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尹榮重 大田開放大學 1986 論文集 Vol.5 No.-
The point at which the regularity of a complex function f(z) disappears is a singular point f(z) is if one-valued regular function, but it is not always regular at every point, in this case the irregular point is an isolated singular one. It is proved to be equivalent to an analytic function that a complex function is a regular one within a domain. The function elements which can the analytic functions are connected by analytic continuation. The kinds, forms and properties of the singular points of the functions are studied, and it is shown that the functions are extended to Cauchy's integral formula.
박주형,이상렬,윤형국,윤영중 延世大學校 電波通信共同硏究所 1999 電波通信論文誌 Vol.4 No.1
We have designed and developed narrow bandpass multipole filters for satellite communication using ??(YBCO) thin films on MgO substrates. The superconducting film used in this study was prepared by laser ablation on one side polished MgO (100) substrates. A Nd:YAG laser was used to fabricate YBCO thin films. The wave length of the laser was 355 nm. The laser beam was focused onto a YBCO target rotating linearly to avoid deep craters that may eject macroscopic YBCO particles. The YBCO films were grown at 750 ℃ in the oxygen partial pressure of 200mTorr. The deposited YBCO thin films were patterned by conventional wet-etching method. The transition temperatures of YBCO thin films were 85 - 88 K and the film thicknesses were about 5,000 A. By comparing the performances of normal-metal filters and YBCO filters, we observed that superconducting YBCO multipole filters have been showed superior performances at 77 K.