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유한요소법에 의한 탄소섬유시트와 콘크리트의 부착특성 해석
송성용 ( Song Sung-yong ),金刀督純 ( Kanetoh Masayoshi ),최근도 ( Choi Kun-do ),이한승 ( Lee Han-seung ),유영찬 ( Rui Young-chan ),이리형 ( Lee Ri-hyung ) 한국구조물진단유지관리공학회 2001 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.5 No.2
The effect of reinforced concrete member strengthened with carbon fiber sheet(CFS) is relied on bond property between CFS and concrete. In order to investigate the influence of bond failure, this study is carried out tensile-shear analysis by unite element method. When the bond shear stress is 24kgf/㎠, analysis results become well. It is concluded that the effective bond length is 20cm. The crack load and bond failure load is made clear by bond shear stress.
한국 정신분열병 환자에서의 혈중 Homocysteine, 엽산, Vitamin B12 농도 비교연구
김태호,이영식,송성용,민경준,기백석,나철,채석래,Kim, Tae Ho,Lee, Young Sik,Song, Seong Yong,Min, Kyung Joon,Kee, Baik Seok,Na, Chul,Chae, Seok Lae 대한생물정신의학회 2004 생물정신의학 Vol.11 No.2
Objective:There have been a kind of transmethylation theory that high homocysteine serum concentration affects schizophrenia by neurotoxic mechanism and clinical reports that some schizophrenic patients with high homocysteine were improved by high folate ingestion. This study was done to confirm previous research results and find the clinical characteristics of schizophrenia showing high serum homocysteine and low folate. Method:We compared the serum levels of homocysteine, folate and vitamin B12 level between 234 schizophrenic patients(male 99, female 135) group and 234 normal controls(male 99, female 135) group. The subjects of two groups were age and sex matched. The evaluated clinical characteristics items were sex, age, onset of disease, hereditary loading, disease course, hallucination and subtype of schizophrenia. Results:1) Homocysteine level of the schizophrenia group was significantly higher than the normal control group and folate level of the schizophrenia group was significantly lower than the normal control group. Homocysteine level was more negatively correlated with folate level in the schizophrenia group than the normal control group. 2) The percentage of high homocysteine(above 12.46umol/L;90 percentile of normal control) was 33.8% of schizophrenia patients and 51.5% of male schizophrenia. The percentage of low folate(below 3.8nM/L;bottom tertile of normal control) was 66.2% of schizophrenia. 3) In low folate group and not-low folate group, schizophrenia showed significantly higher homocysteine level than normal control. Especially, low folate schizophrenia group showed significantly higher homocysteine level than low folate normal control group. Conclusions:Some schizophrenia patients with high serum homocysteine may be genetic defector and having low folate serum level. In that case, folate ingestion could be a good management for clinical improvement.