title: Evaluation of passenger health risk assessment of sustainable indoor air quality monitoring in metro systems based on a non-Gaussian dynamic sensor validation method.
abstract: Sensor faults in metro systems provide incorrect information to indoor air quality (IAQ) ventilation systems, resulting in the miss-operation of ventilation systems and adverse effects on passenger health. In this study, a new sensor validation method is proposed to (1) detect, identify and repair sensor faults and (2) evaluate the influence of sensor reliability on passenger health risk. To address the dynamic non-Gaussianity problem of IAQ data, dynamic independent component analysis (DICA) is used. To detect and identify sensor faults, the DICA-based squared prediction error and sensor validity index are used, respectively. To restore the faults to normal measurements, a DICA-based iterative reconstruction algorithm is proposed. The comprehensive indoor air-quality index (CIAI) that evaluates the influence of the current IAQ on passenger health is then compared using the faulty and reconstructed IAQ data sets. Experimental results from a metro station showed that the DICA-based method can produce an improved IAQ level in the metro station and reduce passenger health risk since it more accurately validates sensor faults than do conventional methods.
authors: Department of Environmental Science and Engineering, Center for Environmental Studies, Kyung Hee University, Yongin 446-701, Republic of Korea.
authors: MinJeong
authors: M
authors: Kim
authors: Department of Environmental Science and Engineering, Center for Environmental Studies, Kyung Hee University, Yongin 446-701, Republic of Korea.
authors: Hongbin
authors: H
authors: Liu
authors: Department of Architectural Engineering, Center for Sustainable Healthy Buildings, Kyung Hee University, Yongin 446-701, Republic of Korea.
authors: Jeong Tai
authors: JT
authors: Kim
authors: Department of Environmental Science and Engineering, Center for Environmental Studies, Kyung Hee University, Yongin 446-701, Republic of Korea. Electronic address: ckyoo@khu.ac.kr.
authors: ChangKyoo
authors: C
authors: Yoo
mesh_terms: D000393:Air Pollutants / Q000032:analysis* / Q000633:toxicity; D016902:Air Pollution, Indoor / Q000009:adverse effects / Q000032:analysis*; D004784:Environmental Monitoring / Q000295:instrumentation* / Q000379:methods; D006801:Humans; D011890:Railroads; D015203:Reproducibility of Results; D056910:Republic of Korea; D018570:Risk Assessment
chemical_list: D000393:Air Pollutants
keywords: Dynamic independent component analysis (DICA); Health risk assessment; Indoor air quality (IAQ); Metro systems; Sensor fault validation