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柳點鎬,崔善英,金濟桓,李康壽 全北大學校 1993 論文集 Vol.35 No.-
In order to find out the influence of shading degree on the growth, pod setting, protein contents, RuBPCase activity, photosynthesis and yield in soybean plants, two soybean varieties, Hill and Etaka were cultivated under the 0%(full sun light), 20%, 65% and 90% shading conditions. Protein contents, RuBPCase activity and photosynthesis of leaves in Hill were decreased linearly with the higher shading, but those in Etaka were increased up to 20% shading, and then decreased more rapidly than Hill when the shading was above 65%. Pod sets were decreased with the higher shading degree, and those of the degree were severe in upper nodes. The stem heights were increased in accordance with the shading up to 65%, but stem diameter and No. of branches were decreased linearly with the higher shading degree. The yield of Hill was decreased linearly with the higher shading degree, but that of Etaka were increased up to 20% shading, and decreased inure severely than Hill when the shading was above 65%. From the above results : Etaka is more suitable than Hill to weak shading which occurred in the case of intercropping, companion cropping and alternating cropping, and the shading degree must not go over above 20%.
大豆에 있어서 生育初基의 斷水處理가 還元糖 및 α-amylase에 미치는 影響
柳點鎬,崔善英,李康壽 全北大學校 1988 論文集 Vol.30 No.-
In order to obtain the basic information for clarifying the mechanism of water stress, effects of water removal (15 days after emergence) on dry weight, chlorophyll and reducing sugar content, α-amylase activity and isozyme pattern were investigated in the early growth stage of soybean plant. The results are as follows. 1. Dry weight of shoot was increased in both the control and the treatment, but the degree of increase was remarkably lower in the treatment than that in the control. After 9 days of the treatment, it was decreased about 42% compared to the control. 2. Water content(%) and chlorophyll content in the leaves showed nearly unchanged in the control, but remarkable decrease in the treatment. After 9 days of the treatment, they came to 60% and to 4.5mg.g DW and decreased 26% and 42%, respectively, compared to the control. 3. Reducing sugar content and α-amylase activity in the leaves remained at almost constant level in the control, but showed almost linear increase in the treatment. After 9 days of the treatment, they came to 26mg/g DW and to 20 units, and reached about 2 and 1.6 times, respectively, compared to the control. 4. α-amylase isozymes showed only b (light stained) and c (dark stained) isozymes in the control and remained in color intensity during the period of investigation, while, in the treatment, a new a band was observed 3 days after the treatment, and a and b isozmes also became dark stained condition from 7 days after the treatment.
Response of Different Seedlings to Growth and Yield in Yacon
Ryu, Jeom-Ho,Doo, Hong-Soo,Lee, Kang-Soo,Choi, Sun-Young,Cheong, Young-Keun,Park, Ki-Hun The Korean Society of Crop Science 2002 Korean journal of crop science Vol.47 No.5
The seedlings of yacon (Polymnia sonchifolia Poeppig & Endlicher), which were cuttings, plug seedling (PS), crown bud before sprouting (CBBS), crown bud after sprouting (CBAS), and divided seedling after budding (DSAB) were planted at 70$\times$50 cm planting distance on ridge; that was interow spacingintrarow spacing, and about 28,500$\pm$71 plants/ha. CBBS didn't need work and equipment to raise seedlings. PS and DSAB grew taller to 140.5 and 143.3cm, respectively, than others at 150 days after planting. In the changes of plant height, PS and DSAB showed taller than others during growth period, cuttings, CBBS, and CBAS grew rapidly in middle growth stage. Excepting main stem and petiole length, other characters were significant for seedling. Fresh weights were different among seedlings. Even though the yield of plants grown from CBAS and CBBS were lower with 34.7 and 36.4 ton/ha, respectively, than 3.6 ton/ha of DSAB; its yield index were over 95%, hence, those of plants grown from cutting and PS were lower with 73 and 87%, respectively. The ratio of tuberous roots over 200g to total tuberous roots per plant was the highest from DSAB. Most of tuberous roots were under 200g per tuberous root from cuttings. CBBS, CBAS, and DSAB are suitable to use seedlings for high yield of yacono. Yacon plant by DSAB much produced tuberous root of over 200g.
