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단 clone 성 항체를 이용한 정상인의 흉선세포 및 말초혈액 T-림프구의 subsets
이관호,김능수,조동규,최연극 대한내과학회 1986 대한내과학회지 Vol.30 No.4
Human thymocyte and T-cell subsets were quantitated by using OKT4 and OKT8 monoclonal antibodies in thymuses from twelve immunologically healthy children and peripheral blood from twenty healthy adults. And also, a study was done to determine whether the OKT4+T8+ lymphocytes are present in peripheral blood of healthy persons. By the expression of only OKT4 and OKT8, there were four different subsets of thymocytes as OKT4+T8+, OKT4+T8-, OKT4-T8+ and OKT4-T8- with percentages of 63.9, 10.2, 15.6 and 10.2 respectively. The OKT4+ cells and OKT8+ cells in peripheral blood T-cells of healthy persons were present in 57.7% and 31.5%, respectively. The OKT4+T8+ cells were present in 14.5% of healthy human peripheral blood T-cells.
Engineering Properties of Flowable Fills with Various Waste Materials
이관호,이병식,조경래 한국방재학회 2008 한국방재학회논문집 Vol.8 No.2
Flowable fill is generally a mixture of sand, fly ash, a small amount of cement and water. Sand is the major component of most flowable fill with waste materials. Various materials, including two waste foundry sands(WFS), an anti-corrosive waste foundry sand and natural soil, were used as a fine aggregate in this study. Natural sea sand was used for comparison. The flow behavior, hardening characteristics, and ultimate strength behavior of flowable fill were investigated. The unconfined compression test necessary to sustain walkability as the fresh flowable fill hardens was determined and the strength at 28-days appeared to correlate well with the water-to-cement ratio. The strength parameters, like cohesion and internal friction angle, were determined for the samples prepared by different curing times. The creep test for settlement potential was conducted. The data presented show that by-product foundry sand, an anti-corrosive WFS, and natural soil can be successfully used in controlled low strength materials(CLSM), and it provides similar or better properties to that of CLSM containing natural sea sand.