• 한국생활과학회지
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• 제24권4호
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• pp.555-569
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• 2015

During a design process of a protective equipment for sports activities, minimizing movement restrictions is important for enhancing its functions particularly for protection. This study presents a three-dimensional(3D) modeling methodology for designing baseball catcher's leg guards that will allow maximum possible performance, while providing necessary protection. 3D scanning is performed on three positions frequently used by a catcher during the course of a game by putting markings on the subject's legs at 3cm intervals : a standing, a half squat with knees bent to 90 degrees and 120 degrees of knee flexion. Using data obtained from the 3D scan, we analyzed the changes in skin length, radii of curvatures, and cross-sectional shapes, depending on the degree of knee flexion. The results of the analysis were used to decide an on the ideal segmentation of the leg guards by modeling posture. Knee flexions to 90 degrees and to $120^{\circ}$ induced lengthwise extensions than a standing. In particular, the vertical length from the center of the leg increases to a substantially higher degree when compared to those increased from the inner and the outer side of the leg. The degree of extension is varied by positions. Therefore, the leg guards are segmented at points where the rate of increase changed. It resulted in a three-part segmentation of the leg guards at the thigh, the knee, and the shin. Since the 120 degree knee-flexion posture can accommodate other positions as well, the related 3D data are used for modeling Leg Guard (A) with the loft method. At the same time, Leg Guard (B) was modeled with two-part segmentation without separating the knee and the shin as in existing products. A biomechanical analysis of the new design is performed by simulating a 3D dynamic analysis. The analysis revealed that the three-part type (A) leg guards required less energy from the human body than the two-part type (B).

• 한국산업정보학회논문지
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• 제24권5호
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• pp.17-25
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• 2019

본 논문은 단일 이미지를 패션쇼 워킹 영상으로 변환하는 기술을 소개한다. 일반인이 가상으로 패션모델이 되어 보는 흥미로운 응용일 뿐 아니라, 나아가 가상 착용기술과 함께 결합하게 되면 의상착용결과의 동적인 확인이 가능한 기술이다. 본 논문에서 사용한 기술은 이미지에서 3차원 인간신체 모델을 추정 복원해 주는 SMPLify 기법에 기초하여, 인체 모델에서 의상을 포함한 사람으로 모델을 확장하고, 이에 애니메이션 기법을 적용하여 구현되었다. 인체와 의상을 포한한 사람의 3차원 모델은 2차원 이미지 상에서 기하변형과 깊이정보를 사용하여 복원하였다. 패션 데이터 셋에 적용해 본 결과 정자세의 경우에는 성공적인 수준의 결과를 보였으나, 상용수준의 성능을 위해서는 이미지의 분할 기술, 매핑기술 및 가려진 영역의 복원기술 등 선 후처리 기술에 보완이 필요한 것으로 확인되었다.

• 한국정밀공학회지
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• 제21권8호
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• pp.164-170
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• 2004

The skin movement artifacts are referred to as the relative motion of skin with respect to the motion of underlying bones. This is of great importance in joint biomechanics or internal kinematics of human body. This paper describes a novel experiment that measures the skin movement of a hand based on MR(magnetic resonance) images in conjunction with surface modeling techniques. The proposed approach consists of 3 phases: (1) MR scanning of a hand with surface makers, (2) 3D reconstruction from the MR images, and (3) registration of the 3D models. The MR images of the hand are captured by 3 different postures. And the surface makers which are attached to the skin are employed to trace the skin motion. After reconstruction of 3D models from the scanned MR images, the global registration is applied to the 3D models based on the particular bone shape of different postures. The results of registration are then used to trace the skin movement by measuring the positions of the surface markers.

• 한국광물학회지
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• 제26권4호
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• pp.285-297
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• 2013

하동군 북천면 직전리 일대에는 선캄브리아기 간극누적형 회장암체 내 티탄철석 광상이 발달하고 있다. 정밀 지질조사를 통한 노두 자료와 7개 공의 시추탐사 자료를 바탕으로 GOCAD S/W를 사용하여 티타늄의 자원량을 평가하였다. 티탄철석 광체의 지하 부존상태 및 규모를 예측하기 위해 3차원 모델링을 수행한 결과 5개 맥상 광체가 남북방향으로 발달하였으며, 지구통계학적 기법을 활용하여 평균품위 및 자원량을 산출한 결과 Ti 평균 품위 2.98 wt%, 티탄철석 광량 7,494,303톤 (Ti 223,330톤)이 산정되었다. 이번 연구에 수행된 3차원 모델링을 하동지역 회장암 내 티탄광상 전체에 적용함으로써 티타늄 광체의 3차원적 형태와 자원량 평가에 활용할 수 있을 것이다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2002년도 춘계학술대회 논문집
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• pp.303-311
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• 2002

A first evaluation of the possibilities of high speed trains in conventional railway in Korea have been investigated. The radius of curvature was considered the major problem with high-speed trains in Korea. If KNR(Korea National railway) likes to increase the speed, is then whether KNR shall construct straigthen the track or develop a train that can reduce travel time in curves The research concerns structural design of train car-body is to reduce heavy stress concentration. Using 3D solid modeling, Finite Element analysis and shape optimization combined with powerful postprocessing, graphical display and animation to achieve complete and accurate design and performance will be carried out further project Main purpose of this project is to provide korean tilting train car body's conceptional design. Based on first year research results, the design of car-body will be performed by train manufacture.

