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장영재(Jang, Young-Jae),박철우(Park, Cheol-Woo),김승원(Kim, Seung-Won),정우태(Jung, Woo-Tae),박영환(Park, Young-Hwan) 한국구조물진단유지관리학회 2011 한국구조물진단학회 학술발표회논문집 Vol.15 No.1
This study investigates fracture toughness of fiber reinforce lean concrete. Lean concrete base for multifunctional composite pavement system requires higher fracture toughness. Once a crack initiates higher fracture toughness will absorb greater energy and hence effectively control crack growth. ASTM C-1018 method was employed with Japanese yoke. Total of 7 different fiber variables were considered. Also 10% replacement of cement by fly ash was included as a variable. It was found that steel fiber was effective in increasing the fracture tougness.
튜토리얼 : 빅데이터, 비즈니스 애널리틱스, IoT: 경영의 새로운 도전과 기회
장영재 ( Young Jae Jang ) 한국정보시스템학회 2015 情報시스템硏究 Vol.24 No.4
With the advancement of the Internet/IT technologies and the increased computation power, massive data can be collected, stored, and processed these days. The availability of large databases has brought forth a new era in which companies are hard pressed to find innovative ways to utilize immense amounts of data at their disposal. Indeed, data has opened a new age of business operations and management. There are already many cases of innovative businesses reaping success thanks to scientific decisions based on data analysis and mathematical algorithms. Big Data is a new paradigm in itself. In this article, Big Data is viewed as a new perspective rather than a new technology. This value centric definition of Big Data provides a new insight and opportunities. Moreover, the Business Analytics, which is the framework of creating tangible results in management, is introduced. Then the Internet of Things (IoT), another innovative concept of data collection and networking, is presented and how this new concept can be interpreted with Big Data in terms of the value centric perspective. The challenges and opportunities with these new concepts are also discussed.
장영재 ( Jang Young Jae ),주형석 ( Ju Hyeong Seok ),오달수 ( Oh Dal Soo ),임윤식 ( Lim Yoon Sik ),유동우 ( You Dong Woo ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.1
This study is to investigate and analyze the correlation of carbonation according to strength of concrete members for bridge in marine enviroment. Also depth of carbonation according to age for 100 years is estimated by carbonation rate coefficient. As a result of the measurement, it was found that the depth of carbonation decreases with increasing strength. This is because it is considered that water-cement ratio and amount of unit cement are influenced by the concrete mixing. Also, It is anticipated that rebar corrosion due to carbonation will not occur in concrete members.