• Restorative Dentistry and Endodontics
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• 제12권1호
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• pp.131-147
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• 1986

The purpose of this study was to observe the color matching of lining or filling materials according to the remaining tooth material. Twenty-seven freshly extracted human central incisors were used in this experiments. The teeth were stored in saline solution at room temperature after extraction. All teeth were cut parallel to the tangent to height of contour on labial surface from the lingual surface until the pulp were completely removed. Then 27 teeth were devided into 0.5mm, 1.0mm and 1.5mm reduction groups according to the thickness of cutting the lingual surfaces of teeth. The specimens of control group were three teeth of 27 teeth with cutting the lingual surface same mode as above described. In the specimens of experimental groups, 8 kinds of lining and filling materials; FUJI IONOMER TYPE II (G-C Co. Japan), LINING CEMENT (G-C Co. Japan), Dycal (Caulk, U.S.A.), CLEARFIL F II (Kuraray Co. Japan), Crown Bridge & Inlay Cement (G-C Co. Japan), Copalite (Harry J. Bosworth Co. U.S.A.), HY-BOND (G-C Co. Japan) and LIV-CENERA (G-C Co. Japan); applied on the back of 24 teeth with 0.5mm, 1.0mm and 1.5mm cut thickness of lingual surfaces. Three teeth of control group did not applied linging or filling materials on the back of 3 kinds of different thickness of cutting the lingual surfaces. The absorbances of total 27 specimens were obtained by reflection spectrophotometer. (Cary 17 D, Varian Co, U.S.A.) The following conclusions were drawn from above the results; 1. The absorbance patterns in both experiment and control groups were gradually decreased with increasing wavelength of spectra. 2. The absorbance patterns were not decreased in relation to the kinds of lining or filling materials, but the amount of the remaining tooth materials. 3. In 0.5mm reduction group, FUJI IONOMER TYPE II, LINING CEMENT, LIV-CENERA and Copalite applied on the back of cut lingual surface showed similar absorbance patterns as control group. 4. The specimens which were reduced up to 1.0mm thickness and lined with FUJI IONOMER TYPE II and LINING CEMENT showed the comparable absorbance patterns to the control group. 5. In case of HY-BOND application after 1.5mm reduction were observed the similar absorbance pattern as compared with control group. 6. When Dycal, CLEARFIL and Crown Bridge & Inlay Cement were applied to cut teeth surfaces, there were much differences of absorbance between control groups and experimental groups.

• 한국축산시설환경학회지
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• 제15권2호
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• pp.131-138
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• 2009

본 연구는 돼지의 체온 발산에 따른 행동에 근거하여 환경을 제어할 때 몸체에서 발산되는 체열과 환경의 온도차이를 이용하여 환경을 제어할 수 있는 방법을 모색하고자 하였으며, 열환경에서 얻어진 자료를 바탕으로 축사의 환경제어 시스템에 접목하고자 실시하였다. 연구의 결과를 요약하면 다음과 같다. 1. 환경온도에 따른 돼지의 행동을 칼라영상을 통하여 획득한 후 가시화 시스템 (열화상 프로그램)을 통한 행동상태를 고온, 적온, 저온기로 분류하였다. 2. 영상처리 시스템의 하드웨어를 적외선 CCD 카메라, 영상처리 보드DIF(TH3100) 모델과 컴퓨터는 400Hz, 128M, 586 Pentium로 구성되었으며, 프로그램은 C++ 언어로 작성되었다. 3. 영상처리시스템을 온도에 따라 분류했던 결과 저온, 적온, 고온으로 분류되어 돈사내 환경제어 시스템에 응용이 가능할 것으로 판단되었다. 4. 사료섭취량은 저온구가 다른 환경온도에 비하여 사료를 많이 섭취하였던 반면에 종료체중과 일당증체량에서는 낮게 나타났다 (p<0.05).

