• The Plant Pathology Journal
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• 제22권3호
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• pp.295-302
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• 2006

The present study addressed the efficacy of nanosized silica-silver for controlling plant pathogenic microorganisms. The nanosized silica-silver consisted of nano-silver combined with silica molecules and water soluble polymer, prepared by exposing a solution including silver salt, silicate and water soluble polymer to radioactive rays. The nanosized silica-silver showed antifungal activity against the tested phytopathogenic fungi at 3.0 ppm with varied degrees. In contrast, a number of beneficial bacteria or plant pathogenic bacteria were not significantly affected at 10 ppm level but completely inhibited by 100 ppm of nanosized silicasilver. Among the tested plant pathogenic fungi, the new product effectively controlled powdery mildews of pumpkin at 0.3 ppm in both field and greenhouse tests. The pathogens disappeared from the infected leaves 3 days after spray and the plants remained healthy thereafter. Our results suggested that the product developed in this study was effective in controlling various plant fungal diseases.

• 대한인간공학회지
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• 제28권4호
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• pp.161-166
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• 2009

Although the entrance of house has been identified as a hotspot for older adults' fall accidents, there was not any lift chair to prevent older adults' accidents. In this study, a lift chair was developed to reduce fall accidents that can occur when older adults put on or take off their shoes in the entrance. In order to develop the product, we considered two aspects. Firstly, we considered older adults' anthropometric data to determine the design specification of the product. Also we considered the environmental characteristics of space using the product. In order to overcome the limited spatial freedom and use the entrance space effectively, we took a simplified and folding type for the product.

• 한국정밀공학회지
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• 제21권1호
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• pp.11-16
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• 2004

• 디자인학연구
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• 제16권2호
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• pp.151-160
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• 2003

한국은 OECD국가중 노인의 증가 속도가 가장 빠른 것으로 나타나고 있으며, 앞으로의 노인인구 증가속도와 평균수명의 연장 기간을 볼 때 미래사회는 노인사회라고 해도 과언이 아닐 것이다. 따라서 65세 이상의 노인인구를 대상으로 한국의 실버시장 규모도 급히 큰 규모로 성장할 것이다. 고령사회에 이미 들어선 선진국은 실버용품 디자인에 대한 활발한 연구가 진행되어 왔으나, 우리나라의 연구는 이들 외국에 비해 매우 미흡한 실정이다. 곧 다가올 고령사회에서의 한국 노인들이 일상생활에서 사용하고 있는 생활용품디자인 에 대한 구체적이고 종합적인 연구가 시급히 필요하다. 본 연구는 고령화사회와 실버용품에 관한 내용을 문헌연구를 기본으로 연구하였고, 설문지를 이용한 심층면접조사방법을 병행하였다. 그 결과, 우리나라의 노인들은 실버산업에 대한 인식은 매우 높은 것으로 나타났다. 그러나 실버용품 자체에 대해서는 문제점이 많다고 지적을 하였다. 디자인 측면에서 노인들의 라이프 스타일 반영한 새로운 디자인이 필요하고, 노인의 특성을 고려한 사용하기 편한 제품개발이 절실하며, 손쉽게 구입할 수 있는 시스템이 있어야 할 것이다.

• Bulletin of the Korean Chemical Society
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• 제34권2호
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• pp.505-509
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• 2013

A low temperature ($65^{\circ}C$) thermal deposition process was developed for depositing a silver coating on thermally sensitive polymeric substrates. This low temperature deposition was achieved by chemical reduction of a silver alkylcarbamate complex with latent reducing agent. The effects of acetol as a latent reducing agent for the silver 2-ethylhexylcarbamate (Ag-EHCB) complex and their blend solutions were investigated in terms of reducing mechanism, and the size and shape of silver nanoparticles (Ag-NPs) as a function of reduced temperature and time, and PVP stabilizer concentration were determined. Low temperature deposition was achieved by combining chemical reduction with thermal heating at $65^{\circ}C$. A range of polymer film, sheet and molding product was coated with silver at thicknesses of 100 nm. The effect of process parameters and heat treatment on the properties of silver coatings was investigated.

