scholarly journals Estimation of Contact Tip to Work Distance (CTWD) using Artificial Neural Network (ANN) in GMAW

2019 ◽  
Vol 269 ◽  
pp. 04004
Author(s):  
Fuad Mahfudianto ◽  
Eakkachai Warinsiriruk ◽  
Sutep Joy-A-Ka

A method for optimizing monitoring by using Artificial Neural Network (ANN) technique was proposed based on instability of arc voltage signal and welding current signal of solid wire electrode (GMAW). This technique is not only for effective process modeling, but also to illustrate the correlation between the input and output parameters responses. The algorithms of monitoring were developed in time domain by carrying out the Moving Average (M.A) and Root Mean Square (RMS) based on the welding experiment parameters such as travel speed, thickness of specimen, feeding speed, and wire electrode diameter to detect and estimate with a satisfactory sample size. Experiment data was divided into three subsets: train (70%), validation (15%), and test (15%). Error back-propagation of Levenberg-Marquardt algorithm was used to train for this algorithm. The proposed algorithms on this paper were used to estimate the variety the Contact Tip to Work Distance (CTWD) through Mean Square Error (MSE). Based on the results, the algorithms have shown that be able to detect changes in CTWD automatically and real time with takes 0.147 seconds (MSE 0.0087).

Author(s):  
Nisha Thakur ◽  
Sanjeev Karmakar ◽  
Sunita Soni

The present review reports the work done by the various authors towards rainfall forecasting using the different techniques within Artificial Neural Network concepts. Back-Propagation, Auto-Regressive Moving Average (ARIMA), ANN , K- Nearest Neighbourhood (K-NN), Hybrid model (Wavelet-ANN), Hybrid Wavelet-NARX model, Rainfall-runoff models, (Two-stage optimization technique), Adaptive Basis Function Neural Network (ABFNN), Multilayer perceptron, etc., algorithms/technologies were reviewed. A tabular representation was used to compare the above-mentioned technologies for rainfall predictions. In most of the articles, training and testing, accuracy was found more than 95%. The rainfall prediction done using the ANN techniques was found much superior to the other techniques like Numerical Weather Prediction (NWP) and Statistical Method because of the non-linear and complex physical conditions affecting the occurrence of rainfall.


2015 ◽  
Vol 27 (3) ◽  
pp. 217-225 ◽  
Author(s):  
Muhammed Yasin Çodur ◽  
Ahmet Tortum

This study presents an accident prediction model of Erzurum’s Highways in Turkey using artificial neural network (ANN) approaches. There are many ANN models for predicting the number of accidents on highways that were developed using 8 years with 7,780 complete accident reports of historical data (2005-2012). The best ANN model was chosen for this task and the model parameters included years, highway sections, section length (km), annual average daily traffic (AADT), the degree of horizontal curvature, the degree of vertical curvature, traffic accidents with heavy vehicles (percentage), and traffic accidents that occurred in summer (percentage). In the ANN model development, the sigmoid activation function was employed with Levenberg-Marquardt algorithm. The performance of the developed ANN model was evaluated by mean square error (MSE), the root mean square error (RMSE), and the coefficient of determination (R2). The model results indicate that the degree of vertical curvature is the most important parameter that affects the number of accidents on highways.


2007 ◽  
Vol 353-358 ◽  
pp. 2325-2328
Author(s):  
Zi Chang Shangguan ◽  
Shou Ju Li ◽  
Mao Tian Luan

The inverse problem of rock damage detection is formulated as an optimization problem, which is then solved by using artificial neural networks. Convergence measurements of displacements at a few of positions are used to determine the location and magnitude of the damaged rock in the excavation disturbed zones. Unlike the classical optimum methods, ANN is able to globally converge. However, the most frequently used Back-Propagation neural networks have a set of problems: dependence on initial parameters, long training time, lack of problemindependent way to choose appropriate network topology and incomprehensive nature of ANNs. To identify the location and magnitude of the damaged rock using an artificial neural network is feasible and a well trained artificial neural network by Levenberg-Marquardt algorithm reveals an extremely fast convergence and a high degree of accuracy.


The Winners ◽  
2008 ◽  
Vol 9 (2) ◽  
pp. 112
Author(s):  
Harjum Muharam ◽  
Muhammad Panji

This paper discusses technical analysis widely used by investors. There are many methods that exist and used by investor to predict the future value of a stock. In this paper we start from finding the value of Hurst (H) exponent of LQ 45 Index to know the form of the Index. From H value, we could determinate that the time series data is purely random, or ergodic and ant persistent, or persistent to a certain trend. Two prediction tools were chosen, ARIMA (Auto Regressive Integrated Moving Average) which is the de facto standard for univariate prediction model in econometrics and Artificial Neural Network (ANN) Back Propagation. Data left from ARIMA is used as an input for both methods. We compared prediction error from each method to determine which method is better. The result shows that LQ45 Index is persistent to a certain trend therefore predictable and for outputted sample data ARIMA outperforms ANN.


