• 한국작물학회지
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• 제31권3호
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• pp.293-298
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• 1986

담배종자의 발아생리를 깊게 이해하여 건묘육성의 기초자료를 얻고자 종자를 파종하여 발아될 때까지 종자체내에서 일어나는 생리적 변화를 명암조건 및 온도별로 조사하여 다음과 같은 결과를 얻었다. 1. 발아과정중 수분흡수는 치상후 3∼6시간까지 물리적인 수분흡수단계, 다음 6시간부터 24시간까지 보합세유지 세째단계로 48시간∼168시간까지 급격한 수분흡수 증가를 보이는 단계로 나눌 수 있었다. 그러나 암조건 및 저온에서는 세째단계의 급격할 수분흡수 양상을 볼 수 없었다. 2. 발아과정중 호흡의 변화도 수분흡수와 비슷하여 처음 48시간까지 호흡의 증가가 없었으나 48시간 이조 발아시작과 함께 급격허 상승하여 120시간을 전후하여 최고에 달하였다가 점차 떨어졌다. 반면, 암조건에서는 호흡이 매우 낮고 변화가 없었다. 3. 발아신 호흡의 증가와 더불어 지방산의 감소가 상응하게 일어났으며 당 및 지방산의 변화가 광조건에서는 많이 변화하였으나 암조건에서는 변화가 없었다.

• 한국생산제조학회지
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• 제19권2호
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• pp.235-240
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• 2010

The recent trend of vehicle design aims at crash safety and environmentally-friendly aspect. For the crash safety aspect, energy absorbing members should be absorbed with collision energy sufficiently. But vehicle structure must be light weight for the environmentally-friendly aspect, in order to improve fuel efficiency and to reduce tail gas emission. Therefore, the light weight of vehicle must be achieved in a status of securing safety of crash. An aluminum or CFRP (Carbon Fiber Reinforced Plastics) is representative one among the light-weight materials. In this study, impact collapse behavior of circular hybrid thin-walled member is evaluated. The hybrid members are manufactured by wrapping CFRP prepreg sheets outside the aluminum circular members in the autoclave. Because the CFRP is an anisotropic material whose mechanical properties change with its stacking condition, special attention is given to the effects of the stacking condition on the collapse behavior evaluation of the hybrid thin-walled member. Collapse mode and energy absorption capability of the hybrid thin-walled member are analyzed with change of the fiber orientation angle and interface number.

• 한국식생활문화학회지
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• 제29권6호
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• pp.599-604
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• 2014

This research was conducted to investigate changes in isoflavone contents and sprouting characteristics of germinated soybeans [Glycine max.] under light condition. The relative wet weight of soybeans increased as germination progressed, and it reached $291.1{\pm}14.3%$ at 60 h after beginning of sprouting. On the other hand, relative dry weight slowly decreased as germination progressed. The length of sprouting rapidly increased as germination progressed. The sprouting rate sharply increased from 12 h to 48 h and reached $96.4{\pm}2.5%$ at 60 h after sprouting. In terms of color, L value did not change until 24 h after the beginning of germination, but it rapidly increased from 24 h to 36 h and did not change thereafter. The a value rapidly increased at 24 h after the beginning of germination and decreased thereafter. The b value rapidly increased at early and last stages and reached $9.0{\pm}0.7$ at 60 h after the beginning of sprouting. Total isoflavone reached a maximum level at 12 h after the beginning of germination and consistently decreased thereafter. Among isoflavone compounds, m-genistin had the highest content followed by daidzin and m-daidzin.

• 한국소음진동공학회논문집
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• 제25권8호
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• pp.568-574
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• 2015

The present study was conducted by using stereo pattern recognition method(SPR method) to measure the displacement and vibration of an airplane wing in flight condition. A SPR based measurement system was developed using two visible light stereo cameras. The visible light stereo images were processed to obtain marker points by adaptive threshold method and marker filtering technique. The marker points were used to reconstruct 3D point, displacement, and vibration data. The SPR system was installed on F-16 fighter. The wing displacement and vibration were measured in flight condition. Therefore, this paper presents a possibility that SPR based measurement system using visible light stereo camera can be very useful for measuring displacement and vibration of an airplane in flight condition.

• Plant Resources
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• 제7권1호
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• pp.7-14
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• 2004

Allium wakegi was cultured shoot tip in the condition of light culture. The Allium wakegi added plant growth regulator was observed of plant regeneration and bulblet formation. Callus Induction and growing rate was the best of 78％ when added alone 2,4-D 0.5mg/L. In the formation of shoot, its regeneration rate was 96％ when added BA 0.5mg/L in the light culture condition. When BA 0.5mg/L and NAA 0.5mg/L mixed and BA 0.5 mg/L and NAA 1.0mg/L mixed, the rates were 99％ and 97％ respectively, and these conditions were suitable for forming shoot. In the formation of roots, when added NAA 2.0mg/L in the light culture condition, the regeneration rate was 90.6 ％ and the roots were abnormal. When added NAA 1.0mg/L, the rate was 82 ％ and the highest. In the formation of bulbs, when BA 05mg/L and NAA 1.0mg/L mixed, the root generantion and its size in the bulbs was the best compare to other treatment experiments.

