• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2013년도 추계학술대회 논문집
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• pp.519-524
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• 2013

The purpose of this study is that developing the index which evaluate sound quality of door latch and improving its sound quality through that results. For that, various operating sound of door latch was used for jury test. Loudness and sharpness related metrics are dominant in sound quality index we developed. This research investigate the main transfer path of its operating sound through sound field visualization and get conclusion that could reduce the impact sound of door latch. Therefore, we could verify sound quality improvement of modified product by using sound quality index.

• 비파괴검사학회지
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• 제30권3호
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• pp.257-260
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• 2010

Advancements in the imaging and computing technology have opened the path to digital holography for non-destructive investigations of technical samples, material property measurement, vibration analysis, flow visualization and stress analysis in aerospace industry which has widened the application of digital holography in the above fields. In this paper, we demonstrate the non-destructive investigation and micro-structure measurement application of digital holography to the small particles and a biological sample. This paper gives a brief description of the digital holograms recorded with this system and illustratively demonstrated.

• 정보처리학회논문지A
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• 제11A권4호
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• pp.277-284
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• 2004

본 논문은 사용자로 하여금 계층적 가시화 기법에 의한 표정들의 공간으로부터 일련의 표정을 선택하게 함으로써 3차원 아바타의 표정 제어기법을 기술한다. 본 시스템에서는 2,40P0여개의 표정 프레임을 이용하여 2차원 표정공간을 구성하였으며, 3차원 아바타의 표정 제어는 사용자가 표정공간을 항해하면서 수행한다. 그러나 표정의 수가 너무 많아 사용자가 항해를 하는데 어려움이 많기 때문에 계층적 가시화 기법이 필요하다. 표정공간을 계층적으로 분할하기 위해, 퍼지 클러스터링을 이용한다. 초기 단계에서는 2,400여개의 표정들을 이용하여 약 11개의 클러스터센터를 가지도록 클러스터링한다. 클러스터 센터들은 2차원 평면에 표시되며 후보 키 프레임으로 사용된다 사용자는 후보 키 프레임들 중에서 특정 키 프레임들을 선택하여 초기 항해경로를 생성한다. 사용자가 줌 인(이산적인 단계를 가지고 있음)을 하면 상세한 단계를 보기를 원한다는 의미이므로 줌 인된 단계에 적합한 표정 클러스터들을 생성한다. 단계가 증가될 때 마다 클러스터의 수를 두 배로 하고, 클러스터의 수만큼 표정들을 클러스터링한다. 사용자는 현재 단계에서 그전 단계의 항해경로를 따라 새로운 키 프레임(클러스터 센터)들을 선택하여 항해경로를 갱신한다. 줌 인을 최대로 한 마지막 단계에서 항해경로를 갱신하면 표정 제어 설정이 끝난다. 사용자는 언제든지 줌 아웃을 통해 그 전단계로 돌아가서 항해경로를 수정할 수 있다. 본 논문은 본 시스템이 어떤 효과가 있는지를 알기 위해 사용자들로 하여금 본 시스템을 사용하여 3차원 아바타의 표정 제어를 수행하게 하였으며, 그 결과를 평가한다.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2005년도 춘계학술대회
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• pp.326-329
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• 2005

Proton exchange membrane (PEM) should be sufficiently hydrated with proper water management to maintain a good ionic conductivity and performance of a PEM fuel cell. However. cathode flooding resulting from excess water can impede the transport of reactants and hence deteriorate the fuel cell performance. For the PEM fuel cell to be commercially viable as vehicle or portable applications, the flooding on the cathode side should be minimized during the fuel cell operation. In this study, visualization technique was applied to understand the cathode flooding phenomena on the cathode side of a PEM fuel cell. To this end. a transparent PEM unit fuel cell wi th an act ive area of $25cm^2$ was designed and manufactured to allow for the visualization of cathode channel with performance characteristics. Two-phase flow resulting from the electro-chemical reaction of fuel cell was investigated experimentally. The images photographed by CCD camera with cell operating temperatures $(30\~50^{\circ}C)$ were presented. Results indicated that the flooding on the cathode side first occurs near the exit of cathode channel. As the operating temperature of fuel cell increases. it was found that liquid water droplets tend to evaporate easily and it can have an influence on lowering the flooding level. It is expected that this study can effectively contribute to the detailed researches on modeling water transport of an operating PEM fuel cell including two-phase flow phenomena.

• Journal of Korean Neurosurgical Society
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• 제65권4호
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• pp.572-581
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• 2022

Objective : Compared to microscopes, exoscopes have advantages in field-depth, ergonomics, and educational value. Exoscopes are especially well-poised for adaptation into fluorescence-guided surgery (FGS) due to their excitation source, light path, and image processing capabilities. We evaluated the feasibility of near-infrared FGS using a 3-dimensional (3D), 4 K exoscope with near-infrared fluorescence imaging capability. We then compared it to the most sensitive, commercially-available near-infrared exoscope system (3D and 960 p). In-vitro and intraoperative comparisons were performed. Methods : Serial dilutions of indocyanine-green (1-2000 ㎍/mL) were imaged with the 3D, 4 K Olympus Orbeye (system 1) and the 3D, 960 p VisionSense Iridium (system 2). Near-infrared sensitivity was calculated using signal-to-background ratios (SBRs). In addition, three patients with brain tumors were administered indocyanine-green and imaged with system 1, with two also imaged with system 2 for comparison. Results : Systems 1 and 2 detected near-infrared fluorescence from indocyanine green concentrations of >250 ㎍/L and >31.3 ㎍/L, respectively. Intraoperatively, system 1 visualized strong near-infrared fluorescence from two, strongly gadolinium-enhancing meningiomas (SBR=2.4, 1.7). The high-resolution, bright images were sufficient for the surgeon to appreciate the underlying anatomy in the near-infrared mode. However, system 1 was not able to visualize fluorescence from a weakly-enhancing intraparenchymal metastasis. In contrast, system 2 successfully visualized both the meningioma and the metastasis but lacked high resolution stereopsis. Conclusion : Three-dimensional exoscope systems provide an alternative visualization platform for both standard microsurgery and near-infrared fluorescent guided surgery. However, when tumor fluorescence is weak (i.e., low fluorophore uptake, deep tumors), highly sensitive near-infrared visualization systems may be required.

