this article is a comparative study of estimation power of artificial neural networks and autoregressive time series models in inflation forecasting. using 37 years iran’s inflation data, neural networks performs better on average for short horizons than autoregressive models. this study shows usefulness of early stopping technique in learning stage of neural networks for estimating time series...

Considering the network structure is one of the new approaches in studying stochastic PERT networks (SPN). In this paper, planar networks are studied as a special class of networks. Two structural reducible mechanisms titled arc contraction and deletion are developed to convert any planar network to a series-parallel network structure.&#10In series-parallel SPN, the completion time distribution...

background: this study aimed to evaluated trends for iron and manganese concentrations in wells, reservoirs, and water distribution networks in qom city during the summer of 2012. methods: this was a cross-sectional study. the studied scopes consisted of groundwater (60 wells), reservoirs (10 tanks), and water distribution network (33 points). one sample was taken from each source monthly. stat...

autoimmune hepatitis is (aih) is a chronic hepatitis that occurs in children and adults of all ages. it is characterized by immunologic and autoimmune features, including circulating auto antibodies and high serum globulin concentrations. it was first described in the 1950s by term of chronic active hepatitis. it has 2 types with different auto antibodies. diagnosis is based upon serologic and ...

the liver is involved in the synthesis and metabolism of many kinds of hormones, various abnormalities hormone levels are found in advanced liver disease. for example the liver is, extremely sensitive to changes in insulin or glucagon levels. the liver is the primary organ of iron storage is frequently involved, diabetes is common in patients with iron overload and may be seen in cirrhosis. chr...

objectives: homeopathy is the most important field of alternative medicine. at present, over 3000 organic medications have been registered in the homeopathy pharmacopeia; out of which, 70% have herbal, 20% have mineral and the remaining have animal origins. evidence shows that homeopathy may be beneficial in dentistry and oral medicine. however, this is a less known field for dentists. therefor...

background: crohn’s disease is an inflammatory bowel disease that can affect any part of the gastrointestinal (gi) tract including the mouth. bowel symptoms are predominant. oral involvement may precede the gi symptoms. this case report presents a patient affected by crohn’s disease with oral onset. case presentation: we present a 30-year-old pregnant woman complaining of chronic, multiple, yel...

cutaneous leishmaniasis is a common tropical dermatose with diverse clinical presentations. at times, it may appear in unusual shape or unusual site that causes diagnostic challenge. we reported a case of unusual presentation of cutaneous leishmaniasis which appeared as an ulcer on the lower lip of a ten-year-old boy. the diagnosis was confirmed by identifying leishmania parasites at ulcer smea...