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정동화 中央大學校 韓國敎育問題硏究所 2001 韓國敎育問題硏究所論文集 Vol.- No.16
It is necessary to investigate the concept and pattern of the organizational culture in order to offer basic materials inducing the profit gaining, the consumers' satisfaction. and the participation in the daily athletics by means of the understanding of the organizational culture in commercial sports centers . 1.An organization can be defined as a mediative system to accomplish its object by means of the division of labor and the hierarchy of Power, and so the culture has a microscopic meaning, which can be called the refinement of spirit. 2.The organizational culture has two opposite functions; one can be called a progressive for the systematic stability of a society; the other is a retrogressive function which can be thought a condition against an innovation. 3.For the accomplishment of the object, the organizational culture is made up of various forms of value. ideology, creature. strategy, members, circumstances, systems, rules. Consciousness, images, belief, symbols, attitudes, myth, and so on 4. The pattern of the organizational culture can be divided into two dimension; one can be said a maintenance-oriented and activity-oriented dimension; and the other intimate, progressive, conservative , reasonable dimension.
鄭東和 순천대학교 공업기술연구소 1993 工業技術硏究所論文集 Vol.7 No.-
Recently, the elimination speed sensor has been one of the important requirement in vector control systems, because the speed sensor spoil the ruggedness and simplicity of induction motor. This paper proposes sensorless vector control for high performance of induction motor. The proposed vector control scheme is based on a rotor flux and speed control which are calculated from the stator voltage and currents with improved flux estimator. The characteristics of vector control employing stator voltage and current generally deteriorate as the speed gets lower because the calculated rotor flux depends on the stator resistance and it is difficult to calculate rotor flux at low speed of standstill. This new control system is that the stator resistance influence reduces on the torque control, and it makes possible to calculate rotor flux at low speed of standstill. These features are verified by the simulation results.
파라메타 추정에 의한 VSI-IM 시스템의 새로운 適應 벡터 制御
鄭東和 順天大學校 1991 論文集 Vol.10 No.1
In the indirect vector method, the rotor resistance variation caused by operating emperature change is an undesiable nature. A new adaption alsorithm to compensate for the rotor resistance change based on the on-line estimation of field vector which requires the measurements of stator voltage and rotor speed Also, minimum variance controller is presented for the adaptive performance. This algorithm has been tested by simulation and experiment of the VSI-IM system, and the results are discussed.
鑛物性 冷却油의 Coolingability에 관한 硏究
김옥삼,최은순,정동화 麗水水産大學校産業技術硏究所 1992 産業基術硏究所 論文集 Vol.1 No.-
The laboratory quench method used in this study is based on plunging a silver cylinder heated to 800±1℃ into mineral base oils at given temperature. Experimental apparatus and measuring method followed the Korean Industrial Standard. Cooling curves at the boundary of the shape of cylinderical type measured by a silver-alumel thermocouple is recorded throughout the quenching period. Using the cooling curves, the collingability of the quenching oils at a various temperrature were compared and discussed.
인천 지방의 民謠考 : 南東區 논현동 도림동 고잔동을 중심으로
鄭東華 인천교육대학 기전문화연구소 1992 기전문화연구 Vol.21 No.-
1. Summary The folk songs gathered in this field research are analyzed according to the function and the theme. The results drawn from their distribution, content and form are as follows : First, in the aspect of the distribution, 4 folk songs for the adult and 14 for the child are gathered, but only 2 for the adult and 8 for the child of them are printed in this study, This amount is less than that of any other district. The reason is that the folk songs here seem to have disappeared in the whirlpool of civilization of a big city, Inchon, close by Seoul. Second, in the aspect of the content, 2 funeral songs are gathered. Their themes are to lament transient life and to praise filial duty. As to the aspect of the thought, they are drenched in nihilism and optimism and shamanism. The folks seem to be characteristic of the optimist. Third, in the aspect of the form, the main rhythms are dimetric 4,4 syllabic for the adult and dimetric 3,4 syllabic for the child, but trimeter is an important meter shown up repeatedly. As to the aspect of the composition, adult's folk songs are composed of a series of stanzas, whereas child's folk songs are composed of a single stanza. As to the aspect of the manner, adult's folk songs are sung In the manner in which one person's question is followed by the answer in chorus, whereas child's songs are sung in chorus or in solo. 2. Conclusion This field research has a poor harvest in gathering folk songs and good folk songs as well. The reason is that the district is a big city where few human resources enjoy and hand down traditional culture like folk songs. This follows from the fact that the development of mass communication and machine civilization results in the extiction of oral tradition. This research shows that it is difficult for the college alone to collect data of oral tradition. So it is suggested that the government take a proper measure promptly for collecting and preserving oral tradition.