It is observed that the separated design of location for depots and routing for servicing customers often reach a suboptimal solution. So, solving location and routing problem simultaneously could achieve better results. In this paper, waste collection problem is considered with regard to economic and societal objective functions. A non-dominated sorting genetic algorithm (NSGA-II) is used to l...

The single vehicle routing problem with multiple routes is a variant of the vehicle routing problem where the vehicle can be dispatched to several routes during its workday to serve a number of customers. In this paper we propose a goal programming model for multi-objective single vehicle routing problem with time windows and multiple routes. To solve the model, we present a heuristic method wh...

the heterogeneous fixed fleet open vehicle routing problem (hffovrp) is one of the most significant extension problems of the open vehicle routing problem (ovrp). the hffovrp is the problem of designing collection routes to a number of predefined nodes by a fixed fleet number of vehicles with various capacities and related costs. in this problem, the vehicle doesn’t return to the depot after se...

The generalized multiple depot traveling salesmen problem (GMDTSP) is a variant of the multiple depot traveling salesmen problem (MDTSP), where each salesman starts at a distinct depot, the targets are partitioned into clusters and at least one target in each cluster is visited by some salesman. The GMDTSP is an NP-hard problem as it generalizes the MDTSP and has practical applications in desig...

Population in cities is increasing very rapidly and hence demand of utility commodities is also increasing day by day. There is a need for the fleets of vehicles to deliver goods and material from distribution centres to local consumer locations within optimal travel distance and time. In this study, the above transportation problem have been tackled by solving the vehicle routing problem for t...

Home health care structures provide for the elderly, people with disabilities as well patients chronic conditions. Since there has been an increase in demand, organizations providing home are eager to optimize their activities. In addition, patient numbers led expand geographical reach. As a result, tend be located different offices limit travel time and, consequently, caregivers employed by th...

This research addresses an empirical multi-depot vehicle routing case for a fixed-route trucking carrier. In this case, the characteristics of vehicle routing problems, including multi-depots, dispatching quantity, routes arrangement and time-window constraints, are considered in order to reduce the delivering cost. A hybrid heuristic algorithm is developed in order to solve this practical prob...

Industrial hazardous materials (hazmat) are byproduct of industrial production and include hazardous goods, such as flammable, toxic and corrosive materials that pose a risk to the environment.Hazardous waste management includes collection, transportation, treatment, recycling and disposal of industrial hazardous material in an organized manner. With the increasing industrialization of countrie...