Replacing fossil fuel with biofuel is environmentally viable from a climate change perspective only if the net greenhouse gas (GHG) footprint of the system is reduced. The effects of replacing annual arable crops with perennial bioenergy feedstocks on net GHG production and soil carbon (C) stock are critical to the system-level balance. Here, we compared GHG flux, crop yield, root biomass, and ...

Material control schemes can be classified as push, pull, or hybrid strategies. This paper compares the performance of MRP (push) and kanban (pull) for a multi-stage, multiproduct manufacturing system. Using simulation experiments we analyze system performance under different product mixes and observe that in certain environments with advance demand information kanban-based pull strategies can ...

We address a multi-item capacitated lot-sizing problem with setup times, safety stock and demand shortages. Demand cannot be backlogged, but can be totally or partially lost. Safety stock is an objective to reach rather than an industrial constraint to respect. The problem is np-hard. We propose a Lagrangian relaxation of the resource capacity constraints. We develop a dynamic programming algor...

A single-product inventory control model with different distributions of demand for goods and random lead time is considered. The proposed model uses the regenerative approach. It gives possibility to find optimal values of reorder point and order quantity. Criterion of optimization is minimum of average expenses for goods holding, ordering and losses from deficit per a time unit. Suggested mod...

Published online ahead of print: J Clin Psychiatry September 9, 2008: e1–e10 (pii: ej08m04166). Available at PSYCHIATRIST.COM © Copyright 2008 Physicians Postgraduate Press, Inc. e1 ttention-deficit/hyperactivity disorder (ADHD) is one of the most common psychiatric disorders, Double-Blind, Placebo-Controlled Study of the Efficacy and Safety of Lisdexamfetamine Dimesylate in Adults With Attenti...