• Title, Summary, Keyword: 2-D simulation

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Combined 1D/2D Inundation Simulation of Riverside Farmland using HEC-RAS (HEC-RAS를 이용한 하천변 농경지의 1, 2차원 연계 침수 모의)

  • Jun, Sang Min;Song, Jung-Hun;Choi, Soon-Kun;Lee, Kyung-Do;Kang, Moon Seong
    • Journal of The Korean Society of Agricultural Engineers
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    • v.60 no.5
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    • pp.135-147
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    • 2018
  • The objective of this study was to analyze the characteristics of combined 1D/2D inundation simulation of riverside farmland using the Hydrologic Engineering Center - River Analysis System (HEC-RAS). We compared and analyzed inundation simulation results between 1D and combined 1D/2D hydraulic simulation using HEC-RAS. Calibration and validation of stream stage were performed using three rainfall events. The coefficient of determination ($R^2$) and root mean square error (RMSE) between simulated and observed stream stage were 0.935 - 0.957 and 0.250 m - 0.283 m in calibration and validation, respectively. The inundation area showed no significant difference in 1D and combined 1D/2D simulation ($8.48km^2$ in 1D simulation, $8.75km^2$ in combined 1D/2D simulation). The average inundation depth by 1D simulation was 1.4 m deeper than combined 1D/2D simulation. In the lower inundation depth, the inundation area by combined 1D/2D simulation was larger than inundation area by 1D simulation. As the inundation depth increased, the inundation area by 1D simulation became wider. In the case of the 1D/2D combined simulation, low elevation areas along the river bank were inundated widely. Compared to 1D/2D combined simulation, the flood radius in some sections was longer in 1D simulation. In the 1D analysis, because the low altitude riverside farmlands are also assumed to stream, it is calculated that riverside farmlands have the same stage as the mainstream when the stream is overflowed. Therefore, the inundation area seems to be overestimated in those sections. In other regions, the inundation areas tend to be broken depending on overflow by each stream cross-section. In the case of river flooding, the overflow is expected to flow to the lower area depending on the terrain, such as the results of the combined 1D/2D simulation. It is concluded that the results of combined 1D/2D inundation simulation reflected the topographical characteristics of low-lying farmland.

Accuracy of Maxillary Segmental Osteotomy using 3D Simulation: A Case Report

  • Lee, Yong Bin;Yeo, Gisung;Jung, Young-Soo;Jung, Hwi-Dong
    • Journal of International Society for Simulation Surgery
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    • v.2 no.2
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    • pp.71-75
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    • 2015
  • To overcome limitations of conventional diagnosis and planning for orthognathic surgery, surgeons have begun to use 3-dimensional (3D) virtual simulation to plan complex orthognathic surgery. In many literatures, it has shown that better surgical outcome achieved with 3D virtual simulation than that with conventional methods. But, there is still lack of data about accuracy of maxillary segmental surgery with 3D virtual simulation. The purpose of this paper was to report the case of maxillary segmental orthognathic surgery with 3D virtual simulation and to assess the actual surgical outcome. Though the result was clinically acceptable, discrepancy between 3D simulation and actual surgery was not superior compared with conventional method. The accuracy of 3D simulation surgery and intermediate wafer fabrication for maxillary segmental surgery needs to be improved. Advancement in 3D software program and careful surgical technique will make it more precise and reliable method.

Implementation of an User Interface Developing Tool for 3D Simulator (3차원 시뮬레이터의 사용자 인터페이스 개발 도구 구현)

  • Yoon, Ga-Rim;Jeon, Jun-Young;Kim, Young-Bong
    • Journal of Korea Multimedia Society
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    • v.19 no.2
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    • pp.504-511
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    • 2016
  • 3D simulation programs or games on a smart phone and a personal computer have often employed 3D graphic processing techniques and 3D graphical views. However, the user interfaces in those 3D programs have sticked to take a typical 2D style user interface and thus the combination of a 2D user interface view and a 3D simulation view give us a mismatched sense. Since a 2D user interface has been based on the windows controls, it causes sometime DC conflicts between a simulation view and an interface view. Therefore, we will implement the UI developing tool which can be inserted into the pipeline structure for the development of a 3D simulation software and also follows the view-handler design pattern in Microsoft windows system. It will provide various graphical effects such as the deformation of UI depending on the view direction of simulation view and the sitting pose of user. This developing tool gives the natural user interface which heightens the sense of unity with a given 3D simulation view.

Automated Generation of a Construction Schedule Based on the Work Method Template for 4D Simulation (4D 시뮬레이션을 위한 공법 템플릿 기반의 건설공정 자동 생성)

  • Song, Sung-Yol;Yang, Jeong-Sam;Myung, Tae-Sik
    • IE interfaces
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    • v.25 no.2
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    • pp.216-228
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    • 2012
  • BIM-based 4D simulation makes people easily understand complex construction process using 3D graphics model and helps them review and identify the construction schedule in each phase of the construction process. Moreover, 4D simulation can be used as reference data to determine the validity of the process in the design phase and will be utilized as a measure for checking the construction process. Therefore 4D simulation of construction improves efficiency of project management. However, current commercial applications available for 4D simulation do not provide sufficient functions for connection of 3D models and process information. In this paper, we propose an automated generation method through the definition of the process based on a work method template and developed the template based schedule generation system (TSGS).

