• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 B
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• pp.668-670
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• 1999

We have developed a automatic surface inspection system for cold Rolled strips in steel making process for several years. We have experienced the various kinds of surface inspection systems, including linear CCD camera type and the laser type inspection system which was installed in cold rolled strips production lines. But, we did not satisfied with these inspection systems owing to insufficient detection and classification rate, real time processing performance and limited line speed of real production lines. In order to increase detection and computing power, we have used the Dark Field illumination with Infra_Red LED, Bright Field illumination with Xenon Lamp, Parallel Computing Processor with Area typed CCD camera and full software based image processing technique for the ease up_grading and maintenance. In this paper, we introduced the automatic inspection system and real time image processing technique using the Object Detection, Defect Detection, Classification algorithms. As a result of experiment, under the situation of the high speed processed line(max 1000 meter per minute) defect detection is above 90% for all occurred defects in real line, defect name classification rate is about 80% for most frequently occurred 8 defect, and defect grade classification rate is 84% for name classified defect.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2004년도 추계학술대회 논문집 Vol.17
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• pp.112-115
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• 2004

Photovoltaic effects in $CuPc/C_{60}$ heterojunction structure have been studied depending on thickness of exciton blocking layer(BCP) and electrodes. Bare ITO and polymer coated electrode(PEDOT:PSS) were used as an anode, and Al, Ca/Al, Mg/Al, LiF/Al, and LiAl were used as a cathode. Photovoltaic parameters depending on BCP layer thickness from 0 to 60 nm and electrodes having different work function were measured using Keithley 236 source-measure unit and a 500W xenon lamp (ORIEL 66021). We have seen that the BCP layer thickness severely affects on the performance of photovoltaic cells.

• 대한기계학회논문집A
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• 제26권7호
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• pp.1416-1425
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• 2002

In this study, the effects of combined environmental factors on mechanical and thermal analysis properties of graphite/epoxy composites were evaluated by the use of an accelerated aging test. Environmental factors such as temperature, moisture. and ultraviolet were considered. A xenon-arc lamp was utilized for ultraviolet light. and exposure times of up to 3000 hours were applied. Several types of specimens - tensile. bending, and shear specimens those are transverse to the fiber direction, and bending specimens those are parallel to the tiber direction - were used to investigate the effects of environmental factors on mechanical properties of the composites. Also, glass transition temperature, storage shear modulus, loss shear modulus, and tan ${\delta}$ were measured as a function of exposure times through a dynamic mechanical analyzer. In addition. a suitable testing method for determining the effect of environmental factors on mechanical properties is suggested by comparing the results from using two different types of strain measuring sensors. Finally, composite surfaces exposed to environmental factors were examined using a scanning electron microscope.

• 한국철도학회논문집
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• 제8권2호
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• pp.188-194
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• 2005

Aging characteristics of glass fabric/phenolic composites for tilting train subjected to combined environmental aging factors were investigated. A 2.5KW accelerated aging tester with a xenon-arc lamp was used to provide environmental aging factors such as temperature, moisture, and ultraviolet. A series of aging tests were conducted up to 3000 hours and several types of specimens were prepared along the warp direction and the fill direction. Mechanical degradations for tensile, flexural, and shear properties were evaluated as a function of exposure times through a material testing system. Thermal analysis properties such as storage shear modulus, loss shear modulus, and tan 3 were measured through a dynamic mechanical analyzer. Finally exposed surfaces of the composites were examined using a scanning electron microscope. According to the experimental results, mechanical properties and thermal analysis properties of glass fabric/phenolic composites were found to be slightly degraded as a function of exposure times due to combined environmental effects.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2003년도 춘계학술대회 논문집 디스플레이 광소자분야
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• pp.123-126
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• 2003

Recently, there is a growing concern on the photovoltaic effects using organic materials. This is a phenomena which converts the solar energy into the electrical one. We have fabricated a device structure of $ITO/PEDOT:PSS/CuPc/C_{60}/BCP/AI$. The PEDOT:PSS layer is made by spin coating, and the other organic layers are made by thermal vapor deposition. By measuring the current-voltage characteristics with an illumination of light, we have obtained value of Voc=0.38V, Jsc=$0.5mA/cm^{2}$. And a fill factor and efficiency are about 0.314 and 0.083%, respectively. A 500W xenon lamp(ORIEL) is used for a light source, and the light intensity illuminated into the device was about 10mW.

