This paper is concerned with joint determination of the optimal lot size and optimal number of shipments for an economic production quantity (EPQ) model with the reworking of random defective items produced. The classic EPQ model assumes a continuous issuing policy for satisfying product demand and perfect quality production for all items produced. However, in a real life vendor-buyer integrate...

In this paper we consider a stochastic multi item inventory problem. A retailer sells multiple products with stochastic demand and is replenished periodically from a supplier with ample stock. At each order instant it is decided which product to order and how much to order. For the delivery of the products trucks with a finite capacity are available. The dispatched trucks arrive at the retailer...

OBJECTIVES To document and characterize freezing temperatures in the Indonesian vaccine cold chain and to evaluate the feasibility of changes designed to reduce the occurrence of freezing. METHODS Data loggers were used to measure temperatures of shipments of hepatitis B vaccine from manufacturer to point of use. Baseline conditions and three intervention phases were monitored. During each of...

Shipments of 50,000 commercially reared Aphytis melinus DeBach were obtained from each of the five insectaries that produce and sell this parasitoid to citrus growers in California for control of California red scale, Aonidiella aurantii (Maskell). Shipments were received from each insectary every 2 mo over a period of a year to assess variability in quality through time and between insectarie...

Mexico has set a desirable 50% reduction goal of Greenhouse Gas emissions by 2050, compared to the 2000 baseline. In this regard, all the activity sectors, including universities and research institutions, are encouraged to adopt similar targets. As a contribution to the national efforts on the subject, this paper presents the 2010 Greenhouse Gas emission inventory of the Institute of Engineeri...

A number of stylized facts have been documented about the extensive margin of trade— whether to export or not, and, if so, how many products to how many destinations. We note that some of the reported facts would be expected to arise if exports shipments were randomly allocated across categories (e.g., product codes, destination countries). ey are, thus, not informative of the underlying econom...

Multi-echelon distribution networks are quite common in supply chain and logistics. Deliveries of multiple items from factories to customers aremanagedby routing and consolidating shipments inwarehouses carrying on long-term inventories. On the other hand, cross-docking is a logistics technique that differs from warehousing because products are no longer stored at intermediate depots. Instead, ...

International cooperation will be critical to solving the world's toughest environmental problems, including climate change, ozone depletion, and biodiversity. Regrettably, most evidence suggests that the 1,000 or so different International Environmental Agreements (IEAs) operating today are ineffectual, merely ratifying business-as-usual outcomes and doing little to improve the environment. Bu...

Live pig trade patterns, drivers and characteristics, particularly in backyard predominant systems, remain largely unexplored despite their important contribution to the spread of infectious diseases in the swine industry. A better understanding of the pig trade dynamics can inform the implementation of risk-based and more cost-effective prevention and control programs for swine diseases. In th...