• Journal of Powder Materials
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• v.18 no.3
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• pp.226-237
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• 2011

W-ZrC and W-HfC composite powders were fabricated by the Plasma Alloying & Spheroidization (PAS) method and the powders were sprayed into hybrid coating layers by using Low Vacuum Plasma Spray (LVPS) process, respectively. Microstructure, mechanical properties, and ablation characteristics of the fabricated coating layers were investigated. The LVPS process led to successful production of W-Carbide hybrid coatings, approximately 400 ${\mu}M$ or above in thickness. As the substrate preheating temperature increased from $870^{\circ}C$ to $917^{\circ}C$, the hardness of the W-ZrC coating layer increased due to decreased porosity. Vickers hardness showed higher value (about 108.4 HV) in W-ZrC hybrid coating material compared to that of W-HfC while adhesive strength was found to be similar in both coating layers. The plasma torch test revealed good ablation resistance of the W-Carbide hybrid coating layers. The relatively high performance W-ZrC coating layer at the elevated temperature is thought to be attributed to both the strengthening effect of ZrC particle remained in the layer and the formation of ZrO2 phase with high temperature stability.

• Proceedings of the Korean Vacuum Society Conference
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• 2000.02a
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• pp.117-117
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• 2000

높은 광학적 투과성과 전기전도성을 갖는 ITO film은 solar cell같은 optoelectronic device나 휴대용 소형 TV, flat panel display 등의 투명전극으로 그 응용 분야가 광범위하여 많은 연구가 수행되어져 왔다. 기판으로서 유리를 사용할 때 생기는 활용범위 제한을 극복하고자 최근 유기물 위에 증착이 가능한 저온 증착방법에 대한 연구가 활발히 이루어지고 있다. 그 가운데 이온빔과 같은 energetic한 beam을 이용한 박막의 제조는 기판을 플라즈마 발생지역으로부터 분리시켜 이온빔의 flux 및 에너지, 입사각 등의 자유로운 조절을 통해 상온에서도 우수한 성질의 박막형성 가능성이 제시되어 지고 있다. ITO박막을 형성하는 방법 중 스프레이법이나 CVD법과 같은 화학적 증착방법은 증착시 350-50$0^{\circ}C$의 고온이 필요하고 현재 가장 많이 응용되어 지고 있는 sputter법은 15$0^{\circ}C$정도의 가열이 필요하므로 앞으로 응용가능성이 매우 커서 많은 연구가 진행중인 플라스틱과 아크릴 같은 flexible 한 기판위 증착에 적용이 불가능하다. 본 실험에서는 IBAD(Ion Beam Assisted Deposition)법을 이용하여 저온 ITO film을 유리와 유기막위에 증착하는 연구를 수행하였다. 유기막위에 증착된 ITO는 보다 가볍고 충격에 강하고 유리에 못지 않은 투과성을 가지고 있으나 현재 film의 quality 향상에 대한 요구가 증대되어 지고 있는 실정이다. 따라서, 본 실험에서는 dual oxygen ion gun의 조건변화에 따른 ITO film의 특성변화를 관찰하였다. 고정된 증？율에 한 개 ion gun에 ion flux를 고정시킨 후 또 다른 ion gun에서 발생하는 oxygen radical의 영향을 조사하였으며 oxygen radical의 rf power에 따른 변화는 OES(Optical emission spectroscopy)를 사용하였다. 너무 적은 oxygen ion beam flux나 oxygen radical은 film의 전도도 및 투과도를 저하시켰고 반면 너무 과도한 flux의 증가 시는 전도도는 감소하였고 투과도는 증가하는 경향을 보였다. 기판에 도달하는 oxygen ion flux는 faraday cup을 이용하여 측정하였으며 증착된 ITO film은 XPS, UV-spectrometer, 4-point probe를 이용하여 분석하였다.

• Solar Energy
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• v.10 no.2
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• pp.69-76
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• 1990

Photoelectrochemical decomposition of water by the irradiation of light to the $TiO_2$ thin film soaked in water was observed. The $TiO_2$ thin film was coated on top of $SnO_2$ nesa glass by use of spray method and of dip-coating method. The spray technique of $SnO_2$ nesa film production and dip-coating technique of $TiO_2$ thin film preparation on top of the $SnO_2$ nesa film were discribed briefly. $TiO_2$ film appearance was observed by SEM and I-V characteristic curve were measured for the various thickness of $TiO_2$ film. The film Thickness $1.8{\mu}m$ showed the maximum photoelectric current. Xe-lamp was used as light source for the photoelectrochemical reaction of thin film $TiO_2$ in acidic water(pH=1)

• FLOWER RESEARCH JOURNAL
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• v.17 no.2
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• pp.137-140
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• 2009

A new spary chrysanthemum(Dendranthema grandiflorum) cultivar 'Noble Wine' was developed from a cross between 'SL03-01' and 'Artist Pink' by selection of seedlings and lines at the Flower Research Institute, Gyeongnam Agricultural Research and Extention Services(ARES) from 2003 to 2007. Its characteristics were investigated three times from 2005 to 2007 under condition of forcing culture in spring and retarding culture in autumn. The natural flowering time of 'Noble Wine' was October 26th, and yearround production was possible by day length treatment. Its capitulum was 5.4 cm in diameter, and had 21.6 ray florets and 28.5 head per stem in autumn. Its ray floret was red-purple with green central zone. 'Noble Wine' was about 45 days in spring, and 'Noble Wine' showed the vase life of 21.3 days in autumn. This cultivar was registered for a commercialization in 2007.

