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Li-ion battery anodes from ginkgo leaf-derived nanoporous carbons rich in redox-active heteroatoms
Na Rae Kim, Hong Joo An, Young Soo Yun, Hyoung-Joon Jin 한국탄소학회 Carbon Letters 5 Pages
한국탄소학회 Carbon Letters 2017, Vol.22 13 110-114 (5 pages)
Lithium-ion batteries (LIBs) have attracted increasing attention as a sustainable power source due to the rapid growth in mobile electronics and electric automobile markets, driven by increasing environmental awareness [1-4]. The electrochemical performance of LIBs is strongly dependent on the active electrode materials. Therefore, their continuing advanced development is of key importance to meet the expectations of the market [5-7]. Graphite, commonly used in LIB anodes, forms binary graphite... -
Study of complex electrodeposited thin film with multi-layer graphene-coated metal nanoparticles
Young-Lae Cho, Jung-woo Lee, Chan Park, Young-il Song, Su-Jeong Suh 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2017, Vol.21 8 68-73 (6 pages)
We have demonstrated the production of thin films containing multilayer graphene-coated copper nanoparticles (MGCNs) by a commercial electrodeposition method. The MGCNs were produced by electrical wire explosion, an easily applied technique for creating hybrid metal nanoparticles. The nanoparticles had average diameters of 10?120 nm and quasispherical morphologies. We made a complex-electrodeposited copper thin film (CETF) with a thickness of 4.8 μm by adding 300 ppm MGCNs to the electrolyte... -
Microwave heating of carbon-based solid materials
Teawon Kim, Jaegeun Lee, Kun Hong Lee 한국탄소학회 Carbon Letters 10 Pages
한국탄소학회 Carbon Letters 2014, Vol.15 No.1 2 15-24 (10 pages)
As a part of the electromagnetic spectrum, microwaves heat materials fast and efficiently via direct energy transfer, while conventional heating methods rely on conduction and convection. To date, the use of microwave heating in the research of carbon-based materials has been mainly limited to liquid solutions. However, more rapid and efficient heating is possible in electron-rich solid materials, because the target materials absorb the energy of microwaves effectively and exclusively.... -
The Effects of Consciousness-raising Tasks on EFL Learners Grammar Acquisition and Flow
Ma Jee Hyun, Cho Young Ah 이화여자대학교 교과교육연구소 교과교육학연구 10 Pages
이화여자대학교 교과교육연구소 교과교육학연구 2019, 제 23권 1호 2 16-25 (10 pages)
The current study examines the effects of consciousness-raising tasks on L2 learners grammar competence and their flow experiences. The participants consisted of 77 Korean college students who were assigned to two consciousness-raising task groups the hypothesis building/checking and classification and one control group. The study used a background questionnaire, pre-, post-, and delayed English grammar tests, and also pre-, and post-flow perceptions questionnaires. The results indicate that... -
Lexical Verb Forms in L1 and L2 Spoken English:A Corpus-Based Analysis
Sung Min-Chang 경인교육대학교 교육연구원 교육논총 14 Pages
경인교육대학교 교육연구원 교육논총 제 42권 특별호 5 53-66 (14 pages)
The present study investigates Korean learners’ use of English lexical verb forms and identifies learner deviations from native usage patterns. It examines the frequencies of six verb forms (i.e., base, present, third-person singular, past, gerund, and past participle) in a native and a learner corpus of argumentative speeches. The study reveals that certain verb forms are overor underused by Korean learners of L2 English, compared to native speakers of English. It is also found that L2 overuse... -
인체 갑상세포의 대사조절에 의한 프로 유로카이나제의 생산
강재구, 최석규, 이현용 한국미생물생명공학회 산업미생물학회지 5 Pages
한국미생물생명공학회 산업미생물학회지 1990, Vol.18 No.4 401-405 (5 pages)
포함한 DMEM 배지에 갑상세포주 579를 연속배양하여 약 $5.7 imes 10^{-8}$g/h /cell에 해당하는 pro-UK의 비생산속도를 얻을 수 있었다. 또한 배지의 이동속도가 증가할 수록 glutamine의 소비속도가 증가하는 반면 ammonia 생산속도는 일정하게 유지되는, glutamine의 완전동화에의한 물질생산증가 현상을 나타냈다. 5mM의 glucose와 2mM의 glutamine, 포화용존 공기의 10에 해당하는 용존산소 및 pH 6.2의 maintenance 생육 조건하에서 약 15일간 유지시켜, $12 imes 10^{-8}$g of pro-UK/h/cell의 최대 비생산속도와 0.226mg/g of...
