Cu 입자가 분산된 Al₂O₃ 다공체의 제조 및 항균특성

유호석,김민성,오승탁,현창용,Yoo, Ho-Suk,Kim, Min-Sung,Oh, Sung-Tag,Hyun, Chang-Yong 한국분말야금학회 2014 한국분말재료학회지 (KPMI) Vol.21 No.1

In order to fabricate the porous $Al_2O_3$ with dispersion of nano-sized Cu particles, freeze-drying of camphene/$Al_2O_3$ slurry and solution chemistry process using Cu-nitrate are introduced. Camphene slurries with 10 vol% $Al_2O_3$ was frozen at $-25^{\circ}C$. Pores were generated by sublimation of the camphene during drying in air. The sintered samples at 1400 and $1500^{\circ}C$ showed the same size of large pores which were aligned parallel to the sublimable vehicles growth direction. However, the size of fine pores in the internal walls of large pores decreased with increase in sintering temperature. It was shown that Cu particles with the size of 100 nm were homogeneously dispersed on the surfaces of the large pores. Antibacterial test using fungus revealed that the porous $Al_2O_3$/1 vol% Cu composite showed antifungal property due to the dispersion of Cu particles. The results are suggested that the porous composites with required pore characteristics and functional property can be fabricated by freeze-drying process and addition of functional nano particles by chemical method.

전기방사 조건에 따른 나노섬유상의 구조 및 응용

유호석,박진수,RYU, HO SUK,PARK, JIN SOO 한국수소및신에너지학회 2018 한국수소 및 신에너지학회논문집 Vol.29 No.1

Electrospinning is a versatile technique that utilizes electrostatic forces to produce very thin and fine fibers of polymer ranging from submicron to nanometer scale. The technique can be applied to fibers of a various polymer types. Working parameters in the electrospinning are very important to understand not only the nature of electrospinning but also the conversion of polymer solutions into nanofibers through electrospinning. Those parameters in the electrospinning can be broadly divided into three parts. The first parameter is solution parameters such as molecular weight of polymer, concentration, viscosity, surface tension and conductivity/surface charge density of solution. The second parameter is process such as voltage, distance between the collector and the tip of the syringe, shape of collectors, flow rate. The third parameter is ambient parameters such as humidity and temperature. Fibers which made by electrospinning with working parameters are applied for various fields according to shape such as medical, cloth, photodiode, a sensor technology, catalyst, filtration, battery etc.

나노크기 Cu 분산입자를 갖는 Al₂O₃ 다공체의 제조 및 미세조직 특성

유호석,김안기,현창용,Yoo, Ho-Suk,Kim, An-Gi,Hyun, Chang-Yong 한국재료학회 2013 한국재료학회지 Vol.23 No.1

Porous $Al_2O_3$ dispersed with nano-sized Cu was fabricated by freeze-drying process and solution chemistry method using Cu-nitrate. To prepare porous $Al_2O_3$, camphene was used as the sublimable vehicle. Camphene slurries with $Al_2O_3$ content of 10 vol% were prepared by milling at $50^{\circ}C$ with a small amount of oligomeric polyester dispersant. Freezing of the slurry was done in a Teflon cylinder attached to a copper bottom plate cooled to $-25^{\circ}C$ while unidirectionally controlling the growth direction of the camphene. Pores were subsequently generated by sublimation of the camphene during drying in air for 48 h. The green body was sintered in a furnace at $1400^{\circ}C$ for 1 h. Cu particles were dispersed in porous $Al_2O_3$ by calcination and hydrogen reduction of Cu-nitrate. The sintered samples showed large pores with sizes of about $150{\mu}m$; these pores were aligned parallel to the camphene growth direction. Also, the internal walls of the large pores had relatively small pores due to the traces of camphene left between the concentrated $Al_2O_3$ particles on the internal wall. EDS analysis revealed that the Cu particles were mainly dispersed on the surfaces of the large pores. These results strongly suggest that porous $Al_2O_3$ with Cu dispersion can be successfully fabricated by freeze-drying and solution chemistry routes.

