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김용완,홍석영,김이현,장민원,Kim, Yong Wan,Hong, Suk Young,Kim, Yi Hyun,Jang, Min Won 한국농공학회 2012 한국농공학회논문집 Vol.54 No.6
This study carried out farmland suitability analysis for southern-type garlic cultivation considering soil and temperature as well as water deficit conditions. The spatial extent was limited within the area derived by Kim et al. (2012) using just soil and temperature constraints. Daily soil moisture was simulated using a one-layer soil water balance model at a $100{\times}100m$ grid unit, and then annual water deficit was calculated from 2000 to 2010. The farmland suitability was classified as four steps: best suitable, suitable, possible, and low productive. As a result, total area of best suitable or suitable farmland was about 375,900 ha, and Gimje-si and Haenam-gun were appeared as the largest favorable area for southern-type garlic cultivation. The best suitable or suitable area at Haenam-gun, Goheung-gun, Shinan-gun, Namhae-gun, and Muan-gun, major production regions of southern-type garlic, were extracted as 20,187 ha, 13,018 ha, 4,715 ha, 1,319 ha, and 349 ha, respectively. On the other hand, the result showed that the adoption of sprinkler irrigation systems might be critical in cultivating the southern-type garlic at some regions having poor water balance.
김용완,홍석영,장민원,Kim, Yong-Wan,Hong, Suk-Young,Jang, Min-Won 한국농공학회 2011 한국농공학회논문집 Vol.53 No.5
The objective of this study is to decide a spatial interpolation method on temperature data for the suitability analysis of garlic cultivation. In Korea, garlic is the second most cultivated condiment vegetable after red pepper. Nowadays warm-temperate garlic faces potential shift of its arable area according to warmer temperature in the Korean Peninsula, and the change can be drawn with the precise temperature map derived from interpolation on point-measured data. To find the preferable interpolation method in cases of germination and vegetative period of the garlic, different approaches were tested as follows: Inverse Distance Weighted (IDW), Spline, Ordinary Kriging (OK), and Universal Kriging (UK). As a result, IDW and UK show the lowest root mean square errors as for the germination and vegetative seasons, respectively. However, statistically significant difference was not revealed among the applied methods regarding the germinating period. Eventually this will contribute to mapping the suitable lands for the cultivation of warm-temperate garlic reasonably.
김용완(Yong-Wan Kim),장민원(Min-Won Jang),홍석영(Suk-Young Hong),김이현(Yi-Hyun Kim) 한국토양비료학회 2012 한국토양비료학회지 Vol.45 No.2
본 연구는 난지형 마늘의 생육시기별 기온을 고려하고 토양조건을 반영하여 난지형 마늘의 재배적지를 분석하였다. 그 결과 난지형 마늘의 재배적지는 영·호남지방을 중심으로 분포되었다. 그 중 최적지와 적지로 분류된 면적이 많은 지역은 나주시 14,058 ha, 정읍시 13,845 ha, 고창군 12,278 ha, 진주시 11,055 ha, 창녕군 9,713 ha 등으로 나타났으며, 난지형 마늘 주생산지의 경우 무안군이 5,216 ha, 해남군 5,092 ha, 고흥군 3,212 ha, 신안군 2,253 ha, 남해군 958 ha로 각각 분석되었다. 그리고 토지이용조건을 추가로 고려하여 분석한 결과와 주생산지의 실제 난지형 마늘재배 면적을 비교한 결과 고흥군과 신안군이 실제 재배면적과 비슷하게 분석되었으며 해남군과 무안군은 실제재배면적보다 크게 나타났고 남해군의 경우는 분석결과가 작게 나타났다. 작물 재배는 여러 가지 생육조건과 사회적 영향 등을 고려하여 이루어지므로 난지형 마늘의 실제 주생산지와 본 연구에서 나타난 난지형 마늘 재배적지는 다소 차이가 있다. 하지만 향후 우리나라에서 난지형 마늘 재배 시 본 연구에서 도출된 재배적지 분석결과를 이용하게 되면 난지형 마늘의 효율적인 재배가 가능 할 것으로 사료되며 보다 효율적인 재배적지 분석을 위해서는 차후 토양과 기온조건 외에도 농업수리 등 다른 변수들도 고려되어야 할 것으로 사료된다. This study was carried out to evaluate the land suitability for southern-type garlic cultivation associated with both temperature and soil constraints. The suitability analysis was conducted with hourly temperature data from 2001 to 2010 at all fifty seven meteorological stations and the soil-based suitability map of garlic provided by Rural Development Administration. Firstly the temperature data were processed by the growth stages (germinating, bulbing, and winter vegetation season), and then were adopted to limit the irrelevant lands. Next, as a result of overlaying each soil and temperature suitability map, the total 274,339 ha of area was mapped as highly suitable or suitable for southern-type garlic cultivation and the top four of the largest classified si-guns were identified as Naju, Jeongeup, Gochang, and Jinju. On the other hand, the statistical records of KOSIS (KOrea Statistical Information Service) showed lower amount of cultivation area than the analyzed results in the major production sites, Goheung, Sinan, Haenam, and Muan. However, it should not be regarded as exceptional because farmer’ preference might not correspond to potential land usability.
Analysis of Creep Behavior of Alloy 617 for VHTR Application
Woo-Gon Kim(김우곤),Jae-Young Park(박재영),I.M.W. Ekaputra,Min-Hwan Kim(김민환),Seon-Jin Kim(김선진),Yong Wan Kim(김용완) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Creep rupture data were obtained from a series of creep tests with different applied stresses at 850℃, 900℃ and 950℃ of Alloy 617, which is considered as a prime candidate material for the VHTR application. On the basis of the creep experimental data, the analysis of creep rupture behavior was performed using various creep relations and laws such as Norton’s power law, Monkman-Grant Relationships (MGR), Modified Monkman-Grant Relationships (MMGR), creep damage tolerance factor λ, and Zener-Hollomon Parameter (Z), and then the creep constants used in these equations were determined. The MMGR appeared to be more narrowed in data scattering than the MGR, and it followed well a straight line of m ? 1.0 as m=0.97. In the plot of the Z parameter vs. stress, it obeyed a straight line of the slope of n’=5.87 regardless of the three different temperatures. It would be thus inferred that the same creep mechanism was operative within the present stress and temperature ranges, and creep damage tolerance factor of Alloy 617 was found to be 2.40.
Comparison of Creep Crack Growth Rates on the Base and Welded Metals of Modified 9Cr-1Mo Steel
Woo-Gon Kim(김우곤),Jae-Young Park(박재영),Song-Nan Yin(윤송남),Sung-Ho Kim(김성호),Yong-Wan Kim(김용완),Seon-Jin Kim(김선진) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
This paper is to compare creep crack growth rates (CCGR) on the base metal (BM) and welded metal (WM) of modified 9Cr-1Mo steel for Gen-IV reactors. Welded specimens were prepared by Shielded Metal Arc Weld (SMAW) method. To obtain material properties for the BM and welded metal, a series of creep and tensile tests was conducted at 600℃, and CCG tests was also performed using 1/2 compact tension specimens under different applied loads at 600℃. Their CCGR behaviors were analyzed by using the empirical equation of the da/dt vs. C<SUP>*</SUP> parameter and compared, respectively. It appeared that, for a given value of C<SUP>*</SUP>, the rate of creep propagation was about 2.0 times faster than in the WM than the BM. This reason is that a creep rate in the WM was largely attributed when compared with that in the BM. From this result, it can be utilized for assessing the rate of creep propagation on the BM and WM of the G91 steel.