• 한국진공학회:학술대회논문집
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• 한국진공학회 2016년도 제50회 동계 정기학술대회 초록집
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• pp.303.1-303.1
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• 2016

Polymer-like amorphous carbon films were deposited on polyethylene naphthalate (PEN) substrate by plasma-enhanced chemical vapor deposition (PECVD) and their water vapor transmission rates (WVTR) were tested. propane was used as precursors. To make a polymer-like amorphous carbon film the deposition rate, surface roughness, light transmittance, and WVTR of the films were characterized as a function of the precursor feed ratio and plasma power. The water vapor transmission rates of bare PEN film and single layer PAC on PEN substrate were 6.95 g/m2/day and 0.3 g/m2/day, respectively. The superior property the water vapor permeability of thin layers of PAC was attributed to uniform coverage and good adhesion between PAC film and PEN substrate.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2009년도 추계학술대회 논문집
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• pp.399-401
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• 2009

Transparent conductive metal oxide films of $In_{2-x}Ti_xO_3$ (ITiO) and $In_{2-x}Sn_xO_3$ (ITO) were deposited by RF magnetron sputtering at substrate temperature of $300^{\circ}C$ and at high rate (${\sim}10$nm/min). Electrical and optical properties of the films were investigated as well as film structure and morphology, as it is compared with the commercial F:$SnO_2$ (FTO) glass. Near infrared ray transmittance of ITiO is the highest for wavelengths over 1000nm, which can increase dye sensitized compared to ITiO and FTO. Dye-sensitized solar cells (DSCs) were fabricated using the ITiO, ITO and FTO. Photoconversion efficiency (${\eta}$) of DSC using ITiO is 5.5%, whereas 5.0% is obtained from DSC with ITO. both at 100 mW/$cm^2$ light intensity.

• E2M - 전기 전자와 첨단 소재
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• 제1권1호
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• pp.62-69
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• 1988

Te-thin films were highly proper material for optical recording media, but has the demerit of short archival life time due to the unstability to humidity. In order to restrain the degradation, Te$_{100-x}$Se$_{x}$ alloys adding Se stable for the humidity were fabricated. Primarily, to measure the degradation rate with varing the composition of Se to x=5, 10, 14, 25 at.% at Te$_{100-x}$ Se$_{x}$, the change of light transmittance was used in various temperature-humidity environments. As the results, it was showed that Se$_{86}$Te$_{14}$ thin was the most proper composition for the improvement of degradation restraint.int.int.

• Journal of Ceramic Processing Research
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• 제13권spc2호
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• pp.260-264
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• 2012

We have investigated the effect of ambient gases on the structural, electrical, and optical characteristics of IZO thin films intended for use as anode contacts in the organic light emitting diodes (OLED) devices. These IZO thin films were deposited on the PES film by radio frequency (RF) magnetron sputtering under different ambient gases (Ar, Ar + O2, and Ar + H2) at room temperature. In order to investigate the influences of the ambient gases, the flow rate of oxygen and hydrogen in argon has been changed from 0.1 sccm to 0.5 sccm, respectively. All the IZO thin film has an (222) preferential orientation regardless of ambient gases. The electrical resistivity of the IZO film increased with increasing O2 flow rate, whereas the electrical resistivity decreased sharply under an Ar + H2 atmosphere and was nearly similar regardless of the H2 flow rate. The change of electrical resistivity with changes in the ambient gas composition was mainly interpreted in terms of the charge carrier concentration rather than the charge carrier mobility. All the films showed the average transmittance over 85% in the visible range. The OLED device was fabricated with different IZO substrates made with the configuration of IZO/α-NPD/DPVB/Alq3/LiF/Al in order to elucidate the performance of the IZO substrate. The current density and the luminance of OLED devices with IZO thin films deposited in 0.5 sccm H2 ambient gas are the highest amongst all other films.

• 한국잡초학회지
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• 제13권2호
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• pp.138-150
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• 1993

