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Head motion correction based on filtered backprojection for x‐ray ct imaging
Jang, Seokhwan,Kim, Seungeon,Kim, Mina,Ra, Jong Beom Published for the American Association of Physicis 2018 Medical physics Vol.45 No.2
<P>Conclusions: We propose a framework for head motion correction in an axial CT scan, which consists of motion estimation and compensation steps. Two image-based ME algorithms for rigid motion tracking are developed according to the degree of head motion. The estimated motion information is then used for MC image reconstruction. Both motion estimation and compensation algorithms are based on computationally efficient filtered backprojection. Excellent performance of the proposed framework is illustrated by means of simulations using a numerical phantom and experiments using a physical phantom. (C) 2017 American Association of Physicists in Medicine</P>
장석환(Seokhwan Jang),박범준(Bumjun Park),정제창(Jechang Jeong) 한국방송·미디어공학회 2018 한국방송공학회 학술발표대회 논문집 Vol.2018 No.11
본 논문은 Multiscale Gradients (MSG)를 기반으로 한 Color Filter Array Interpolation을 토대로 개선된 필터와 보간 과정의 알고리듬을 제안한다. MSG는 초록색 채널 보간, 초록색 채널 갱신, 빨간색 및 파란색 채널 보간 과정으로 이루어진다. 이때, 더욱 정교한 보간을 위해 필터의 크기를 증가시키고, 보간 과정에 이용되는 주변 픽셀의 개수를 늘렸다. 이러한 실험을 통해 높은 스펙트럼 상관관계, 낮은 채도, 낮은 색 경사도를 가진 Kodak dataset과 자연 영상과 유사한 특성을 갖는 McMaster dataset 모두의 경우에서 Color Peak Signal to Noise Ratio (CPSNR)이 향상되는 것을 확인하였다.
차량 주행시 조향에 따른 리플 및 진동 특성에 대한 연구
장석환(Seokhwan Jang),황필상(Pilsang Hwang) 한국자동차공학회 2023 한국자동차공학회 학술대회 및 전시회 Vol.2023 No.11
Steering is a kind of drivings starting point. This is very important for vehicles behavior. At this time several difference steering feel is also influenced to driver for comfort steering. For example, in parking and signal waiting and so on. In these static case, low speed steering is caused to low frequency vibration and ripple and fast speed steering is reasoned to low frequency vibration and noise. And these root case is studied and improved for a long time. But dynamic case, compare with static case, it is very easy to get disturbance. At this time, steering torque is different frequency and magnitude with static case. Therefore static case filtering method is difficult to improve dynamic case ripple and vibration. So in this paper, from EPS to vehicle body, studied dynamic drivings special noise characteristics and method to optimize them.
조향감과 차량 안정성 향상을 위한 Steer-by-Wire 제어기 개발
장재호(Jaeho Jang),박동진(Tongjin Park),오세욱(Sewook Oh),장석환(Seokhwan Jang),한창수(Changsoo Han) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_2
In this paper, the SBW controller was developed for improving the steering feel and vehicle stability. There are two motors in SBW system controlled by one ECU. One motor in steering wheel is to improve driver's steering feel and the other motor in steering linkage is to improve the vehicle maneuverability and stability. The steering wheel and front wheel modeling is designed using bond graph method. The control aim of the steering wheel motor is that the equation of the steering wheel motor has output torque for following steering feel as a conventional steering system At high speeds, vehicle stability could be compensated using the under steer gradient and yaw rate feedback control minimizing a side-slip angle. As a result the performance of the SBW controller can be verified the controller of an SBW shows the as good performances as through the full-vehicle simulations and the controller was available for improving steering feel and vehicle stability.
Atomic-scale observation of plaquette antiferromagnetic order coexisting with iron superconductivity
Seokhwan CHOI,Won-Jun JANG,Jong Mok OK,Hyun Woo CHOI,Hyun-Jung LEE,Se-Jong KAHNG,Young KUK,Ja-Yong KOO,Sungbin LEE,Sang-Wook CHEONG,Jun Sung KIM,Jhinhwan LEE 한국진공학회 2016 한국진공학회 학술발표회초록집 Vol.2016 No.8