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설계기준강도 100MPa급 초고강도 콘크리트의기초물성에 관한 실험적 연구
공민호,정상진,양동일 한국건축시공학회 2006 한국건축시공학회지 Vol.6 No.3
In these days, as building structures are getting taller, larger, and more diversified, structural systems with more economy and more efficiency are being required and so are more efficient building materials. this study conducted a basic experiment to conclude an adequate selection of materials and to calculate an optimal mixing proportion of those materials to produce High-strength concrete in a 100MPa of specified concrete strength. And also we conducted an experiment to find out basic properties of this concrete such as slump-flow, strength.
초기 고온이력을 받은 시멘트 모르터의 압축강도 특생에 관한 실험적 연구
공민호,정상진 단국대 부설 리모델링연구소 2006 리모델링 연구소 논문집 Vol.4 No.2
This study is basic experiment for estimating influence of strength by curing temperature of concrete's heat of hydration and estimate relationship of compressivε strength development by initial curing temperature factor, and then asume temperature factor which influence compressive strength development and for showing basic document of quality control. According to the result of cement mortar by the curing temperature factor high-curing temperature shows high strength on 3 day compare with low curing-temperature, shows higher strength than the piece of high curing temperature.
Relationship of Facet Tropism with Degeneration and Stability of Functional Spinal Unit
공민호,Wubing He,Yu-Duan Tsai,Nan-Fu Chen,Gun Keorochana,Duc H. Do,Jeffrey C. Wang 연세대학교의과대학 2009 Yonsei medical journal Vol.50 No.5
Purpose: The authors investigated the effect of lumbar facet tropism (FT) on intervertebral disc degeneration (DD), facet joint degeneration (FJD), and segmental translational motion. Materials and Methods: Using kinetic MRI (KMRI), lumbar FT, which was defined as a difference in symmetry of more than 7O between the orientations of the facet joints, was investigated in 900 functional spinal units (300 subjects) in flexion, neutral, and extension postures. Each segment at L3-L4, L4-L5, and L5-S1 was assessed based on the extent of DD (grade I-V) and FJD (grade 1- 4). According to the presence of FT, they were classified into two groups; one with FT and one with facet symmetry. For each group, demographics, DD, FJD and translational segmental motion were compared. Results: The incidence of FT was 34.5% at L3-L4, 35.1% at L4-L5, and 35.2% at L5-S1. Age and gender did not show any significant relationship with FT. Additionally, no correlation was observed between DD and FT. FT, however, wasfound to be associated with a higher incidence of highly degenerated facet joints at L4-L5 when compared to patients without FT (p < 0.01). Finally, FT was not observed to have any effects upon translational segmental motion. Conclusion: No significant correlation was observed between lumbar FT and DD or translational segmental motion. However, FT was shown to be associated significantly with the presence of high grades of FJD at L4-L5. This suggests that at active sites of segmental motion, FT may predispose to the development of facet joint degeneration.
고강도 매스 콘크리트의 압축강도 관리에 관한 연구 : 단열양생법을 중심으로
공민호,정상진 단국대 부설 리모델링연구소 2006 리모델링 연구소 논문집 Vol.4 No.1
Because of building higher story and larger buildings, and because current concrete, a basic construction material, needs higher strength rather than normal strength, the use of high-strength concrete becomes more widely spread. High-strength concrete shows very high temperature increase due to inside heat of hydration different from normal-strength concrete, and because mass concrete under low temperature shows temperature stress due to temperature difference between inner and outer parts, it is known or reported that there is a significant difference between the compressive strength of srtucture and that of specimen for management, and between the compressivestrength of circular specimen made by standard underwater curing and structure concrete Therefore, in this research, an adiabatic curing box was manufactured which can provide hydration heat hysteresis of high strength mass concrete members and similar hydration heat hysteresis, using insulating materials, as a easy and exact method to manage compressive strength of rnass concrete member under low temperature, and the features of concrete member and those of specimen for management were compared.
초기 고온이력을 받은 시멘트 모르터의 압축강도 특성에 관한 실험적 연구
공민호,정상진 대한건축학회 2006 大韓建築學會論文集 : 構造系 Vol.22 No.3
This study is basic experiment for estimating influence of strength by curing temperature of concrete's heat of hydration and estimate relationship of compressive strength development by initial curing temperature factor, and then asume temperature factor which influence compressive strength development and for showing basic document of quality control. According to the result of cement mortar by the curing temperature factor high-curing temperature shows high strength on 3 day compare with low curing-temperature, shows higher strength than the piece of high curing temperature.