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최원종(Wonjong Choi),양재영(Jaeyoung Yang),최중민(Joongmin Choi),조현규(Hyeonkyu Cho),조현성(Hyeonsung Cho),김경일(Kyungll Kim) 한국정보과학회 2003 한국정보과학회 학술발표논문집 Vol.30 No.2Ⅰ
인터넷망의 지속적인 발달과 더불어 웹서비스가 차지하는 비중은 매우 커지고 있다. 이와 관련해 서비스 발견을 위한 다양한 노력들이 진행되었으며, 그 중에서도 DAML-S문서로 기술된 매치메이커에서 제시한 알고리즘은 서비스 발견자와 서비스 제공자사이의 서비스 발견에 대한 유사도 측정의 한 방법을 제시하고 있다. 하지만 온톨로지상의 관계표현에 있어 네 가지 규칙만을 적용하여 정밀한 유사도측정이 불가능하다는 단점이 있다. 따라서 본 논문에서는 기존의 알고리즘의 개선을 위해 두 가지 유사도 측정함수 1) 계층구조함수 2) 계층계수함수를 정의하고, 이에 기반한 새로운 서비스 발견 알고리즘을 제시하고자 한다.
정지물체 속도와 자차 속도의 상대비를 이용한 위상 곡선 왜곡 보정 알고리즘
최원종(Wonjong Choi),공영균(Youngkyun Kong) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
Since automotive radars have more robust performance under poor conditions than other sensors and can acquire information about the range, velocity and angle of a target, various studies about autonomous driving systems using radar sensors have been conducted. Unlike the front radar, the rear radar is mounted inside the corners of the rear bumper, causing signal distortion and phase deviation due to the influence of the bumper and internal structure. Since this phase deviation adversely affects the performance of angle estimation, signal distortion by bumper of rear radar is a factor that must be considered. The phase distortion of the signal can be calculated through simulation or measured directly. However, in the case of simulations, it is difficult to fully implement the RF characteristics, and direct measurement methods have a difficult to apply to mass production. Therefore, this paper proposes a method to find out the phase distortion of the signal and calibrate the phase curve through the ratio of the relative velocity between the stationary object and the host vehicle detected while the vehicle is running. This paper describes the proposed algorithm and verify its performance through the analysis of the experimental results in the actual driving environment.
국부적 적층분리결함을 갖는 섬유금속적층판의 기계적 거동 특성
최흥섭,최형집,최원종,하민수,Choi, Heungsoap,Choi, Hyungjip,Choi, Wonjong,Ha, Minsu 항공우주시스템공학회 2007 항공우주시스템공학회지 Vol.1 No.1
In this paper, the interlaminar crack problems of a fiber metal laminate (FML) under generalized plane deformation are studied using the theory of anisotropic elasticity. The crack is considered to be embedded in the matrix interlaminar region (including adhesive zone and resin rich zone) of the FML. Based on Fourier integral transformation and the stress matrix formulation, the current mixed boundary value problem is reduced to solving a system of Cauchy-type singular integral equations of the 1st kind. Within the theory of linear fracture mechanics, the stress intensity factors are defined on terms of the solutions of integral equations and numerical results are obtained for in-plane normal (mode I) crack surface loading. The effects of location and length of crack in the 3/2 and 2/1 ARALL, GLARE or CARE type FML's on the stress intensity factors are illustrated.
적외선 열화상 기술을 이용한 복합재료의 결함 검출 정량화 연구
박희상(Heesang Park),최만용(Manyong Choi),박정학(Jeonghak Park),김원태(Wontae Kim),최원종(Wonjong Choi) 한국비파괴검사학회 2011 한국비파괴검사학회지 Vol.31 No.2
본 논문에서는 현재 산업 전반에 널리 사용되고 있는 복합재료(탄소섬유강화플라스틱, 유리섬유강화플라스틱)의 비파괴검사를 위한 광적외선 열화상기법을 이용한 복합재료 측정 표준기술개발을 위한 결함(인클루젼, 층간결함) 검출 기술을 실험하였다. 결합의 검출률을 높이기 위하여 위상잠금 방법을 활용하였다. 결과는 시험편의 두께에 따라 광원의 조사시간을 늘릴 경우 결함 검출의 확률이 높아진다는 것을 알 수 있다. 하지만 50 mHz 이하의 광원을 가하였을 때에도 결과값이 좋아지지 않는 점은 열확산이 재료 전체에 영향을 미치게 되면 결함 부위가 전체적으로 열평형 상태가 되어 결함 검출이 어려움을 파악할 수 있었다. In this paper, infrared thermography measurement technique has been used to develop standard measurement technique for nondestructive testing of composite materials which is widely used in aerospace industries. To increase the defect detection rate, the related experiment used the lock-in IR-thermographiy method. Therefore it is of considerable interest in the field of non-destructive testing for fast discontinuity detection by using ultrasonic lock-in infrared thermography. The result also shows that as the investigation period of light source is lengthened according to the thickness of specimen, the possibility of detecting defects gets higher as well. However, the reason why the result values were not favorable when less than 50 mHz of light source was provided is because it was difficult to detect defects as the defect parts became a state of thermal equilibrium in general when thermal diffusivity affects the entire materials.
전하 제어법을 이용한 압전 액추에이터의 스트로크이력제어
정순종(Soonjong Jeong),김민수(MinSoo Kim),이대수(Daesu Lee),박언철(Eonchul Park),홍원표(Younpyo Hong),강은구(Eungu Kang),최원종(Wonjong Choi) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
This paper presents a novel way to reduce hysteresis in piezoelectric actuator by connecting the actuator with a capacitor in a series circuit. The change in hysteresis with respect to the capacitor was examined. 0.2Pb(Mg1/3Nb2/3)O₃-0.8Pb(Zr?.₄?? Ti?.?₂?)O₃ ceramic material was used as a piezoelectric material for the actuator. Displacement of the actuator was measured in a capacitive gap sensor measuring system. In case of inserting a capacitor in a total circuit, hysteresis became dramatically decreased, and then finally the hysteresis value can be reduced below 0.3%.