• 한국수학교육학회지시리즈A:수학교육
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• 제41권1호
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• pp.45-58
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• 2002

This study was conducted to investigate the gender-related effects of two instructional programs on spatial visualization skills of ninth grade students. Two instructional programs were developed for this study: a web-based virtual reality program and a paper-based program. 194 ninth graders from two middle schools in Seoul participated in this study. Six classes were divided into experimental groups and control groups. The Middle Grades Mathematics Projects (MGMP) Spatial Visualization Test was used to measure spatial visualization skills. The data analysis indicated that both the web-based and paper-based programs were effective to improve spatial visualization skills to treatment groups. Although boys'test mean scores were higher than girls' in the pretest, when deleting the effect of covariance of pretest, there were no statistical significance in the post-test. Girls in the treatment groups favored the paper-based spatial visualization program. These results imply that spatial training may benefit girls' performance more than that of boys and mode of instructional programs can create gender-related differences regarding spatial visualization skills.

• Journal of information and communication convergence engineering
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• 제21권1호
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• pp.54-61
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• 2023

The family tree is one of the key elements of humanities classics research and is very important for accurately understanding people or families. In this paper, we introduce a method for automatically generating a family tree using information on interpersonal relationships (IIPR) from the Korean Classics Database (KCDB) and visualize interpersonal searches within a family tree using data-driven document JavaScript (d3.js). To date, researchers of humanities classics have wasted considerable time manually drawing family trees to understand people's influence relationships. An automatic family tree builder analyzes a database that visually expresses the desired family tree. Because a family tree contains a large amount of data, we analyze the performance and bottlenecks according to the amount of data for visualization and propose an optimal way to construct a family tree. To this end, we create an n-ary tree with fake data, visualize it, and analyze its performance using simulation results.

• 대한전기학회논문지:시스템및제어부문D
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• 제53권5호
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• pp.368-373
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• 2004

Surface visualization can be useful, particularly for internet-based education and simulation system. Since the mesh data size directly affects the downloading and operational performance, the problem that should be solved for efficient surface visualization is to reduce the total number of polygons, constituting the surface geometry as much as Possible. In this paper, an efficient polygon reduction algorithm based on Stokes＇ theorem, and topology preservation to delete several adjacent vertices simultaneously for past polygon reduction is proposed. The algorithm is irrespective of the shape of polygon, and the number of the polygon. It can also reduce the number of polygons to the minimum number at one time. The performance and the usefulness for medical imaging application was demonstrated using synthesized geometrical objects including plane. cube. cylinder. and sphere. as well as a real human data.

• Journal of Information Technology Applications and Management
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• 제14권4호
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• pp.75-96
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• 2007

The effects of information quality and the importance of information have been reported in the Information Systems (IS) literature. However, little has been learned about the impact of information visualization types and contextual information on decision quality. Therefore, this study investigated the interaction effects of these variables on decision quality by conducting a laboratory experiment. Based on two types of information visualization and the availableness of contextual information, this study had a $2{\times}2$ factorial design. The dependent variables used to measure the outcomes of decision quality were decision accuracy and time. The results demonstrated that the effects of contextual information on decision quality were significant. In addition, there was a significant main effect of information visualization on decision accuracy. The findings suggest that decision makers can expect to improve their decision quality by enhancing information visualization types and contextual information. This research may extend a body of research examining the effects of factors that can be tied to human decision-making performance.

• 한국수소및신에너지학회논문집
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• 제19권3호
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• pp.182-188
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• 2008

In order to improve scavenging performance of free piston hydrogen fueled engine, this study estimate compatibility of uni-flow scavenging. The scavenging flow characteristics in the cylinder is investigated by flow visualization and PIV method. Consequently it has been found that the scavenging performance decreased with abnormal expansion of piston and delay of the exhaust valve opening timing. And the scavenging performance of exhaust valve located center in cylinder head is better than that of exhaust valve located side in cylinder head.

• 한국가시화정보학회지
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• 제10권3호
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• pp.37-41
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• 2012

Plate-fin heat exchanger is a kind of compact heat exchangers with a good performance in heat transfer. It is widely used in various engineering fields such as aerospace, chemical and biomedical industries. Quantitative and qualitative flow visualization study were performed using the water model of commercial plate-fin heat exchanger with header angles of $30^{\circ}$. The Reynolds number was 100. Conventional digital particle image velocimetry was used to measure the instantaneous velocity fields of the header region and the flow visualization using dye injection and hydrogen bubble method were applied to capture the qualitative flow characteristics. The results showed the existence of separation flow region at the junction area and the bottom wall of the exit region.

