In this paper we analyze periodic maintenance strategies for managing replicated objects in mobile wireless environments. Under periodical maintenance strategies, the system periodically checks local cells to determine if a replicated object should be allocated or deallocated in a cell to reduce the access cost. We develop a performance model based on Petri nets that considers the missing-read ...

Maintenance contracts have received significant attention in last ten years. It has huge potential to reduce the upfront investments in maintenance infrastructure, specialised maintenance facilities, and risk for owners through expert services provided by the original equipment manufacturers and/ or specialist maintenance providers. There is a growing trend for asset intensive Industries to out...

Background: Acquired immune deficiency syndrome (AIDS) is one of the greatest social health problems in many communities in the twenty-first century. Methadone maintenance treatment (MMT) could decrease HIV infection among injection drug users (IDU). The main aim of this paper was to determine the cost-effectiveness of the governmental MMT program to prevent human immunodeficiency virus (HIV) i...

At many circumstances, in heat exchange processes several exchangers were used with different cost laws due to their pressure ratings, materials of construction and exchange3r types. In such circumstances traditional methods of pinch technology can not be led to minimum total annual cost may cause some other disadvantages like more complexity or higher maintenance. In this research work a n...

BACKGROUND Although methadone maintenance is effective in reducing injection drug use, needle sharing, and the overall mortality associated with opiate abuse, many health plans offer little or no access to methadone, and many methadone providers do not comply with treatment guidelines regarding dose, duration of treatment, or provision of ancillary services. Moral and political judgments have h...

An optimal maintenance strategy for cost effective and machine reliability in food manufacturing industries was developed this study. Maintenance parameters were employed to develop cost-reliability based model terms of an using lingo solver. The cost-reliabilitybased considered system’s reliability, equipment failure, preventive maintenance, corrective downtime associated with - maintenance. A...

Purpose: High maintenance cost is the common issue in building industry due to low service quality of maintenance management in Malaysia. Lack of preventive measure is the problem that implicates poor maintenance performance. Scheduled maintenance is suggested to improve the maintenance performance. However, the effectiveness of scheduled maintenance can be greatly influenced by the availabilit...

this paper studies a maintenance policy for a system composed of two components, which are subject to continuous deterioration and consequently stochastic failure. the failure of each component results in the failure of the system. the components are inspected periodically and their deterioration degrees are monitored. the components can be maintained using different maintenance actions (repair...