this article, after explaining the concept of peace building in the framework of united nations peace operations, considers the challenges facing it. peace operations are a complex and inter-related set of activities which lack clear legal status in the united nations charter, but are accessible instruments for the maintenance of international peace and security. despite the fact that peace bui...

in this paper a single server queuing production system is considered which is subject to gradual deterioration. the system is discussed under two different deteriorating conditions. a planning horizon is considered and server which is a d/m/1 queuing system is gradually deteriorates through time periods. a maintenance policy is taken into account whereby the server is restored to its initial c...

The conventional method towards deriving schedule for a fleet of ships to minimize cost alone has the short-coming of not addressing the problem of operation revenue losses associated with delays during maintenance at ships dockyards. In this paper, a preventive maintenance schedule for a fleet of ships that incorporates op-portunity cost is presented. The idea is to assign a penalty cost to al...

Industries' increasing progress and complexity has made maintenance repair tasks very challenging, complex, time-consuming. Maintenance is one of the important sectors in several industries, improvement this sector can have excellent results. This paper develops a new prediction model based on Bayesian networks (BN) capabilities. The models include variables that experts determine their influen...