In this study, a new warranty service strategy is proposed and analyzed. This strategy adds the renewing free-replacement warranty to a non-repairable product sold under the rebate warranty policy. According to the renewing free-replacement warranty, the seller (manufacturer) is responsible for replacing all failed product during the warranty period, and the warranty begins anew with each repla...

product mix problem (pmp) is one of the most important and complicated problems in production systems. different approaches have been applied to solve this problem, among them, theory of constraints (toc) has been widely considered since 1990s. this paper develops a distinguished algorithm to solve product mix prob-lems that is efficient both in single and multi-bottleneck problems. at first, t...

Let G be a finite group. Efficient generation of nearly uniformly distributed random elements in G, starting from a given set of generators of G, is a central problem in computational group theory. In this paper we demonstrate a weakness in the popular “product replacement algorithm,” widely used for this purpose. The main results are the following. Let Nk(G) be the set of generating k-tuples o...

This paper provides a replacement policy for warranty products with different failure rate from the consumer’s viewpoint. Assume that the product is replaced once within a finite planning horizon, and the failure rate of the second product is lower than the failure rate of the first product. Within warranty period (WP), the failed product is corrected by minimal repair without any cost to the c...

proper education and notification of patients undergoing heart valve replacement is of paramount importance. the past decade has witnessed a growing interest in the use of modern, advanced technologies in medicine and patient education. this study aimed to introduce an education-notification application for patients undergoing heart valve replacement. research was carried out in two phases of s...