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분말충진방법과 가공정도에 따른 Ag/BSCCO 초전도선재의 특성
지봉기,김태우,김정호,김중석,주진호 成均館大學校 科學技術硏究所 1998 論文集 Vol.49 No.1
We evaluated the effects of processing variables on interface irregularity. microstructure. and resultant Jc of BSCCC superconductor tape. For the tapes made by PIT technique. the degree of interface irregularity was varied with powder packing methods and forming process variables. It was observed that the degree of interface irregularity of the tape by CIP method was more reduced. compared to that of the tape by ram method. In addition. the degree of interface irregularity was promoted with decreasing the dimension of tape during forming process. As the dimension of wire/tape were changed from diameter of 3.25mm to thickness of 200㎛ during forming process. Jc value was observed to be increased by 10 times. It was likely that the improvenment of Jc was mainly result from the enhanced texturing of 2223 grain. Microstructural investigation showed the degree of texturing was degraded by the existence of both second phases and interface irregularity. If the interface was flat, larger grain size and better texturing near interface were developed compared to those inside superconducting core, The improvements of microstructure near interface may be result of reaction between Ag and superconductor phase.
쇼핑호스트에 대한 의사인간관계가 홈쇼핑 TV에 대한 태도 및 구매의도에 미치는 영향 : 지각된 위험과 지각된 혜택의 매개효과를 중심으로
주지혁,최명일,김봉철 한국방송광고공사 2008 광고연구 Vol.0 No.80
Home-shopping in cable TV is considered as one of the important channels by innovative changes for the shopping. In this process, shopping hosts take a great portion, but they are not weighted in other studies. This study explores various emotions for the shopping hosts in the field of parasocial interaction and examines how those emotions affect to purchase intention. Also, the study can see over how perceived risk, perceived benefit, and attitude for the CATV home-shopping have an impact on the purchase intention. In the result, as parasocial interaction with shopping-hosts would grow, perceived risk for home-shopping is reduced, meanwhile perceived benefit is grown. Perceived risk can mediate purchase intention, and perceived benefit also can moderate attitude for homeshopping and purchase intention. It could mean that consumers can have positive image for CATV home-shopping under the conditions that parasocial interaction with shopping-hosts would be grown. The result can show that CATV home-shopping should attempt to establish parasocial interaction in order to take upper hands against open markets and internet shopping malls.
발열이 동반된 호중구 감소증 환자에서 경험적 치료제로서 cefepime 단독요법과 ceftazidime 단독요법의 효과 비교 연구
이동현,김춘관,고지영,마주락,이가영,천상열,김봉석,노용호 대한화학요법학회 2002 대한화학요법학회지 Vol.20 No.3
발열이 동반된 호중구감소증 환자에서 초기경험적 치료제로서 cefepime은 선택될 수 있다.Cefepime 단독요법은 ceftazidime 단독요법과 비교하여 동등한 임상적 성공률을 보였으나, 향후 더 많은 환자를 대상으로 한 비교연구 및 자료의 보충이 필요하다 하겠다. Background : In view of the recent trend toward monotherapy in the treatment of bacterial infection, we evaluate the clinical efficacy and safety of cefepime versus ceftazidime for the empiric treatment of febrile episodes in cancer patients with chemotherapy-induced neutropenia. METHODS : A prospective, double-blind, randomized study of cefepime 2g every twelve hours and ceftazime 2g every eight hours was performed in 40 adult neutropenic (absolute neutrophil count 〈500/㎣) cancer patients with fever. RESULTS : Forty patients were evaluable. Median duration of neutropenia was 11.5 days in cefepime and 10.5 days in ceftazidime. Treatment was successful in (60%)(12/20) of cefepime-treated patients and (65%)(13/20) of ceftazi야me-treated patients. Overall mortality was 10%(2/20) of cefepime-treated patients and 15% of ceftazidime-treated patients. CONCLUSIONS : Cefepime appears to be as effective as ceftazidime in the initial treatment of febrile episodes in adults cancer patients with chemotherapy-associated neutropenia of modest duration.
서울의 Penicillinase Producing Neisseria gonorrhoeae 발생빈도(1998)
김재홍,김준호,반재용,이정우,황성주,정준규,정성태,강진문,조흔정,홍창의,정혜신,이한승,김이선,이봉길,이종호,선영우,한기덕,윤성필,이성훈,안종성,박석범,문승현,조항래,김형섭,류지호,황재영,박준홍,손상욱 한양대학교 의과대학 2001 한양의대 학술지 Vol.21 No.1
In recent years, gonorrhea has been pandemic and remains one of the most common STDs in the world, especially in developing countries. For the detection of a more effective therapeutic regimen and assessing the prevalence of Penicillinase Producing Neisseria gonorrhoeae(PPNG), we have been trying to study the patients who have visited the Venereal Disease Clinic of Choong-Ku Public Health Center in Seoul since 1980 by menas of the chromogenic cephalosporin method. In 1998, 93 strians of N. genorrhoeae were isolated, among which 60(64.5%) were PPNG. The prevalence of PPNG in Seoul, which had been decreased to 39% in 1996 after a peak of 74.3% in 1993, is increased to 64.5% in 1998.
Preparation and characterization of a PtSn nanocatalyst for use in ethanol electro-oxidation.
Joo, Ji Bong,Kim, You Jung,Kim, Wooyoung,Kim, Pil,Yil, Jongheop American Scientific Publishers 2008 Journal of Nanoscience and Nanotechnology Vol.8 No.10
<P>A PtSn nanocatalyst supported on carbon (PtSn) was prepared with the enhancement of the extent of alloy degree of Pt with Sn by the heat treatment at 300 degrees C in a nitrogen atmosphere (PtSn/C-HT). The PtSn and PtSn/C-HT catalysts prepared were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and electrochemical methods, and were tested as an electro-catalyst in ethanol electro-oxidation. Results showed that the average particle size of the PtSn/C-HT was increased by the heat treatment, compared to that of PtSn. The catalytic activity of PtSn/C-HT, however, was superior in ethanol electro-oxidation. The enhanced catalytic activity of PtSn/C-HT was attributed to both the high degree of alloying in the PtSn structure and the extended Pt lattice, which promote catalytic activities in ethanol electro-oxidation and removal of intermediate CO species.</P>