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Full-Text Articles in Engineering
Learning And Forgetting In Maintenance Outsourcing, Hakan Tarakci, Sunantha Teyarachakul, Kwei Tang
Learning And Forgetting In Maintenance Outsourcing, Hakan Tarakci, Sunantha Teyarachakul, Kwei Tang
Hakan Tarakci
We study the effects of learning and forgetting on maintenance outsourcing in this paper. This is an extension of the paper by Tarakci et al. (2009), which analyzed the effects of learning on maintenance outsourcing. In our model, a manufacturer offers a short-term outsourcing contract, where payment includes a fixed value along with cost subsidization for each preventive maintenance activity, to an external contractor. The contractor schedules and performs preventive maintenance activities as well as repairs the system if there is a failure. We consider two types of learning: natural learning and learning by costly efforts. We then analyze the …
On The Problem Of Production Deadline And Maintenance Outsourcing, Sharafali Moosa, Hakan Tarakci
On The Problem Of Production Deadline And Maintenance Outsourcing, Sharafali Moosa, Hakan Tarakci
Hakan Tarakci
In this paper we consider a production-maintenance problem in which a buyer and a supplier have already entered into a contractual relationship for a firm delivery date. Our focus is on the production-related decisions of the supplier rather than the nature of the contract itself. We assume that production rate is actually constant as long as the system is up and running but randomness arises in production due to downtimes as a result of unpredictable failures (breakdowns) and scheduled preventive maintenance activities. Production maintenance is outsourced. As production output is random due to unreliable production facilities, the supplier needs to …
The Convergence In Workers’ Skill Levels Under Learning And Forgetting: The Fixed-Point-Property Approach, Sunantha Teyarachakul, Dogan Comez, Hakan Tarakci
The Convergence In Workers’ Skill Levels Under Learning And Forgetting: The Fixed-Point-Property Approach, Sunantha Teyarachakul, Dogan Comez, Hakan Tarakci
Hakan Tarakci
This paper presents a study on the convergence of workers’ skill levels under learning and forgetting in processing time in a batch-manufacturing environment. The convergence properties are examined under assumptions of an infinite horizon, a constant demand rate, and a fixed lot size. Our work extends the convergence results of Teyarachakul, Chand, and Ward (2008) beyond Globerson and Levin’s (1987) exponential forgetting function and Wright’s (1936) learning curve to more general classes of learning and forgetting functions. We also discuss why early papers other than Teyarachakul, Chand, and Ward (2008) did not find other types of long-term behaviors beyond convergence …
Maintenance Outsourcing Of A Multi-Process Manufacturing System With Multiple Contractors, Hakan Tarakci, Kwei Tang, Herb Moskowitz, Robert Plante
Maintenance Outsourcing Of A Multi-Process Manufacturing System With Multiple Contractors, Hakan Tarakci, Kwei Tang, Herb Moskowitz, Robert Plante
Hakan Tarakci
Consider a manufacturer with a manufacturing system that consists of multiple processes. The manufacturer’s revenue is determined by the minimum of the uptimes among the processes. The maintenance functions of the processes are outsourced to independent contractors so that each contractor is responsible only for one process. A performance-based incentive contract is offered to each contractor, consisting of an uptime target level and a bonus rate for exceeding the uptime target. Under the incentive contract, a contractor receives a bonus only when the achieved uptime exceeds the target level specified in the contract. We develop a model for jointly determining …
Incentive Maintenance Outsourcing Contracts For Channel Coordination And Improvement, Hakan Tarakci, Kwei Tang, Herb Moskowitz, Robert Plante
Incentive Maintenance Outsourcing Contracts For Channel Coordination And Improvement, Hakan Tarakci, Kwei Tang, Herb Moskowitz, Robert Plante
Hakan Tarakci
Consider a manufacturer who has a process with an increasing failure rate over time. In order to improve the process performance, the following two types of maintenance activity are outsourced to an external contractor: (i) preventive maintenance is performed periodically to improve the reliability of the process when the process is functional; and (ii) corrective maintenance is used to restore the process to a specified condition when it fails. We consider the use of incentive contracts to induce the contractor to select the maintenance policy that optimizes the total profit of the manufacturer and contractor. It is demonstrated that an …