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기후변화에 따른 가지야마 공식 월별 보정계수 개선 및 평가
서지호 ( Seo Jiho ),이동준 ( Lee Dongjun ),이관재 ( Lee Gwanjae ),김종건 ( Kim Jonggun ),김기성 ( Kim Ki-sung ),임경재 ( Lim Kyoung Jae ) 한국농공학회 2018 한국농공학회논문집 Vol.60 No.5
The Kajiyama formula, which is an empirical formula based on the maximum flood data at Korean watersheds, has been widely used for the design of hydraulic structures and management of watersheds. However, this formula was developed based on meteorological data and flow measured during early 1900s so that it could not consider the recently changed rainfall pattern due to climate changes. Moreover, the formula does not provide the monthly coefficients for 5 months including July and August (flood season), which causes the uncertainty to accurately interpret runoff characteristics at a watershed. Thus, the objective of this study is to enhance the monthly coefficients based on the recent meteorological data and flow data expanding the range of rainfall classification. The simulated runoff using the enhanced monthly coefficients showed better performance compared to that using the original coefficients. In addition, we evaluated the applicability of the enhanced monthly coefficient for future runoff prediction. Based on the results of this study, we found that the Kajiyame formula with the enhanced coefficients could be applied for the future prediction. Hence, the Kajiyama formula with enhanced monthly coefficient can be useful to support the policy and plan related to management of watersheds in Korea.
서지호(Jiho Seo),이상수(Sangsu Lee),성낙원(Nakwon Sung) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The effects of split injection on the combustion and formations of soot and NOx were investigated with the idealized injection profile and constant volume chamber. The formation of soot is mainly due to the continuous supply of fuel which is too excessive to be burned at a short time. During the dwell of the split injection, the formation of soot stopped and the air around the spray was entrained into the spray plume. The fuel injected after dwell was burned under the leaner condition that soot formation was suppressed. The main mechanism of soot reduction by split injection is the decrease of soot formation rather than the increase of soot oxidation.
Scattering 환경에서 FMCW MIMO 레이다를 이용한 EKF 기반 SLAM 구현
김세원(Sewon Kim),서지호(Jiho Seo),Huynh Thinh,박재현(Jaehyun Park) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.2
본 논문은 FMCW(Frequency-Modulated Continuous Wave) MIMO(Multiple-Input and Mulitple-Output) 레이다(Radar)를 이용한 EKF(Extended Kalman Filter)기반 SLAM(Simultaneous Localization and Mapping) 알고리즘을 제안한다. 기존 라이다(Lidar)를 이용한 센싱 정보에 기반한 SLAM에 비교해 레이다를 이용할 경우 센싱 정보에 많은 산란점들이 생길 수 있다. 이러한 부정확한 랜드마크 선정으로 인해 SLAM 알고리즘의 성능이 저하된다. 이를 극복하기 위해 본 논문에서는 랜드마크로부터 반사 및 산란된 레이다 수신신호로 랜드마크 선처리 기법을 제안하였으며, 이를 레이다 기반 SLAM에 접목하였다. 모의 실험을 통해 산란환경에서 기존의 레이다 기반 SLAM에 비해 안정적인 추적 성능을 확인하였으며, 이를 통해 레이다 기반의 자율주행을 구현 가능성을 확인하였다.