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조동회,정성숙,정구춘,이경호,박면용,김병수 ( Dong Hoe Cho,Seong Suk Jeong,Koo Chun Chung,Kyung Ho Lee,Myon Yong Park,Byung Soo Kim ) 한국센서학회 1996 센서학회지 Vol.5 No.4
The polymeric membrane pH sensor based on HDBA(hexyldibenzylamine) or HDPA(hexyidiphenylamine) as hydrogen ion carrier was prepared and electrochemical characterization for the variation of a temperature and membrane thickness were studied on. The sensor based on HDPA was not responded selectively to hydrogen ion. The sensor based on HDBA was responded linearly to hydrogen ion in the range of pH 2 - pH 10, it showed the fast response time of 30 - 50sec. and Nernstian slope of 53.6mV/pH. The interfering effect on alkali and alkaline earth metal ions of pH sensor were lower than glass pH sensor. There was shown a good reproducibility and stability with the precision of 2 - 4mV (±0.1mV).
Tribenzylamine Ionophore를 이용한 pH-ISE의 제조 및 임상응용
조동회 ( Dong Hoe Cho ),박정오 ( Chung Oh Park ) 대한임상검사과학회 2006 대한임상검사과학회지(KJCLS) Vol.38 No.1
The pH-ISE(ion selective electrode) based on tribenzylamine as a hydrogen ion carrier was prepared and its electrochemical characterization was studied. It responded linearly to hydrogen ions in the range of pH 3.1 - pH 11.0 and the Nernstian slope showed 55.0 mV/pH (at 20 ± 0.2℃), it also showed a fast response time of 8 sec. When it was directly applied to human blood(pH 6.0-8.5), we could get the same satisfying results. A good reproducibility and stability were shown with the precision of 2 mV (±0.1). The pH-ISE based on tribenzylamine exhibited biocompatibility in clinical applications.
세라믹 여재를 이용한 상향류식 여과시스템에 의한 부유물질 제거
조동회 ( Dong Hoe Cho ),정영호 ( Young Ho Chung ),안효민 ( Hyo Min Ahn ),임병혁 ( Byung Hyuk Lim ) 한국수처리학회 2022 한국수처리학회지 Vol.30 No.3
The purpose of this study is to derive the optimal conditions of the design factors of non-point pollution reduction facilities in upflow filtration systems. The physical characteristics of the ceramic media and their preparation were investigated, including measurement of the suspended solids removal efficiency and the associated headloss as well as the recovery period of the headloss, which was assessed by its reduction through backwashing when loading solids. The ceramic media used in the upflow filtration system had a particle diameter of 2 to 4 mm, a specific gravity of 0.633, a uniformity coefficient of 1.26, a porosity of 46.7%, and a permeability coefficient of 1.8 cm/sec. When the height of the filter media layer was 60 cm, the headloss of the filter media was 2.03 cm on average at no load. The assessment of this average accounted for three measurements of 30 minute intervals. The average removal efficiency of suspended solids was 82.9% when the suspended solids inflow concentrations were 150±10 mg/L, 250±10 mg/L, and 300±10 mg/L. Additionally the headloss of the filter media layer was 2.51 cm when the accumulated solids were loaded. Effective washing was achieved when the air washing and backwashing experiments were carried out for 5 minutes at an air flow rate of 5 m3/h and water washing at 4 m3/h, respectively.