• 한국데이타베이스학회:학술대회논문집
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• 한국데이타베이스학회 2008년도 연합학회학술대회
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• pp.211-224
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• 2008

As a lot of information and media are given to users in Internet space nowadays, users feel disoriented or "lost in space" intensively. So it is suggested that we have the system to reduce information overload and to propose effective and efficient information. In this study we present a visualizing technique which uses fisheye views on data adjacency to combine global context and local details for presentation of many results in limited space. Data Adjacency on graph theory is applied to set up degree of interest which is main focus in fisheye views. Graph theory is useful to solve the problem resulted from various combinational optimization, especially it has advantages to analyze issues in information space like Internet. To test the usability of the proposed visualization technique, we compared the effectiveness of different visualization techniques. Results show that our method is evaluated with respect to less time and high satisfaction for a task accomplishment.

• 한국가시화정보학회:학술대회논문집
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• 한국가시화정보학회 2002년도 추계학술대회 논문집
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• pp.117-120
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• 2002

An experimental research has been carried out for flow control of the shock wave/turbulent boundary-layer interaction utilizing aeroelastic mesoflaps. Various shapes and thicknesses of the mesoflap are tested to achieve different deflections of the flap, and ail the results are compared to the solid-wall reference case without flow-control mechanism. Quantitative variation of skin friction has been measured downstream of the interactions using the laser interferometer skin friction meter, and qualitative skin friction distribution has been obtained by observing the interference fringe pattern on the oil-film surface. A strong spanwise variation in the fringe patterns with a narrow region of separation near the centerline is noticed to form behind the shock structure, which phenomenon is presumed partially related to three-dimensional flow structures associated with both the sidewalls and the bottom test surface. The effect of the shape of the cavity is also observed and it is noticed that the shape of the cavity is not negligible.

• 한국가시화정보학회지
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• 제16권3호
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• pp.35-39
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• 2018

In multiphase systems, surface wettability is one of dominant design parameters to enhance system performance. Since surface wettability can be maximized and minimized with micro-textured surfaces, therefore micro-textured surfaces are widely countered in various research and engineering fields. In this study, for better understanding of micrometer scaled surface wettability, spreading phenomena is experimentally investigated on the hydrophilic micro-textured surfaces. By photolithography and conventional dry etching method, there are prepared the surfaces with uniformly arrayed micro-pillars. The interfacial motions of a water droplet on the test sections are visualized by high speed camera in top view. On the basis of visualization data, it is analyzed the relation between dynamic coefficient and geometrical features on micro-textured surfaces.

• 한국HCI학회논문지
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• 제12권1호
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• pp.5-13
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• 2017

발표자의 적극적인 역할과 개입은 정보시각화를 효과적으로 표현하고 전달하는 핵심 요인임에도 불구하고, 정보 시각화 연구에서 적극적으로 다루어지지 못했다. 단순히 시각화 결과만 보여주는 것이 아니라, 발표자가 시각화와 관련된 부가적인 정보 및 맥락을 함께 제공함으로써 시각화 전달 과정을 증진시킬 수 있다. 본 논문에서는 발표자가 3차원 시각화 공간에 직접 개입하여 자신을 둘러싼 공간에 표현된 정보와 직접적으로 상호작용 하면서, 정보 표현 및 전달 과정을 적극적으로 증진시킬 수 있는 방식을 제시하고 이를 증강 프레젠테이션 (augmented presentation)이라는 프레임워크로 정의한다. 증강 프레젠테이션의 특성을 구체화하기 위해서 발표자가 개입할 수 있는 시각화 공간을 디자인하고, 발표자로 하여금 관찰자와 정보 간의 의사소통 과정을 충분히 지원할 수 있도록 발표자의 역할을 화자(storyteller), 제어자(controller), 정보증강자(augmenter)로 정의했으며, 그들의 역할 가능성을 제안하였다. 또한, 증강 프레젠테이션 특성을 실제로 구현할 수 있는 프로토타입 시스템을 제작하였다. 하프미러 필름 (half-mirror film)과 일반 프로젝션 스크린을 일정 간격을 띄운 후 평행하게 위치시키고, 각 스크린에 입체 영상을 적용한 후, 발표자가 스크린 사이에 표현된 3차원 시각화 공간 내에 직접 개입하여 정보와 상호작용할 수 있는 형태이다. 이후, 초기 단계에서 몰입적 정보 표현과 정보 전달 플랫폼으로서 증강 프레젠테이션의 가능성을 확인하기 위해서 기존의 프레젠테이션 시스템과 증강 프레젠테이션 시스템을 비교하는 예비 실험 (pilot test)을 진행하였다. 그 결과, 본 연구에서 제시한 증강 프레젠테이션은 실제 3차원 공간에서 가상의 정보와 실제 발표자를 자연스럽게 통합시켜 표현함으로써 몰입적이고 관찰자의 주의를 사로잡는 프레젠테이션을 실현할 수 있는 가능성이 충분히 있음을 확인했다.