• 한국조명전기설비학회지:조명전기설비
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• 제10권5호
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• pp.43-51
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• 1996

박물관에서 조명에 의한 전시물의 손상이 일어나는 것을 최소화하기 위해서 적절한 조명 기준이 요구된다. 이러한 조명 기준의 작성을 위한 기초 자료를 얻기 위하여, 방사에너지의 파장의 함수로 전시물의 변색을 측정할 수 있는 장치를 구성하였다. 크세논 램프를 광원으로 사용하고, 빛은 여러 가지 차광 필터를 통과하여 시료에 입사한다. 여러 차광 필터 밑의 시료의 색을 측정함으로써 특정 파장 범위의 방사 에너지에 의한 사료의 변색을 추정하였다. 측정 결과, 식물 염료들은 단시간에 심한 변색을 보였으나, 전래 종이는 상대적으로 거의 변색이 되지 않았다. 측정 결과를 이용하여 다른 광원에 의한 변색을 예측할 수 잇으며, 이는 조명 기준 작성의 근거가 된다.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2008년도 춘계학술대회논문집
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• pp.142-143
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• 2008

In the present work, high-speed video images of the ground take-off flight of a live butterfly were captured and their dynamic motions during the first full-stroke were analyzed. To capture the dynamic images of the take-off motion, the experimental setup consisted of a high-speed camera, a Xenon lamp as a light source and a transparent chamber of $15^W{\times}15^L{\times}17^H$ $cm^3$ in physical size. The ambient temperature and supplementary lighting devices were precisely controlled. The weight and wing span of the butterfly tested in this study was 104 mg and 63.14 mm, respectively. The ground take-off images were captured with 4000 fps with a spatial resolution of (1024${\times}$512) pixels. The period of the first full-stroke was 80.5ms and the flapping speed of downstroke was 2 times faster than that of upstroke. As a result, butterflies used the fling and near-clap motion to generate lifting force and an interesting take-off behavior of early pronation and downstroke was observed.

• 한국재료학회지
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• 제17권11호
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• pp.612-617
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• 2007

Both photoluminescence and thermal characteristics for $SrAl_2O_4:Eu^{+2},\;Dy^{+3}$ phosphors synthesized with various aluminum compounds (${\alpha}-Al_2O_3$, ${\gamma}-Al_2O_3$, amorphous-$Al_2O_3$ and $Al(OH)_3)$ were investigated in this study. The formation temperature of the host $SrAl_2O_4$ crystal is changed by these various aluminum compounds, as a result of the different thermal decomposition temperature of $SrCO_3$ phase. Among these compounds, the amorphous-$Al_2O_3$ phase shows the lowest formation temperature of the host $SrAl_2O_4$ crystal. The PL emission and excitation spectra of $SrAl_2O_4:Eu^{+2},\;Dy^{+3}$ phosphor are not affected by these aluminum compounds. After the removal of the Xenon lamp excitation (360 nm), however, the excellent longphosphorescent property of the phosphor is obtained by the amorphous-$Al_2O_3$ phase, although the decay time for all phosphors decrease exponentially.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2005년도 추계학술대회 논문집 Vol.18
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• pp.285-286
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• 2005

Organic photovoltaic properties were studied in ZnPc/$C_{60}$ heterojunction structure by varying the organic layer thicknesses and exiton blocking layer(EBL). Current density-voltage characteristics of organic photovoltaic cells were measured using Keithley 236 source-measure unit, a 500W xenon lamp (ORIEL 66021) for a light source and Agilent 4294A impedance analyzer in the range of 40 Hz $\sim$ 1 MHz. From the analyses of current-voltage characteristics such as short-circuit current density, open-circuit voltage and power conversion efficiency, optimum thickness of the organic layer were obtained and frequency response such as electrical conductance.

• 한국의류학회지
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• 제16권2호
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• pp.181-187
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• 1992

일반적으로 면섬유는 햇빛에 의해서 변색되거나 약해지며 또 그 외에도 여러가지 물리적, 화학적인 변화를 일으키게 된다. 구체적인 화학반응의 메카니즘은 사용되는 광선의 스펙트럼, 대기조건(실내인 경우는 실내 환경조건) , 산소의 유무 그리고 염료 등 첨가물의 종류와 같은 여러 요소에 의해 크게 영향을 받게 된다. 환경조건 중에서 산소의 존재는 매우 중요하지만 open system에서 산소의 농도가 일정하다고 가정할 때 면섬유가 접하고 있는 환경조건 중에서 온도와 습도는 photodegradation의 속도를 결정짓는 중요한 요인으로 작용하게 된다. 박물관,:기념관, 도서관 등의 소장품이 자연광선이나 인공조명으로부터 손상되는 것을 막기 위해서는 먼저 이들의 photodegradation 현상에 대한 연구를 필요로 한다. 본 연구에서는 면시칩포를 자연광선과 가장 흡사한 스펙트럼을 가진 xenon arc lamp를 사용한 내후도 시험기내에서 온도와 습도를 조절하여 이에 따른 반응속도의 차이를 인열강도의 감소와 중합도 저하로 측정하였다. 1차 반응식은 실험결과를 설명하는데 유용하였으며 온 · 습도의 증가는 반응속도를 증가시키는 것으로 나타나 기존의 상반된 연구결과의 차이를 입증하였다. 또 온도와 습도는 상호관련이 있는 것으로 나타났으며 고온인 경우습도의 영향을 더 크게 받는 것으로 분석되었다. 반응의 활성에너지는 $30\~75\%$ RH에서는 12 kcal/mole 정도이며 수분의 함량이 낮을수록 활성화에너지는 커지는 것으로 나타나 수분은 섬유소 분자구조내에서 가소제 (plasticizer)의 역할을 하는 것으로 판명되었다.