2020 ◽  
Vol 16 (8) ◽  
pp. 1083-1092
Author(s):  
Mojtaba Mohammadpoor ◽  
Roya Mohammadzadeh Kakhki ◽  
Hakimeh Assadi

Background:: Simultaneous determination of medication components in pharmaceutical samples using ordinary methods have some difficulties and therefore these determinations usually were made by expensive methods and instruments. Chemometric methods are an effective way to analyze several components simultaneously. Objective:: In this paper, a novel approach based on Bayesian regularized artificial neural network is developed for the determination of Loratadine, Naproxen, and Diclofenac in water using UV-Vis spectroscopy. Methods: A dataset is collected by performing several chemical experiments and recording the UV-Vis spectra and actual constituent values. The effect of a different number of neurons in the hidden layer was analyzed based on final mean square error, and the optimum number was selected. Principle Component Analysis (PCA) was also applied to the data. Other back-propagation methods, such as Levenberg-Marquardt, scaled conjugate gradient, and resilient backpropagation, were tested. Results:: In order to see the proposed network performance, it was performed on two crossvalidation methods, namely partitioning data into train and test parts, and leave-one-out technique. Mean square errors between expected results and predicted ones implied that the proposed method has a strong ability in predicting the expected values. Conclusion:: he results showed that the Bayesian regularization algorithm has the best performance among other methods for simultaneous determination of Loratadine, Naproxen, and Diclofenac in water samples.


Author(s):  
EFRAIN LUJANO LAURA ◽  
APOLINARIO LUJANO ◽  
JOSÉ PITÁGORAS QUISPE ◽  
RENÉ LUJANO

<h4 class="text-primary">Resumen</h4><p style="text-align: justify;">La presente investigación se realizó en la cuenca del río Ilave, ubicado dentro de la región Hidrográfica del Titicaca (Perú), teniendo como objetivo pronosticar los caudales medios mensuales del rio Ilave usando Modelos de Redes Neuronales Artificiales, aplicado al problema del pronóstico mensual de esta variable, cuyo resultado puede emplearse en la planificación y gestión de los recursos hídricos en cuencas hidrográficas. La información hidrometeorológica utilizada, corresponde al Servicio Nacional de Meteorología e Hidrología con un periodo de registro de 1965 al 2007, de donde se plantearon 06 modelos que están en función de precipitaciones y caudales, cuya fase de entrenamiento, validación y prueba, se realizaron con el 70%, 15% y 15% del total de datos respectivamente, con una red de entrenamiento designada Perceptrón Multicapa (MLP) y el algoritmo «back-propagatión». La significación estadística de los indicadores de desempeño de eficiencia de Nash-Sutcliffe (NSE) y la raíz del error cuadrático medio (RMSE), fueron evaluados usando el método de bootstrap incorporado en el código FITEVAL y como indicadores complementarios de evaluación tradicional, el coeficiente de determinación (R2) y el error cuadrático medio normalizado (ECMN). Los resultados de validación y prueba indican calificativos de buenos a muy buenos, así tenemos que en la fase de pronóstico para los modelos seleccionados MRNA5, MRNA2 y MRNA3, los coeficientes de Eficiencia de Nash-Sutcliffe son de 88.0%, 87.9% y 87.1%; la raíz del error medio cuadrático son de 18.87%, 18.96% y 19.56% respectivamente. Se concluye que el pronóstico de caudales medios mensuales del río Ilave utilizando modelos de Redes Neuronales Artificiales, muestran un buen desempeño en la estimación de fenómenos de comportamiento no lineal como los caudales.</p><p><strong>PALABRAS CLAVE: </strong>* Backpropagation * caudales medios * redes neuronales artificiales río * Ilave</p><h4 class="text-primary">ABSTRACT</h4><p><strong>AVERAGE FLOW-MONTHLY FORECAST OF THE ILAVE RIVER USING ARTIFICIAL NEURAL NETWORK MODELS</strong></p><p style="text-align: justify;">This research was conducted in the Ilave river basin located within the hydrographic region of Titicaca (Peru), aiming to predict the average monthly flow of the river Ilave usingArtificial Neural Networks models applied to forecast the monthly variable flow of this river. The results of this type of forecasting can be used in the planning and management of water resources in river basins. The hydrometeorological information used, corresponds to the National Meteorological and Hydrological Service registries between 1965 – 2007. 06 models were proposed that are based on rainfall and river flow, whose training, validation and testing phases were realized with 70%, 15% and 15% of the total data respectively. A training network titled Multilayer Perception (MLP) as well as algorithm and «back -propagation»techniques were used. The statistical significance of the performance indicators Nash (NSE) and the Root Mean Square Error (RMSE), were assessed using the bootstrap method incorporated in the FITEVAL code. The coefficient of determination (R2) and Normalized Root Mean Square Error (NRMSE) were used as complementary to indicators of traditional assessment. The results of test descriptions and validation indicate good to very good results, so in the forecast phase for selected models MRNA5, MRNA2 and MRNA3, Nash coefficients are 88.0%, 87.9% and 87.1%; mean square root error are 18.87%, 18.96% and 19.56% respectively. We conclude that the average monthly flow forecast of the river Ilave, using Artificial Neural Network models, show a good performance in estimating nonlinear phenomena such as flow behavior.</p><p><strong>KEY WORDS: </strong>* artificial neural networks * back propagation * Ilave river * mean flows</p>


