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김선주,여운식,이광야,Kim Sun-joo,Yo Woon-shik,Lee Kwang-ya 한국관개배수위원회 1994 한국관개배수논문집 Vol.1 No.2
The calculation method for the Drought index based on the principal hydrological factors, such as precipitation, reservoir storage and river discharge, can estimate the duration and intensity of drought. It is not easy to establish an universal criteria o
김선주,여운식,김형중,Kim Sun-joo,Yo Woon-shik,Kim Hyung-joong 한국관개배수위원회 1994 한국관개배수논문집 Vol.1 No.1
Recently an introduction of pipe drainage systems has been employed. Especially the necessity of pipe drainage systems has been widely recognized at farms in the suburban districts, however, undertaking itself cannot overcome an experimental stage. Theref
안태진,여운식,정광근,Ahn Tae-jin,Yo Woon-shik,Chung Kwang-kun 한국관개배수위원회 1998 한국관개배수논문집 Vol.5 No.1
The Power transformation, the modified Power transformation, the logarithmic transformation, the square-root logarithmic transformation, the SMEMAX transformation, the Extreme value type III, the Weibull, the log Pearson type III, the lognormal distributi
고광돈 ( Ko Gwang Don ),여운식 ( Yo Woon Shik ) 한국농공학회 1999 한국농공학회 학술대회초록집 Vol.1999 No.-
In 2000 FFIA. FIA. RDC are united into new corporation. This corporation will manage rural water with TM/TC(Tele-Monitoring/Tele-Control) system. Most systems which were adopted in TM/TC system were Closed Control System which use exclusive network and protocol. Closed Control System can not support new corporation's requirement in water management system. Therefore, new corporation should adopt Open Control System as standard rural water management system. Open Control System support Fieldbus technology, TCP/IP, various protocols, programming model, OPC which is essential to the water management program, and so on.
물옥잠을 이용한 수중처리방법에 의한 농공단지 폐수처리에 관한 연구
윤춘경 ( Yoon Chun Gyeong ),김형중 ( Kim Hyung Joong ),류재현 ( Ryu Jae Hyeon ),여운식 ( Yo Woon Shik ) 한국농공학회 1997 韓國農工學會誌 : 전원과 자원 Vol.39 No.3
Floating aquatic plant system using water hyacinth was applied to examine feasibility as a wastewater treatment system for the industrial complex in rural area. The wastewater from the industrial complex does not likely contain toxic pollutants because the industries which generate wastewater with toxic compounds are not allowed to move in. Pilot plant was installed at Baeksuk Nongkong Danzi in Chunahn-City, Chunchungnam-Do, and field study was performed during summer and fall of 1996. Hydraulic loading rate was 0.19m<sup>3</sup>/m<sup>2</sup> ·day. The effluent concentration of DO was higher than influent, and it implies that 0.6m depth reactor was reaerated enough to increase DO level. The influent concentration of BOD varied significantly from less than 30 to 120mg/ ℓ during the study period, however, effluent concentrations were generally lower than the water quality standard and removal efficiency was up to 85 %. The influent concentration of COD also showed wide variation from less than 40 to 160mg/ ℓ, and effluent concentration was higher than water quality standard when influent concentration was over 100mg/ ℓ. The influent concentrations of T -Nand T - P were lower than water quality standard and no further treatment was required, and these compounds were also removed in the system. Although some improvement and refinement are still required, overall, the floating aquatic plant system was proved to be feasible to apply to treat wastewater from industrial complex in rural area.
김선주 ( Kim Sun Joo ),이광야 ( Lee Kwang Ya ),여운식 ( Yo Woon Shik ),박재흥 ( Park Jae Heung ) 한국농공학회 2000 한국농공학회 학술대회초록집 Vol.2000 No.-
This study analyzes agricultural water demand nationwide which calculated by the estimation system for agricultural water demand(ESAD) with the data are observed in the other Studies. The results are as follows. Maximum, minimum and average values of annual evapotranspiration in paddy in 1,767 boundaries covering all the country are estimated as 819.2mm, 595.2mm and 702.9mm respectively. In the case of transplant seeding, the annual effective rainfall is estimated as 834.7mm to 464.3mm, while the average is 635.3mm. The amount of effective rainfall is largest in case of transplant seedlings and then come watered direct seeding and dry direct seeding regardless of region. Maximum, minimum and average values of annual evapotranspiration in upland in 1,767 boundaries are estimated as 659.97mm, 129.3mm and 411.8mm respectively. The annual effective rainfall is estimated as 607.2mm to 68.3mm while the average is 257.4mm. infiltration ratio in paddy in 1,767 boundaries applied in ESAD is 5.06mm/day in average, varying from 12.0mm/day to 2.0mm/day. Applied conveyance loss is 12.8% in average, varying from 18.0% to 8.0%.
부숙처리된 축산분뇨슬러리 살포지역의 강우에 의한 영양물질 유출에 관한 연구
김선주 ( Kim Sun Joo ),김형증 ( Kim Hyung Joong ),過修 ( Osamu Tsuji ),土谷富士夫 ( Fujio Tsuchiya ),여운식 ( Yo Woon Shik ) 한국농공학회 1997 韓國農工學會誌 : 전원과 자원 Vol.39 No.3
The nutrients runoff including nitrogen and phosphorous was investigated to find out the characteristics of nutrient discharge from the slurrigated area using digested animal manure. The results obtained are summarized as follows: 1. The concentrations of T-N, NH4-N, EC, T-P and CI- were high in flood runoff. 2. The concentration of nutrients by the surface runoff, except for NO<sub>3</sub>-N, showed a tendency of increasing when the period of dry days before the rain fall was long. And the concentration of NO<sub>3</sub>-N increased in the inflow section where subsurface drainage flowed in. 3. The quality of water was generally influenced by the discharge of water quantity from slurrigated area. However the runoff concentration influenced the water quality when it was high enough. 4. To reduce loss of the nutrients and improve the fertilization effect, it is not recommended to apply slurry in rainy season.
呂運植 건국대학교 1993 대학원 학술논문집 Vol.37 No.-
1.Paddy fields of Korea have a particularity different from the European countries that drain the excess soil water from the shallow surface soil layer 2.The facing problems on the planning and designing of sub-surface drainage are determining the spacing of main sub-surface drainage system, combination design of main & auxiliary sub-surface drainage system and the structure of sub-surface drainage ditch 3.When the spacing of main sub-surface drainage system is calculated as few meters, it is desirable to combine with the auxiliary sub-surface drainage system 4.The structure of sub-surface drainage ditch consist of drainage pipe and filling materials such as rice bran and pebbles. The width of sub-surface drainage ditch is 2Ocm in case of tren-cher operation and 3Ocm in case of back hoe excavation. The advisable depth of sub-surface drainage ditch is below 5Ocm.