• 대한화학회지
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• 제29권2호
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• pp.158-163
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• 1985

2M $AgNO_3$ 수용액을 백금이나 탄소 전극을 이용하여 비교적 높은 전류밀도에서 전해 산화하였다. 이 생성물을 산화력과 X-ray powder diffraction patterns, thermal analysis, 그리고 환원 곡선등을 구하여 $Ag_7O_8NO_3$ 임을 확인하고 끓는물에서 가수분해 하여 Alfa-product AgO보다 순도가 높고 비중이 큰 AgO를 얻을 수 있었다.

• 한국분말재료학회지
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• 제24권4호
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• pp.315-320
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• 2017

There has been much interest in recycling electronic wastes in order to mitigate environmental problems and to recover the large amount of constituent metals. Silver recovery from electronic waste is extensively studied because of environmental and economic benefits and the use of silver in fabricating nanodevices. Hydrometallurgical processing is often used for silver recovery because it has the advantages of low cost and ease of control. Research on synthesis recovered silver into nanoparticles is needed for application to transistors and solar cells. In this study, silver is selectively recovered from the by-product of electrodes. Silver precursors are prepared using the dissolution characteristics of the leaching solution. In the liquid reduction process, silver nanoparticles are synthesized under various surfactant conditions and then analyzed. The purity of the recovered silver is 99.24%, and the average particle size of the silver nanoparticles is 68 nm.

• Corrosion Science and Technology
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• 제7권2호
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• pp.130-133
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• 2008

Corrosion of silver by outgassed sulfur species from rubber has been investigated by means of quartz crystal microbalance technique (QCM) and cathodic reduction technique. Silver specimens were placed together with a rubber of predefined quantity in an enclosed environment. Corrosion progressed linearly with time and silver sulfide was found as the corrosion product during all the tests. No significant dependence on RH was observed, while the corrosion rate increased as temperature rose. Furthermore the corrosion rate increased logarithmically with the quantity of the rubber placed in the exposure environment. It may be suggested that the corrosion rate of silver is determined by the amount of outgassed sulfur species which is a function of temperature and the quantity of rubber contained in the exposure environment.

• 가정과삶의질연구
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• 제27권2호
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• pp.45-61
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• 2009

The purpose of this study was to develop an understanding of older consumers' lifestyle, and to provide the basic information for developing silver commodities and, in turn, to stimulate the silver industry which has received attention as a next-generation industry. The study divided elderly consumers into four lifestyle categories and analyzed the difference in demographic characteristics among these categories as well as differences in demand for silver products. Data were collected with questionnaire and analyzed with frequency analysis, factor analysis, K-means cluster analysis, one-way ANOVA, and a $x^2$ test using SPSS 15.0. Four different lifestyles categories were identified among elderly consumers : conservative and stability oriented (22 persons, 33.3% of the sample), progressive and relation oriented (22 persons, 15.0%), reality adapted (52 persons, 35.4%), and traditional (24 persons, 16.4%). The demand for silver products demands was significantly different among elderly consumers in the four different lifestyle groups.

• 방사선산업학회지
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• 제2권3호
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• pp.149-154
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• 2008

The present study described an antimicrobial spray composition comprising nanosized silica-silver particles, in which nano-silver is bound to silica molecules and a water-soluble polymer, the nanosized silica-silver particles prepared by irradiating a solution comprising a silver salt, silicate and the water-soluble polymer with radiation rays. According to a surfactant addition, the compositions were not turbid and were colorless. Also samples (cotton fabrics and wallpaper) were treated with the compositions also did not cause any stains even after drying under sunshine and at $80^{\circ}C$. Our results suggested that the spray formulation product was of practical use to control indoor fungi.