• 한국식품저장유통학회지
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• 제5권2호
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• pp.167-171
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• 1998

Bulkogi(roast beef) seasoning stored without cap at 5$^{\circ}C$ and 23$^{\circ}C$ and within capped boule at 5$^{\circ}C$, 23$^{\circ}C$, 38$^{\circ}C$, 48$^{\circ}C$ and heat cycling(38$^{\circ}C$-1 week and 5$^{\circ}C$-1 week) and investigated sensory quality, pH, VBN, amino-N, surface color, and viable cell counts during 6 month storage. Nonpackaged Bulkogi seasoning was deteriorated by molds after 2 weeks at 23$^{\circ}C$ but did not showed any significant quality changes at 5$^{\circ}C$ for 1 month. Sensory scores of packaged sample rapidly declined with the temperature increase but chemical criteria was not significantly changed depending on temperature and storage time. Correlations between sensory scores and chemical parameters was not found, but sensory scores on color was correlated with lightness(L. value) of surface color(r=0.899). Heat cycle storage resulted in similar changes in quality to 38$^{\circ}C$ storage. Ql0 values calculated by sensory evaluation results as a quality index was 6, and the shelf-life of packaged Bulkogi seasoning was predicted 88 months at 23$^{\circ}C$.

• 인간식물환경학회지
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• 제24권6호
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• pp.639-649
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• 2021

Background and objective: Various images from visual display terminals (VDTs) as well as living lighting are important parts of our daily life; thus, properly controlling the lighting environment - that is, illuminance, color temperature and good images from VDTs - can have a substantial effect on improving the mental health and work efficiency in everyday life. We examined electroencephalography (EEG) and heart rate variability (HRV) responses to various lighting conditions in 25 university students as they viewed images of a green landscape or traffic congestion. Methods: EEG was performed in darkness and when the room was illuminated with 10 different light-emitting diode (LED) color temperatures, while the EEG and HRV responses to green landscape or traffic congestion image stimuli were measured in darkness and during room illumination with three different LED color temperatures. Results: We found a significant difference between darkness and high LED illumination (400 lx) at 7 (CZ, F4, FZ, O1, O2, OZ, and T6) of 30 channels, while the alpha wave activity increased during darkness. In the second experiment, the green landscape image stimuli in the 30 lx-2600 K lighting condition elicited theta wave activity on the EEG, whereas the traffic congestion image stimuli under high LED illumination elicited high beta and gamma wave activities. Moreover, the subjects exhibited better stress coping ability and heart rate stability in response to green landscape image stimuli under illuminated conditions, according to their HRV. Conclusion: These results suggest that lower color temperatures and illumination levels alleviate tension, and that viewing green landscape image stimuli at low illumination, or in darkness, is effective for reducing stress. Conversely, high illumination levels and color temperatures are likely to increase tension and stress in response to traffic congestion image stimuli.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1993년도 Proceedings of International Conference for Agricultural Machinery and Process Engineering
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• pp.1354-1363
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• 1993

Optical methods were developed to examine their feasibility for quality evaluation of peanut with pod. Surface color and internal quality of peanut were measured without contact. The surface color of peanut was measured by light reflectance at a region of visible wavelengths. Its characteristic was high correlated with a visual grading of peanut. A trial machine for the color grading of peanut was developed using an optical sensor and it was considered to compare with the visual grading. The spectral reflectance at a region of near infrared wavelengths from 1,200 to 2,500nm was measured , and the chemical components of peanut were related to spectral reflectance at special wavelengths. The protein, fat and moisture contents of peanut were estimated by the near infrared methods. An infrared imaging method was developed to evaluate the internal quality of peanut with pod. As thermal characteristic of peanut with pod was deeply related to internal quality , the quality of peanut can be evaluated by temperature changes on the surface of peanut. Measurement of surface color, near infrared reflectance and thermal imaging were shown to be very effective in grading of peanut with pod.

• 한국전자통신학회논문지
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• 제10권6호
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• pp.757-762
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• 2015

본 논문은 색온도가 글씨 쓰기 과제 수행과 뇌파에 미치는 영향을 알아보고자 2013년 7월부터 9월까지 초등학생 아동 24명을 대상으로 실시하였다. 색온도의 고정과 유지를 위해 준비된 실험실에서 주황색등과 백색등에 따른 과제수행시간의 측정과 뇌파를 측정하여 분석하였다. 연구 결과 알파파, 베타파, 하이베타파의 출현이 백색등에서 높게 나타났으나 과제수행 시간은 주황색등에서 유의하게 빠른 수행을 보였다. 이는 기존의 낮은 색온도는 안정과 이완에 전형적인 색온도로 여겨졌으나 심인적인 요인과 과제의 특성과 종류에 따른 다양한 활용은 학습과 작업의 능률에 긍정적인 영향을 줄 수 있음을 제시했다.

