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대구 지방의 수평면에 입사된 태양 자외선-A의 1994년 현황
서계홍,민봉희 大邱大學校附設 基礎科學硏究所 1998 基礎科學硏究 Vol.14 No.2
Solar UV-A radiations incident on a horizontal surface at Taegu of Korea in 1994 were calculated with 5 minute averages of measurements taken every 30 seconds by a broadband UV-A sensor. Raw signal voltages from the sensor were converted to the units of watt/m2 by the simple linear relationship. The maxima of monthly averages and daily UV-A radiations were observed 552.46 and 705.68 kJ/m2/day, respectively. The maximum of instantaneous UV-A radiations in 1994 was 29.62 W/m2 at 13:00 on July 04.
대구 지방의 수평면에 입사된 태양 자외선-B의 1998년 후반기 현황
서계홍,민봉희 大邱大學校附設 基礎科學硏究所 1998 基礎科學硏究 Vol.15 No.2
Solar UV-B radiations incident on a horizontal surface at Taegu of Korea in the last half of 1998 were calculated with 5 minute averages of measurements taken every 30 seconds by a broadband UV-B sensor. Raw signal voltages from the sensor were converted to the units of watt/m2 by the simple linear relationship. The maxima of monthly averages and daily UV-B radiations were observed 7.407 in Sep. and 17.462 kJ/m2/day on Sep. 18, respectively. The maximum of instantaneous UV-B radiations in the period of observation was 1.230 W/m2 at 12:45 on July 13.
대구 지방의 수평면에 입사된 태양 자외선-A의 1998년 전반기 현황
서계홍,민봉희 大邱大學校附設 基礎科學硏究所 1998 基礎科學硏究 Vol.15 No.1
Solar UV-B radiations incident on a horizontal surface at Taegu of Korea in the first half of 1998 were calculated with 5 minute averages of measurements taken every 30 seconds by a broadband UV-B sensor. Raw signal voltages from the sensor were converted to the units of watt/m2 by the simple linear relationship. The maxima of monthly averages and daily UV-B radiations were observed 23.103 in May and 33.113 kJ/m2/day on may 22, respectively. The maximum of instantaneous UV-A radiations in the period of observation was 1.126 W/m2 at 12:30 on June 10.
서계홍 대구대학교 산업기술연구소 1988 産業技術硏究 Vol.7 No.-
The winter respiration in a mongolian oak stand was simulated with the computer program. The amount of CO₂ evolved by the winter respiration of the stand was estimated 43.52 ton CO₂ ha^(-1) and the amount of CO₂ evolved by the Q_(10) method was estimated 54.75 ton CO₂ ha^(-1) which was 25.8% more than the result by this method.
대구 지방의 수평면에 입사된 광합성 광자선속밀도의 1998년 후반기 현황
서계홍,민봉희 大邱大學校附設 基礎科學硏究所 1998 基礎科學硏究 Vol.15 No.2
Solar photosynthetic photon flux density (PPFD) incident on a horizontal surface at Taegu of Korea in the last half of 1998 were calculated with 5 minute averages of measurements taken every 30 seconds by a quantum sensor. Raw signal voltages from the sensor were converted to the units of mmole m^(-2) s^(-1) by the simple linear relationship. The maxima of monthly averages and daily PPFD were observed 24.790 in Sep. and 42.285 mole m^(-2) day^(-1) on Aug. 4, respectively. The maximum of instantaneous PPFD in the period of observation was 2.067 mmole m^(-2) s^(-1) at 12:45 on Aug. 5.
서계홍 대구대학교 산업기술연구소 1988 産業技術硏究 Vol.7 No.-
Carbon dioxide balance of an individual mongolian oak was modelled based on the equations from the meteorological data and the relationship between organs and the gas exchange rates. Gross productivity, total respiration, and net productivity of an individual mongolian oak were estimated 13.2, 6.1, and 7.1kg CO₂/month, respectively.
