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RISS 인기검색어
- 검색키워드
- 저자 : 한재봉 (검색결과 8 건)
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Antennas are base component in any electronic system that uses free space electromagnetic wave transmission for communications. However, antennas can have very difference configurations and characteristics, depending on the purpose for which they are used and the frequency band for which they are designed. This paper presents analysis and design for various printed antennas for 2.4 GHz band. For the miniaturization of the antennas, dielectric substrate (ε_(r)=4.6) and planar line structure are used. So in this paper, treats of basic antenna (dipole) and directivity antennas(Yagi-Uda, Microstrip). The proposed whole antennas are simulated using HFSS. The results of the simulation are presented and compared with characteristics of each antenna. Especial, the proposed antennas can be applied to the design of various communication systems for 2.4 GHz band.
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銀行의 顧客滿足經營에 관한 硏究 : 濟州市 소재 C 市中銀行을 中心으로
한재봉 濟州大學校 經營大學院 1997 국내석사
These days the circumstances of Korean and foreign finance industries have been drastically changed. Therefore, it is important for a bank to secure fixed customers through their satisfaction of the bank service and in addition to manage the customers not to desert the bank in order to survive the competition with domestic and foreign financial institutions. This research has been made for the purpose for analysis of practical cases on the basis of theoretical facts centering on the bank of C, a commercial bank, in Cheju City. Surveys have been made to confirm how much customers were satisfied with the bank service. The survey of customers' satisfaction degree by the characteristic of population statistics shows difference according to job, while that of their satisfaction degree by formal characteristic shows difference in satisfaction degree about the service of accompanying facilities. There is difference in the satisfaction degree of bank service on the basis of degree of importance and also difference between satisfied group and dissatisfied group concerning the customers' using the bank continually in the future. General analysis shows that the security of savings is the most important element in the bank service and that the convenience of parking facilities is the most important factor in customers' satisfaction degree. The main reason for customers' frequenting the bank is to deposit and withdraw money. When the motivation of customers' choice of the bank is considered, distance is the most important factor. The development of goods to sponsor jobless people as financial goods bank will have to make urgently has the largest percentage of the response. In conclusion, this research presents sectors banks will have to focus on for customers' satisfaction after revealing important factors influencing bank service and reviewing customers' satisfaction degree.
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잔골재를 濟州道「송이」로 代替한 콘크리트의 實驗的 硏究
한재봉 朝鮮大學校 産業大學院 1986 국내석사
As the demand for concrete construction increases, development of substitutive materials for aggregate is needed to meet the lack of quality aggregate. Especially in Che ju-do the lack of aggregate is one of serious problems, which arises from the characteristic geological features of the island. So this study is designed to present a mechanical experiment on how to utilize the "Song-I" scattered all over Che ju-do as the substitutive aggregate for concrete. The study results are as following: 1) Even though it is pointed out as problematic that Che ju-do "Song-I" has much higher absorption factor and void ratio than the other general fine aggregate, it has lower specific gravity and better finess modulus in its physical quality, and it is expected that the "Song-I" will become more useful as a kind of substitutive aggregate, if only some measures are taken to supplement the higher absorption factor and void ratio. 2) The compressive strength of the concrete with "Song-I" is characterized as its W/C=45%; under the condition that the unit-cement content is 360kg/㎥ we can get the compressive strength of more than 250kg/㎠. But in order to supplement coutermeasure for the workability we need to conduct a continued study on how to use such mixing agents as highly effective water reducing agents. 3) The workability of the concrete with "Song-I" is W/C=65%; this indicates an extremely lower value of slump except in the case that the unit-cement content is 360kg/㎥, which is analyzed as being caused by the absorption factor, void and surface irregularity of "Song-I". 4) The quantity of the air contained in concrete is generally higher in the concrete with "Song-i" than in the concrete with transported sand. 5) The bending strength of the concrete with "Song-I" ranges from 27.03kg/㎠ to 35.04kg/㎠ and hardly finds any relationship with the compressive strength. In the case of the concrete with transported sand, however, the bending strength is 49.2~51.7kg/㎠ and keeps this constant value regardless of the compressive strength and W/C.
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