• 한국전산유체공학회지
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• 제16권1호
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• pp.30-35
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• 2011

In this paper, our effort to apply 3-D Virtual Reality system for stereoscopic visualization of mesh data on the web is briefly described. This study is an extension of our previous and on-going research efforts to develop an automatic grid generation program specialized for wing mesh, named as eGWing. The program is developed by using JAVA programming language, and it can be used either as an application program on a local computer or as an applet in the network environment. In this research advancing layer method(ALM) augmented by elliptic smoothing method is used for the structured grid generation. And to achieve a stereoscopic viewing capability, two graphic windows are used to render its own viewing image for the left and right eye respectively. These two windows are merged into one image using 3D monitor and the viewers can see the mesh data visualization results with stereoscopic depth effects by using polarizing glasses. In this paper three dimensional mesh 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 mesh data visualization system which can be shared by many users through the web.

• 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.

• 대한화장품학회지
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• 제43권1호
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• pp.79-86
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• 2017

본 연구는 두 개의 편광판 사이에서 홀로그램과 같은 독특한 외관을 갖는 라멜라 액정상 메이크업 클렌징 제형에 관한 것이다. 라멜라 액정상을 갖는 메이크업 클렌징 제형 연구는 오래전부터 많이 시도되어 왔지만, 탁도 증가 및 점도 상승 등의 문제로 실제 상용화에는 한계가 있었다. 본 연구에서는 이러한 문제를 해결하기 위해 계면활성제의 알킬 체인에 의한 액정상의 유동성 증가와 음이온 계면활성제 도입에 따른 정전기적 반발력 증가를 이용하였다. 이를 통해 액정상의 결정화를 억제하여 안정한 액정상 제형을 확보할 수 있었다. 또한, 본 연구에서는 객관적이고 정량적인 클렌징력 평가를 위해 형광물질과 in vivo imaging system (IVIS) 장비를 이용하여 in vitro 클렌징력 평가법을 새롭게 도입하였다. 이렇게 개발된 클렌징력 평가법을 이용하여 라멜라 액정상 메이크업 클렌징 제형의 우수한 메이크업 클렌징력을 확인할 수 있었다. 한편, 본 연구에서 개발된 라멜라 액정상 메이크업 클렌징 제형을 직교 배열된 두 편광판 사이에 두면 홀로그램과 유사한 특이적인 무늬를 관측할 수 있다. 이러한 현상은 액정상 제형을 통과하는 가시광선과 라멜라 구조 사이의 간섭현상에 의한 것으로 추정된다. 클렌징 제형에서의 라멜라 구조는 소각 X선 산란분석(SAXS)을 이용하여 Bragg spacing ratio가 1 : 2의 정수비로 관찰되는 것을 통해 확인하였다. 본 연구를 통해 개발된 라멜라 액정상 메이크업 클렌징 제형은 우수한 경시 안정성과 클렌징력, 그리고 편광판 사이에서 관찰되는 홀로그램과 유사한 독특한 외관으로 인해 향후 새로운 메이크업 클렌징 제품 개발에 도움이 될 것으로 기대된다.

• 대한소아치과학회지
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• 제30권2호
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• pp.189-195
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• 2003

