• Title/Summary/Keyword: modeling.

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FOFIS : Forest Fire Information Systems (FOFIS: 산불 정보 시스템)

  • 지승도
    • Journal of the Korea Society for Simulation
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    • v.8 no.2
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    • pp.13-28
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    • 1999
  • The main purpose of this paper is to design and implement forest fire information system (FOFIS) for effective prevention of forest fire using GIS, database, 3-D graphics, and simulation techniques. In contrast to conventional fire information systems that are mostly based on the 2-D graphics and analytic modeling approaches, we have proposed the cell-based modeling approaches, i.e., spatial, data, and simulation modeling approaches. The cell-based spatial modeling is proposed by eliminating the cliff effect of the typical elevation model so that it can provide realistic 3-D graphics of the forest fire. The cell-based data modeling of geography, meteorology, and forestry information is also proposed. The cell-based dynamic modeling for forecasting of the fire diffusion is developed using the variable structure modeling techniques. Several simulation tests of FOFIS performed on a sample forest area of Chungdo, Kyungsangbukdo will demonstrate our approaches.

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System Dynamics with a Agent Based Modeling Concpet (Agent Based Modeling 기법을 활용한 시스템다이내믹스 모델링)

  • Jeon, So-Yun;Lee, Hye-Jun;Kwak, Sang-Man
    • Korean System Dynamics Review
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    • v.7 no.1
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    • pp.27-49
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    • 2006
  • A system dynamics model is developed to investigate the applicability of the agent based modeling concept in the system dynamics model. The assumed problem is to forecast the size and structure of the organization with the developing market environment. The agent based modeling concept is applied to the organization part, and the other parts of the model such as market, facilities, etc. are developed with the traditional system dynamics technique. The simulation results show the agent based modeling part can be combined with the traditional system dynamics modeling with more precisions. However, the complexity increases and the simulation times are longer than those of the traditional method.

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The Hierarchical Modeling Approach for Integrating the Enterprise Activity Model (기업 액티비티 모델 통합을 위한 계층적인 모델링 접근법)

  • Jun, H.B.;Suh, H.W.
    • Korean Journal of Computational Design and Engineering
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    • v.6 no.3
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    • pp.157-168
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    • 2001
  • The description of enterprise activities is the basis fur process improvement and information system building. To describe such activities, it is necessary to model the enterprise activities from the abstraction level to the implementation level in a stepwise and integrated form. For this reason, several modeling approaches have been proposed. However, most of them lacked the stepwise or integration aspects although some of them covered overall levels. This study proposes the hierarchical modeling approach for integrating the enterprise activity model from the abstraction level to the implementation level systematically. It is composed of five modeling levels such as function level, process level, task level, document workflow level, and event flow level. This study discusses the definition and characteristics of each level and compare our modeling frame with other modeling methodologies in case study.

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An Expert System of Moulding Working for Air Intake Hose Products using 3-Dimensional Parametric Modeling Technique

  • Sang Bong Park
    • Korean Journal of Computational Design and Engineering
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    • v.3 no.3
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    • pp.168-176
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    • 1998
  • This paper deals with an application on the mould machining of air intake hose product by using 3-dimensional parametric modeling techniques. The detailed domain is the 3-dimensional product with similar shapes and different sizes which needs too much working time for preparation of modeling or machining due to making a trial and errors repeatedly. Decision making rules for selection of modeling order and technique, and for calculation of cutting conditions, and for determination of sequence and method concerning machining operations are required by interview of expert engineers in the field. The developed expert system of modeling and machining is programmed by using a user programming language under the CAD/CAM software of the Personal Designer. The developed system that aids a mould engineer who is working in the modeling and machining section which deal with air intake hose product provides strong and useful capabilities.

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Research on the Correlation between Wavy Modeling of Garment and Fabric Properties

  • Wenbin, Zhang;Wu, Tuo;Jingru, Liu
    • Journal of Fashion Business
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    • v.8 no.6
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    • pp.1-14
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    • 2004
  • On the basis of garment spatial configuration technology, the correlation of fabric properties and garment modeling was studied in this paper. With abundant experimental data, practical modeling and the judgment of fabric properties and physical shape, we analyzed the change rules that restricting all kinds of parameters of fabric properties and garment modeling, and discussed the relation of wavy modeling and all correlated factors of fabric properties. The result showed the basis of choosing fabric for different style garment, which would help designers choosing fabric for modeling design or structure design.

