• Journal of the HCI Society of Korea
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• v.12 no.2
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• pp.21-29
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• 2017

While the second and the third industrial revolutions made it possible a few standardized designs to be extracted and produced in large quantities, the recent development of the 3D printing technology allowed many individuals to reflect their unique personal characteristics on their creative works and produce them in large quantities-i.e., personally customized designs and mass production of various designs. However, for the customized designs and the mass production of various designs through the 3D printing technology, the individuals should use a 3D modeling software and the supporting features of the software can significantly affect the type and shape of a creative work. In this study, we surveyed the individuals who design the creative works using 3D printers about the type of software that they use and the type of creative works that they design using the software, to propose a possible direction of new software that supports their activities. To do this, we first surveyed sixty members of the OpenCreators, which is the largest 3D printing creator community in South Korea, about the 3D modelling Software that they use for their 3D printing creations, the best 3D modelling software for the 3D printing, and the type of frequently printing creation using the best 3D modelling software. We then analysed the response results. As a result, we found that most of 3D printing creators in South Korea use Rhino and 123D Design. More specifically, the Rhino was being widely used by the people in the 3D printing industry to print prototypes, samples, and mock-ups, while the 123D Design was being mainly used for general purposes such as educational tools, accessories, and home interior accessories. Therefore, we believe it is necessary to develop the software in two separated categories, i.e. for the business, like the Rhino, and for the beginners, and educational and personal purposes, like the 123D Design. Finally, we stressed and proposed the necessity to support individual creators by developing an industry-specific 3D modeling software.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2011.04a
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• pp.367-370
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• 2011

최근 설계 단계에서 설계품질 향상과 시공 단계에서 비용 절감을 효과를 기대하며 3차원 BIM 관련 기술에 대한 관심이 높아가고 있으며, 또한 부분적으로 기술 도입 효과가 나타나고 있다. 그럼에도 불구하고 설계 및 시공 현업은 2차원 CAD 도면을 중심으로 이루어지고 있으며, 3차원 BIM 기반 설계가 이루어진다 하더라도 결국 시공을 수행하는 건설 현장에는 2차원 CAD 도면이 납품되고 이를 기반으로 건설 현장은 운영된다. 또한 설계 단계 BIM과 시공 단계 BIM은 모델의 활용 목적이 다르고 그에 따라 모델링의 범위 및 방법이 크게 다르기에 시공 단계에서 2차원 도면에 기반한 시공 BIM 모델 구축이 필요한 현실이다. 본 연구에서는 2차원 구조 CAD 도면을 인식하여 3차원 골조모델을 생성하는 기술을 개발하고 구현하였다. 통합 BIM 모델은 골조, 설비, 마감으로 구성되며, 이 중 골조 모델은 설비와 마감 모델링을 위하여 선행되어야 할 핵심요소이다. 시공 단계 2차원 도면을 바탕으로 골조 모델의 생성을 생성하는 작업에도 많은 노력이 요구되며, 또한 이 과정에서 모델러가 2차원 도면을 파악하여 BIM 도구를 사용하여 모델링을 하는 과정에서 오류의 가능성도 내포되어 있다. 특히 설비, 마감과의 통합 모델 구축이 원활히 되기 위해서는 골조 상세, 즉 부재 편심 또는 단차 등이 정확히 모델링 되어야 한다. 본 연구의 도면 인식을 통한 3D 골조모델 생성은 2차원 구조평면과 부재일람표에 표기된 내용을 그대로 인식하여 3차원 BIM 모델을 생성함으로써 모델링 효율의 극대화와 모델 정확도 향상의 효과를 기대할 수 있다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.6
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• pp.2013-2020
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• 2010

This paper presents a study on the modeling for transparent toaster with a cap of folding type. The toaster was modelled to solve problems of customer's unsatisfaction such as heat loss, input of a piece of dirt, unidentified heating state of sliced toaster. Rapid prototyping was followed by the first modeling, and the second modeling was implemented in order to solve the problems of the first modeling such as interference of holder and door, and the third modeling was developed with a cap of folding type through analysis of assembly and simulation. The 3D modeling tool used in this paper was Pro/Engineer 4.0. The modeling was designed to minimize heat loss and structured with transparent outer case. So the toasting procedure will be identified with the naked eye, and the transparent toaster will improve the customer's aesthetic satisfaction.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2018.11a
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• pp.53-54
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• 2018

