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김은범 ( Kim Eun-bum ),김남춘 ( Kim Nam-choon ),신지훈 ( Shin J I-hoon ),송원경 ( Song Won-kyeong ),김도희 ( Kim Do-hee ) 한국환경복원기술학회(구 한국환경복원녹화기술학회) 2017 한국환경복원기술학회지 Vol.20 No.3
With rapid urbanization and reckless urban development in the 21st century, the urban environment has gradually gotten worse, and urban heat island effect has been dramatically intensified. Thus, the importance of street greenery that can mitigate the urban heat island effect has further been highlighted. In this regard, this study was aimed at selecting suitable plant species for street greenery to reduce the urban heat island effect. Towards this end, five roads located in Seocho-gu, Seoul were selected as study sites, and plant species composition and difference of surface temperature were compared and analyzed in relation to the light transmittance. The street with the greatest temperature difference is Bangbae-ro(Platanus occidentalis). On the other hand, the road with the lowest temperature difference is Nambusunhwan-doro(Metasequoia Glyptostroboides). The effect of temperature reduction was found to be associated with light transmittance.Bangbae-ro(Platanus occidentalis) with the lowest light transmittance showed the highest temperature difference and Nambusunhwan-doro(Metasequoia Glyptostroboides) with the highest light transmittance showed the lowest temperature difference. It is analyzed that there are most differences in temperature when the amount of lights coming in between the crown is small. The temperature reduction effect can be obtained by planting deciduous broad-leaved trees. Also species with dense crown and broad width of crown will be able to maximize the effect of temperature reduction. In future studies, it will be necessary to expand the other species of trees in the street, and analyze the germicidal trees and shrubs as well as the differences in the packaging materials
김태국 ( Kim Tae-kook ),김남춘 ( Kim Nam-choon ),김은범 ( Kim Eun-bum ),구민규 ( Koo Min-kyu ) 한국환경복원기술학회(구 한국환경복원녹화기술학회) 2018 한국환경복원기술학회지 Vol.21 No.4
This research was thereby made to study and analysis ecological, landscape, and stability qualities of roadside cut Slopes in expressways and national highways that went through revegetation works. Also, evaluation items and framework for integrated assessment of plant structure and restored state for the maintenance were suggested. Following is the summary of the result. firstly, for stabilization of introduced native plant species on roadside cut slops, assessment on the post-project environmental management through long-term monitoring and maintenance works must be made. It signifies a form of authentic recovery and restoration by the native plants. second, current evaluation framework on the test beds is well managed with clear evaluation standards and table while its method of assessing the post management with only test bed results lacks conformity with this study site. Newly developed evaluation framework on the post construction sites is estimated to be used as assessment standards on any roadside construction sites. Third, after site investigation distinction was observed among different revegetating construction types in the long-term perspective. Due to the different duration time of vegetation state between seed-spray measures(degraded in time) and layer-spray measure(maintained), the use of coarse straw-mat mulching work or Coir net was suggested in long term maintenance of cut slopes. forth, segmentation of post environmental assessment is organized into three large categories of “ecological”, “stabile”, and “landscape” qualities regarding post restoration quality and stability of slope through native plants with which categories marks 50, 30, 20 points of rates. fifth, components of the post environmental assessment were segmented in twelve categories driving results from former experimental construction and newly focused items on site. In the future, it is possible to propose a customized assessment method considering the location and location of construction work if the research on the application of post-environment assessment methods for road construction surface recording is conducted systematically.
김은범,안기중 제주대학교 공과대학 첨단기술연구소 2004 尖端技術硏究所論文集 Vol.15 No.1
In this paper, I extend RED to improve the overall performance under DiffServ architecture, especially with AF services. Various RED parameters are dynamically changed according to the prediction of network load and its variations, enabling the easy adaptation to environment variation. The status or the degree of network congestion is evaluated with some prediction and the parameters, are adjusted dynamically with this feedback to resolve and improve the drawbacks of the existing RED. The simulation results show this extension of RED is improving the various performance measures such as link utilization, packet loss rate and throughput for each class to some extent.
김대영,김은범,안기중 제주대학교 공과대학 첨단기술연구소 2002 尖端技術硏究所論文集 Vol.13 No.2
Recently many studies have been done on the Random Early Detection as an active queue management and congestion avoidance scheme in the Internet. The AQM(Active Queue Management) of traffic congestion involves the policy which drops a packet for congestion avoidance. In this case, router drops one or more packets to improve the network performance before when the output buffer becomes full. In this paper, we overview the characteristics of the RED and the modified RED algorithms in order to understand the current status of these studies. Based on the RED parameter analysis, we propose a Dynamic RED Algorithm for Active Queue Management scheme to cope with this RED weakness. In this algorithm we make three parameters be adjusted depending on the queue status.
김동춘,김은범,안기중 제주대학교 공과대학 첨단기술연구소 2002 尖端技術硏究所論文集 Vol.13 No.2
This paper addresses the extended RED to be adapted in various network conditions for congestion control. RED has some problems in various network conditions due to the fixed operation of parameters. P_max and TH_min. That is, if the traffic load is relatively small the link utility can be too low and if the load is too large the management of queue can result in various difficulties. In this paper we propose the long-term queue average method in which those parameters of P_max and TH_min can be automatically adjusted based on the variations of network load. The experimental result shows that the proposed method can overcome the problems caused by RED.