스포츠 브랜드 네이티브 광고의 콘텐츠 소재와 발신자 유형이 광고효과에 미치는 영향

유호석 ( Ho-suk Yoo ),한진욱 ( Jin-wook Han ),이인엽 ( In-yup Lee ) 한국체육학회 2021 한국체육학회지 Vol.60 No.1

본 연구는 스포츠브랜드 네이티브 광고의 콘텐츠 소재(동영상/이미지)와 발신자 유형(기업/소비자)이 광고효과(브랜드 태도/브랜드 신뢰도)에 미치는 영향을 규명하는 것에 그 목적이 있다. 이러한 연구 목적을 달성하기 위해 모바일 페이스북 사용 경험이 있는 수도권 소재 대학(원)생을 본 연구의 모집단으로 선정한 후, 비확률 표본추출법인 편의표본추출법을 통해 총 108명의 표본을 추출한 다음 온라인 설문조사를 실시하여 자료를 수집하였다. 자료처리는 SPSS 23.0을 통해 빈도분석, 탐색적 요인분석, 신뢰도 분석, 독립표본 t-검증 및 다변량 이원분산분석을 실시하였고, 분석 결과는 다음과 같다. 첫째, 스포츠 브랜드 네이티브 광고에서 이미지 광고보다 동영상 광고가 광고효과에 긍정적인 영향을 미치는 것으로 나타났다. 둘째, 스포츠 브랜드 네이티브 광고에서 기업 발신자 유형보다 소비자 발신자 유형이 광고효과에 긍정적인 영향을 미치는 것으로 나타났다. 셋째, 네이티브 광고 발신자 유형과 콘텐츠 소재간의 상호작용 효과는 통계적으로 유의한 것으로 나타났다. 연구결과에 대한 논의와 함께 마케팅 시사점 및 후속 연구기회를 제시하였다. The purpose of this study was to investigate the effects of content materials (video/image) and sender types (corporate/consumer) on advertising effects (brand attitude/brand reliability). To achieve this purpose, collegiate students in the metropolitan area who had ever used mobile Facebook were defined as a population of this study. A total of 108 samples were conveniently selected and responded to an online survey. The data analyses included frequency analysis, exploratory factor analysis, reliability analysis, independent sample t-test and multivariate two-way MANOVA using SPSS 23.0. The results of the study were as follows. Firstly, a video advertisement type had a positively stronger effect on advertising effect than an image advertisement type did in the context of sport brand native advertisements. Secondly, the consumer caller type had a positively stronger effect on the advertising effect than the corporate caller type had. Thirdly, it was found that the interaction effect between the advertising sender type and the content material was statistically significant. Additionally, marketing implications and future research opportunities were also suggested.

유튜브(YouTube) 스포츠 콘텐츠 이용자의 구독동기와 썸네일 유형이 구독지속의도에 미치는 영향

유호석(Yoo, Ho-Suk),한진욱(Han, Jin-Wook),김기백(Kim, Ki-Baek) 한국스포츠산업경영학회 2022 한국스포츠산업경영학회지 Vol.27 No.5

