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RISS 인기검색어
- 검색키워드
- 저자 : Ahn Yongheon (검색결과 3 건)
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Development of cloud monitoring system for cosmic microwave background observations
Jeong Hoyong,Ahn Yongheon,Won Eunil,이경민 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.80 No.1
The cloud between a ground-based telescope and the sky signal, such as cosmic microwave background, can distort the measured temperature signal from the sky, or even obstruct it. We developed a cloud monitoring system for cosmic microwave background observations. This system uses infrared imaging sensors; therefore, it is independent of visible legibility and the monitoring is capable day and night. The sensors and their controller are protected by a weather-proof container and able to be installed at the bare ground exposed to the external environment. By our system, information of sky area covered by clouds can be provided for ground-based telescopes by 0.37◦ resolution. The design and fabrication of the cloud monitoring system as well as its initial performance are described.
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Jeongmin Park,Yongheon Han,Jaeyo Sin,Jeonghyun Ahn,오욱 인간식물환경학회 2023 인간식물환경학회지 Vol.26 No.5
Background and objective: The aim of this study was to elucidate the effect of varying treatment concentrations of twodifferent plant growth retardants, acting at different inhibition positions during the biosynthetic process, on the growthcharacteristics of geranium (Pelargonium × hortorum) and then to provide essential data to improve the quality of pot plantproduction. Methods: Aqueous solutions of diniconazole (Binnari) and daminozide (B-9) at concentrations of 0 (distilled water), 50, 100,200, and 400 mg⋅L-1 were prepared for the geranium 'Ringo 2000TM Deep Red'. These solutions were applied by foliarspraying twice at 10-day intervals. Growth characteristics such as plant height, leaf size and relative chlorophyll content(SPAD) were then assessed. Results: When Binnari was applied at concentrations of 0, 50, 100, 200, and 400 mg⋅L-1, the corresponding plant heightswere 29.5, 23.8, 24.1, 23.0, and 18.4 cm, respectively. There was a statistically significant decrease in plant height withincreasing concentration. Conversely, for B-9, plant height was significantly reduced to 26.7 cm only at the 400 mg⋅L-1concentration, indicating a less pronounced inhibitory effect compared to Binnari. Leaf width showed a significant decreasingtrend with increasing Binnari application concentrations and was 4.6, 4.7, 4.1, 4.2, and 3.9 cm respectively. However, therewas no significant difference due to the B-9 treatment. Chlorophyll content increased with increasing concentrations ofboth retardants. Conclusion: In conclusion, Binnari showed a greater inhibitory effect on geranium growth compared to B-9. The applicationof Binnari at 400 mg⋅L-1 resulted in the greatest increase in the ornamental value of the geranium. Furthermore, diniconazoleacts during the early stage before the splitting of the GA1 and GA4 pathways, thus inhibiting the biosynthesis of both activegibberellins. In contrast, daminozide inhibits the step just before GA1 biosynthesis. It is concluded that GA4 serves as thedominant active gibberellin in geranium plants.
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