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      • KCI등재

        Three-dimensional porous metal–nitrogen doped carbon nanostructure as a superior non-precious electrocatalyst in oxygen reduction reaction

        이설,이영우,곽다희,이진연,한상범,손정인,박경원 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.43 No.-

        We report the porous transition metal–nitrogen doped carbon nanostructures as cathode catalysts usinga well-stacked arrangement of template materials in the presence of polyvinylpyrrolidone as nitrogenand carbon sources and metal phthalocyanine as metal and nitrogen sources. The as-preparednanostructures show high specific surface areas (105.73–228.13 m2 g 1), porous structure, and dopedmetal and nitrogen species (pyridinic-N, pyrrolic-N, and graphitic-N) into carbon structures. In particular,the porous Fe–N-doped carbon nanostructure exhibits excellent ORR electrocatalytic properties inalkaline electrolyte; i.e., electron transfer number close to 4, high half-wave potential (0.81 V), improvedelectrochemical stability (a slight decrease of31 mV in the half-wave potential after the stability test),and methanol tolerance.

      • KCI등재

        中国和朝鲜经济交流加深趋势分析

        이설 한국동북아학회 2012 한국동북아논총 Vol.17 No.4

        On the basis of the analysis, it is recently confirmed that economic exchanges and cooperation between China and North Korea will be strengthened. It can be summarized in the following. First, North Korea's economic dependence on China may increase in the future. Particularly, after the United States, Japan, and Korea's sanctions against North Korea due to the North Korea’s policy failures like nuclear test, North Korea's economic dependence on China has been increasing even more. Second, One of the reasons for increase in North Korea’s reliance on China is due to its reduced economic exchanges with United States, Japan and South Korea. In other words, the triple alliance among South Korea, Japan and USA has imposed trade sanctions against North Korea, and North Korea has to no other choice except relying on China heavily. Therefore North Korea’s increasing reliance on China is not due to China’s unilateral economic exchanges and supports. When two Koreas exchanged and cooperated very actively in the past, North Korea was not as economically dependent on China as now. Third, some of China's increased exports such as energy and food to North Korea are not enough to cover shortages of North Korea that are caused by the reductions of foreign economic exchanges. Also, an amount of increase in the Chinese food export to North Korea is only part of the absolute needs in North Korea. The supply of oil and energy by China is found to be constant level for the long time. Thus China's economic supports and exchanges with North Korea is not enough to support lack of internal supply reductions in North Korea. Fourth, the regional cooperation in the border area along the Aprok(Yalu) and Tumen rivers between China and North Korea is being made in various aspects. China, along the border with North Korea, is equipped with infrastructure facilities like railways, highways, and bridges. North Korea also actively develops and implements policies to cope with the development of north east regions of China and to engage economic cooperation with China. It is analyzed that North Korea is actively responding to the Development plans of China’s north east province. 本文旨在回顾中国对朝鲜的交流程度,分析朝鲜对中国经济依赖的水平和具体原因。此外,本文将对日本,韩国和美国的经济制裁的效力,以及经济制裁是否是解决朝鲜解决核问题的妥当方法进行评析。根据研究可以概括为以下几点:首先,朝鲜和中国的经济交流可能会继续增加。特别是核试验后美国,日本和韩国对朝鲜的制裁使朝鲜经济对中国更加依赖。朝鲜也面临着韩美同盟,只要韩美同盟一直稳固,朝鲜和中国的经济交流就会变得更强。第二,朝鲜减少对外经济交流导致能源和食品短缺,但中国对其增加的出口量并不能完全填补这个缺口,其中食品的增加量只是朝鲜绝对需求的一部分。中国对其石油和能源的供应在很长一段时间维持在同一水平。因此,中国对朝鲜的经济支持并不足以满足朝鲜内部供应的短缺。第三,在沿鸭绿江边境地区,中朝在图们江区域合作方面取得了进展。在中朝边境,中国配备了基础设施,如铁路,高速公路,桥梁等。为了确保东北地区通往朝鲜东海岸港口运输路线的畅通,中方正在建设一批重要的项目。朝鲜也在积极地开发和实施政策,以应对东北地区的发展,与中国开展经济合作。据分析,朝鲜正在积极响应中国东北省份的发展计划。

      • KCI등재

        Frontier Orbitals of Fifteen C20H17(OH)3 Regioisomers: Hybrid DFT B3LYP Study

        이설,이지영,이기학 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.8

        The hybrid density-functional (B3LYP/6-31G(d,p)) method was used to analyze the substitution effect on the C20H20 cage based on calculation of the frontier orbitals of fifteen C20H17(OH)3 derivatives. All substitution products were geometrically optimized without constraints and confirmed by frequency analysis. The results suggest that the cis-1 cis-1 cis-2 regioisomer is the most stable isomer, which implies that hydrogen bonding exerts a stronger effect on the relative energies of the trihydroxide than long-range interactions. Thus, this supports the experimental result in which the bisvicinal tetrol was of particular preparative-synthetic interest. While the LUMO of each of the C20H17(OH)3 regioisomers was equivalently delocalized over the void within the cage, the HOMO was limitedly delocalized on substituents and carbons in close proximity to the substituents. The characteristics of the HOMO of each of the regioisomers vary based on the substitution sites. This indicates that the 15 regioisomers of each C20H20 trisubstituted derivative might undergo an entirely different set of characteristic chemical reactions with electrophilic reagents. The results further suggest that the penta-substituted OH groups on the surface of the fullerene cage are more likely to be localized on a pentagon than to be homogeneously delocalized.