• 한국의류학회지
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• 제44권1호
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• pp.53-67
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• 2020

The purpose of this study is to analyze the foot shape and size specification of male high school students. 3D modeling programs such as 'Artec Studio', 'CATIA', and 'Auto CAD' measured the 3D scan data of 361 male high school students provided by KATS. Through principal factor analysis, 10 factors were extracted, including foot length, medial-lateral ratio, and foot length ratio. As the result of the cluster and ANOVA with post-hoc test (Duncan method), the differences among types were clarified. Type 1 (24.7%) represented outward medial-lateral ratio (M-L ratio) with the lowest instep, ankle and little deformed first toe. Type 2 (41.8%) was characterized by the shortest, even M-L ratio, thin ankle and heel, the highest instep and ankle. Type 3 (33.5%) showed the longest, inward M-L ratio, thick ankle and heel, and deformed first toe. As the cross-tabulation of foot length and ball circumference, 17.2 percent was not covered by KS standard; in addition, the foot length was longer than the KS standard. The correlation analysis of key dimensions showed that foot length and ball circumference were highly correlated with other items; therefore, regression equations were derived to estimate other foot measurements using these two items as independent variables.

• 한국정밀공학회지
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• 제20권4호
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• pp.174-182
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• 2003

Recently, medical imaging has taken interest on CAD based solution for anatomical part fabrication or finite element analysis of human body. In principle, contours representing object boundary are obtained through image processing techniques. Surface models are then approximated by a skinning method. For this, various methods should be applied to medical images and contours. The major bottleneck of the reconstruction is to remove shape inconsistency between contours and to generate the branching surface. In order to solve these problems, bi-directional smoothing and the composite contour generation method are proposed. Bi-directional smoothing has advantage of removing the shape inconsistency between contours and minimizing shrinkage effect with a large number of iterations. The composite contour by the proposed method ensures smooth transition in branching region.

• 대한기계학회논문집A
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• 제26권4호
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• pp.667-676
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• 2002

Many studies on the finite element modeling for bolted joints have proceeded, but the structures with bolted joints are complicated in shape and it is difficult to find out the characteristics according to joint condition. Usually, experimental methods have been used for bolted joint analysis. A reliable and practical finite element modeling technique for structure with bolted joints is very important for engineers in industry. In this study, three kinds of model are presented; a detailed model, a practical model and a simple model. The detailed model is modeled by using 3-D solid element and gap element, and the practical model is modeled by using shell element (a portion of bolt head) and beam element (a portion of bolt body), the simple model is modeled by simplifying practical model without using gap elements. Among these models, the simple model has the least degree of freedom and show the effect of memory reduction of 59%, when compared with the detailed model.

• 한국콘텐츠학회논문지
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• 제11권4호
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• pp.428-439
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• 2011

종의 소리는 형상과 합금 특성에 큰 영향을 받는 것으로 알려져 있다. 정확한 형상데이터 측정 방법과 합금성분 데이터를 획득하기 위한 방법의 개발은 종의 연구 뿐 아니라 체계적인 관리에도 매우 중요하다. 광삼각방식을 적용한 레이저스캐너로 정확도가 높은 종의 형상데이터 획득하기 위한 스캐닝 및 모델링 방법들을 제안하였으며 획득된 3차원 형상데이터를 기반으로 높이, 구경 등 두 점간의 거리 뿐 아니라 곡률, 체적, 두께 등 임의의 데이터를 획득할 수 있는 데이터 구축방법을 제시하였다. 합금성분데이터 분석에서 는 기존의 시편 측정방법 대신에 비파괴 측정 방법을 제시함으로써 한국종의 손상 및 부분적인 데이터의 획득이라는 한계를 극복할 수 있도록 하였다. 제안된 방법에 따라 18점의 한국종에 대한 형상 및 합금성분 데이터를 수집하였으며 기존 측정치의 오류를 수정하였다.

• 문화기술의 융합
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• 제9권1호
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• pp.347-353
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• 2023

현재 軍(육군) 입대 장병은 신병훈련소에서 신체에 대한 치수 측정(자동, 수동) 및 샘플 피복을 착용해 본 후, 희망하는 치수로 피복을 지급받고 있다. 하지만, 민간 평상복보다 상대적으로 매우 세분화된 치수 체계를 적용하고 있는 軍에서는 이와 같은 치수 측정 과정에서 발생하는 측정된 치수의 낮은 정확도로 인해 지급받은 피복이 제대로 맞지 않아 피복을 교체하는 빈도가 매우 빈번히 발생하고 있다. 뿐만 아니라 서구적으로 변화된 MZ 세대의 체형변화를 반영하지 않고, 10여 년 전(前)에 수집된 구세대 체형 데이터 기반의 치수 체계를 적용함으로써 재고량이 비효율적으로 관리되는 문제점이 있다. 즉, 필요한 규격의 피복은 부족하고 불필요한 규격의 피복재고는 다수 발생하고 있다. 따라서, 피복 교체빈도를 감소시키고 재고관리의 효율성을 향상하기 위해 딥러닝 기반의 신체 치수 자동측정과 빅데이터 분석 및 머신러닝 기반의 "입대 장병 개인 맞춤형 피복 자동 추천 시스템"을 제안한다.