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Samil Kho,Minsu Kim,Sunyoung Sohn,Donggeun Jung,Jinhyo Boo,Seonghoon Jeong,Sanghee Ko Park 한국진공학회(ASCT) 2005 Applied Science and Convergence Technology Vol.14 No.4
For the longevity of OLEDs, passivation of OLEDs is an important process step since organic materials used in OLEDs are very vulnerable to moisture. In this work, the passivation effect of the plasma polymerized para-xylene (PPpX) layers was studied. The PPpX layers deposited by PECVD were formed on top of the cathode with various plasma powers of 50?90 W. Passivation effect of PPpX was significantly dependent upon the deposition plasma power of the PPpX film. The lifetime of OLEDs with the 70 W deposited PPpX passivation layer was about 5 times longer than that of the control device.
차주완(Joo Wan Cha),정운선(Wooseon Jung),채상희(Sanghee Chae),고아름(A-Reum Ko),노용훈(Yonghun Ro),장기호(Ki-Ho Chang),서성규(Seongkyu Seo),하종철(Jong-Chul Ha),박동오(Dongoh Park),황현준(Hyun Jun Hwang),김민후(Min Hoo Kim),김경익(Kyung 한국기상학회 2019 대기 Vol.29 No.4
National Institute of Meteorological Sciences has conducted a total 54 cloud seeding experiments with a silver iodide and calcium chloride using aircrafts from 2008 to 2018. The goal of the experiments is to improve the techniques of precipitation enhancement in Korea. The cloud seeding experiments using the silver iodide and calcium chloride were 36 and 18 times, respectively. During the cloud seeding experiments of the silver iodide and calcium chloride, the average values of total cloud amount for two kinds of seeding materials were 9.6 for and 8.1, respectively. The cloud type with the highest occurrence was Nimbostratus (Ns)-Stratus (St) (58%) in the silver iodide cloud seeding experiment. It was Altostratus (As)-Stratocumulus (Sc) (44%) in the calcium chloride cloud seeding experiment. Compared to probability of obtaining cloud seeding effect of the experiments using a leased aircraft, the probability using an atmospheric research aircraft increased from 43% to 63% in the silver iodide cloud seeding experiment and from 29% to 75% in the calcium chloride cloud seeding experiment. However, the increasing tendency was only shown during the one year experiment (2018). To get the meaningful statistical tendency of the cloud seeding effects, it is needed to implement many experiments in several years. Further we have to more clearly understand the characteristics of clouds developing in Korea and implement the cloud seeding experiments under a variety of weather conditions in order to develop the optimized precipitation enhancement technology in Korea.
Kho Sam il,Kim Min Su,Sohn Sun Young,Jung Dong Geun,Boo Jin Hyo,Jeong Seong Hoon,Park SangHee Ko The Korean Vacuum Society 2005 Applied Science and Convergence Technology Vol.14 No.4
For the longevity of OLEDs, passivation of OLEDs is an important process step since organic materials used in OLEDs are very vulnerable to moisture. In this work, the passivation effect of the plasma polymerized para-xylene (PP$\rho$X) layers was studied. The PPpX layers deposited by PECVD were formed on top of the cathode with various plasma powers of 50 - 90 W. Passivation effect of PP$\rho$X was significantly dependent upon the deposition plasma power of the PP$\rho$X film. The lifetime of OLEDs with the 70 W deposited PP$\rho$X passivation layer was about 5 times longer than that of the control device.