본 연구의 목적은 레이저 형광법을 이용해 초기 치아우식증을 광학적으로 진단하기 위해 진단감도를 높이는 것이다. 소의 치아를 STPP 인공우식병소 유발용액에 침잠시키고 다양한 깊이의 병소를 유발한 후 표면에 아르곤 레이저를 이용해 형광현상을 유도하고 여러 가지 필터를 부착한 CCD 카메라로 이와 같은 형광현상을 촬영하여 컴퓨터로 전송하였다. 컴퓨터 영상분석 프로그램을 이용하여 병소 표면에서의 광밀도를 측정하였다. 이 실험에서 사용한 필터는 노랑색, 호박색, 오렌지색, 그리고 빨강색이였으며 광밀도를 측정한 후에는 치아 시편을 절단하여 편광현미경으로 실제 조직학적 병소의 깊이를 측정하고 병소의 깊이와 여러 가지 필터를 사용하여 측정한 병소 표면에서의 광밀도간의 상관관계를 분석하여 다음과 같은 결과를 얻었다. 1. 조직학적 병소의 깊이가 증가될수록 호박색과 오렌지색 필터를 사용하여 측정한 병소 표면에서의 광밀도는 증가되었다. 2. 병소 표면에서의 광밀도와 조직학적 병소의 깊이 사이의 상관계수는 오렌지색 필터가 가장 컸으며(r=0.49), 다음 호박색(r=0.32) 노랑색(r=0.13), 빨강색(r=0.01) 순 이였다. 3. 회귀분석결과 오렌지색 필터를 사용한 경우 병소표면에서의 광밀도와 조직학적 깊이 사이에 가장 직선에 가까운 회귀방정식을 나타내었다. 이상의 결과를 종합해 볼 때 오렌지색 필터가 건전치질과 우식치질 사이의 색조대비를 잘 표현하여 진단감도를 높일 수 있는 방법으로 생각되며 이와 같은 레이저 형광법으로 치아우식증의 조기탐지는 물론 비침습적 방법으로 치아우식증의 진행정도를 평가할 수 있을 것으로 사료된다.

• 전자공학회논문지A
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• 제29A권11호
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• pp.106-112
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• 1992

In this paper, we analyze the structure characteristics of $As_{40}Se_{50-x}S_{x}Ge_{10}$ system bulk and thin films. As the results of XRD patterns, it identified amorphous state. In order to find the glass transition temperature($T_g$), crystallization($T_c$) and melting point ($T_m$)of bulk sample, it ascertained that TS1gT is 238$^{\circ}C$ in $As_{40}Se_{15}S_{35}Ge_{10}$, and 231$^{\circ}C$ in $As_{40}Se_{25}S_{25}Ge_{10}$ & $As_{40}Se_{50}Ge_{10}$ following the thernal analysis by DSC, DTA, & TGA method. Also it was confirmed the phase seperation of continuous phase and dispertion phase by the optical texture of polarizing microscope and $T_g$ near 20$0^{\circ}C$ in thin film. Therefore, it was found that it occurs the phase seperation of Ge-rich dontinuous phase and Se-rich dispersion phase following the EDS analysis of thin film and the surface SEM photograph.

• 한국결정성장학회지
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• 제8권4호
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• pp.544-549
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• 1998

$KMgCl_3$ 단결정을 Ar 분위기에서 최초로 Czochralski 방법을 사용하여 육성하였다. 원료시약 KCl과 $KMgCl_2$를 화학량론적인 혼합으로는 KMgCl3를 육성할 수 없었고 비화학량론적인 방법을 사용하여 $KMgCl_3$를 육성할 수 있었다. KCl과 MgCl2를 1:1의 비율로 혼합하여 결정을 육성하였을 때에는 $K_2MgCl_4$단결정이 육성되었다. 육성되어진 $KMgCl_3$ 단결정의 연속적 상전이점들을 확인하기 위하여 DTA, DSC 등이 열적 실험을 수행하였다. 그리고 $KMgCl_3$ 단결정이 강탄성적 성질을 가짐을 확인하였으며 고온 편광현미경을 사용하여 온도에 따른 강탄성 domain의 변화를 조사하였다. 또한 stress-strain 이력곡선의 조사를 통하여 결정내 spontaneous strain의 온도에 따른 변화를 조사하였다.

