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Jeong, Mi-Yun,Kim, Doo Chul,Song, Changho,Lim,Tong Kun 濟州大學校 基礎科學硏究所 1998 基礎科學硏究 Vol.11 No.1
The effect of light absorption by sample in the analysis of Maker fringe data for estimating a second-order nonlinear coefficient has been studied experimentally. Two theories, one by Jerphagnon and Kurtz that neglects the absorption effect and one by Herman and Hayden that takes into account the absorption effect, were compared with the experimental results. It was found that Jerphagnon and Kurtz's formula was unable to predict correctly not only the magnitude but also the incident angle dependence or the sample thickness dependence of the second harmonic signal generated by the sample with strong absorption, whereas the theory by Herman and Hayden was able to make those predictions fairly well. It was also found that the error in the estimated nonlinear coefficient when one uses Jerphagnon and Kurtz's formula could be as large as 2-4 times the true value, depending on sample thickness. ?? 1998 Optical Society of America
Colorful Multi-Exposure Fusion with Guided Filtering based Fusion Method
Changho Song,Soowoong Jeong,Sangkeun Lee 중앙대학교 영상콘텐츠융합연구소 2016 TechArt :Journal of Arts and Imaging Science Vol.3 No.4
Multi-exposure fusion(MEF) are techniques to obtain the high dynamic range. One of MEF methods, guided filtering-based fusion(GFF) has good performance for preserving details of original images. However, GFF method considers only details, which causes a problem of missing color information. To solve this problem, we proposed a saliency map-based approach for considering both detail and color information. The experimental results show that the proposed method can provide better color quality than the existing methods.
주행 시험 데이터를 이용한 저가형 차량시뮬레이터의 조향감 재현 장치 구현
이창호(Changho Lee),정상윤(Sangyoon Jeong),김성수(Sung-Soo Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A haptic steering system which reflects steering reaction torque has been developed for a fixed base vehicle simulator. The haptic steering system consists of a steering effort sensor, MR-clutch, AC servo motor and controller. In order to generate realistic steering torque feel to driver, 3D torque map is constructed by experimental data and torque generation algorithm using the torque map has been also developed. 3D torque map is constructed using curve fitting and interpolation technique of the measured values of the steering angle, velocity and steering torque from actual slalom test on the proving ground. For curve fitting and interpolation method, model based calibration tool box in Matlab program is utilized. In order to carry out performance test of the developed haptic steering system, fixed based vehicle simulator is constructed by integrating real time vehicle dynamics module, VR-video/audio module, and the haptic steering system. Steering torque and steering angle curves have been obtained from virtual testing in the vehicle simulator and performance of the haptic steering system has been evaluated.
지능형 차량 HILS를 위한 실시간 차량 동역학 모델 개발
이창호(Changho Lee),김성수(Sung-Soo Kim),정완희(Wanhee Jeong),이선호(Sunho Lee) 한국자동차공학회 2006 한국 자동차공학회논문집 Vol.14 No.4
Real time vehicle dynamics models have been developed with the subsystem synthesis method for intelligent vehicle HILS system. Three different models for solving subsystem equations are compared in order to find out the best suitable model for HILS applications. The first model is based on the generalized coordinate partitioning technique, and the second one is on the approximate function approach, and the last one is on the constraint stabilization method. To investigate the theoretical efficiency of three proposed methods, arithmetic operators used in the formulations of three models are counted. Bump run simulations with half-sine bump have also carried out with three different models to measure the actual CPU time to validate theoretical investigation.
정창호(Changho Jeong),임영희(Younghee Im),박주영(Jooyoung Park),박대희(Daihee Park) 한국정보과학회 1999 정보과학회논문지(B) Vol.26 No.1
본 논문에서는 클러스터의 응집성(compactness)과 분리성(separation)을 동시에 고려한 성능지수를 진화 프로그램을 통하여 최적함으로써, 기존 FCM(Fuzzy C-Means) 타입 클러스터링 알고리즘의 문제점 해결 및 성능 향상을 위한 설계 방법을 제시한다. 특히 제안된 방법론은 첫째, 진화 프로그램을 이용하여 기존의 FCM 타입 알고리즘의 클러스터의 개수 문제, 초기화 문제, 그리고 지역적 최적치(local optimum)문제 등을 해결한다. 둘째, 전처리과정을 통하여 전체입력 데이타 중에서 가능한 클러스터의 예비 중심 후보들을 구하여 이를 초기 개체 집단 구성에 사용함으로써, 탐색 공간을 축소하여 알고리즘의 수렴 속도를 향상시킨다. 셋째, 응집성과 분리성을 모두 고려한 성능 지수를 정의하여 클러스터링의 성능을 향상시킨다. 넷째, 잡음 데이타가 중심 탐색에 미치는 영향을 최소화함으로써 잡음 데이타에 대하여 강인한 능력을 갖는다. In this paper, we propose a novel design method for improving performance of existing FCM-type clustering algorithms. First, we define the performance measure which focuses on both compactness and separation of clusters. Next, we optimize this measure using evolution program. Especially the proposed method has following merits ① using evolution program, it solves such problems as initialization, number of clusters, and convergence to local optimum; ② it reduces search space and improves convergence speed of algorithm since it represents chromosome with possible potential centers which are selected possible candidates of centers by density measure; ③ it improves performance of clustering algorithm with the performance index which embedded both compactness and separation properties; ④ it is robust to noise data since it minimizes it effect on center search.