• 한국연초학회지
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• 제18권1호
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• pp.66-75
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• 1996

This study was carried out to investigate the effects of high temperature and humidity on the ageing of processed leaf tobacco. Four(1993) or six(1994) grades (Both flued-cured and burley) of processed leaf packed in carton box were stored under the natural and artificial conditions. When the Processed leaf was stored in the controlled mom at 40℃ with 75% R.H.(1993) for 40 days, the leaf pH was decreased. The decreasing rate of leaf pH was similar to that of leaf stored under the natural warehouse condition for 15 months. The degree of lightness and yellowness of leaf also decreased, while the decaying or darkening of the leaf was observed. When the processed leaf was stored in the controlled room at 35℃ with 65% R.H.(1994) for 90 days, the pH of flue-cured was decreased 0.22, which was similar to that of the leaf stored under the natural warehouse condition for 15 months, and the lightness, and redness of the leaf were higher than those of the control. As compared with the leaf stored under the natural condition for 2 years, the smoking quality of leaf stored under this condition was similar or somewhat better. The pH of burley tobacco changed little compared to that of flue-cured during storage in this study.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume I
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• pp.475-478
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• 2006

Total primary production resulting from the photosynthetic process can be defined as the amount of organic matter produced in a given period of time. It is proportional to the chlorophyll-a (chl-a) values in the surface layer of the ocean. The MODIS board on Aqua satellite measures visible and infrared radiation in 36 wavebands, providing simultaneous images of chl-a concentration and sea surface temperature (SST) in the upper layer of the sea. The seasonal distribution of chl-a concentration during one year from April 2005 to March 2006 was examined. Light has a role of starting the seasonal cycle. The Kuroshio Current in this area induces many oceanographical features affecting to the change of seasonal control. The chl-a concentration is also seasonal, which is low in summer and high in winter. In summer, the meandering of Kuroshio Current induces strong eddies and increases the chl-a concentration. In autumn, the delayed small autumn bloom occurred until last December due to the Kuroshio Current. When the Kuroshio axis moves far from the coast, the coastal water dominates and increases the concentration even in the winter. The spring bloom starts early at the beginning of March and decreases during the spring.

• 아시안잔디학회지
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• 제22권2호
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• pp.133-140
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• 2008

한지형 잔디는 하절기 온도가 $30^{\circ}C$ 이상까지 올라가는 우리나라에서 뿌리와 줄기의 성장이 급격히 저하되고 심하면 고사하게 된다. 기온의 상승으로 인한 지온 상승은 잔디뿌리에 스트레스가 되며 그 스트레스는 호르몬의 불균형적인 형성으로 지상부 생장 및 광합성, 증산작용 등의 여러 매카니즘에 많은 영향을 미치게 된다. 이러한 문제를 해결하기 위해 토양내 수분함량을 조절하기도 하고 유기물 함량을 조절하여 지온의 상승을 제한함으로서 잔디의 생육부진을 해소하는 연구도 수행되었다. 본 실험은 토양 수분의 변화에 따른 토양 온도의 변화 양상을 분석하고, 잔디 재배지에서의 토양 깊이와 수분 함량에 따른 열 전도 기작과 열 환경 변화에 따른 직접적인 잔디 생육(생산량, 녹도, 건조피해, 고온피해 등)에 미치는 영향을 연구하였다. 공시 초종으로 Kentucky bluegrass(Poa pratensis L.)를 선정하였고 각각의 실험구는 수분함량에 따라 25%, 33%, 40%의 3가지로 구분하여 처리하였다. 토양온도측정 센서를 각 실험구에 깊이 12cm 지점과 2cm 지점에 각각 2개씩 즉, 한 실험구당 4개의 토양온도측정 센서를 설치하여 매 5분마다 온도변화를 측정하였다. 수분함량에 따른 온도변화는 수분함량이 33% 일 때 가장 낮게 측정되었다. 잔디의 생육상태를 비교하여 볼 때 수분 함량이 33% 일 때 생육이 가장 양호하였으며 40% 일 때 가장 생육이 불량하였다. 하절기 고온 환경에서 한지형 잔디인 Kentucky bluegrass의 생육은 토양 수분함량에 따라 큰 영향을 받지만, 장마기에 잔디가 침수된 환경에서 토양 수분 함량을 최소한 33%까지 감소시켰을 경우에는 잔디 생육에 큰 영향을 받지 않을 것으로 사료된다.

