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RISS 인기검색어
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- 저자 : 강희우(Hee-Woo Kang) (검색결과 6 건)
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코발트 - 철을 전해석출한 양극산화피막의 제작과 자기특성
강희우(Hee-Woo Kang) 한국자기학회 1994 韓國磁氣學會誌 Vol.4 No.1
The magnetic properties of aluminum anodized film in which Co-Fe alloy electrodeposited are investigated with regard to the alloy composition of magnetic films. The electrodeposited Co-Fe particles are confirmed to be single phase Co-Fe alloys by X-ray diffractions. At 34 at% Co, the sample with small pore diameter(particle diameter 150 Å) has a large magnetic energy product(Bmax) of about 1.44 MGOe due to the large saturation magnetization, the high coercive force and good squareness of the M-H curve. However, for the samples with particle diameter larger than 450 Å, the bottom of each particle forms abnormal particle claaed branch-shaped unlike the sample of the particle diameter 150 Å. In this case, the magnetic anisotropy energy was about zero at the compositions of 45 and 75 at% Co. Moreover, at the compositions from 50 to 70 at% Co, the anisotropy became negative value. This means that an easy axis of magnetization of the film is in plane in plane in spite of the perpendicular shape anisotropy of the particle. It was found that the bottom extremity of the particle contains FeC from the X-ray diffraction. Thus the effect of the bottom extremity, that is, an unusal magnetic property was removed by electrodepositing Cu at the bottom extremity of the particle. Itis clear that the magnetic properties of the ilms are influenced by he branch-shaped bottom extremity filled with FeC.
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강희우(Hee Woo Kang) 한국자기학회 2001 韓國磁氣學會誌 Vol.11 No.1
We investigated to DC magnetic characteristics, the dependence of annealing temperature on the crystal grain and the crystalline orientation for grain-oriented silicon ribbon with 100 ㎛ final thickness manufactured by three times cold rolling method using the hot-rolled silicon steel plate as a raw material. The growth of (110)[001] Goss texture were almost observed in the whole area of the sample. The values of the saturation magnetic flux density Bs and the average a angle have 1.9 T and 4.6 degrees respectively. From this result we could be confirmed that the three times cold rolling method has a possibility of manufacture for oriented ultra-thin silicon ribbons much more simple and cheeper than the existing oriented silicon steel manufacturing method by means of more simplified producing process.
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김종오(Jong-Oh Kim),강희우(Hee-Woo Kang),김영학(Young-Hak Kim),김동연(Dong-Hyun Kim),오호영(Ho-Young Oh) 한국자기학회 1996 韓國磁氣學會誌 Vol.6 No.6
The developmement of electronic machine industries requires miniature of size as well as increasement of driving frequency in electronic parts, recently. To realize micro-struture of magnetic devices, in this study, we fabricated thin film inductors by using thin film manufacturing techniques such as photolithography and wet etching process, and these devices are measured at high frequency range of 1 ㎒~1 ㎓. The results are as follows. The accurate measuring technique by using network analyzer system having microstrip line was established. The manufactured inductors are fabricated with several ten micrometers by means of wet etching process known as easier and more economic than dry etching process. When the device size of two types (spiral, meander) is the same, inductance value L and quality factor Q of spiral type devices are larger than those of meander type, but driving frequency of spiral type is lower than that of meander type due to increasement of inductance L. It is necessary to decrease resistance value R by increasing cross section of the conductor film coil. Thus high frequency measuring method would be a very useful for another measuring fields of the range over several hundreds ㎒.
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姜熙雨,成世鎭 충남대학교 공업교육연구소 1985 論文集 Vol.8 No.1
Cycloconverter is widely used as for variable voltage variable frequency(VVVF) ac drives. Because its characteristic of operation is phase control, it produces much reactive power at the high frequency side. In this paper, a control method of the circulating current, which produces reactive power at the high frequency side, is presented and analysis of its effect is performed. Some results of digital simulation shows the validity of the above analysis.
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강희우,김홍기 주성전문대학 2008 論文集 Vol.17 No.-
In this paper we certified that the excessive inverse voltage due to relay coil inductance L occurs controller CPU error in lamp control system By choosing varistor with a protecting function for immoderate voltage we could solved the problem of controller CPU Error. We developed home product of the remote controller relay with both automatic breaking and remote control switching function together adopted a new safety device in each control line. In conclusion we could make more improvements largely the saving of energy as well as the safety for the light control system controller with maximum 128 lines be able to do simultaneous on-off control operation.
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