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        RuO2-coated MoS2 Nanosheets as Cathode Catalysts for High Efficiency LiO2 Batteries

        정요섭,장유진,박소정,이윤정 대한화학회 2019 Bulletin of the Korean Chemical Society Vol.40 No.7

        Despite their potential for high capacity, lithium oxygen (Li?O2) batteries still suffer from the low round-trip energy efficiency and limited cycle life, mainly due to the slow decomposition of discharge products. Therefore, developing efficient catalysts is a key issue for the practical application of Li-O2 batteries. Ruthenium oxide (RuO2) is one of the most efficient catalysts developed thus far for lithium-air batteries. However, the high price and limited availability of Ru prohibits its large-scale use in practical device fabrications. Recently, molybdenum disulfide (MoS2) has been actively investigated in various catalytic systems, taking advantage of its two-dimensional (2D) structure and catalytic activities. However, the low electrical conductivity of MoS2 limits the realization of fully operative MoS2-based catalysts on its own. In this report, RuO2-coated MoS2 nanosheets (RuO2/MoS2) are prepared and implemented as cathode catalysts for Li?O2 batteries. In this hybrid structure, RuO2 and MoS2 complement each other; the poor electrical conductivity of MoS2 is overcome by the nearly conformal coating of conducting RuO2, while 2D MoS2 nanosheets act as excellent supports for RuO2 catalysts and also contribute to the overall catalytic activities. These combined features result in excellent cathode performance, including improved efficiency and cycling lifetimes, with significantly reduced amounts of precious RuO2.

      • 日帝治下의 브·나로드 運動에 관한 硏究

        丁堯燮 淑明女子大學校 1974 論文集 Vol.14 No.-

        The purpose of this essay is to put in order and systematize our rural enlightening movement which occured and developed in our race by itself during about ten years from 1925 to 1935 under Japanese Rule. The contents are as follows: 1. Here is discussed 1930s' cultural and social backgrounds which provoked the Vnarod Movement as a whole national movement. 2. It is stated that the organs of the press like "Chosun Il-bo(朝鮮日報)" and "Donga Il-bo(東亞日報)" spread out the rural enlightening movement. 3. Here is a discuss on about "Korean Language Association(朝鮮語學會)" as a leading player of mother tongue spreading movement. 4. YMCA and YWCA also developed the rural enlightening business and movement. Especially women's brilliant activity is mentioned here. There were Hwang Ai-duck(黃愛德) and Kim Ro-duc(金路得) as the leaders of the Vnarod Movement, Choi-Yong-sin(崔容信) who spread the movement at Sam-gkol, Soo-won(水原) in the early 1930, and Kim Chung-ock(金貞玉) who developed the movement at Itai-won(梨泰院) Methodist Church as a center place of the movement. 5. The movement which was desplayed in the magazine "Korean Farmer(朝鮮農民)" is discussed. 6. Here is precisely mentioned about the first, the second and the third Soo-won Agricultural Profession college affair (水原高農事洋) which is indispensably correlated to the movement. 7. The followings are conculsions:

      • KCI등재
      • KCI등재
      • 韓國의 人事行政과 그 歷史的 背景 : 官僚主義를 中心으로 한 On Bureaucracy

        丁堯燮 淑明女子大學校 1964 論文集 Vol.4 No.-

        (1) In the Preface, it is discussed that political, administrative behavior in Korea has been conducted on authoritarianism. (2) Discussed are social characteristic in Yi-Dynasty. (3) Contents of public personnel administration in Yi Dynasty are surveyed, and the reason why this administration failed and the process how Yi Dynasty bureaucracy collasped are treated of. (4) During Japanese colonization of Korea, how discriminatingly the Japanese gave public personnel administration against the Korean people is discussed. (5) Public personnel administration under the U.S. military provisional government is surveyed. (6) Public personnel administration from establishment of Korea up to the Second Republic is discussed. (7) In Conclusion, discussed is ideological elements which prevent modern public personnel administration from being established.

