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1,456 results on '"Chang Tang"'

170. State space model of undrained triaxial test data for Bayesian identification of constitutive model parameters

Author

Chang Tang, Zi-Jun Cao, Yi Hong, and Wei Li

Subjects
Earth and Planetary Sciences (miscellaneous), Geotechnical Engineering and Engineering Geology
Abstract

Soil constitutive model parameters can be identified from triaxial test data. The identification is frequently performed by fitting a constitutive model to triaxial test data from a purely statistical or probabilistic perspective based on an assumption that measurements are independent. This ignores the sequential attribute of triaxial test data and is, hence, not realistic. In this paper, a probabilistic state space model (SSM) is proposed for undrained triaxial test data analysis, with which the sequential data attribute is explicitly considered and a constitutive model (physics) is linked to the SSM model (statistics) in a natural way. Then, constitutive model parameters can be rigorously learned under a Bayesian framework based on the SSM without artificially augmenting them into hidden variables of SSM. Without loss of generality, the modified Cam Clay (MCC) model is taken as an example to develop the SSM and to demonstrate the proposed Bayesian framework, which is illustrated using simulated and real-life data. Results from the proposed Bayesian framework based on the SSM include not only the best estimates of MCC model parameters but also their posterior distributions for quantifying the identification uncertainty, based on which the identifiability of MCC model parameters is discussed and highlighted.

Published
2023
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182. Engraving customer experiences through digital technologies

Author

Chang-Tang Chiang

Subjects
Marketing
Abstract

Purpose In recent decades, customer experiences (CXs) have gained considerable attention from both academics and service industries. However, the role of digital technologies in CXs is largely ignored. This study aims to explore the manners of digital experience (DX) and to leverage these manners for service design. Design/methodology/approach A total of 2,178 journal articles published as of January 2022 were collected from nine high-impact service journals. Social network analysis and cluster analysis were used to analyze 5,289 keywords and 22,645 edges. Findings Four DX manners (utility, sociability, informativeness and arousal) are identified from the keywords of the qualifying articles. Originality/value A digital experience service model is developed based on the concept of CX and DX manners. Academic and managerial contributions are discussed.

Published
2022
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