• Proceedings of the Korea Information Processing Society Conference
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• 2017.04a
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• pp.1017-1019
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• 2017

데스크탑 성능의 상향과, 그래픽 소프트웨어의 발전으로 더욱 현실적이고 자연스러운 컴퓨터 그래픽을 지원하는 게임에 대한 수요가 증가하고 있다. 3D 게임 내에서 사용자들의 게임 수행 능력과 컴퓨터 그래픽의 자연스러움은 초당 프레임 수(FPS)에 비례하므로, 더 높은 초당 프레임 수를 보장한다면 발전된 게임 수행 능력을 기대할 수 있다. 따라서 본 논문에서는 크로스 플랫폼을 지원하는 대표적인 게임 엔진인 Unity 3D와 오픈 그래픽 라이브러리인 OpenGL 간의 초당 프레임 수를 비교한다. 이를 바탕으로 추후 3D 물체에 대한 자연스러운 움직임에 대한 연구를 수행할 수 있을 것으로 예상한다.

• Journal of Korea Multimedia Society
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• v.22 no.5
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• pp.580-587
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• 2019

In this paper, a plane detection method using depth information is proposed. 3-D characteristics of a pixel are defined as a direction and length of a normal vector whose is calculated from a plane consisting of a local region centered on the pixel. Image coordinates of each pixel are transformed to 3-D coordinates in order to obtain the local planes. Regions of each plane are detected by calculating similarity of the 3-D characteristics. The similarity of the characteristics consists of direction and distance similarities of normal vectors. If the similarity of the characteristics between two adjacent pixels is enough high, the two pixels are regarded as consisting of same plane. Simulation results show that the proposed method using the depth picture is more accurate for detecting plane areas than the conventional method.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2008.11a
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• pp.297-300
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• 2008

Since the Three Dimensional Computer Aided Design(3D CAD) appeared in 1990s, Building Information Modeling(BIM) has got the great issue in the construction project nowadays. BIM is the process of managing and generating building information during life cycle of a construction project. And information can be moved to 3D modeling flexibly in BIM. As a result, a field of estimating has also been doing researches in the calculation of the amount of building materials from 3D modeling. And the Construction Cost Estimating Software which is generally used over the world has been trying to be applied to the Construction project in Korea. But, when we consider the productivity, it is less efficient than the existing way in Korea which use the 2D Drawings when they take off the Quantity. Also, there are lots of difference how to estimate the construction cost. between Korea and the others. Because it is a bit hard to apply the software used in the other countries to the construction project in Korea, people couldn't use it well in the construction project actually. In this study, for developing the appropriate construction cost estimating software rooted in 3D in Korea, we suggest 3D CAD Add-on Program for a Quantity Take-off which can move quantitative information to 3D CAD.

• Geophysics and Geophysical Exploration
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• v.5 no.2
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• pp.71-77
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• 2002

We developed a modeling and visualization software that can analyze 3-dimensional seismic data. The software divides 3 dimensional space into a series of vertical and horizontal polygons, and allows the various seismic attributes and other spatial information to be stored on these polygons. The program can pick a particular pattern in semi-automatic mode, and store the pattern in the spatial DB. The pattern can be modeled and visualized in 3 dimensional space.

• Proceedings of the Korea Information Processing Society Conference
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• 2022.05a
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• pp.708-711
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• 2022

본 논문은 3D 프린팅 출력 성공률을 높이기 위해 GPU를 이용한 대용량 3D 메쉬 모델에 대한 병렬 자체충돌 검사 방법을 제안한다. 강인하고 견고한 자체 충돌 검사를 위해 분리축 검사, 삼각형-삼각형 교차 검사, 메쉬 연결성 검사, 대용량 메쉬를 위한 분할 처리 기법의 절차를 제안한다. 이러한 자체 충돌 검사를 빠르게 수행하기 위하여 GPU 기반 병렬처리 구현 방법을 제시한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2020.11a
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• pp.428-430
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• 2020

국내 3D프린터 사용자가 확산되며 3D프린터의 외부확인을 할 수 있는 기능을 원하는 국내 사용자들은 주로 사용하는 원격 모니터링 기능을 수행하는 오픈 소스인 OctoPrint (이하 옥토프린트)사용한다. 하지만 최근, 옥토프린트에 대한 보안 이슈가 등장하였고 이를 경험한 사용자들에게 새로운 보안 방안이 요구된다. 본 논문에서는 옥토프린트의 단점과 보안 취약점을 설명하고, 옥토프린트의 공식 사이트에서 권장하는 보안 설정을 분석하여 특징을 조사하였다. 기존 옥토프린트의 편의성 개선을 위해서 동일 기능을 수행하는 프로토타입을 구현하여 앞으로의 원격 제어 모니터링 시스템 구현에 대해 연구하였다.