주어진 영상으로부터의 3 차원 얼굴 모델링은 얼굴 분석, 애니메이션, 생체 인식 등의 많은 컴퓨터비전 및 그래픽스 응용분야에서 중요한 역할을 하고 있다. 그 중에서도 헤어 영역은 얼굴에 비해 모양의 다양성과 모델의 복잡도가 현저히 높다. 기존의 연구는 주로 얼굴 영역에 한정한 3 차원 얼굴 모델링을 중심으로 이루어졌지만 헤어 모델링은 중요하게 다루지 않고 있는 경우가 많다. 본 논문에서는 심층인공신경망의 일종인 FCN (fully connected network)을 이용하여 인물 영상에서 헤어 부분을 영역화하고 그와 가장 유사한 3D 헤어 모델을 데이터베이스에서 검색하여 3 차원 얼굴 모델에 증강함으로써 완전한 얼굴 모델링을 수행하는 방법을 제안한다. 이는 FCN 을 이용하여 다양한 인물 영상에 대하여 네트워크 학습을 수행하는 과정과 3D 헤어 데이터베이스의 구축 과정을 포함한다. 실험 결과 적절한 수준의 헤어 모델이 3 차원 얼굴 모델링 결과물에 증강됨을 확인하였다.

• Journal of the Korean Society of Radiology
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• v.10 no.8
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• pp.571-576
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• 2016

3D printing has recently been used in various fields. Among various applications, 3D face data must be generated for 3D face printing. A laser scanner is used to acquire 3D face data, but there is a restriction that a person should not move during scanning. In this paper, we propose a 3D face modeling method based on a single image and a face transformation system to use the generated 3D face for virtual cosmetic surgery. We have defined facial feature points from the 3D face database for 3D face data generation. After extracting feature points from a single face image, 3D face of the input face image is generated corresponding to the 3D face feature points defined from the 3D face database. After 3D face modeling, 3D face modification part is applied for use such as virtual cosmetic surgery.

• Spatial Information Research
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• v.21 no.2
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• pp.73-83
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• 2013

3D cadaster problems are getting attention and studied increasingly. However, correct concepts have not been established for three dimensional land uses and different rights problems around them. This is primarily due to the lack of proper methods for implementation and operation of 3D cadaster. 3D cadaster requiring far more huge data than 2D should be built in DBMS and need appropriate methods and processes for this. This study propose a method to model 3D cadaster using DBMS. First, it analyse and visualize possible problems around divided superficies in 3D spaces. Based on this, it illustrates UML models and shows an O-R mapping process to implement them using a RDBMS.

• Journal of The Korean Digital Architecture Interior Association
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• v.1 no.1
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• pp.39-45
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• 2001

The purpose of this study is to suggest the possibility which can use as instrument of design by CAD system. And it proposes how makes 3D object model through 2D Drawings in Design process. This study has review the 'Study Drawing' in design process, and application method of CAD as the Architectural Design Integration System. The Architecture can work in ani of the traditional 2D representations as well as in 3D and immediate visual feedback of his work in isometric and perspective projrctions.

• Journal of the Korean Institute of Intelligent Systems
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• v.19 no.1
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• pp.1-5
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• 2009

This paper suggests to apply mirror-reflected method based 2D emotion recognition database to 3D application. Also, it makes facial expression of fuzzy modeling using probability of emotion. Suggested facial expression function applies fuzzy theory to 3 basic movement for facial expressions. This method applies 3D application to feature vector for emotion recognition from 2D application using mirror-reflected multi-image. Thus, we can have model based on fuzzy nonlinear facial expression of a 2D model for a real model. We use average values about probability of 6 basic expressions such as happy, sad, disgust, angry, surprise and fear. Furthermore, dynimic facial expressions are made via fuzzy modelling. This paper compares and analyzes feature vectors of real model with 3D human-like avatar.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.25 no.11
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• pp.1670-1675
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• 2021

The adoption of smart construction technology in the construction industry is progressing rapidly. By utilizing smart construction technologies such as BIM (Building Information Modeling), drones, artificial intelligence, big data, and Internet of Things technology, it has the effect of lowering the accident rate at the construction site and shortening the construction period. In order to introduce a digital twin platform for construction site management, real-time construction site management is possible in real time by constructing the same virtual space. The digital twin virtual space construction method collects and processes data from the entire construction cycle and visualizes it using a 3D model file. In this paper, we introduce a modeling automation technique that constructs an efficient digital twin space by automatically generating 3D modeling that composes a digital twin space based on 3D spatial data.

• Journal of the Korean Society for Railway
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• v.13 no.2
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• pp.139-146
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• 2010

In this study, a new equivalent modeling technique of rollingstock for 1-D collision dynamics was proposed using crash analysis of 3-D finite element model in some detail. To obtain good simulation results of 1-D dynamic model, the force-deformation curves of crushable structures should be well modelled with crash analysis of 3-D finite element model. Up to now, the force-deformation curves of the crushable structures have been extracted from crash analyses of sectionally partitioned parts of the carbody, and integrated into 1-D dynamic model. However, the results of the 1-D model were not satisfactory in terms of crash accelerations. To improve this problem, the force-deformation curves of the crushable structures were extracted from collision analysis of a simplified train consist in this study. A comparative study applying the suggested technique shows in good agreements in simulation results between two models for KHST.