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정대영,심상렬 한국조경학회 2000 韓國造景學會誌 Vol.28 No.1
Covering rate, visual rating and sod development were evaluated under three natural fiber materials with Phragmites spp. when over a plastic sheet. The results were as follows. (1) The last covering rate was high on jute net, coir mat and on Miscanthus sacchariflorus, respectively while the early covering rate was high on coir mat and on Miscanthus sinensis+perennial ryegrass. (2) The early growth was good on perennial ryegrass but the covering rate gradually turned poor because of summer drought. (3) Sod was highly developed on Phragmites japonica, Miscanthus sacchariflorus and Miscanthus sinensis compared with other species and mixtures. (4) The covering rate and visual rating were high on natural fiber materials such as coir mat and jute net when compared with on natural fiber materials such as none treatment plots. (5) The natural fibers materials on Phragmites spp. and Miscanthus spp. were effect on sod establishment. Sod coir mat was highly established. (6) The carpet-type sod was best developed on the coir mat.
Solvent-Selective Chitosan Hydrolysates: Antibacterial Activity
정대영,김규현,이용현,박용일,신대철,이응택,박제권 한국키틴키토산학회 2022 한국키틴키토산학회지 Vol.27 No.1
This study was carried out to very precisely understand the effect of solvent selection on the molecular properties in the investigation of the biological activity according to the molecular size of chitosan. Chitosan hydrolysates derived from the hydrolysis of high molecular weight chitosan (HMWC) were prepared in enzymatic hydrolysis under solvent selective conditions. Chitosan hydrolysates were characterized by HPLC and Matrix-Assisted Laser Desorption/ Ionization-Time of Flight (MALDI-TOF) mass spectrometry analyses, respectively. HPLC analysis did not show a significant difference in the size of hydrolysates according to the type of chitosan. On the other hand, it was confirmed that each molecular size was significantly different from the results presented by HPLC with MALDI-TOF mass spectrometry analysis. In addition, the effect on the antibacterial activity of the hydrolysates of chitosan, designated to “active molecular chitosan (AMC)”, by the solvent selected for the enzymatic reaction also showed a significant difference. Therefore, it is intended to suggest that the selection of solvents for the enzymatic reaction for chitosan hydrolysis and their antibacterial activity is very important
정대영 국립특수교육원 1994 현장특수교육 Vol.1 No.-
장애의 정의를 규명하는 것은 장애를 지닌 개인에게 제공할 여러가지 서비스의 개념적, 철학적 및 실천적 방향을 제시해 주므로 매우 중요하고 의의있는 일이다. 이러한 맥락에서 학습장애와 관련된 전문가들과 연구단체들은 이 장애의 정의를 구며하고자 다각적으로 시도하여 왔으나, 학습장애는 특수하고 다양한 하위장애로 구성되어 있는 특성으로 인하여 각 전문분야에서 만족할 수 있는 합일된 정의를 체시하지 못하고 있는 실정이다. 또한 학습장애의 정의를 연구자나 연국집단의 학문적 배경이나 전문성에 따라 특수한 목적에 부합되는 정의를 단편적으로 모색해왔기 때문에 저의의 다양화가 가속화되는 특징을 보여주고 있다. 이러한 현상은 의학에서 연구가 시작되어 심리학, 특수교육학 및 직업재활학 등의 관련 분야로 확대되어 각 학문영역에서 해결하고자 하는 주요관심영역에 초점을 맞추어 접근하고 있는 접근 목적과 목적달성을 위한 접근 방법상의 차이에서 온 결과로 생각된다.