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이찬우,김구연,장지덕,주기재 한국생태학회 2006 Journal of Ecology and Environment Vol.29 No.2
As a Biodiversity Management Plan in S. Korea, barley fields are being prepared for the winteringmigratory birds. However, the effectiveness of barley fields as a feeding habitat has not been evaluated. In 2003/04 wintering period, we installed exclosures in the barley fields to evaluate the waterfowl grazing effectiveness. Approximately 8,000 waterfowls used the Dongup Reservoir System and utilized the barley fields during the daytime. The white-fronted goose Anser albifrons occupied more than 90% of the all barley-feeding waterfowls. Waterfowls significantly impacted to the shoot density and biomass of barley. In the closed plot, 2in January, 2004. Shoot density in open plots (site 1) declined sharply from 15 December (18918/m2) to 5 January 2004 (2511/m2). However, barley shoot density in open plots (site 2) was stable in January 2004 because of human disturbances. The changes in barley biomass and shoot density showed similar trend in both open and closed plot. From the exclosure experiment, it was clear that barley fields were important feeding habitat for wintering waterfowls in this area. Further, human disturbances such as noise from traffic and other human activities (farming and hiking) had significant impact on waterfowls grazing activity. Collectively, winter barley fields were effective for waterfowl feeding, but the
이찬우 한국섬유공학회 2003 한국섬유공학회지 Vol.40 No.5
Various biodegradable polymers (PLLA-PEG-PLLA, PLLA-PPG-PLLA, PLLA-PN-PLLA) were synthesized and their affinities with cells were measured. Cell migration rate was more dependent on the cell density rather than on the characteristics of polymer. PLLA-PN-PLLA film showed formation of cohesive cell structure. The contact angle of this film was almost the same as that of PLLA. However, initial number of cell attachment of PLLA film was 3 to 4 times higher than that of PLLA-PN-PLLA copolymer film.
Terephthalate기가 도입된 PBS 공중합체의 제조 및 생분해 특성
이찬우 한국섬유공학회 2003 한국섬유공학회지 Vol.40 No.4
Poly(butylene succinate-co-terephthalate)(PBST) was synthesized and molecular weight and thermal properties were investigated. There was 10$0^{\circ}C$ change in the melting and crystallization temperatures of PBST with composition. As a result of manufacturing the produced polymer into film and conducting a decomposition experiment, it was observed that the film of S/T=1 and 2 composition ratio were decomposed by lipase PS. Moreover, after 42 days, 9 and 40% weight reduction was observed, respectively. However, since there was no change in the weight-average molecular weight, it appears that decomposition advances from the surface of the film.