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계란껍질 분말을 혼입한 시멘트 페이스트의 역학 특석 및 CO<sub>2</sub> 배출량 연구
진옥곤 ( Chen¸ Yukun ),이한승 ( Lee¸ Hanseung ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.2
This study investigated the use of different amounts of eggshell powder (ESP), namely 5%, 10%, and 15% by weight, as a substitute for Ordinary Portland Cement. The results show that its flowability and 28-day compressive strength. Meanwhile the carbon dioxide emission was though sustainable assessment analyzed It was concluded that ESP replacement level of around 5% provides the best performance to reduces environmental pollution.
고로 슬래그 및 POFA 함유 눅색 삼원 시멘트 페이스트의 역학적 특성 연구
진옥곤 ( Chen Yukun ),이한승 ( Lee Hanseung ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.1
This study investigated the use of different amounts of BFS and POFA. In all mixture systems, 60% cement was replaced with POFA and BFS as a substitute for Ordinary Portland Cement. The results show that with the addition of POFA and BFS, although the early compressive strength will be reduced, the strength will be significantly improved at 28 days. In the ternary system, the 28-day strength is negatively correlated with increasing POFA content.
계란껍질 분말을 혼입한 시멘트 페이스트의 수화 특성에 관한 실험적 연구
진옥곤 ( Chen Yukun ),순양 ( Sun Yang ),이한승 ( Lee Han-seung ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.1
The eggshell is a type of bio-waste which is considered hazardous to the environment. In this research, the waste eggshell is utilized as a potential filler in cementitious material. This study has measured by zeta potential to analyze the interaction between the surface of the filler and the calcium ion in the solution. Meanwhile, the effect of eggshell powder on cement hydration process has been determined by isothermal calorimeter. The results show that the surface of eggshell powder have a strong adsorption of Ca2+, and addition of the eggshell powder provides a heterogeneous nucleation site for cement, which promotes the growth of hydration products.
이석준(Seogjun Lee),함유근(Yukun Hahm) 건국대학교 경제경영연구소 2003 商經硏究 Vol.28 No.2
Over the past couple of years, the procurement management function has become the core part of the e-Government activites in Korea. The Korean government initiated the e-Govermment projects to provide a better service thorough more efficient givernment administration. One of the core e-government project was an e-procurement service using the government e-procurement system. The e-procurenment service project has been so successful that the Korean Public Procurement Service (PPS) was awarded UN Public Service Award in 2003. It is expected that Korean government agencies will save large amount of money by implementing the e-procurement systems for public purchases. This paper provides a case study of the Korean Public Procurement Service’s e-procurement service. The case study is based on Information strategic planning for the Korean government’s e-procurement service project, and includes definition of government e-procurement service, in-depth analysis on government procurement service and processes, identification of procurement-related organizations, the Korean government’s e-procurenment vision/strategy, and the expected benefits from the government e-procurement service project.
Co-word 분석법을 통한 디지털금융 연구의 프레임워크 도출
김미현(Mihyun Kim),함유근(Yukun Hahm),이우형(Woohyoung Lee),김용재(Yongjae Kim) 한국인터넷전자상거래학회 2011 인터넷전자상거래연구 Vol.11 No.1
The evolution of information and communication technology is continued, and, financial services are becoming more dependent on digitalized information and tools. Simply speaking, digital finance refers to developing and delivering financial services digitally. However, the research scope of digital finance is still at a young age. This empirical research demonstrates the effectiveness of content analysis to map the research literature of the digital finance to identify the boundaries of digital finance research. Co-word analysis is the specific technique used. This methodology identifies associations among publication descriptors (indexing terms) from the Social Sciences Citation Index(SSCI) and produces networks of descriptors that reveal these underlying patterns. The results suggest six research themes in digital finance as new technologies emerge and customers’ experience on digital financial services grow.