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지르코니아 나노입자 기반 나노패턴 금속 몰드 제작과 열가소성 재료의 복제성형 응용
박세림,민경찬,장소원,하유진,김욱배 한국정밀공학회 2022 한국정밀공학회지 Vol.39 No.7
Fabrication of a durable and strong nanopatterned mold insert using metal sheet and plate is important for molding of thermoplastic materials. Conventionally, the nickel stamper replicating a master pattern by electroforming process hasbeen used for injection molding of nanotextured products such as Blu-ray media. However, a more facile and cheaper mold fabrication process is highly required for manufacturing of functional products based on nanostructured surface. In this study, zirconia nanoparticles were blended with UV curing polymer to fabricate a polymer nanocompositebased nanopattern mold. Compared to the cured pure Ormostamp, the modulus of elasticity of the nanocomposite filled with approximately 54 vol% of zirconia nanoparticles increased by 160 times. Additionally, the modulus of elasticity reached 197 GPa by thermal decomposition of the UV-Cured polymer and post-annealing at 800°C of the nanoparticle layer. The nanopatterns were formed on stainless steel sheet and block, and applied to hot embossing of the PMMA films and injection molding of the COC materials, respectively. No deterioration of the mold occurred during the hot embossing 30 times and the injection molding 600 shots. Nanoparticle-enhanced UV curing nanocomposites or post-heat treatment methods are cost-efficient and easy, because many molds can be manufactured from one master pattern.
고유전율 필드 플레이트를 적용한 β-Ga2O3 쇼트키 장벽 다이오드
박세림,이태희,김희철,김민영,문수영,이희재,변동욱,이건희,구상모 한국전기전자재료학회 2023 전기전자재료학회논문지 Vol.36 No.3
In this paper, we discussed the effect of field plate dielectric materials such as silicon dioxide (SiO2), aluminum oxide (Al2O3), and hafnium oxide (HfO2) on the breakdown characteristics of β-Ga2O3 Schottky barrier diodes (SBDs). The breakdown voltage (BV) of the SBDs with a field plate was higher than that of SBDs without a field plate. The higher dielectric constant of HfO2 contributed to the superior reduction in electric field concentration at the Schottky junction edge from 5.4 to 2.4 MV/cm. The SBDs with HfO2 field plate showed the highest BV of 720 V, and constant specific on-resistance (Ron,sp) of 5.6 mΩ·cm2, resulting in the highest Baliga’s figure-of-merit (BFOM) of 92.0 MW/cm2. We also investigated the effect of dielectric thickness and field plate length on BV.
확장된 계획행동이론을 통한 애슬레저 의류 구매결정요인에 관한 연구
박세림(Park, Se-rim),양도업(Yang, Do-eob),배상우(Bae, Sang-woo) 한국사회체육학회 2021 한국사회체육학회지 Vol.- No.85
Purpose: The purpose of this study is to find determinants of consumer’s decision to purchase athleisure-wear. To do so, the study applied the extended theory of planned behavior. Method: The subjects of this study were 244 people purchasing athleisure-wear. This study used exploratory factor analysis, reliability analysis, frequency analysis, correlation analysis and multiple regression analysis. Results: The results of this study are as follows. 1) Hypothesis 1, there was a structural relationship between attitude towards athleisure-wear and purchase intention. 2) Hypothesis 2 and 3 were rejected. 3) Hypothesis 4, there was a structural relationship between consumer lifestyle and attitude towards athleisure-wear. 4) Hypothesis 5, there was a structural relationship between past purchase behavior and attitude towards athleisure-wear. Conclusion: In summary, the findings in this study confirm that key factors influence the purchase intention of athleisure-wear. Therefore, Based on these key factors, marketing for consumers who purchase athleisure-wear needs to be considered.
스포츠구단의 학교 밖 청소년에 대한 사회공헌활동 발전 방향
박세림(Park, Serim),임승엽(Lim, Seungyup) 한국스포츠사회학회 2021 한국스포츠사회학회지 Vol.34 No.2
본 연구의 목적은 스포츠구단의 학교 밖 청소년에 대한 사회공헌활동 발전방향을 탐색하는 데 있다. 이에 본 연구에서는 학교 밖 청소년을 대상으로 한 스포츠구단의 사회공헌활동의 현황과 발전방향에 대해 청소년 전문 지도자들의 인식을 통해 탐색하고자 하였다. 이를 위하여 본 연구에서는 준거적 선택법을 활용하여 학교 밖 청소년 전문가 5명과의 면담을 진행하였다. 수집된 자료는 분류체제분석방법과 내용분석법을 활용하여 분석되었으며 다음과 같은 연구결과를 도출하였다. 첫째, 학교 밖 청소년들은 학교생활 중단 이후 시간관리의 어려움과 사회적 낙인현상에 시달리고 있으며, 이 때문에 우울증, 무기력, 심지어 일탈행동 등의 사회·심리적 어려움을 경험하고 있다. 둘째, 학교 밖 청소년에 대한 지원현황에 관해 공적 지원의 경우 만족스러운 수준이지만, 제한적인 지원 혜택의 적용과 지원사업의 성과가 미흡하여 취업, 진학, 학업복귀 등으로의 연계가 한계를 보이고 있다. 민간 수준의 지원에 대해 관심이 부족하거나 일회성에 그치고 있는 점이 문제점으로 발견되었다. 셋째, 학교 밖 청소년을 위한 스포츠구단의 사회공헌활동 발전방향으로서 1) 지원 대상의 욕구를 반영한 지원, 2) 장기적 지원 프로그램 제공, 3) 스포츠 스타를 활용한 프로그램 확대, 4) 사회적 거리감 최소화를 위한 단계적 프로그램 제공 등이 제시되었다. 이러한 노력을 통해 스포츠구단은 학교 밖 청소년이 학교생활 중단 이후 겪는 어려움을 극복할 수 있도록 사회공헌활동에 보다 많은 관심을 유도하고 그 방향을 제시함으로써 학교 밖 청소년들에게 실질적인 도움이 되는 스포츠구단의 사회공헌활동이 될 수 있는 자료로 활용되기를 기대한다. The purpose of the study was to explore the current status of sports teams’ social responsibility activities and to provide developmental directions. In particular, this study was intended to explore the social responsibility activities of sports teams targeting out-of-school youth through the perception of youth professional counselors. To this end, this study conducted interviews with five out-of-school youth experts. The collected data were analyzed using the classification system analysis method and the content analysis method, and the following research results were derived. First, adolescents outside of school are suffering from difficulties in time management and social stigma after the interruption of school life, and for this reason, they experience social and psychological difficulties such as depression, lethargy, and even deviant behavior. Second, regarding the status of support for out-of-school youth, public support is at a satisfactory level, but the application of limited support benefits and the results of the support project are insufficient, so the connection to employment, going on to school, and returning to school is showing limitations. The problem was pointed out that there was a lack of interest in the private level support or it was only one-off. Third, as a plan for social responsibility activities of sports teams for out-of-school youth, 1) support reflecting the needs of the targets, 2) provide long-term support programs, 3) expand programs using sports stars, and 4) minimize social distancing by step-by-step programs were recommended.