1. Introduction

Tissue oxygen saturation is a clinical indicator for assessment and diagnosis of many illnesses such as peripheral vascular diseases [1], organ viability [2], hypoxic-ischemia conditions [3], hemorrhagic shock [4], in studies related to cancers [5] and muscle oxidative metabolism [6], and for management of wounds (burns) and ulcers [5, 7]. In this context, sufficient tissue oxygen pressure combined with adequate supply of oxygen and nutrients through functioning microcirculatory system are more likely to guarantee cell survival.

The current state of the arts of skin tissue oxygen consumption measurement includes transcutaneous oxygen tension (TcPO₂). Despite its noninvasive and high accuracy attributes, this equipment required mild heating at the local site in its operation to promote blood perfusion prior to the measurement. Some of the other drawbacks include long measurement time, and sensitivity of its performance to factors such as the person’s stress level, body temperature, medication and local inflammation [8]. Systems that take advantage of physical and optical properties of blood for noninvasive and noncontact measurement of blood oxygen saturation are of increasing demand; the said systems included spectroscopy techniques (optical, time and frequency domains) and clinical imaging methods such as Magnetic Resonance Imaging [9,10], and Photoacoustic techniques [11]. Among the spectroscopy approaches, hyperspectral imaging technique has emerged as a popular choice owing to its inherent ability to produce high resolution data in both spectral and spatial dimensions. Even though this system collects images at a shallow depth of field, it involves less complex technologies. With regard to its application in tissue oxygen measurement using light of visible range, it is able to spectrally resolve information carrying light backscattered from cutaneous tissue. The latter can be used in prediction of haemoglobin concentration and tissue oxygen saturation using either an inverse model, or computer aided, or computational intelligence system [12, 13]. Since the system interrogates blood in dermal capillaries, arterioles and venules [14], the predicted value is often taken as the average of oxygen saturation within the cutaneous microenvironment, S_tO₂. Previous works [15, 16] from this laboratory found that the range of predictions is dependent on the system configuration and architecture, and the wavelengths used. Meanwhile the use of Artificial Intelligence (AI) techniques has received a great deal of attention in this arena of study over the past years due to its ability to learn by itself through a large set of data, events and statistics before making decision. This capacity makes it a highly sought-after means for classification, prediction and forecasting tasks in many fields (for a review, see [17, 18]). In addition, much less efforts and time is needed to spend on improving the formulations of inverse models and look-up table.

The use of AI in medicine is well recognized to provide better quality medical health care services by reinforcing diagnosis with prediction and identifying definitive intervention, thus reducing morbidity and mortality case, and healthcare cost. Among the applications of AI include diagnosis and prognosis of cancers, illness and disease, to aid in decision makings and for physiotherapy practice [19, 20]. The examples of AI used for clinical screening and imaging tasks are such as optimization algorithms (see ref. [21] for a comprehensive review), neural network [22], and computer aided diagnosis [23].

To the best of the authors’ knowledge the use of AI, and the study of the performance of different AI techniques, in the predictions of S_tO₂ using an optical system is few and far between. The further advancement in the integration of these technologies is impeded by insufficiency of data available for the training of the AI system, prompting the work by [24] that used Monte Carlo (MC) platform for training of artificial neural networks for future optical diagnostics and sensing. This work is following in the footsteps of [24], and our aim is to compare the performance of different AI techniques for the prediction of S_tO₂ using MC simulation data.

2. Material and Methods

2.1.  Monte Carlo (MC) simulations of light propagation

The two layered human skin model, the illumination and detection systems used for simulations of light propagated in skin shown in Figure 1 were previously presented in [22]. These simulation data are used here again owing to the known medium S_tO₂ for evaluations of performance of prediction techniques described in the following. The simulation data for medium percent S_tO₂ ranging from 0 % to 100 % at a step resolution of   5 % were added with Gaussian White Noise (AWGN function in MATLAB 2018a) to produce signals with signal-to-noise ratio (SNR) of 20 and 30 dB. For each SNR and S_tO₂ level, 10 sets of random noise were incorporated into the simulations to give a total of 210 data for each SNR level, among which 70 % (n = 147) were randomly chosen for the training of the model, while the remaining (n = 63) were used as the testing data.

Figure 1: MC simulations of light propagation in a two-layered skin medium

2.2.  Features selection

Since light absorption in skin varied with oxygen binding status of hemoglobins (i.e. oxyhemoglobin and deoxyhemoglobin concentration), by examining the absorption differences in the spectra of these hemoglobin components one can deduce the required S_tO₂ parameter. The simulated spectral data in section 2.1 were used as the input data to the artificial intelligence techniques. This work considered signals across the wavelengths ranged from 520 nm to 650 nm where changes in hemoglobin absorptivity signatures with S_tO₂ are significant (image can be found in [25]).

