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홍재용 ( Hong Jae Yong ),신응배 ( Sin Eung Bae ),김연권 ( Kim Yeon Gwon ),김백중 ( Kim Baeg Jung ) 한국물환경학회 2003 한국물환경학회지 Vol.19 No.4
Recently, in order to meet the Strengthened effluent standard retrofitting the conventional activated sludge process into the advanced treatment process is on the increase, and the changes in microbial biomass fractions within the corresponding process largely affect the effluent water quality. depending on the operational condition. In this study, in order to evaluate the Changes in microbial fractions within the process, depending on the process change. weekly monitoring and respirometric method performed. As results from observing profile changes. the acclimation towards corresponding process and substrate was completed after about 4-5 weeks of adaptation period. The biomass fractions of heterotrophs and autotrophs for activated sludge and BNR process sludge changed from 19.0-21.8 to 15.8-16.1% and from 0.8-1.0 to 7.6-8.8% in VSS. respectively. Based on these results, it was concluded that the Changes in characteristics of activated Sludge process and advanced treatment process, depending on the microbial acclimation, can be better explained.
Truck Scale 용 Load Cell의 Smart interface Board 개발
박찬원(Chan Won Park),박종연(Chong Yeon Park),홍재용(Jae Yong Hong),최규석(Gyu Suk Choi),안광희(Kwang Hee An) 강원대학교 산업기술연구소 1995 産業技術硏究 Vol.15 No.-
This paper presents the design of a smart A/D conversion interface used for measuring the load of a truck. Since the load-cell sensor to be used is very sensitive for weight variation, the interface board must have the low-drift and the A/D conversion for accuracy. A new integrator and comparator has been developed to reduce the offset voltage and the drift current of operational amplifiers and has been adapted into the interface board. Also, a software algorithm has been developed to obtain the stable and accrurate A/D conversion. This software includes a RS-485 communicationprogram to control the interface, which gives a capability of backing-up the calibration data and transferring control data. The test and evaluation of the designed interface has been shown as having the better performance compared to the other types of existing weighing systems and sensor instruments.