인스타그램 인플루언서 유형과 유행혁신성이 스포츠 브랜드 제품 구매의도에 미치는 영향

유호석(Yoo, Ho-Suk),한진욱(Han, Jin-Wook) 한국스포츠산업경영학회 2021 한국스포츠산업경영학회지 Vol.26 No.5

본 연구의 목적은 인스타그램의 인플루언서 유형과 유행혁신성이 스포츠브랜드 제품 구매의도에 미치는 영향과 두 변수 간의 상호작용 효과를 규명하는 데 있다. 이러한 연구목적을 달성하기 위해 인스타그램 사용 경험이 있는 수도권 소재 대학(원)생을 본 연구의 모집단으로 선정한 후, 비확률 표본추출법인 편의표본추출법을 통해 총 108명의 표본을 추출한 다음 온라인 설문조사를 실시하여 자료를 수집하였다. 자료처리는 SPSS 23.0을 통해 빈도분석, 탐색적 요인분석, 신뢰도 분석, 독립표본 t-검정, 이원 공분산분석을 실시하였고, 분석 결과는 다음과 같다. 첫째, 조사대상자들은 인스타그램 인플루언서 유형 중 셀 마켓 유형보다 리뷰 유형에 더 높은 구매의도를 보이는 것으로 나타났다. 둘째, 조사대상자 중 유행혁신성이 높은 집단이 낮은 집단보다 인스타그램 스포츠 브랜드 제품에 높은 구매의도를 보였다. 셋째, 인플루언서 유형과 유행혁신성 간의 상호작용 효과는 통계적으로 유의한 것으로 나타났다. 연구결과에 대한 논의와 함께 마케팅 시사점 및 후속 연구기회를 제시하였다. The purpose of this study was to examine the difference in purchase intention depending upon an Instagram influencer type and a level of fashion innovation, and further investigate the interaction effect between the two independent variables on purchase intention. To achieve the aim of this study, undergraduate/graduate students in the metropolitan area having experience with using Instagram were selected as the population of this study. A total of 108 students were conveniently selected and then an online survey was conducted to the sample. For data analyses, frequency analysis, exploratory factor analysis, reliability analysis, independent sample t-test, and two-way ANCOVA were performed through SPSS 23.0 The results of this study were as follows. Firstly, it was found that the review type had a more positive effect on the purchase intention of sports brand products than the cell market type. Secondly, the result indicated that the group with high fashion innovativeness showed a higher purchasing intention than the group with low fashion innovativeness. Thirdly, the interaction effect between influencer type and fashion innovation was found to be statistically significant. Additionally, marketing implications and future research opportunities were suggested based on the results of this study.

다황화암모늄에 의해 제조된 황화니켈을 이용한 리튬전지의 전기 화학적 특성 평가

유호석(HO SUK RYU) 한국수소및신에너지학회 2021 한국수소 및 신에너지학회논문집 Vol.32 No.6

In the case of a metal sulfide electrode, it is used as an anode or cathode active material in a lithium battery. The reason is that the voltage exists between 0.8 and 2.0 V via lithium electrode and the discharge and charge capacity is high. In order to manufacture nickel sulfide for electrode, which are widely used, nano-nickel powder was sulfided using ammonium polysulfide, and single-phase NiS electrodes were manufactured through heat treatment. The prepared NiS electrode had a high initial capacity of 500 mAh/g or more, and was stabilized after 20 cycles to maintain a capacity of 400 mAh/g or more until 100 cycles.

상온형 소듐 금속 또는 소듐 이온 이차전지

유호석(Ho Suk, Ryu) 한국전지학회 2021 한국전지학회지 Vol.1 No.2

소듐은 리튬에 비하여 풍부한 매장량을 가지고 있어 저가이고 다른 전지들에 비하여 산화환원 전압이 -2.71 V로 낮은 편이며 대용량 이차전지의 전극물질로의 가능성을 충분하게 가지고 있다. 초기의 소듐을 이용한 전지는 고온에서 소듐 β""-알루미나(NaAl11O17)을 이용하여 고온형 Na/S전지와 ZEBRA(zero-emission battery research Activities; Na-NiCl₂) 전지 두 가지 타입이 사용되고 있으며 이러한 전지는 300℃ 이상의 고온에서 작동되기 때문에 전극으로 사용되는 소듐과 양극 물질이 용융상태로 작동이 된다. 최근에는 리튬 전지의 대용량화에 따른 높은 가격 등으로 인하여 상온에서도 작동할 수 있는 소듐 전지에 많은 관심을 가지게 되었다. 본 논문은 상온용 소듐 전지에 사용되는 전극과 전해질에 대하여 알아보도록 하겠다. Sodium has abundant reserves compared to lithium, so it is inexpensive and has a low oxidation-reduction voltage of -2.71 V compared to other batteries and has sufficient potential as an electrode material for large-capacity secondary batteries. In the early days of batteries using sodium, two types were used: a high-temperature Na/S battery and a ZEBRA (zero-emission battery research activities; Na-NiCl₂) battery using sodium β""-alumina (NaAl11O17) at high temperature. Because it is operated at a high temperature of 300℃ or higher, sodium used as an electrode and the anode material are operated in a molten state. Recently, due to the high price due to the increase in capacity of lithium batteries, there has been much interest in sodium batteries that can operate at room temperature. In this paper, we will investigate the electrodes and electrolytes used in sodium batteries for room temperature.