Effect of Plant Density on Growth Responses and Yield in Yacon
Ryu, Jeom-Ho,Doo, Hong-Soo,Lee, Kang-Soo,Park, Sun-Young The Korean Society of Crop Science 2001 Korean journal of crop science Vol.46 No.5
This study was conducted to determine the optimal planting distance in cultivation of yacon (Polymnia sonchifolia Poeppig & Endlicher). Plug seedlings were planted with 6 different plant densities of 80 $\times$ 60, 80 $\times$ 50, 70 $\times$ 50, 70 $\times$ 45, 70 $\times$ 40 and 60 $\times$ 45 cm. The plant height and the petiole length were increased with increasing the planting distance. The tallest plant height of yacon was 165.4cm with the plant density of 80 $\times$ 60 cm. However, branch number per plant, leaf number on main stem and stem diameter were not significantly difference among planting densities. Tuberous root was harvested 31.42 tons/ha in 70 $\times$ 50 cm spacing. The ratio of heavier tuberous roots than 200 g to total tuberous roots decreased significantly according to increase of planting density. Fresh weights of shoot and root, contain the crown bud, were decreased, as planting distance was shorter. Tuberous root number was fewer but its weight was heavier in wide planting than in dense planting. We think that optimal planting density is about 30,000 plants/ha, if it were to be 70 cm row spacing, intrarow spacing should calculate about 47cm.
3 MWth 급 케미컬루핑 연소시스템 설계에 의한 규모격상 타당성 연구
류호정(Ho-Jung Ryu),이도연(Doyeon Lee),남형석(Hyungseok Nam),조성호(Sung-Ho Jo),이승용(Seung-Yong Lee),원유섭(Yoo Seob Won),백점인(Jeom-In Baek) 한국에너지기후변화학회 2019 에너지기후변화학회지 Vol.14 No.1
Conceptual, basic and detail design procedure was performed to check the feasibility of 3 MWth chemical looping combustion system which is capable of high-pressure steam generation. Chemical looping combustion design program was used and mass and energy balances were solved based on assumed constants and variables. After that, the basic design of each reactor, solid circulation loop, cyclones and utilities were also performed. Moreover, sensitivity analysis of key parameters, such as difference of solid conversion between two reactors, was conducted to check the effect on solid circulation rate and reduction rate. Based on the conceptual and basic design results, three-dimensional layout drawing of the 3 MWth chemical looping combustion system was developed. Finally, the effects of air reactor temperature and solid circulation rate on high pressure steam generation rate and fuel reactor temperature were investigated.
기포유동층 반응기에서 산소전달입자의 기체연료별 환원반응 특성
류호정(Ho-Jung Ryu),김하나(Hana Kim),이도연(Doyeon Lee),조성호(Sung-Ho Jo),이승용(Seung-Yong Lee),백점인(Jeom-In Baek) 한국에너지기후변화학회 2021 에너지기후변화학회지 Vol.16 No.1
Reduction characteristics of oxygen carrier particle for different gaseous fuels such as methane, syngas and LPG were measured in a bubbling fluidized bed reactor. For all gaseous fuels, high CO₂ selectivity was achieved at high temperature more than 800 °C. Moreover, CO₂ selectivity decreased as the temperature decreased and as the fuel flow rate increased because limitation of oxygen supply from the oxygen carrier. However, CO₂ selectivity increased as the solid height in the reactor increased due to the increment of oxygen supply from more oxygen carrier and the increment of gas residence time in the reactor. Consequently, we could conclude that the high reaction temperature, low gas velocity, and high oxygen carrier inventory are preferable to ensure high reactivity of oxygen carrier in the fuel reactor.