Lead: Dangerous Wait

To wait or not to wait: Optimal ordering under lead time uncertainty and forecast updating

There has been a dramatic increase over the past decade in the number of firms that source finished product from overseas. While this has reduced procurement costs, it has increased supply risk; procurement lead times are longer and are often unreliable. In deciding when and how much to order, firms must consider the lead time risk and the demand risk, i.e., the accuracy of their demand forecas...

Blood lead level in opium abuse. Which is more dangerous? Opium smoking or opium ingestion?

A lead-time based approach for planning rail-truck intermodal transportation of dangerous goods

Extraction of abandoned, potentially dangerous lead with uncovered proximal ending: a case report and method description.

In this study, we present the case of the extraction of a non-functioning, abandoned, chronically implanted nine year-old lead with proximal extended frayed ending, displaced spontaneously into the subclavian vein. The seemingly inaccessible lead was extracted from the body using the femoral approach. The lead was looped with a pig-tail catheter, standard guide-wire, and basket Dotter catheter,...

Online Train Disposition: To Wait or Not to Wait?

We deal with an online problem arising from bus/tram/train disposition problems. In particular, we look at the case in which the delay is unknown and the vehicle can only wait in a station so as to minimize the passengers’ waiting time. We present deterministic polynomial-time optimal algorithms and matching lower bounds for several problem versions. In addition, all lower bounds also apply to ...