정 내 위험요소의 철저한 관리 및 주기적인 교육과 훈련이 필요하며, 방재선진국의 기준에 준하는 수준의 국내 관련기술 기준을 정립할 필요가 있다.