Designing multi-vehicle delivery tours in a grid-cell format

Article Abstract:

A study investigated the vehicle routing problem with stochastic demands for a heterogeneous region requiring multi-delivery tours services. Density of service points, amount of cargo, customer demands and service times vary over this urban region, which in partitioned into sectors, rings and districts, with the polar coordinates centered at the depot. The analysis presented an approximate method to define districts linked to the urban distribution of goods and to aid in the design of multi-delivery tours associated with goods distribution. It also explores best vehicle size.

Production Planning & Control, Usage, Mathematical models, Production control, Delivery of goods, Deliveries (Transportation), Mathematical optimization, Optimization theory, Production planning, Zoning

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Multi-echelon inventory control in divergent systems with shipping frequencies

Article Abstract:

The costs of holding inventory at the central and local stockpoints may be minimized by incorporating demand, service, lead time characteristics, as well as different shipment frequencies in the distribution model. In a two-echelon distribution network, products go through one central depot and multiple local stockpoints from the supplier to the customer. In this case, financial risk from the allocation of replenishment order may be reduced by considering the lead time or the replenishment cycle.

Distribution Channels, Cost Control Techniques, Cost control

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A perishable inventory model with positive order lead times

Article Abstract:

The total inventory cost for perishable products with a two period lifetime, subject to an order lead time, may be minimized by considering the optimal incoming quantity and the lead time. The optimal incoming quantity is constant, as this function is not affected by the lead time. Generally, however, the optimal incoming quantity relies on the lead time. It is better to cease to order when the total inventory during the starting period is greater than a predetermined constant.

Management, Perishable goods

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