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모르타르 충전식 스플라이스 슬리브의 부착성능에 관한 연구
조승진,안병익,김형기,박복만 明知大學校 産業技術硏究所 2002 産業技術硏究所論文集 Vol.21 No.-
The mechanical joint method is expected to take an important part in the P.C. construction methods. Grout-filled splice sleeve system is used for connecting reinforced concrete column to column and wall to wall in the construction field. This is an experimental study to clarify the bond capacity to be generated between mortar(660kgf/cm2-803kgf/cm2) and reinforcing bar in the grout-filled splice sleeve system. The developed length in the splice sleeve is 4.2d~6.2d Following main conclusions are obtained: (1) Grout-filled splice sleeve system satisfies the structural performance. (2) When comparing the experiment result with existing sleeve design formula on the bond capacity, existing formula is rather safer, but it is considered necessary to present more exact sleeve formula through more close experiment.
한국인 정신분열병과 5-HT_2A Receptor Gene Promoter 다형성(-1438A/G)과의 관련연구
조현,지익성,손정우,이영호 大韓神經精神醫學會 2001 신경정신의학 Vol.40 No.2
연구목적: 최근 세로토린 체계가 정신분열병과 관련이 있는 것으로 여겨지면서 5-HT2A 수용체 유전자와 promoter 부위의 다형성과 정신분열병과의 관련성이 연구되고 있다. 본 연구는 5-HT2A 수용체 유전자 promoter - 1438A/G 다형성이 한국인 정신분열병과 관련성이 있는지를 알아보기 위해 시행되었다. 방법: 한국인 정신분열병 환자 132명과 정상대조군 138명을 대상으로 중합효소 연쇄반응을 이용하여, 5HT2A 수용체 유전자 promoter - 1438A/G 다형성의 유전자형과 대립유전자의 빈도를 비교하였다. 결과: - 1438A/G의 대립유전자의 빈도에서는 양군간에 유의한 차이가 없었다(χ²=2.261, df=1, p=0. 133). 유전자형은 양군간에 미약하게 유의한 차이가 있었는데(χ²=6.157, df=2, p=0.046) 이는 양군간에 유전자형 G/G은 차이가 없고, 정신분열병군에서는 A/G, 정상인군에서는 A/A가 많은 결과로 판단되었다(A/A : AG+G/G, χ²=5.880, df=1, p=0.015 : A/A+A/G : G/G, χ²=0.049, df=1, p=0.826). 결론: 5-HT2A 수용체 유전자의 promoter -1438A/G 다형성이 한국인의 정신분열병의 발병과는 관련이 없는 것으로 보인다. Objectives: This study was desinged to investigate the association between 5-HT2A receptor gene promoter -1438A/G polymorphism and schizophrenia in a Korean population. Method: 5-HT2A receptor gene promoter -1438A/G polymorphism was typed with Poly- merase Chain Reaction in 132 patients with schizophrenia and 138 healthy normal controls. Results: There was no difference in allelic frequency of - 1438A/G polymorphism between patients with schizophrenia and controls(χ²=2.261, df=1, p=0.133). A difference was found in genotype distribution (χ²=6.157, df=2, p=0.046), but this difference was being given by the increased A/A in the controls and A/G in the patients. The genotype frequency, which is the sum of homozygosity and heterozygosity for the -1438 G allele, was significantly higher in the patients(χ²=5.880, df=1, p=0.015). However, there was no difference between the patients with schiophrenia and conrols in the frequency of homozygosity for the -1438 Gallele. Conclusions: These results suggest that -1438A/G polymorphism of the 5-HT2A receptor gene promoter is not causally related to the development of schizophrenia in a Korean population.
