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3D CAD 시스템 환경에서 운전자 시계성에 관한 연구
하용수(Yong Sue Ha),김재정(Jay J. Kim) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_2
This paper introduces a novel method to compute obstruction area on a driver's instrument panels. The obstruction area is usually generated by a steering wheel, hub and spoke and must be considered at the early stage of automobile deign. The current approach to computing obstruction area is proposed by SAE and based on 2D drafting procedures so that it is not precise and error-prone. In the paper we model the obstruction area as the shadows of the steering wheel, hub and spoke considering the human eye as,<br/> Light sources. For computing obstruction area we present an efficient algorithm based on ray tracing and space transformations. It gives ~ore precise results than SAE approach and can be applied when free form curves are <br/>
2D 이미지 기반 형상 변형을 이용한 개인 맞춤형 인체 하반신 모델링
임미희(Mi-hee Lim),박은주(Eun-joo Park),최명환(Myung-hwan Choi),김재정(Jay J. Kim) (사)한국CDE학회 2018 한국CDE학회 논문집 Vol.23 No.2
A realistic and accurate human body model is being used as a powerful tool for designing for a human-centered product as an international trend in ergonomics, game industry, and automobile industry. In this respect, there have been many efforts and studies to obtain the realistic and accurate human body model. But there are limitations on each type of data required to make this model. Therefore, this study proposes a novel method for creating a personalized human body models using two 2D images and a human template model. When the template model is determined through simple individual information such as the user’s height and weight, the personalized human body model is created by the following four steps; i) Image processing and silhouette extraction, ii) Defining characteristic points and creating key-sections, iii) Width deformation through matching with body silhouette, and iv) Creating a sweep-based human body model. Unlike existing methods of generating the human body models through 3D scan data, the proposed method can provide convenience to the user by requesting simple information. In addition, the method can improve accuracy of the model through deforming the width by matching with the body silhouette. Finally, the study demonstrated the validity of the method by comparing the result model generated by the purposed method with the model created through the 3D scan data.
키넥트와 통계 모델에 기반한 특정 개인의 인체 외형 모델링
손세민(Sei-Min Son),구본열(Bon-Yeol Koo),김재정(Jay J. Kim) (사)한국CDE학회 2015 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2015 No.동계
In this paper, we propose a novel modeling framework to generate a subject-specific body shape model using kinects and a statistical model. The modeling framework consists of the following three phases: statistical model construction, rough deformation and fine deformation. In first phase, we construct a statistical body shape model based on 3D whole-body scans. The statistical body shape model is roughly deformed by processing rough deformation with specific subject"s body shape captured by kinects in second phase. Finally, exact body shape of the subject is created in fine deformation phase. In this phase, we propose a new method to guarantee the matching process, between scanned 3D point cloud and the statistical model, to be accurate. Our approach have produced a realistic and detailed body shape model having a high modeling accuracy satisfying specified subject"s body geometry.
해석적 방법의 호스 경로 예측 정확도를 높이기 위한 호스 패턴별 최적 굽힘 강성 계산
서영석(Young-seok Seo),최명환(Myung-hwan Choi),임미희(Mi-hee Lim),김재정(Jay J. Kim) (사)한국CDE학회 2017 한국CDE학회 논문집 Vol.22 No.4
For hydraulic equipped machines the routing design of hydraulic hoses is one of significant factors in preventing interferences and improving kinematic functions between mechanical parts. High pressure hydraulic hoses are in general made of composite materials such as rubber and wire braid for reinforcement. Therefore material properties of the hoses have non-linear behavior and make difficult to compute routing using analytical methods. This study proposes a method for computing virtual material properties by back tracking on actual paths of hydraulic hoses. For this we first extract the centerline of a hose from actual path using a 3D scanner. Then the virtual material property is estimated through optimization to minimize the distances between centerlines of the actual path and of a set of simulated paths computed with analytical software. We provide the discussion to prove the effectiveness of the back tracking method by comparing the computed paths and actual paths generated with many different types of SAE standard hoses.