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Random Forest ensemble prediction of stent dimensions in microfabrication processes

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Abstract

The recent development of new laser machine tools for the manufacture of micro-scale metallic components has boosted demand in the field of medical applications. However, the optimization of this process encounters a major problem: a knowledge gap concerning the relation between the controllable parameters of these machine tools and the quality of the machined components. Our research proposes a two-step strategy to approach this problem for the manufacture of stents. First, a screening test identifies good and bad performance conditions for the laser process and generates useful information on cutting performance; then, a stent is manufactured under different cutting conditions and the most accurate machine learning technique to model this process is identified. This strategy is validated with the performance of experiments that vary pulse duration, laser power, and cutting speed, and measure two geometrical characteristics of the stent geometry. The results showed that linear Support Vector Machines can identify good and bad cutting conditions, while Random Forest ensembles of regression trees can predict with high accuracy the two characteristics of the stent geometry under study. Besides, this technique can extract useful information from the screening test that improves its final accuracy. In view of the small dataset size, an alternative based on the leave-one-out technique was used, instead of standard cross validation, so as to assure the generalization capability of the models.

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Correspondence to Joaquim Ciurana.

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Maudes, J., Bustillo, A., Guerra, A.J. et al. Random Forest ensemble prediction of stent dimensions in microfabrication processes. Int J Adv Manuf Technol 91, 879–893 (2017). https://doi.org/10.1007/s00170-016-9695-9

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  • DOI: https://doi.org/10.1007/s00170-016-9695-9

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