For the (S − 1, S) lost sales inventory model with several demand classes that have different lost sale penalty cost, three accurate and efficient heuristic algorithms are presented that, at a given base stock level, aim to find optimal values for the critical levels, i.e., values that minimize inventory holding and penalty cost.

The aim of this study was to determine how sense of control and intrinsic motivation are related to university students' motivational structure and alcohol consumption. Participants were 94 university students who completed the Personal Concerns Inventory, Shapiro Control Inventory, Helplessness Questionnaire, Intrinsic-Extrinsic Aspirations Scale, and Alcohol Use Questionnaire. Results showed ...

Conventional wisdom has it that inventory investment destabilizes the economy because it is procyclical to sales. Khan and Thomas (2007) show that the conventional wisdom is wrong in a general equilibrium (S,s) model with capital. We argue that their …nding is not robust— the conventional wisdom can still hold in general equilibrium if …rms can adjust output by varying the capacity utilization ...

We analyze an infinite horizon, single product, continuous review model in which pricing and inventory decisions are made simultaneously and ordering cost includes a fixed cost. We show that there exists a stationary (s, S) inventory policy maximizing the expected discounted or expected average profit under general conditions. © 2005 Elsevier B.V. All rights reserved.

This study aimed to investigate the relationship between chronic fatigue syndrome (CFS) and depression with the mediating role of executive functions (EFs) in patients with relapsing-remitting multiple sclerosis (RRMS). The statistical population of this descriptive correlational study included all patients with RRMS who were referred to Tehran neurologists in the summer of 2021 and among them,...

We develop an equilibrium business cycle model where nonconvex delivery costs lead producers of final goods to follow generalized (S,s) inventory policies with respect to intermediate goods. When calibrated to match the average inventory-to-sales ratio in postwar U.S. data, our model reproduces two-thirds of the cyclical variability of inventory investment. Moreover, inventory accumulation is s...

Background and purpose: The study about effective management dimensions in hospital staff performance is important. This study was done to survey the relationship between job satisfaction and burnout in the rehabilitation personnel of Razi Psychiatric Hospital in Tehran. Materials & Methods: In this cross-sectional study, 77 subjects including psychometrics, general practitioners, specialists, ...