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A Controlled Growth of ZnO Nanostructures on ZnS
안성일 한국전기전자재료학회 2018 Transactions on Electrical and Electronic Material Vol.19 No.3
ZnO nanostructures were developed on a microsphere of ZnS:Cu,Cl phosphor (ZC) for a potential application to a new lightsource. The growth mechanisms of these nano-structures are very diff erent from those of previously reported methods dueto the diff erence in the zinc ion source of ZnO on the micro-sphere ZC. In this report, ZnO plays two diff erent roles: provisionof a seed site and a zinc ion source during the swelling and hydrothermal reaction. In building nanostructures, nanowiresappeared nano-wires fi rst appeared and played a key role in the growth of seed sites of nano-fl owers. Additionally, asignifi cant luminance enhancement in the CL spectrum is observed from the emission of the fl owers/ZC apparently causedby secondary excitation due to the emission from ZnO nanofl owers.
Changing the sp2 Carbon Clusters in Graphene Oxide During Exfoliation
안성일 한국전기전자재료학회 2015 Transactions on Electrical and Electronic Material Vol.16 No.1
The change of the chemical structure of graphene oxide (GO) was investigated by periodical sampling of GO duringexfoliation by using a sonicator. A significant amount of GO was exfoliated during up to 10 hr of sonication. Ramanand Fourier transform infrared spectroscopy revealed a continuous increase of the G/D or C=C/C=O peak ratio ofGO, as the sonication time increases. The photoluminescence (PL) intensity of each GO sample also decreased asa function of the sonication time. PL excitation spectra with three major peaks indicate that the sizes of sp2 carbonclusters were enlarged by longer sonication. In addition, new excitation at around 300 nm proves the existence ofnewly developed small clusters of sp2 carbons as the sonication time increased.
안성재(Ahn Sung Jae)(安性栽) 대한중국학회 2016 중국학 Vol.57 No.-
修辭(수사)의 사전적 의미는 修辭가 文彩(문채: figure)의 분류 기준이 됨을 뜻하므로, 사실상 修辭의 범위를 문법학적으로 제한함을 뜻한다. 그런데 孔子(공자)는 修辭에 대해서 대단히 부정적인 태도를 취했고 나아가 언어적인 측면보다 실천의 측면을 더욱 강조했으므로, 사전적 의미로서의 修辭 개념에 전면적으로 대치된다고 볼 수 있다. 하지만 『左傳(좌전)』에서 공자는 오히려 말을 하지 않으면 그 뜻을 드러내지 못한다고 강조하며, 언어표현의 중요성을 부각시키고 있다. 修辭學(수사학)에 있어서 ‘修辭’는 “修辭立其誠(수사입기성)”이란 구절에 기인하고, 이는 “말을 닦음에 그 성실함을 세운다.”는 것이니, 이는 그간 인지되어온 修辭의 사전적 의미와는 상당한 괴리감이 있음을 의심하지 않을 수 없다. 이에 본 논문에서는 修辭의 어원과 그 의미 나아가 修辭가 활용된 空間(공간)의 유형에 대해서까지 섭렵하기로 한다. The rhetoric means the art of speaking or writing so as to persuade people effectively. This means that the rhetoric is the classification of a simple figure, actually the rhetoric is limited to the scope of grammar. By the way, Confucius pointed out luxuriant words interfere speaker clearly convey the meaning. Confucius stressed that people should not be arbitrarily spoke in particular, so we can understand he against rhetorical function indirectly. Therefore, Confucius not only appeared an attitude for against rhetoric, but also more prominent action, And this may account for completely confrontationthe between Oriental rhetoric and contemporary rhetoric concept. In spite of this, Confucius also pointed out don t speak, don t show it’s will. in the Zuo zhuan, this is even more highlights the importance of language expression. It is notorious that origin of the rhetoric can be traced back to a sentence “xiu ci li qi cheng(修辭立其誠)” in The I Ching, and we translate it to be careful to speak, just can be said to be honest. . And this truth let a person have to suspect that rhetorical meaning and modern rhetoric concept has certain gap. Therefore, this thesis first examine the source of the Oriental rhetoric and definition, and then investigate the rhetorical use of Oriental space.