Considerations in Space Allocation Methods of Emission from Area and Mobile Sources (면/이동오염원 배출량 공간 할당방식에 대한 고찰)

  • Kim, Hyun-Goo
    • Journal of Environmental Science International
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    • v.11 no.7
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    • pp.697-703
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    • 2002
  • In the present study, space allocation methods of pollutant emission from area and mobile sources are assessed by the actual application to air quality modeling of Pohang area. It is found that the TM-based modeling which allocates emission onto the 1km x 1km sized TM-grid system predicts almost the same mean ground-level concentration as that by the GIS-based modeling which uses geographical information of area and mobile sources directly, while maximum ground-level concentration by the TM-based modeling is predicted considerably lower than that by the GIS-based modeling. Moreover, the problem is found that the TM-based modeling causes deviation of mobile roads. In conclusion, it is anticipated to applying GIS-based modeling for a more accurate assessment of air quality in local scale.

Creation Techniques of UV Nodes Needed in Maya 3D Modeling Convert (마야 3D모델링 변환에 필요한 UV노드 생성기법)

  • Kim, Hyun-Mun;Song, Teuk-Seob
    • Proceedings of the Korea Contents Association Conference
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    • 2008.05a
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    • pp.534-538
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    • 2008
  • Maya currently is used form various area in 3D graphics. Maya provide that modeling methods are NURBs, Polygon, and Subdivision. There are special feature their modeling method. So we need to modeling convert. After modeling convert, there is no UV node. In this paper, we study creating techniques UV node which NURBs modeling convert Subdivsion modeling. Moreover, we present prototype implementation.

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Finite Element Analysis for Performance Evaluation of Type III Hydrogen Pressure Vessel for the Clean Tech Fuel Cell Vehicles (친환경 연료전지 자동차용 Type III 수소 압력용기의 구조성능 평가를 위한 유한 요소 해석)

  • Son, Dae-Sung;Chang, Seung-Hwan
    • Journal of the Korean Society for Precision Engineering
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    • v.29 no.9
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    • pp.938-945
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    • 2012
  • To design and estimate material failures of Type III pressure vessels, which have excellent stability and performance, various modeling techniques have been introduced. This paper provided a hybrid modeling technique composed of ply-based modeling for a cylinder part and laminate-base modeling technique for a dome part for enhancing modeling efficiency. The ply-based modeling technique provided accurate ply stresses directly for predicting material failure, on the other hand, additional manipulations in stress calculations, which may cause some errors, were needed for the case of the laminate-based modeling technique. The ply stresses in fiber, transverse and in-plane shear directions were compared with the corresponding material strengths to predict material failure.

The Study of Framework Model for Software Productivity Enhancement in Object-Oriented Environment (객체지향 환경에서 소프트웨어 생산성 향상을 위한 프레임워크 모델 연구)

  • Heo, Kwae-Bum;Kim, Young-Gyu;Yang, Dong-Il
    • Journal of Advanced Navigation Technology
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    • v.14 no.6
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    • pp.900-908
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    • 2010
  • Recently, OOM(Object-Oriented Method) access method which begins to apply to software development is emphasizing development cost and time reduction through independent software reuse. But because of planning to the exclusion of the lack of knowledge and expansion or performance for development technology many problems are coming out. Therefore, this thesis suggests Effective Object-Oriented Modeling methods considering the plan for higher productivity enhancement of software in the software development life cycle. Effective Object-Oriented Modeling method includes, methods, Use Case modeling methods, Analysis Modeling methods, Design Modeling methods and others.

Hair Segmentation using Optimized Fully Connected Network and 3D Hair Style

  • Kim, Junghyun;Lee, Yunhwan;Chin, Seongah
    • International Journal of Advanced Culture Technology
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    • v.9 no.4
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    • pp.385-391
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    • 2021
  • 3D modeling of the human body is an integral part of computer graphics. Among them, several studies have been conducted on hair modeling, but there are generally few studies that effectively implement hair and face modeling simultaneously. This study has the originality of providing users with customized face modeling and hair modeling that is different from previous studies. For realistic hair styling, We design and realize hair segmentation using FCN, and we select the most appropriate model through comparing PSPNet, DeepLab V3+, and MobileNet. In this study, we use the open dataset named Figaro1k. Through the analysis of iteration and epoch parameters, we reach the optimized values of them. In addition, we experiment external parameters about the location of the camera, the color of the lighting, and the presence or absence of accessories. And the environmental analysis factors of the avatar maker were set and solutions to problems derived during the analysis process were presented.