      • 英國의 選擧制度와 그 運營

        丁堯燮 淑明女子大學校 1966 論文集 Vol.6 No.-

        The Electoral System and Its Operation in England In the present study English electoral system is introduced and some problems related to the operation of the system are examined. Problems examined include the following: 1) Problems of electoral circumscription......Problem areas in which this study has been undertaken are the single-member system, the boundary commission, the principless of delimitations of constituencies, and the fair management of them. 2) Problems of electoral management...the discussion includes the details of tte electoral procedures, the nature of returning officer, problems in the expenses management, the preparation of the list of electors, the ballot and voting methods, and the opening of voting box. 3) Problems of candidates system......How the candidates are selected and nominated is studied. 4) Problems of Political Campaign......How the vote-getting activities of the party are taken place before the election is discussed. 5) Problems of English people's voting Behavior......Characteristics of the voting behavior are enumerated. Special emphasis is being made on the Policy-Oriented attitude of the English people. In the conclusion, some recommendations applicable to the Korean situation are drawn from the analysis in the foregoing research items.

      • 民主政治成功의 前提條件 : Anti Japanese Movement

        丁堯燮 淑明女子大學校 1973 論文集 Vol.13 No.-

        (1) This essay demonstrates pre-requisite to the success of democracy synthetically, while authoritative records about democracy refer to this matter partially in Europe and America. (2) This essay devides pre-requisite to the success of democracy into two kinds: essential pre-requsite-spiritual pre-requisite(character and attitude of people), economical pre-requisite(high level wealth), social pre-requisite (levelling of wealth) and international pre-requisite(existance of international peace); complementary pre-requisite natural pre-requisite (safe situation in national defence) and racial pre-requisite (homogeneity of race, language, religion, and custom). (3) Here it is emphasized that above all spiritual pre-requisite which elevates refinement and self-awakening of people and also economical, racial, and international pre-requisite should be prepared preceding everything else in order to realize essential spirit of democracy and to exhibit the merit of democracy. (4) Here are stated 5 points as a spiritual pre-requisite and constitutional law structure; 1) What European and American ask as a necessary sentiment to their people; 2) A weak point contained in democracy; 3) the character and concrete attitude of people which are able to eliminate a weak point contained in democracy; 4) seven democratic attitude expressed in American constitutional law; 5) spiritual pre-requisite viewed from the side of constitutional law structure for the success of democracy. (5) Economical re-requisite is absolutely important for the success of democracy. That is: 1) everyone's life necessarily have something in reserve in order to elevate his refinement, because as refined people, economical condition enough to enjoy their independent life as a human being, and enough not to sell himself to the power of money and power is absolutely necessary. 2) Economical pre-requisite is viewed from the side of devision of wealth and production of wealth. 3) Economical pre-requisite is viewed from the side of constitutional law structure for the success of democracy. (6) Importance of social Pre-requisite is stated. That is: 1) the smaller distance between the haves and the have nots is the better as social pre-requisite. In other words, majority if people should belong to middle class. 2) Social pre-requisite is viewed from the side of constitutional law structure. (7) International peace is necessary for the success of democracy. Wise sayings which point out the feature of crime in war are examined. (8) A nation should be sityated in geographically safe position as a natural pre-requisite. (9) 1) Independent indepence of one race is a necessary pre-requisite for a demecratic nation. 2) Homogemeity of race, religion, language and custom is necessary as a racial pre-requisite. (10) Prevention policy against a fault in democracy is viewed from the side of constitutional law structure. (11) As a conclusion, 3 points are clarified. Thise states which are not prepared these pre-requisite cannot expect to succeed in democracy; sooner or kater, they would oblige to concede their position to something else than democracy. Those states which are prepared for these pre-requisite could continue their democracy. Even in those states which could contine their democracy, their success of democracy depends on the degree of preparation for these pre-requisite.

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