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Intell. Syst. Technol."],"published-print":{"date-parts":[[2021,4,30]]},"abstract":"<jats:p>Data-driven models are becoming essential parts in modern mechanical systems, commonly used to capture the behavior of various equipment and varying environmental characteristics. Despite the advantages of these data-driven models on excellent adaptivity to high dynamics and aging equipment, they are usually hungry for massive labels, mostly contributed by human engineers at a high cost. Fortunately, domain adaptation enhances the model generalization by utilizing the labeled source data and the unlabeled target data. However, the mainstream domain adaptation methods cannot achieve ideal performance on time series data, since they assume that the conditional distributions are equal. This assumption works well in the static data but is inapplicable for the time series data. Even the first-order Markov dependence assumption requires the dependence between any two consecutive time steps. In this article, we assume that the causal mechanism is invariant and present our Causal Mechanism Transfer Network (CMTN) for time series domain adaptation. By capturing causal mechanisms of time series data, CMTN allows the data-driven models to exploit existing data and labels from similar systems, such that the resulting model on a new system is highly reliable even with limited data. We report our empirical results and lessons learned from two real-world case studies, on chiller plant energy optimization and boiler fault detection, which outperform the existing state-of-the-art method.<\/jats:p>","DOI":"10.1145\/3445033","type":"journal-article","created":{"date-parts":[[2021,3,9]],"date-time":"2021-03-09T17:06:43Z","timestamp":1615309603000},"page":"1-21","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":12,"title":["Causal Mechanism Transfer Network for Time Series Domain Adaptation in Mechanical Systems"],"prefix":"10.1145","volume":"12","author":[{"given":"Zijian","family":"Li","sequence":"first","affiliation":[{"name":"School of Computer, Guangdong University of Technology, Guangzhou, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8972-167X","authenticated-orcid":false,"given":"Ruichu","family":"Cai","sequence":"additional","affiliation":[{"name":"School of Computer, Guangdong University of Technology, Guangzhou, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hong Wei","family":"Ng","sequence":"additional","affiliation":[{"name":"Advanced Digital Science Center, Singapore"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marianne","family":"Winslett","sequence":"additional","affiliation":[{"name":"University of Illinois, Urbana Champaign"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tom Z. 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