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Matlab을 이용한 궤도틀림과 진동가속도 상관관계 분석
임윤식(Yun-Sik Lim),최일윤(Il-Yoon Choi) 한국철도학회 2012 한국철도학회 학술발표대회논문집 Vol.2012 No.5
It is highly important to make a track irregularities standars appropriately considering the running behavior of the vehicle as well as the maintenance policy for the track. In this paper, the relationship between track irregularities and the acceleration of KTX were investigated to show how the longitudinal level and alignment influence on the lateral and vertical acceleration of KTX. using the measurement data in Kyeongbu high speed line.
임윤식(Yun-Sik Lim),최일윤(Il-Yoon Choi) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
Vehicle dynamic behavior should be investigated to establish the track irregularity criteria because they have an impact on vehicle dynamic behavior. The tilting train which have been developed in Korea will be operated on the conventional line. Therefore it should be checked that the track irregularity criteria of conventional line is still available for the new vehicle. In this paper the influence of alignment on running behavior and safety for tilting train was instigated by numerical analysis. The wavelength and amplitude of alignment were considered in scenario of this numerical analysis. This research is based on just numerical analysis and the final result which include measurement will be published in the future.
월쉬 단일항 전개를 이용한 비선형 확률 시스템의 상태추정
林潤植(Yun-Sik Lim) 대한전기학회 2008 전기학회논문지 P Vol.57 No.2
The EKF(Extended Kalman filter) method which is the state estimation algorithm of nonlinear stochastic system depends on the initial error and the estimated states. Therefore, the divergence of the estimated state can be caused if the initial values of the estimated states are not chosen as approximate real state values. In this paper, the demerit of the existing EKF method is improved using the EKF algorithm transformated by STWS(Single Term Walsh Series). This method linearizes each sampling interval of continous-time system through the derivation of an algebraic iterative equation without discretizing continuous system by the characteristic of STWS, the convergence of the estimated states can be improved. The validity of the proposed method is checked through comparison with the existing EKF method in simulation.
새로운 고속월쉬 변환을 이용한 고속의 고조파 신호 측정기 설계
임윤식(Lim yunsik),유영식(Yoo Youngsik) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.11
Using the New Fast Walsh Transform algorithm, we present a new algorithm which reduces the computational amount, and it can consequently calculate the real and imaginary components for current and voltage signals of power system in sampling intervals. The calculation amount is reduced to 2X(m-1) at m samples to measure full harmonics using developed algorithm. When in single harmonic measuring, it needs only 2(log2N-1)+1 additions and subtractions. We developed hardware device for testing, and tested the developed algorithm by measuring real and imaginary components.
전우진,정재교,전성준,윤대현,임윤식,석종민,Jeon, Woo-Jin,Jeong, Jae-Kyo,Chun, Sung-Joon,Yoon, Dae-Hyun,Lim, Yoon-Sik,Seok, Jong-Min 대한디지털의료영상학회 2014 대한디지털의료영상학회논문지 Vol.16 No.1
This study, was conducted to find out the correlation factors of anxiety of the patients during MRI exam on the claustrophobia. This study conducted a survey targeting those korea auxiliary police and combat auxiliary police patients who were admitted to the National Police Hospital over a period from January 2 to December 24, 2013 to investigate their degree of claustrophobia. In study result, sufficient explain before exam was helpful and decrease anxiety. However, they felt more anxious about limited spare, and when the entered a bore. Symptoms of instability and fear were stuffy, sweat, dyspnea, palpitation those are ascending rank of frequency.