A5077329486- Nonlocal and gradient elasticity in micro/nano structures
- Fluid Dynamics Simulations and Interactions
- Structural Analysis and Optimization
- Composite Structure Analysis and Optimization
- Marine and Coastal Research
- Mechanical stress and fatigue analysis
- Educational Systems and Policies
- Advanced Materials and Mechanics
- Force Microscopy Techniques and Applications
- Graphene research and applications
- Wireless Communication Networks Research
- Adhesion, Friction, and Surface Interactions
- Injection Molding Process and Properties
- Particle Dynamics in Fluid Flows
- NF-κB Signaling Pathways
- Advanced Wireless Network Optimization
- Radio Wave Propagation Studies
- Advanced Memory and Neural Computing
- Advanced MIMO Systems Optimization
- Composite Material Mechanics
- Numerical methods in engineering
- Heat Transfer and Boiling Studies
- Precipitation Measurement and Analysis
- Ferroelectric and Piezoelectric Materials
- Structural Response to Dynamic Loads
Korea Maritime and Ocean University
2021-2023
Korea Advanced Institute of Science and Technology
2017-2019
Agency for Defense Development
2019
University of California, Los Angeles
2008
Mobile defects in solid-state materials play a significant role memristive switching and energy-efficient neuromorphic computation. Techniques for confining manipulating point may have great promise low-dimensional memories. Here, we report the spontaneous gathering of oxygen vacancies at strain-relaxed crack walls SrTiO3 thin films grown on DyScO3 substrates as result flexoelectricity. We found that electronic conductance was enhanced compared to crack-free region, by factor 104. A...
Abstract A numerical formulation coupling finite and boundary element methods is developed to analyze the mechanical deformation electric polarization of flexoelectric solids experiencing geometrically nonlinear deformation. The proposed method considers electrical interactions among solids, charges, their surrounding medium. First, a higher-order gradient theory based on skew-symmetric couple-stress model solids. This includes total Lagrangian weak form that satisfies linear momentum...
Buckling of multilayer graphene sheets (MLGSs) subjected to an axial compressive load in plane-strain condition is studied. Closed-form solutions for buckling MLGSs are obtained based on a continuum model MLGSs. Two different kinematic assumptions, which lead MLGS beam, was recently proposed by the authors, and Euler used obtain loads. The yield significantly loads when length small. To validate results, molecular dynamics (MD) simulations conducted, they show that beam well captures...
Chaff is a passive jammer widely used to disrupt radar or radio-frequency sensors. A mass of chaff fibers dispersed in the air commonly referred as cloud. It nearly impossible numerically simulate real-time enormous amount composing In this paper, we model behavior estimated clouds probability density functions (PDFs) and apply approximation techniques estimate cross-section (RCS) cloud real time. To aerodynamics cloud, represented combination PDFs time wind speed. The applied...
Optimization method of the HSDPA network in cell-overlaid area is developed. The performance index such as throughput measured with various cases, moving case and fixed case. handover parameters affect user differently user's environment. In order to optimize these different users' are analyzed. optimized good for both users
Warships widely spread numerous chaffs using a blast, which form chaff clouds that create false radar cross-sections to deceive enemy radars. In this study, we established numerical framework based on one-way coupling of computational fluid dynamics and discrete element method simulate the spatiotemporal distribution for warships in air. Using framework, investigated effects wind, initial cartridge angle, blast pressure clouds. We observed three phases cloud diffusion: radial diffusion by...
본 연구는 해양경찰의 재난안전문화 수준에 대한 실증적 평가를 통해 재난안전사고 발생 가능성을 논리적으로 예측할 수 있는 하위 차원을 도출하고 재난안전문화를 강화할 방안을 모색하는데 목적이 있다. 이를 위해 전국 해양경찰관 1,047명을 무선표집하여 연구를 실시하였다. 연구결과는 첫째, 전체적인 평가는 조직적 요인 및 환경적 요인에 비해 개인적 요인이 상대적으로 높게 나타났으며, 둘째, 요인의 수준에서는 안전지식이 낮게 나타났다. 셋째, 안전리더십이 넷째, 안전정책에 관한 항목이 연구결과를 토대로 안전행동을 상시적으로 평가할 시스템 구축, 안전조치에 관련된 상벌체계 도입, 위반행동의 위험성 교육 등 관련 정책의 개선과 중간관리자 리더십교육, 조직구성원 상·하급자간 재난안전문화에 공감대 형성을 강화하는 프로그램 도입을 제시하였다. 또한 후속연구에서는 객관적으로 측정할 평가지표 개발과 수준에서 평가된 정책을 제시할 필요가