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고정현 ( Jeung Hyun Koh ),허영진 ( Young Jin Hur ),최재용 ( Jae Yong Choi ) 한국환경복원기술학회 2011 한국환경복원기술학회지 Vol.14 No.3
The purpose of this study is to examine the ecologically suitable restoration characteristics in riparian slopes constructed by continuous fiber soil reinforced system (Geofiber system) which does not contain the concrete materials. The findings are as follows:(1) as the tested soil was not washed away by rainfalls and floods, Geofiber could replace the concrete wall and gravity stone net bag technique from the civil engineering structural point of view; (2) after one year of the construction, it was monitored that land cover ratio was 80-90%, which indirectly shows that vegetation is safely maintained; and (3) at the same time, 5-8 flora species were found in each test grid and more importantly dominant species have been moved from alien species to native herbaceous plants. From the above findings, Geofiber system is recommendable to restore the riparian slopes in terms of stability and natural landscape points. However, a long term monitering is needed considering flora succession process in a given environment as well as suitability tests should be carried out through the comparative investigations in other environments.
비탈면의 생태복원을 위한 연속섬유보강토의 적용성에 관한 연구
고정현 ( Jeung Hyun Koh ),허영진 ( Young Jin Hur ),이용구 ( Yong Gu Lee ),김남춘 ( Nam Choon Kim ) 한국환경보건기술학회(구 한국환경복원녹화기술학회) 2010 한국환경복원기술학회지 Vol.13 No.3
A technology using continuous fiber soil reinforcement system for the creation of ecological restoration in a damaged area has been developed and introduced. The continuous fiber soil reinforcement system (Geofiber system) is an environmentally friendly slope protection technique that continuous fiber soil reinforced layers are constructed with green plantation on cut slope. The characteristics of this system in terms of the strength and hydraulic performance, and the vegetation were investigated in this study. The main objectives of this comparative study was to quantify the potential contribution of geofiber system for the revegetation on the cut slope in a damaged area. A Geofiber system was constructed to reinforce the lower layer of slopes and revegetation methods including wood chips were carried out on the upper layer by machineries. The results of monitoring during 3 years on cut slopes were as follows: 1) All the quadrat existed in the proper range for vegetation. 2) Species richness was 4.4 (site-1) and 18.5 (site-2) respectively. 3) The averaged coverage rates of quadrats was 90%. It is remarkable that the continuous fiber soil reinforcement system would be capable of applying to a damaged area and also would serve maintaining a healthier environment for floras. However, it behooves to continue monitoring on succession of vegetation for ecological restoration.
임목폐기물 파쇄칩을 활용한 녹화기술의 비탈면 적용성에 관한 연구
고정현 ( Jeung Hyun Koh ),허영진 ( Young Jin Hur ),이용구 ( Yong Koo Lee ),김남춘 ( Nam Choon Kim ) 한국환경복원기술학회 2010 한국환경복원기술학회지 Vol.13 No.1
The main objectives of this comparative study were 1) to quantify the potential contribution of wood chips to revegetation on the cut slope in a constructed area, 2) to compare the floristic similarity of species composition whether existing of wood chips in the soil media or not. Wood chips were combined with soil media in the ratio of 30%. The thin layer (1 cm, 3 cm) soil media revegetation methods and the thick layer (10 cm) soil media revegetation method were constructed on the cut slopes by machineries respectively. Also, comparative experiments the existence of wood chips in the soil media were conducted to evaluate the effects of wood chips on revegetation works. The total size of quadrat was 300 m2 (100 m2 × 3). The results of monitoring for 3 years on cut slopes were as follows: 1) All the quadrat existed in the proper range for vegetation. 2) Species richness of quadrat including wood chips was 10% more than those of commercial soil medias. 3) The coverage rates of quadrat including wood chips were similar or superior to those of conventional methods. It can be concluded that the use of wood chips would be effective to promote establishment of diverse landscape and vegetation. However, it behooves to continue monitoring on succession of vegetation for ecological restoration. Finally, adequate wood chips deposit and gathering methods should be studied properly.
