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고랭지 밭 토양유실 방지를 위한 폴리머 소재(폴리아크릴아마이드 및 바이오폴리머)의 현장적용성 평가
최용범(Yong Beom Choi),최봉수(Bong Su Choi),김세원(Se Won Kim),이상수(Sang Soo Lee),옥용식(Yong Sik Ok) 大韓環境工學會 2010 대한환경공학회지 Vol.32 No.11
본 연구에서는 경사도 20%의 강원도 경작지 실험포장(가로 3 m×세로 18 m)을 대상으로 자연강우 조건하에서 폴리머 기반 토양개량제인 polyacrylamide (PAM) 및 바이오폴리머의 처리가 토양유실 및 작물의 생장에 미치는 영향을 평가하였다. 40 kg/ha PAM 및 바이오폴리머 처리시 토양입단 안정도는 대조구에 비해 최대 11% 증가하였다. 생육조사 결과 폴리머 처리에 따라 무(Raphanus sativus)의 엽장은 증가하였으나 수확량의 경우 유의적인 차이를 나타내지는 않았다(P>0.05). 토양유실의 경우 폴리머 기반 토양개량제 처리시 토양유실량이 최대 41% 감소하였으나 유거수량에는 유의적인 차이가 없었다. 또한 토양유실량은 강우강도의 증가에 따라 대수관계(R2 = 0.85)로 증가함을 확인하였다. 이상의 결과로부터 피복이 완전치 못한 경사지 경작지에 대한 폴리머 기반 토양개량제 시용은 토양유실 저감에 효과적이며 작물생육 촉진 및 토양질 향상에도 기여할 수 있을 것으로 판단된다. Use of polymeric soil amendments is an emerging way to reduce soil erosion, and improve crop productivity and soil quality. Objective of this study was to evaluate the effects of anionic polyacrylamide (PAM) and synthetic biopolymer on soil erosion, crop growth and soil quality. The aqueous solutions of PAM and biopolymer at 40 kg/ha were applied to loamy soil plots (3 m width by 18 m long) having a 20% slope during radish (Raphanus sativus) cultivation. Results showed that PAM and biopolymer treatments increased aggregate stability up to 11% compared to the untreated control. Treatments of PAM and biopolymer also increased leaf length of radish but there was no significant difference in crop yield. Soil loss was decreased by up to 41% using the polymeric soil amendments; however, no difference in runoff was found, compared to the untreated control. Soil loss was logarithmically increased against an increase in rainfall intensity (R2= 0.85). Our findings suggest that proper use of polymeric soil amendments would be beneficial to maintain soil quality and reduce soil erosion in sloping uplands.
최봉수(Bongsu Choi),홍기찬(Ki Chan Hong),남재작(Jae Jak Nam),임정은(Jung-Eun Lim),이현용(Hyeon Yong Lee),최용범(Yong-Beom Choi),주진호(Jin Ho Joo),양재의(Jae E Yang),옥용식(Yong Sik Ok) 韓國雜草學會 2009 Weed&Turfgrass Science Vol.29 No.1
바이오에너지 생산을 위해 국가정책으로 확대 재배되고 있는 유채의 수확 후 잔유물을 녹비로 환원할 경우 벼 재배지에서 잡초발생과 생육억제에 미치는 영향을 평가하였다. 유채 추출무루에 의한 상추종자의 발아율은 꼬투리 추출물에서 농도 증가에 따라 억제 효과가 가장 높았는데 1.3%와 2.5% 농도에서 각각 20%와 80%까지 억제시켰고 5% 농도에서는 전혀 발아하지 못했다. 그러나 뿌리 추출물에서는 대조구와 차이가 없었다. 상추종자의 초기생육은 모든 추출물의 농도가 증가함에 따라 지상부의 생육은 촉진시킨 반면 지하부의 생육은 억제시켰는데 이는 토양으로부터 양분과 수분의 흡수에 영향을 미쳐 식물의 생육을 억제시키는 원인이 될 것으로 판단된다. 한편 유채의 녹비환원에 따른 잡초의 발생은 관행처리구의 6종/pot의 초종을 확인한 것에 비해 3종/pot으로 현저히 감소시켰으며 발생본수도 88% 억제시켰다. 이는 잡초의 생장에도 영향을 미쳤는데 관행처리구에 비해 유채만을 녹비환원한 처리구에서 건물생산량을 85% 억제시켜 지속농업을 위한 유채의 녹비이용 가능성을 제시할 수 있을 것으로 판단된다. In recent, rapeseed (Brassica napus) has been cultivated as a biomass resource for biodiesel production in the southern part of Korea. Objective of this research was to evaluate the potential of rapeseed residue on suppression of weed growth in rice-rapeseed double cropping system. Rates of lettuce (Lactuca sativa L.) seed germination were reduced as the incorporation rate of aqueous pod extracts increased. The similar patterns were observed by the treatment of aqueous pod extracts. Radicle length of lettuce seedling was significantly reduced as aqueous extracts concentration increased. However, hypocotyl length of lettuce seedling showed opposite trend. Rapeseed residue incorporation as green manure inhibited the occurrence of weed species more than 50% compared to the conventional rice cropping system in the pot experiment. Subsequently, rapeseed residue inhibited weed density and biomass by 88% and 85%, respectively, compared to the conventional cultivation. These findings suggested that the utilization of rapeseed residue as green manure can be an alternative practice to control weeds in rice-rapeseed double cropping system.
