<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div class="" style="caret-color: rgb(34, 34, 34); color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif;">Caros,</div><div class="" style="caret-color: rgb(34, 34, 34); color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif;"><br class=""></div><div class="" style="caret-color: rgb(34, 34, 34); color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif;">Gostaríamos de convidar a todos para o próximo seminário conjunto UFSCar/ICMC-USP, que ocorrerá no dia <b class="">21</b><b class="">/05</b>, <b class="">às 14h</b>. Seguem informações abaixo. <b class="">Devido a problemas de invasões que têm ocorrido em alguns eventos online, o link do evento será divulgado apenas no dia [</b><b class=""><a href="http://www.pipges.ufscar.br/seminarios/21-05-2021-modeling-multivariate-degradation-processes-with-time-variant-covariates-and-imperfect-maintenance-effects-speaker-olivier-gaudoin-universite-grenoble-alpes" class="">AQUI</a>].</b></div><div class="" style="caret-color: rgb(34, 34, 34); color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif;"><br class=""></div><div class="" style="caret-color: rgb(34, 34, 34); color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif;">Sintam-se à vontade para divulgar (arquivo em anexo) entre eventuais interessados.</div><div class="" style="caret-color: rgb(34, 34, 34); color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif;"><br class=""></div><div class="" style="caret-color: rgb(34, 34, 34); color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif;">Saudações,</div><div class="" style="caret-color: rgb(34, 34, 34); color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif;">Michel</div><div class="" style="caret-color: rgb(34, 34, 34); color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif;"><br class=""></div><div class="" style="caret-color: rgb(34, 34, 34); color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif;"><div style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline; color: rgb(0, 0, 0); font-family: Roboto, sans-serif; font-size: 13.9776px; font-variant-ligatures: normal; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); text-decoration-thickness: initial;" class=""><div style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class=""><strong style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class="">Scheduled for:</strong><br style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class=""><span style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class="">May 21, 2021, at 2:00 pm</span></div><div style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class=""><span style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class="">(GMT-03:00) Brasilia Standard Time - Sao Paulo</span><br style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class=""><br style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class=""><strong style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class="">Streaming:</strong><br style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class=""><span style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class=""><span style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class=""><span style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class="">Google Meet </span></span></span></div></div><div style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline; color: rgb(0, 0, 0); font-family: Roboto, sans-serif; font-size: 13.9776px; font-variant-ligatures: normal; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); text-decoration-thickness: initial;" class=""><span style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class=""> </span></div><div style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline; color: rgb(0, 0, 0); font-family: Roboto, sans-serif; font-size: 13.9776px; font-variant-ligatures: normal; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); text-decoration-thickness: initial;" class=""><span style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class=""><b style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class="">Speaker</b><span style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class="">:</span></span></div><div style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline; color: rgb(0, 0, 0); font-family: Roboto, sans-serif; font-size: 13.9776px; font-variant-ligatures: normal; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); text-decoration-thickness: initial;" class=""><span style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class=""><span style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class="">Olivier Gaudoin (</span><span style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class="">Université Grenoble Alpes)</span><br style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class=""><br style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class=""><b style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class="">Title</b><span style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class="">:</span></span></div><div style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline; color: rgb(0, 0, 0); font-family: Roboto, sans-serif; font-size: 13.9776px; font-variant-ligatures: normal; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); text-decoration-thickness: initial;" class=""><span style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class=""><span style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class="">Modeling multivariate degradation processes with time-variant covariates and imperfect maintenance effects</span><b style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class=""><br style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class=""></b><br style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class=""><b style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class="">Abstract</b><span style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class="">:</span></span></div><div style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline; color: rgb(0, 0, 0); font-family: Roboto, sans-serif; font-size: 13.9776px; font-variant-ligatures: normal; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); text-decoration-thickness: initial;" class=""><span style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class="">This paper proposes two types of degradation models that are suitable for describing multivariate degrading systems subject to time-variant covariates and imperfect maintenance activities. A multivariate Wiener process is constructed as a baselinemodel, on top of which two types of models are developed to meaningfully characterize the time-variant covariates and imperfect maintenance effects. The underlying difference between the two models lies in the way of capturing the influences of covariates and maintenance: The first model reflects these impacts in the degradation rates/paths directly, whereas the second one describes the impacts by modifying the time scales governing the degradation processes. In each model, two particular imperfect maintenance models are presented, which differ in the extent of reduction in degradation level or virtual age. The two degradation models are then compared in certain special cases. The proposed multivariate degradation models pertain to complex industrial systems whose health deterioration can be characterized by multiple performance characteristics and can be altered or affected by maintenance activities and operating/environmental conditions.</span></div><div style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline; color: rgb(0, 0, 0); font-family: Roboto, sans-serif; font-size: 13.9776px; font-variant-ligatures: normal; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); text-decoration-thickness: initial;" class=""><span style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class=""> </span></div><div style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline; color: rgb(0, 0, 0); font-family: Roboto, sans-serif; font-size: 13.9776px; font-variant-ligatures: normal; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); text-decoration-thickness: initial;" class=""><span style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class=""><span style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class=""><b style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class="">Bio:</b></span></span></div><div style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline; color: rgb(0, 0, 0); font-family: Roboto, sans-serif; font-size: 13.9776px; font-variant-ligatures: normal; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); text-decoration-thickness: initial;" class=""><span style="margin: 0px; padding: 0px; list-style: none; vertical-align: baseline;" class="">Olivier Gaudoin received the M.Sc. and Ph.D. degrees in applied mathematics from Grenoble University, France, in 1986 and 1990, respectively. He is a Professor at Université Grenoble Alpes, France, in the Graduate School of Computer Science and Applied Mathematics. He is Director of International Relations of this School. His research interests are probabilistic modeling and statistical analysis for the reliability of complex systems, including ageing and maintenance modeling, competing risks, goodness-of-fit testing, and random processes in reliability.</span></div></div><div class="">
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