대구 지방의 수평면에 입사된 광합성 광자선속밀도의 1998년 전반기 현황
서계홍,민봉희 大邱大學校附設 基礎科學硏究所 1998 基礎科學硏究 Vol.15 No.1
Solar photosynthetic photon flux density(PPFD) incident on a horizontal surface at Taegu of Korea in the first half of 1998 were calculated with 5 minute averages of measurements taken every 30 seconds by a quantum sensor. Raw signal voltages from the sensor were converted to the units of mmole m^(-2) s^(-1) by the simple linear relationship. The maxima of monthly averages and daily PPFD were observed 37.811 in May and 52.483 mole m^(-2) day^(-1) on May 30, respectively. The maximum of instantaneous PPFD in the period of observation was 2.332 mmole m^(-2) s^(-1) at 11:00 on June 23.
Reflectance water index를 이용한 참나무속 3종 낙엽의 함수량 추정
서계홍 ( Kyehong Suh ) 한국환경과학회 2018 한국환경과학회지 Vol.27 No.4
Water status of intact plants has been optically estimated by measuring reflectance at the wavelengths 1,450 nm and 1,900 nm based on their signal strengths. Although another water band at 970 nm is considered to have very small signals, the band apparently lies within the detection range of inexpensive spectrometer and plain charge-coupled device (CCD) camera used in wild fire studies. However measurement of the reflectance at 970 nm has been rarely applied to estimate the water status of dead plant materials such as fallen branch, twig, and leaf. To test the possibility of applying water reflectance at 970 nm to estimate the water content (WC) in leaf litter, the reflectance in various WC values were measured in the leaf litter of three Quercus species (Q aliena, Q aliena, Q mongolica, and Quercus variabilis). The results showed that the WC in the leaf litter can be determined by reflectance water index (WI) in the three Quercus species (WC=1,450×WI-1,378.8, r=0.865). However, there was no interaction effect in the relationship between WI and WC among the litter of the three Quercus species.
강낭콩의 엽생장 , 확산저항 및 순광합성율에 (純光合成率) 미치는 수분스트레스의 영향
서계홍(Kye Hong Suh),김준호(Joon Ho Kim) 한국식물학회 1981 Journal of Plant Biology Vol.24 No.2
Effects of water stress on leaf growth, leaf diffusive resistance and net photosynthetic rate were studied on the first trifoliate leaves of snapbean(Phaseolus vulgaris L.) grown under controlled environmental conditions in a growth cabinet. As the drying cycle progressed, leaf water potential, relative water content and the net photosynthetic rate were decreased, but the leaf diffusive resistance was increased. Leaf growth in the elongation and the area was the most sensitive, but the net photosynthetic rate was the least sensitive to water stress. The grade of the leaf photosynthetic rate was the least sensitive to water stress. The grade of the leaf diffusive resistance after recovery was not affected by the different degrees of water stress experienced during the drying cycle but the recovering time attained to the control level was delayed. The leat diffusive resistance was not affected at leaf water potential above -8 bars, but increased rapidly below that value.
급격한 광도 변화가 담배 잎에서 반사되는 Normalized Difference Vegetation Index에 미치는 영향
서계홍 ( Kyehong Suh ) 한국환경과학회 2017 한국환경과학회지 Vol.26 No.4
Normalized Difference Vegetation Index (NDVI) has played an important role in assessing green plant biomass through remote sensing on global scale since the early 1970s. The concept of NDVI is based on the fact that green plants show higher reflection in near-infrared region than in visible region of the electromagnetic spectrum. However, it is well known that the relocation of chloroplasts in plant leaf cells may dramatically change the optical properties of plant leaves. In this study I traced the changes in the reflectance and transmittance properties of Tobacco leaves at the wavelengths of 660 and 800 nm after a sudden increase in light intensity. The results showed that NDVI of leaves gradually decreased from 72.7% to 69.9% when exposed to a sudden increase in light intensity from 30 to 1,200 μmol/m<sup>2</sup>·s. This means that the error resulting from the physiological status of the plant should be accounted for a more precise understanding of ground truth corresponding to the data from the remotely acquired images