• 동력기계공학회지
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• 제9권4호
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• pp.45-50
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• 2005

Characteristics of flows at T-junction duct with and without orifices are investigated in this paper. Experiments and PIV visualization were carried out for several flow rates. Two-dimensional PIV experimental apparatus was decided by numerical analysis. PIV visualization was also coded to visualize flow fields at junctions for two-dimensional case. For the PIV visualization system, Grey-Level Cross-Correlation particle tracking algorithm was used to calculate the flow fields. Vinyl chloride polymer particles of $100{\sim}150{\mu}m$ of diameter are used in this visualization. The PIV visualization results showed relatively good agreement with Experimental data.

• 한국가시화정보학회지
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• 제4권2호
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• pp.3-5
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• 2006

Recently, the next-generation advanced flow visualization techniques such as holographic PIV, aynni.c PIV, echo-PIV, micro/nano-PIV, and X-ray PIV have been introduced. These advanced mea-surement techniques have a big potential as the core technology for analyzing outmost thermo-fluid flows in future. They would be indispensable in solving complicated thermo-fluid flow problems not only in industrial fields such as automotive, space, electronics, aero- and hydro-dynamics. steel, and information engineering, but also in the research fields of medical science, bio-medical engineering, environmental and energy technology etc. Especially, NT (Nano Technology) and BT (Bio Technology) strongly demand these advanced measurement techniques, because it is impossible for conventional measurement methods to observe the nano- and bio-fluidic flow phenomena. In this article, the basic principle of these high-tech flow visualization techniques and their practical applications which cannot be resolved by conventional methods, such as blood flows in a micro-tube, in vivo analysis of micro-circulation, and flow around a living body are introduced as a blue ocean strategy.

• 융합보안논문지
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• 제16권5호
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• pp.41-48
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• 2016

본 논문은 플로우 시각화 기반의 네트워크 보안 상황 감시 방법인 VisFlow를 제안하며, 기존 트래픽 플로우 시각화 기술의 단점인 대량 트래픽 발생 시의 직관성 상실 문제, 대칭적 주소 공간에 의한 반사현상 문제, 종단간 연결 의미의 상실 문제를 해결하고자 한다. VisFlow는 단순하고 효율적인 보안 시각화 인터페이스로써 플로우 시각화 기술을 활용하여 개별적인 트래픽 데이터들에서는 볼 수 없었던 다양한 네트워크 현상들을 패턴으로 형상화하고 관리 네트워크 내의 보안 상황을 실시간으로 분석 및 감시하는 방법이다. 트래픽 플로우의 포트 역할 분석 방법을 이용하여 노드 유형과 중요 정보를 식별 분류하고, 분류된 정보는 중요도에 따라 2D/3D 공간 상에 단순화 및 강조하여 표시함으로써 직관성과 실용성을 높인다. 또한, IP주소값에 기반한 비대칭적 노드 배치를 통해 반사현상 문제를 해결하고 노드간의 연결선을 활용하여 종단간의 세션 의미를 유지함으로써 정보성은 높인다. 관리자는 VisFlow를 통해 방대한 트래픽 데이터를 쉽게 탐색하고 전체 네트워크 상황을 직관적으로 파악함으로써 네트워크 보안 상황을 효과적으로 감시할 수 있다.

• 한국정보과학회논문지:소프트웨어및응용
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• 제30권7_8호
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• pp.696-702
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• 2003

본 논문에서는 자바 프로그램의 예외 전파 경로를 추정하기 위한 집합 기반 분석을 제시하고 분석 결과를 이용하여 예외 전파 경로를 시각적으로 보여주는 시각화기를 제시한다. 본 논문에서는 예외 전파 분석기 및 시각화기를 구현하였다. 프로그래머는 시각화기를 이용하여 예외 전파 경로를 따라가면서 처리되지 않는 예외들을 감지하고 예외들을 보다 효과적으로 처리할 수 있다.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회A
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• pp.625-630
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• 2008

In the manufacturing industries, viewing CAE analysis results is frequently required during the product development process for design verification. CAE data which include all related information of an analysis is, however, not efficiently shared among designers because CAE data size is in general large to deal with. In order to increase collaboration among designers this paper introduces the development of a CAE visualization system based on JT format exploiting for a large model visualization with a scene graph-based toolkit. Since CAE analysis results and JT format have different structure we developed a translator to convert the CAE result in binary format to the JT format. To show the effectiveness of JT format in showing the CAE result we also developed a prototype viewer offering basic functions provided by commercial systems. By using JT format we are able not only to reduce the size of analysis results, but to store a series of analysis results with several LOD in a data file.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2010년 춘계학술대회논문집
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• pp.347-351
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• 2010

In this paper, our effort to apply 3-D Virtual Reality system for stereoscopic visualization of flow data is briefly described. This study is an extension of our previous and on-going research efforts to develop DATA(Data Analysis and Visualization Application) program, which is a data visualization program developed by using Qt as GUI development environment and OpenGL as graphic library. The program is developed upon the framework of object-oriented programming and it was originally developed by using Qt 3.3.3 environment. In this research the program is converted into a Qt 4.3.3-compatible version, and this new version is developed on Visual Studio 2005. And to achieve a stereoscopic viewing capability, two graphic windows are used to render its own viewing image for the lift and right eye respectively. These two windows are merged into one image using 3D monitor and the viewers can see the data visualization results with stereoscopic depth effects by using polarizing glasses. In this paper three dimensional data visualization with stereoscopic technique combined with 3D Monitor is demonstrated, and the current achievement would be a good start-up for further development of low-cost high-quality stereoscopic data visualization system.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2012년도 추계학술대회 논문집
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• pp.517-518
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• 2012

• 한국해양공학회지
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• 제22권5호
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• pp.126-131
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• 2008

The voyage data is very important for safety of ships, and duty being effectuated by the installation of voyage data record (VDR) on ships. VDR is a black-box, and it contains 14 kinds of voyage data as text. But it is not easy to understand when the accident happened because voyage data is saved as complicated texts. User interface (UI), analysis, visualization system, which works for assist to gather information about situation of accident, was developed. It will be possible to develop onboard ship monitoring and voyage prediction system by the VDR visualization system's development in near future.

• 한국군사과학기술학회지
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• 제5권3호
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• pp.33-44
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• 2002

In this study, 3-dimensional virtual visualization was performed for a rapid and accurate analysis of sea bottom topography. The visualization was done through the extracted data using the developed program and the generated data using the gridding method. The data extraction program was developed with AutoLISP programming language and this program was able to extract the needed sample bathymetry data from the electronic sea chart systematically as well as effectively The gridded bathymetry data were generated by the interpolation or extrapolation method from the spatially-irregular sample data. As the result of realization for the 3-dimensional virtual visualization, it was shown a proper feasibility in the analysis of the sea bottom topography to determine the route of submarine cable burial.

• International Journal of Air-Conditioning and Refrigeration
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• 제14권2호
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• pp.76-83
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• 2006

An efficiency of a refrigeration cycle and a reliability of a compressor can be reduced if a refrigerant including excessive lubricating oil is exhausted from the compressor. Thus, the analysis of the oil behavior inside the compressor is required to prevent the problem. A tested rotary compressor with visualization windows has been manufactured. in this study to investigate the oil behavior using developed visualization techniques. The oil behaviors at various operating conditions have been quantified to obtain the relationship with the outlet pressure inside the compressor. Also, the effect of the operating conditions on the quantity of the exhausted oil from the rotary compressor has been investigated using a manufactured test model.