A5020110641- Wave and Wind Energy Systems
- Coastal and Marine Dynamics
- Fluid Dynamics and Vibration Analysis
- Wind Energy Research and Development
- Microfluidic and Capillary Electrophoresis Applications
- Microfluidic and Bio-sensing Technologies
- Fluid Dynamics Simulations and Interactions
- 3D Printing in Biomedical Research
- Earthquake and Tsunami Effects
- Micro and Nano Robotics
- Ship Hydrodynamics and Maneuverability
- Radio Frequency Integrated Circuit Design
- Ocean Waves and Remote Sensing
- Offshore Engineering and Technologies
- Engineering Applied Research
- Maritime Transport Emissions and Efficiency
- Advanced optical system design
- Aerospace Engineering and Energy Systems
- Advanced MEMS and NEMS Technologies
- Hydrogels: synthesis, properties, applications
- Nanofabrication and Lithography Techniques
- Carbon Nanotubes in Composites
- Acoustic Wave Resonator Technologies
- Thermodynamic and Exergetic Analyses of Power and Cooling Systems
- Nanotechnology research and applications
Korea Research Institute of Ships and Ocean Engineering
2015-2023
Korea Institute of Ocean Science and Technology
2023
Samsung (South Korea)
2021
Global Core Research Center for Ships and Offshore Plants
2016-2018
Korean Register (South Korea)
2018
University of New Mexico
2018
Seoul National University
2004-2009
This paper presents a novel highly efficient passive micromixer that employs diffusion for micromixing. Since conventional fabrication methods cannot form precise aligned microchannels, the realization of complex 3D has been difficult. Here, we report micromixer, named chessboard mixer. In addition, new polydimethylsiloxane (PDMS) bonding method was developed to produce proposed The PDMS technique requires PDMS-to-PDMS and moldable flexibility partially cured structure. Accordingly, two-step...
The International Energy Agency Technology Collaboration Programme for Ocean Systems (OES) initiated the OES Wave Conversion Modelling Task, which focused on verification and validation of numerical models simulating wave energy converters (WECs). long-term goal is to assess accuracy establish confidence in use used design as well power performance assessment WECs. To this confidence, authors different existing computational modelling tools simulate given tasks identify uncertainties related...
This paper reports on an ongoing international effort to establish guidelines for numerical modeling of wave energy converters, initiated by the International Energy Agency Technology Collaboration Program Ocean Systems. Initial results point absorbers were presented in previous work, and here we present a breakwater-mounted Oscillating Water Column (OWC) device. The experimental model is at scale 1:4 relative full-scale installation water depth 12.8 m. power-extracting air turbine modeled...
In this study, a time-domain numerical method based on three-dimensional potential flow was developed to analyze the hydrodynamic characteristics of an inclined oscillating-water-column (OWC) wave energy converter (WEC). A finite element applied solve around and inside OWC chamber. turbine–chamber interaction considered take into account pressure drop chamber, which is nonlinear function airflow speed via turbine operation. The instantaneous updated free-surface boundary condition chamber in...
For the first time in industry, 18nm FDSOI technology platform meeting performance target for next MCU is presented based on triple gate oxide and HKMG process. To meet of MCU, continuous-active device width increase by "contact over active" with wide process margin are utilized. Good yield 64Mb SRAM array all bitcells (bitcell area 0.102um <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> 0.124um ultra low leakage high speed,...
In laser-induced fluorescence (LIF) detection, the focusing of excitation laser beam into a focal point channel in microfluidic chip is important to obtain largest intensity, and consequently emitted light collected photodetector with high efficiency. this paper, we present poly(dimethylsiloxane) (PDMS) consisting an integrated PDMS microlens. The microlens was fabricated by photoresist reflow replica molding method. This fabrication technique simple has good property terms high-dimensional...
본 연구에서는 부유식 파력-해상풍력 연계형 발전시스템의 기반구조물 개념설계에 대한 내용을 다루고 있다. 세계적으로 해양 신재생에너지에 관심이 커져가고 파력과 해상풍력은 다른 해양에너지원과 더불어 주요 되는 에너지원으로서 발전적지가 대체로 일치한다는 특징이 따라서 해상풍력을 복합하여 발전하는 시스템은 경제적으로 많은 이점이 있고 이미 여러 나라에서 복합발전 시스템을 개발하고 이에 따라 우리나라에서도 10MW급의 개발하기 위한 연구가 수행되었다. 다수 풍력 발전기와 파력발전기의 배치를 고려하여 반잠수식 구조물이 설계되었다. 또한 설치해역의 환경을 계류시스템과 파워케이블이 논문에서는 이러한 플랫폼의 개념설계 결과를 제시하고 다양한 고려한 설계상의 어려움을 토의하고 설계 방법을 제시한다.
