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박현규(Hyungyu Park),한지희(Jihee Han),서윤호(Yoonho Seo) 대한산업공학회 2020 대한산업공학회지 Vol.46 No.5
In ocean environment, mechanism that successfully avoids the typhoon is required for path planning in ocean environments as the typhoon usually changes its location over time and affect the safety of ocean vehicles. Hence, we propose a method that efficiently generates a feasible path in a dynamic environment based on the expected paths of both typhoon and ship over time. This minimizes the length of the final path and the CPU runtime by regenerating the path from the starting point after the arc of the ship colliding with the trajectory of a typhoon was removed from the network. In simulation, the proposed method was compared with several approaches that have been applied for obstacle avoidance in dynamic environment. As a result, it was found that the proposed method was effective in reducing the path length and CPU runtime.
비대칭 망에서 세그먼트 크기 조정을 통한 상향 링크의 혼잡 제어
박현규(Hyungyu Park),제정광(Jungkwang Je),안준철(Joonchul Ahn),임경식(Kyungshik Lim) 한국정보과학회 2005 한국정보과학회 학술발표논문집 Vol.32 No.1
상향 링크와 하향 링크의 대역폭이 다른 비대칭 망 환경에서 범용 TCP를 사용하는 경우, 상향 링크의 혼잡으로 인해 TCP의 성능이 저하되는 문제점이 있다. 본 논문에서는 이러한 문제점을 개선하기 위하여 하향 링크에서 데이터 세그먼트의 크기를 조정하여 상향 링크의 혼잡을 완화시키는 방법을 제안한다. 이 방법은 단대단 의미구조를 유지하면서 망의 상태에 따라 세그먼트의 크기를 최적으로 조절하여 응답 패킷을 최소한으로 생성하도록 하는 특징을 가지고 있다. 특히, 조정된 크기를 갖는 세그먼트가 전송 도중에 오류가 발생하는 경우에 빠른 복구를 위해 SACK를 사용한다. 또한, 혼잡 제어 구간에서는 세그먼트의 크기를 조절하지 않도록 하여 줄어든 응답 패킷의 수로 인한 성능 감소를 방지한다.
과리튬 층상 산화물 양극재의 성능 향상을 위한 도펀트의 전산 스크리닝
강승표(Seungpyo Kang),박현규(Hyungyu Park),정진영(Jinyoung Jeong),박태현(Taehyun Park),나성민(Sungmin Na),안현진(Hyunjin An),박광진(Kwangjin Park),민경민(Kyoungmin Min) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
Over-lithiated layered oxide (OLO) enables enhanced specific capacity with additional Li-ion in the transition metal. Nevertheless, extreme delithiation causes reversible oxygen redox and structural modifications, resulting in undesirable potential and capacity losses during charge/discharge cycles. To solve this problem, a doping strategy was used. Computational screening based on first-principles calculations was performed to select the ideal dopant. Li₁ ₄Ni₀ <SUB>25</SUB>Co₀ ₁Mn0 <SUB>65</SUB>O₂ ₄ is used to confirm the improvement in structural and electrochemical performance of the considered dopants. During screening, the criteria of formation energy and volume change are considered. Among the initial 29 candidates, 21 dopants can improve the electrochemical performance of the pristine structure. The top five candidates are Sr, Ba, Ca, Rh, and Ta. This research can accelerate development of stable and high-performance cathode for lithium-ion batteries.
Ag 도핑 TiO<sub>2</sub>와 실란 고분자를 이용한 셀프클리닝 섬유의 제조
곽정미,문예진,박강림,박민지,박현규,배진석,Jeongmi Kwak,Yejin Mun,Gangrim Park,Minji Park,Hyungyu Park,Jin-Seok Bae 한국섬유공학회 2024 한국섬유공학회지 Vol.61 No.3
In this study, visible light responded photo catalysts and silane polymers were applied to PET fabrics to occur photoreaction and super hydrophobic property. First, TiO<sub>2</sub> doped with Ag metal ions was prepared, and the Ag-doped TiO<sub>2</sub> was combined with AgI, WO<sub>3</sub>, and ZnO photocatalysts. Because photodegradation properties are improved by complexing photocatalysts. And they were treated on PET fabrics to occur a self-cleaning function. Ag ions reduce the bandgap energy of TiO<sub>2</sub> so that it exhibits excellent photodegradation under visible light. In addition, WO<sub>3</sub>, ZnO, and AgI have improved electron mobility through synergy with Ag ions present in the metal-doped photocatalyst. In addition, by applying a silane polymer to PET fabrics, super hydrophobic properties are realized on the surface of fiber. SEM, EDS, and XRD were used to evaluate the properties and performance of the visible light responsive photocatalysts. Contact angles were measured to evaluate the properties of the silane-treated fabric surface. As a result, PET fabric realizes excellent initial photodecomposition rate that decompose more than 90% of Methylene blue in 4 hours, and super hydrophobic property of contact angle 165 °. If there are further studies, the possibility of self-cleaning functional fibers will be high.
Fabrication and optimization of rare earth iron garnet using Metal organic decomposition method
Hyeongyu Kim,Phuoc-Cao Van,Hyeonjeong Jung,Jiseok Yang,Trinh Nguyen Thi,Duc Duong Viet,Sang J. Park,Jungjae Park,Albert M. Park,Seung-Young Park,Younghun Jo,Jong Min Yuk,Hyungyu Jin,Jung-woo Yoo,Jong- 한국자기학회 2023 한국자기학회 학술연구발표회 논문개요집 Vol.33 No.1