http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Urban Forest Monitoring in Korea since 1991: Case Study on Daegu Metropolitan City
Kwon, Jino,Cho, HyunJe,Choi, MyoungSnb,Park, Chan-Ryul,Sung, Joo-Han,Cho, Jae-Hyoung,Kim, Sunhee,Park, Jonggyun,Oh, Jeong-Hak Korean Society of Forest Science 2006 한국산림과학회지 Vol.95 No.5
To have better urban forests in future we are focusing on two major issues like other countries. How we could have more urban forest-quantitative approach-against the expanding of urbanization, and how we could produce better urban forest-qualitative approach-to give a chance in contact with better nature for urban people. Prime surveys on urban forests have been carried out in 6 major cities since 1991, and the city of Daegu which is located on the east southern area of Korea have been case studied for qualitative approaches during last 3 years. Major species of the remnant forests were Pinus densiflora, Pinus rigida, Pinus thunbergii and Robinia pseudoacacia. Approximately 20% of the surveyed forests were lost their structure as forests caused by illegal farming, facilities and as the bare ground by excessive visitors. Generally speaking the condition of forests for biotope was very poor in overall. From two years data of monitoring of birds, we found that wooded parkways and woodland squares had more species than street tree areas. Nests were found mainly on the branch of Zelkova serrata, Pinus densiflora and Quercus myrsinaefolia. The size of urban forests mainly determined the species richness of birds. According to the oxygen output and carbon input by photosynthesis measurement, the capability was in order of Platanus occidentalis, Zelkova serrata and Ginko biloba. Air conditioning effects of trees through transpiration measurement was found and the quality of forests also related to the reducing of urban heat-island.
권기량(Kwon Kiryang),변융태(Byeon Yoong-Tae),김진오(Kim JinO) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
The railway is required to be highly reliable, which carries a lot of passenger and baggage. Presently, the reliability prediction method is based on independent failure. If the common cause failure affecting many components simultaneously in a system occurs, the system has seriously an aptitude to be broken out. Therefore, for raising the reliability of the railway power system, it is introduced that the analysis is conducted to use the common cause failure. The common cause failure is modeled and is combined with independent failure. Furthermore in order to examine the method, it is applied to the railway power substation. If this method is used to the power system, the reliability of the railway power system will be highly improved.
Effect of F-inclusion in nm-thick MgO tunnel barrier
Jun Hyung Kwon,Jino Lee,Tesu Kim,차국린 한국물리학회 2009 Current Applied Physics Vol.9 No.4
We investigated the electrical characteristics of MgO tunnel barriers while we add F during oxidation process of nm-thick Mg layer. Specifically we measured dI/dV and d2I/dV2 data of MgO tunnel barriers as we add F. When comparing the data of magnesium oxyfluoride tunnel barriers to those of aluminum oxyfluoride data, we have found that effect of F-inclusion in MgO is different from that in AlOx; F-inclusion in MgO barrier makes the barrier more symmetric while F-inclusion in AlOx barrier makes the barrier more asymmetric. However, the d2I/dV2 data of MgO did not change much even after F-inclusion, suggesting a very small amount of F-doping can make significant change in oxidation process of nm-thick Mg layer. We believe this result from the fact the oxidation process of nm-thick Mg layer is reaction-limited while the oxidation process of Al layer is diffusion-limited.
Park, Chanwoo,Koo, Namin,Kwon, Jino,Lim, Joo-Hoon,Jeong, Yong-Ho,Kim, Jung-Ho 한국토양비료학회 2014 한국토양비료학회지 Vol.47 No.1
This study was conducted to determine the changes in soil chemical properties and the growth of seedling according to the different dredged soil improving methods at slope of Saemangeum sea dike. Undersea dredged soil was improved by five different methods. Seedlings of Ulmus davidiana var. japonica, Chionanthus retusa, Celtis sinensis, and Pinus thunbergii were planted after 9 month of experience site installation, then soil pH, NaCl concentration in soil, soil organic matter (SOM), and survival rate and height of seedling was measured. Initial soil pH was highest in the control plot but it decreased to the similar level with other soil improving plots after 35 months. There were no differences in NaCl concentration between the control and soil improving plots, and it showed decreasing tendency during the study period. In the control plot, initial SOM was lowest among that of other plots during the study period. The survival rate of 36 months after planting of P. thunbergii was highest among the species. The gap of the tree growth of P. thunbergii between the control plot and the soil improving plots was small, however, other species showed relatively higher tree height in the soil improving plots than the control plots. Creation forest with P. thunbergii might be a cost effective afforestation in coastal reclaimed land since it rarely needs additional improvement of dredged soil.
Chanwoo Park,Namin Koo,Jino Kwon,Joo-Hoon Lim,Yong-Ho Jeong,Jung-Ho Kim 한국토양비료학회 2014 한국토양비료학회지 Vol.47 No.1
This study was conducted to determine the changes in soil chemical properties and the growth of seedling according to the different dredged soil improving methods at slope of Saemangeum sea dike. Undersea dredged soil was improved by five different methods. Seedlings of Ulmus davidiana var. japonica, Chionanthus retusa, Celtis sinensis, and Pinus thunbergii were planted after 9 month of experience site installation, then soil pH, NaCl concentration in soil, soil organic matter (SOM), and survival rate and height of seedling was measured. Initial soil pH was highest in the control plot but it decreased to the similar level with other soil improving plots after 35 months. There were no differences in NaCl concentration between the control and soil improving plots, and it showed decreasing tendency during the study period. In the control plot, initial SOM was lowest among that of other plots during the study period. The survival rate of 36 months after planting of P. thunbergii was highest among the species. The gap of the tree growth of P. thunbergii between the control plot and the soil improving plots was small, however, other species showed relatively higher tree height in the soil improving plots than the control plots. Creation forest with P. thunbergii might be a cost effective afforestation in coastal reclaimed land since it rarely needs additional improvement of dredged soil.
Mixed Sulfur and Iodide-Based Lead-Free Perovskite Solar Cells
Nie, Riming,Mehta, Aarti,Park, Byung-wook,Kwon, Hyoung-Woo,Im, Jino,Seok, Sang Il American Chemical Society 2018 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.140 No.3
<P>The use of divalent chalcogenides and monovalent halides as anions in a perovskite structure allows the introduction of 3<SUP>+</SUP> and 4<SUP>+</SUP> charged cations in the place of the 2<SUP>+</SUP> metal cations. Herein we report for the first time on the fabrication of solar cells exploiting methylammonium antimony sulfur diiodide (MASbSI<SUB>2</SUB>) perovskite structures, as light harvesters. The MASbSI<SUB>2</SUB> was prepared by annealing under mild temperature conditions, via a sequential reaction between antimony trisulfide (Sb<SUB>2</SUB>S<SUB>3</SUB>), which is deposited by the chemical bath deposition (CBD) method, antimony triiodide (SbI<SUB>3</SUB>), and methylammonium iodide (MAI) onto a mesoporous TiO<SUB>2</SUB> electrode, and then annealed at 150 °C in an argon atmosphere. The solar cells fabricated using MASbSI<SUB>2</SUB> exhibited power conversion efficiencies (PCE) of 3.08%, under the standard illumination conditions of 100 mW/cm<SUP>2</SUP>.</P> [FIG OMISSION]</BR>