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A diagnostics and prognostics framework for multi-component systems with wear interactions: application to a gearbox-platform (2022)
Journal Article
Assaf, R., Do, P., & Scarf, P. (2022). A diagnostics and prognostics framework for multi-component systems with wear interactions: application to a gearbox-platform. Pesquisa operacional (Impresso), 42, https://doi.org/10.1590/0101-7438.2022.042nspe1.00264770

We present a novel framework for diagnostics and prognostics for multi-component systems with wear interaction between components. The principal elements of this framework are: health-state indicator extraction using signal-processing; clustering of... Read More about A diagnostics and prognostics framework for multi-component systems with wear interactions: application to a gearbox-platform.

Modifying Bradley–Terry and other ranking models to allow ties (2020)
Journal Article
Baker, R., & Scarf, P. (2021). Modifying Bradley–Terry and other ranking models to allow ties. IMA Journal of Management Mathematics, 32(4), 451-463. https://doi.org/10.1093/imaman/dpaa027

Models derived from distributions of order-statistics are useful for modelling ranked data. The well-known Bradley–Terry (BT) and Plackett–Luce (PL) models can be derived from the order statistics of the exponential distribution but cannot handle tie... Read More about Modifying Bradley–Terry and other ranking models to allow ties.

Preventive replacement with defaulting (2020)
Journal Article
Alotaibi, N., Cavalcante, C., Lopes, R., & Scarf, P. (2020). Preventive replacement with defaulting. IMA Journal of Management Mathematics, 31(4), 491-504. https://doi.org/10.1093/imaman/dpaa002

This paper models age replacement and block replacement when there is the possibility of defaulting on the planned maintenance. A default occurs when a planned preventive replacement is not executed, and we discuss how defaults can arise in practice.... Read More about Preventive replacement with defaulting.

On the relationship between financial performance and position of businesses in supply chain networks (2020)
Journal Article
Seiler, A., Papanagnou, C., & Scarf, P. (2020). On the relationship between financial performance and position of businesses in supply chain networks. International Journal of Production Economics, 227, https://doi.org/10.1016/j.ijpe.2020.107690

We investigate how the network position of organisations in an extended supply chain network impacts their financial performance. The paper argues that performance measurement tools should incorporate a network (external, connectedness) perspective... Read More about On the relationship between financial performance and position of businesses in supply chain networks.

Recognizing Events 4.0 : the digital maturity of events (2020)
Journal Article
Ryan, W., Fenton, A., Ahmed, W., & Scarf, P. (2020). Recognizing Events 4.0 : the digital maturity of events. International Journal of Event and Festival Management, 11(1), 47-68. https://doi.org/10.1108/IJEFM-12-2019-0060

• Purpose – The purpose of this research is to explore and define the digital maturity of events using the Industry 4.0 model (I4.0), to create a definition for Events 4.0 (E4.0) and to place various relevant technologies on a scale of digital matu... Read More about Recognizing Events 4.0 : the digital maturity of events.

A cross-case analysis on models of football governance and the influence of supporter groups (2020)
Thesis
Gibson, I. A cross-case analysis on models of football governance and the influence of supporter groups. (Thesis). University of Salford

As the football industry continues to reach unprecedented levels of economic growth, elite clubs continue to capitalise on the financial riches on offer across Europe’s most popular leagues. In the quest for financial growth, historic clubs and their... Read More about A cross-case analysis on models of football governance and the influence of supporter groups.

A review on maintenance optimization (2019)
Journal Article
De Jonge, B., & Scarf, P. (2020). A review on maintenance optimization. European Journal of Operational Research, 285(3), 805-824. https://doi.org/10.1016/j.ejor.2019.09.047

To this day, continuous developments of technical systems and increasing reliance on equipment have resulted in a growing importance of effective maintenance activities. During the last couple of decades, a substantial amount of research has been car... Read More about A review on maintenance optimization.

Delay-time modelling of a critical system subject to random inspections (2019)
Journal Article
Scarf, P., Cavalcante, C., & Lopes, R. (2019). Delay-time modelling of a critical system subject to random inspections. European Journal of Operational Research, 278(3), 772-782. https://doi.org/10.1016/j.ejor.2019.04.042

We model the inspection-maintenance of a critical system in which the execution of inspections is random. The models we develop are interesting because they mimic realities in which production is prioritised over maintenance, so that inspections migh... Read More about Delay-time modelling of a critical system subject to random inspections.

Virtual series-system models of imperfect repair (2019)
Journal Article
Nafisah, I., Shrahili, M., Alotaibi, N., & Scarf, P. (2019). Virtual series-system models of imperfect repair. Reliability Engineering and System Safety, 188(Aug 19), 604-613. https://doi.org/10.1016/j.ress.2019.03.046

Novel models of imperfect repair are fitted to classic reliability datasets. The models suppose that a virtual system comprises a component and a remainder in series. On failure of the component, the component is renewed, and on failure of the remain... Read More about Virtual series-system models of imperfect repair.

Imperfect inspection of a system with unrevealed failure and an unrevealed defective state (2019)
Journal Article
Cavalcante, C., Scarf, P., & Berrade, M. (2019). Imperfect inspection of a system with unrevealed failure and an unrevealed defective state. IEEE Transactions on Reliability, 68(2), 764-775. https://doi.org/10.1109/TR.2019.2897048

This paper proposes a model of inspection of a protection system in which the inspection outcome provides imperfect information of the state of the system. The system itself is required to operate on demand typically in emergency situations. The pu... Read More about Imperfect inspection of a system with unrevealed failure and an unrevealed defective state.