Simulation of Sediment Deposition Behavior in a Reservoir using a SED2D model: Focusing on Sensitivity of Simulation Time Step (SED2D모형을 이용한 저수지 퇴사거동 모의-모의시간간격의 민감도를 중심으로)

  • Kim, Dae Guen
    • Journal of Korean Society of Water and Wastewater
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    • v.26 no.1
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    • pp.87-95
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    • 2012
  • In this study, the following conclusions were obtained from an investigation of the effect of the simulation time step on the simulation results of the two-dimensional, vertically averaged sediment transport model SED2D and an analysis of the deposited sediment distribution in suspended sediments of reservoirs according to grain size. The simulation time step has a significant effect on the deposited sediment distribution in a reservoir. In particular, if the simulation time step is set to be excessively large, physically invalid results are obtained. Additionally, in order to determine an appropriate simulation time step for SED2D, the selection of a simulation time step that will allow the analysis of the suspended sediment concentration profile at the main points of the simulation domain is necessary. The deposited sediment distribution in a reservoir according to grain size, including suspended sediments of clay, silt, and sand, was successfully simulated. Such information will prove valuable in application to the establishment of efficient management and reduction measures of reservoir sediment deposits.

A Study of the Adaptation of 2-Dimensional Hair-Style Computer Simulation and Prospects of the 3D System (2D 헤어스타일 시뮬레이션 현황과 3D 시스템 도입방향에 관한 연구)

  • HwangBo, Yun;Ha, Kyu-Soo
    • Journal of the Korea Society of Computer and Information
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    • v.13 no.7
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    • pp.221-229
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    • 2008
  • The development of computer and multimedia brought out new technology, that is, virtual reality. Computer simulation adaptation among the technologies of the virtual reality is spreaded into air service, motor vehicle, medical science, sports, education, even fashion industry. This study look into 2-dimensional hair-style computer simulation system which is started to common use nowadays and the 3-dimensional system which is under the development. And this study proposed several problems such as heavy 3D system booth and the low price but low qualified camera in order to commercialize the 3D system. This study also suggest several alternative, for instance, the change from object photography method to panoramic photography method, the substitute by middle or high end and high qualified camera.

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A Study on Based on the Possibility of Quantitative Analysis using Virtual Clothing Simulation according to Raglan Sleeve Pattern Types (가상 착의 시뮬레이션을 이용한 래글런 소매 패턴 변화에 따른 착의 시 정량적 분석 가능성 모색)

  • Lee, Ye-Jin;Lee, Byung-Cheol
    • Korean Journal of Human Ecology
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    • v.21 no.2
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    • pp.299-314
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    • 2012
  • The purpose of this study was to explore effects of pattern alteration using a virtual clothing simulation approach in combination with 3D analysis software. Three raglan sleeves of different patterns were worn by an avatar using virtual clothing simulation with silk and cotton as the test fabrics. It was observed that the silhouette and hemline shape were affected differently based on raglan sleeve pattern and fabric type. By examining clothing pressure distribution, the cotton fabric designs and pattern shapes provided for a variety of influences on armhole and bust regions as well as the back sleeve area. For representative locations, cross section circumstance, cross section area, and volume were measured by using 3D analysis and the resulting correlation between the 2D and 3D data were investigated. Among different fabrics, there was little difference between the 2D and 3D clothing surface area. However, when using 3D analysis, clothing volume was significantly affected by different fabrics and pattern types. By simultaneously adopting the virtual simulator and 3D analysis, quantitative assessment of virtual clothing simulation was successfully conducted. In light of the results of this study, the resulting methodology is expected to be used as a comprehensive evaluation tool for virtual clothing simulation wear testing.

Application of 3D Simulation Surgery to Orthognathic Surgery of Hemimandibular Hypoplasia

  • Park, Jin Hoo;Jung, Young-Soo;Kwon, Sun-Mo;Lim, Jae-Seok;Jung, Hwi-Dong
    • Journal of International Society for Simulation Surgery
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    • v.3 no.2
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    • pp.69-73
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    • 2016
  • Traditionally 2D cephalometric analysis has been used for diagnosis and treatment of maxillofacial deformities. However, 2D has some limitations in diagnosis and treatment planning especially facial asymmetry cases. The most weakness of 2D is overlapping and unpredictability. Today 3D treatment tools are used by many maxillofacial surgeons. 3D treatment tools can show ungarbled facial anatomy and do virtual surgery. The aim of this report is to present usefulness of using 3D analysis and virtual orthognathic surgery for severe facial asymmetry patients.

Development of CAMPform2D Preprocessor for Forming Process U sing Convenient Input Method (편리한 입력방식의 단조공정해석을 위한 CAMPform 2D의 Preprocessor 개발)

  • 박성균;이상헌;이강수
    • Korean Journal of Computational Design and Engineering
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    • v.9 no.2
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    • pp.133-142
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    • 2004
  • CAMPfonn2D is a Finite Element Method (FEM) based process simulation system designed to analyze two dimensional (2D) flow of various metal forming processes. It enables designers to analyze metal forming processes on the computer rather than the shop floor using trial and error and provides vital information about material and thermal flow during the forming process to facilitate the design of products. CAMPfonn2D can be used by companies, research institutes and industrial applications to analyze forging, extrusion, drawing, heading, upsetting and many other metal forming processes. Also, process simulation using CAMPfonn2D can be instrumental in cost, quality and delivery improvements at leading companies. Today's competitive pressures require companies to take advantage of every tool for rapid manufacturing of well-designed product. So, the preprocessor of simulation program must be easy to use to speed-up design. In this paper, we introduce new version of Preprocessor and show how easy to use it. And, Preprocessor will prove itself to be easy and extremely effective.