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.

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.

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.

기업 규제의 다층적 효과 연구 : 공공 소프트웨어 사업 대기업참여제한제도를 중심으로

유호석(Hoseok Yoo),박강민(Gangmin Park),김준연(Jounyoun Kim),이삼열(Samyoul Lee) 한국IT서비스학회 2019 한국IT서비스학회지 Vol.18 No.4

This article analyzes the effects of regulation that restrict the conglomerate firms to participate in the public procurement of software. The regulation was implemented in 2013, and this article analyzes five years of firm performance before and after 2013 through DID (difference-in-difference method). In particular, this article analyzes how restrictions on conglomerate firms participation in public software procurement affect middle and small firms performance. As a result, small-size firms achieve relatively positive results in private sector revenues compared to mid-size firms. However, there was no significant difference between the mid-size and small-size firms in profit margin. This study implies that the new policy is needed to improve the small and medium-size firms revenues on the private market by leveraging the public procurement market which restricted the conglomerate firms to participate. This can be done by complementing the regulation in line with servitization paradigm.

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.

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

금속산화물 복합분말의 동결건조 및 수소분위기 환원처리에 의한 Cu-Sn 다공체 제조

김민성,유호석,오승탁,현창용,Kim, Min-Sung,Yoo, Ho-Suk,Oh, Sung-Tag,Hyun, Chang-Yong 한국재료학회 2013 한국재료학회지 Vol.23 No.12

Freeze drying of a porous Cu-Sn alloy with unidirectionally aligned pore channels was accomplished by using a composite powder of CuO-$SnO_2$ and camphene. Camphene slurries with CuO-$SnO_2$ content of 3, 5 and 10 vol% were prepared by mixing with a small amount of dispersant at $50^{\circ}C$. Freezing of a slurry was done at $-25^{\circ}C$ while the growth direction of the camphene was unidirectionally controlled. Pores were generated subsequently by sublimation of the camphene during drying in air for 48 h. The green bodies were hydrogen-reduced at $650^{\circ}C$ and then were sintered at $650^{\circ}C$ and $750^{\circ}C$ for 1 h. XRD analysis revealed that the CuO-$SnO_2$ powder was completely converted to Cu-Sn alloy without any reaction phases. The sintered samples showed large pores with an average size of above $100{\mu}m$ which were aligned parallel to the camphene growth direction. Also, the internal walls of the large pores had relatively small pores. The size of the large pores decreased with increasing CuO-$SnO_2$ content due to the change of the degree of powder rearrangement in the slurry. The size of the small pores decreased with increase of the sintering temperature from $650^{\circ}C$ to $750^{\circ}C$, while that of the large pores was unchanged. These results suggest that a porous alloy body with aligned large pores can be fabricated by a freeze-drying and hydrogen reduction process using oxide powders.

OTT 스포츠 콘텐츠 몰입이 PPL 광고효과에 미치는 영향 : 인지욕구 및 관여도의 조절효과

정해용(Jung, Hae-Yong),유호석(Yoo, Ho-Suk),한진욱(Han, Jin-Wook) 한국체육과학회 2021 한국체육과학회지 Vol.30 No.5

The purposes of this study was to examine the impact of engagement in an OTT sport program on advertising effectiveness and determine if there is a moderating effect of need for cognition and involvement in the relation between engagement in an OTT sport program and advertising effectiveness. In order to achieve study objective, a total of 256 undergraduate and graduate students enrolled in metropolitan area was selected using convenient sampling method and responded to the survey questionnaire. Data analyses included frequency analysis, exploratory factor analysis, reliability analysis, descriptive analysis, correlation analysis, two-way MANOVA, two-way ANOVA and independent sample t-test with SPSS 23.0 and AMOS 22.0. The results of this study were as follows. Firstly, engagement in OTT sport program had a significant effect on advertising effectiveness, however, engagement did not affect advertising recognition. Secondly, there was no moderating effect of need for cognition in the relation between engagement in OTT sports program and advertising attitude and advertising recognition. Thirdly, there was no moderating effect of involvement in sports in the relation between engagement in OTT sports program and advertising attitude and advertising recognition. Additionally, managerial implications and future research opportunities were also suggested.

장애물을 고려한 클럭 트리 토폴로지 방법론 분석

송인아(Song In Ah),유호석(Yoo Ho Suk),김주호(Kim Ju Ho) 한국정보과학회 2018 한국정보과학회 학술발표논문집 Vol.2018 No.12