• Journal of the Ergonomics Society of Korea
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• v.34 no.6
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• pp.583-595
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• 2015

Objective: The purpose of this study was to determine the reliability of lower limb joint angles computed with the software ImageJ during jumping movements. Background: Kinematics is the study of bodies in motion without regard to the forces or torques that may produce the motion. The most common method for collecting motion data uses an imaging and motion-caption system to record the 2D or 3D coordinates of markers attached to a moving object, followed by manual or automatic digitizing software. Above all, passive optical motion capture systems (e.g. Vicon system) have been regarded as the gold standards for collecting motion data. On the other hand, ImageJ is used widely for an image analysis as free software, and can collect the 2D coordinates of markers. Although much research has been carried out into the utilizations of the ImageJ software, little is known about their reliability. Method: Seven healthy female students participated as the subject in this study. Seventeen reflective markers were attached on the right and left lower limbs to measure two and three-dimensional joint angular motions. Jump performance was recorded by ten-vicon camera systems (250Hz) and one digital video camera (240Hz). The joint angles of the ankle and knee joints were calculated using 2D (ImageJ) and 3D (Vicon-MX) motion data, respectively. Results: Pearson's correlation coefficients between the two methods were calculated, and significance tests were conducted (${\alpha}=1%$). Correlation coefficients between the two were over 0.98. In Vicon-MX and ImageJ, there is no systematic error by examination of the validity using the Bland-Altman method, and all data are in the 95% limits of agreement. Conclusion: In this study, correlation coefficients are generally high, and the regression line is near the identical line. Therefore, it is considered that motion analysis using ImageJ is a useful tool for evaluation of human movements in various research areas. Application: This result can be utilized as a practical tool to analyze human performance in various fields.

• Korean Journal of Computational Design and Engineering
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• v.21 no.3
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• pp.306-312
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• 2016

In general, the shape of a 3D printed object is not to be changed after the generation. Most changes, for example, contraction of a molten polymer after cooling is thought to be undesirable. 4D printing however tries to make benefit of a shape change after the part is generated. The shape change is required to be controllable in response to an external stimuli. These artifacts from 4D printing are called kinetic components which are defined as structures formed by combining inert materials and smart materials that change under certain stimuli. We propose a design software that can systematically calculate inert links with smart joints to follow the shape of the target design.

• Korean Journal of Cleft Lip And Palate
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• v.6 no.2
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• pp.91-105
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• 2003

There are significant limitations in the precision of mandibular distraction in setting a desired occlusal and facial esthetic outcome. The purpose of this study is to present the simulation method for the distraction osteogenesis treatment planning. 3-D surgery simulation software programs V-works and V-Surgery(Cybermed, Seoul, Korea) were used from the 3D CT data in addition to the conventional data facial photography, panorama and cephalogram, dental cast model. We have utilized already for the various surgical procedures to get information preoperatively for the maxillofacial surgery like cancer localization and reconstructive surgery, orthognathic surgery and implant surgery in the department of Oral and Maxillofacial surgery, Seoul National University Hospital. On the software, bone cutting can be done at any place and any direction. Separated bone segment can be mobilized in all 3 dimensional direction. After the 3D simulation on the software program, mock surgery on the RP model can be performed. This planning method was applied to two hemifacial microsomia patients. With this protocol, we could simulate the movement of bony segment after maxillofacial distraction osteogenesis

• International journal of advanced smart convergence
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• v.11 no.3
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• pp.49-55
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• 2022

Hair styling has a significant influence on human social perception. An increasing number of people are learning hair styling and obtaining hair designer licenses. However, it takes a considerable amount of money and time to learn professional hairstyle and beauty techniques for hair styling. Since COVID-19, there has been a growing need for offline and video lectures due to the decline in onsite training opportunities. This study provides a field practice environment in which real hair beauty is performed in a virtual space. Further, the hairstyle that is most similar to the user's hair taken with a webcam or mobile phone is determined through an image matching system using the speeded up robust features (SURF) method. The matching hairstyle was created into a three-dimensional (3D) hair model. The created 3D hair model uses a head-mounted display (HMD) and a controller that enables finger tracking through mapping to reproduce the haircutting scissors' motion while providing a feeling of real hair beauty.