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장영일,이병재,박승범 한국구조물진단유지관리학회 2011 한국구조물진단학회 학술발표회논문집 Vol.2011 No.9
River management has been worked by domestic river management plan and natural small river arrangement works after 1990s. However, retaining wall and porous embankment block contain environmental damage and structural problems. Therefore, arranged structures and damage cases were investigated in this study.
장영일(Young Il Jang),이상준(Sang Joon Lee) 한국가시화정보학회 2008 한국가시화정보학회 학술발표대회 논문집 Vol.- No.2
The POD modal characteristics of the turbulent wake in the cross-sectional planes behind a sphere at Re=11,000 were analyzed with the POD eigenvalues and modal velocity vector fields. The relative contribution of the POD mode 1, 2 and 3 in eigenvalues was 26, 11, and 8 %, respectively. Velocity vector fields of the POD mode 1 at x/d=0.7~1.4 showed similar pattern with those of time-averaged velocity fields. On the other hand, the sphere wake in the region from x/d=1.5 to x/d=2.0 showed the directional variation of flow pattern at sequential x/d locations. This implies that the wavy pattern was the dominant coherent structure of the sphere wake. From the POD mode 2, the conspicuous foci, saddle and node points appeared irregularly at each downstream locations. The unique distribution patterns including the large-scale circulatory vortex in the POD modes were not observed in instantaneous or time-averaged mean velocity fields. The POD decomposition was useful in identifying obscured coherent structures.
개질 유화아스팔트를 혼입한 Slurry Seal 재료의 강도 특성
장영일 ( Jang Young-il ),공준호 ( Gong Jun-ho ),배준영 ( Bae Jun-young ),김선우 ( Kim Sun-woo ),박완신 ( Park Wan-shin ) 한국구조물진단유지관리공학회 2020 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.24 No.2
본 연구에서는 나노 TiO<sub>2</sub> 담체를 혼입한 Slurry Seal 재료를 개발하기 위한 기초실험으로 개질 유화아스팔트를 혼입하여 강도시험용 공시체를 제작하였다. 개질 유화아스팔트와 시멘트를 혼입하여 제작된 Slurry Seal의 역학적 특성을 분석하여, 향후 도로 보수용 아스팔트 재료 개발에 기초 연구로 활용하고자 한다. 실험결과, 물의 양을 전체 재료의 12% 혼입할 경우 Slurry Seal의 재료분리 없는 유동성을 확보하고 압축강도 또한 가장 우수한 성능을 나타내는 것으로 확인되었다.
MWNT를 지지체로 한 고성능 나노 TiO2 담체의 특성
장영일 ( Jang Young Il ),이종원 ( Lee Jong Won ),배준영 ( Bae Jun Young ),박완신 ( Park Wan-shin ),김선우 ( Kim Sun Woo ) 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.21 No.1
The purpose of this experimental study is to investigate the application of materials of construction with MWNT and TiO2. high performance nano MWNT-TiO2 carrier was fabricated by sol-gel method and performance analyzed by XRD and SEM. As a result, high performance nano MWNT-TiO2 carrier was no significant differences in coating state, crystallinity and microstructure.