본(本) 실험(實驗)은 환경요인(環境要因)의 변동(變動)에 따른 벗풀의 생장(生長) 및 지하경번식체(地下莖繁殖體) 생산량(生産量)을 조사(調査)하여 벗풀의 합리적(合理的)인 방제법(防除法)을 확립(確立)하는데 기초자료(基礎資料)로 활용(活用)하고자 하였는 바 다음과 같은 결과(結果)를 얻었다. 1. 광량(光量)의 차이(差異)에 따른 벗풀의 엽수(棄數)와 화경수(花莖數)는 차광정도(遮光程度)가 클수록 감소(滅少)하였고 엽폭(葉幅)은 증가(增加)하였으며 초장(草長)은 노지(露地)에서 가장 짧았다. 벗풀의 지상부(地上部) 건물중(乾物重), 지하경(地下莖)의 수(數) 및 생체중(生體重)은 50%이하(以下) 광량(光量)에서는 광량(光量)간 유의차(有意差)가 없었으나 30% 이하(以下) 광량(光量)에서는 현저(顯著)히 저하(低下)되었다. 2. 광질(光質)의 차이(差異)에 따른 벗풀의 초장(草長)은 노지(露地)에서 가장 짧았으나 엽수(葉數)는 가장 많았다. 엽장(葉長)은 녹색(綠色)필름처리(處理)에서 가장 짧았고 엽폭(葉幅)은 노지(露地)와 수명(透明)필름처리(處理)에서 좁았다. 지상부(地上部) 건물중(乾物重)은 수명(透明) 및 녹색(綠色)필름처리(處理)에서 많았고 기타(其他) 광량간(光量間)에는 유의차(有意差)가 없었다. 지하경(地下莖)의 수(數)와 생체중(生體重)은 녹색(綠色)필름처리(處理)에서 가장 적었고 노지(露地)와 수명(透明)필름처리(處理)에서 많았다. 3. 초장(草長)은 0-5cm 담수심(湛水深)에서보다 10-20cm 담수심(湛水深)에서 길었고, 담수심(湛水深)이 깊어질수록 엽수(棄數)는 적었다. 엽장(葉長)과 화경수(花莖數)는 담수심(湛水深) 변동(變動)에 큰 영향(影響)이 없었다. 지상부(地上部) 건물중(乾物重), 지하경(地下莖)의 수(數) 및 생체중(生體重)은 0cm 담수심(湛水深)에서 가장 많았고 20cm 담수심(湛水深)에서 가장 적었다. 4. 벗풀의 초장(草長), 엽수(棄數)및 엽장(葉長)은 시비량(施把量)이 많을수록 증가(增加)하는 경향(傾向)이었으나 화경수(花莖數)는 시비량(施把量)에 영향(影響)이 적엇다. 벗풀의 지상부(地上部) 건물중(乾物重) 및 지하부(地下部) 번식체(緊植體) 생산량(生産量)은 시비량(施把量)의 증가(增加)에 따라 증가(增加)하였다. 5. 벗풀 지하경(地下莖)의 중량(重量)의 차이(差異)는 생육(生育)에 영향(影響)이 적었고, 지상부(地上部) 건물중(乾物重)에도 큰 영향(影響)이 없었으나 지하부(地下部) 번식(緊植) 생산량(生産量)은 재식(栽植)한 지하경(地下莖)의 중량(重量)이 클수록 증가(增加)하였다. 6. 출수기(出穗期)의 온도조건(溫度條件)에 따른 벗풀의 생육량(生育量)은 $35^{\circ}C$에서 보다$25^{\circ}C$에서 다소(多少) 적었고 생성(生成)된 지하경(地下莖)의 수(數)와 생체중(生體重)도 적었다.

• 융합신호처리학회논문지
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• 제24권4호
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• pp.249-254
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• 2023

최근 드론을 활용한 농약 살포 임무로 농민들의 작업 시간을 절약하고 농약 및 인체 유해성으로부터 보호되어 드론 보급이 활성화되고 있다. 기존 농약 살포 방식인 광역방제기와 헬기 방제에서 파생된 여러 단점 보완이 가능하다. 최근에는 스마트팜 확대 정책으로 IoT 기반의 다양한 작물의 생육 정보를 실시간 모니터링하고 핵심 변수에 대한 빅데이터 수집을 통해 최적의 생육 환경을 구축하여 수확 증대를 통한 농민의 수익 창출에 적극 활용되고 연관 드론 산업 기술도 발전되고 있다. 본 연구에서는 농업응용 분야의 다양성을 확보하기 위해서 비닐하우스 차광을 위한 작업에 드론을 적용하였고 차광막 살포와 관련된 기술 구현을 구체화하기 위하여 비닐하우스 환경에 대한 기초 연구를 실시하였다. 비닐하우스의 내부와 외부 환경을 고려하여 양질의 빛을 제공하기 위해 드론 노즐의 균일 살포를 위한 노즐설계, 비닐하우스의 투광률 분석, 차광제 도포 실험을 통하여 드론을 활용한 차광임무가 가능하도록 하는 기초연구를 수행하였다.

