• 한국가시화정보학회지
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• 제21권1호
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• pp.12-17
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• 2023

Aortic valve stenosis is a heart valve disease caused by the accumulation of calcium in the valve, which can divide into tricuspid aortic valve (TAV) stenosis and bicuspid aortic valve (BAV) stenosis depending on the shape of natural valve. In this study, pig heart-based TAV and BAV ex vivo models were fabricated, and the flow characteristics behind a valve were analyzed using 4D flow MRI. Flow behind normal TAV was uniformly distributed, while BAV asymmetrically opened with an eccentric strong jet. Especially, BAV ex vivo model exhibited a secondary flow in the region where the valve closed. In addition, BAV had a 26% higher peak velocity while maintaining similar stroke volume compared with normal TAV. This study would be helpful for understanding the flow characteristics for BAV AS patients.

• 한국자동차공학회논문집
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• 제9권3호
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• pp.18-26
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• 2001

This paper is the third of 3 companion papers which investigate axial stratification process. In-cylinder fuel behavior has been investigated in the port injected SI engine by visualizing for the purpose of understanding stratification. Planar laser light sheet from an Nd:YAG laser has been illuminated through the transparent quartz cylinder of the single cylinder optical engine and the Mie scattered light has been captured through the quartz window in the piston head with an ICCD camera. Fuel has been replaced with an air-ethanol mixture to utilize atomized fuel spray for the visualization purposes. This results have been compared with steady flow concentration measurement. In high swirl port, the most fuel remains at combustion chamber and upper cylinder region without being affected by injection timing. The macro-distributed state is not changed but the difference of the amount of fuel around the spark plug varies according to injection timing, which determines LML.

• 대한기계학회논문집A
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• 제30권5호
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• pp.488-495
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• 2006

The demand for the use of 3D CAD data over the Internet environment has been increased. However, transmission of 3D CAD data has delayed the communication effectiveness because of the CAD data size. Lightweight CAD file design methodology is required for rapid transmission in the distributed environment. In this paper, to derive lightweight CAD files from commercial CAD systems, a file translation system producing a native file is constructed first by using the InterOp and API of the ACIS kernel. Using the B-rep model and mesh data extracted from the native file, the lightweight CAD file with topological information is constructed as a binary file. Since the lightweight CAD file retains topological information, it is applied to the dimensional verification, digital mock-ups and visualization of CAD files. Effectiveness of the proposed lightweight CAD file is confirmed through various case studies.

• 한국가시화정보학회지
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• 제5권2호
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• pp.9-13
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• 2007

Typhoon simulation based on dynamical forecasting results is demonstrated by utilizing geodesic model GME (operational global numerical weather prediction model of German Weather Service). It is based on uniform icosahedral-hexagonal grid. The GME gridpoint approach avoids the disadvantages of spectral technique as well as the pole problem in latitude-longitude grids and provides a data structure extremely well suited to high efficiency on distributed memory parallel computers. In this study we made an attempt to simulate typhoon 'NARI' that passed over the Korean Peninsula in 2007. GME has attributes of numerical weather prediction model and its high resolution can provide details on fine scale. High resolution of GME can play key role in the study of severe weather phenomenon such as typhoons. Simulation of future typhoon that is assumed to occur under the global warming situation shows that the life time of that typhoon will last for a longer time and the intensity will be extremely stronger.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2011년도 추계학술발표대회
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• pp.467-470
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• 2011

일반 PC의 메인 메모리에 올릴 수 없는 거대 용량의 데이터의 경우 가시화를 통한 해석을 수행하는데 어려움이 많다. 본 논문에서는 이러한 거대 용량의 데이터를 실시간으로 처리하기 위한 분산 환경에서의 가시화 서버의 설계를 제안한다. 본 논문에서 제안하는 가시화 서버는 가시화 관리자, 네트워크 관리자, 데이터 관리자로 구분되며 이들 관리자를 통해 복수의 사용자에 대한 가시화 서비스 제공, 거대 데이터의 실시간 동적 데이터 분할 및 할당 및 실시간 가시화를 지원한다.

• 과학교육연구지
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• 제41권3호
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• pp.462-479
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• 2017

