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김기엽 한국전기전자재료학회 1992 電氣電子材料學會誌 Vol.5 No.2
무독성 혼합안정제인 Zn/Ca-stearate의 방사선 안정화 효과를 증진시키기 위해서 안정화 조제로 알코올들을 PVC에 배합하여 방사선 조사하였을 때 PVC의 색차변화를 측정하여 이들 안정화 조제의 방사선 안정화 효과를 비교 검토하였다. 2가알코올에 의한 PVC 안정화 효과는 2가알코올의 주쇄길이에 비례하여 나타나고 있으나 sorbitol을 제외한 다가알코올에 의한 PVC 안정화 효과는 거의 없는 것으로 나타났다. 이들 알코올에 의한 PVC의 방사선 안정화는 2가알코올이 PVC에서 발생된 고분자 라디칼에 대한 라디칼 포착제로서 작용하기 때문인 것으로 판단된다.
Acrylonitrile Butadiene Rubber의 열적 열화 특성
김기엽,강현구,이청,류부형 한국안전학회 2003 한국안전학회지 Vol.18 No.4
Thermal degradation of Acrylonitrile butadiene rubber(NBR), which is used for 0-ring material as elastomeric sealed diaphragm valve in the nuclear power plants, is examined. The thermal degradation is accelerated at l30℃ by Arrhenius exploit method using the activation energy calculated by thennogravimetric analysis. The weight loss temperature and glass transition temperature are verified for thermally aged NBR The relationship between dynamic mechanical properties and elongation at break are also investigated. The threshold value of thermally aged NBR is a ten year in the change of elongation at break.
18세기 朝鮮과 日本에서 편집한 李滉 書札 選集에 대한 一考察 -[退溪先生書節要]와 [李退溪書抄]를 中心으로-
김기엽 한국학중앙연구원 한국학중앙연구원 2019 장서각 Vol.0 No.42
Leetoegye seocho (李退溪書抄) by Suguri Kyokusui and Toegye Seonsaeng Seojeolyo (退溪先生書節要) by Lee Sang-Jeong are the letter collections written by Lee Hwang edited in 18th century. Leejaseojeolyo (李子書節要) by Jeong Hon was compiled before that time and Tweoseoyujib (退書類輯) by Kim Deok-Ryeon and Tweoseobaekseon (退書百選) by Lee Jeong-Ro was after that time. Now, we are especially examining Japan’s Leetoegye seocho and Korea’s Toegye Seonsaeng Seojeolyo which showed some similarities in the postscript of Toegye Seonsaeng Seojeolyo in 18th century. Both Toegye Seonsaeng Seojeolyo and Leetoegye seocho followed the sequence of letters which were part of Toegyejib (退溪集). Furthermore, they had similar structures overall because they imitated the editing skill of Jujaseojeolyo (朱子書節要) by Lee Hwang. However, details varied such as the recipients, whether the preface existed or not, the way to present the table of contents and how to annotate. Toegye Seonsaeng Seojeolyo put in more characters than Leetoegye seocho that dealt with fewer figures but carried more letters. Leetoegye seocho went into detail of “Chronology (年譜)” and “Behavior (行實)” of Lee Hwang’s life and the list of recipients and the number of letters were put in every volume. The preface by Goga Seiri and the postscript by Okada Kansen were put in, too. Yet, Leetoegye seocho omitted the preface and revealed recipients’ nicknames, pen names, hometowns, and the relationship with Toegyeo on the list of Jeja (諸子). Toegye Seonsaeng Seojeolyo edited by Lee Sang-Jeong was published with being attached the postscripts by Jeong Jong-Ro and Kim Goeng who followed Lee Sang-Joeng. Through their postscripts, Kim Jong-Deok who was one of Lee Sang-Jeong’s disciple participated in editing and his grandchild, Lee Byeong- Woon led the publication. Lee Byeong-Woon spoke in the postscribe that Leetoegye seocho complied by Suguri Kyokusui came to Joseon Dynasty through dispatching envoy. Moreover, he told that Toegye Seonsaeng Seojeolyo wasn’t influenced directly by it in the process of complication. The letter from Lee Sang-Jeong didn’t put in Toegye Seonsaeng Seojeolyo collected by the National Museum of Korea. Instead, Lee Sang-Jeong’s letter was put that contained the details of editing and the standard of selection at the end of Toegye Seojeolyo (退溪書節要) (Toegye Seonsaeng Seojeolyo), Volume X included in Daesan Jeonseo (大山全書). Toegye Seojeolyo in Daesan Jeonseo seemed a manuscript before printing a block book. 이 연구에서 다룰 이황의 서찰 또한 후대의 여러 학자가 선집하였는데, 조선뿐만 아니라 일본 내에서도 자체 간행된 선집본이 유통되었다는 사실이 눈길을 모은다. 이황의 서찰 선집은 鄭焜(1602~1656)이 편집한 『李子書節要』, 일본의 村士玉水(1729~1776)가 편집하고 그의 제자 岡田寒泉(1740~1816)이 주도하여 간행한 『李退溪書抄』, 李象靖(1711~1781)이 편집한 후 이상정의 손자 李秉運(1766~1841)이 주도하여 간행한 『退溪先生書節要』, 구한말 金悳鍊(1869~1929)의 『退書類輯』와 李庭魯의 『退書百選』 등이 있다. 앞서 알려진 5종의 이황 서찰 선집 중에 『李退溪書抄』는 『退溪先生書節要』의 간행자 李秉運이 쓴 跋文에 직접 언급되어 있는데, 『李退溪書抄』와 『退溪先生書節要』가 비슷한 시기에 간행되었던 사실은 두 선집의 영향 관계와 편집 경위에 대해 주목하게 만든다. 기존 조ㆍ일 양국의 학술 교류나 접점에 대한 연구는 17세기 일본 초기 성리학과 조선 유학의 관계, 혹은 사행록ㆍ창화록의 기록을 중심으로 진행되어 왔다. 여기서는 18세기 이후의 이황을 접점으로 하는 학술적 성과를 살핌으로써 양국의 서적 교류 및 주자학과 이황에 대한 인식에 대해 알아보려 한다. 이에 일본에서 간행된 『李退溪書抄』와 조선에서 간행된 『退溪先生書節要』의 體制를 비교ㆍ대조하고, 조선과 일본에서 書節要와 書抄가 편집된 경위를 살피고자 한다.
^(60)Co γ-선 조사에 따른 클로로프렌 고무의 열적 특성
김기엽,이청,류부형 한국안전학회 2003 한국안전학회지 Vol.18 No.4
The thermal properties of chloroprene rubber (CR) with ^(60)Co γ-ray irradiation has been investigated. The prepared CR was irradiated up to 1000kGy radiation dose by Co^(60) γ-ray and the radiation degradation of CR was investigated by thermogravimetric analysis and differential scanning calorimetry. Dynamic mechanical properties measurement and FT-1R observation are carried out as well. From these analyses results, the glass transition temperature(T_(g)), decomposition onset temperature(DOT), oxidative induction time(OIT), the peak temperature of loss modulus and mechanical tan δ values were compared for the radiation degradation level of CR. The tendency between T_(g) and peak temperature of loss modulus and mechanical tan a agreed well with radiation doses. Decomposition temperature, OIT and DOT showed the same tendencies as increasing radiation doses. It was verified that these analyses are available to estimate the degradation level of CR