The aim of this study was to determine the optimal cutting cycle in an uneven-aged beech forest in the North of Iran. First of all, a logistic growth model was determined for an uneven aged forest. Then, the stumpage price was predicted via an autoregressive model. The average stumpage price of beech was derived from actual timber, round wood, fire and pulpwood prices at road side minus the var...

The perceptron algorithm with margins is a simple, fast and effective learning algorithm for linear classifiers; it produces decision hyperplanes within some constant ratio of the maximal margin. In this paper we study this algorithm and a new variant: the perceptron algorithm with uneven margins, tailored for document categorisation problems (i.e. problems where classes are highly unbalanced a...

(1) C. Nal. de Biotecnología, Universidad Autónoma de Madrid, 28049 Madrid, Spain. (2) Department of Radiology, University of Pennsylvania, Blockley Hall, 4 Floor, 423 Guardian Drive, Philadelphia, PA 19104-6021, USA. (3) Max-Planck-Institut fuer medizinische Forschung, Jahnstrasse 29, 69120 Heidelberg, Germany. (4) Groupe d'Analyse des Structures Antigeniques, CNRS, E.P. JO 117, (Campus Medeci...

We construct an efficient 3-source extractor that requires one of the sources to be significantly shorter than the min-entropy of the other two sources. Our extractors work even when the longer, n-bit sources have min-entropy n and the shorter source has min-entropy log n. Previous constructions for independent sources with min-entropy n required Θ(1/γ) sources [Rao06]. Our construction relies ...

This paper proposes an evolvable hardware system with capability of evolution under uneven image environment, which is implemented on reconfigurable field programmable gate array (FPGA) platform with ARM core and genetic algorithm processor (GAP). Parallel genetic algorithm based reconfigurable architecture system evolves image filter blocks to explore optimal configuration of filter combinatio...

While the incidence of extreme poverty fell dramatically in China over 1980–2001, progress was uneven over time and across provinces. Rural areas accounted for the bulk of the gains to the poor, though migration to urban areas helped. Rural economic growth was far more important to national poverty reduction than urban economic growth; agriculture played a far more important role than the secon...

The surface V3 of the denuded corneal stroma was separated into the anterior and posterior segments; the swelling ratio of each was compared under zero pressure. In the rabbit, cat, and bovine corneas, the anterior segment was less hydrophilic than the posterior one, in both the central and peripheral regions. In the rabbit cornea, the swelling ratio of the posterior segment was significantly l...

UNLABELLED Genetic robustness (tolerance of mutation) may be a naturally selected property in some viruses, because it should enhance adaptability. Robustness should be especially beneficial to viruses like HIV-1 that exhibit high mutation rates and exist in immunologically hostile environments. Surprisingly, however, the HIV-1 capsid protein (CA) exhibits extreme fragility. To determine whethe...

UNLABELLED BACKGROUND No large scale studies on breastfeeding onset patterns have been carried out in Spain. This work aims to explore the prevalence and the risk factors for not initiating breastfeeding in hospitals from Catalonia (CAT) and Valencia (V), two regions accounting approximately for 30% of the annual births in Spain. METHODS The prevalence of not initiating breastfeeding was c...