This paper should be of interest to the combinatorial optimization community and especially to those interested in the Quadratic Assignment Problem (QAP). The QAP has application in the assignment of facilities to locations (to minimize the cost of intrafacility transportation), the placement of electronic components (to minimize the length of interconnecting wire), the placement of blades in a...

In this paper a two-level hierarchical model for the location of concentrators and routers in computers networks is presented. Given a set of candidate locations and the capacities of concentrators and routers the problem is to determine how many concentrators and routers should be used, where they should be located and which users to assign to each concentrator and which concentrators to alloc...

The present study was an attempt to determine a relationship between foreign language reading anxiety and reading strategy use among a group of EFL Iranian readers (no = 100) with low vs. high proficiency levels. To this end, FLRAS (Foreign Language Reading Anxiety Scale) developed by Saito, Horwitz, and Garza, (1999) was used in order to measure the participants’ level of anxiety in reading an...

This study concentrates on designing a medical waste management system with a hierarchical structure, including a local government and a waste management planner. The upper-level seeks to design and control the waste management facilities by minimizing the environmental risks related to the disposal of medical waste. While the lower-level model is to determine the waste collection plans by only...

The facility location problem is a strategic decision-making for a supply chain, which determines the profitability and sustainability of its components. This paper deals with a scenario where two supply chains, consisting of a producer, a number of distribution centers and several retailers provided with similar products, compete to maintain their market shares by opening new distribution cent...

Objectives: This study aimed to investigate the level of problem-solving skills in 1-4 year-old children with early treated phenylketonuria (ETPKU). Methods:This analytic, cross-sectional study was conducted on 70 1-4 year-old children referred to phenylketonuria (PKU) clinics that had been diagnosed on screening at birth and had been treated. The measurements were a demographic questionnair...

objectives: this study aimed to investigate the level of problem-solving skills in 1-4 year-old children with early treated phenylketonuria (etpku). methods:this analytic, cross-sectional study was conducted on 70 1-4 year-old children referred to phenylketonuria (pku) clinics that had been diagnosed on screening at birth and had been treated. the measurements were a demographic questionnaire, ...

 We consider generalized semi-infinite programming problems in which the index set of the inequality constraints depends on the decision vector and all emerging functions are assumed to be convex. Considering a lower level constraint qualification, we derive a formula for estimating the subdifferential of the value function. Finally, we establish the Fritz-John necessary optimality con...