한국 주요정신장애의 유병률 및 관련요인 : 2006 전국정신질환역학조사
조맹제,장성만,함봉진,정인원,배안,이영문,안준호,원승희,손정우,홍진표,배재남,이동우,조성진,박종익,이준영,김진영,전홍진,이해우 大韓神經精神醫學會 2009 신경정신의학 Vol.48 No.3
Objectives The aims of this study are to estimate the prevalence of the DSM-IV psychiatric disorders in the Korean population using the Korean version of Composite International Diagnostic Interview (K-CIDI), and to compare those with previous studies. Methods The Korean Epidemiologic Catchment Area study Replication (KECA-R) was Conducted between August 2006 and April 2007. The sampling of the subjects was carried out across 12 catchment areas. A multistage, cluster sampling design was adopted. The target Population included all eligible residents aged 181o 64 years. Face-to-face interviews were conducted with the Korean version of Composite International Diagnostic Interview (K-CIDI) based on the DSM-IV (N=6,510, response rate=81.7%). Results A total of 6,510 participants completed the interview. The lifetime and 12-month prevalence rates for all types of DSM-IV disorders were 30.0% and 17.3%, respectively. Those of Specific disorders were as follows : 1) alcohol use disorder, 16.2% and 5.6% ; 2) nicotine use disorder, 9.0% and 6.0% ; 3) specific phobia, 3.8% and 3.4% ; 4) major depressive disorder, 5.6% and 2.5% ; and 5) generalized anxiety disorder, 1.6% and 0.8%. Data relating to nicotine and alcohol use disorder revealed a very high male/female ratio. Mood disorder and anxiety disorder were more prevalent among females than males. Conclusion The prevalence of psychiatric disorders was high. In comparison with other studies, remarkable differences in the distribution of psychiatric disorders across the country and times were observed.
지익성,조현 충남대학교 의과대학 지역사회의학연구소 1999 충남의대잡지 Vol.26 No.1
Clozapine, an atypical antipsychotic drug, is widely used in treatment-resistant schizophrenia. In addition to agranulocytosis, an increased susceptibility to epileptic seizures during clozapine treatment has previously been described. The authors describe 2 patients who developed epileptic seizure during clozapine treatment and provide recommendation for clinical management of this problem.
Co(Ⅲ)/Co(Ⅱ) 및 Fe(Ⅲ)/Fe(Ⅱ) 산화환원계에 의한 폴리에틸렌글리콜류의 매개전해산화
김익성,박정훈,박승조 동아대학교 환경문제연구소 2006 硏究報告 Vol.28 No.1
Mediated electrochemical oxidation (MEO) is an aqueous process which oxidizes organics electrochemically at low temperatures and ambient pressures. The process can be used to treat mixed wastes containing hazardous organics. This paper has studied MEO of polyethylene glycols (PEGs) in nitric acids by Fe/Fe(Ⅱ) and Co/Co(Ⅱ) system. It is investigated current density, supporting electrolyte concentration, hydraulic retention time, removal efficiency by PEGs continuous MEO. Removal efficiency of PEGs, electrical charge and reaction time by mediated electrochemical oxidation was excellent in Co/Co(Ⅱ) redox system than Fe/Fe(Ⅱ) redox system, indicating mediated electrochemical oxidation removal efficiency was 100 percent.
유도초음파를 이용한 2.25Cr-1Mo재의 열화도 평가
박익근,박은수,이상용,권숙인,조윤호,윤승현 한국비파괴검사학회 2001 한국비파괴검사학회지 Vol.21 No.4
고온에서 장시간 사용으로 인하여 발생되는 경년열화 평가에는 파괴적인 방법이 신뢰성이 높지만 시험편 채취의 어려움이 있다. 그러므로 비파괴적인 방법에 의한 열화도 평가가 바람직하다. 본 연구에서는 2.25Cr-1Mo강에 대하여 장시간 등온열처리로 모의 열화시험편을 제작하여 고온설비부재에서 발생되는 탄화물의 석출 및 조대화, 불순물의 입계편석 등 금속학적 미세조직을 관찰하고, 미세조직의 변화와 유도 초음파의 전파특성과의 상관관계를 규명하고, 파괴시험치와 그 결과를 비교하여 초음파 비파괴평가에 의한 고온부재의 열화도 평가의 가능성을 실험적으로 검증하고자 한다. The destructive method is reliable and widely used for the estimation of material degradation but, it have time-consuming and a great difficulty in preparing specimens from in-service industrial facilities. Therefore, the etimation of degraded structural materials by nondestructive evaluation is strongly desired. In this paper, the use of guided wave was suggested for the evaluation of thermally damaged 2.25Cr-1Mo steel as an alternative way to compensate for limitations of fracture tests. The observation of microstructure variations of the material including carbide precipitation increase and spheroidization near gain boundary was conducted and the correlation with the guided wave features such as energy loss ratio and group velocity changes was investigated. Through this study the feasibility of ultrasonic guided wave evaluation for thermally damaged materials was explored.