• 한국자동차공학회논문집
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• 제23권3호
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• pp.254-262
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• 2015

This paper presents 3D collision deformation modelling methodologies using photogrammetry for reconstruction of vehicle accidents. A vehicle's deformation shape in collision provides important information on how the vehicle collided. So effective measurement(scanning) and construction of a corresponding appropriate model are essential in the analysis of collision deformation shape for obtaining much information related to collision accident. Two measurement methods were used in this study: Indirect-photogrammetry which requires relatively small amount of photos or videos, and direct-photogrammetry which requires large amount of photos directly taken for the purpose of 3D modelling. When the indirect-photogrammetry method, which was mainly used in this study, lacked enough photographic information, already secured 2D numerical deformation data was used as a compensation. This made 3D collision deformation modelling for accident reconstruction analysis possible.

• 한국측량학회:학술대회논문집
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• 한국측량학회 2003년도 추계학술발표회 논문집
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• pp.157-162
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• 2003

The 3D Image which embodies real object to 3D space of computer enables various geometrical analysis as well as visualization of complex 3D shape by giving sense for the real and cubic effect that can not be offered in 2D image. Human gives real object to same physical properties in 3D space imagination world of computer, and it is expected that this enables offering of various information by user strengthening interface between human-computer to observe object in real condition. In this study, formal style routine of 3D image creation applying digital photogrammetry was designed for more practical, highly trusty 3D image creation, and the system was emboded using object-oriented technique which strengthen user interface. Also, the discontinuity information about rock slope using 3D image is acquired that is orientation, persistence, spacing and aperture etc.

• 한국군사과학기술학회지
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• 제5권2호
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• pp.228-238
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• 2002

Using the dynamic explicit program NET3D, oblique impact between long rod penetrator and metallic plate was analyzed. Compared with an experiment and AUTODYN-3D analysis result, the accuracy of NET3D program was examined. It was proved that NET3D program could analyze comparatively exactly oblique impact phenomenon between long rod penetrator and metallic plate. The final deformed configuration of penetrator predicted by NET3D program was more close to experimental result than commercial program AUTODYN-3D. But, in order to increase the reliability of NET3D program in the simulation of tensile fracture phenomenon, the additional research is required.

• 대한기계학회논문집A
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• 제35권10호
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• pp.1237-1242
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• 2011

족저부의 압력 분포를 해석하기 위하여 인체에 근접한 족부 상세 해석용 모델을 개발하였다. 이 상세 해석용 모델은 족부의 단층촬영 영상(CT scan image)으로부터 밀도 차이에 따라서 골격부와 피부 및 피하조직을 각각 3D CAD 모델로 변환한 후에 결합하여 구성하였며, 근육과 뼈, 피부 모두를 반영한 3D 족부 유한요소해석 모델로 개발하였다. 개발된 3D 족부 유한요소모델에 대하여 NASTRAN의 접촉해석을 수행하여 족저압의 분포를 계산하였으며, 이러한 결과는 균일분포압력을 작용시키는 당뇨병 환자용 신발 설계의 기초 자료로 활용될 수 있다.

• 국제물리치료학회지
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• 제3권1호
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• pp.364-369
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• 2012

The purpose of this study was to analyze lower limb muscle activity and 3D motion analysis according to change foot arch height during walking. We selected 9 young and healthy people who have been normal foot. And we selected 7 young and healthy people who have been flatfoot. So, people were divided into 2 groups and walked platform during 2 minutes twice for checked by 3D motion analysis. These data were characterized by EMG measurements of three muscles( tibialis anterior, medial and lateral gastrocnemius) while they were walking. The collected data were analyzed by Independent t test using the SPSS statistics program(Ver 12.0). In foot arch change, there were no significant difference in three muscles 3D motion analysis also found that there were no significant difference in joint angles. In this study was to analyze lower limb muscle activity and 3D motion analysis according to change foot arch, but there were no significant difference in 6 muscles neither joint angles.

• 한국지반환경공학회 논문집
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• 제20권10호
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• pp.5-14
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• 2019

최근 우리나라에서도 지진이 발생하여 대도시의 초고층 건물의 내진안정성에 대한 관심이 높아져 이에 대한 연구가 증가하고 있다. 또한 대부분의 내진설계 및 해석은 지반을 간접적으로 고려하고 있고, 3D 동적해석을 이용한 내진해석 연구는 미비한 실정이다. 따라서 본 연구에서는 지반을 포함한 SSI 연속체 모델에 기초한 2D 및 3D 동적해석을 수행하고 거동을 비교 분석하였다. 동적해석을 위해 지반범용해석 프로그램인 MIDAS GTS NX를 이용하여 선형시간이력해석을 수행하였다. 이를 위해 초고층 건물이 기반암 위에 시공되고 표층에 묻혀있는 것으로 가정하고, 선정된 파라미터를 기준으로 민감도 분석을 수행하였다. 동적거동은 수평변위, 층간변위비, 휨응력, 취약부를 이용하여 비교 분석하였다. 대부분의 경우, 2D 동적거동은 3D보다 크게 산출하여 더 보수적인 결과를 보였으며, 취약부의 수와 크기는 증가하는 것으로 나타났다.

• 한국광학회지
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• 제23권1호
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• pp.32-35
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• 2012

본 논문에서는 집적영상방식 3D 디스플레이에서 문제점으로 지적되고 있는 입체감 증가에 따른 영상의 왜곡을 분석하고 인간 시각계의 인지한계에 근거하여 최적입체감을 구현할 수 있는 영역을 제안한다. 또한 실험결과를 통하여 이를 검증하였다.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제52권10호
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• pp.501-506
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• 2003

A Superconducting Rotary Machine (SRM) is characterized by an air-cored machine with its rotor iron and stator iron teeth removed. For this reason, the SRM is featured by 3D magnetic flux distribution, which decreases in the direction of axis. Therefore, 3D magnetic field analysis method is required to know about characteristic of magnetic field distribution of SRM. In this paper, 3D flux distribution of SRM is calculated by analytical method. The magnetic field distribution of the field coils is calculated by Biot-Savart equation. The magnetic core is represented by magnetic surface polarities. This paper describes the combined use of above methods for the total field computation, and compares results of analytical method and 3D FEM(Finite Element Method).

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2000년도 봄 학술발표회 논문집
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• pp.167-172
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• 2000

In this study, the behaviors of a cast-in-situ concrete pile embedded in the weathered rock were analysed by a 3D numerical analysis using PENTAGON 3D and the results were compared with those of the field load test. The load-settlement relation and the load transfer relationship were evaluated from the numerical analysis. As a result, the load-settlement relation at the pile top and the axial load distribution with depth were predicted reasonably. And those results were similar with those of the field load test.

• 한국측량학회지
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• 제13권1호
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• pp.69-76
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• 1995

본 연구는 교량의 3차원 정밀 변형측정을 위해 GPS와 3차원 측정시스템에 의한 정밀기준점 성과를 도출하고, 근접사진측량에 의해 교량의 정밀 3차원 해석을 효율적으로 처리할 수 있는 기법을 연구한 것이다. 연구결과 사진해석의 정확도에 절대적 영향을 미치는 동일좌표계의 참조점 및 기준점의 위치결정을 GPS와 3차원 측정시스템의 조합체제를 도입함으로써 종래의 기준점 측량의 문제를 극복할 수 있었으며, 좁고 긴 구조물의 3차원 변형 해석시 종래의 번거로운 계측과정을 단순화 시킬수 있었으며, 계측기 에 의한 국부적 인 변형해석의 단점을 보완할 수 있었다.