• Journal of Photoscience
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• 제9권2호
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• pp.427-429
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• 2002

We studied iron release from ferritin by irradiating the visible light, and then followed ferritin-mediated lipid peroxidation in the rod outer segment (ROS) fraction of the porcine retina. In the presence of several phosphorus compounds such as ADP and ATP, iron release from ferritin at pH 7.0 could be induced by irradiation of the visible light to the reaction mixtures. Furthermore, iron release from ferritin in the presence of ADP depended on the incubation time and the visible light irradiation. Moreover, we investigated lipid peroxidation level in the ROS fraction by two independent assay systems including the thiobarbituric acid (TBA) and ferrous oxidation/xylenol orange (FOX) methods. The visible light induced ferritin-mediated lipid peroxidation in the ROS fraction in time- and irradiance-dependent manners. In the dark condition, iron release and lipid peroxidation were not observed. Iron release from ferritin by irradiating the visible light may play an important role in the etiology of phototoxic injuries in vivo.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2004년도 추계학술대회 논문집
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• pp.1057-1060
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• 2004

In this study, the wear characteristics of five different dental composite resins cured by conventional halogen light and LED light sources were investigated. Five different dental composite resins of Surefil, Z100, Dyract AP, Fuji II LC and Compoglass were worn against a zirconia ceramic ball using a pin-on-disk type wear tester with 15 N contact force in a reciprocal sliding motion with sliding distance of 10 mm/cycle at 1Hz under the room temperature dry condition. The wear variations of dental composite resins were linearly increased as the number of cycles increased. It was observed that the wear resistances of these specimens were in the order of Dyract AP ＆gt; Surefil ＆gt; Compoglass ＆gt; Z100 ＆gt; Fuji II LC. On the morphological observations by SEM, the large crack formation on the sliding track of Fuji II LC specimen was the greatest among all resin composites. Dyract AP showed the least wear with few surface damage. There is no significant difference in wear performance between conventional halogen light curing and light emitting diodes curing sources. It indicates that a light emitting diodes (LED) source can replace a halogen light source as a curing unit for composite resin restorations.

• 복식
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• 제39권
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• pp.79-89
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• 1998

This study was carried out the effect of stability and color extract for it's condition in the curcuma L.. dyeing. The stability is to investigate the absorbance of the curcumin, one of the major yellow pigments and the stability regarding the effect of light, oxygen temperature and pH. The dyeing condition is compared the effect of mordanting condition and the best way to extract pigment and analysed through the color-fastness rating, color-difference value test. The main results obtained are summarized as follows ; 1.The best and proper solvent to extrect curcumin pigment was a ethanol and a distilled water. 2. The light effect indicated that the absorbances of solution in absence of ligh was more stable. 3. The oxygen(O2) effect to curcumin show-ed that the condition in the absence of O2 was more stable than that in presence of O2 4. The temperature showed that the absorbnace was best stable in4$^{\circ}C$ and less changed at $25^{\circ}C$ 5. The curcumin-etanol solution was stable in pH 2~4. 6. Generally color-fastness rating to silk, wool and cotton indicated that crocking C.F. and perspiration C.F. were more than 3rd grade and dry cleaning C.F. was more than 4th grade. But light color-fastness and washing color-fastness were very poor. 7. To make good color fastness, the mordan-ting treated group and the pre-mordant conditions were more effective than others 8. When compared with color-difference value test indicated that the silk was looks like more reddish and bluish color and than the wool and cotton were greenish and bluish. As a mordant, A(C2H4OH(COOH3) and D(K2Cr2O7)were more effective to make green-ish color in the silk and the reddish color was abtained by B(Al.K(SO4)2.12H2O) and C(FeSO4.7H2O).

• 한국자원식물학회지
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• 제13권3호
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• pp.202-207
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• 2000

자생식물 16종의 종자형질 특성 및 저온습윤 및 변온 처리에 의한 발아양상을 조사하기 위하여 본실험은 수행되었다. 종에 따라 종자의 길이, 넓이, 폭은 각각 1.1∼8.9, 0.7∼7.5, 0.4∼l.7mm의 범위였으며 천립중은 0.1∼8.8g의 범위였다. 무처리에서 발아율이 가장 높은 종에 있어 냉이와 익모초는 암조건에서 각각 16, 36%이었으며 장구채와 각시취는 명조건에서 각각 69, 81%이었다. 참취, 고려엉겅퀴, 곰취, 질경이, 청옥취는 저온습윤처리 명조건에서 각각 84, 29, 57, 78, 95%로 물엉겅퀴는 암조건에서 30%로 발아율이 가장 높았다. 변온처리에서 발아율이 높은 종에 있어 두릅나무와 벌개미취는 명조건에서 각각 2,57%로, 수리취는 암조건에서 52%로 가장 높았다.

• 한국응용과학기술학회지
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• 제37권6호
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• pp.1798-1805
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• 2020

본 연구는 광원 중 낮은 출력의 미용기기용 LED 마스크의 모공, 주름, 피지 등 피부상태변화를 측정·비교하여 피부상태 개선에 대한 구체적인 효과를 수치적으로 검증하고자 하였다. 18명(통제군 4주, 실험군 4주)의 건강한 여성을 대상으로 매주 1회, 8주간 진행하였다. 모공, 주름, 피지의 피부상태 측정결과, LED 조사가 진행될수록 유의적으로 피부상태가 개선됨을 확인하였으며, 실험군과 대조군의 측정 시기별 집단 간 차이에서도 모공, 주름, 피지 모두 유의하게 나타났다(p<.001, p<.05). 이는 미용기기로서의 LED 마스크 개선 효과를 입증함으로써 학술적 의미에서 연속자료의 마련으로 임상정보와 양적자료로 제시될 수 있음에 의의가 있다. 또한 향 후, 더 많은 피부개선 효과를 입증하는 후속 연구가 이루어지기를 제언하는 바이다.