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이재성,이재성,김보미,Leda Mirbahai,Angela Mally,J. Kevin Chipman 한국유전학회 2016 Genes & Genomics Vol.38 No.1
DNA methyltransferases (DNMTs) are an enzyme family that catalyzes the transfer of a methyl group to DNA for a wide variety of biological functions. To determine whether the number and composition of the Dnmt gene family affects the 5-methylcytosine (5mc) ratio at the genome level, genome-wide 5mc ratios from three marine animals, the mangrove killifish (Kryptolebias marmoratus), an intertidal copepod (Tigriopus japonicus), and a monogonont rotifer (Brachionus koreanus), were analyzed in each organism after the cloning of Dnmt genes. Lineage- and teleost-specific gene evolution was observed in the vertebrate Dnmt3 gene family, while unique gene expansion was found in the T. japonicus Dnmt1 gene family. However, the rotifer did not have any apparent homologue of Dnmt1 or Dnmt3 in its genome. This gene information was highly supportive of genome-wide 5mc levels in the three marine animals. Therefore, the absence or presence of the Dnmt gene family could be an important evolutionary parameter of how this could affect genomewide epigenetic metabolism.
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미량의 코발트 첨가가 W-Cu 전기 접점재의 성질에 미치는 영향
이재성,문인형 대한금속재료학회(대한금속학회) 1977 대한금속·재료학회지 Vol.15 No.2
高負荷能을 갖는 W-Cu系 전기 접점재의 미량의 Co를 첨가함으로서 얻어지는 諸使用特性의 變化를 單純W-Cu系와 또 미량의 Ni을 첨가한 경우와 對比 조사하였다. W-Cu-Co (tr.)系는 W-Cu-Ni (tr.)系나 W-Cu系에 比하여 旣發表한 바와 같은^(1)) 燒結 및 溶侵時에 보여주는 有利한 製造上의 特性이외에도 그 전기적특성에 있어서도 뚜렷한 개선을 보여주었다. W-Cu-Co(tr.) 系는 同一한 使用條件아래에서 W-Cu나 W-Cu-Ni (tr.)系에 比하여서 보다 낮은 接觸抵抗과 contact erosion 율을 보였다. 이와 같은 낮은 contact resistance나 contact erosion 현상은 W-Cu-Co 系에서도 W-Ag-Co에서와 같이^(2,3)) Co_7W_6 金屬間化合物이 W粒子주변에 형성되어 접점저항의 증가를 가져오는 복잡 산화물의 형성을 저지하기 때문이라 생각된다. ※^(1)) 李載星, 文仁炯 : 大韓金屬學會, 1976年度秋季學術發表會서 "미량의 코발트 첨가가 W-Cu 전기 접점재의 수축거동에 미치는 영향"발표(同學會誌 14권 4호의 초록 발표) ※^(2)) Kabryamc, et al: PMI 5 (1973) 122 (3) I.H. Moon and W.J. Huppmann: PMI 6 (1974) 190.
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이재성,한스-우베 담스,최범순,이재성,최익영 한국유전학회 2012 Genes & Genomics Vol.34 No.4
Microcystins are cyanobacterial hepatotoxins, and are produced by nonribosomal enzyme complexes, mcy gene cluster. In this study, we report on whole mcy gene clusters from two Korean strains of M. aeruginosa that were blooming in Lake Paldang (FCY-26) and Geum river (FCY-28). Their specific gene locus, amino acid information, and sub-cluster orientation were also characterized in both strains. Both gene clusters are of 55 kb, and also each length, number and the arrangement are identical. Their sequence analysis revealed a cluster of 10genes (mcyA, B, C, D, E, F, G, H, I, and J) involved in the biosynthesis of microcystin, and mcyABC and mcyDEFGHIJ formed two polycistronic operon structures that are transcribed bidirectionally from a central promoter region between mcyA and mcyD. The analysis of SNPs provided different nucleotide composition and amino acid variations in two Korean strains of M. aeruginosa. This approach is useful to develop genetic indicators identifying toxic cyanobacteria and their cyanotoxins,and helpful for a better understanding of the diversities of mcy gene clusters, the biosynthesis of microcystin, and the mediation of environmental parameters causing algal blooming and HABs.
