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증착 중 자외광 노광에 의한 산화 아연 박막의 특성 변화
김보석,백승재,Kim, Bo-Seok,Baik, Seung Jae 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.4
ZnO thin films have wide application areas due to its versatile properties as transparent conductors, wide-bandgap n-type semiconductors, gas sensor materials, and etc. We have performed a systematic investigation on ultraviolet-assisted CVD (chemical vapor deposition) method. Ultraviolet irradiation during the deposition of ZnO causes chemical reduction on the growing surface; which results in the reduction of the deposition rate, increase in the surface roughness, and decrease of the electrical resistivity. These effects produce larger characteristic variation with various deposition conditions in terms of surface morphology and optical/electrical properties compared to normal CVD deposited ZnO thin films. This versatile controllability of ultraviolet-assisted CVD can provide a larger processing options in the fabrication of nano-structured materials and flexible device applications.
컨벡스 최적화 기반의 가변유동형 덕티드 로켓 유도탄의 중기궤적 최적화 연구
김보석,정철구,이용건,성홍계,이창훈 제어·로봇·시스템학회 2023 제어·로봇·시스템학회 논문지 Vol.29 No.8
This paper presents a convex optimization-based trajectory optimization method for variable-flow ducted rocket missiles during midcourse engagement to reach the predicted intercept point (PIP). The minimum-intercept time problem is established by reflecting the dynamics and some flight constraints for ducted rocket missiles. An artificial neural network (ANN) is utilized to approximate the nonlinear relationship between several flight conditions and the performance of ducted rockets. In addition, this study, unlike previous studies, proposes selecting the air-to-fuel ratio instead of the fuel mass-flow rate as a control input. This can alter the nonlinear constraint as an equivalent linear constraint by combining it with the pseudospectral method, which is demonstrated in this paper. A convex sub-problem is established by applying successive linearization to the nonlinear dynamic constraint. An improved trust-region algorithm is utilized with the convex sub-problem to solve the original non-convex problem. Numerical optimization results are provided to demonstrate the performance of the proposed method and investigate the optimal trajectory for variable-flow ducted rocket missiles.
메가스포츠이벤트 후원 기업의 스폰서십 활동이 브랜드자산 및 구매의도에 미치는 영향
김보석,명왕성 한국관광진흥학회 2024 관광진흥연구 Vol.12 No.S2
본 연구는 메가스포츠이벤트 공식후원사의 스폰서십 활동이 기업의 브랜드자산 및 구매의도에 미치는 영향을 규명하는데 그 목적이 있다. 이를 위해 관련 변인들에 관한 문헌을 검토하고, 변인 간 관계를 살펴보기위해 실증적 연구를 실시하였다. 그 결과 첫째, 공식후원사의 스폰서십 활동 중 커뮤니케이션 활동은 브랜드인지도에 부적(-) 영향을, 이미지제고 활동과 이벤트기여 활동은 정적(+) 영향을 미쳤다. 둘째, 커뮤니케이션활동은 브랜드이미지에 부적(-) 영향을, 이미지제고 활동과 이벤트기여 활동은 정적(+) 영향을 미쳤다. 셋째, 커뮤니케이션 활동은 브랜드충성도에 부적(-) 영향을, 이미지제고 활동과 이벤트기여 활동은 정적(+) 영향을미쳤다. 넷째, 브랜드자산이 구매의도에 미치는 영향은 브랜드충성도만 정적(+) 영향을 미쳤다. 다섯째, 이미지제고 활동과 이벤트기여 활동이 구매의도에 정적(+) 영향을 미치는 것으로 밝혀졌다. 결론적으로 메가스포츠이벤트 공식후원사의 스폰서십 활동이 브랜드자산 및 구매의도에 미치는 영향은 긍정적인 것으로 볼 수있다. 다만, 스폰서십 활동 중 일부 부적 영향을 미친 요인에 대해서는 후속적인 논의가 필요해 보인다. The purpose of this study is to investigate the effects of sponsorship activities by official sponsors of mega sports events on brand equity and purchase intention. We reviewed the literature on related variables and conducted empirical study to examine the relationships between variables. As a result, first, image enhancement activity and event contribution activity had a positive effect on brand awareness. Second, image enhancement activity and event contribution activity had a positive effect on brand image. Third, image enhancement activity and event contribution activity had a positive effect on brand loyalty. Fourth, the effect of brand equity on purchase intention was only positive on brand loyalty. Fifth, image enhancement activity and event contribution activity had a positive effect on purchase intention. In conclusion, sponsorship had a positive effect on brand equity and purchase intention. However, it seems necessary to follow up on the dependent factors that had a negative impact on some of the sponsorship activities.