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유전체 코팅된 유전체가 채워진 에지 슬롯 안테나의 해석
손현,김중표 경북대학교 전자기술연구소 2000 電子技術硏究誌 Vol.21 No.1
When a dielectric-filled edge-slot(DFES) antenna, which is made by circumferentially removing the outer conductor of a coaxial waveguide is coated by a dielectric layer for radome, characteristics of antenna are investigated theoretically. The integral equations are derived by use of the Fourier transform and mode expansion, and the simultaneous linear equations are obtained. The effects of the slot width and thickness, and dielectric coating are examined, and the reflection coefficient and radiation pattern are presented.
The Meaning of Places in Jude the Obscure
손현 연세대학교 영어영문학회 1994 영어영문학연구 Vol.16 No.-
Hardy says in 'Preface' to Jude the Obscure, "Like former productions of this pen, Jude the Obscure is simply an endeavour to give shape and coherence to a series of seemings, or personal impressions, the question of their consistency or their discordance, of their permanence or their transitoriness, being regarded as not of the first moment."1) This impressionistic statement seems to have influenced some critics' judgments of the work in a negative way, as Hardy's last novels, especially Jude the Obscure, have been largely observed to evince increasingly personal and aesthetically undisciplined meditations or attacks on human fate and certain social institutions. For Carl Weber, Jude the Obscure is simply an unconstrained propaganda. He says, "If Hardy failed, as he did, it was not because the novel, as an art-form, is unfitted to bring about social reform; it was because Hardy's aim was too sweeping, his skill too defective, and--it must be admitted--his artistic control too frenzied."2) And Arthur Mizener disapproves of the quality of Jude the Obscure as a tragedy because "Hardy never really posed for himself the question on how the meaning of his impressions could be coherent without being consistent."3) He blames Hardy's too personal involvement in the novel, which renders the author's doctrines the only test of value, for the failure of the novel as a tragedy.
유전체층으로 덮힌 윗면의 주기적인 슬릿을 갖는 평행평판 도파관으로부터의 누설파 복사
손현,이종익,조영기 경북대학교 전자기술연구소 2000 電子技術硏究誌 Vol.21 No.1
Leaky wave radiation problem from a parallel-plate waveguide(PPW) with finite number of periodic slits in its upper plate covered by a dielectric slab is considered for the TEM wave incidence case. Integral equation for the electric field over the slits is derived and solved numerically by use of the method of moments. Some numerical results for the quantities of interest such as reflected and transmitted powers in the PPW, the coupled power through the slits, the radiation efficiency into the free space, the surface wave launching efficiency into the slab from the slit, antenna gain, and radiation patterns against dielectric thickness are presented. Especially, the effect of the dielectric cover on the performances of the slitted leaky wave antenna is discussed in detail.
축방향의 슬롯과 두께를 가진, 유전체로 코팅된 원통형 실린더의 역산란 레이다 단면적 특성
손현,김중표,강호준 경북대학교 전자기술연구소 2000 電子技術硏究誌 Vol.21 No.1
The backscattering echo width solution of a dielectric coated slotted circular cylinder with thickness is investigated by using mode-matching technique. It is shown that not only coating material and size of the geometry, but also thickness of the slotted cylinder can cause great influence to the RCS characteristics of the cavity goemetry. It is also found that the slot material can plays important role in RCS variation of the slotted cylinder with thickness.
평행평판 도파관의 유한한 주기적인슬롯으로부터 누설파 복사에 유한한 구형 격자의 영향
손현,김중표 경북대학교 전자기술연구소 2000 電子技術硏究誌 Vol.21 No.1
The effects of finite corrugations on leaky wave emanated from the parallel-plate waveguide with finite periodic slot are investigated theoretically. The analysis procedure is consisted of deriving the integral equations for the equivalent magnetic currents over the slots and solving it by use of the method of moment employing the pulse basis function and point-matching scheme. The effects of the corrugation depth, the corrugation gap and the corrugation period are examined. Corrugation also takes effect to improve very bad leaky wave characteristic for the very low height of the parallel-plate waveguide.
孫鉉 경북대학교 공과대학 1977 工大硏究誌 Vol.6 No.-
The tests for quality control on FDM multiplex-microwave communication system are compared with DCA of US Army regulation and CCIR/CCITT recommendation. This paper has been suggested the best methods and standard values for quality control on the commercial microwave communication system.