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일정축력 및 반복 횡하중을 받는 철골철근콘크리트 기둥의 내력과 변형성능
정수영,연길환,임경택,윤석천,한병찬 忠南大學校 産業技術硏究所 1995 산업기술연구논문집 Vol.10 No.2
An experimental investigation was conducted to investigate the strength and deformation capacity of Wide Flange Steel Encased Reinforced Concrete(SRC) Columns subjected to constant axial compression and cyclic lateral loading conditions. Six one-third scale specimens were tested, each consisting of a structural steel size encased in reinforced concrete. The parameters studied in the test program included the effects of B/t ratios of encased steel(=13, 18, 23), ratios of axial force(=1/3, 1/6). As a result, capacity prediction based on superimposing the moment-axial-load interaction surfaces of the steel shape and reinforced concrete produced good results; the average of the experimental-to-predicted capacity ratio being equal to 0.99∼1.20. The observed hysteretic behavior of the test specimens indicated that adequated ductility can be achieved and the concrete core must be inhibited to buckling of wide flange.
전단보강근량에 따른 초고강도 콘크리트를 사용한 고층형 내력벽의 이력거동
윤현도,연길환,정수영,윤석천,이창갑 忠南大學校 産業技術硏究所 1995 산업기술연구논문집 Vol.10 No.1
Three one fourth scale models using ultra high-strength concrete(f' =704 kg/㎠) are tested under the combined action of a constant axial and a horizontal load cyclically to failure. Such specimens are considered to represent the critical 3-story of low part in 60-story tall building of a structural wall system in area of high seismicity. The amount of vertical reinforcement and the level of applied axial stress are identical for the three wall tested. The cross-section of all walls is barbell shape. The aspect ratio(h /l ) of test specimen is 1.8. The primary objectives of this paper are to investigate the influence of the amount of horizontal reinforcement on the lateral resistance, failure mechanism, ductility and energy-dissipation capability of walls with ultra high-strength concrete. In contrast to what is widely believed, the horizontal web reinforcement does not appear to have a significant effect on shear capacity. Certainly, since the reduction of the web horizontal reinforcement to almost half the value specified by building codes doesn't affect the failure load, this effect in not accounted for by the truss analogy concept. The results obtained have helped to identify the causes of wall failure and have demonstrated that the concepts underlying current ACI Building Code provisions for the design of walls conflict with the observed structural behavior. It has been found that shear resistance is associated with triaxial compressive stress conditions that develop in the compressive zone of the section at the base of the wall.
혼합형 자가면역성용혈성빈혈과 동반된 Evans 증후군 1례
선길홍,윤찬영,박상곤,박경희,우정주,한경택,김진화,김영훈,정춘해,박치영 朝鮮大學校 附設 醫學硏究所 2005 The Medical Journal of Chosun University Vol.30 No.2
Evans syndrome is defined as a simultaneous or sequential occurrence of autoimmune hemolytic anemia and autoimmune thrombocytopenia. Autoimmune hemolytic anemia (AIHA) is usually induced by IgG warm autoantibody or cold-active IgM antibodies reacting specifically with antigens associated with a patient's RBC. AIHA is a fairly uncommon disorder, with estimates of the incidence at 1 to 3 cases per 100,000 per year. Mixed-type AIHA is a relatively uncommon form of AIHA, with studies noting the incidence of 7-8% among cases of AIHA. We experienced a patient, 46-year-old woman who was diagnosed having a very rare clinical presentation of mixed warm and cold antibody mediated Evans syndrome. She was treated with corticosteroid therapy only and has been maintaining a complete response for 15 weeks. 저자들은 혼합형의 자가면역성 용혈성 빈혈과 자가면역성 혈소판 감소증이 동시에 발생한 혼합형 Evans 증후군으로 진단하고 스테로이드 요법 후 혈액학적으로 회복된 상태로 15주가 지난 현재 steroid 5 mg/일 까지 감량한 상태에서 추적 관찰 치료중인 46세 여자 환자를 경험하였기에 문헌 고찰과 함께 보고하는 바이다.
동일한 시료에 대한 국내 기관간의 STR 분석결과 비교 : STR 유전자좌 분석법의 표준화 설정을 위하여
박종태,신경진,양윤석,우광만,이숭덕,이승환,이정빈,정연보,조승희,한길로,한면수,홍승범 大韓法醫學會 2001 대한법의학회지 Vol.25 No.1
This paper described a collaborative exercise intended to see what kinds of short tandem repeat (STR) loci are used in different DNA typing laboratories in Korea and to compare their results for the demonstration whether uniformity of DNA profiling results from different laboratory could be achieved in Korea Laboratories were asked to test five tissue DNAs using methods routinely used in each laboratory and to report the results to the coordinating laboratory. The exercise demonstrated that each laboratory was using different STR loci for the typing with different STR numbers,2 VNTRS,36 STRs and amelogenin in total, and the direct comparison of the results from all the laboratory for the 18 loci could not be done as only one laboratory submitted typing results. Among 21 loci for which several laboratories submitted typing results, results for 14 loci were the same and results for the other 7 loci were different depending on the participating laboratory. D1S80, F13A01, D16S539, D21S11, D18S51, D3S1744 were the loci with different typing results. Even in the cases where commercial kits were used, the results were not the same depending on the machines used, that is the capillary electrophoresis or the gel based electrophoresis. The reason for the different results, points about the standardization of the methods arid the profiling data were described.
Chemically and thermo-mechanically stable LSM–YSZ segmented oxygen permeable ceramic membrane
Yun, Kyong Sik,Yoo, Chung-Yul,Yoon, Soon-Gil,Yu, Ji Haeng,Joo, Jong Hoon Elsevier 2015 Journal of membrane science Vol.486 No.-
<P><B>Abstract</B></P> <P>In this study, a dual-phase oxygen permeable membrane based on a segmented structure of yttria stabilized zirconia (YSZ) and strontium-doped lanthanum manganite (LSM) was developed using a tape casting technique. Oxygen flux was significantly increased in the segmented membrane by a significant reduction in reactions between the YSZ and LSM. The segmented membrane also exhibited stable oxygen flux in the presence of both CO<SUB>2</SUB> and H<SUB>2</SUB>O, as well as against thermal stress. This chemically and thermo-mechanically stable YSZ based segmented membrane is proposed for real application in oxygen production.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A dual-phase oxygen membrane based on a segmented structure is proposed. </LI> <LI> Oxygen flux is significantly increased in the segmented membrane. </LI> <LI> This structure reduces the reaction between the YSZ and LSM. </LI> <LI> The membrane exhibits stable oxygen flux in the presence of both CO<SUB>2</SUB> and H<SUB>2</SUB>O. </LI> </UL> </P>