• The Journal of the Convergence on Culture Technology
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• v.9 no.4
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• pp.409-414
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• 2023

We described how to implement character expressions and animations that play an important role in expressing emotions and personalities in low-polygon character animation. With the development of the video industry, character expressions and mouth-shaped lip-syncing in animation can realize natural movements at a level close to real life. However, for non-experts, it is difficult to use expert-level advanced technology. Therefore, We aimed to present a guide for low-budget low-polygon character animators or non-experts to create mouth-shaped lip-syncing more naturally using accessible and highly usable features. A total of 8 mouth shapes were developed for mouth shape lip-sync animation: 'ㅏ', 'ㅔ', 'ㅣ', 'ㅗ', 'ㅜ', 'ㅡ', 'ㅓ' and a mouth shape that expresses a labial consonant. In the case of facial expression animation, a total of nine animations were produced by adding highly utilized interest, boredom, and pain to the six basic human emotions classified by Paul Ekman: surprise, fear, disgust, anger, happiness, and sadness. This study is meaningful in that it makes it easy to produce natural animation using the features built into the modeling program without using complex technologies or programs.

• Proceedings of the Korea Multimedia Society Conference
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• 2003.11a
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• pp.326-329
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• 2003

영상이나 이미지로부터 3차원 정보를 복원해내기 위한 기술은 컴퓨터 비젼과 그래픽스 분야에서 많은 연구의 대상이 되어 왔다. 본 연구에서는 연속적으로 획득된 여러 장의 이미지로부터 특징점을 추출한 후 그 점들로부터 프로젝티브 복원을 하고 카메라 파라메터를 계산하여 유클리디언 공간으로 변환시켜 3차원 데이터를 계산하는 방법을 구현하였다. 계산된 3차원 데이터와 가장 적합한 폴리곤을 선택하고 텍스쳐 매핑을 하는 방법을 결합하여 사실적인 3차원 모델을 생성할 수 있었다.

• Proceedings of the IEEK Conference
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• 1998.06a
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• pp.581-584
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• 1998

To obtain 3-D topography of EEG records, we propose a new method based on the polygon mapping technique. The method has the low complexity to calculate the interpolation of the EEG records on the scalp and maintains the high resolution topography because the polygon technique performs the interpolation at the only vertexes of each polygon. We implemented the topographic system with 3D barycentric, 3D polynomial and spherical spline algorithms in a personal computer.

• 대한방사선방어학회:학술대회논문집
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• 2011.11a
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• pp.180-181
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• 2011

• Electronics and Telecommunications Trends
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• v.14 no.3 s.57
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• pp.19-30
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• 1999

컴퓨터 그래픽스를 이용하여 3차원 물체를 모델링하는 방법은 그 이론적 배경에서 크게 두 가지로 나뉘는데, 직선들과 삼각형 혹은 사각형들을 연결하는 폴리곤 모델링 방법과 NURBS(Non Uniform Ra-tional B-splines)라는 수학적으로 정의된 곡선 혹은 곡면을 이용하는 방법이 있다. 본 고는 이미 상용화되어 사용되고 있는 몇 가지 3차원 모델링 소프트웨어들의 기능 중에서 NURBS 모델링 기능을 살펴보고 이를 비교.분석해 본다.

• Proceedings of the Korean Information Science Society Conference
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• 2002.10d
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• pp.430-432
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• 2002

위성기술의 발달로 대규모의 고해상도 지형정보 생성이 가속화되고, 사실적 지형묘사 요구는 더욱 높아지고 있으므로 대규모 지형자료를 효율적으로 처리하여 실제감을 주는 고 충실도 렌더링 기법이 필수적이다. 본 연구에서는 지형 셀의 쿼드트리 구조를 기반으로 지형특성을 고려한 고속의 시계범위 컬링기법, 시각 거슬림 현상을 최소화하기 위한 연속적인 다단계 상세도 기법 및 기하모핑 기법, 일정한 폴리곤 수에 맞도륵 렌더링하는 프레임 균일화 기법 및 텍스쳐 관리기법 등의 효율적인 장면처리 기법을 제안한다.

