• 한국윤활학회:학술대회논문집
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• 한국윤활학회 2001년도 제33회 춘계학술대회 개최
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• pp.105-113
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• 2001

The effect of silver particle introduction on the rolling friction of AISI 52100 steel pairs has been investigated. Experiments were performed in dry conditions using a thrust bearing-type rolling test rig at a load range of 12 - 960 N and a sliding velocity range of 8 - 785 mm/sec with pure(99.99%) silver particles. Results showed that the introduced silver particles formed transfer layer, which protected virgin bearing surfaces and resulted in low rolling friction. By changing the quantity of silver particles, transitions in the rolling friction wear found. Results also showed that the variations in normal load and rolling speed also affected the rolling friction behavior. Analyses using SEM and EPMA showed that tile formation of transfer layer was mainly governed by the silver particle quantity, normal load and rolling speed, and this resulted in the different behavior of rolling friction. In this study, it was found that the low and stable rolling friction was resulted from the shakedown phenomena occurred at the silver transfer layer.

• Bulletin of the Korean Chemical Society
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• 제9권1호
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• pp.27-29
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• 1988

The surface-enhanced Raman scattering(SERS) of benzylcyanide in a silver sol was investigated. It was concluded that the molecule adsorbed onto the silver surface via the ${\pi}$ system of the CN group. The molecule was assumed to coordinate with either a single atom or two silver atoms. According to the SERS selection rule, the benzene ring of the adsorbed species seemed to assume a flat stance with respect to the silver surface.

• 한국콘텐츠학회논문지
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• 제13권8호
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• pp.211-228
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• 2013

본 연구에서 노인 소비자뿐만 아니라 미래 실버 소비자를 대상으로 인구사회학적 변인과 라이프스타일이 실버타운 선호도에 유의미한 영향을 미칠 것인지 그리고 인구사회학적 변인에 따라 라이프스타일과 실버타운 선호도에 차이가 있을 것인지를 고찰하고자 서울 경기지역과 대구 경북지역에 거주하는 30대~60대 남녀를 무작위로 설문조사하였다. 수집 자료의 통계처리는 SPSS Win Ver.18.0을 활용하여 분석하였다. 그 결과, 인구사회학적 변인 중에서 학력, 종교가 실버타운 선호도에 통계적으로 유의한 영향을 미치는 것으로 분석되었으며, 라이프스타일 특성이 실버타운 선호도에 미치는 영향을 분석한 결과, 가족을 추구하는 보수적 라이프스타일을 지닐수록 실버타운에 대한 선호도는 낮고, 건강을 추구하고 안전과 물질을 추구하는 라이프스타일을 지닐수록 실버타운 선호도가 더욱 높아지는 것으로 분석되었다. 그리고 인구사회학적 변인에 따라 라이프스타일과 실버타운 선호도에 차이가 있는 것으로 분석되었다.

• 멤브레인
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• 제25권1호
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• pp.1-6
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• 2015

기존의 올레핀 운반체로 알려진 은 나노입자는 입자 표면에서 프로필렌 기체와 상호작용을 하여 올레핀 촉진수송이 이루어진다고 알려졌다. 그러나 은 나노입자가 공기 중에 쉽게 산화되어 표면에 생성된 산화은(AgO 또는 $Ag_2O$)의 효과일 것으로 예상되었다. 산화은의 효과를 규명하기 위해, 고분자 PVP에 AgO 또는 $Ag_2O$를 5 wt%로 넣고 분산시킨 후 전자수용체 TCNQ 또는 p-BQ를 0.005~0.02%까지 넣어 분리막을 제조하였다. 전자수용체가 첨가되면 산화은의 표면에 양극성화도 분산 정도가 향상될 것으로 기대하였고, 이는 기체투과 성능과 XPS 그리고 TEM에 의해 분리막의 특성이 확인되었다.

• 한국응급구조학회지
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• 제11권3호
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• pp.191-204
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• 2007

This study analyzes use and operation of silver ambulance with 110 patients who had used silver ambulance in Gwangju and Jeonnam regions from June of 2006 to June of 2007 and 53 paramedics who are involved directly in ambulance operation and the results of this analysis are as follows. 1. Users' health conditions, 69.1% of users answered as bad and 67.3% suffered from chronic diseases over 3 months and it was found that they used silver ambulance due to their bad health conditions. 2. Cronbach's alpha was 0.630 and family function index was generally reliable and solution was high as 1.60, but total points were low as 7.11 and it was considered that they had family troubles. 3. On the question of ambulance use, 44.5% answered they used it because it is free, 53.6% used it for appointed medical examination and treatment and 18.1% used it for emergency. 4. Degrees of satisfaction with ambulance and paramedics were 95.4% and 76.4% respectively and 80.0% of ambulance users answered ambulance arrived quickly within 15 min. 5. Correlation($x^2 $) between family or relative's residence and frequency of visits was 86.367 and its significance probability was 0.00 and it was found that it was significant in the level of 0.1%, but correlation($x^2 $) between visitors other than family or relatives and frequency of visits was 14.768 and its significance probability was 0.25 and it was found that it was not significant in the level of 5%. 6. Correlation($x^2 $) between transfer operation speed and mobilization time was found that it was not significant in the level of 5%. Correlation($x^2 $) between their own health condition purpose of ambulance use was 13.802 an 5.696 and its significance probability was 0.93 and it was found that it was not significant in the level of 1%, and it was considered because paramedics carried patients with safe operation.

