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柳浩錫 전북사학회 2013 전북사학 Vol.0 No.43
This is to analyze the Jeonju saengwon and jinsa roster published in 1931 which belongs to Namanje, an old famous auditorium, in Jeonju. I will place the focus on the background and the distinguishing features of the publishment, and the authenticity of all the 631 members on the roster. For the verification, the CD-ROM Samabangmok made by Seoul System was used. The outcome is as follows. The roster was issued on the basis of the roster in manuscript of the Jeonju Hyanggyo, a local school annexed to the confucian shrine. The compilation staff consisted of 55 members, but they didn’t try to verify the authenticity of the manuscript, but rather made every effort to find the ancestors or descendents of the saengwon and the jinsa of the manuscript and to write these facts on the new book. And the analysis of the staff shows that 18 among the staff were the descendants of the sangwon and the jinsa on the roster, and 4 were saengwon or jinsa themselves. On the other hand, 212 saengwon and jinsa, 33% of the roster’s total, were not found in any of the existing samabangmoks of the Joseon dynasty. It means that most of them could be fakes. Among them there were 48 clans including influential clans such as Jeonju Yu, Joyang Im, Jeonju Choi, Milyang Park, Jeonju Lee, and Kimhae Kim. Many fakes were recorded to pass the exam in the early or middle Jeoson dynasty. Some of them became successful candidates even in the year when any exam was not conducted. At the times when the roster was published, Korea was suffering a cruel fate. Japan was about to eradicate Korean national identity under the slogan “Japan and Korea are One Entity.” Almost 40 years passed since the civil service examination system had been abolished, and 20 years passed since Japan had made Korea its colony. It was at this moment that Jeonju literatis determined to publish the old roster. To them the examination system had never ceased to exist. In short, they were still living in the country of the examination.
보통포틀랜드시멘트의 수화 반응에 미치는 폴리카복실레이트계 고유동화제의 영향
류호석,송종택 한국세라믹학회 2004 한국세라믹학회지 Vol.41 No.5
Polycarboxylate type superplasticizers (PCA) with different graft chain (Polyethylene oxide) length were synthesized by Methoxypoly (ethyleneglycol)monomethacrylate (MPEGMAA) and methacrylic acid (MAA). The effects of PCA on the hydration of Ordinary Portland Cement (OPC) were investigated by Fourier Transform Infrared Spectroscopy (FT-IR), X-Ray Diffraction (XRD) and Differential Scanning Calorimetry (DSC) techniques. The effect of graft chain length of PCA on the hydration of OPC was different at early age, but, at long age, was similar. The ratio of relative peak intensity, (I[001]/I[101]), of Ca(OH)$_2$ compared with OPC also was reduced by PCA addition. 메톡시폴리에틸렌글리콜모노메타크릴레이트(MPEGMAA)와 메타크릴산(MAA)을 공중합시킨 폴리카복실레이트계 고유동화제(PCA)의 그라프트 사슬인 폴리에틸렌옥사이드(PEO)의 길이가 다를 경우, 보통포틀랜드시멘트(OPC)의 수화 반응에 미치는 영향을 Fourier Transform Infrared Spectroscopy(FT-IR), X-Ray Diffraction(XRD)과 Differential Scanning Calorimetry (DSC)를 이용하여 조사하였다. PCA의 그라프트 사슬의 길이에 따라 초기 재령에서 수화 반응에 미치는 영향은 달라지나, 장기 재령에서는 큰 차이가 없었다. 또한 PCA가 첨가된 경우의 Ca(OH)$_2$의 상대 피크 강도의 비(I[001]/I[101])는 OPC에 비해 감소하였다.
리튬 유황 전지용 PVdF 겔 고분자 전해질의 가소제에 따른 전기화학적 특성 평가
류호석,김종선,김동주,김동연,김익표,안효준,김기원,안주현,이건환,Ryu, Ho-Suk,Kim, Jong-Seon,Kim, Dong-Ju,Kim, Dong-Yeon,Kim, Ic-Pyo,Ahn, Hyo-Jun,Kim, Ki-Won,Ahn, Jou-Hyeon,Lee, Gun-Hwan 한국전기화학회 2007 한국전기화학회지 Vol.10 No.3
리튬/유황 전지에 적합한 전해질을 조사하기 위하여, 여러 종류의 글라임(glyme)계 가소제를 넣은 폴리비닐리덴플로라이드(poly(vinylidene fluoride):PVdF) 겔 고분자 전해질을 제조하여 전기화학적 특성을 실험하였다. 가소제는 에틸렌옥사이드(ethylene oxide; EO) 구조를 가지는 glyme계 유기용매 중에서, EO의 체인 길이가 다른 트리글라임(triglyme), 테트라글라임(tetraglyme), 폴리글라임(polyglyme (Mn=250, 500))의 네 종류를 사용하였다. 가소제 내의 EO의 체인 길이가 길어질수록 PVdF 겔 고분자 전해질의 이온전도도는 감소하였다. PVdF 겔 고분자 전해질의 가소제로 triglyme을 사용한 경우의 이온전도도가 $5.38{\times}10^{-4}\;S/cm$로 가장 높았으며, polyglyme(Mn=500)를 사용한 경우에는 $2.80{\times}10^{-4}\;S/cm$으로 가장 낮았다. 그러나 계면저항은 tetraglyme을 사용한 경우에 가장 낮게 나타났으며, 이 전해질을 리튬/유황 전지에 적용하였을 때 1232 mAh/g-S(이론용량의 70%)의 높은 초기 방전 용량을 나타내었다. In order to find out proper PVdF gel polymer electrolyte for Li/S battery, we investigated PVdF gel polymer electrolytes with various glyme type plasticizer such as polyglyme, tetraglyme, triglyme. The organic solvents as triglyme, tetraglyme, polyglyme (Mn = 250, 500) has different chain length of ethylene oxide(EO) in solvent of glyme system. ionic conductivity decreased as increasing chain length of EO in plasticizers. Ionic conductivity of PVdF gel electrolyte with tetraglyme, triglyme, polyglyme (Mn = 250, 500) at room temperature was $5{\times}10^{-4},\;3{\times}10^{-4},\;6{\times}10^{-5},\;3{\times}10^{-5}\;S/cm$, respectively. Li/S cell with PVdF gel polymer electrolyte using tetraglyme plasticizer had low interfacial resistance and the highest initial discharge capacity of 1232 mAh/g of active sulfur, which was about 70% utilization of theoretical value.