TY  - JOUR
AU  - Amaroek, Sanong 
AU  - Theera-Umpon, Nipon 
AU  - Wantanajittikul, Kittichai 
AU  - Auephanwiriyakul, Sansanee 
PY  - 2010
TI  - Moisture Content Prediction of Dried Longan Aril from Dielectric Constant Using Multilayer Perceptrons and Support Vector Regression
JF  - American Journal of Applied Sciences
VL  - 7
IS  - 10
DO  - 10.3844/ajassp.2010.1387.1392
UR  - https://thescipub.com/abstract/ajassp.2010.1387.1392
AB  - Problem statement: Estimation of moisture contents of dried food products from their
dielectric constants was an important step in moisture measurement systems. The regression models
that provide good prediction performance are desirable. Approach: The Multilayer Perceptrons (MLP)
and Support Vector Regression (SVR) were applied in this research to predict the moisture contents of
dried longan arils from their dielectric constants. The data set was collected from 1500 samples of
dried longan aril with five different moisture contents of 10, 14, 18, 22 and 25% Wet basis (Wb.)
Dielectric constant of dried longan aril was measured by using our previously proposed electrical
capacitance-based system. The results from the MLP and SVR models were compared to that from the
linear regression and polynomial regression models. To take into account the generalization of the
models, the four-fold cross validation was applied. Results: For the training sets, the average mean
absolute errors over three bulk densities of 1.30, 1.45 and 1.60 g cm-3 were 1.7578, 0.6157, 0.3812,
0.3113, 0.0103 and 0.0044% Wb for the linear regression, second-, third-, fourth-order polynomial
regression, MLP and SVR models, respectively. For the validation sets, the average mean absolute
errors over the three bulk densities were 1.7616, 0.6192, 0.3844, 0.3146, 0.0126 and 0.0093% Wb for
the linear regression, 2nd, 3rd and 4th-order polynomial regression, MLP and SVR models,
respectively. Conclusion: The regression models based on MLP and SVR yielded better performances
than the models based on linear regression and polynomial regression on both training and validation
sets. The models based on MLP and SVR also provided robustness to the variation of bulk density. Not
only for dried longan aril, the proposed models can also be adapted and applied to other materials or
dried food products.