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1 " " ١* / / : / / :... ( (GIS) ). ( ). (MLP) ) ١ dianatig@modares.ac.ir : ١۵٣

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9 .. ( ) -.. ( ) ( ).(Nielsen et al., 1990) (Rsqr) : (MSE) (MSE) ( Pi Pi) MSE = n Rsqr = [ n n i= 1 ( Pi Pi).( Pˆi P ~ i) n ( Pˆi P ~ i) (Rsqr) ] ( Pi Pi). i= 1 i= 1 Pi P ~ i Pi n Pˆi.. ).(. ). ( 10 Mean Squared Error 11 Coefficient of correlation ١۶١

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22 1397 / Aeinebeygi, S., Khaleghi, M.R An Assessment of Biennial Enclosure Effects on Range Production, Condition and Trend (Case Study: Taftazan Rangeland, Shirvan). International Journal of Forest, Soil and Erosion (IJFSE), 6(2): Blanco, P., Delvalle, H.F., Bouza, P., Metternicht, G.I., Hardtke Ecological site classification of semiarid rangelands: Synergistic use of Landsat and Hyperion imagery, International Journal of Applied Earth Observation and Geoinformation,29(1): Barr, T Application of tools for hydraulic power point presentation.105- uppergotvand hydroelectric power project feasibility study Reservior Operation Flood.14p. Dayhoff, J Natural Networks archictures: Anintroduction. New Yourk: Van NostrandReinhold. Gangopadhyay, S., Gautam, T., Gupta, A Subsurface characterization using artificial neural network and GIS Journal of Computing in Civil Engineering, Co13(3): Gholami, V., Chau, K.W., Fadaee, F., Torkaman, J., Ghaffari, A Modeling of groundwater level fluctuations using dendrochronology in alluvial aquifers.journal of Hydrology,529: Hill, M Flood plain delineation using the HEC-GeoRAS Extention for Arcview. Brigham Young University, 514p. Jafari, M., Zare Chahouki, M.A., Tavili, A., Azarnivand, H., Zahedi Amiri, G.H Effective environmental factors in the distribution of vegetation types in Poshtkouh rangelands of Yazd Province (Iran). Journal of Arid Environments, 56(4): Krishna, B., Styaji Rao, Y.R., vijaya, T Modeling ground water levels in an urban coastal aquifer using artificial neural networks. Journal of Hydrological process, 22(8): Krishna, M., Neaupane, M.D., Moqbul, H Predicting Arsenic Concentration in groundwater using GIS-ANN hybrid system, 3rd IASME / WSEAS Int. Conf. on water resources, Hydraulics and Hydrolgeology (WHH '08), University of Cambridge, UK, Feb , Nielsen, H. R Neurocomputing. Addison-Wesley Publ. Co., Reading, MA. McCoord, N.M., Illingworth, W.T A practical guide to neural nets. Addison- Wesley, Publ. Co. the University of Michigan, 344p. ١٧۴

23 Maier, H., Dandy, G Neural networks for the perdictions and forecasting of water resources variables: review of modeling issues and applications. Environmental Modelling and Software, 15; Melesse, A. M., Hanley, R. S Artificial neural network application for multiecosystem carbon flux simulation. Ecological Modelling, 189, Zare Chahouki, M.A., KhalasiAhvazi, L., Azarnivand, H Comparison of three modeling approaches for predicting plant species distribution inmountainous scrub vegetation (Semnan ranglands, Iran). Polish Journal of ecology, 60 (2): ١٧۵

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