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Yongseung Oh,Chigak In,조규민 한국정보기술학회 2019 JOURNAL OF ADVANCED INFORMATION TECHNOLOGY AND CON Vol.9 No.2
This paper presents a fully digital controlled power supply unit for the wireless controlled dimmable LED lighting system. The proposed power supply designed using a fly-back converter, which is directly controlled by a microprocessor. Although the proposed circuit does not sense the AC input current and has not AC input voltage feed-forward, it can achieve a high power factor. The proposed power supply directly regulates the output power for LED loads using the PWM and PFM control of the fly-back converter without additional regulator. For a wireless remote control function, the Zigbee modem is equipped in the proposed power supply. A prototype set-up has been built and tested. Through the experiment with a prototype set-up, the usefulness of the proposed power supply is verified.
고온 건식 정제시스템 적용을 위한 Pilot급 석탄가스화기의 운전특성
이승종(Lee, Seung Jong),유상오(Yoo, Sang Oh),정우현(Jung, Woo Hyun),정석우(Chung, Seok Woo),윤용승(Yun, Yongseung) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
자원고갈과 지구온난화 등으로 재생에너지의 사용 및 보급이 지속적으로 증가할 것으로 예상되지만, 세계적으로 매장량이 풍부한 석탄의 사용량은 2030년 이후에도 지속적으로 증가될 전망이다. 따라서 세계 각국은 기후변화 규제에 대응하면서도 청정하게 석탄을 사용하기 위한 기술의 개발 및 보급을 활발히 진행 중이며, 국내에서도 온실가스 감축과 동시에 국가 성장 동력화를 추진하고 있다. 석탄가스화 기술은 석탄을 가스화하여 생산된 CO, H₂가 주성분인 합성가스를 연료로 활용하는 기술로, 이용 효율이 높고 석탄을 천연가스 수준으로 청정하게 사용할 수 있는 차세대 석탄이용 기술이다. 본 연구에서는 pilot급 석탄 가스화기에서 생산된 합성가스에 함유된 산성가스를 고온에서 건식으로 제거하는 시스템을 구축하였으며, 석탄 합성가스를 고온 건식 정제시스템에 공급하기 위한 석탄가스화기의 운전특성을 파악하였다.
( Man Jae Kwon ),( Han-suk Kim ),( Soonyoung Yu ),( Bong-ju Kim ),( Soonjae Lee ),( Young Jae Lee ),( Yongseung Joo ),( Soon-oh Kim ),( Seong-chun Jun ),( Seong-taek Yun ),( Ho Young Jo ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
Better site characterization is important for the successful management of site clean-up and remediation of the contaminated subsurface environments. Since the conventional methods for the site characterization were originally used to assess water resource availability, the methods typically assessed subsurface heterogeneities on the scale of tens of meters. However, heterogeneities in subsurface environments including all geological materials such as soil, sediment, groundwater, and rock that control contaminant fate and transport are on the centimeter to meter scale. For this reason, high-resolution site characterization (HRSC) strategies and techniques have been applied with scale-appropriate measurement and optimal sampling density to better define contaminant distributions. HRSC is a highly effective and integrated strategy to obtain the detailed geologic, hydrogeologic and contaminant information. And this information obtained from HRSC is critical for selecting and designing remedial technologies. For HRSC research, we constructed a test-bed (100m length × 100m width × 100m depth) and evaluated the pathways and behavior of contaminants in both saturated and unsaturated environments using soil and grounwater analysis, geophysical survey, borehole logging, multi-core observation, and high resolution drilling core analysis. This study aims 1) to assess existing field application strategies and technologies for HRSC associated with geological, mineralogical, and biogeochemical data that are suitable for domestic situations and 2) to establish an integrated system that reduces uncertainty in conceptual site model and enables spatially accurate 3D analysis of the high-density dataset.