2020 ◽  
Vol 8 (2) ◽  
pp. 8-16
Author(s):  
Zaynab A. Khudhur ◽  
Saad A. Arab ◽  
Ammar S. Dawood

The Major sources of water are surface and subsurface. Surface water includes Rivers, Reservoirs, Creek, Streams, etc. This paper deals with using a neural network model to recognize dissolved oxygen in Shatt Al-Arab. Within the present study, Shatt Al-Arab River (Basrah-Iraq) is considered as the study area with monthly observed data from 2009-2014. Artificial Neural Network (ANN) has been applied to pattern the relations among eight (8) water quality parameters which are devoted for predicting one parameter (1) so that to decrease the load of long experimental procedure. Physical and chemical parameters that are inserted in the model are: pH, total dissolved solids, electrical conductivity, sulphate, phosphate, calcium, magnesium and nitrate. Dissolved oxygen (DO) is included in the output models. The three layered feed-forward model with back-propagation multi-layer perception (MLP) models architecture of 8-8-1 for DO. The artificial neural network has got training successfully and has been tested with 70{1524fc3db9b9185e4da51c194ca3b05c06ae483421403c447a0666442f370a52} and 30{1524fc3db9b9185e4da51c194ca3b05c06ae483421403c447a0666442f370a52} of the data groups. Statistical criteria of correlation coefficient (R2) and mean square error (MSE) are used to evaluate performance of the models. The correlation coefficients of the artificial neural network model for predicting DO have been 0.99354 and 0.98237, and mean square error for the model are 0.007698 and 0.00122 respectively. It can be concluding that these techniques provide similar accuracy in estimating DO concentration and predicting the dissolved oxygen (DO) in Shatt Al-Arab


2020 ◽  
Vol 38 (2A) ◽  
pp. 255-264
Author(s):  
Hanan A. R. Akkar ◽  
Sameem A. Salman

Computer vision and image processing are extremely necessary for medical pictures analysis. During this paper, a method of Bio-inspired Artificial Intelligent (AI) optimization supported by an artificial neural network (ANN) has been widely used to detect pictures of skin carcinoma. A Moth Flame Optimization (MFO) is utilized to educate the artificial neural network (ANN). A different feature is an extract to train the classifier. The comparison has been formed with the projected sample and two Artificial Intelligent optimizations, primarily based on classifier especially with, ANN-ACO (ANN training with Ant Colony Optimization (ACO)) and ANN-PSO (training ANN with Particle Swarm Optimization (PSO)). The results were assessed using a variety of overall performance measurements to measure indicators such as Average Rate of Detection (ARD), Average Mean Square error (AMSTR) obtained from training, Average Mean Square error (AMSTE) obtained for testing the trained network, the Average Effective Processing Time (AEPT) in seconds, and the Average Effective Iteration Number (AEIN). Experimental results clearly show the superiority of the proposed (ANN-MFO) model with different features.


2020 ◽  
Vol 71 (6) ◽  
pp. 66-74
Author(s):  
Younis M. Younis ◽  
Salman H. Abbas ◽  
Farqad T. Najim ◽  
Firas Hashim Kamar ◽  
Gheorghe Nechifor

A comparison between artificial neural network (ANN) and multiple linear regression (MLR) models was employed to predict the heat of combustion, and the gross and net heat values, of a diesel fuel engine, based on the chemical composition of the diesel fuel. One hundred and fifty samples of Iraqi diesel provided data from chromatographic analysis. Eight parameters were applied as inputs in order to predict the gross and net heat combustion of the diesel fuel. A trial-and-error method was used to determine the shape of the individual ANN. The results showed that the prediction accuracy of the ANN model was greater than that of the MLR model in predicting the gross heat value. The best neural network for predicting the gross heating value was a back-propagation network (8-8-1), using the Levenberg�Marquardt algorithm for the second step of network training. R = 0.98502 for the test data. In the same way, the best neural network for predicting the net heating value was a back-propagation network (8-5-1), using the Levenberg�Marquardt algorithm for the second step of network training. R = 0.95112 for the test data.


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