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한국어 고급 학습자를 위한 조사 ‘을/를’의 의미적 기능 교육 방안 연구 - 강조로서의 ‘을/를’을 중심으로 -
김하림 ( Kim Halim ) 한성대학교 한성어문학회 2019 漢城語文學 Vol.40 No.-
조사는 한국어가 가지는 특징 중 하나이다. 그렇기에 한국어 학습자가 한국어를 한국인처럼 잘 구사하기 위해선 조사에 대한 이해가 반드시 필요하다. 이 조사에 대한 교수·학습은 보통 초급의 학습자들을 대상으로 이루어지나 조사가 가지는 의미를 정확하게 이해하기 위해서는 고급의 학습자들을 대상으로도 교수·학습이 이루어져야 한다. 이 연구는 한국어 조사 ‘을/를’이 가지는 의미적 기능을 교육하는 방안을 마련하는데 목적이 있다. 선행연구들을 통해 조사 ‘을/를’이 가지는 통사적 기능과 의미적 기능에 대해서 살펴보고 새롭게 정리하였다. 그리고 한국어 교재와 문법서들을 검토함으로써 한국어교육 현장에서 조사 ‘을/를’의 교육 현황에 대해 살펴봤다. 그 결과 한국어교육 현장에서 조사 ‘을/를’의 통사적 기능에 대한 교수·학습은 이뤄지고 있으나 의미적 기능에 대한 교수·학습은 제대로 이뤄지지 않고 있음을 확인하였다. 이에 이 연구에서는 담화 문법 관점 차원에서의 조사 교수·학습 방안을 바탕으로 고급학습자를 대상으로 한 조사 ‘을/를’의 의미적 기능의 교육 방안을 제시하였다. A ‘postposition’ is one of the features in the Korean language. The understanding of the postposition is essential for Korean learners to speak Korean fluently as Korean people. The teaching and learning about the postposition must be taught not only to basic-level learners, but also to advanced-level learners to understand accurately the meaning of the postposition. This research is aiming to arrange the ways to educate the semantic functions in Korean postposition, ‘을/를’(objective postposition). It contains the research of the semantic and syntactic functions in it and arranges them newly through the precedent studies. Also, it surveyed the circumstances of the education about the postposition in the Korean education fields by reviewing Korean textbooks and Korean grammar books. As a result, this research found out that the teaching and learning about the syntactic functions are being conducted, but those about the semantic functions are not being conducted well. Therefore, it suggests the methods to educate the semantic functions in Korean postposition, ‘을/를’(objective postposition) based upon the way of teaching and learning about it in terms of the discourse grammar.
Pseudocapacitive Characteristics of Low-Carbon Silicon Oxycarbide for Lithium-Ion Capacitors
Halim, Martin,Liu, Guicheng,Ardhi, Ryanda Enggar Anugrah,Hudaya, Chairul,Wijaya, Ongky,Lee, Sang-Hyup,Kim, A-Young,Lee, Joong Kee American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.24
<P>Lithium-ion capacitors (LICs) and lithium-ion batteries (LIBs) are important energy storage devices. As a material with good mechanical, thermal, and chemical properties, low-carbon silicon oxycarbide (LC-SiOC), a kind of silicone oil-derived SiOC, is of interest as an anode material, and we have examined the electrochemical behavior of LC-SiOC in LIB and LIC devices. We found that the lithium storage mechanism in LC-SiOC, prepared by pyrolysis of phenyl-rich silicon oil, depends on an oxygen-driven rather than a carbon-driven mechanism within our experimental scope. An investigation of the electrochemical performance of LC-SiOC in half- and full-cell LIBs revealed that LC-SiOC might not be suitable for full-cell LIBs because it has a lower capacity (238 mAh g(-1)) than that of graphite (290 mAh g(-1)) in a cutoff voltage range of 0-1 V versus Li/Li+, as well as a substantial irreversible capacity. Surprisingly, LC-SiOC acts as a pseudocapacitive material when it is tested in a half-cell configuration within a narrow cutoff voltage range of 0-1 V versus Li/Li+. Further investigation of a 'hybrid' supercapacitor, also known as an LIC, in which LC-SiOC is coupled with an activated carbon electrode, demonstrated that a power density of 156 000 W kg(-1) could be achieved while maintaining an energy density of 25 Wh kg(-1). In addition, the resulting capacitor had an excellent cycle life, holding similar to 90% of its energy density even after 75 000 cycles. Thus, LC-SiOC is a promising active material for LICs in applications such as heavy-duty electric vehicles.</P>
Halim, Martin,Hudaya, Chairul,Kim, A-Young,Lee, Joong Kee The Royal Society of Chemistry 2016 Journal of Materials Chemistry A Vol.4 No.7
<▼1><P>Silicon oxycarbide (SiOC) is gaining increasing attention as a promising anode material for lithium ion batteries due to its higher reversible capacity compared to incumbent graphite.</P></▼1><▼2><P>Silicon oxycarbide (SiOC) is gaining increasing attention as a promising anode material for lithium ion batteries due to its higher reversible capacity compared to incumbent graphite. The kinetic processes at a SiOC anode result in rapid capacity fading even at a relatively low current density, thereby hindering its commercialization. Herein, a distinctive, phenyl-rich silicone oil is used as a precursor for producing SiOC anode materials <I>via</I> simple pyrolysis. We find that only silicone oil with phenyl-rich rings can be converted into SiOC materials. The phenyl group was crucial for carbon incorporation to allow Si–O–C bonding and the formation of a free-carbon phase. The resulting SiOC anode exhibited stable cyclability up to 250 cycles, with a discharge capacity of 800 mA h g<SUP>−1</SUP> at a current density of 200 mA g<SUP>−1</SUP>. The remarkable cycle performance of SiOC was correlated with its low dimensional expansion (7%) during lithiation, which maintains its structure over cycling. Rate capability tests showed a highly stable performance with a maximum discharge capacity of 852 mA h g<SUP>−1</SUP> at a current density of 100 mA g<SUP>−1</SUP>. When the discharge current density was increased 64-fold, the reversible capacity of the SiOC anode was 90% of its maximum capacity, 772 mA h g<SUP>−1</SUP>. The excellent electrochemical performance of SiOC could be attributed to the rapid mobility of Li<SUP>+</SUP> within the SiOC matrix, as indicated by a Li<SUP>+</SUP> diffusion coefficient of 5.1 × 10<SUP>−6</SUP> cm<SUP>2</SUP> s<SUP>−1</SUP>.</P></▼2>