스크린야구장 서비스스케이프가 고객감정반응 및 고객참여행동에 미치는 영향

유호석(Yoo, Ho-Suk),한진욱(Han, Jin-Wook),김일수(Kim, Il-Soo) 한국체육과학회 2019 한국체육과학회지 Vol.28 No.3

The purpose of this study was to examine the structural relationship between screen baseball servicescape, customer’s emotional response and customer participation behavior. To achieve this goal, participants who had ever played screen baseball were selected as a study population. A total of 242 participants were conveniently selected from amateur baseball clubs and collegiate students majoring in the physical education related subjects from four university in the metropolitan area. 234 usable data were used data analyses including frequency analysis, reliability analysis, correlation analysis, confirmatory factor analysis, and structural equation modeling with SPSS 23.0. The results of the study indicated that 1) screen baseball servicescape had a significant impact on customer’s emotional response, 2) screen baseball servicescape had a significant effect on customer participation behavior, and 3) customer’s emotional response significantly affected customer participation behavior. Discussions and additional implications were also suggested.

스포츠 브랜드 제품의 네이티브 광고 메시지 유형이 광고태도에 미치는 영향: 자기조절초점 및 매체신뢰도의 조절효과

유호석 ( Ho-suk Yu ),한진욱 ( Jin-wook Han ) 한국체육학회 2020 한국체육학회지 Vol.59 No.2

본 연구의 목적은 스포츠 브랜드 제품의 네이티브 광고 메시지 유형(평가적 메시지/사실적 메시지)이 소비자의 광고태도에 미치는 영향에 있어 자기조절초점(향상초점/예방초점)과 매체신뢰도(고/저)의 조절 효과를 규명하는데 있다. 이러한 연구목적을 달성하기 위해 경기도에 위치한 4개 대학교의 대학(원)생을 비확률표본추출법인 유목적적 표집법으로 278명을 추출하여 스마트폰을 통해 실험 자극물을 제시하고, 온라인 설문조사를 실시하여 총 264부의 유효 표본을 분석에 이용하였다. 자료처리는 SPSS 23.0을 통해 빈도분석, 탐색적 요인분석, 신뢰도 분석, 독립표본 t-검증 및 이원분산분석을 실시하였고, 분석 결과는 다음과 같다. 첫째, 스포츠 브랜드 제품의 평가적 네이티브 광고 메시지 유형이 사실적 네이티브 광고 메시지 유형보다 소비자의 광고태도에 긍정적인 영향을 미치는 것으로 나타났다. 둘째, 스포츠 브랜드 제품의 네이티브 광고메시지 유형이 광고태도에 미치는 영향에 있어 자기조절초점의 조절효과는 유의한 것으로 나타났다. 셋째, 스포츠 브랜드제품의 네이티브 광고 메시지 유형이 광고태도에 미치는 영향에 있어 매체신뢰도의 조절효과는 유의하지 않은 것으로 나타났다. 연구결과에 대한 논의와 함께 마케팅 시사점 및 후속 연구기회를 제시하였다. The purpose of this study was to examine the moderating effect of self-regulating focus(promotion focus/prevention focus) and media credibility(high/low) in the relation between a native advertising message type (evaluative message/factual message) of sports brand products and consumer’s attitude toward advertising. Toward this end, a total of 278 respondents was selected using a purposive sampling method and responded to the online survey questionnaire. 264 usable data were utilized in the data analyses procedure. Data were analyzed using frequency analysis, exploratory factor analysis, reliability analysis, independent sample t-test and two-way ANOVA with SPSS 23.0. program. The results of this study were as follows. Firstly, consumers’ attitude toward an advertising including evaluative messages was higher than their attitude toward an advertising with factual messages. Secondly, there was a moderating effect of self-regulatoring focus in the relation between a native advertising message type (evaluative message/factual message) of sports brand products and consumer’s attitude toward advertising. Thirdly, there was no moderating effect of media credibility in the relation between a native advertising message type (evaluative message/factual message) of sports brand products and consumer’s attitude toward advertising. Discussions and additional implications were also suggested.