Abstract The pilgrimage to Mecca, which is called Hajj, the largest annual pedestrian crowd management problem in world. During pilgrims are accommodated camps. For safety reasons, exact times and directions given who moving between holy sites. Despite importance of complying with those schedules, violations can often be conjectured. Directing a small workforce camps monitor pilgrims’ complianc...

In this paper we present a model and solution procedures of the Inventory Routing Problem (IRP) encountered in vending machine supply chains working under vendor-managed inventory (VMI) scheme. The new IRP model is built based on the existing Periodic Vehicle Routing Problem with Time-windows (PVRPTW). The model will be referred to as the Integrated Inventory and Periodic Vehicle Routing Proble...

The Vehicle Routing Problem with Time Windows (VRPTW) is a well-studied capacitated vehicle routing problem where the objective is to determine a set of feasible routes for a fleet of vehicles, in order to serve a set of customers with specified time windows. The ultimate optimization objective is to minimize the total travelling time of the vehicles. This paper presents a new hybrid heuristic ...

Vehicle routing problems have various extensions such as time windows, multiple vehicles, backhauls, simultaneous delivery and pick-up, etc. The objectives of all these problems are to design optimal routes minimizing total distance traveled, minimizing number of vehicles, etc that satisfy corresponding constraints. In this study, an ant colony optimization based heuristic that can be used to s...

We present a modification of the vehicle routing problem with the additional restriction that time windows are associated with each customer by defining an interval wherein the customer has to be supplied. We introduce a two phase strategy of this vehicle routing and scheduling problem with time windows using fuzzy logic to realize inference steps in fuzzy if-then rule bases.

customer service level is of prime importance in today competitive world and has various dimensions with delivery quality being one of the most important ones. delivery quality has several parameters such as deliver time window options, time window size, etc. in this paper we focus on one of these parameters, namely time window setting. it has a direct impact upon customer satisfaction and busi...

In this paper, we address vehicle routing and crew scheduling problems that can be solved by a branch-and-price approach where the column generation subproblem corresponds to a shortest path problem with or without resource constraints. As surveyed in [1] and [2], branch-and-price approaches have been successfully used to solve a wide variety of vehicle routing and crew scheduling applications ...