• Journal of Applied Biological Chemistry
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• 제43권3호
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• pp.161-164
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• 2000

The effects of storage temperature and high relative humidity (RH) on the weight loss, color change, and microbial activity of a mushroom ('Sylvan' hybrid white) were investigated. The experiment was performed at three temperature (5, 10 and $15^{\circ}C$) and four different relative humidity levels (91, 94, 97 and 99%). The weight loss of the tested samples had a highly correlated linear relationship with storage time at each RH level during storage. Both the storage temperature and RH levels in the experiment had signigicant effects (p<0.05) on the weight-loss rate of the tested samples. The loss whiteness of mushrooms was not significantly affected (p>0.05) by RH ranges at the same temperature. No visible damage was caused by either bacteria or fungi in all samples during storage.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 제13회 신호처리 합동 학술대회 논문집
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• pp.705-708
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• 2000

일반적인 LCD의 색 재현 특성은 입력 디지털 값이 낮을수록 gray scale의 상관색온도가 상승하여 정확한 색 재현이 불가능하다. 본 논문에서는 LCD의 입력 디지털 값의 변화에 따른 특성을 조사하고, luminance, contrast 비 등의 특성에 열화없이 gray scale의 입력 잘 변화에 따른 상관색온도의 변화를 보정하기 위해서 입력 디지털 값을 조정하는 새로운 LUT를 제안하였다.

• Journal of the Optical Society of Korea
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• 제17권5호
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• pp.376-383
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• 2013

The design of the LEDs lighting in general household illumination was proposed and compared with the fluorescent lighting in this study. Using the LED as a light source would promote energy saving lighting for household illumination purposes. We used the LightTools and DIALux software to design and simulate different standards of illuminance, different correlated color temperatures and different color rendering indices for household environments. The power consumption and efficiency of traditional illuminated light sources and an LED light source with the same standard of illuminance for lighting the household environment were analyzed and compared with each other. Finally, our results show the advantages of using white-light LEDs for lighting and household illumination.

• 한국식품위생안전성학회지
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• 제1권2호
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• pp.157-162
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• 1986

공시균의 생육과 aflatoxin 생성에 미치는 temperature cycling의 영향을 조사하기 위해 temperature cycling($28^{\circ}C$에서 12시간, $7^{\circ}C$에서 12시간) aflatoxin 최대 생성 온도인 $28^{\circ}C$ 및 temperature cycling 할 때에 동일한 input를 가지는 $17.5^{\circ}C$의 세 가지 온도 시험구로 나누어 실험하였다. 그 결과 SLS 배지에서 temperature cycling을 행함으로써 $28^{\circ}C와\;17.5^{\circ}C$에서 일정하게 배양하는 것보다 공시균의 aflatoxin 생성이 증가하였다. 공시균의 aflatoxin 생합성은 색소 생성과는 밀접한 관계가 있는 반면 지질 생성과는 상반된 현상을 보였으며, 지방산 조성과는 뚜렷한 연관성을 보이지 않았다.

• 한국신뢰성학회지:신뢰성응용연구
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• 제12권3호
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• pp.177-186
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• 2012

This paper presents a comparison of the failure mechanism for high power converted white LEDs(3W) with the commercially available YAG:Ce and silicate phosphor. We carry out the normal aging life test for 10,000 hours, the high temperature aging test for 8,000 hours, the high temperature and humidity aging test for 8,000 hours and the current aging testing for 5,000 hours. The optical and electrical parameters of LEDs were monitored, such as lumen, correlated color temperature (CCT), chromaticity coordinates(x, y), thermal resistance, I -V curve and spectrum intensity. The stress induced a luminous flux decay on LED in all experiments and causes a failure. So we try to find out what's a main failure mechanism for a high power LED.

• 한국결정성장학회지
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• 제26권2호
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• pp.80-83
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• 2016

본 연구에서는 고출력 자동차 헤드램프용 LD 에 적용 가능한 garnet 구조의 YAG : Ce 형광체 세라믹 플레이트를 제작하고 광학 특성을 분석하였다. 액상법을 이용하여 단분산된 구형 나노 YAG : Ce 입자를 합성하고 이를 $Al_2O_3$와 혼합하여 형광체 세라믹 플레이트를 제작하였다. 형광체 세라믹 플레이트의 두께를 $75{\mu}m$, $100{\mu}m$로 조절하여 두께에 따른 광 변환 효율, 열 소광(Thermal quenching), 휘도 및 색온도의 광학 특성을 비교하였다. 실험 결과, 광 변환 효율의 감소 폭은 모두 25 % 감소하였고, 열 소광, 최대 광 변환 효율 값, 최대 휘도 값은 $100{\mu}m$ 일 때 더 높게 나타났다.