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정연찬(Yun Chan Chung) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
3D scanner is commonly used to get the geometry of real objects and the density and resolution of the 3D scanner are getting higher. High density 3D scanner generates number of millions 3D points with variable spatial density for each scanning and more than tens of scanning data sets should be processed to get the full 3D geometry of practical parts. Current computing power is not sufficient to process the large data sets. This paper discusses the data structure for efficient processing of the large data sets in 3D scanner. Three data structures are reviewed in amount of computer memory and a computing speed point of view considering the required operations and processing sequences. The proposed data structures and processing sequences were implemented in a commercial 3D scanner system.
두개골 천공을 위한 NeuroMate 로봇의 경로 제어
정연찬(Yun-Chan Chung) 한국생산제조학회 2013 한국생산제조학회지 Vol.22 No.2
This paper presents a linear path control algorithm for NeuroMate robot in a skull drilling system. For the path control inverse kinematics of the robot is analyzed and a linear interpolation algorithm is presented. A geometric approach is used for solving inverse kinematic equations for the robot. Four feasible solutions are found through the approach. The approach gives geometric insights for selecting the best solution from the feasible solutions. The presented linear interpolation algorithm computes a next position considering current velocity and remaining distance to the target position. Presented algorithm is implemented and tested in a skull drilling system.
특별기고 : 동국정운(東國正韻)은 정당(正當)하게 평가(評價)되어야 한다
정연찬 ( Yun Chan Chung ) 서강대학교 언어정보연구소 2015 언어와 정보 사회 Vol.24 No.-
This paper contends that Donggukjeongun was a pronunciation dictionary of Sino-Korean characters in Middle Korean by King Sejong. King Sejong realized that many Sino-Korean words had a incorrect pronunciation, so he tried to establish standard pronunciations of them after collecting and assessing all the pronunciations and phonological characteristics of Sino-Korean characters. He tried to underscore the autonomy of the pronunciations as Donggukjeongun is a unique Korean way of rending Chinese characters. Donggukjeongun is difficult to identify as 운서 (韻書, rhyme dictionary, i.e., books classifying Chinese characters depending on the phonological properties) because it contains little exegesis. Further it does not follow the organization of 운도 (韻圖, rhyme table, i.e., chart showing the place of articulation and aperture along with illustrations). Therefore, Donggukjeongun is identified as a pronunciation dictionary.
측정 데이터 이용한 자동차 외판 미세굴곡 추적 사례 연구
정연찬(Yun Chan Chung),이상헌(Sang Heon Lee),장대순(Dae Soon Chang),박상철(Sang Chul Park) (사)한국CDE학회 2013 한국CDE학회 논문집 Vol.18 No.2
This paper proposes an approach to detect unintended deflections in an automotive outer panel. Conventionally, the detection of unintended deflections has been performed by experienced works, and it requires much amount of time and efforts. The motivation of this work is to reduce such efforts by providing an automated detection methodology. For the detection of unintended deflections, we make use of the measured data from an optical scanner which can be considered as a Z-map data. The proposed approach consists of four major steps; 1) measured data acquisition for an automotive outer panel, 2) identification of shape features, 3) removal of shape features, and 4) detection of unintended deflections via curvature analysis.