농업부산물을 이용한 유가금속 회수기술 개발: 밤 부산물의 팔라듐(Palladium) 흡착특성
홍기찬 ( Ki Chan Hong ),최용범 ( Yong Beom Choi ),최봉수 ( Bong Su Choi ),김남원 ( Nam Won Kim ),양재의 ( Jae E Yang ),옥용식 ( Yong Sik Ok ) 강원대학교 농업생명과학연구원(구 농업과학연구소) 2009 강원 농업생명환경연구 Vol.20 No.-
Biosorption has emerged as an innovative and economical method to recover base metals from aqueous wastes. The objective of this research was to evaluate the feasibility of waste chestnut as a new biosorbent to recover palladium from industrial wastewater. This study is a part of a larger project to develop precious metal recovery process using agricultural by-product produced in Korea. Batch-type adsorption experiment was carried out to determine palladium adsorption in an aqueous solution by chestnut shell. Result showed that Langmuir isotherms adequately described palladium adsorption with R2 of 0.999. The maximum adsorption capacity using Langmuir model revealed that chestnut shell can remove palladium in an aqueous solution up to 9.09 mg g-1. The mechanism of palladium adsorption by chestnut shell was evaluated by characterizing surface properties, functional group and chemical composition of chestnut shell using SEM-EDS and FT-IR analyses. The overall experimental results suggest that waste chestnut can be used for palladium biosorption from industrial wastewater.
이종희(Jong Hee Lee),채수진(Su Jin Chae),최용범(Yong Beom Choi),윤춘식(Chun Sik Youn),한원석(Won Seok Han),은희철(Hee Chul Eun) 대한피부과학회 2002 대한피부과학회지 Vol.40 No.9
N/A Background: As part of medicines shift in emphasis toward primary patient care, clinical curriculum is very important in the education of medical students, There are excellent opportunities for general 1earning of clinical skills especially in dermatological clinical clerkship course, Objective: The purpose of this study is to evaluate the dermatological clerkship with questionnaire by students. We would like to find out and look into the way how to improve the clerkship course. Methods: 103 students filled in well-structured questionnaires after they had finished a 2 week-clinical clerkship course of Department of Dermatology. The questionnaire consisted of overall evaluation of clinical clerkship, of subtypes of clinical clerkship course, and the way how to evaluate students. After finishing the clinical clerkship course, 10 students were interviewed with the results of the questionnaire. Results: Most students were generally pleased with the didactic quality of clerkship. The course of observation of outpatient clinic among various subtypes of clinical clerkship were favored most by the students. The newly developed educational contents revealed not to be properly used. Faculty activity was also scored to be better than average. The test for clinical clerkship was regarded a little difficult to the students. Conclusion: The evaluation of didactic quality of clinical clerkship seems very important in the improvement of medical education. The development of the more valid and reliable questionnaire is needed. The overall evaluation of clerkship by various perspectives such as students, faculties, patients and institutions will provide more improvement of quality of clerkship at Dermatology department. (Korean J Dermatol 2002;40(9) : 1089~1099)