본 연구는 중학교 과학교과서 2종에 수록된 시각화자료들을 데이터시각화와 인포그래픽으로 나누어 분류한 후, 인포그래픽 분석틀에 따라 에너지, 물질, 생명, 지구의 과학 내용 영역별로 인포그래픽의 유형과 특징을 분석하였다. 연구 결과는 다음과 같다. 첫째, 중학교 과학 교과서에서 시각화 자료는 인포그래픽(평균 23.20%)보다 데이터시각화(평균 76.80%)에 해당하는 자료가 더 많았다. 둘째, 인포그래픽은 정보내용의 영역에서 과학 교과의 영역별로 서로 다른 특징을 보였다. 에너지와 물질 영역에서는 정보내용 중 '관계'에 해당하는 내용이 많았고, 생명 영역에서는 '기능', 지구 영역에서는 '위치'와 관련된 정보내용이 많이 나타났다. 과학 전체 영역에서 시각표현 유형은 일러스트형과 비교분석형이 주로 사용되었으며 레이아웃 유형은 수평형이 가장 많은 비율을 차지하였다. 따라서 과학교과서에서 제시하는 그림은 단순 정보를 전달하는 데이터시각화보다 인포그래픽으로 표현하여 제시할 필요가 있으며, 과학의 각 영역별로 다양한 인포그래픽 유형을 활용한 교과서 개발이 필요하다.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2011년도 추계학술대회 초록집
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• pp.59.2-59.2
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• 2011

This study presents a new method for coupling ArcGIS (popular GIS software) with TRaNsient SYstems Simulation (TRNSYS, reference software for researchers and engineers around the world) to use capabilities of the 4 and 5-parameter PV array performance models within the ArcGIS environment. Using the validated and industry-proven solar energy simulation models implemented in TRNSYS and other built-in ArcGIS functionalities, dynamic characteristics of distributed PV potential in terms of hourly, daily or monthly power outputs can be investigated with considerations of diverse options in selecting and mounting PV panels. In addition, the proposed method allows users to complete entire procedures in a single framework (i.e., a preliminary site survey using 3D building models, shading analyses to investigate usable rooftop areas with considerations of different sizes and shapes of buildings, dynamic energy simulation to examine the performances of various PV systems, visualization of the simulation results to understand spatially and temporally distributed patterns of PV potential). Therefore tedious tasks for data conversion among multiple softwares can be significantly reduced or eliminated. While the programming environment of TRNSYS is proprietary, the redistributable executable, simulation kernel and simulation engine of TRNSYS can be freely distributed to end-users. Therefore, GIS users who do not have a license of TRNSYS can also use the functionalities of solar energy simulation models within ArcGIS.

• 대한인간공학회지
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• 제30권5호
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• pp.683-688
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• 2011

Objective: The aim of this study is to develop a distributed representative human model(DRHM) generation and analysis system. Background: DRHMs are used for a product with multiple-size categories such as clothing and shoes. It is not easy for a product designer to explore an optimal sizing system by applying various distributed methods because of their complexity and time demand. Method: Studies related to DRHM generation were reviewed and the RHM generation interfaces of three digital human model simulation systems(Jack$^{(R)}$, RAMSIS$^{(R)}$, and CATIA Human$^{(R)}$) were reviewed. Results: DRHM generation steps are implemented by providing sophisticated interfaces which offer various statistical techniques and visualization methods with ease. Conclusion: The DRHM system can analyze the multivariate accommodation percentage of a sizing system, provide body sizes of generated DRHMs, and visualize generated grids and DRHMs. Application: The DRHM generation and analysis system can be of great use to determine an optimal sizing system for a multiple-size product by comparing various sizing system candidates.

• 한국컴퓨터그래픽스학회논문지
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• 제24권3호
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• pp.21-31
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• 2018

태풍, 해일, 홍수, 범람 등에 관련된 자연재난 데이터를 빠르고 효과적으로 가시화하여 재난 재해 상황에서 정확한 의사결정을 할 수 있도록 지원하는 시스템을 소개한다. 재난정보를 포함하는 데이터는 적게는 수백 MB에서 많게는 수십, 수백 GB로 구성되어 있으므로 개인이 지닌 컴퓨터로는 처리할 수 없다. 그렇기 때문에 본 시스템은 클라이언트-서버 기반의 시스템을 제공하여 고성능 서버에서 가시화 결과를 생성하고 클라이언트에서는 결과를 받아 출력하는 형태로 구현되었다. 서버는 클라이언트의 요청을 처리하고 내장된 고성능 클러스터로 렌더링된 결과를 클라이언트로 전송한다. 클라이언트는 원하는 기간을 지정하여 가시화된 결과를 이미지, 동영상, 3D 그래픽 모델 중 원하는 형태로 서버로부터 제공받아 표출할 수 있으며 사용자 친화적인 GUI와 효과적으로 가시화 결과를 볼 수 있는 다양한 기능을 사용자에게 제공한다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.1371-1373
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• 2003

The importance of Fundamental Geographical Information Framework for Digital City (FGFDC) is analysed, it provides all city agencies and units with uniform geographic references. Six kind of data are chosen as the core data sets of a FGDC, a web-based distributed mechanism is constructed to promote data sharing among different agencies. Elementary functional requirements of FGDC are analyzed, so that it can serve as a common distributed urban GIS. A practical FGFDC is developed for Yangzhou Development Administrative Region, and an 3D visualization system is developed within this framework.