• International Journal of Internet, Broadcasting and Communication
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• 제12권3호
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• pp.116-124
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• 2020

The advantage of the distance learning universities based on the 4th Industrial Revolution is that anyone can conveniently take lectures anytime, anywhere on the web. In addition, research has been actively conducted on the effect of light color and temperature control upon student performance during online classes. However, research on how the conditions of subjects, lighting colors, and music selection improve the degree of a student's concentration during online lectures has not been completed. To solve these problems in this paper, we have developed automatic analysis system SW for the weak subjects of learners by applying intelligent analysis algorithm, have proposed and simulated music therapy and art therapy. Moreover, It proposed in this paper an algorithm for an automatic analysis system, which shows the weak subjects of learners by adopting intelligence analysis algorithms. We also have presented and simulated a music therapy and art therapy algorithms, based on the blended learning, in order to increase students concentration during lecture.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2007년도 추계학술대회 논문집
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• pp.71-76
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• 2007

본 논문에서는 고 연색성의 실시간으로 색온도 제어 가능한 승강기용 조명제품 개발을 위하여 제품에 사용될 LED Package를 제작하고 고연색성 실현을 위한 색온도 제어 기초실험을 행하였다. 그리고 20W 급의 LED 광원모듈 구동회로와 색온도 제어를 위한 제어회로를 설계하였다. 또한 음영 제거 및 글레어 차단, 효과적인 광색혼합을 위하여 확산배광을 달성하기 위한 R, G, B, A, W LED의 최적 배치 및 렌즈의 광학설계를 수행하였고 LED에서 발생하는 열을 효과적으로 발산하여 LED 조명모듈의 온도를 낮추기 위한 방열설계를 실시하였다.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2007년도 추계학술대회 논문집
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• pp.65-70
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• 2007

고연색성의 실시간으로 색온도 제어 가능한 승강기용 조명 제품 개발을 위하여 4계절 별 일 중 주광의 색온도 변화를 계산하였다. 4계절 별 일 중의 색온도 변화는 대한민국 서울의 위치를 기준으로 태양광 직사조도, 청공광조도 등을 계산하고 지면조도와 색온도의 관계로부터 춘분, 하지, 추분, 동지의 일 중 색온도 변화를 계산하였다. 이 값들을 색온도 제어회로의 Microprocessor에 이식함으로 4계절 별로 실시간으로 색온도가 변화하는 승강기용 조명기구를 개발하였다. 또한 개발 시제품의 전기적, 광학적 성능 측정 결과 각각의 개발 목표 항목을 만족시켰다.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2004년도 Asia Display / IMID 04
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• pp.939-942
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• 2004

In this study, we report simulation results of single-panel LCOS (liquid crystal on silicon). Reflective LCOS microdisplays are widely used in various projection and near-eye application. For one panel system, liquid crystal response time is an important variable. The panel must switch fast enough to support the display of Field color sequential with high field rates. In order to have fast response and good contrast, a vertical alignment (VA) cell was used in this study. With suitable selection on LC parameters like temperature, viscosity, elastic constant and birefringence, it is possible to get response time of around 2ms from a 2.0 um-thick vertical alignment cell. This result also indicates an ease of production control on 2.0 um cells than 1.0 um cells.

• 한국식품저장유통학회지
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• 제8권2호
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• pp.181-186
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• 2001

The objective of this study is to determine the effect of soy protein isolate (SPI) film coating on the color, firmness, viscosity and weight loss of Rice Cake stored at 15, 20 and $25^{\circ}C$ (RH 50%) for 30 days. Raw materials mixed with SPI and cocoa powder (10:0, 7:3, 5:5, 3:7, w/w) were prepared. After adding sugar and shortening to raw materials, the mixture were refined to 25 micron of particle size. Coating of Rice Cake were carried out at $65^{\circ}C$. SPI coated Rice Cake had higher internal and external firmness comparing to the control at $25^{\circ}C$. SPI coated Rice Cake showed smooth surface morphology and had 0.71-1.01 mm of thickness. SPI coated Rice Cake showed less weight loss for 30 days compared to controls. SPI coating solution was successfully coated on Rice Cake and extended shelf-life over 15 days at room temperature.