• 반도체디스플레이기술학회지
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• 제12권4호
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• pp.49-54
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• 2013

In this study, we have investigated the effect of the substrate temperature and oxygen flow rate on the characteristics of IZO thin films for the OLED (organic light emitting diodes) devices. For this purpose, IZO thin films were deposited by RF magnetron sputtering at room temperature and $300^{\circ}C$ with various $O_2$ flow rate. In order to investigate the influences of the oxygen, the flow rate of oxygen in argon mixing gas has been changed from 0.1sccm to 0.5sccm. IZO thin films deposited at room temperature show amorphous structure, whereas IZO thin films deposited at $300^{\circ}C$ show crystalline structure having an (222) preferential orientation regardless of $O_2$ flow rate. The electrical resistivity of IZO film increased with increasing flow rate of $O_2$ under Ar+$O_2$. The change of electrical resistivity with increasing flow rate of $O_2$ was mainly interpreted in terms of the charge carrier concentration rather than the charge carrier mobility. The electrical resistivity of the amorphous-IZO films deposited at R.T. was lower than that of the crystalline-IZO thin films deposited at $300^{\circ}C$. The change of electrical resistivity with increasing substrate temperature was mainly interpreted in terms of the charge carrier mobility rather than the charge carrier concentration. All the films showed the average transmittance over 85% in the visible range. The current density and the luminance of OLED devices with IZO thin films deposited at room temperature in 0.1sccm $O_2$ ambient gas are the highest amongst all other films. The optical band gap energy of IZO thin films plays a major role in OLED device performance, especially the current density and luminance.

• 반도체디스플레이기술학회지
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• 제11권4호
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• pp.25-30
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• 2012

In this study, we have investigated the effect of the substrate temperature and oxygen flow rate on the characteristics of IZO thin films for the organic light emitting diodes (OLED) devices. For this purpose, IZO thin films were deposited by RF magnetron sputtering at room temperature and $300^{\circ}C$ with various $O_2$ flow rate. In order to investigate the influences of the oxygen, the flow rate of oxygen in argon mixing gas has been changed from 0.1sccm to 0.5sccm. IZO thin films deposited at room temperature show amorphous structure, whereas IZO thin films deposited at $300^{\circ}C$ show crystalline structure having an (222) preferential orientation regardless of $O_2$ flow rate. The electrical resistivity of IZO film increased with increasing flow rate of $O_2$ under $Ar+O_2$. The change of electrical resistivity with increasing flow rate of $O_2$ was mainly interpreted in terms of the charge carrier concentration rather than the charge carrier mobility. The electrical resistivity of the amorphous-IZO films deposited at R.T. was lower than that of the crystalline-IZO thin films deposited at $300^{\circ}C$. The change of electrical resistivity with increasing substrate temperature was mainly interpreted in terms of the charge carrier mobility rather than the charge carrier concentration. All the films showed the average transmittance over 83% in the visible range.

• 반도체디스플레이기술학회지
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• 제12권2호
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• pp.33-37
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• 2013

In this study, we have investigated the effect of the substrate temperature and hydrogen flow rate on the characteristics of IZO thin films for the organic light emitting diodes (OLED) devices. For this purpose, IZO thin films were deposited by RF magnetron sputtering at room temperature and $300^{\circ}C$ with various $H_2$ flow rate. In order to investigate the influences of the oxygen, the flow rate of hydrogen in argon mixing gas has been changed from 0.1sccm to 0.9sccm. IZO thin films deposited at room temperature show amorphous structure, whereas IZO thin films deposited at $300^{\circ}C$ show crystalline structure having an (222) preferential orientation regardless of $H_2$ flow rate. The electrical resistivity of IZO film decreased with increasing flow rate of $H_2$ under Ar+$H_2$. The change of electrical resistivity with increasing flow rate of $H_2$ was mainly interpreted in terms of the charge carrier concentration rather than the charge carrier mobility. The electrical resistivity of the amorphous-IZO films deposited at R.T. was lower than that of the crystalline-IZO thin films deposited at $300^{\circ}C$. The increase of electrical resistivity with increasing substrate temperature was interpreted in terms of the decrease of the charge carrier mobility and the charge carrier concentration. All the films showed the average transmittance over 83% in the visible range.

• 한국대기환경학회지
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• 제18권3호
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• pp.223-230
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• 2002

Titania photocatalytic oxidation reactors were studied to investigate degradation efficiencies of hydrocarbons. In general, it is well known phenomena that thin layered titania oxidizes most of hydrocarbons to carbon dioxide and water under UV light. In this study, degradation efficiencies were measured due to changes in reactor structures, UV sources, the number of titania coatings, and various hydrocarbon chemicals. It was proven that gas degradation efficiencies are related to such factors as UV transmittance of coating substance, collision area of surface, and gas flow rate. For packing type annular reactor, about 98% degradation efficiency was achieved for achieved for propylene of 500 ppm level at a flow rate of 100 ml/min. Several gases were also tested for double-coated titania thin film under the condition of continuous flow of 100 ml/min and 365 nm UV source. It was shown that degradation efficiencies were decreasing in the order: $C_3$ $H_{6}$, n-C$_4$ $H_{10}$, $C_2$ $H_4$, $C_2$ $H_2$, $C_{6}$ $H_{6}$ and $C_2$ $H_{6}$./. 6/./.