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Microstrip Array 안테나의 최적설계에 관한연구
하천수,김종천 金烏工科大學校 1992 論文集 Vol.13 No.-
In this paper, An improved equivalent transmission line model for the rectangular microstrip patch antenna was presented and applied to the optimum design program. Rectangular microstrip patch array antenna was designed and fabricated by using improved equivalent transmission line model and measured results are compared with computed values.
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朴天秀 한국고대사학회 2002 韓國古代史硏究 Vol.27 No.-
Since the prehistoric age, the relation partner of Guyaguk in the Gimhae was the Guju force, which had traditionally played a role as an international gateway of the Japanese archipelago. In the Geumgwangaya period, its gateway was replaced by the Ginai force. The Yangdong - ri force was declined and the Daeseong dong force emerged in such a process. Simultaneously, in the Japanese archipelago the north Yamato force and the Gawajji force rose into power, in the middle of the weakening of the force, based on the southeast region of the Nara basin. As shown in the above, we can know that the relation between the Korean peninsula and the Japanese archipelago played an important role in the shift of power in political regimes of the Geumgwangaya force and the Ginai force. Goryeong - based Daegaya achieved epochal development in the late fifth century. That is, Daegaya expanded its force ranging from the Hwanggang hydrosphere to the Seomjingang and Geumgang hydrospheres. Besides, in this period, two facts are noted: One is that some forces relied on the relation with Geumgwangaya in Gimhae were decayed. Another is that those big chiefs who were connected with the Daegaya force appeared in many regions of Japan. These facts are supported by the prestigious artifacts of Daegaya style, which were found in the leading chiefs' tombs in the Japanese archipelago. Daegaya occupied a leading position in the relation with Wae, and this became motive power, which enabled it to dominate Geumgwangaya, Aragaya and Sogaya and to grow as a central state in the Gaya region. Before and after 500, however, the importing country of material culture in the Japanese archipelago changed from Daegaya to Baekje, and hence Wae - originated material culture has extensively been found in the Yeongsanggang valley, which had a close relation to Baekje. The decadence in the relation with Wae was acted on as an important factor, which led Daegaya to decline and eventually, collapse. In archeological data, it is assumed that the full - scale trade between Baekje and Wae became motive power for the appearance of the Gyeitai dynasty, based on the fact that the trade began before and after sixth century. The Gyeitai force gained predominance in Ginai by attempting to be different from the Gawajji force. This force excluded the Gaya force, which had traditionally had a close relation with the Japan archipelago, and introduced advanced material culture from Baekje. It is believed that before and after this period, people buried in the keyhole - shaped tumuli in Jeollanam - do and Jeollabuk - do were members of the Wae descent group, which was dispatched by the Baekje kingship so as to dominate and restrain native forces and to capture Daegaya, given the construction period, distribution scope and funeral objects of the tumuli. After the collapse of Hanseong, Baekje under the temporary downfall of its control organization received military help from Wae in order to rule over the south region and to capture Daegaya. It is inferred that, as a consideration of such help, Baekje transmitted Wae material culture necessary to national consolidation.
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河千洙 國立金烏工科大學校附設生産技術硏究所 1986 産業技術開發硏究 Vol.2 No.-
직선편파에서 원편파로 바꾸는 편파변환장치는 원형도파관내에 유전체판을 삽입하거나 금속물체나 핀을 삽입하여 편파를 변환하는 장치가 개발되어왔다. 본 논문에서는 spread-squeeze도파관을 사용하여 직선편파에서 원편파, 또는 그 역으로 변환하는 도파관 편파 변환기가 연구되었다. X-밴드에서 모드 변성기와 혼 안테나 등을 사용하여 실험 측정한 결과는 이론과 매우 잘 일치하였다. A convert between linear and circular polarization has been designed in circular waveguide by the use of dielectric vanes, metal ridges or pins. In this paper was studied waveguide polarizer for converting circularly polarized wave to linear by the use of spread-squeeze waveguide. Experimental results of tests carried out at X-Band, using mode changers and horn antenna, well agree the theory.
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河千洙 金烏工科大學校 1990 論文集 Vol.11 No.-
The data communication using the existing public switched telephone network(PSTN)has been perfomed its transmission by modulator & demodulator(MODEM), however, at present the maximum velocity of the MODEM is limited up to 9600bps. this limitation caused, when a lot of data were transmitted many kind of demerit such as time and cost.etc. In this paper, modified frequency shift keying(MFSK)method was proplsed which can make high speed data transmission at 22400bps rather than 9600bps. If this method is applied to existing still picture, and also to transmit a qusis-animated picture. The theoretical analysis was first studied on the system of MFSK method, then its experiments on the implementation for the design fo the transmitting and receiving system manufactured in the laboratory. Moreover, test resulting was good agree with computer simulation.
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박천환 부산교육대학교 초등교육연구소 1992 초등교육연구 Vol.2 No.-
The purpose of this study was exploration of primary school teacher aptitudes and developmet of assessment method of these aptitudes. The questions can be specified as follows: 1) What are primary school teacher aptitudes? 2) What is the method to assess teacher aptitudes? Through a review of literature, four factors as teacher aptitudes were identified; academic aptitude, verbal skill, thiking ability, and attitude and value on teacher. To assess these factors as entrance examination, some lmitations: problem of measurement and relationship to other tests - were suggested. Academic aptitudes assessment included basic skills of art, music, and sports. Verbal ability, thinking ability and attitude abd value on teacher could be assessed by interview or paper test confronted the problem situations. The validity and reliability of these assessment must be ensured.
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