• Safety and Health at Work
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• 제13권1호
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• pp.40-50
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• 2022

Background: Underground mines have several hazards that could lead to serious consequences if they come into effect. Acquiring, evaluating, and using the real-time data from the atmospheric monitoring system and miner's positional information is crucial in deciding the best course of action. Methods: A graphical user interface-based software is developed that uses an AutoCAD-based mine map, real-time atmospheric monitoring system, and miners' positional information to guide on the shortest route to mine exit and other locations within the mine, including the refuge chamber. Several algorithms are implemented to enhance the visualization of the program and guide the miners through the shortest routes. The information relayed by the sensors and communicated by other personnel are collected, evaluated, and used by the program in proposing the best course of action. Results: The program was evaluated using two case studies involving rescue relating to elevated carbon monoxide levels and increased temperature simulating fire scenarios. The program proposed the shortest path from the miner's current location to the exit of the mine, nearest refuge chamber, and the phone location. The real-time sensor information relayed by all the sensors was collected in a comma-separated value file. Conclusion: This program presents an important tool that aggregates information relayed by sensors to propose the best rescue strategy. The visualization capability of the program allows the operator to observe all the information on a screen and monitor the rescue in real time. This program permits the incorporation of additional sensors and algorithms to further customize the tool.

• 대한토목학회논문집
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• 제32권1A호
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• pp.31-37
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• 2012

콘크리트는 대표적인 다상 재료로서, 재료를 구성하는 각 성분의 공간적 분포는 콘크리트의 특성에 큰 영향을 미친다. 콘크리트에 존재하는 공극(void)은 콘크리트의 강도 및 투수성에 큰 영향을 주는 요인으로서, 콘크리트의 재료 물성의 파악을 위해 내부 공극의 분포를 파악하는 것은 매우 중요하다. 본 연구에서는 투수 콘크리트의 공극 분포 분석을 위해서 CT(computed tomography)로부터 얻은 단면 이미지를 중첩하여 3차원 콘크리트 디지털 시편을 생성, 공극 분포를 시각화(visualization)하였다. 공극 분포 상태를 확률적으로 묘사하기 위하여 확률 분포 함수들(two-point correlation function, lineal-path function과 two-point cluster function)을 사용하여 투수 콘크리트 디지털 시편의 공극 분포를 분석하였다. 그 결과, CT와 확률 분포 함수를 이용한 3차원 이미지 분석 방법을 통하여 투수 콘크리트 내부에 존재하는 공극의 공간적 분포에 대한 연속성, 투수성 및 이방성을 효과적으로 파악할 수 있음을 확인하였다.

• 한국멀티미디어학회논문지
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• 제23권9호
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• pp.1210-1218
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• 2020

This study selected brand logos of six South Korean and Chinese banks including KB, IBK, SH, ICBC, ABC, and SISB, conducted Eye Tracking experiment among 36 South Korean and Chinese university students(Nine male and female students, respectively), and analyzed the difference of visual attention of consumers on bank brand logo, symbol, Korean/Chinese character logo types as well as the difference of visual attention of these consumers on English logo types. Results were represented by using statistics and visualization including GAZEPLOT, HEATMAP, and visual expression. Results showed that most generally gazed logo types more often and longer than symbols when they watched bank brand logos. A slight difference was observed between both groups in terms of gazing English logo types. This study has a implication that it proposed the possibility of drawing quantitative and reliable outcomes by utilizing eye tracking device and approaching in an objective standpoint beyond a methodological aspect on bank brand logo primarily leaning over the analysis of case research or design development. Moreover, findings are expected to serve as basic data for proposing the direction of special bank brand logo design and marketing strategies.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 1999년도 Proceedings of International Symposium on Remote Sensing
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• pp.127-131
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• 1999

Typhoons were known by contributing to transporting plus heat or kinetic energy from equatorial region to midlatitude region. Due to the strong damage from typhoon, we acknowledged the theoretical study and the importance of accurate forecast about typhoon. In this study, typhoon forecasting system was developed to search the tracks of past typhoons or to display similar track of past typhoon in comparison with the path of current forecasting typhoon. It was programmed using Interactive Data Language(IDL), which was a complete computing environment for the interactive analysis and visualization of data. Typhoon forecasting system was also included satellite image and auxiliary chart. IR, Water Vapor, Visible satellite images helped users analyze an accurate forecast of typhoon. They were further refined the procedures for generating water vapor winds and gave an initial indication of their utility for numerical weather prediction(NWP), in particular for typhoon track forecasting where they could provide important information. They were also available for its utility in typhoon tracer or intensity.

• 한국소음진동공학회논문집
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• 제25권9호
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• pp.614-619
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• 2015

The purpose of this study is that developing the index which evaluate sound quality of door latch and improving its sound quality through that results. For that, various operating sound of door latch was used for jury test. Loudness and sharpness related metrics are dominant in sound quality index we developed. This research investigate the main transfer path of its operating sound through sound field visualization and get conclusion that could reduce the impact sound of door latch. Therefore, we could verify sound quality improvement of modified product by using sound quality index.