http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
류정욱(Jung-Wook Ryu),이홍열(Hong-Yeol Lee),오세영(Se-Young Oh) 한국식품영양과학회 1999 한국식품영양과학회지 Vol.28 No.2
알긴과 키토산은 생분해성 천연고분자로 알려져 있다. PVA는 수용성 패킹, 종이, 섬유산업에서 사용한다. PVA/algin, PVA/chitosan필름을 생분해성 필름으로 사용하기 위하여 알긴, 키토의 무게혼합비율에 따라 용액블랜딩법에 의하여 제조하였다. 제조한 블랜드필름의 열적, 기계적 성질을 DSC, 인장강도, 신장강도와 SEM에 의한 형태 변화로 확인하였다. 결과적으로 10wt% PVA/chitosan일 때가 순수 PYA와 유사한 열적, 기계적성질을 가졌으며, PVA/algin은 알긴의 혼합비율이 25wt%를 넘으면 상분리현상을 나타내었다. PVA/Algin은 혼합비율이 10wt% 이내일 때 부분적인 상용성을 나타냄을 DSC, 기계적 성질과 SEM으로 확인하였다. TOC법에 의한 분해실험에서 블랜드필름은 pH 7.0, 10.0 완충용액에서보다 pH 4.0 완충용액에서 빠르게 분해가 일어났으며 pH 완충용액에서보다 효소용액에서는 더욱 빠른 분해를 나타내었다. Algin and chitosan are known as biodegradable natural polymers. PVA is useful for the production of water-soluble packaging, paper, textile sizes. PVA/Algin and PVA/chitosan films were prepared by solution blends method in the weight ratio of chitosan, algin for the purpose of useful biodegradable films. Thermal and mechanical properties of blend films such as DSC, impact strength, tensile strength and morphology by SEM were determined. As a result, The ratio of 10.0wt% PVA/chitosan films were similar to PVA at thermal and mechanical properties. PVA/Algin films were found that phase separation was occured as more than 25wt% increasing the blend ratio of algin. PVA/Algin films were observed to be less partially compatibility than 10wt% increasing the blend ratio of algin by DSC, mechanical properties and SEM. Blend films were completely degraded pH 4.0 better than 7.0, 10.0 in the buffer solution. Also, they were rapidly degraded in the enzyme(β-glucosidase) solution better than pH solution by enzymolysis.
송전선로 드론 순시·정밀점검 운용 및 공공용 드론길 구축방안에 대한 연구
우정욱,박준영,김석태,이재경,류서현,Woo, Jung-Wook,Park, Joon-Young,Kim, Seok-Tae,Lee, Jae-Kyung,Ryu, Seo-Hyeon 한국전력공사 2020 KEPCO Journal on electric power and energy Vol.6 No.3
KEPCO Research Institute developed a GIS-based autopilot drone inspection system for electric power facilities and since its pilot application in 2017, it has been successfully used to detect defects in power transmission lines. This paper presents how to operate this system in the field of power line inspection. Power transmission lines are located in a wide variety of environments such as plains, mountains, river crossings, sea crossings, and industrial areas. Among these, some transmission lines are difficult for human workers to access because of their geographies and some should be checked more often due to their severe contamination. Considering these field conditions, we classified drone operation in two categories to increase its effectiveness and efficiency - patrol surveillance and detailed inspection tasks. This paper describes the detailed procedures of the two tasks above and their field application experiences. In addition, this paper newly proposes how to construct public drone roads by using the information of KEPCO's power transmission lines.
2-Fluorenylidene chalcone 유도체에 대한 Thioglycolic acid 의 친핵성 첨가 반응에 관한 연구
이기창,이광일,황용현,류정욱,윤철훈 ( Ki Chang Lee,Kwang Il Lee,Yong Hyun Hwang,Jung Wook Ryu,Cheol Hun Yoon ) 한국유화학회 1996 한국응용과학기술학회지 Vol.13 No.1
Fluorenylidene chalcone derivatives were synthesized by condensation. The structure of these compounds were ascertained by means of UV melting point IR and ^1H-NMR spectra. The nucleophilic addition reaction kinetics of Thioglycolic acid to fluorenylidene chalcone was investigate by UV in 20% dioxane-H_2O at 25℃. The rate equation which were applied over a wide pH1.0~13.0 range. On the basis of general base catalysis and sonfirmation of addition reaction product, the nucleophilic addition reaction kinetics of thioglycolic acid to fluorenylidene chalcone were measured by the pH change. From the result of the above caption, a plausible nucleophilic addition reaction mechanism of thioglycolic acid to fluorenylidene chalcone was proposed. These compounds may be used as the starting materials for the preparation of the engineering plastics or the germicide.