• 정보교육학회논문지
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• 제26권6호
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• pp.481-490
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• 2022

컴퓨팅 기술의 발전으로 빅 데이터 시대가 도래하게 되어 우리는 주변의 수많은 데이터와 생활하고 있다. 초등학생들도 예외는 아니다. 따라서 초등학교부터 데이터 처리하는 것을 학습하는 것이 매우 중요하다. 초등학생들은직관적인 사고를 하기 때문에 데이터를 바로 그림으로 표현하는 데이터 시각화가 중요한 학습 요소이다. 본 연구에서는 초등학생들이 생활 속의 데이터를 시각화해 봄으로써 이것이 정보 처리 역량에 얼마나 효과적인지를 연구한다. 초등학교 3학년 학생들에게 데이터 시각화 도구를 이용하여 8차시의 데이터를 조직화하고, 시각화한 후에, 상호작용의 절차를 체험하는 것으로 데이터 시각화 프로그램을 개발하였다. 개발한 프로그램을 7개 학급에 186명의 학생들에게 적용하고 수업 전과 수업 후 지식정보처리 역량 요소를 평가하였다. 사전·사후 검사를 실시한 결과 지식정보처리 역량에 유의미한 차이가 있었다. 따라서 본 연구에서 개발한 데이터 시각화 프로그램은 효과가 있다.

• 한국자동차공학회논문집
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• 제14권1호
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• pp.129-137
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• 2006

This paper studies the effects of the swirl for the variation of intake port configuration that is key parameters in the flow field of direct injection diesel engines. In-cylinder flow characteristics is known to have significant effects on air-fuel mixing, combustion, and emissions. To investigate the effects of the swirl flow, various rpm(250, 500, 750) and two different intake port were used. And to evaluate the swirl motion in the flow field visualization engine, steady state flow test was conducted. Helical port intake port and SCV(Swirl Control Valve) were selected as the design parameters to increase the swirl flow and parametric study was performed. In the case of non-SCV, intake flow rate and non-dimensional swirl ratio were higher than those of SCV for the swirl head type. So, we could strengthen the swirl in the flow field with the swirl head type and don't using SCV. From the results of steady state flow test, non-swirl head type has the most good advantage for intake flow rate, and also the flow rate could be increased by using the SCV slightly. The effects of the type of engine head on intake air flow capability are dominant with respect to the existence of the SCV. We could measure the qualitative grade of swirl by capturing the scattering signal of microballoon from ICCD camera in the visualization diesel engine.

• 한국초등과학교육학회지:초등과학교육
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• 제36권1호
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• pp.73-84
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• 2017

Cultivating creativity is one of the goals in science education. Previous studies report that students use visualization while they solve the creative science problem and it looks helpful to make them think more. For this study three $6^{th}$ grade students were selected in the consideration of pre-test through the qualitative think-aloud method. The results show that even though students have many ideas in planning stage in problem solving, they appeared to visualize familiar and empirical ideas at first. So if teachers want to watch another creative ideas, they tended to give enough time to visualize many ideas. Students drew lines, circles, "X"marks to select or remove information during their problem solving works. They said these marks seem to be useful to understand question. However, removal marks sometimes turn out to block another chance to re-think. Also students did not have a chance to reflect what they did. It means that they lose the chance to do convergent thinking. The implications of this study include the importance of students' visualization works to facilitate their creative ideas and support their problem solving strategies. In this study, we discuss the meaningful messages for teachers who construct science classroom for creativity.

• 설비공학논문집
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• 제17권8호
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• pp.772-779
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• 2005

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.

• 조명전기설비학회논문지
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• 제24권8호
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• pp.84-93
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• 2010

이 논문은 이산신호가 연속적으로 입력될 때, 이산신호에서 고속으로 파라미터를 추정하고, 그 결과를 시각화하는 방법에 대해서 기술하고 있다. 이 논문은 이산푸리에변환에서 직접 파라미터를 추정하는 고속파라미터 추정 알고리즘을 적용하여 연속신호에서 파라미터를 추정하고, 추정한 중요 파라미터들을 효율적으로 시각화하는 방법에 대해서 기술하고 있다. 이 논문에서 제안한 연속신호에 대한 저주파 파라미터 추정방법을 3개의 모드를 가진 시험함수에 적용하여 제안한 알고리즘과 시각화의 효율성을 검증하였다.

• 한국자동차공학회논문집
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• 제16권6호
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• pp.19-25
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• 2008

Selective Catalytic Reduction is effective in the reduction of NOx emission. This research focused to evaluate the performance of a urea-SCR system and was conducted in two procedures. One is SCR reactor test using model gas in order to provide an optimal injection condition itself. In this step, some parametric study on emission temperature, space velocity, aspect ratio and the formation of urea spray were made by using flow visualization and Computation Fluid Dynamics techniques. The basic simulation results contributed in determining the layout for an actual engine test. The other is an engine performance and emission test. The urea injector was placed at the opposite direction of exhaust gases emitted into an exhaust duct and an optimal amount of a reducing agent is estimated accurately under different engine loads and speeds. Furthermore, the variation of NOx emission and applied amount of urea was investigated in terms of modes under the condition of with and without SCR, and other emissions such as PM, CO and NMHC were evaluated quantitatively as well. This research may provide fundamental data for the practical use of urea-SCR in future.