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      • 磁氣抵抗 電動機의 特性解析에 關한 硏究

        周秀元,李承煥 東亞大學校 1974 東亞論叢 Vol.11 No.2

        一般的으로 圓筒型 回轉子를 가진 3相交流電動機의 磁界 解析에서 空隙은 一定하고 回電子捲線 電流에 의한 起磁力이 空隙起磁力에 포함된다. 本 論文에서는 空隙起磁力은 固定子捲線 電流에 의한 起磁力만이며 空隙이 圓周方向의 變數라는 점을 감안함으로써 磁氣抵抗 電動機의 解析에 圓筒型 回轉子 電動機의 磁界 解析에 의한 解析法을 適用하였다. 解析에 使用된 segmental rotor는 從來의 回轉子와 다르며 이 兩機器의 磁氣回路와 特性을 비교검토하였다. 直軸 리액턴스는 機器 構造를 나타내는 定數들로 表現되므로 모든 特性方程式도 이 定數들과 負荷角으로 나타난다. 故로 回轉子의 構造를 바꾸어서 特性을 改善할 수 있다. 定常狀態의 動作特性은 Stroboscope에 의해 測定된 負荷角에 의해 決定되었고 計算값과 잘 一致했다. Generally in the analysis of magnetic field of three phase moter which has cyrindrical rotor air gap is constant and the magneto motive force of rotor winding current is cont ned in the magnetomotive force of the air gap. In this paper, the method of the analysis of magnetic field of three phase motor was adaped in analysis of reluctance motor in which only the MMF of the stator winding exist in the MMF of the air gap and the air gap is a variable along the cyhindrical direction. The segmental rotor used in this analysis is different from the conventional one and the difference of the magnetic circuits and the performance characteristics was compared and reviewed. Since dirct-and quadrature-reactance are described with the constants which is rendered to machine configuration, all the characteristic equations is represented with this constants and load angle. And so the characteristics of this motor is improved by changing the rotor structure. The steady state performance was made by the load angle which is measured by the stroboscope. The results well coincided with the values of the computation.

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        지역 서점에서 사용자 경험에 영향을 미치는 요인에 관한 연구

        주수,김승인 한국디지털정책학회 2019 디지털융복합연구 Vol.17 No.3

        본 연구는 지역 서점에서 사용자 경험 만족에 영향을 미치는 요인에 관한 연구이다. 최근 증가하는 지역 서점에 대해 공급자 측면에서의 연구가 진행된 사례가 많다. 하지만 실제 사용자의 경험이 산업 발전에 중요하기 때문에 사용자 측면의 연구가 필요하다. 지역 서점을 독립서점, 전문서점, 복합서점으로 분류하여, 경험경제의 4가지 경험 영역의 구체적인 경험 요인을 설문을 통해 분석하였다. 경험 만족에 영향을 미치는 요인을 회귀분석을 통해 확인하였고, 통계적으로 가장 유의미한 수치를 보이는 요인으로 3가지 항목을 확인하였다. 이 연구는 기존 공급자 기준의 선행 연구들과 달리 실제 사용자인 고객 경험에 초점을 두고 주요 경험 요인을 파악하였으므로, 향후 지역 서점의 발전에 도움이 될 것으로 기대한다. This study is about finding factors affecting user experience satisfaction in Korean local bookstores which are increasing recently. Previous researches are concentrated on the aspect of supplier. However, a study for actual users is needed to help develop bookstore industry. The local bookstores were classified into independent, professional, and complex cultural bookstores. Based on the four realms of an experience by the Experience Economy, this study analyzed the experience factors through questionnaires. As a result of study, the three most significant factors influencing experience satisfaction were identified through regression analysis. It is expected that this study may help develop the local bookstores industry in the future by concentrating on the actual experience of the user and finding out the major experience factors.

      • 流行病 管理의 數學的 모델化

        周秀元 동아대학교 공과대학 부설 한국자원개발연구소 1985 硏究報告 Vol.9 No.2

        The new epidemic model, while remaining essentially deterministic in nature, incorports a very desirable feature of stochastie models by representing the latent and infectious period of disease by their mean values and respective standard deviation. The effect of application and variation of each of the active and passive vaccination controls has also been studied.