      • KCI등재

        논문 : 중국어의 도상성에 대한 분석 -Research on the Iconicity of Chinese

        이설 중국어문학회 2014 中國語文學誌 Vol.49 No.-

        By investigation, this thesis thinks that the Iconicity of Chinese exists in all levels such as pronunciation, words and expressions, syntax and so on and analyzes its generative mechanism. The Iconicity of Chinese pronunciation lies in onomatopoeic word, Iconicity of pronunciation and meaning, and tone. First of all, the generation of onomatopoeic word has close relationship with things in the nature. Onomatopoeic word is vivid delineation of external world, shows the sound of nature world and human beings, and reflects the similarity between real world and symbols. Secondly, at the early stage of the generation of Chinese, the pronunciation and meaning of words come from things in the nature. They imitate all kinds of natural sounds and take the meanings of the sounds. The similarity of pronunciation and meaning specifically lies in using same or similar pronunciations to express things that have common characteristics. Finally, the tone of Chinese also shows pronunciation similarity. Tone can not only differentiate semantic meanings, but also reflect characteristics of different things. Chinese is typical ideography. Chinese characters and words have very high Iconicity. This thesis divides the similarity on this level into Chinese characters and compound words, and then has further discussion. According to its coinage principle, Chinese can be divided into pictographic character, self-explanatory character, associative compound character, synonymous character, pictophonetic character and phonetic loan character, and among which, the similarity of pictographic character describing natural world is the highest and the similarity of phonetic loan character, which is totally different from borrowed character pattern and meaning, is the lowest. The similarity of Chinese compound words is mainly reflected in compound words that show coordinating relation, including time sequence, whole-part sequence, center-surround sequence and speaker-centered sequence etc. The Iconicity of Chinese syntax is showed in sequence Iconicity, distance Iconicity, quantity Iconicity and markedness Iconicity. Sequence Iconicity refers to that word order is in parallel with the occurrence sequence of events and concepts in language linear arrangement. And the components of syntax are arranged according to time sequence or space sequence. Distance Iconicity refers to that language sign distance is similar to concept distance and it is mainly reflected in the relationship of modifier and central word. Quantity Iconicity refers to that the syntax components of important, quantified and complicated information are large and the forms are complicated. Markedness is similar to extra meaning. The sequence for markedness to develop from nothing is similar to the natural sequence of cognition, and that’s markedness similarity. Language is reflected through human’s cognition process and its process is objective world→ cognition→ concept→ language form. That’s to say, language similarity is not just about reflecting objective world directly, and the more important thing is to reflect people’s cognition mode on external world. There are rules for people to know the world and these rules will inevitably be reflected on language forms.

      • KCI등재

        중국교육사(中國敎育史) 특집논문(特輯論文) : 학전비(學田碑)와 송원(宋元) 학전(學田) 제도화 확립의 노력

        이설 중국사학회 2010 中國史硏究 Vol.69 No.-

        學田은 학교가 소유한 辦學(학교설립) 경비의 내원이 되는 田産을 지칭하는 것으로 주로 租佃耕種의 수입에 의거한 贍學(학교를 부양하는 것)이다. 設田贍學 제도는 북송시기에 처음 시작되었고 송대 교육제도의 보급에 따라 부단하게 발전하여 곧장 청 말까지 이어졌다. 비석 명기 혹은 널리 세상에 드러내는 것 등을 통한 학교교육과 관련 있는 소식은 중국 고대 교육사상 하나의 매우 특수하고도 중요한 현상이다. 이런 碑刻은 학교 창건 경과나 중수, 盛擧를 명기하거나 혹 학규 제어 및 각 지의 학교 설립 규칙을 새기거나 관민 사신이 자본을 기부하여 학교에 도움이 되는 공로의 자선행위를 기록하여 그 중 고대 학교 발전 경제의 명맥이 되는 학전은 더욱 비각 기재의 하나의 중요한 내용이 되었다. 비문은 학전의 내원, 경영관리 및 재산권 분류에 대해 모두 상당히 풍부한 기록이 있어 고대 중국의 교육 경비 제도를 고찰하는 데에 가장 중요한 자료를 제공한다. 최근 20년 동안 학전제도와 관련된 학술 성과는 비교적 풍부하여 각종 역사 문헌자료도 비교적 충분한 발굴과 이용을 얻었지만 학전비의 학술가치에 대해서는 아직 충분히 중시하지 않아 이는 근년 학전 연구 중 하나의 공백점이라 할 수 있다. 본 논문은 비각 내용이 반영하는 송원시대 지방이 學田 유지, 學産 유실을 방지하기 위하여 진행한 제도화의 노력에 대해 초보적 분석을 하고자 한다.

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