We present a general framework for modeling routing problems based on formulating them as a traditional location problem called the Capacitated Concentrator Location Problem. We apply this framework to two classical routing problems: the Capacitated Vehicle Routing Problem and Inventory-Routing Problem. In the former case, the heuristic is proven to be asymptotically optimal for any distributio...

Liquefied natural gas (LNG) is natural gas that has been transformed to liquid form for the purpose of transportation, which is mainly done by specially built LNG vessels travelling from the production site to the consumers. We describe a real-life ship routing and scheduling problem from the LNG business, with both inventory and berth capacity constraints at the liquefaction port. We propose a...

In the case of hazardous materials management, selected routes for carrying hazardous materials (i.e., hazmat) have significant effects on locating hazmat distribution centers. Since, risk and cost are usually considered as two main attributes to determine the best routes, optimized locations are sequentially outlined depending on selected routes. In the present paper, t...

Transportation in economic systems such as services, production and distribution enjoys a special and important position and provides a significant portion of the country's gross domestic product. Improvements in transportation system mean improvements in the traveling routes and the elimination of unnecessary distances in any system. The Vehicle Routing Problem (VRP) is one of the practical co...

The purpose of this article is to model and solve an integrated location, routing and inventory problem (LRIP) in cash-in-transit (CIT) sector. In real operation of cash transportation, to decrease total cost and to reduce risk of robbery of such high-value commodity. There must be substantial variation, making problem difficult to formulate. In this paper, to better fit real life applications ...

A traditional logistics decision model mainly studies the location of distribution centers, storage inventory management, vehicle scheduling, and transportation routes. The location-inventory-routing problem (LIRP) is an integrated optimization three problems—a comprehensive for whole system. This review paper uses PRISMA (Preferred Reporting Items Systematic Reviews Meta-Analysis) method to li...

In this paper, we present a problem in international shipping which combines the ship routing problem with inventory considerations. A fleet of ships is responsible for the transportation of a given commodity between a supply port and the demand ports. Their routes should be selected so that the total transportation cost and the inventory cost is minimized. Although a generic mixedinteger progr...

In this work we propose two memetic algorithms based on a Nondominated Sorting Genetic Algorithm II (NSGA-II) scheme for solving a bi-objective Transportation Location Routing Problem (TLRP). The TLRP we are dealing with, can be seen as an extension of the two stage Location Routing Problem, with a transportation problem with truck capacity as first stage. Two objectives are considered: minimiz...

The location-routing problem (LRP), which integrates location and routing decisions, has been an attraction to both researchers and practitioners. LRP as an important business problem has its own inherent uncertainty; especially, considering phenomena such as traffic congestion and weather conditions and their impact on transportation costs, routing in LRP is subject to uncertainty. In this pap...