This study used quantifying factors affecting desertification based on the Iranian model of desertification potentialassessment (IMDPA) to assess the current status of desertification in Bordekhun region, Iran. Bordekhun region has anarea of 214.11 km2 and is located near the city of Daiyer in Boushehr province. First, a working unit map of the regionwas selected as the basic map for evaluation...

A race-like model is developed to account for various phenomena arising in simple reaction time (RT) tasks. Within the model, each stimulus is represented by a number of grains of information or activation processed in parallel. The stimulus is detected when a criterion number of activated grains reaches a decision center. Using the concept of statistical facilitation, the model accounts for ma...

Some studies suggest that fishery yields can be higher with reserves than under conventional management. However, the economic performance of fisheries depends on economic profit, not fish yield. The predictions of higher yields with reserves rely on intensive fishing pressures between reserves; the exorbitant costs of harvesting low-density populations erode profits. We incorporated this effec...

Open source software (OSS) has become an increasingly threatening competitor to traditional proprietary software. In this paper, we study the competition between proprietary and OSS by considering consumer’s taste difference using a Hotelling model. In particular, we seek to answer how commercial software vendors should optimally set the price and design its product. Our analysis suggests that ...

In the usual optical ow detection, the gradient constraint, which expresses the relationship between the gradient of the image intensity and its motion, is combined with the least-squares criterion. This criterion means assuming that only the time derivative of the image intensity contains noise. In this paper, we assume that all image derivatives contain noise and derive a new optical ow detec...

Ss responded to a 1,000-Hz tone of 50, 80, or 100 dB. Catch trial conditions were none, blank trials, a red light, a noise, and an 1,800-Hz tone. Auditory catch signals were of the same intensities. RT distributions in the first three conditions were well described by a family of exponential growth functions dependent upon stimulus intensity and by the parameters of normal criterion distributio...

The supply of wood for energy is challenging due to high supply costs and rapidly increasing demand. As an important quality criterion, moisture content (MC) influences the revenues, demand and supply costs. For transport, the limiting factor is payload, if the MC is high. The effects of MC on costs and greenhouse gas (GHG) emissions for an optimized supply network have been analyzed using a pr...

The aim of our research is to analyse the importance of texture information for affine registration of gray-scale far-infrared (FLIR) images and gray-scale images taken in the visible spectrum. Texture features are extracted by Laws texture coefficients and used for computing registration criterion functions. The proposed feature based approach is compared to the commonly used approach, where a...

Three Maximum-Likelihood thresholding algorithms based on population mixture models are investigated and a criterion is introduced for automatic selection of the most suitable Maximum-Likelihood thresholding algorithm for extracting object from their background in an arbitrary still image. The most suitable algorithm is that whose population mixture model approximates better the probability den...