• ETRI Journal
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• 제26권6호
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• pp.647-652
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• 2004

A new ionic liquid, 1-vinyl-3-heptylimidazolium iodide (VHpII), was synthesized and applied as a redox electrolyte for dye-sensitized solar cells. The chemical structure of the synthesized VHpII was confirmed using $^1H$ NMR. Thermogravimetric analysis showed that the VHpII was stable for thermal stress of up to $250^{\circ}C$. The energy conversion efficiencies of the VHpII-based dye-sensitized solar cells were investigated in terms of the effect of a lithium iodide addition. A solar cell containing the redox couple of VHpII and iodine showed a conversion efficiency of 2.63% under 1 sun light intensity at AM 1.5. Adding 0.4 M LiI results in a conversion efficiency of 3.63%, which was an improvement of about 40%. The increased conversion efficiency was ascribed to an increase in external quantum efficiency.

• 대한화학회지
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• 제49권2호
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• pp.167-172
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• 2005

• 천문학회보
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• 제33권1호
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• pp.74-74
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• 2008

• 천문학회보
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• 제33권1호
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• pp.45.1-45.1
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• 2008

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2005년도 춘계학술대회
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• pp.147-149
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• 2005

Synthesis of $TiO_2$ nanoparticle paste is one of the important technologies in dye-sensitized solar cells (DSSC). Performances of the DSSCs from synthesized $TiO_2$ nanoparticle paste was similar or better than those from commercial sources. In addition. cell efficiency was further improved by using large scattering $TiO_2$ particles. Those results was utilized in manufacturing high efficiency DSSC modules.

• 한국안전학회지
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• 제6권2호
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• pp.21-30
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• 1991

In this paper, we study effect of waveness at the optical surface roughness measurement. In generally, waveness components cause errors in calculation of the roughness value of metal surface. We study about surface roughness signals In the frequency domain for separate two signal component of real roughness and waveness by digital signal processing methods. Thereafter, determine low and high Component of frequency spectrum. By this separating frequency value we design liner low and high pass filter which cutoff frequency is 1 Hz. After this process, converted each filtered spectrum by inverse discrete fourier transformation to time domain waveness and real roughness signals We calculate surface roughness value from filtered roughness signals. For evaluate this method, we use five specimens roughness signal which obtained from optical surface roughness measuring system in 3mm/s moving speed with 0.1 mm laser beam spot size As a result, we obtain more linerized roughness value than that of unfiltered roughness signals.

• Journal of Chest Surgery
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• 제49권6호
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• pp.461-464
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• 2016

Coronary artery disease has historically been a contraindication to lung transplantation. We report a successful combined bilateral lung transplantation and off-pump coronary artery bypass in a 62-year-old man. The patient had a progressive decline in lung function due to idiopathic pulmonary fibrosis and a history of severe occlusive coronary artery disease.

• 한국우주과학회:학술대회논문집(한국우주과학회보)
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• 한국우주과학회 2008년도 한국우주과학회보 제17권1호
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• pp.28.2-28.2
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• 2008

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 D
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• pp.2594-2596
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• 2005

Nowadays nuclear power plants does main part of our country electric-power resources, and is one of the lowest price material resources. This project is aim to retrofit nuclear power plants, also improves the reliance, safety, faculty of nuclear generator excitation system. This paper describes the contents

• 천문학회보
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• 제34권2호
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• pp.66.1-66.1
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• 2009