• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제13권5호
• /
• pp.2414-2433
• /
• 2019

The aim of this paper is to design a 3D laser radar prototype based on laser triangulation. The mathematical model of distance sensitivity is deduced; a pixel-distance conversion formula is discussed and used to complete 3D scanning. The center position extraction algorithm of the spot is proposed, and the error of the linear laser, camera distortion and installation are corrected by using the proposed weighted average algorithm. Finally, the three-dimensional analytic computational algorithm is given to transform the measured distance into point cloud data. The experimental results show that this 3D laser radar can accomplish the 3D object scanning and the environment 3D reconstruction task. In addition, the experiment result proves that the product of the camera focal length and the baseline length is the key factor to influence measurement accuracy.

• 한국BIM학회 논문집
• /
• 제4권3호
• /
• pp.1-9
• /
• 2014

As BIM application continues to increase in civil engineering, in this study, 3D information model for RC(Reinforced Concrete) bridge pylon was developed and verified its effectiveness at the structural-design stage. To define 3D information model of RC A-Type pylon, characteristics of pylon were analyzed and 3D model structure was constructed. The 3D information model, one of the core product of BIM, manages all information generated during all life-cycle of a structure and consequently maximizes the efficiency of utilizing information. Also, this study proposes interface module between input data in structural analysis and 3D model of RC pylon. The module can create the input data for non-linear structural analysis. It is essential to study on method of developing 3D information model and propose a structural analysis model by utilizing 3D model for the effective use of BIM techniques in construction industry. The results of this study can be used as the base data for developing the 3D information model of RC pylon in the structural analysis field.

• 디지털융복합연구
• /
• 제17권4호
• /
• pp.309-317
• /
• 2019

본 연구는 3D 프린팅 기술에 대한 이론적 고찰과 이를 창의적으로 작품에 접목시킨 도자작품 사례분석을 통하여 3D 프린팅 기술이 도자작품의 조형성과, 예술적 가치에 미치는 영향을 재조명고자 하였다. 이에 작가 7인과 두 디자인팀의 도자작품 사례분석으로 다음과 같은 결론을 도출하였다. 첫째, 3D 프린팅 기술을 작품에 접목시킨 디지털제작은 기존의 수작업 방식과 달리 데이터 응용 및 변경이 가능하여 작가의 개성 있는 창작 예술품이 가능하다. 둘째, 새로운 소재와 방식, 첨단 디지털기술로 기존의 도자개념을 벗어난 보다 입체적이고 다채로운 조형물로 표현의 새로운 패러다임을 만들어 나가고 있었다. 앞으로 3D 프린팅에 대한 계속적인 연구와 활용으로 발전하는 디지털 기술에 부합하는 새로운 방법론을 찾아내고 실현하여, 미적 가치와 아름다움을 가진 도자디자인의 새로운 가치가 재창조되기를 기대해본다.

• 한국정보통신학회:학술대회논문집
• /
• 한국정보통신학회 2018년도 춘계학술대회
• /
• pp.612-614
• /
• 2018

현재 사진으로 모델링데이터를 획득 할 수 있는 기술이 등장하고 있다. 다양한 조형물, 건축 및 캐릭터에 대한 3D 모델링 제작은 많은 시간을 투자하여 제작되고 있다. 콘텐츠산업에서도 많이 활용되고 있는 3D 모델링 제작방식은 정확한 측정 도구 없이 스케치된 도면을 중심으로 제작자의 직감적 감각을 이용하여 모델링데이터를 생성하고 있는 것도 사실이다. 최근에는 사진정보의 조합으로 조형물의 정확한 3차원 데이터를 생성하고 재구성하여 기존 디자인의 변형이나 수정이 용이하게 할 수 있는 기술이 발달하고 있다. 본 논문은 대상물에 대한 여러 장의 사진 데이터를 활용하여 정밀한 3차원 모델링 데이터를 생성하는 방법을 연구하고 이를 활용할 수 있는 방안을 제안한다.

• 한국생산제조학회지
• /
• 제24권2호
• /
• pp.166-171
• /
• 2015

In this study, an automation tool was developed for rapid evaluation of machine tool spindle designs with automated three-dimensional finite element analysis (3D FEA) using solid elements. The tool performs FEA with the minimum data of point coordinates to define the section of the spindle shaft and bearing positions. Using object-oriented programming techniques, the tool was implemented in the programming environment of a CAD system to make use of its objects. Its modules were constructed with the objects to generate the geometric model and then to convert it into the FE model of 3D solid elements at the workbenches of the CAD system using the point data. Graphic user interfaces were developed to allow users to interact with the tool. This tool is helpful for identification of a near optimal design of the spindle based on, for example, stiffness with multiple design changes and then FEAs.

• 한국CDE학회논문집
• /
• 제12권1호
• /
• pp.74-85
• /
• 2007

During the lifecycle of a nuclear power plant many organizations are involved in KOREA. Korea Plant Engineering Co. (KOPEC) participates in the design stage, Korea Hydraulic and Nuclear Power (KHNP) operates and manages all nuclear power plants in KOREA, Dusan Heavy Industries manufactures the main equipment, and a construction company constructs the plant. Even though each organization has a digital data management system inside and obtains a certain level of automation, data sharing among organizations is poor. KHNP gets drawing and technical specifications from KOPEC in the form of paper. It results in manual re-work of definition and there are potential errors in the process. A data warehouse based on a neutral model has been constructed in order to make an information bridge between design and O&M phases. GPM(generic product model), a data model from Hitachi, Japan is addressed and extended in this study. GPM has a similar architecture with ISO 15926 "life cycle data for process plant". The extension is oriented to nuclear power plants. This paper introduces some of implementation results: 1) 2D piping and instrument diagram (P&ID) and 3D CAD model exchanges and their visualization; 2) Interface between GPM-based data warehouse and KHNP ERP system.

