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메틸셀룰로오스(MC)계 증점제 혼입에 따른 3D 프린팅 콘크리트용 시멘트계 모르타르의 특성 변화에 대한 기초적 연구
김한솔 ( Kim Han-sol ),장종민 ( Jang Jong-min ),이한승 ( Lee Han-seung ) 한국건축시공학회 2019 한국건축시공학회 학술발표대회 논문집 Vol.19 No.2
Integrating 3D printing into architecture is gaining attention because it allows construction of construction structures without formwork. Among them, 3D printing construction materials must have high flow performance and at the same time ensure the performance that does not collapse during lamination. Therefore, in this study, we tried to determine the fluidity and lamination properties of mortar formulations, and set the thickener incorporation ratio as the formulation parameters. As a result of this experiment, it was confirmed that the lamination performance was secured from the thickening agent mixing rate of 1.5%.
김한솔(Han-Sol Kim),이경준(Kyung-Jun Lee),정동연(Dong-Yean Jung),이연형(Yeon-Hyeong Lee),박재현(Jea-Hyun Park),김갑순(Gab-Soon Kim) 제어로봇시스템학회 2015 제어·로봇·시스템학회 논문지 Vol.18 No.1
This paper describes the design for a defective product inspection device for the curved glass used in smart-phone. Cameras are used as inspection devices to find cracks in LCDs (Liquid Crystal Displays), PDPs (Plasma Display Panels), etc. The devices used to inspect the curved glass used in smart-phone consist of a camera, two back-light apparatus, an inspection apparatus main body, and an image processing program. Camera image calibration was performed to smooth an image taken with the camera, and as a result, the average error was less than 0.12 pixels. And the image of a smart-phone"s curved glass taken with the camera was processed using the produced program. As a result, the program could correctly extract the cracks on the curved glass. Thus, it is thought that the designed inspection device can successful detect cracks in curved tempered glass.
열량계를 이용한 고로슬래그 혼입 페이스트의 겉보기 활성화 에너지 산정에 관한 연구
김한솔 ( Kim Han-sol ),이한승 ( Lee Han-seung ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.1
It is necessary to calculate Apparent Activation Energy(Ea) in order to apply the equivalent age formula to predict compressive strength using the maturity method. For carbon reduction, it is necessary to consider the change of Ea by condition of GGBFS concrete, which is widely used today. In this study, as a basic study for the design of the compressive strength model of GGBFS concrete, the apparent activation energy of the GGBFS mixed paste was calculated through a calorimeter. The experiment was carried out at a hydration temperature of 10 to 30°C with a paste test specimen having a GGBFS content of 0 to 80%. As a result, the GGBFS replacement rate of the paste increased, and Ea tended to increase as the temperature decreased.
일대일로 구상의 변경 협력 전개: 중국 핑샹-베트남 동당 초국경 경제협력구를 중심으로
김한솔 ( Kim Han Sol ),이현태 ( Lee Hyun Tai ) 국민대학교 중국지식네트워크 2021 중국지식네트워크 Vol.17 No.-
일대일로 구상 아래 중국의 변경지역 경제협력이 어떻게 구체화되고 있는지 살필 수 있다는 점에서 중국 핑샹-베트남 동당의 초국경 경제협력구에 대한 연구는 매우 중요하다. 핑샹-동당 초국경 경제협력구는 2013년 이후 국가급 프로젝트로 승격되어 중국-베트남 간 국경무역의 핵심으로 자리매김하고 있다. 중국 정부가 매우 적극적으로 초국경 경제협력구 조성과 협력 강화에 매진하는 반면, 베트남 정부는 비교적 미온적인 태도를 보이고 있다. 양국 정부 사이의 태도 차이와 정치적 갈등에도 불구하고 초국경 경제협력구를 매개로 하는 경제협력이 지속적으로 발전하고 있다는 사실은 향후 변경지역에서의 남북 경제협력 재개 및 다자간 경제협력, 한국 기업의 해당 지역 진출 등을 구상하는 한국에 시사하는 바가 크다. Pingxiang-Dongdang is an excellent model of how China’s cross-border economic cooperation is being realized under the Belt and Road Initiative. Pingxiang-Dongdang Cross-Border Economic Cooperation Zone was promoted to a state-level project in 2013, and since have been the core of bilateral commerce between China and Vietnam. Despite all political complications, the economic cooperation between the two have been steadily improving under Cross-Border Economic Cooperation Zone. For this reason, as Korea looks to mend its economic ties with North Korea, the case of Pingxiang-Dongdang is worthwhile to look into for applicable formulas.
응결시간과 겉보기 활성화 에너지를 이용한 고로슬래그 콘크리트의 압축강도 예측에 관한 연구
김한솔 ( Kim¸ Han-sol ),양현민 ( Yang¸ Hyun-min ),이한승 ( Lee¸ Han-seung ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.2
The compressive strength of concrete is greatly affected by the temperature inside the concrete at the initial age immediately after pouring. The apparent activation energy of cement and the setting time of concrete are major factors influencing the development of compressive strength of concrete. This study measured the apparent activation energy and setting time according to the change in W/B for each mixing rate of Ground Granulated Blast-Furnace Slag (GGBFS). And after calculating the compressive strength prediction model, the accuracy of the prediction model was evaluated by comparing the predicted compressive strength and the compressive strength.