      • 미국의 武力軍事介入 決定要因에 관한 연구

        朱秀基 단국대학교 정책과학연구소 1991 정책과학연구 Vol.3 No.-

        The departure point of this study is concerned with armed military interventions by the United States. For almost half a century since the World War Ⅱ. American presidents have consistently claimed the right to protect the interests of the "Free World and democracy" against communism, even when such protection implies intervention in the domestic affairs of another nation. A strong argument can be made, and often has been, that the United States has been more interventionist since it adopted non-intervention as stated policy than it ever was before. In the three cases of armed intervention selected for this study (i.e., Lebanon in 1958, the Dominican Republic in 1965, and Grenada in 1983), American leaders recognized the troubles they invited by sending in troops, but still they chose to deploy. Why they did is the subject of this study. This is to say, the suject matter of the present study is concerned with an analysis of the decision-making process that led to intervention. It should be mentioned that the perspective is American on the whole. The emphasis is placed on what American decision-makers thought and what they thought they knew at the time they decide to intervene. Whether their perceptions were accurate and whether the interventions accomplished what they hoped are important but different questions, and they are not of concern with the present study. The present study, firstly examines several important factors common to the chains of events leading to the three decisions to intervene ; then, secondly, comprises an attempt to weigh the significance of the factors examined and to sketch the outline of a theory of American armed intervention. The important factors identified in the present study after probing into the three selected armed interventions are : ① the high level of domestic instability, ② the behind-the-scene power and an evil character, ③ the rush of events into a crisis, ④ the maintenanec of legitimacy, ⑤ the rescue and protection of Americans in danger, ⑥ the solid consensus among the decision-making participants, ⑦ the congreessional acquiescence and reluctant approval, and ⑧ the lesson from the past and other policy-making environment. It is quite plain that dimestic instability provided both the motive and opportunity for armed intervention. The importance of the behind-the-scene power and an evil character of Gamal Abdel Nasser in Lebanon and of Fidel Castro in the Dominican Republic and Grenada lay in its powers of simplification. Blaming all troubles on one bad man makes it easier for an intervening administration to sell intervention to the American public and to evaluate policy-alternatives for choosing one. In addition, the fact that events rushed to a crisis was instrumental in the creation of a solid consensus among decision-making participants and of a silent acceptance among the congressional leaders. The maintenance of legitimacy and the theme of "Americans in danger" appear to be the diplomatic sine que non of intervention. The request for assistance from an lawfully elected government provided the legitimation for the intervention in Lebanon, while the Organization of American States (OAS) and the Organization of Eastern Caribbean States (OECS) were utilized in the Dominican Republic and Grenada. Admitting that there were other objectives involved in the landing of American marines, each president did not fail to declare that the purpose of overriding importance was to protect innocent American lives. The spector of past mistake and lesson and other troubles emerged in international relations tended to push the decision-making in the direction of landing the marines first and asking questions later. Eisenhower intervened in Lebanon to demonstrate that the U.S. was more than a negative influence in the Middle East and to prove that the many commitments that Eisenhower and Dulles had undertaken around the globe would be met. When Johnson sent troops to the Dominican Republic, his action was a statement about American resolve in the Caribbean, but its significance for Southeast Asia could not be missed. Finally, for Reagan, Grenada offered an opportunity to act forcefully and to achieve a victory--however small--at a moment of frustration and defeat, derived from the Middle East and the Central America. In conclusion, intervention is, in many ways, an essentially symbolic act, meant for a larger audience than the intervened or the intervention victim. It seems quite ironic to say that, just like many standards of international conduct, the principle of non-intervention has often been honored more in the breach than in the observance among nations.

      • 簡略系統特性定數에 의한 調相設備의 最適計算法

        周秀元,金權洙,鄭亨煥 동아대학교 공과대학 부설 한국자원개발연구소 1985 硏究報告 Vol.9 No.1

        This study aimed at seeking system characteristic constant in power system as simple as possible and, by using it, calculating optimum reactive power source. The results are as follow. 1. The theory employed in this research showed the excellence of obtaining system characteristic constant as fast as possible. 2. Any system characteristic constant reasonable to the system's flow condition, whether it was on heavy or light load, was to be obtained. 3. The validity of the theory was affirmed by some calculating examples in terms of model system.

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