• 한국CDE학회논문집
• /
• 제12권6호
• /
• pp.413-421
• /
• 2007

3D rendering is becoming a common feature of mobile application programs with the rapid advance of mobile devices. Since the existing rendering engines do not provide triangulation functions, mobile 3D programs have focused on an efficient handling with pre-tessellated geometry. In addition, triangulation is comparatively expensive in computation, so it seems that the triangulation cannot be easily implemented on mobile devices with limited resources. Triangulation of 3D geometry is the essential process of visualization of 3D model data and many different triangulation methods have been reported. We developed a light and fast visualization process that involves constrained triangulation based on Voronoi diagram and applied it to a mobile computer application. In this paper, we applied kd-tree to the original incremental construction algorithm and produced new O(nlogn) incremental construction algorithm. And we show a simple and efficient constrained triangulation method based on Voronoi diagram. This paper also describes an implementation of mobile STEP data viewer as an application of our proposed algorithms.

• Journal of Computational Design and Engineering
• /
• 제1권2호
• /
• pp.96-102
• /
• 2014

In the field of design and manufacturing, there are many problems with managing dynamic states of three-dimensional (3D) objects. In order to solve these problems, the four-dimensional (4D) mesh model and its modeling system have been proposed. The 4D mesh model is defined as a 4D object model that is bounded by tetrahedral cells, and can represent spatio-temporal changes of a 3D object continuously. The 4D mesh model helps to solve dynamic problems of 3D models as geometric problems. However, the construction of the 4D mesh model is limited on the time-series 3D voxel data based method. This method is memory-hogging and requires much computing time. In this research, we propose a new method of constructing the 4D mesh model that derives from the 3D mesh model with continuous rigid body movement. This method is realized by making a swept shape of a 3D mesh model in the fourth dimension and its tetrahedralization. Here, the rigid body movement is a screwed movement, which is a combination of translational and rotational movement.

• 패션비즈니스
• /
• 제14권4호
• /
• pp.161-173
• /
• 2010

This study aims to examine for efficient production methods of custom-tailored clothing and application of 3D virtual clothing system in custom-tailored clothing market, by producing and analyzing both real clothing and 3D virtual clothing. For this study, a middle-aged woman is selected as the subject figure and one-piece is selected as the experimental clothes item. In real clothing, I conducted the wearing evaluation for experts and the subject figure. And In the virtual clothing, I conducted the wearing evaluation with i-Designer using 3D virtual clothing on simulation program. There are some differences between the data from body scanning and the real body size. In the custom-tailored clothing market in which the fitness is important, the research which measures the more exact data is needed. And in the case of complicate design, the functions which measure the activity and the fitness variously and correct the parts of curves are needed. This study experiments the availability of application of 3D Virtual Clothing System in custom-tailored clothing market by selecting one-piece as the experimental clothes item. So the follow-up studies for the other designs and fabrics are needed. Also, if the studies for checking the clothes pressure, the amount of composure, the space between skin and clothing when the virtual model wearing clothes is walking or shaking his arms are proceeding, then 3D virtual clothing System is applicable in custom-tailored clothing market. But there are some restrictions and lack of education in virtual clothing System yet, and it makes hard for workers in clothing market to use it in real production. However, 3D virtual clothing System will be practical in real market if there would be more research on its usability and practicality, and workers in clothing market can be easily educated on techniques of 3D virtual clothing system.

• 한국산학기술학회논문지
• /
• 제22권2호
• /
• pp.50-56
• /
• 2021

본 연구는 3D 스캐닝에 대해 고찰하고 건축분야에서의 활용 동향, 시공 이후 공간에 3D 스캐닝 기술을 활용하여 시공 준공도면과 시공 후 데이터를 추출하여 도면과 데이터를 비교하며 기존 시공 준공도면과의 차이점을 도출하고 이를 통해 3D 스캐닝을 활용하여 건축 전반적인 부분에서 어떻게 활용되어야 하는지에 대해 이 연구의 목적이 있다. 현재 3D 스캐닝 기술은 현재 현장에 적용하여 설계, 시공, 안전까지 건축분야 전반적으로 널리 활용되어 지고 있다. 3D스캐닝 데이터와 기존 도면을 비교한 연구 결과는 다음과 같다. 첫째, 외부 형태와 치수는 크게 차이를 보이지 않는다. 둘째, 내부 형태와 치수는 차이를 보이고 있다. 셋째, 실내조명 배치는 모든 건축물에서 차이를 보이고 있다. 3D스캐닝은 준공되기 전 시공 단계에서도 필수적인 요소가 되어야 할 것으로 보이며, 자동화, 로봇 등을 이용하여 지속적인 3D 스캔을 통해 시공 및 안전관리의 효율성을 높이고, 자재관리 등 감리의 목적으로 활용되어야 할 것이며, 이를 통한 BIM, 공정관리 등 건축 전반적인 분야에서의 후속 연구가 필요할 것으로 보인다.