• FLOWER RESEARCH JOURNAL
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• v.18 no.3
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• pp.211-215
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• 2010

A new spray chrysanthemum(Dendranthema grandiflorum) cultivar 'Magic' was developed from a cross combination between 'Artist Pink' and 'SP0347' by selection of seedlings and lines at the Flower Research Institute, Gyeongnam Agricultural Research and Extension Services(ARES) from 2003 to 2007. Its characteristics were investigated three times from 2005 to 2007 under condition of forcing culture in spring and retarding culture in autumn. The natural flowering time of 'Magic' was October 26th, and year-round production was possible by day length treatment. Its capitulum was 6.1 cm in diameter, and had 31.9 ray florets and 11.7 head per stem in autumn. Its ray floret was white-purple with yellow green central zone. Days to flower of 'Magic' was about 43 days in spring, and 'Magic' showed the vase life of 20.6 days in autumn. This cultivar was registered for a commercialization in 2007.

• FLOWER RESEARCH JOURNAL
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• v.16 no.4
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• pp.229-233
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• 2008

A new spary chrysanthemum(Dendranthema grandiflorum) cultivar 'Moulin Rouge' was developed from a cross between 'Delmont' and 'Anjela' by selections of seedlings and lines at the Flower Research Institute, Gyeongnam Agricultural Research and Extension Services(ARES) from 2002 to 2006. Its characteristics were investigated three times from 2004 to 2006 under condition of forcing culture in spring and retarding culture in autumn. The natural flowering time of 'Moulin Rouge' was October 24th, and year-round production was possible by day length treatment. Its capitulum was 5.3 cm in diameter, and had 22.9 ray florets and 12.2 head per stem in autumn. Its ray floret was bi-color(yellow/orange) with green central zone. 'Moulin Rouge' was about 55 days to flower in spring, and showed the vase life of 21.7 days in autumn. This cultivar was registered for a commercialization in 2007.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.37 no.2
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• pp.195-201
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• 2024

The low-temperature deposition of BaNi_(2-x)Co_xFe₁₆O₂₇ thin films with a Ba hexaferrite structure for electromagnetic shielding was studied. The BaNi_(2-x)Co_xFe₁₆O₂₇ thin films produced through the spin spray process were suitable for thin film deposition on a flexible substrate because it crystallized well at low temperature below 90℃. The change in shielding characteristics depending on the Co content of the BaNi_(2-x)Co_xFe₁₆O₂₇ thin film was investigated, and excellent shielding characteristics with S21 of -1 dB were obtained in a wide frequency range of 26~40 GHz when the Co content was 0.4 or more. The purpose of this study is to analyze changes in shielding properties caused by change in Co content in relation to phase changes in BaNi_(2-x)Co_xFe₁₆O₂₇ and obtain basic data for developing excellent flexible electromagnetic wave shielding materials.

• Science of Emotion and Sensibility
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• v.14 no.1
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• pp.117-126
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• 2011

This study investigates the physical properties and manufacturing method of shape memory fabric for emotional garment made by polypropylene. For this purpose, polypropylene(PP) POY and SDY were texturized using low temperature and constant length heat treatment texturing technologies, respectively. The shape memory fabrics made using these texturized PP yarns were woven with two kinds of PET and PTT shape memory yarns on the air-jet loom and the various physical properties of four kinds of shape memory fabrics were measured and discussed. The tenacity and breaking strain of PP texturized yarns treated by low temperature and constant length heat treatment showed high weaving efficiency and the wet thermal shrinkage of PP textured yarns was shown less than 1.5%, dry thermal shrinkage was ranged between 3% and 5%, which means thermal stability compared to the PTT textured yarn with high thermal shrinkage, 5~8%. The shape memory characteristics of PP shape memory fabrics measured by Toray method showed five grade as same value as PTT shape memory fabric. The heat keeping property of the PP shape memory fabric showed 56% higher value than that of PTT shape memory fabric. The water repellency of PP shape memory fabric measured by spray method showed five grade as same value as PTT shape memory fabric treated with water repellent agent. Especially, shape memory properties of PP shape memory fabric measured by 3-D image and camera measurement methods showed similar characteristics to the PTT shape memory fabric.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.1
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• pp.569-574
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• 2014

We developed and evaluated a fluorescence-based optical DO sensor (OS-100, Global Optical Communication Ltd., Korea) for long-term monitoring of the dissolved oxygen concentration in waste water treatment. Fluorescent sensing membrane containing $Ru(Dpp)_3{^{2+}}$ (tris(4,7diphenyl-1, 10-phenanthroline) ruthenium(II)) was prepared with GA sol-gel matrix and coated on a quartz plate by sprayed method. Properties of sensor film exhibit deviation about ${\pm}1%$ under wide range of DO concentration from 3 to 10. The developed optical DO sensor was actually mounted in waste water from dyeing industry and successfully applied for on-line DO monitoring. Online monitoring results showed the changes of DO concentrations in wastewater treatment processes with accuracy better than ${\pm}2%$ during the 6 months measurements period in vicious environmental conditions.

• Journal of the Korean Electrochemical Society
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• v.13 no.4
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• pp.256-263
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• 2010

A Crofer 22 APU mesh coated with a conductive ceramic material was developed as an alternative cathode current collector to Ag-based materials for solid oxide fuel cells. $(La_{0.80}Sr_{0.20})_{0.98}MnO_3$ (LSM) layer was deposited onto the Crofer mesh using a spray-coating technique, in an attempt to mitigate the degradation of electrical properties due to surface oxidation at high temperatures. The oxidation experiments at $800^{\circ}C$ in air indicated that the areaspecific resistance (ASR) of the LSM-coated Crofer mesh was strongly dependent on the wire diameter and the contact morphology between mesh and cell. In addition, the post-heat-treatment in $H_2/N_2$ resulted in a reduced thickness of Cr-containing oxide scales at the interface between Crofer mesh and LSM layer, leading to a decreased ASR.