• Proceedings of the Optical Society of Korea Conference
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• 2003.07a
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• pp.74-75
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• 2003

안구는 외막, 중막, 내막, 등으로 이루어져 있고, 그 중에서 가장 중요한 부분의 망막이다. 망막은 외부 물체에서 오는 빛을 받아 그 양을 정량적으로 분척하여 뇌로 보내는 역할을 한다. 이로 인해서 망막이 손상되면 눈에 치명적인 영향을 주어 자칫 시력을 잃을 수 있다. 안과에서 의사들은 정확한 병명을 진단하거나 안전한 수술을 하기 위해서 명확한 망막의 상을 얻어야 한다. 본 연구는 공초점 방식으로 망막 영상을 획득하기 위한 연구로써, 폴리곤 미터, 갈바노 미터 등의 복잡한 광학적 시스템이 제안되었다. (중략)

• Spatial Information Research
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• v.20 no.2
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• pp.117-127
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• 2012

The purpose of this study is to develop the auto-building algorithm of the Geometric Network Model(GNM), a topology model including geometric information because of the need to reflect the features' geometric characteristic into the topology model, which is for development of indoor 3D virtual model enabling queries. As the critical algorithm, the Straight Medial Axis Transformation(SMAT) algorithm is proposed in order to automatically extract the medial axis of features. The SMAT algorithm is generalized from the existing S-MAT algorithm and a range of target features where applicable is extended from simple polygons to weakly simple polygons which mean the polygons containing the inner ring inside. The GNM built automatically is finally printed out as the .csv file for easy access and w ide application in other systems. This auto-building algorithm of the GNM is available for plenty of cases such as finding a shortest path, guiding a route in emergency situation, and semantic analysis.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.21 no.6
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• pp.1225-1230
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• 2017

3D printers have been growing mainly in industrial use, but the recent growth of the personal 3D printer market advanced through economic effects and cost reduction due to technological development. However, current 3D personal printers are very low in customer satisfaction on the limitations of molding speed, size, and precision. In this paper, we propose SLA 3D printer using LSU to overcome the technical limitation of personal 3D printer. In order to verify the operation of the scanning mechanism which is responsible for core functions, the movement of molding board using stepping motor and laser output test was conducted. These tests ensure that the laser was operating and control well was confirmed that a certain point is output to the X-axis by means of a laser module and a polygon mirror. 3D printers which are proposed to improve the accuracy and manufacturing speed is expected to replace the traditional low-budget 3D printer.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2007.05a
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• pp.859-865
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• 2007

This paper presents a method to analyze the unbalance response of a high speed polygon mirror scanner motor supported by sintered bearing and flexible supporting structures by using the finite element method and the mode superposition method. The appropriate finite element equations for polygon mirror are described by rotating annular sector element using Kirchhoff plate theory and von Karman non-linear strain, and its rigid body motion is also considered. The rotating components except for the polygon mirror are modeled by Timoshenko beam element including the gyroscopic effect. The flexible supporting structures are modeled by using a 4-node tetrahedron element and 4-node shell element with rotational degrees of freedom. Finite element equations of each component of the polygon mirror scanner motor and the flexible supporting structures are consistently derived by satisfying the geometric compatibility in the internal boundary between each component. The rigid link constraints are also imposed at the interface area between sleeve and sintered bearing to describe the physical motion at this interface. A global matrix equation obtained by assembling the finite element equations of each substructure is transformed to a state-space matrix-vector equation, and both damped natural frequencies and modal damping ratios are calculated by solving the associated eigenvalue problem by using the restarted Arnoldi iteration method. Unbalance responses in time and frequency domain are performed by superposing the eigenvalues and eigenvectors from the free vibration analysis. The validity of the proposed method is verified by comparing the simulated unbalance response with the experimental results. This research also shows that the flexibility of supporting structures plays an important role in determining the unbalance response of the polygon mirror scanner motor.