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아파트 단지 내 조경수목의 생장특성 분석 -대구광역시 메트로팔레스단지를 대상으로-
정문화 ( Mun Hwa Jung ),정성관 ( Sung Gwan Jung ),최철현 ( Chul Hyun Choi ),신재윤 ( Jae Yun Shin ),유주한 ( Ju Han You ) 한국산림과학회 2015 한국산림과학회지 Vol.104 No.1
The purpose of this study is to offer the raw data for improving the method of landscape planting in apartment complex by objective surveying and analysing the growth ratio by type and ground planted in landscape tree. The results are as follows. In the survival ratio of tree, Pinus densiflora was the highest and Abies koreana was the lowest in evergreen tree. In case of deciduous tree, the species of the highest survival ratio were Diospyros kaki, Zelkova serrata, Prunus mume, Lagerstroemia indica and Ginkgo biloba. There showed that Sorbus commixta and Chaenomeles sinensis had the lowest survial ratio. In case of tree growth by types, Pinus strobus was the highest and Pinus densiflora var. globosa was the lowest among evergreen trees. Among deciduous trees, the growth ratio of Zelkova serrata was the highest, and the trees showed the lowest growth were Lagerstroemia indica, Magnolia denudata and Cornus officinalis. Pinus strobus, Cornus kousa, Ginkgo biloba, Chionanthus retusa and Acer palmatum were good growth in natural ground, and Zelkova serrata and Prunus armeniaca var. ansu were good in artificial ground. In the future, if you study the growth characteristics and shrubs that are excluded from the study of landscape trees in various locations are expected to derive objective data.
기계적 합금화 p-type FeSi<sub>2</sub>의 플라즈마 용사 성형 및 열전 특성
최문관,어순철,김일호,Choi Mun-Gwan,Ur Soon-Chul,Kim IL-Ho 한국재료학회 2004 한국재료학회지 Vol.14 No.3
P-type $\beta$-FeSi$_2$ with a nominal composition of $Fe_{0.92}Mn_{0.08}Si_2$ powders has been produced by mechanical alloying process. As-milled powders were spray dried and consolidated by atmospheric plasma thermal spraying as a rapid sintering process. As-milled powders were of metastable state and fully transformed to $\beta$-$FeSi_2$ phase by subsequent isothermal annealing. However, as-thermal sprayed $Fe_{0.92}Mn_{0.08}Si_2$ consisted of untransformed mixture of $\alpha$-$Fe_2Si_{5}$ and $\varepsilon$-FeSi phases. Isothermal annealing has been carried out to induce transformation to the thermoelectric semiconducting $\beta$-$FeSi_2$ phase. Isothermal annealing at $845^{\circ}C$ in vacuum gradually led to the thermoelectric semiconducting $\beta$-$FeSi_2$ phase transformation, but some residual metallic $\alpha$ and $\varepsilon$ phases were unavoidable even after prolonged annealing. Thermoelectric properties of $\beta$-$FeSi_2$ materials before and after isothermal annealing were evaluated. Seebeck coefficient increased and electric conductivity decreased with increasing annealing time due to the phase transition from metallic phases to semiconducting phases. Thermoelectric properties showed gradual increment, but overall properties appeared to be inferior to those of vacuum hot pressed specimens.
‘N’ 자원회수시설 광역화에 따른 소각량 증대 운영 결과
최종균(Chong-Gun Choi),이후만(Hu-Man Lee),박관선(Gwan-Sun Park),임문재(Mun-Jae Lim),윤용승(Young-Sung Yun),이승무(Seung-Mu Lee),이수구(Su-Goo Lee),신동훈(Donghoon Shin) 한국연소학회 2008 KOSCOSYMPOSIUM논문집 Vol.- No.-
Facility safety verification and improvement needs to apply extra incineration rate of 'N' MSW incinerator with neighbor local governments for cooperative utilization. The purpose of this paper is to estimate the propriety incineration rate through operation data from the single or couple unit working test in the existing facilities. The problems during the various incineration rate operations are investigated by the dioxin measurements process temperatures and computational fluid dynamics (CFD) simulation. As the incineration rate increased, the gas temperature of furnace exit increase accordingly, which reaches above 1000 ℃ at 80 % incineration rate. The flue gas temperature at the superheater inlet reached the peak temperature of 660 ℃ at over 80 % incineration rate. As the incineration rate increased, CO emission shows low relationship, but NOx is straightly increase with the incineration rate and the peak is 35 ppm at 83 % incineration rate. The dioxin is satisfied with the standard regulation, but results are more than the target(0.01 ng-TEQ/N㎥). CFD is used of find the reason of generation at clinker of combustion chamber wall when the incineration rate is above 75 %, and these results show that the study for cooling of the combustion chamber and the more suitable flow pattern needs to increase incineration rate.