Sustainable forest management is concerned with the management of forests according to the principles of sustainable development. As a contribution to the field, this paper combines the Vehicle Routing Problem (VRP) (in which the vehicles are harvesters) with the Multiple Stock Size Cutting Stock Problem under uncertainty (in which the stock is logs). We present an Integer Linear Program that dynamically combines the cutting of the uncertain stock with vehicle routing, and uses it to address real-life problems.
View Article and Find Full Text PDFThis paper presents a new class of multiple-follower bilevel problems and a heuristic approach to solving them. In this new class of problems, the followers may be nonlinear, do not share constraints or variables, and are at most weakly constrained. This allows the leader variables to be partitioned among the followers.
View Article and Find Full Text PDFObjective: To analyze if there are urodynamic differences in patients with neurogenic detrusor overactivity (NDO) secondary to spinal cord injury (SCI) depending on whether the SCI is complete or incomplete according to the American Spinal Injury Association (ASIA) classification.
Methods: A retrospective and comparative study was carried out, including 194 patients with suprasacral SCI and NDO. Maximum cystometric capacity (MCC), volume at first involuntary contraction (VIC), compliance, maximum pressure of the detrusor during filling cystometry (MaxDetP), detrusor leak point pressure (LeakDetP) and postvoid residual urine volume (PVR) were analysed.
Introduction: Urinary lithiasis involves a major source of morbidity and economic costs. The aim of this study was to evaluate the adherence to the European Association of Urology Guidelines on Urolithiasis with regard to treatment among Spanish urologists.
Methods: A total of 723 patients were included in a prospective study between May 1, 2014, and July 31, 2014.