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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.
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.
김한솔(Han Sol Kim),주영훈(Young Hoon Joo),박진배(Jin Bae Park) 한국지능시스템학회 2012 한국지능시스템학회논문지 Vol.22 No.4
본 논문에서는 선도 로봇을 추종하는 군집 로봇의 대형 제어를 인공 포텐셜 장을 사용하여 제안한다. 또한, 인공 포텐셜 장은 물리적으로 해석하기 쉬운 전기장을 모델링하여 구성하고, 장애물을 더욱 효과적으로 모델링하기 위해서, 장애물의 모양에 따라 전기장의식을 달리한다. 제안하는 방법은 선도 로봇의 경로를 인공 포텐셜 장을 통해 계획한 뒤, 선도 로봇을 추종 로봇이 뒤따라가는 형태로 구성된다. 마지막으로 시뮬레이션 예제를 통해 제안하는 기법의 타당성을 검증한다. In this paper, artificial potential field(APF) is applied to formation control for the leader-following swarm robot. Furthermore, APF is constructed by applying the electrical field model. Moreover, to model the obstacle effectively, each obstacle has different form due to the electrical field equation. The proposed method is formed as two sub-ojective: path planning for the leader-robot and following-robots following the leader-robot. Finally, simulation example is given to prove the validity of proposed method.
김한솔(Han-Sol Kim),이경준(Kyung-Jun Lee),정동연(Dong-Yean Jung),이연형(Yeon-Hyeong Lee),김갑순(Gab-Soon Kim) 제어로봇시스템학회 2016 제어·로봇·시스템학회 논문지 Vol.22 No.12
This paper describes the design of a cellphone curved glass measuring device using by camera. The measuring device was composed of two camera, two backlight system, a body and so on, and the program was made for a camera calibration and noise removal, and also the program was made for height measurement of a cellphone curved glass using by subpixel algorism. And then a new technique for measuring the height of the cell phone curved glass was proposed. The characteristics test of height measurement of gage blocks and cell phone curved glasses was carried out, the error of the height measurement of gage block is less than ±0.005 and the error of the height measurement of the cell phone curved glasses is less than ±0.005. Thus it thought that the designed cellphone curved glass measuring device and the new technique for measuring the height was used to measure the height of the cellphone curved glass.
김한솔(Han Sol Kim),주영훈(Young Hoon Joo),박진배(Jin Bae Park) 한국지능시스템학회 2018 한국지능시스템학회논문지 Vol.28 No.2
본 논문에서는 연속 시간 상호 결합 카오스 시스템을 위한 분산 퍼지 동기화 방법을 제안한다. 이를 위해, 구동 (drive)과 응답(response) 카오스 시스템을 각각 연속 시간 상호 결합 타카기-수게노 (Takagi-Sugeno: T-S) 퍼지 모델로 표현하며, 두 시스템의 응답을 동기화하는 분산 퍼지 동기화 제어기의 설계 방법을 선형 행렬 부등식 (linear matrix inequality: LMI) 형태로 유도한다. 또한, 설계 유연성의 증대를 위해 본 논문에서는 구동 카오스 시스템의 상호 결합률을 정확히 알지 못하며, 상한 조건만 알고 있다고 가정한다. 이에 더해, 구동과 응답 카오스 시스템의 소속 함수를 모두 포함하는 새로운 퍼지 리아푸노프 (Lyapunov) 함수를 제안하며, 이를 통해 동기화 조건을 수치적으로 완화한다. 마지막으로, 제안하는 방법의 타당성을 시뮬레이션 예제를 통해 검증한다. In this paper, we propose a decentralized fuzzy synchronization method for continuous-time interconnected chaotic systems. To this end, drive and response chaotic systems are represented as continuous-time interconnected Takagi-Sugeno (T-S) fuzzy model, and its synchronization controller design method is proposed in terms of linear matrix inequalities (LMIs). Also, in order to increase the design flexibility, it is assumed that the interconnection rate of the drive chaotic system is not known exactly but its upper bound condition only can be known. In addition, we define a novel fuzzy Lyapunov function that consists of both membership functions of the drive and response chaotic systems, thereby numerically relaxing the resulting synchronization condition. Finally, the effectiveness of the proposed method is validated through a simulation example.
열량계와 겉보기 활성화 에너지를 이용한 콘크리트의 압축강도 예측에 관한 실험적 연구
김한솔 ( Kim Han-sol ),장종민 ( Jang Jong-min ),김영관 ( Kim Yeung-kwan ),이한승 ( Lee Han-seung ) 한국건축시공학회 2020 한국건축시공학회 학술발표대회 논문집 Vol.20 No.2
Predicting the compressive strength of concrete is important for shortening construction time and reducing construction costs. In this study, the coefficients required for maturity method and compressive strength prediction equation were calculated by measuring the cement hydration reaction rate, concrete setting time and ultimate strength. The experiment was conducted in an isothermal environment of 10°C, 20°C and 30°C using a normal Portland cement, and the experiment was conducted with a total of 9 levels of W/C (40%, 50%, 60%) of 3 levels for each temperature. As a result of comparing the predicted strength and the measured strength for each blend, only an error of less than 5% was found for all blending and curing periods.
2성분계 콘크리트의 구조체 보정강도(mSn) 산정을 위한 적산온도 기반 콘크리트의 압축강도 예측 연구
김한솔 ( Kim Han-sol ),이한승 ( Lee Han-seung ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.1
The compressive strength of concrete is greatly affected by the temperature inside the concrete at the initial age immediately after pouring. In the KCI Concrete Standard Specification, only the temperature correction strength (Tn) according to the curing temperature is applied in the mixing strength calculation formula, and mSn is not considered. The formula based on the Chrino model of the blast furnace slag concrete was calculated, and the strength of the structural concrete and the strength of the water cured specimen in the same mixture were compared with the predicted strength. As a result, the error between the predicted strength and the measured strength was greater in the structural concrete than in the concrete specimen.
김한솔,이경준,정동연,이연형,박재현,김갑순,Kim, Han-Sol,Lee, Kyung-Jun,Jung, Dong-Yean,Lee, Yeon-Hyeong,Park, Jea-Hyun,Kim, Gab-Soon 제어로봇시스템학회 2015 제어·로봇·시스템학회 논문지 Vol.21 No.8
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.