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Durham University

Research & business

Research lectures, seminars and events

The events listed in this area are research seminars, workshops and lectures hosted by Durham University departments and research institutes. If you are not a member of the University, but  wish to enquire about attending one of the events please contact the organiser or host department.


 

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Events for 2 December 2019

IAS Fellows' Seminar - Technical solutions to political problems? Examining the use and potential of inclusivity mechanisms in today’s peace processes

1:00pm to 2:00pm, Seminar Room, Institute of Advanced Study, Johanna Poutanen (Crisis Management Initiative)

Contact enquiries.ias@durham.ac.uk for more information about this event.


Bin Liu: A finite-horizon condition-based maintenance for a two-unit system with dependent degradation processes

1:00pm, CM107

Traditional condition-based maintenance policies are evaluated under the assumption of an infinite horizon, which, however, fails to meet many real scenarios, since a machine or equipment will usually be abandoned after running a few periods. In this study, we develop a condition-based maintenance model for degrading systems within a finite operating horizon. In addition, different from most existing studies that focus on a single-unit system, we consider a system with two heterogeneous components. The components are subject to dependent degradation processes, characterized by a bivariate Gamma process. Periodic inspection is performed upon the system and the components are preventively replaced when their degradation levels at inspection exceed the preventive replacement thresholds. We formulate the maintenance problem as a Markov decision process (MDP) and employ dynamic programming for the calculation purpose. The optimal maintenance policy is achieved via minimizing the expected maintenance cost. We explore the structure property of the optimal maintenance policy and obtain the boundaries for various maintenance actions. Unlike the infinite horizon which leads to a stationary maintenance policy, for the finite horizon, the optimal decision is non-stationary, which indicates that the optimal maintenance actions vary at each inspection epoch. A numerical example is performed to illustrate the proposed model, in which we investigate the influence of stochastic and economic dependence on the optimal maintenance policy. It is concluded through the numerical results that higher stochastic dependence actually reduces the maintenance cost and higher economic dependence leads to higher preventive maintenance thresholds.

Contact sunil.chhita@durham.ac.uk for more information about this event.


Prof. Teresa Morgan: A New View of 'en Christo'?

3:30pm, Seminar Room C (D/TH107), Dept. of Theology & Religion, Abbey House, DH1 3RS, Durham

Contact francis.watson@durham.ac.uk for more information about this event.


Stan Chu Ilo : God in Africa: Modernity, Christianity, and Africa’s Futures

5:00pm, Venue TBA

Contact ccs.admin@durham.ac.uk for more information about this event.