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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.
정연찬(YunChan Chung),장민호(Minho Chang) (사)한국CDE학회 2009 한국CDE학회 논문집 Vol.14 No.1
Triangular mesh models are widely used in reverse engineering, computer graphics, rapid prototyping and NC (numerical controller) tool-path generation. Triangular mesh models are generated from point clouds, surface models and solid models. A halfedge-based triangular mesh data structure is proposed and the development considerations are presented. In the presented data structure, halfedge is the key data structure. Halfedge stores its triangle index and the order in the triangle. Triangles do not store the halfedge lists explicitly. Halfedge is referred by value and defined when it is required. Proposed data structure supports four design requirements: efficient rendering, compact memory, supporting efficient algorithms and easy programming.
자동차 프레스 패널 성형을 위한 드로 금형의 어덴덤 곡면 모델링
정연찬(Yunchan Chung) 한국생산제조학회 2013 한국생산제조학회지 Vol.22 No.6
In the process of draw die design for stamping automotive press panels, the addendum surfaces generated in metal forming simulation software cannot be used in downstream processes such as machining and making draw dies because simulation tools use simple discrete models for the surface geometry. The downstream processes require more precise and continuous geometric models such as NURBS surfaces. Generally, automotive die engineers manually regenerate the addendum surface geometry using the discrete model. This paper presents an automated geometric modeling process for generating addendum surfaces using draft surface models. The design parameters of the section curve for the addendum surfaces are extracted automatically from the draft geometry. Using the extracted design parameters, smooth addendum surfaces are generated automatically as NURBS surfaces. The generated surfaces are G¹ continuous with the part surface and the binder surface, and can be used in downstream processes.
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.