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초고성능 콘크리트 시공조인트의 전단부착성능 평가에 관한 실험적 연구
장현오,이한승 대한건축학회 2017 대한건축학회논문집 Vol.33 No.6
It is necessary to involve the characteristics and quantitative surface treatment at the same time in order to retain oneness of Ultra-High-Performance Concrete(UHPC) according to construction joint occurrence. Therefore, this study derives a reasonable surface treatment method in a material's point of view through the shear adhesion performance evaluation according to the construction joints surface processing method as a part for securing the adhesion performance of the construction joints when casting UHPC. 200 MPa of required average strength was used for mix of UHPC and surface treatment method was set to totally 6 level that MN-0, AC-0, WJ-0, GR-10, GR-20, GR-30. After the specimen were manufactured to a size of <TEX>$300{\times}640{\times}150mm$</TEX>, Push-off test was performed to evaluate the shear adhesion strength. As a results, the bonding shear performance was increased when executing a surface treatment for the construction joint interface. As the increases in length of grooves every 10 mm, the bonding shear performance increased about 2.3 times. In this study, it is judged that 30 mm of groove length would have had an advantage for securing the monolithic of concrete. Also, the interface of cross section and the number of grooves should be considered to increasing in the bonding shear performance of concrete.
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장현오 한국미술교과교육학회 1996 師鄕美術敎育論叢 Vol.4 No.-
요즘 들어 교과 교육학에 대한 관심이 높아지고 있으나 미술교육학에 대한 연구는 주지교과나 다른 예체능 교과에 대한 연구에 비해 뒤지고 있는 편이다. 그 이유는 미술이 다른 교과들처럼 보편성이나 일반성을 추구하기 보다는 창조성과 다양성을 추구하고, 학습자 내면의 표현을 다루는 교과이기 때문이라고 할 수 있다. 따라서 미술교육학을 정립하기 위해서 교과교육학 측면에서 접근할 것이며, 먼저 교과교육학의 학문적 성격을 살펴보고 그에 따른 학문으로서 미술교육학의 위치와 현황을 살펴볼 것이다.
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청소년기 비만아에서 이상 혈청 간효소치 및 총콜레스테롤치의 유병율
장현오,이종국,강윤주,Jang, Hyun Oh,Lee, Chong Guk,Kang, Yun Ju 대한소아청소년과학회 2002 Clinical and Experimental Pediatrics (CEP) Vol.45 No.12
Purpose : The purpose of this study was to look at prevalences of abnormal serum aminotransferase levels and abnormal serum total cholesterol levels among adolescents with obesity in Seoul area. Methods : Body mass index[$BMI(kg/m^2)$], serum aspartate aminotransferase(AST) alanine aminotransferase( ALT), and total cholesterol levels were measured in 26,876 adolescents(male : 13,287, female : 13,589) of first grade of high school in Seoul between the ages of 15 and 16 years, enrolled in a large health examination survey by Seoul School Health Center(SSHC) in 2001. Obesity was defined as BMI more than 95th percentile for age and sex and normal weight was defined as BMI between 25th percentile and 75th percentile for age and sex. Abnormal levels of AST, ALT and total cholesterol were defined as more than 95th percentile for age and sex. Results : The BMI at 95th percentile was 28.7 in males and 26.9 in females. The prevalence of abnormal AST levels was higher in obesity group than in normal weight group. In males, those were 23.7% and 3.7%, respectively(P<0.01, $x^2-value$ : 529.2). In females, those were 11.8% and 4.9 %, respectively(P<0.01, $x^2-value$ : 56.3). The prevalence of abnormal ALT levels was significantly higher in the obesity group compared with the normal weight group. In males, those were 33.9% and 1.7%, respectively(P<0.01, $x^2-value$ : 1,693.4). In females, those were 22.3% and 3.9%, repectively(P<0.01, $x^2-value$ : 397.6). The prevalence of abnormal total cholesterol levels was higher in the obesity group than in the normal weight group. In males, those were 16.8% and 3.5%, respectively(P<0.01, $x^2-value$ : 268.3). In females, those were 9.0% and 5.4%, respectively(P<0.01, $x^2-value$ : 14.2). Conclusion : This study revealed that the prevalences of abnormal AST, ALT and total cholesterol level were higher in the obese group than in the normal weight group.
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장현오,김영균,오세욱,박용원,이홍섭 인제대학교 2000 仁濟醫學 Vol.21 No.2
Congenital coronary artery fistulas are very rare, but by widespread use of echocardiogram and selective coronary angiogram, have been recognized with increasing frequency. Most congenital coronary artery fistulas drain into the right heart chambers or pulmonary arteries, but there are rare instances in which the fistulas drain into the left heart. The symptoms seen in the congenital coronary artery fistula include angina, dyspnea and palpitation. A number of patients with congenital coronary artery fistula are asymptomatic. Coronary artery fistulas are amenable to surgical correction. Early treatment, especially in the asymptomatic young patient, can prevent the appearance of later symptoms or complications. Definitive diagnosis relies on cardiac catheterization, but diagnostic sensitivity and safety of echocardiography in detecting abnormal coronary artery connection are high in high risk young patients. We experienced 4 cases of surgically corrected coronary artery fistula in asymptomatic pediatric patients. So we report 4 cases of coronary artery fistula with brief review of literature.
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초음파상 지방간과 간기능검사(ALT, AST, r-GTP)와의 상관관계
장현오,김도형 대한초음파의료영상학회 2011 대한초음파의료영상학회지 Vol.2 No.1
목적 : 우리나라는 급속한 경제성장과 생활수준의 향상으로 평균수명 연장과 생활양식의 변화가 일어나고 있다. 과거와는 다른 식생활습관 및 음주량의 증가 등에 의해 고칼로리, 고지방식의 음식을 섭취하고 있어 지방간이 증가하는 추세이다. 대상 및 방법 : 2010년 1월부터 9월까지 한국건강관리협회 대구광역시지부에서 건진 항목으로 상복부초음파검사와 혈액검사(ALT, AST, γ-GTP)를 함께 받은 총 4,027명 중 남자 1,926명, 여자 2,101명을 대상으로 하였다. 결과 :1. X2-Test를 한 결과 남자가 비정상군이 여자보다 많이 분포 하였고, 연령별에서는 60대가 가장 높은 비율을 차지하였다. 지방간 정도와의 관련성에서도 성별, 연령별 모두 통계적으로 유의한 차이가 있었다. 2. BMI, AST, ALT, γ-GTP 모두 정상, 경도, 중등도, 고도 순으로 높아져서 매우 유의한 평균차이가 있었다. 3. 여성보다 남성이, 연령이 증가 할수록 지방간 정도의 증가가 있었다. BMI와 초음파결과와는 초음파 지방간 정도의 증가가 있었으나 통계적으로 유의하지 않았다. AST, ALT, γ-GTP가 증가할수록 지방간 정도가 증가하였다. 결론 : 초음파상 지방간의 정도가 간기능 검사결과와 매우 유의한 상관관계를 갖고 있음을 알 수 있었고, 향후에도 지방간과 간기능검사와의 관련성에 대한 추적조사가 필요하다고 사려된다.
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