The present study seeks to examine the factors affecting information search of heads of households in purchasing an outbound package tour. A sample of 60 academics and non-academics in the field of tourism was chosen. Sampling methods were judgmental and snowball sampling. In order to gather data, we used a semi-structured interview.  Thematic analysis was applied for data analysis, and the col...

This paper considers a time dependent(the travel time is not constant throughout the day) pollution routing problem (TDPRP), which aids the decision makers in minimizing travel time, toll cost and emitted pollution cost.  In complexity of urban areas most of the time one point is accessible from another with more than one edge. In contrast to previous TDPRP models, which are designed with only ...

This paper aims to study the locomotive routing problem (LRP) which is one of the most important problems in railroad scheduling in view of involving expensive assets and high cost of operating locomotives. This problem is assigning a fleet of locomotives to a network of trains to provide sufficient power to pull them from their origins to destinations by satisfying a rich set of operational con...

Introduction: An important issue associated with old age is how to spend the leisure, which can help preserve independence, bring happiness and vitality and reduce mental disorders and indifference. Therefore, the present study aimed to investigate how older adults spend their leisure time. Methods: The cross-sectional study was conducted with 270 elderly participants (> 60 years) in Yazd city...

nowadays, the environmental impact of transportation project and, especially air pollution impacts, are major concerns in evaluating transportation projects. based on this concern, beside definition of traditional objective functions like total travel time and total investment cost, different type of environmental related function is considered as objective function in urban network design. in...