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Go, Da-Hyeon,Jeon, Hee-Jeong,Kim, Tae-Hwan,Kim, Geun-Seok,Choi, Jin-Hee,Lee, Jae-Yeol,Kim, Jung-Ahn,Yoo, Hyun-Oh,Bae, You-Han The Polymer Society of Korea 2008 Macromolecular Research Vol.16 No.7
A new and useful poly(ethylene oxide)-based pH-sensitive block copolymer is introduced. Poly(ethylene oxide-b-N-phenylmaleimide) was first synthesized by anionic polymerization of N-phenylmaleimide (N-PMI) using mixed alkali metal polymeric alkoxide by sequential monomer addition method in the mixture of benzene/THF/DMSO (10/5/3, v/v/v) at room temperature. Reductive deimidation of the resulting block copolymer was performed using hydrazine monohydrate leading to the formation of the corresponding pH-sensitive poly(ethylene oxide-b-maleic acid).
Cho, Seok Hyeon,Heo, Su Been,Kang, Seong Jun IOP Publishing 2018 Japanese journal of applied physics Vol.57 No.3
<P>We developed a double-layer structured transparent electrode for use in flexible quantum-dot light-emitting diodes (QLEDs). Silver nanowires (AgNWs) and highly conductive poly(3,4-ethylenedioxythiophene): poly(styrene sulfonate) (PEDOT: PSS) were coated on a transparent substrate to obtain a highly conductive and flexible transparent electrode. The highly conductive PEDOT: PSS improved the surface roughness of the AgNWs transparent electrode film as well as the surface coverage area of the film. The double-layer structured transparent electrode showed superior mechanical properties than conventional indium-tin oxide (ITO) and AgNWs transparent electrodes. QLEDs with the double-layer structured transparent electrode also showed good reliability under cyclic bending conditions. These results indicate that the double-layer structured AgNWs/ PEDOT: PSS transparent electrode described here is a feasible alternative to ITO transparent electrodes for flexible QLEDs. (C) 2018 The Japan Society of Applied Physics</P>
고성석(Go Seong-Seok),박현구(Park Hyeon-Ku),송도흠(Song Do-Heom),여상구(Yeo Sang-Ku) 대한건축학회 2011 대한건축학회논문집 Vol.27 No.7
Work plate is a main reason to cause crash accident and leads to death disaster. This study aimed to analyze the fundamental reason for the accidents, and carried out visit survey the 102 construction sites. The results were analyzed for the state of use and installation, and finally an evaluation was performed for the degree of risk of work plate. It is meaningful to quantify the degree of risk by the items to observe when using work plate, in the construction fields using work plate to be expected where there is strong reliability. The results need revision or complementary of related instructions, and could be applied to establish the plan for safety management effectively.
Yu Seok Jung,Seong Hyeon Yong,Do Hyeon Kim,Kwan Been Park,Seung A Cha,Ji Hyun Lee,Woo Whan Jang,Myung Suk Choi 경상대학교 농업생명과학연구원 2023 농업생명과학연구 Vol.57 No.3
To improve the quality of jujube (Zizyphus jujuba Miller var. hoonensis), which is a fruit of health functional, the effect of polyphenol preparation treatment on the fruit characteristics of two cultivars (cv. Bokjo and cv. Sangwang) of jujube was investigated. There was no difference in the height and breast diameter of jujubes tested between the polyphenol treatments and non treatment. Jujube trees treated with polyphenol preparation produced significantly more fruit than untreated in both cultivars. In cvultivar of Bokjo, the polyphenol preparation treatment increased the fruit's fresh weight and dry weight more than two times, respectively, compared to the untreated treatment. Polyphenol preparation tr eatments also changed the leaf characteristics of jujube trees. In the polyphenol-treated trees, leaf thickness tended to be thickest at the top and thinnest at the bottom. Polyphenol preparation treated jujube trees showed no difference in chlorophyll content. Moisture content was slightly higher in the untreatment than in the treatments. Visually, the polyphenol preparation treatment had a dark green color. Jujubes treated with polyphenol preparations showed differences in polyphenol content in fruits. The polyphenol content in both peel and flesh of the treatments were much higher than that of the untreatment. Reducing sugar was contained more in the peel than in the flesh and was higher in the untreatment than in the polyphenol preparation treatments. Treatment with polyphenol preparation showed differences in fruit appearance. As described above, it was found that the treatment of polyphenol preparation changed the leaves, fruit shapes and components of jujube trees. In particular, jujubes treated with polyphenol preparations are expected to contribute significantly to eco-friendly and highly functional jujube cultivation, as they appear to produce many fruits and increase the content of polyphenols and sugars.