• Journal of the Optical Society of Korea
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• 제13권2호
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• pp.245-250
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• 2009

We propose a digital holographic interference analysis method based on a 2-frame phase-shifting technique for measuring an optical mirror surface. The technique using 2-frame phase-shifting digital interferometry is more efficient than multi-frame phase-shifting techniques because the 2-frame method has the advantage of a reduced number of interferograms, and then takes less time to acquire the wanted topography information from interferograms. In this measurement system, 2-frame phase-shifting digital interferograms are acquired by moving the reference flat mirror surface, which is attached to a piezoelectric transducer, with phase step of 0 or $\pi$/2 in the reference beam path. The measurements are recorded on a CCD detector. The optical interferometry is designed on the basis of polarization characteristics of a polarizing beam splitter. Therefore the noise from outside turbulence can be decreased. The proposed 2-frame algorithm uses the relative phase difference of the neighbor pixels. The experiment has been carried out on an optical mirror which flatness is less than $\lambda$/4. The measurement of the optical mirror surface topography using 2-frame phase-shifting interferometry shows that the peak-to-peak value is calculated to be about $0.1779{\mu}m$, the root-mean-square value is about $0.034{\mu}m$. Thus, the proposed method is expected to be used in nondestructive testing of optical components.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1992년도 추계학술대회 논문집
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• pp.73-76
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• 1992

The amorphous phase of bulk and thin film in the As-Se-S-Ge system was observed by X-ray diffraction. Thermal analysis using DSC, DTA and TGA method has been used for the determination of the glass transition temperature, Tg. The glass transition temperature, Tg for the composition were $238^{\circ}C$ in $As_{40}Se_{15}S_{35}Ge_{10}$ and $231^{\circ}C$ in $AS_{40}Se_{25}S_{25}Ge_{10}$ and $As_{40}Se_{50}Ge_{10}$. The phase seperation of continuous phase and dispersive phase was observed by the optical texture of the polarizing microscope. Also, the glass transition temperature of the thin film was near $200^{\circ}C$. As the results of SEM-EDS analysis, the phase transition of the films by thermal treatment and light illumination was the amorphous to amorphous.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2010년도 제39회 하계학술대회 초록집
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• pp.195-195
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• 2010

In recent years, Anodic aluminum oxide(AAO) has become popular and attractive materials. It can be easily fabricated and self-organized pore structures. It has been widely used as a biosensor membrane, photonic crystal for optical circuit and template for nanotube growth etc. In previous papers, the theory was developed that AAO shows anisotropic optical properties, since it has anisotropic structure with numerous cylindrical pores. It gives rise to the anisotropy of the refractive index called as birefringence. It can be used as conventional polarizing elements with high efficiency and low cost. Therefore, we would like to compare the theory and experimental results in this study. One method which can measure effective refractive index of thin film is the prism coupling technique. It can give accurate results fast and simply. Furthermore, we can also measure separately the refractive index with different polarization using polarization of the laser (TE mode and TM mode). We calculated the effective refractive index with effective medium approximations (EMAs) by pore size in the SEM image. EMAs are physical models that describe the macroscopic system as the homogeneous and typical method of all mean field theories.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 C
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• pp.1668-1670
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• 2002

Since more than two decades, the conventional PD detecting systems have been employed in order to detect the partial discharges occurring inside the HV power apparatus for their diagnosis by use of different type of detection such as acoustic and UHF detection method. Regardless of their wide on-site application, a certain number of technical inconveniences have been disclosed as follows : multistage amplification. large volume, susceptible to external noise and high price. In this respect, the optical measurement techniques are widely proposed in these days in this concerned field ascribed to the following advantages : immune to external EMI noise and broad band response of the Pockels cell covering from DC to GHz. However, the reliability of several proposed techniques enabling to measure the electric field inside the large high power apparatus has not yet been well approved In this work, an optical measuring system, based on the Pockels effect, has been developed for measuring the field variation due to the corona discharges occurring in air and in oil. This system consists of He-Ne laser, single mode optical fiber, multi mode optical fiber, polarizing film, Y-cut LiNbO3 cell, photo detector, digital oscilloscope and personal computer with GPIB. For this purpose, optical probe has been specially designed and realized and put into the needle-plane electrode. Afterward, same measurement is carried out in oil. We demonstrate the characteristic of the optical measuring system and the measurement results.