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dc.contributor.authorWeng, Weiweien_US
dc.contributor.authorPratama, Mahardhikaen_US
dc.contributor.authorAshfahani, Andrien_US
dc.contributor.authorYapp, Edward Kien Yeeen_US
dc.identifier.citationWeng, W., Pratama, M., Ashfahani, A. & Yapp, E. K. Y. (2021). Online semisupervised learning approach for quality monitoring of complex manufacturing process. Complexity, 2021, 3005276-.
dc.description.abstractData-driven quality monitoring is highly demanded in practice since it enables relieving manual quality inspection of the product quality. Conventional data-driven quality monitoring is constrained by its offline characteristic thus being unable to handle streaming nature of sensory data and nonstationary environments of machine operations. Recently, there have been pioneering works of online quality monitoring taking advantage of online learning concepts in the literature, but it is still far from realization of minimum operator intervention in the quality monitoring because it calls for full supervision in labelling data samples. This paper proposes Parsimonious Network++ (ParsNet++) as an online semisupervised learning approach being able to handle extreme label scarcity in the quality monitoring task. That is, it is capable of coping with varieties of semisupervised learning conditions including random access of ground truth and infinitely delayed access of ground truth. ParsNet++ features the one-pass learning approach to deal with streaming data while characterizing elastic structure to overcome rapidly changing data distributions. That is, it is capable of initiating its learning structure from scratch with the absence of a predefined network structure where its hidden nodes can be added and discarded on the fly in respect to drifting data distributions. Furthermore, it is equipped by a feature extraction layer in terms of 1D convolutional layer extracting natural features of multivariate time-series data samples of sensors and coping well with the many-to-one label relationship, a common problem of practical quality monitoring. Rigorous numerical evaluation has been carried out using the injection molding machine and the industrial transfer molding machine from our own projects. ParsNet++ delivers highly competitive performance even compared to fully supervised competitors.en_US
dc.description.sponsorshipNational Research Foundation (NRF)en_US
dc.rights© 2021 Weng Weiwei et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.en_US
dc.subjectEngineering::Computer science and engineeringen_US
dc.titleOnline semisupervised learning approach for quality monitoring of complex manufacturing processen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Computer Science and Engineeringen_US
dc.contributor.researchSingapore Institute of Manufacturing Technologyen_US
dc.description.versionPublished versionen_US
dc.description.acknowledgementThis project was financially supported by National Research Foundation, Republic of Singapore, under IAFPP in the AME domain (contract no. A19C1A0018).en_US
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