요시다 히로시,고정현,Hiroshi, Yoshida,Koh, Jeung-Hyun 한국환경복원기술학회 2005 한국환경복원기술학회지 Vol.8 No.2
The historical changes of seeding work in Japan, the typical slope revegetation method, is possible to divide into five periods as follows; 1) The early period after creation(1927-1948) 2) The spreading period of modern revegetation work with manpower(1947-1958) 3) The spreading period of rapid revegetation technique using exotic grasses with machineries(1959-1985${\dots}$) 4) The spreading period of rapid reforestation technique by fast growing species mainly using leguminous shrub species(1986-1995${\dots}$) 5)The developing period of nature restoration technique using endemic arborous species(1996-) The evaluation basis of vegetated condition after slope seeding has been described to a official guide book, "The Standards of Slope Stabilizing Works" It was mainly revised three times after first edition in 1972, and also the point of evaluation basis changed from the vegetation coverage to the density of woody plant through the 3rd period and the 4th period Recently main purpose of slope seeding has been developing from the erosion protection to the nature restoration in the current of the 5th period, and "The tentative guidelines of slope nature restoration" was announced by The Slope Revegetation Section of Japanese Society of Revegetation Technology in 2004. It was proposed the planning techniques of using suitable seeds/plants based on the preservation level at the real each construction sites Consequently, at present the importance of advanced monitoring methods for vegetation maintenance and plant sociologic survey to evaluate the plant succession is increasing.
허영진 ( Young Jin Hur ),고정현 ( Jeung Hyun Koh ),주백 ( Paik Joo ),안태영 ( Tae Young Ahn ) 한국환경복원녹화기술학회 2009 한국환경복원기술학회지 Vol.12 No.4
The main purpose of this study is as follows: Finding a solution for fresh wood chips to be used as an alternative growing-media through a study of the formation method of a compost base that is applicable on both construction site and composting factory to ferment fresh wood chips produced from construction site as well as a study on adjuvant or secondary materials. The result from the experiment plot using wood chips sized 50mm or less, manure and fertilizer mixed manure as a source of nitrogen to compost fresh wood chips has shown that the temperatures 9days and 3days after the beginning of the experiment reached to 49.0℃ and 40.4℃ respectively, the heating duration was 7days and 4days respectively, and the C/N ratio was 26.5 and 25.3, each satisfying the standard for composted manure (25.0~40.0). Also, the other result from another experiment plot using mixture of sandy soil and microorganism as an inoculation source of microorganism has shown that the temperature 10days after the beginning of the experiment reached to 67.6℃ and lasted 16days. The experiment plot using sandy soil has shown the highest figure of 5.3×108 CFU/g in terms of number of microorganism. The result from the experiment plots for on-site composting of fresh wood chips have shown that the experiment plot that used sandy soil with fertilizer due to supply restriction of manure as a nitrogen source in construction site reached the high temperature of 54.7℃ after 3days of experiment beginning and maintained heating state for 17days and reached 30.6 of C/N ratio, satisfying the standard for composted manure.
이용수,최창호,정하익,고정현,Lee. Yong-Soo,Choi. Chang-Ho,Chung. Ha-Ikn,Koh. Jeung-Hyun 한국방재학회 2008 한국방재학회 학술발표대회논문집 Vol.2008 No.1
2002년 태풍 ‘루사’로 인하여 재산피해가 약 5조 4,000억원 발생하였고, 도로 및 철도 등 주요시설물 피해는 12,377개소에서 약 2조 8,600억원으로 약 전체 피해액의 53%에 달했다. 2003년 태풍 ‘매미’에 의한 재산피해는 약 4조 2000억원으로 나타났다. 최근 2006년 7월 태풍 ‘에위니아’로 인한 재산 피해는 약 1조 4000억원으로, 도로 127개소, 하천 65개소 등의 주요 시설물이 유실 또는 침수 피해를 입었다. 따라서, 이상기후에 의한 매년 반 복되는 집중호우로 도로의 피해를 최소화하기 위하여, 본 논문은 도로의 피해 원인인 토석류를 고려한 도로 배수시설의 규격 결정 방안을 제시하였다. In addition the typhoon `Lusa` of year 2002 has resulted 5,400 billion won of property damage and the damages for roads and railroads were approximated to be 2,860 billion won at 12,377 locations holding 53% damage of total. It was reported that the property damage due to the 2003 typhoon, `Maemi` was 4,200 billion won. The recent typhoon, `Aewinia`, caused the 1,400 billion-won property damage including sweeping and flooding of 127 roads and 65 rivers, respectively. Therefore, this paper presented to estimate drainage size for debris flow