Perceived injustice and its impact on job outcomes : role of jealousy and self-efficacy (2018)
Thesis
Khan, M. (in press). Perceived injustice and its impact on job outcomes : role of jealousy and self-efficacy. (Thesis). University of Salford

Organizational injustice remains a matter of great concern due to its adverse effects on job outcomes. Extant research devoted much attention to investigate how perceptions of injustice impact employee attitudes and behaviours, but mostly through cog... Read More about Perceived injustice and its impact on job outcomes : role of jealousy and self-efficacy.

Modelling and application of condition-based maintenance for a two-component system with stochastic and economic dependencies (2018)
Journal Article
Do, P., Assaf, R., Scarf, P., & Iung, B. (2019). Modelling and application of condition-based maintenance for a two-component system with stochastic and economic dependencies. Reliability Engineering and System Safety, 182, 86-97. https://doi.org/10.1016/j.ress.2018.10.007

This paper develops a model of a condition-based maintenance policy for a two-component system with both stochastic and economic dependencies. The stochastic dependency is such that the degradation rate of each component depends not only on its own... Read More about Modelling and application of condition-based maintenance for a two-component system with stochastic and economic dependencies.

On outcome uncertainty and scoring rates in sport : the case of international rugby union (2018)
Journal Article
Scarf, P., Parma, R., & McHale, I. (2019). On outcome uncertainty and scoring rates in sport : the case of international rugby union. European Journal of Operational Research, 273(2), 721-730. https://doi.org/10.1016/j.ejor.2018.08.021

In this paper we investigate the relationship between outcome uncertainty and scoring rates in the framework of a “Poisson match”. We argue that increasing scoring rates in the hope of increasing entertainment may have a detrimental impact on the pop... Read More about On outcome uncertainty and scoring rates in sport : the case of international rugby union.

Wear rate-state interactions within a multi-component system : a study of a gearbox accelerated life testing platform (2018)
Journal Article
Assaf, R., Do, P., Nefti-Meziani, S., & Scarf, P. (2018). Wear rate-state interactions within a multi-component system : a study of a gearbox accelerated life testing platform. Proceedings of the Institution of Mechanical Engineers, Part O: Journal of Risk and Reliability, 232(4), 425-434. https://doi.org/10.1177/1748006X18764061

The degradation process of complex multi-component systems is highly stochastic in nature. A major side effect of this complexity is that components of such systems may have unexpected reduced life and faults and failures that decrease the reliabil... Read More about Wear rate-state interactions within a multi-component system : a study of a gearbox accelerated life testing platform.

Joint maintenance-inventory optimisation of parallel production systems (2018)
Journal Article
Zahedi-Hosseini, F., Scarf, P., & Syntetos, A. (2018). Joint maintenance-inventory optimisation of parallel production systems. Journal of Manufacturing Systems, 48(Part A), 73-86. https://doi.org/10.1016/j.jmsy.2018.06.002

We model a joint inspection and spare parts inventory policy for maintaining machines in a parallel system, where simultaneous downtime seriously impacts upon production performance and has a significant financial consequence. This dependency between... Read More about Joint maintenance-inventory optimisation of parallel production systems.

Modelling inspection and replacement quality for a protection system (2018)
Journal Article
Alberti, A., Cavalcante, C., Scarf, P., & Silva, A. (2018). Modelling inspection and replacement quality for a protection system. Reliability Engineering and System Safety, 176, 145-153. https://doi.org/10.1016/j.ress.2018.04.002

An inspection and replacement policy for a protection system is described by a mathematical model that incorporates multiple aspects of maintenance quality. A three-state component failure model is assumed, with a defective state preceding failure. T... Read More about Modelling inspection and replacement quality for a protection system.

Optimisation of inspection policy for multi-line production systems (2018)
Journal Article
Zahedi-Hosseini, F., Syntetos, A., & Scarf, P. (2018). Optimisation of inspection policy for multi-line production systems. European Journal of Industrial Engineering, 12(2), 233. https://doi.org/10.1504/EJIE.2018.090616

This paper develops a simulation model to determine the cost-optimum inspection policy for a multi-line production system taking account of simultaneous downtime. The machines in the multi-line system are subject to a two stage failure process that i... Read More about Optimisation of inspection policy for multi-line production systems.

Conditional inspection and maintenance of a system with two interacting components (2018)
Journal Article
Berrade, M., Scarf, P., & Cavalcante, C. (2018). Conditional inspection and maintenance of a system with two interacting components. European Journal of Operational Research, 268(2), 533-544. https://doi.org/10.1016/j.ejor.2018.01.042

In this paper we consider the inspection and maintenance of a two-component system with stochastic dependence. A failure of component 1 may induce the defective state in component 2 which in turn leads to its failure. A failure of component 1 and a d... Read More about Conditional inspection and maintenance of a system with two interacting components.

A general inspection and opportunistic replacement policy for one-component systems of variable quality (2017)
Journal Article
Cavalcante, C., Lopes, R., & Scarf, P. (2018). A general inspection and opportunistic replacement policy for one-component systems of variable quality. European Journal of Operational Research, 266(3), 911-919. https://doi.org/10.1016/j.ejor.2017.10.032

We model the influence of opportunities in a hybrid inspection and replacement policy. The base policy has two phases: an initial inspection phase in which the system is replaced if found defective; and a later wear-out phase that terminates with rep... Read More about A general inspection and opportunistic replacement policy for one-component systems of variable quality.

A study of postponed replacement in a delay time model (2017)
Journal Article
Berrade, M., Scarf, P., & Cavalcante, C. (2017). A study of postponed replacement in a delay time model. Reliability Engineering and System Safety, 168, 70-79. https://doi.org/10.1016/j.ress.2017.04.006

We develop a delay time model for a one component system with postponed replacement to analyze situations in which maintenance might not be executed immediately upon discovery of a defect in the system. Reasons for postponement are numerous: to avoid... Read More about A study of postponed replacement in a delay time model.