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Haeyong Yun,김호찬 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.10
Micro-needles are known as a mean that can minimize pains while it gets through the human skin. And it will be safer if it can be made of biodegradable material. Microstereolithography (MSL) forms a part by the photo-polynerization of liquid resin. And it has production resolution in the range of several tens of micrometers. So it can be used to fabricate precise micro-needle. Actually the MSL technology is frequently applied to various areas such as bioengineering and MEMS devices. This paper shows the framework of a micro-stereolithography apparatus which can fabricate micro-needle by using multiple materials including photocurable biodegradable material like PPF (poly propylene fumarate). And will introduce process parameters for the precise micro-needle fabrication. Finally,verifies the system by showing some examples of the micro-needle with multiple materials including PPF.
Yun Yoojoo,Oh Jinseok,Yi Yoonhyuck,Lee Hyunkyung,Kim Byeongwan,Kang Haeyong 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.81 No.10
We report the electrical transport properties of a dual-gate graphene device placed on a CaF2 substrate. A hexagonal boron nitride top-gate dielectric was introduced to confrm the electrical characteristics of the CaF2/graphene transistor because it is difcult to inject sufcient carriers through the CaF2 substrate owing to its thickness of 500 µm, and the typical ambipolar behavior of graphene with a slight n-doping efect was clearly observed. In addition, we used a polymethyl methacrylate (PMMA) flm as a top-gate dielectric for large-scale graphene devices grown via chemical vapor deposition, which was transferred onto a CaF2 substrate. We controlled the high gate leakage current caused by the breakdown of the polymer due to non-uniformity by applying the flm-transfer process rather than the direct coating method on the graphene device. Furthermore, the transport properties of large-area graphene in contact with CaF2 are discussed with respect to the efect of top-contacted PMMA.
전해용 ( Haeyong Chun ),박세윤 ( Seyun Park ),윤대현 ( Dae-hyun Yun ) 한국스포츠심리학회 2021 한국스포츠심리학회지 Vol.32 No.2
목적: 본 연구는 성인 운동선수가 시합 전·중·후 상황에서 경험하는 긍정적·부정적 정서를 조절하는 방법을 탐색적으로 살펴보고자 하였다. 방법: 운동종목을 개인/직접, 개인/평행, 단체/직접, 단체/평행 등으로 구분하여 면담과 개방형 질문을 실시하였다. 면담에는 성인 운동선수 12명이 참가하였으며, 171명을 대상으로 개방형 질문을 실시하였다. 면담과 개방형 질문 내용을 토대로 귀납적 내용분석을 실시하였다. 결과: 귀납적 내용분석 결과 3,182개의 원자료를 추출하였으며, 이를 ‘긍정적 상황의 인지적 전략’ 6개 요인, ‘긍정적 상황의 행동적 전략’ 9개 요인, ‘부정적 상황의 인지적 전략’ 7개 요인, ‘부정적 상황의 행동적 전략’ 11개 요인으로 최종 범주화였다. 결론: 본 연구결과 성인 운동선수로부터 정서조절이 최적의 수행을 위해 중요한 요소임을 확인할 수 있었다. 또한, 다양한 상황에서 선수들이 정서를 조절하기 위해 사용하는 인지적·행동적 전략들을 탐색할 수 있었다. Purpose: This study inductively explored how adult athletes regulate their emotion that they experienced in various situations. This study divided the situations into three parts; ‘before a game’, ‘in the middle of a game’, and ‘after a game’. Methods: In order to investigate emotional regulation factors, this study had a semi-structured interview with 12 adult athletes. Besides, 171 adult athletes participated in the open-ended questionnaire that inquired how to regulate their emotions in various situations related to a game. Based on the responses from the interview and the open-ended questionnaire, the expert group analyzed the contents inductively. Results: In the result of inductive contents analysis, 3,182 raw data were extracted. The expert group categorized these data into cognitive and behavioral strategies depend on positive and negative situations - [Cognitive Strategy of Positive Situation] 6factors, [Active Strategy of Positive Situation] 9factors, [Cognitive Strategy of Negative Situation] 7factors, [Active Strategy of Negative Situation] 11factors. Conclusion: Consequently, this study confirmed that emotional regulation was a significant factor for adult athletes’ optimal performance. Also, it was possible to explore the cognitive and behavioral strategies that athletes use to regulate emotions from various situations.