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벚나무 탄화물을 이용한 합성폐수 내 아연 이온의 흡착 특성
배우빈,박가람,정다윤,안종화 한국폐기물자원순환학회 2018 한국폐기물자원순환학회지 Vol.35 No.3
Carbonaceous material prepared from oriental cherry can be used for the adsorption of zinc ion from an aqueous solution. Parameters such as pH (4-11), temperature (293-333 K), mixing intensity (10-120 rpm) and contact time (0.5- 90 min) were studied. Increasing pH (99.6% at pH 11) and temperature (99.8% at 333 K) caused an increase in adsorption capacity. A pseudo-equilibrium state was reached within 1 min of contact time. Removal efficiency of zinc ion remained constant regardless of mixing intensity. The adsorption equilibrium data were best represented by the Freundlich adsorption isotherm. The calculated maximum adsorption capacity was 3.541 mg/g. Thermodynamic studies demonstrated that the adsorption process was spontaneous with Gibb’s free-energy values ranging between -3.272 and -15.594 kJ/mol and endothermic with an enthalpy value of 86.984 kJ/mol. Therefore, carbonaceous material from oriental cherry was shown to have good potential for the adsorption of zinc ion.
주거용 건물에서 핑거프린팅 기법을 이용한 재실자의 위치 기반 바닥 복사난방 제어
배우빈(Bae, Woo-Bin),고종환(Ko, Jong-Hwan),문선혜(Mun, Sun-Hye),허정호(Huh, Jung-Ho) 대한건축학회 2015 대한건축학회논문집 Vol.31 No.11
The purpose of this study is to control the occupants" location based radiant floor heating system for improving the inefficient use of energy in the residential building. In this study, the fingerprinting method was used to estimate the location of occupants connected to Wi-Fi through the smartphone. Based on the location of occupants, the energy usage amount and comfort of representative room control method and individual room control method were analyzed. As a result of this study, the location estimation of occupants showed 100% of accuracy. As compared to the existing control method, the corresponding control method showed better comfort and reduced energy consumption by 8.5%.