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Steer-by-Wire의 조향 반력 제어 유닛 개발에 대한 연구
이상준(Sangjun Lee),이용권(Yongkwon Lee),정현진(Hyunjin Jeong),이민혁(Minhyuk Lee) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
This paper is about Steer-by-Wire of the next generation steering system to be applied to autonomous driving vehicles. This paper covers a study of the Force Feedback Unit in the Steer-by-Wire system that affects the driver’s steering feel. To provide the driver with the same steering feel as the existing Electronic Power Steering system, we selected the target vehicle. And then, we measured and analyzed the results of the Electronic Power Steering system evaluation and applied them to the study before starting the study. To design the Force Feedback Unit, we analyzed the dynamic motion of the vehicle and related parameters and applied them to the vehicle dynamics simulation (dSPACE, ASM). In the Steer-by-Wire system, the column’s Force Feedback Unit control algorithm was model-based designed and the performance was validated at the Hardware in the Loop level.
한국 주식시장에서의 군집화 기반 페어트레이딩 포트폴리오 투자 연구
조풍진,이민혁,송재욱,Cho, Poongjin,Lee, Minhyuk,Song, Jae Wook 한국산업경영시스템학회 2022 한국산업경영시스템학회지 Vol.45 No.3
Pair trading is a statistical arbitrage investment strategy. Traditionally, cointegration has been utilized in the pair exploring step to discover a pair with a similar price movement. Recently, the clustering analysis has attracted many researchers' attention, replacing the cointegration method. This study tests a clustering-driven pair trading investment strategy in the Korean stock market. If a pair detected through clustering has a large spread during the spread exploring period, the pair is included in the portfolio for backtesting. The profitability of the clustering-driven pair trading strategies is investigated based on various profitability measures such as the distribution of returns, cumulative returns, profitability by period, and sensitivity analysis on different parameters. The backtesting results show that the pair trading investment strategy is valid in the Korean stock market. More interestingly, the clustering-driven portfolio investments show higher performance compared to benchmarks. Note that the hierarchical clustering shows the best portfolio performance.
전압 제어 응답성 향상을 위한 DC-DC 컨버터의 부하 전류 보상기 설계
황윤경(Hwang Yunkyung),이민혁(Lee Minhyuk),남광희(Nam Kwanghee) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
In the DC-DC Converter, the voltage regulation performance is disturbed when a large step load current is applied or removed. To mitigate the voltage ripple, load current compensator is commonly used, but is has poor performance in the transient. To improve the transient performance, a differentiator type compensator is added to the classical load current compensator. The performance improvements are shown through simulation and experiment results.