introduction superficial x-ray therapy is one of the most important treatment methods in radiotherapy especially in the treatment of superficial skin lesions (up to 300 kvp). quality of the x-ray beam that can be expressed by half-value layer (hvl), are important indices for this type of treatment effective energy of photon and homogeneity coefficient (hc). materials and methods the hc of the s...

This paper explores the homogeneity of coefficient functions in nonlinear models with functional coefficients and identifies underlying semiparametric modelling structure. With initial kernel estimates, we combine classic hierarchical clustering method a generalised version information criterion to estimate number clusters, each which has common coefficient, determine membership cluster. To ide...

characteristics of precipitation and the regionalization major role in the efficient use of water resources and soil and management of environmental hazards. regionalization of rainfall can help to better use of water resources and to correct manage of environmental hazards. according to the analysis of climate phenomena such as precipitation, all data should be related to a homogeneous region,...

precipitation regime refers to distribution of seasonal- monthly precipitation. by studying this character, it could be find out about the most important parts of mechanism(s) dominant in temporal distribution of precipitation. precipitation regime can have positive or negative effects on other environmental components performance. in the present research, the monthly data in 73 stations during...

Fabric defect detection algorithm based on local neighborhood is proposed to improve the accuracy and real-time of Fabric defect detection. A local neighborhood window moves over the entire inspection image. For homogeneity measurethe coefficient of variation is used. A defect-free region will generate a smaller value of Variation Coefficient than that of a defective region. To extract and segm...