• Korean Journal of Remote Sensing
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• v.34 no.6_1
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• pp.1009-1024
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• 2018

With the increased use of LiDAR (Light Detection and Ranging) that can obtain over millions of point dataset, methodologies for efficient search and dimensionality reduction for the point cloud became a crucial technique. The existing octree-based "parametric algorithm" has proved its efficiency and contributed as a part of PCL (Point Cloud Library). However, the implementation of the algorithm on GPU (Graphics Processing Unit) is considered very difficult because of structural constraints of the octree implemented in PCL. In this paper, we present a method for the parametric algorithm on GPU environment and implement a projection of the queried points on four directions with an improved noise reduction.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.33 no.6
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• pp.351-358
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• 2020

This paper presents a tuned mass damper (TMD) utilizing a parametric design technique to reduce the dynamic responses to seismic loads of retractable large spatial structures. An artificial intelligence algorithm was developed to automatically search for the installation position of the damping device. This enables confirming the dynamic response of the structure in real time while finding the optimum position for the damping device. Further, the optimum mass of the damping device is determined from among several alternatives, and a design that can be effectively applied to both open and closed conditions of the roof is obtained.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2008.11a
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• pp.573-574
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• 2008

• 시스템엔지니어링워크숍
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• s.1
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• pp.54-59
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• 2003

A parametric cost estimation has a somewhat problem in the application of Korean defence acquisition program environment. In this paper, it is presented the solution suitable in the environment. The analysis is performed to the PRICE model and Korean defense industry cost accounting. Then, the scheme to solve such problems is presented is terms of data management and appropriate for usage.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 1998.10a
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• pp.18-18
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• 1998

현재 대형 조선소에서는 선박에 사용하고 있는 수많은 부재들을 고가이고, 고급인력을 필요로 하는 WORK-STATION에서 구동되는 대형의 선박전용 프로그램 등에 의하여 부재생성 및 네스팅을 하고 있다 그러나 중소형 조선소의 경제적, 기술적인 사정으로 고가의 장비와 고급인력의 확보가 어려운 실정이다. 따라서 본 연구에서는 널리 보급되어 있는 PC에서 사용 가능한 파라매트의 매크로에 의한 부재생성과 부재의 스트리핑 프로그램을 개발하였다. 본 논문의 주요 내용은 다음과 같다. 첫째, 파라매트릭 매크로기법을 이용하여 빠르고 정확하게 스티프너를 생성하기 위하여 라이브러리를 구축하고, 생성된 스티프너를 확인할 수 있는 프로그램을 개발하였다. 둘째, 스티프너들을 강재의 효율이 좋게 배치하기 위하여 AUTO, INSERT, DELETE, MOVE 기능이 포함된 자동배치 프로그램을 개발하였다. 셋째, 구축된 부재외형들을 라이브러리에 등록하고, 생성된 부재와 강재에 배치된 부재들의 관리를 위하여 데이터베이스 프로그램을 개발하였다. 개발된 프로그램에 의하여 중소형 조선소에서도 컴퓨터에 의한 정확한 부재의 생성과 부재의 자동배치에 의하여 강재수율을 높일 수 있을 것으로 사료된다.

• Bulletin of the Society of Naval Architects of Korea
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• v.30 no.4
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• pp.27-32
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• 1993

본 연구에서는 첫째로, 자체적으로 정립한 시스템 개발방법론인 객체지향 기술을 적용하여 선 체설계 전산시스템의 요구사양 및 기능분석을 수행하여, 유닛모델 개념(선체의 각 부분에서 보 여지는 특징적인 구조를 유닛으로 하고 선체구조정보를 설계변수화하여 파라메트릭 설계기법을 이용하여 모델링하는 방법임)의 초기 선체 모델링기법을 제시하고 이를 검증하므로써, 유조선 화물창부의 초기 모델링을 통한 구조설계 대안의 신속한 검토와 초기물량의 정확한 산출이 가 능하도록 하였다. 둘째로, 모델링 기술 분야에서는, 선박제품 모델링을 위한 기반 기술로써(여 기서, 제품모델링이란 최근 CAD/CAM 및 CIM 분야에서 거론되는 기술분야로서, 설계 및 생산의 대상이 되는 제품의 제반정보를 전산기 내에서 모델로써 표현하고자 하는 시도임) 선박 제품 모델의 표현방법론과 내부처리 기법을 정의하였고, 이 방법론에 다라 객체지향 구\ulcorner배치 프로 그램(OO_COMDEF)을 개발하여 본 연구에서 제시한 제품모델의 표현방법론을 검증하였다. 셋 째로 응용 프로그램 개발 분야에서는 선체 상세설계를 지원할 수 있는 시스템 설계를 수행하 였고, 이를 토대로 이중선체 유조선의 화물창부의 Hopper Tank부의 Stiffener 배치를 자동적으로 생성할 수 있는 시험용 프로그램을 개발하여 그 개념을 검증하였다.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.38 no.10
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• pp.1139-1145
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• 2014

Creation of a human skeleton model and characterization of the variation in the bone shape are fundamentally important in many applications of biomechanics. In this paper, we present a parametric shape modeling method for femurs that is based on extracting the main parameter of variations of the femur shape from a 3D model database by using statistical shape analysis. For this shape analysis, principal component analysis (PCA) is used. Application of the PCA to 3D data requires bringing all the models in correspondence to each other. For this reason, anatomical landmarks are used for guiding the deformation of the template model to fit the 3D model data. After subsequent application of PCA to a set of femur models, we calculate the correlation between the dominant components of shape variability for a target population and the anatomical parameters of the femur shape. Finally, we provide tools for visualizing and creating the femur shape using the main parameter of femur shape variation.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.24 no.2
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• pp.193-200
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• 2011

A BOR(Boil-Off Rate) prediction model for the NO96 membrane-type LNG insulation containment filled with superlite powders during laden voyage is presented in this paper. Finite element model for the unsteady-state heat transfer analysis is constructed by considering the air and water conditions and by employing the homogenization method to simplify the complex insulation material composition. BOR is evaluated in terms of the total amount of heat invaded into LNGCC and its variation to the major variables is investigated by the parametric heat transfer analysis. Based upon the parametric results, a BOR prediction model which is in function of the LNG tank size, the insulation layer thickness and the powder thermal conductivity is derived. Through the verification experiment, the accuracy of the derived prediction model is justified such that the maximum relative difference is less than 1% when compared with the direct numerical estimation using the FEM analysis.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.40 no.2
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• pp.126-136
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• 2003

We propose a new technique to improve the parametric fault coverage of oscillation test method (OTM). The OTM has been popular as a vectorless scheme for analog circuit test, both as a general defect-oriented technique, as well as an oscillation built-in self- test (BIST) scheme. However, it still requires improvement in several aspects. This paper analyzes the limitation of OTM, and proposes new signature analysis scheme to improve its performance.

• Journal of the Korea Society for Simulation
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• v.14 no.1
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• pp.43-53
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• 2005

We developed the module of the software that robot designers can perform their work faster and more easily. The parametric modeler is founded on the virtual robot design program. The virtual robot design program is the powerful software which may be used to solve various problems of robot kinematics and dynamics. The parametric modeler in the software we developed is that all the positions of joints and links are changed automatically when the designer changes one joint or one link in the robot system. Without parametric method, robot-designers must change all the positions of connected joints and links. It might become time-consuming. However, it is very efficient for designers to use the method of batch-processing in performing design-changes of robot-links using the parametric modeler.