• 한국콘텐츠학회논문지
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• 제12권10호
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• pp.35-42
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• 2012

본 연구에서는 정보시각화의 미학적 작품이 공연 예술로 확장할 수 있는 가능성을 고찰한다. 정보 시각화는 정보의 시각적 전달이라는 기능적 충족 외에 몰입과 상호작용적 특성이 고려되는 관객과의 관계가 더욱 중요지고 있다. 이에 본 논문은 정보시각화의 정보 전달 과정이 하나의 공연으로 확장된다면 관객입장에서 감각적 센소리엄(Sensorium)을 증대 시킬 수 있는 요소를 고려할 필요가 있음을 주장하고자 한다. 이에 벤 루빈(Ben Rubin)과 마크 한센(Mark hansen)의 작품(2001)을 분석하여, 정보시각화 분야의 정보전달이라는 기능적 요소 외에 하이퍼매개(Hypermediacy)를 통한 관객과의 센소리엄을 증대 시키는요소를 고찰해 본다. 공연적 자아(the performing self), 공연적 인터페이스(the performing interface), 극적 패턴(the dramatic pattern)의 3가지 요소가 필요함을 제시하여 관객과의 센소리엄 관계를 탐구한다. 이 글을 통해 정보 시각화에 기반을 둔 미학적 작품들을 공연예술의 관점에서 확장하여 이해하고 해석하는데 기여하고자 한다.

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2009년도 춘계 종합학술대회 논문집
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• pp.185-190
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• 2009

최근 문화공연은 전통적인 공연예술의 틀을 벗어나 여러 장르를 도입하여 새로운 문화콘텐츠를 만들고 있으며, 특히 무대를 갖는 공연에는 영상예술과 첨단기술을 이용한 이색적인 공연이 나타나고 있다. 그 중에서도 무대 공연은 소리를 이용한 퍼포먼스가 행해지는 공연 같은 경우, 소리를 재해석하여 영상과 결합시킨 실험적인 공연이 나타나고 있다. 하지만 아직 대중 공연예술에서는 실시간 소리에 따라 영상을 시각화하는 과정이 자동화 되지 않고 있다. 이 경우 연주자와 관객이 즉흥적으로 내는 소리를 실시간으로 보여줄 수 없기 때문에 영상과 관객, 그리고 공연자의 상호교류가 이루어질 수 없다. 본 논문에서는 공연영상을 위한 실시간 사운드 시각화(Real-time sound visualization)를 실험함으로써 즉흥적인 공연 환경과 소통하는 영상 시각화를 제안한다. 영상 시각화는 공연예술에서 사용되는 악기 중 현악기를 중심으로 한다. 미디 환경을 기반으로 하는 맥스엠에스피/지터(MaxMSP/Jitter)를 이용하여 사운드 신호에 따른 영상 제어 시스템을 구축하고 코르그 나노 컨트롤(Korg Nano Kontrol) 기기를 활용하여 영상을 실험 및 제어한다. 이를 통해 공연 환경에 따라 미묘하게 달라지는 공연자의 감정과 박자감 그리고, 공연자의 행태에 따라 즉흥적으로 변화하는 실시간 인터랙티브 영상을 확인할 수 있다.

• International Journal of Contents
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• 제13권2호
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• pp.21-28
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• 2017

Abnormal data in the manufacturing process makes it difficult to find useful information that can be applied in data management for the manufacturing industry. It causes various problems in the daily process of production. An issue from the abnormal data can be handled by our method that uses big data and visualization. Visualization is a new technology that transforms data representation into a two-dimensional representation. Nowadays, many newly developed technologies provide data analysis, algorithm, optimization, and high efficiency, and they meet user requirements. We propose combined production of the data visualization approach that uses integrative visualization of sources of abnormal pattern analysis results. The perceived idea of the proposed approach can solve the problem as it also works for big data. It can also improve the performance and understanding by using visualization and solving issues that occur in the manufacturing process with a calendar heat map.

• 한국가시화정보학회지
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• 제22권2호
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• pp.20-26
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• 2024

Water management is crucial for the performance, durability, and stability of Polymer Electrolyte Membrane Fuel Cells (PEMFCs). Due to its importance, various methods for visualizing PEMFC's internal water distribution have been adapted to study and manage water within the cells. However, these methods often require large facilities, leading to high costs and significant barriers to entry. This study addresses these challenges by using a commercial Radiation (X-ray) Generator (RG) for internal water distribution visualization and comparing the results with synchrotron X-ray data from the Pohang Accelerator Laboratory (PAL) 9D beamline. Despite the lower resolution and potential beam distortion challenges, the RG shows promise for PEMFC water distribution visualization, suggesting the need for further research to refine water attenuation coefficients and build-up factors for improved measurement accuracy.