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황색종 연초 건조중 탈수경과 및 풍속차가 건조엽의 특성에 미치는 영향
유명현,석영선,이운철,Ryu, Myong-Hyun,Seok, Yeong-Seon,Lee, Un-Chul 한국연초학회 1983 한국연초학회지 Vol.5 No.2
The effect of leaf dehydration process and air flow capacity of bulk curing on physical properties and composition of cured leaves was studied, respectively, during flue- curing. Cured leaves from excessive moisture during yellowing stage and those from rapid dehydration Process inevitably during later stages, tend towards lower equilibrium moisture contents, higher shatter index, hither protein nitrogen, and leaf scalding or deterioration of Beaves with redish cast. Early dehydration at the yellowing stage re suited in increasing of p Bamitic, stearic, linoleic, and linolenic acid contents, but showed reduction of brightness difference between upper and lower surface of the cured leaves, Leaf surface lipid decreased with the progress of curing stages, more conspicuously during later stage. Lowering air flow capacity of fan by 50oye during stem drying stage resulted in increasing of leaf surface lipid and 25oye decreasing of electric power consumption , but curing period and kerosene consumption were not affected.
토픽모델링을 활용한 사회문제 해결방안 모색 연구: 사회양극화와 다중격차의 관점에서
유명현,임세민,오서경,송지훈 한국디지털콘텐츠학회 2023 한국디지털콘텐츠학회논문지 Vol.24 No.8
This study aimed to extract major social problems recently discussed through social polarization and multiple disparities and interpret the related phenomena. Specifically, social media articles from three major daily newspapers were collected and 20 major topics were identified using Latent Dirichlet Allocation (LDA) as a method for topic modeling and interpretation. In addition, the tendency of topics was predicted by confirming changes in topics over time. Finally, the implications and research limitations are discussed. 본 연구에서는 사회양극화 및 다중격차의 개념을 통해 최근 주요하게 논의되는 사회문제들을 도출하고 관련 현상을 해석하고자 한다. 이를 위해 주요 3개 일간지의 사회면 기사를 수집하고 토픽모델링 방법으로 LDA(Latent Dirichlet Allocation)을 사용하여 20개의 주요 토픽을 도출하였으며 사회양극화와 다중격차의 관점에서 해석하였다. 또한 시간적 흐름에 따른 세부 토픽별 변화를 확인하여 주요 논의 분야의 경향성을 예측하였다. 마지막으로 시사점과 향후 연구를 위한 제언을 기술하였다.
고신뢰성 리튬 메탈 이차전지 구현을 위한 리튬 메탈 음극 기술
유명현,이용민 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Lithium (Li) metal has received much attention for a long time as a promising anode material on account of its low potential (-3.04 V vs. SHE) and specific capacity (~3800 mAh g<sup>-1</sup>). Despite these promising aspects, Li metal anodes have never been completely implemented in industrial applications for more than four decades because of the uncontrolled Li dendrite growth. The Li dendrite growth is very fatal for the cycle life and cell safety. Recently, with the emergence of post-Li-ion batteries, safe and efficient operation of Li metal anodes has again become an breakthrough technology for the next generation energy storage systems with high energy density including Li-sulfur and Li-air. In the presentation, extensive efforts devoted to control Li dendrite growth thus far including solid polymer electrolytes, separators, electrolyte functional additives, morphological changes of Li metal have been reviewed.
Surface Treatment Approaches to Improve Cycle Performance for Micro-patterned Li metal
유명현 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Lithium (Li) metal has been considered as a promising anode material for next-generation Li secondary batteries for over five decades. Nevertheless, due to uncontrolled Li formation, so called Li dendrite, Li metal has been hindered for the successful implementation in a practical battery system. Recenltly, we demonstrated the effect of mechanical surface modification on the performance of Li metal foil electrodes in a systematic manner. Unfortunately, however, the surface-patterned Li metal still suffers from uncontrolled Li formation at high-current operating conditions. This consumes excess amounts of electrolytes during repeated cyclings, which severely degrade the cycle performance of surface-patterned Li metal. To improve this, we introduce surface treatment techniques such as protection layers and functional electrolyte additives for surface-patterned Li metal. Uncontrolled Li plating has been significantly inhibited, resulting in superior cycle performance improvement.