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제주지방에서 키토산 처리가 가을감자의 생육과 수량에 미치는 영향
박용봉,양국남,김기택 (사) 한국생물환경조절학회 2001 시설원예‧식물공장 Vol.10 No.4
This experiment was conducted to investigate the effect of chitosan on the growth and yield of fall-planted potatoes. The research was carried out in fall-planted potatoes from August 2000 to April2001 at the height of 250 m above sea level in Jeju Island. Soaking for 30 min. of seed potatoes in 20times diluted solution of 3% liquid chitosan shortened days to emergence by 4 to 6 days. Stem length,number of stems and number of stolons per plant were 56.5 cm, 4.3, and 19.0, respectively, when seedpotatoes were soaked for 30 min. in 20 times diluted solution of 3% liquid chitosan. Total potatoyield in this treatment reached 2,963 kg per 10a and was significantly greater than in other treat-ments. Yield of marketable tubers (greater than 30 g) per 10a for treatment of seed potatoes soakingin 20 times diluted solution of 3% liquid chitosan and for treatment of foliage spray with 200 timesdiluted solution of 3% liquid chitosan plus chitosan powder (10 kg per 10a) mixing with soil was2,761 kg and 2,628 kg, respectively. Contents of Mg, Fe and B were the greatest in the treatment of 30min. soaking of seed potatoes in 200 times diluted solution of 3% liquid chitosanm. The increased con-tents of these elements are considered to have caused yield increase as a result of increased chloro-phyll content for photosynthesis.
임호남,선우양국,김철위 대한치과기재학회 1984 대한치과재료학회지 Vol.11 No.1
The purpose of this comparative study was to evaluate the diametral tensile strength of commercially available dental amalgams used in Korea. For this study, six kinds of Korean amalgams and nine kinds of imported amalgams were used. Diametral tensile test specimens were prepared in 4×8mm. stainless steel cylindrical molds and the prepared specimens were stored in 37±1℃ and 100% relative humidity conditions. Diametral tensile strength measurements were made on an Instron testing machine for five specimens, at 15 minutes, 1 hour, 24 hours and 7 days, using a cross head speed of 0.05mm/min. The results obtained in this study were as follows; 1. The diametral tensile strength of the high-copper amalgams were higher than that of the conventional amalgams. 2. The diametral tensile strength after fifteen minutes of Korean amalgams much better than the imported amalgams and the final diametral tensile strength of Korean products were also increased.
치과용 Composite resins의 간접인장 강도에 관한 연구
선우양국,김철위,임호남 대한치과기재학회 1982 대한치과재료학회지 Vol.9·10 No.1
The purpose of this study was to evaluate the diametral tensile strengths of commercially available dental composite resins used in Korea. For this study, the specimens were transferred to an environment of 23℃±2℃,50%±10% humidity and at a water of 37℃±1℃. Diametral tensile test specimens were prepared in 6×12mm stainless steel cylindrical molds and tested at 1/2 hour, 1 hour, and 24 hours. The results obtained in this study were as follows; 1. It can be seen that, a significant difference of diametral tensile strength values for composite resins was observed with various time intervals and commercial products. 2. It was found that the diametral tensile strength of composite resins tested in water at 37℃± 1℃ has a tendency to higher the strength than in air at room temperature.
폴리카보네이트 필름 표면 처리가 증착 SiOx 베리어층 접착에 미치는 영향
김관훈(Gwan Hoon Kim),황희남(Hee Nam Hwang),김양국(Yang Kook Kim),강호종(Ho Jong Kang) 한국고분자학회 2013 폴리머 Vol.37 No.3
폴리카보네이트(PC) 필름을 유연기판으로 사용하기 위해서는 SiOx 증착에 의한 베리어 특성 개선이 필요하며 이때 베리어 층과 PC 계면 접착력이 매우 중요하다. 본 연구에서는 언더 코팅, UV/O3 및 저온 플라즈마와 같은 다양한 표면 처리 방법에 의하여 PC 필름 표면을 개질하여 표면의 물리적 화학적 변화가 증착된 베리어 층 계면 접착력에 미치는 영향을 살펴보았다. 표면 처리 전의 PC 필름은 표면 거칠기 및 표면 에너지가 매우 낮아 SiOx 베 리어 층과의 접착력이 현저히 떨어짐을 알 수 있었다. PC 필름을 저온 플라즈마로 표면 처리한 결과, 표면의 거칠 기 증가와 극성 관능기 생성에 의하여 극성 표면 에너지가 향상되는 반면 UV/O3 처리의 경우, 표면 거칠기 변화 없이 표면에 생성된 극성 관능기에 의해 극성 표면 에너지가 증가됨을 알 수 있었다. 이러한 표면의 변화는 베리어 층과 PC 기판의 계면 접착력 증가에 기여함을 알 수 있었다. 표면 처리 방법으로 언더 코팅을 사용하는 경우 표면 에 에너지를 가하지 않아도 코팅제의 아크릴산과 SiOx의 접착력 향상에 의하여 PC 필름과의 계면 접착력이 증가되며 유무기 하이브리드 다층 구조에 의한 베리어 특성 개선이 함께 일어남을 알 수 있었다. The interfacial adhesion strength is very important in SiOx deposited PC film for the barrier enhanced polycarbonate (PC) flexible substrate. In this study, PC films were treated by undercoating, UV/O3 and low temperature plasma and then the effect of physical and chemical surface modifications on the interfacial adhesion strength between PC film and SiOx barrier layer were studied. It was found that untreated PC film shows significantly low interfacial adhesion strength due to the smooth surface and low surface free energy of PC. Low temperature plasma treatments resulted in the increase of both surface roughness and surface free energy due to etching and the appearance of polar molecules on the PC surface. However, UV/O3 treatment only shows the increase of surface free energy by developed polar molecules on the surface. These surface modifications caused the enhancement of surface interfacial strength between PC film and SiOx barrier. In the case of undercoating, it was found that the increase of surface interfacial strength was achieved by adhesion between various acrylic acid on acrylate coated surface and SiOx without increase of polar surface energy. In addition, the barrier property is also improved by organic-inorganic hybrid multilayer structure.