RANDOM PROPORTIONAL WEIBULL HAZARD MODEL : AN APPLICATION TO TRAFFIC CONTROL SYSTEMS

Abstract

In this paper, the hazard model is presented to describe the fault generation processes of the equipments with time-dependent hazard rates for the asset management of the large-scaled information systems. In doing so, the time-dependent hazard rate is formulated by the Weibull hazard model; the heterogeneity of the hazard rates across the equipment types is explained by the random proportional Weibull hazard model, where the hazard rates are subject to Gamma distribution. The paper also presents the estimation techniques for the proposed model. The model is applied to estimate the fault rates of the information equipments of the traffic control systems in the real world, and the applicability of the model is investigated through a case study.