International Journal of Concrete Structures and Materials

Korea Concrete Institute (한국콘크리트학회)
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Modified Probabilistic Neural Network of Heterogeneous Probabilistic Density Functions for the Estimation of Concrete Strength

  • Kim, Doo-Kie (Dept. of Civil and Environmental Engineering, Kunsan National University) ;
  • Kim, Hee-Joong (Dept. of Civil Engineering, Keimyung University) ;
  • Chang, Sang-Kil (Dept. of Civil and Environmental Engineering, Kunsan National University) ;
  • Chang, Seong-Kyu (Dept. of Civil and Environmental Engineering, Kunsan National University)
  • Published : 2007.03.31
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Abstract

Recently, probabilistic neural network (PNN) has been proposed to predict the compressive strength of concrete for the known effect of improvement on PNN by the iteration method. However, an empirical method has been incorporated in the PNN technique to specify its smoothing parameter, which causes significant uncertainty in predicting the compressive strength of concrete. In this study, a modified probabilistic neural network (MPNN) approach is hence proposed. The global probability density function (PDF) of variables is reflected by summing the heterogeneous local PDFs which are automatically determined by the individual standard deviation of each variable. The proposed MPNN is applied to predict the compressive strength of concrete using actual test data from a concrete company. The estimated results of MPNN are compared with those of the conventional PNN. MPNN showed better results than the conventional PNN in predicting the compressive strength of concrete and provided promising results for the probabilistic approach to predict the concrete strength by using the individual standard deviation of a variable.

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References

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