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The Development of the Foundation of Offshore Wind Turbines
박현철,Shi,Wei,Hyunchul Park 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.10
Offshore wind farms will contribute significantly to the renewable generation of electricity for the world. The economic development of wind farms depends, however, on development of efficient solutions to a number of technical issues, one of these being the foundations for the offshore turbines. We review here the results of recent research for wind turbine foundations. Also it is a short overview of some of the challenges facing the growth of offshore wind energy foundation technology.
박현철(Hyunchul Park) Korean Society for Precision Engineering 2016 한국정밀공학회지 Vol.33 No.7
In this paper, an energy harvester is developed that has advantages regarding piezoelectric noise minimization, mass production, and an easily available environmental energy source, electromagnetic induction, as well as low-frequency bandwidth and high amplitude. A process for fabricating a three-dimensional multilayered planar coil using micro-electro-mechanical systems (MEMS) on a flexible printed circuit board FPCB is introduced. Optimal shape and size were calculated via internal resistance and inductance, and a prototype was fabricated through the MEMS procedure while considering the possibility of mass production. Although the internal resistance matched the designed value, the electromotive force generated did not reach the intended amount. The main reason for the decrease in efficiency was the low area of coil outskirt exposed to the magnetic field while there was relative motion between the magnet and the coil.
다중-채널 및 다중-웨이 반도체 디스크를 위한 플래시 변환 계층
박현철(Hyunchul Park),신동군(Dongkun Shin) 한국정보과학회 2009 정보과학회 컴퓨팅의 실제 논문지 Vol.15 No.9
플래시 메모리는 전력 소비가 적고 처리속도가 빨라 임베디드 시스템의 저장 매체로서 많은 연구가 이루어져왔다. 특히, 최근에는 플래시메모리로 구성된 반도체 디스크(Solid state disk, SSD)가 하드디스크를 점점 대체하고 있는 추세이다. 현재 SSD는 성능을 높이기 위해서 병렬성을 이용한 다중채널과 다중웨이를 사용하고 있다. 이 구조에서는 연속된 여러 개의 블록들로 구성된 슈퍼블록단위로 플래시 메모리에 기록하게 된다. 본 논문은 병렬처리를 최적화하기 위해 SSD의 버퍼를 비울 때 희생 슈퍼블록을 선정하고 재구성하는 방법을 제안하고 있다. 실험을 통해서 희생 슈퍼블록 선정 방법을 바꾸는 것으로 슈퍼블록단위의 쓰기 횟수를 35% 줄일 수 있고, 슈퍼블록 구성 방법을 달리하여 9%를 추가적으로 더 줄일 수 있었다. Flash memory has several features such as low-power consumption and fast access so that there has been various research on using flash memory as new storage. Especially the Solid State Disk which is composed of flash memory chips has recently replaced the hard disk. At present, SSD adopts the multi-channel and multi-way architecture to exploit advantages of parallel access. In this architecture, data are written on SSD in a unit of a superblock which is composed of multiple blocks in which some blocks are put together. This paper proposes two schemes of selecting, segmenting and re-composing victim superblocks to optimize concurrent processing when a buffer flush occurs. The experimental results show that 35% of superblock- based write operations is reduced by selecting victims and additional 9% by composition of superblock.
박현철(Hyunchul Park),문용준(Yongjun Moon),박대종(Daejong Park),권세진(Sejin Kwon) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
The tire pressure monitoring system (TPMS) market is rapidly growing with legislation making TPMS installation obligatory among automotive developed countries?i.e., Japan, EU, and Korea?in 2012, after the same bill progressed in the USA in 2007. So far, TPMS research is mostly concentrated in the ultralow-power circuit field. However, one of the biggest challenges is overcoming the unavoidable replacement of batteries owing to the self-discharging, unstable performance, etc. of the batteries. Energy-harvesting technology is the only candidate to substitute battery technology. Energy harvesters are modules that generate electric power to operate sensing nodes by gathering wasted energy in the surrounding area. There were two core questions for the key challenges examined in this study: “Which energy source do we use?” and “How much energy do we generate?” The answers would be the design constraints included with the suggested volume of energy harvester.