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대전시 공공하수처리시설 유입수 수질자료의 통계적 특성 및 추계학적 모의
박기정 ( Gi Jung Park ),정민재 ( Min Jae Jung ),이한샘 ( Han Saem Lee ),김덕우 ( Deok Woo Kim ),윤재영 ( Jae Yong Yoon ),백경록 ( Kyung Rock Paik ) 한국물환경학회 2012 한국물환경학회지 Vol.28 No.1
In this study, we analyze statistical characteristics of influent water quality in Daejeon waste water treatment plant and apply a stochastic model for data generation. In the analysis, the influent water quality data from year 2003 to 2008, except for year 2006, are used. Among water quality variables, we find strong correlations between BOD and T-N; T-N and T-P; BOD and T-P; CODMn and T-P; and BOD and CODMn. We also find that different water quality variables follow different theoretical probability distribution functions, which also depends on whether the seasonal cycle is removed. Finally, we generate the influent water quality data using the multi-season 1st Markov model (Thomas-Fiering model). With model parameters calibrated for the period 2003~2005, the generated data for 2007~2008 are well compared with observed data showing good agreement in general. BOD and T-N are underestimated by the stochastic model. This is mainly due to the statistical difference in observed data itself between two periods of 2003~2005 and 2007~2008. Therefore, we expect the stochastic model can be applied with more confidence in the case that the data follows stationary pattern.
메탈라스로 횡구속된 고성능 콘크리트의 성능향상에 관한 기초적 연구
김은호 ( Jin¸ En-hao ),정덕우 ( Jung¸ Duk-woo ),전충근 ( Jeon¸ Chung-keun ),홍상희 ( Hong¸ Sang-hee ),한천구 ( Han¸ Cheon-goo ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.1
This paper is a fundamental study on the mechanical properties of the high performance concrete confined with metal lath laterally. According to the results, the compressive strength and flexural strength increases with increase of metal lath thickness due to enhancing confined force. The brittle failure is caused at maximum load in plain concrete. But, in case of concrete confined with metal lath laterally, strain stress increases a little. In flexural load curve, energy absorbtion increases with increase of metal lath thickness, so it resists continuous load, deflection and crack is retained. Length change ratio decreases with increase of metal lath thickness due to confined force.