• Bulletin of the Korean Chemical Society
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• 제29권6호
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• pp.1179-1184
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• 2008

Commercial nanometer sized silver is widely used for its antibacterial effect; however, nanoparticles may also have ecotoxicological effects after being discharged into water. Nanometer sized silver can flow into aquatic environments, where it can exert a variety of physiologically effects in living organisms, including fish. The present study aimed to investigate the effect of nanometer sized silver on the development of zebrafish embryos, analyze the properties of commercial nanometer sized silver and define the toxicity relationship between embryogenesis and hatched flies. The commercial nanometer sized silver was analyzed in the $Ag^+$ ion form. The hatch rate decreased in the nano-silver exposed groups (10 and 20 ppt); furthermore, the hatched flies had an abnormal notochord, weak heart beat, damaged eyes and curved tail. The expression of the Sel N1 gene decreased in the nano-silver exposed groups, and the catalase activities of the exposed groups increased relative to those in the control group. Therefore, the $Ag^+$ ions in commercial nanometer sized silver could accumulate in aquatic environments and seriously damage the development of zebrafish embryos.

• 한국실내디자인학회:학술대회논문집
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• 한국실내디자인학회 2007년도 춘계학술대회 논문집
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• pp.119-124
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• 2007

This study focuses on the design guidelines for planning and implementing the spatial characteristics in the living environment for the New Silver-Generation through the case analysis of "Serviced Residence", which has recently become very popular due to active demands for handy functions and services in flew Silver-Generation living environment. Nowadays, with relaxation of the phenomenon of lack of available houses, the focus of the construction market has shifted from builders to customers. Also, with the advent of the New Silver-Generation with money to spend to improve the quality of their lives, there has been high demand for living environment that provides high-quality services for comfort and convenience. Means to provide high-quality services for comfort and convenience in New Silver-Generation environment warrant much consideration, and hence the current study on Serviced Residence, which has become very popular has been taken up. This study on Serviced Residence will point out the problems found in the current Silver Residence environment and it will serve as an alternative for the living environment of the Silver Generation.

• 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.

• 한국물환경학회지
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• 제22권1호
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• pp.122-127
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• 2006

Fundamental studies were carried out for an effective removal and recovery of silver from waste photo-developing solution by solvent extraction. The organic solvents examined for silver-extraction were ALIQUAT 336, D2EHPA, KELEX 100, and TBP. ALIQUAT 336, which is an anionic exchanger, was found to be efficient for the extraction of silver and the reason for this was considered to be due to the chloride ion contained in its structure. The extent of silver extraction was examined to increase with the concentration of ALIQUAT 336 until it reached 0.6 M and no more extraction was observed above this concentration. The extraction of silver by ALIQUAT 336 was found to reach its pseudo-equilibrium within a few minutes after the reaction started and additional slight increase in silver extraction was observed until 30 minutes of reaction time. The observed differences in silver extraction for artificial and actual waste solutions were considered to be based upon the different ionic form of silver-containing species in these solutions.

• 한국의류산업학회지
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• 제10권5호
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• pp.702-712
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• 2008

The aim of this study is to develop Casual Hanbok design made of Hanji yarn textiles for New Silver generation women. The New silver generation is a coined word which has meaning of a newly silver generation and it is distinguished from pre-silver generation. New silver generation is a generation that is independent and given active role by their age groups and generational characteristic. The concept of silver generation was introduced from maturity market in Japan. This study was based on analysis about their preference of forms, colors, and materials of Casual Hanbok. The survey target were 270 female over age 50 living in Daejeon City. The analysis methods used frequency and percentage. The results were summarized as following. Although almost of them haven't worn Casual Hanbok, they had the positive recognition on wearing one. They preferred longer length jacket to traditional Korean style, shorter length of skirt. They also preferred the traditional sleeve shape and knotted buttons. On the foundation of this fact, 2 styles consist of 5 Casual Hanbok design items made of functional material - Hanji yarn textiles that have antimicrobial, deodorant, quick drying, far infrared radiation which are not harmful to health - for New silver women were suggested. One style was 3 items - blouse, vest, skirt - which are the sense of Korean tradition with activity by patch. The other was 2 items - jacket and skirt - which are the sense of Korean tradition with modern way by quilting. Lastly, these garments were evaluated by 13 experts, they were satisfied with 2 styles and all items. As this study were based on the Elderly women living in Daejeon city, it had the limitation on applying of preference styles to all the New silver generation.