• Journal of Advanced Navigation Technology
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• v.13 no.1
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• pp.142-150
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• 2009

It is very important to generate a simplified model from a complex 3D character in computer game. We propose a new method of extracting feature lines from a 3D game character. Given an unstructured 3D character model containing texture information, we use model feature map (MFM), which is a 2D map that abstracts the variation of texture and curvature in the 3D character model. The MFM is created from both a texture map and a curvature map, which are produced separately by edge-detection to locate line features. The MFM can be edited interactively using standard image-processing tools. We demonstrate the technique on several data sets, including, but not limited to facial character.

• CDE review
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• v.16 no.1
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• pp.34-39
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• 2010

• Transactions of the Korean Society of Mechanical Engineers A
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• v.39 no.11
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• pp.1191-1198
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• 2015

In this paper, we develop simplified finite element (FE) models for butt-, lap- and T-welded joints by performing numerical and experimental experiments. Three-point bending tests of butt- and lap-welded specimens are performed to obtain the stiffness of the specimens and the strains at points near the welding beads. Similarly the stiffness and strains of T-welded specimen are measured by applying a point load at the end of the specimen. To develop simplified FE models, we consider the shape parameters of width, thickness and the angle of weld elements in the numerical simulations. The shape parameters of the simplified FE models are determined by building linear regression models for the experimental data sets.

• Proceedings of the Korean Information Science Society Conference
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• 2008.06d
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• pp.196-201
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• 2008

국내에서 추진하고 있는 모바일 RFID 네트워크 서비스는 국외에서 진행하는 단순 물품의 정보에 한정되는 RFID 서비스보다 진보된 서비스이다. 이는 단순히 사물에 대한 정보 서비스가 아니라 핸드폰을 가지고 있는 사람은 모두 대상이 되는 확장성 있는 서비스를 요구한다. 이에 따라 단순 물품에 한정되는 서비스 모델은 모바일 RFID 네트워크 서비스 모델로써 사용될 수 없으며, 개인화된 정보제공을 위한 서비스 모델이 필요하다. 이에 본 논문에서는 모바일 RFID 네트워크에서 핸드폰에 RFID 태그와 리더가 장착된 환경을 가정하여 개인화된 정보제공을 위한 서비스 모델에 따라 서비스에 대한 구성과 그 실행 모델을 제시한다.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.32 no.1
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• pp.7-16
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• 2019

In this paper, for a seismic analysis of an offshore subsea manifold, Response Spectrum Analysis(RSA) and Time History Analysis(THA) were conducted under a various analysis conditions. Response spectrum and seismic design procedure have followed ISO19901-2 code. In case of THA, The response spectrum were converted into artificial earthquake history and both of Explicit and Implicit solvers were used to examine the characteristics of seismic analysis. For the verification, Various seismic analysis methods were applied on a single degree of freedom beam model and a simplified model of the actual manifold. The difference between the results of RSA and THA on the simplified manyfold model evaluated for the analysis of the actual manifold. Because THA is impossible in case of real complex structure such as a manifold, Safety of the actual manifold structure was accessed by using the RSA and the difference between the results of RSA and THA from the simplified model.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2010.10a
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• pp.308-308
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• 2010

본 논문에서는 판토그라프의 공력소음 발생 특성을 규명하기 위하여 단순 모델을 이용하여 그 특성을 분석하였다. 단순 모델은 실제 팬헤드의 사이즈를 고려하여 선정하였고, 이를 통해 음압 해석 알고리즘을 구축하고 소음 발생 메커니즘을 분석하였다. 단순 모델을 선정하여 이를 Lattice Boltzmann Method 를 기반으로 한 전산 유체 해석을 통한 결과를 이용하여 음압 레벨과 음압의 방사형태를 계산하고, 풍동 실험을 통해 이를 검증한다. 풍동 실험에서는 단순 모델을 제작하여 100 km/h 의 속도 환경에서 항력, 양력과 소음을 측정하였다. 단면의 형상에 따른 변화 추이를 검토하였으며 해석결과를 단일 수치로도 정량화하여 제시한다. 최종적으로 정립된 알고리즘을 기반으로 팬헤드의 3 차원 모델을 시뮬레이션 한 결과를 제시한다.

• Proceedings of the Korea Multimedia Society Conference
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• 2002.05c
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• pp.390-395
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• 2002

MPLS는 고속 전달, 트랙픽 엔지니어링 그리고 가상 사설망 서비스를 가능하게 한다. MPLS 레이블 스위치와 제어기 사이에서 동작하는 GSMP 프로토콜은 연결, 구성, 장애, 성능관리 및 동기화 기능을 제공하는 개방형 인터페이스 프로토콜이다. GSMP가 적용된 개형형 인터페이스의 망 관리 기능은 제어기 또는 레이블 스위치에 위치할 수 있다. 본 논문에서는 MPLS 레이블 스위치의 단순화 및 자원 이용의 효율성을 높이기 위하여 SNMP 에이전트가 제어기에 탑재되는 망 관리 모델을 제시하였다. MPLS-LSR 및 FTN MIB와 GSMP 메시지의 매핑 시나리오를 제시하였으며, 제어기의 구현을 통하여 본 논문에서 제시된 망 관리 모델의 실현성을 확인하였다.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.40 no.2
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• pp.157-165
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• 2016

In wartime conditionsmilitary combat vehicles are required to be driven on rough roads that have significant obstacles. A wheel type dog-horse robot with a rotary suspension system was applied to overcome the obstacles. To achieve real-time analysis, a simplified model was proposed by using velocity transformations. Through comparison with the multi-body dynamics model, the efficiency and accuracy of the proposed modeling was proven.

• Journal of Korea Game Society
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• v.2 no.2
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• pp.28-36
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• 2002

In general, triangular meshes have been used for modeling geometric objects such as virtual game characters. The dense meshes give us considerable advantages in representing complex, highly detailed objects, while they are more expensive for storing, transmitting and rendering the objects. Therefore, several researches have been performed for producing a high quality approximation in place of detailed objects, that is, a simplification of triangular meshes. In this paper, we propose a new measure with respect to edges and vertices, which is called an approximate mean curvature and is used as criteria to simplify an original mesh. An edge mean curvature is computed by considering its neighboring edges, and a vertex mean curvature is defined as an average of its incident edges' mean curvatures. And we apply the proposed measure to simplify the models such as a bunny, dragon and teeth. As a result, we can see that the mean curvatures can be used as good criteria for providing much better approximation of models.

• Journal of Energy Engineering
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• v.24 no.1
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• pp.69-77
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• 2015

The PMV regression analysis was conducted for this model based on a database of the PMV variables. PMV regression model simplification was completed through sensitivity and data analysis. The simplified PMV regression model's and Fanger PMV model was confirmed through MAE and RMSE. And the EMS in EnergyPlus was used to establish a simplified PMV regression analysis-based thermal comfort control. Also, the thermal comfort controls based on simplified PMV model and the Fanger PMV model were applied to the building model, it was confirmed that both controls met the thermal comfort range in more than 90% of cases during the air conditioning period.