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This paper focuses on the formation of supplier selection strategies that are used in an operational context. Because of the nature of the modern day environment, designing and forming good strategies is a difficult and laborious task. The goal of this paper is to showcase our work on implementing an algorithm that is capable of self-assembling a strategy without the need for explicit knowledge or...
Improving customer satisfaction is important in order to create a good relationship between a company and its customers which will give benefit to both sides. One way to accomplish it is by conducting quality improvement. Quality improvement has a strong relationship with the customer satisfaction, so it is an important issue in manufacturing. This paper discusses an optimization model to allocate...
A modified hybrid imperfect maintenance model (MHIM) for machine working in piecewise constant operational condition (PCOC) is proposed considering the limitation of traditional age-based hybrid imperfect maintenance model, with the assumption that failure time in different operational condition (OC) satisfies accelerated failure time model (AFTM). Method for estimating the parameters also has been...
As oil and gas industry expands into the Arctic, operators struggle to reduce risks and improve safety, while keeping the cost of inspection and repair to a minimum level. One of the most effective ways to minimize the inspection and repair costs is to apply risk-based inspection (RBI) methods and tools. To identify, assess and map risk of failure of equipment, a number of RBI models, techniques and...
We need energy resources to assure performance of mechatronic systems. The performance assurance is of major importance in present systems since it leads to high availability and capability. It also helps to reduce failure occurrence. In the article we want to find the up state time of Li-ion batteries. Results are related to influence of the operating environment at different climatic levels. We...
Selection of potential supplier is a strategic decision taken by purchasing department which helps in ensuring a long term commitment between supplier and industry. Selection of supplier is a multi criteria decision making (MCDM) problem involving quantitative, qualitative, tangible and non tangible diverse criteria's. In this work a strategic frame work has been proposed which allows decision makers...
Medical information sharing is an important part in effective use of medical resources. However, some hospitals are unwilling to share their medical information or use other hospitals' medical information in self-interest in China. Thus, a government's incentive policy can lead hospitals to step up their efforts in sharing medical information. In this paper, based on the principal-agent theory, we...
Recently, the dynamic Reliability Block Diagram (DRBD) with the characteristics of intuitiveness and visibility has been extensively employed in industrial fields, such as aerospace, military facilities, nuclear energy and chemical industry, etc. However, there exists a limitation in the past research that the complexity of the reliability calculation considering the additional modelling constructs,...
In production activities, external events (e.g. weather, low market prices) may provide some opportunities to do the preventive maintenance with reduced cost. Implementing an appropriate maintenance policy considering these opportunities can result a significant savings in total maintenance cost. This study focuses on developing a joint preventive and opportunistic maintenance strategy for a production...
This paper proposes a state space model to describe multivariate autocorrelated zero-inflated count series. The model extends the classical zero-inflated Poisson distribution into multivariate cases but is able to impose different zero inflations on different dimensions. Combing the zero inflation with the log-normal mixture of independent Poisson distribution, this model allows for flexible cross-correlations...
Failure boundaries are always far away from the center of the design space of variables for low failure probability problems. In order to make full use of samples, a partitioning method of experimental levels is proposed for improving general design of experiments in this paper. The method is implemented by non-uniformly partitioning experimental levels according to the probability density function...
Burn-in is an effective method to eliminate initial mortality and reduce field failure costs. As many products have been designed to be extremely reliable, traditional burn-in would almost not get a sufficient amount of failure data in a reasonable duration. If the failure associated with a degradation process, degradation-based burn-in can be implemented. Moreover, we hope the quality level of the...
This research investigates a k-out-of-n system in which the lifetime of operational and standby components, the repair time follow continuous phase-type (PH) distribution, instead of exponential distribution or others typical distributions. The proposed paper provides an analytic reliability model that is more suitable to characterize the real situation. The stationary distribution is built by using...
Considering maintenance resources assignments of the large-scale complex equipment, the policy that single repairman has multiple vacations is utilized to analyze a warm standby repairable system. The former models that the known conditions are usually assumed to follow exponential distribution or other typical distributions have many constraint conditions. It is assumed that the online component...
In equipment joint support, support tasks generated by different equipment share the resource of the support sites. Compared to conventional support system, more categories of support objects leads to a sharp increase in the number and randomness of support tasks. This makes the progress of some support activities affected by the resource occupation of other activities. In other words, the availability...
In labor-intensive industries such as services industry, utilization of precious manpower resources can make the difference in terms of profitability and meeting customer and/or project demands. Employing part-time workers on top of full-time workers is not uncommon in Singapore and the number of part-time workers is gradually increasing in the recent few years. From the modelling point of view, although...
Variable-fidelity (VF) approximation models are wildly used to replace computational expensive simulation models in complex engineering designs. In this paper, a design space reduction variable-fidelity metamodeling (DSR-VFM) approach is proposed. In the proposed DSR-VFM, addition scaling Kriging (ASK) is chosen as the approximation model and self-organizing maps (SOM) is adopt to reduce the design...
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