this study considers an eoq inventory model with advance payment policy in a fuzzy situation by employing two types of fuzzy numbers that are trapezoidal and triangular. two fuzzy models are developed here. in the first model the cost parameters are fuzzified, but the demand rate is treated as crisp constant. in the second model, the demand rate is fuzzified but the cost parameters are treated ...

fter 20-30 years ships are at the end of their effective service life [9] and they are then dismantled. Ship dismantling in the US is quite different from in developing countries, and ship deconstruction costs are much higher in the US. The ship deconstructors in developing countries earn significant profits because of lower recycling costs of the ships and higher resale values of the scrap. Pr...

a new mathematical model for the optimal production isformulated for the inventory management system under time-varyingand stochastic inflation environment for deteriorating items. the timehorizon is finite and demand rate is dependent to the inflation. in thereal situation, some but not all customers will wait for backlogged itemsduring a shortage period, such as for fashionable commodities or...

The purpose of this study was to examine the expected returns of Carhart model compared to the capital asset pricing model and the implicit capital cost model based on cash and capital returns of growth and value stocks. The statistical population consisted of the companies listed in Tehran Stock Exchange and the time domain is between 2007 and 2016. By choosing Cochran sampling, 126 companies ...

objectives: the present study aimed to provide an estimation of the current financial burden of renal transplantation therapy for insurance organisations.methods: an excel-based model was developed to determine the treatment costs of current clinical practice in renal transplantation therapy (rtt). inputs were derived from ministry of health and insurance organizations` database, hospital and p...

delay in irrigated wheat primary tillage operations causes yield reduction and hidden timeliness cost in fars province. mechanization of primary tillage operations for irrigated wheat in fars province was simulated using system dynamics approach. a part of the model structure was related to the agricultural operations timeliness costs. for the mentioned simulation, causal relations between syst...

this paper seeks to understand the role of the cost of pollution from vehicles fuel in feasibility of cng national plan. optimal control theory is used with two target functions, one with and another without the cost of pollution. model results indicate the high importance of pollution cost in the project feasibility, in such a way that without consideration of that the project will be infeasib...

Cumulative Count of Conforming (CCC) charts are utilized for monitoring the quality characteristics in high-quality processes. Executive cost of control charts is a motivation for researchers to design them with the lowest cost. Usually in most researches, only one objective named cost function is minimized subject to statistical constraints, which is not effective method for economic-statistic...