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허예림,이철언,박수연,최진주 한국전자파학회 2019 한국전자파학회논문지 Vol.30 No.6
This paper presents the design of a water-cooled radio-frequency(RF) load with simple structure, for use in the ultrahigh-frequency (UHF) band. After establishing a formula to obtain the physical properties that affect RF matching, we measure the permittivity and tanδ(Loss tangent) of tap water. Because the temperature of tap water increases upon applying high power, we measure the permittivity and tanδ for all changes in the temperature of tap water. In order to reduce the length of the water-load, molybdate with high tanδ is mixed with tap water. The loss tangent of the mixture is found to be approximately 26 times higher than that of tap water. Finally, we manufacture a water-cooled RF load and measure its characteristics. A reflection coefficient of −19 dB and bandwidth of 15 % is obtained at 460 MHz.
Perifolliculitis Capitis Abscedens et Suffodiens 1 예
최종성,이유신,이철언 대한피부과학회 1976 大韓皮膚科學會誌 Vol.14 No.4
We presented a case of perifolliculitis capitis abscedens et suffodiens associated with acne conglobata in 40-year-old rnale. He had a sausage-shaped plaque containing many fistular tracts on right temnporal area and cicatrizing alopecia on occiput. On the middle portion of upper back he had a adult fist-sized plaque containing many fistular tracts. Histopathologically epidermis showed mild byperkeratosis and keratotic plugging and in the dermis most hair follicles were destroyed and replacel by fibrous tissue but there were moderxte cellular infiltration composed of neutrophils, lymphocytes a.nd hist.iocytes around the remained hair follicles. On serum electrophoresis alpha,-globulin was elevated and gamna globulin was the upper liviit of nornal variation. Skin tests with murnps vaccine, dinitrochloro benzene (DNCB) and old tuberculin disclosed the evidence of de reased c $quot;ll-mediated immunity(CMI). All th se findings suggest thzt immune rriechanisni r,-ay be concerned ivith the pathogenesis in this case. He was treated with th internal administration of antibiotic and corticosteroid and with surgical opening and curettage of fistular tracts.
아연을 코팅한 테프론 기판 위에 성장된 산화아연 박막의 후열처리 효과
김익현 ( Ik Hyun Kim ),남기웅 ( Gi Woong Nam ),이철언 ( Cheol Eon Lee ),김동완 ( Dong Whan Kim ),최현광 ( Hyon Kwang Choi ),김양수 ( Yang Soo Kim ),김진수 ( Jin Soo Kim ),김종수 ( Jong Su Kim ),손정식 ( Jeong-sik Son ),임재영 ( Ja 대한금속재료학회(구 대한금속학회) 2015 대한금속·재료학회지 Vol.53 No.6
ZnO thin films were first grown on Zn-coated Teflon substrates using a spin-coating method, with various post-heating temperatures. The structural and optical properties of the ZnO thin films were then investigated using field-effect scanning-electron microscopy, X-ray diffractometry, and photoluminescence (PL) spectroscopy. The surface morphology of these ZnO thin films exhibited dendritic structures. With increasing post-heating temperature, all samples preferentially exhibited preferential c-axis orientation and increased residual tensile stress. All of the films exhibited preferential c-axis orientation, and the residual tensile stress of those increased with increasing post-heating temperature. The near-band-edge emission (NBE) peaks were red-shifted after post-heating treatment at 400 ℃. The intensity of the deep-level emission (DLE) peaks gradually decreased with increasing post- heating temperature. Moreover, the narrowest ‘full width at half maximum’ (FWHM) and the highest intensity ratio of the NBE to the DLE for thin films, were observed after post-heating at 400 ℃. The ZnO thin films fabricated with the 400 ℃ post-heating process provided the highest crystallinity and optical properties.(Received March 04, 2014)