본 연구에서는 대형 부유식 파력-해상풍력 복합발전 구조물의 극한환경 운동 성능에 관한 실험적 연구를 다루고 있다. 구조물에 대한 성능을 평가하기 위하여 1/50 축척비의 모형을 제작하였다. 그리고 설계된 계류선의 사양에 부합하는 계류선 제작하였고 자유감쇠시험 및 static pull-out 시험을 통하여 검증하였다. 주어진 수심을 만족하기 테이블을 도입하고 환경조건에 계류판에 따른 환경조건을 확인하였다. 모형시험에서 규칙파 중 운동응답을 확인하고 파랑, 조류, 바람의 복합환경 하중을 적용하여 운동성능을 해석하였다. 최대 및, 가속도를 계측하여 안전성을 판단하였고 변위와 계류 하중도 선급기준에 따라 판단하였다. 이로부터 특성에 대하여 토의하였다.
In this work, the effects of metal dimension and substrates on characteristics MEMS inductors have been studied. The suspended spiral were fabricated by technologies with microelectroplating thick film photolithography. 20 µm over substrate to reduce coupling loss designed a 10 layer ohmic loss. We also characterized properties according substrates, size gap between inductor lines width lines. measured quality factor silicon was at 2 GHz. various such as high resistive silicon, glass quartz...
A numerical study was performed to investigate the applicability of linear decomposition method for hydrodynamic energy conversion an oscillating-water-column type wave converter (OWC-WEC). Hydrodynamic problems OWC chamber were decomposed into excitation and radiation with time-domain based on potential theory. finite element applied solve flow in entire fluid domain including structure. The validity examined by comparing direct interaction turbine–chamber pressure drop characteristics. In...
This study considers the motion responses of heaving point absorbers (HPAs) connected to large semi-submersibles. To analyze for HPAs, a response amplitude operator (RAO) single HPA fixed wall was obtained in two-dimensional wave flume. A frequency-domain eigenvalue analysis is used evaluate RAO HPA, and experimental numerical results were compared. model test conducted motions multiple HPAs semi-submersible 3D ocean basin. The RAOs compared with wall.
The present study deals with the conceptual design of a motion reduction device for floating wave-offshore wind hybrid power generation platform. A damping plate attached to bottom column large semi-submersible is introduced reduce Performance analyses on various shapes and configurations plates were performed using potential flow solver, appropriate configuration size selected based numerical results. In order see effect viscous damping, small scale model test was in 2D wave flume....
본 연구에서는 방파제 연계 진동수주형 파력발전장치의 경사형 진동수주실 성능해석에 대해 다룬다. 먼저, 터빈효과가 고려되지 않은 열린 진동수주실에 대하여 Star-CCM+를 이용한 전산유체역학 방법으로 다양한 주기의 규칙파를 조파시켜 내부에 형성되는 수위 변화를 해석하였으며, 해당 값을 선행연구의 2차원 조파수조 모형시험 결과와 비교하여 해석 방법의 신뢰도를 검증하였다. 다음으로, 터빈효과를 오리피스로 모델링한 규칙파 해석을 수행하였으며, 내부 수위변화, 오리피스 전후간 차압력, 오리피스를 지나는 유속 시계열을 도출하여 진동수주실의 1차 에너지변환 특성을 분석하였다. 또한, 모델링에 대한 CFD 해석은 정도를 부분적으로 연구를 통해 타당성을 보였다.
Abstract In the present study, primary energy conversion performance of an oscillating water column (OWC) was evaluated through experimental tests and numerical simulations. The were performed at ocean basin located in Korea Research Institute Ships Ocean Engineering (KRISO), Korea. A 1/4 scaled OWC chamber model with orifice to account for turbine effect set up 3-dimensional basin, regular wave various incident periods. surface level inside chamber, differential pressure between before...