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열차폐코팅용 GdO<sub>1.5</sub>-ZrO<sub>2</sub>계 희토류 지르코네이트 세라믹스의 상형성과 열물리 특성
김선주,이원준,권창섭,이성민,오윤석,김형태,임대순,김성원,Kim, Sun-Joo,Lee, Won-Jun,Kwon, Chang-Sup,Lee, Sung-Min,Oh, Yoon-Suk,Kim, Hyung-Tae,Im, Dae-Soon,Kim, Seongwon 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.6
Gadolinium zirconate, $Gd_2Zr_2O_7$, is one of the most promising candidates for replacing yttira-stabilized zirconia (YSZ) in thermal barrier coating (TBC) applications due to its low thermal conductivity and chemical stability at high temperature. In this study, rare-earth zirconate ceramics in the $GdO_{1.5}-ZrO_2$ system with reduced gadolinia contents were fabricated via solid-state reaction as well as hot-pressing at $1800^{\circ}C$. The phase formation, microstructure, and thermo-physical properties of these oxides were examined. The potential application of $GdO_{1.5}-ZrO_2$ ceramics for TBC was also discussed.
김선주,권형중,김일정,김필식,Kim, Sun Joo,Kwon, Hyung Joong,Kim, Il Jung,Kim, Phil Shik 한국농공학회 2016 한국농공학회논문집 Vol.58 No.5
This study was to design the optimal locations of the water level monitoring to quantify the agricultural water use in irrigation area supplied from an agricultural reservoir. In most of agricultural areas without TM/TC (Tele-Monitoring and Tele-Control) or monitoring network, irrigation water have been supplied on conventional experience and agricultural reservoir have been operated based on the operating simulation results by HOMWRS (Hydrological Operation Model for Water Resources System). Therefore, this study quantified the amount of agricultural water use in an irrigation area (Musu Reservoir, Jincheon-gun) by establishing water level monitoring network and analyzed the agricultural water saving effect. According to the evaluation of the economic values for water saving effect, the saving agricultural water of 1.7 million ton was analyzed to have economic values of 0.85 million won as water for living, and 1.78 million won as water for industrial use. It is identified to secure economic feasibility of the new water monitoring network by establishing one monitoring point in the entrance, irrigation area and endpoint through the economic analysis.
김선주,김형중,김필식,지용근,양용석,Kim, Sun-Joo,Kim, Hyung-Jung,Kim, Phil-Shik,Jee, Yong-Geun,Yang, Yong-Seok 한국농공학회 2006 한국농공학회논문집 Vol.48 No.3
Fallow paddy areas have been increased due to the import of cheap agricultural product, and the unbalance between farming cost and rice price since 1990. In domestic, rice production control that decrease paddy field area has been introduced for the control of rice demand and supply and stabilization of rice price since 2003. Because of the desire of paddy field's owner to create benefit by using paddy for other object, fallow paddy would be continuously increased. In the other aspect, many people in the world is suffering from hunger because of the shortage of food. In case of Korea, continuous drought and flood damages will be potential concern of stable food supply. From this viewpoint, the increasing fallow paddy area needs to be protected from the devastation by weed breeding for the re-cultivation. In this study, fallow paddy managed with the shallow pools and shallows was selected fur monitoring and analyzing of water quality and plant body change. As the results, the managed fallow paddy found to be effective in the purification of water quality and the control of plant growth.
기간별 저수 관리를 통한 소규모 댐의 밭 관개용수 확보
김선주,이주용,김필식,Kim, Sun-Joo,Lee, Joo-Yong,Kim, Phil-Shik 한국농공학회 2005 한국농공학회논문집 Vol.47 No.2
The objective of this study is securement of upland irrigation water using storage level management of small dams. However, it is not new development of water resources but securement of water using storage level management of existing dam. This study has enhanced the water utilization coefficient of dam, after extra available water had been calculated by application of periodical management storage level and this water is used to other water like the upland irrigation water demand. As the result of application, it can secure extra available water except the water requirement. Minimum extra available water except flood is about $20,000,000\;m^3$ and crop irrigation water demand of 10yr frequency is about $2,033,000\;m^3$ in Seongju. The utilization of crop irrigation water can be possible. And extra available water is about $3,102,000\;m^3$ in 2000, $1,959,000\;m^3$ in 2001 except flood period and crop irrigation water demand of 10yr frequency is about $2,272,000\;m^3$ in Donghwa. It is judged that extra available water cannot be used to crop irrigation water during the dry season in Dongwha. Consequently, when management storage level is determined and more efficient use of water is gotten like this study, water utilization coefficient will be enhanced.
김선주,이광야,권운혁,Kim Sun-joo,Lee Kwang-ya,Kwon Woon-hyuk 한국관개배수위원회 1995 한국관개배수논문집 Vol.2 No.2
Changes of meteorology, hydrological mechanism and discharge phenomena by the regional development have caused many technical, social and economical problems. Therefore, the regional development neglecting such changing parameters can provide considerable
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,이광야,양용석,Kim Sun-joo,Lee Kwang-ya,Yang Yong-suck 한국관개배수위원회 1997 한국관개배수논문집 Vol.4 No.2
Drought index calculation method using principal hydrological factors, such as precipitation amount and reservoir storage ratio, can estimate the duration and the intensity of drought. It is not easy to establish an universal criteria of drought, since th
강우시 축산 농가로부터의 질소$\cdot$인 유출에 관한 연구
김선주,김형중,Kim Sun-joo,Kim Hyung -Joong 한국관개배수위원회 1996 한국관개배수논문집 Vol.3 No.2
The outflow amount of the contaminants, especially nitrogen and phosphorus was investigated to find out the characteristics of the contaminants discharged from the dairy farm equipped with the livestock waste treatment facility by flood runoff. 1. The con
김선주,박기춘,박희성,Kim, Sun-Joo,Park, Ki-Chun,Park, Hee-Sung 한국농공학회 2012 한국농공학회논문집 Vol.54 No.1
Agricultural water reservoirs upstream of the intake on the basis of the intaking water volume is being made. Therefore, the supply capacity of reservoirs are not considered when the water balance analysis, storm water reservoirs are based on agriculture and further secured by the reservoir water is not used to using natural river water analysis. To overcome these problems can supply reservoirs are available to permit analysis of how much the quantity of water balance analysis, it should be reflected in the line to help. In this study, the natural daily flow data and apply the dimensions of the reservoir, and for more than 30 years of the long-term water balance analysis conducted by Date Youngsan river basin can supply reservoirs are large quantity of permits available is presented.