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냉간가공이 4.5 % Cu-Aluminum 합금의 시효경화에 미치는 영향
이재성,문인형 대한금속재료학회(대한금속학회) 1976 대한금속·재료학회지 Vol.14 No.1
대부분의 wrought Al-合金에서 抽出 및 燒入處理後에 引拔이나 直線調整 등의 加工이 따른다. 이들 加工은 時效硬化를 가져오는 中間相의 析出機構에 큰 영향을 미친다. 代表的인 시효합금의 하나인 4.5% Cu-Al 合金에서 여러 다른 加工度에 따른 時效현상을 살펴 봄으로써 加工작업이 석출경화에 미치는 영향을 조사하였다. 가공도가 0. 5. 10. 15 및 20%가 되게 冷間加工한 試片을 130. 150. 190. 220 및 250℃에서 각각 시효시켜 경도의 변화를 측정하였다. 어느 시효온도에 있어서나, 시효곡선이 보여주는 최대 경도값은 加工度가 커질수록 早期에 나타났으며, 또 동일한 시효온도에 있어서는 시효 前 加工度의 크기에 관계없이 최고의 硬度値가 비슷함을 보여 주었다. 실험에서 얻은 data로서 冷間加工時에 生成되는 結晶 결함과 中間相의 析出機構와의 가능한 범위의 관계를 논하였다.
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이재성,김윤순 한국일본학회 2013 日本學報 Vol.95 No.-
李良枝の『由煕』は、在日同胞女性の由熙が韓国に留学し、自分のアイデンティティーを求めてもがく姿を韓国人女性オンニの視点から描いた小説であるが、本稿では、由煕がアジュモニに日本語を教えることを拒否したことに注目して、彼女にとっての日本語とは何であったかについて考察し、作者の李良枝が、在日同胞が母国に対して持つ一種の優越感にまで切り込んだ点に注目した。母国に憧れ、一歩でも近づこうと努力する一方で、母国に優越感や不満を感じてしまう在日同胞の内面の矛盾と葛藤は、単に李良枝個人に限るものではないということを、李良枝は確信していたという。李良枝は、由煕が体験した危機と挫折を冷静に観察し、分析することにより、それらの問題を乗り越えようとした。また、李良枝は、本国生まれの人物であるオンニの目で在日同胞の姿を描くことに挑戦したが、本国人の気持ちや立場を多少なりとも理解できるようになったことにより、自分自身を客観化することができたことは、李良枝にとっては小説技法上の問題を越えた重要な分岐点、転換点を意味していた。李良枝は『由熙』の主題を、あらゆる立場の人々に共通の人間の実存の問題にまで普遍化しようとしたと言うが、困難に遭遇してもそれを正面から見つめて乗り越えていこうとする彼女の姿は、まさにあらゆる人間にとって生きていく上で必要な共通の姿勢なのかもしれない。小説『由煕』は、在日同胞である李良枝が手探りでその生き方を模索した軌跡であり、また理想と現実の間でその乖離を克服していこうとするひとりの人間としての苦悩の軌跡である。
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다자이 오사무 『人間失格』의 主人公 캐릭터에 관한 考察
李在聖 중앙대학교 일본연구소 2015 日本 硏究 Vol.0 No.38
“No Longer Human” is one of the representative works of Osamu Dazai. This paper is a review about the format, structure, narrative, and hero’s character of “No Longer Human”. The format of this novel is composed by five part such as preface, first memorandum, second memorandum, third memorandum, and postface. Preface and postface among these, it describes the main character Yozoh as the third person. By targeting the main character Yozoh to describe the third-person narrative, the author made Yozoh’s memorandum to be seen rather than to demonstrate to the general reader. By doing so, it made Yozoh’s memorandum, not a flimsy confession to demonstrate to the general reader, and made to look as honest confession of a man decides to commit suicide. With such effect of the preface and postface, readers will feel the thrill of sneaking and spying illusion without the permission of the secret private confession. The sentiment reads like a secret diary the sneak peek accomplice would be to place a comer of the mind of the reader. This novel is a fiction that is extremely close to the actual life of the author of Osamu Dazai. By the secret and not secret that the main character and author overlap, readers may compare that appears is what is reflected in variations in the actual circumstances of the case or reading novels, like solving puzzles, and can feel the fun. It is causing a lot of empathy and compassion called the most impressive and appealing characters that Yozoh effectively, and the development of the story right over his clown doing.
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