• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2012년도 춘계학술대회 논문집
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• pp.789-790
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• 2012

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2012년도 추계학술대회 논문집
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• pp.575-576
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• 2012

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2012년도 추계학술대회 논문집
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• pp.585-586
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• 2012

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2013년도 춘계학술대회 논문집
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• pp.1543-1544
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• 2013

• 대한토목학회논문집
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• 제33권4호
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• pp.1665-1673
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• 2013

최근 건설 산업에서는 기능과 조형미를 갖춘 비정형 구조물에 대한 관심과 수요가 증가하고 있는 추세이다. 거푸집 기반의 시멘트 구조물은 구조물의 강도, 시공의 용이성, 치수 정확도, 표면 거칠기 등의 측면에서 장점들을 가지고 있지만, 다양한 비정형 구조물을 건설하는 데 있어서는 공사비용과 공사 기간을 증가시키는 한계점이 있다. 이러한 한계를 극복하기 위하여, 미국과 영국에서는 이미 쾌속 조형 기술을 건설 분야에 적용시킨 Contour Crafting이나 Concrete Printing과 같은 적층 시공 시스템이 산 학 간의 공동연구를 통해 개발되었다. 국내에서는 이에 관련된 연구가 전무하여, 본 기술로부터 융합 및 파생될 수 있는 가능성이 가로막힌 실정이다. 본 논문에서는 거푸집 없이 자유 곡면 형태의 구조물을 시공할 수 있는 자동화 적층 시공 시스템의 프로토타입 개발에 관련된 기계, 제어 시스템을 포함한 설계 요소들에 관하여 기술하였다. 적층형 시공에 적합한 재료는 섬유보강모르타르를 압축강도, 유동성 및 점도, 경화시간 실험을 통하여 선정하였다. 선정한 모르타르 배합비로 자동화 적층 시공 시스템에서 이송 및 압출 실험을 수행함으로써 적층 시공 시스템의 성공적 개발 가능성을 입증하였다. 본 연구의 결과를 기초로 향후 자동화 적층 시공 시스템을 보완한다면 토목 및 건축의 다양한 응용 분야에 확대하여 적용할 수 있을 것으로 기대된다.

• 한국결정성장학회지
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• 제21권3호
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• pp.119-123
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• 2011

Carbon nanotilaments (CNFs) could be synthesized on nickel catalyst layer-deposited silicon oxide substrate using $C_2H_2$ and$H_2$ as source gases under thermal chemical vapor deposition system. By the incorporation of $SF_6$ as a cyclic modulation manner, the geometries of carbon coils-related materials, such as nano-sized coil and wave-like nano-sized coil could be observed on the substrate. The characteristics (formation density and morphology) of as-grown CNFs with or without $SF_6$ incorporation were investigated. Diameter size reduction for the individual CNFs-related shape and the enhancement of the formation density of CNFs-related material could be achieved by the incorporation of $SF_6$ as a cyclic modulation manner. The cause for these results was discussed in association with the slightly increased etching ability by $SF_6$ addition and the sulfur role in SF 6 for the geometry change.

• Transactions on Electrical and Electronic Materials
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• 제15권6호
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• pp.344-347
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• 2014

This study was carried out on DLC thin film deposition technology used in infrared optical system production as a method of reducing the shape changes of the molding core and the consequent loss of life. Experiments on the deposition on silicon wafer and tungsten carbide used as a substrate for molding core were conducted at each processing condition using a filtered arc system, and it was found that the surface and mechanical properties were of the greatest quality when the substrate bias voltage of -150 V was used. In addition, it was confirmed that the PV and Ra characteristics were improved by the deposition of the DLC thin film.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1995년도 추계학술대회 논문집
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• pp.97-101
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• 1995

GaN films were prepared on Si(111) substrates by hydride vapor phase epitaxy (HVPE) on HCl-NH$_3$-N$_2$gas system. Effects of HCl gas flow rate on the film investigate under deposition conditions of flow time of 10min, 20min, 30min. The deposition rate increased with increasing HCl gas flow rate in the range of 10cc/min to 40cc/min and deposition time. Strung (00.2) oriented GaN film was obtained at a lower HCl flow rate and improved of the surface morphology.

• 한국정밀공학회지
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• 제26권10호
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• pp.74-80
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• 2009

This paper presents a study on fluid flow analysis of organic semiconductor thin film deposition process using the computational numerical method. In the production process, the thickness of deposited organic thin film depends on distribution of nozzle size in the linear cell system, so we analyze to decide the optimal nozzle system for uniform thickness of organic thin film. The results of deposited thickness of thin film by numerical analysis are in good agreement with those of the experimental measurements.

• 대한화장품학회지
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• 제29권1호
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• pp.89-101
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• 2003

A new collolidal silver (Ag) system is present in which a fine colloidal Ag is in situ deposited onto functionalized porous poly(ethylene glycol dimethacrylate) (poly (EGDMA)) microspheres. The effectiveness of Ag deposition was investigated considering the surface characteristics of poly (EGDMA) microspheres, The result reported in this study illustrates that the control of surface area and surface functionality (in this study, a hydroxyl group) of poly (EGDMA) microspheres is an important factor that determines practically the degree of deposition of colloidal Ag. The x-ray analysis showed that Ag nanoparticles were dispersed evenly inner and outer surfaces and has a face center cubic(fcc) phase. In the preservation test, the Ag-containing poly (EGDMA) microspheres had a powerful anti-bacterial performance, showing a high potential for a new preservative.