2.3.  Tissue oxygen saturation prediction tools

In the present study, we investigated three different machine learning techniques: artificial neural network (ANN), partial least square (PLS) and K-nearest neighbor (KNN) in the estimation of the required percent S_tO₂ value. The error, ε, (in unit of %) in the predicted value, S_tO_2(p), is defined as:

where S_tO₂‘ is the ground truth value. The prediction tools presented in the following used MATLAB (version 2018b) software in their implementation due to its comprehensive multivariate analysis toolboxes.

• Artificial Neural Network (ANN)

This work used nnstart toolbox to generate an ANN feedforward model from the simulation data. We have chosen 10 hidden neuron layers, and the fitting of the input-output relationship was by using Levenberg-Marquardt (LM) backpropagation model to update weights in minimizing sum of square error functions. This ANN model was modified from the prior work in [22], wherein ‘while’ loop structure was adopted in obtaining a neural network with acceptable performance during its training. This is with the implementation of arbitrarily chosen MSE threshold value of 24 and 15, respectively, for dataset of SNR = 20 and 30 dB.

• Partial Least Square Regression (PLS)

PLS regression analysis was used here to develop a prediction model. This technique predicts the response, Y, for a set of data by extracting latent variables from sampled observed variables, X, as followed:

where T and U are latent variables, P’ and Q’ are loading matrices and E₀ and F₀ are residuals. The latent variables are related via inner relation coefficient, B, and residual, F₁, as followed:

This study used plsregress function to project high dimensionalities feature vectors (X and Y) onto a subspace to give an overall partial regression model given by:

The  vector in (4) that simplified the regression problem was used to predict the most probable percent S_tO₂ value. We have chosen latent factor of 3 for demonstration purpose. It must also be mentioned that the present work found no improvement in the prediction accuracy using other factor number.

• K-Nearest Neighbor (KNN)

The KNN classification model for predictors, X, and response, Y, was generated using fitcknn. This study considered exhaustive search algorithm to find the nearest neighbors by calculating the distances from all points in X to each point in Y. The distance metric that was considered in the present study is Minkowski distance. The K value was chosen as 11 based on the size of the datasets following the discussion in [26]. The trained classifier in (5) was then used to predict the class of the testing data.

3. Results and analysis

Figure 2: Noise corrupted wavelength dependent light attenuation with Signal to Noise (SNR) of 20 dB (dark lines) and 30 dB (red lines) under different S_tO₂ condition.

The changes in light attenuation spectrum following variations in the reference S_tO₂ (i.e. ground truth values used in the simulations) are shown in Figure 2. The plots showed example changes in the noise corrupted signals of the considered SNR. These spectral data across wavelength range of 520 – 650 nm and a resolution of 1 nm were used for both training and evaluation of the considered models using a constant random seed for comparable results. The data were separated into training and testing sets with a percentage of 70:30. Figure 3 showed the three-dimensional plots of attenuations from training set for the reference of our readers. These plots also revealed changes in the value range and distribution with noise level. The mean (SD) of the absolute ε calculated from (1) for percent value predicted by ANN, PLS and KNN technique for spectrum of different reference S_tO₂ shown in Table 1 is calculated as 8.76 (6.82) %, 4.67 (3.88) % and 7.62 (6.08) %, and 4.77 (3.96) %, 2 (1.37) % and 4.28(3.57) % for dataset of SNR of 20 dB and 30 dB, respectively. The computation time (averaged from three consecutive runs) spent in the training of the machine learning techniques described in section 2.3.1-2.3.3 performed on an ASUS laptop with 64-bit window 7, Intel® Core™ Duo T6500 CPU @2.10 GHz are given by 1.38 and 1.8 seconds for PLS and KNN, respectively. A longer average time was needed for ANN with the time taken recorded as 81.5 and 39.1 seconds in the training of data of SNR = 20 and 30 dB, respectively.

4. Discussion

Figure 2 showed substantial decrease in the noise level on the spectra for signals of SNR 30 dB as compared to that of 20 dB. This decrease in noise level yields an overall improvement in the prediction accuracy in Table 1 with an average decrease in ε value calculated as 3.33(0.66) %. The lowest mean prediction error was observed for values given by PLS technique; this is followed by KNN and ANN. While both ANN and PLS produced regressed value in their predictions, categorical values according to the range of target values used during the training process were produced by the KNN. The main reason PLS technique outperformed its counterparts in the validation phase is likely due to the accentuation of the variations in the absorptivity through the projection of data to a lower dimensional space. An investigation into the correlation coefficients obtained from the regression of centre variables X and Y in (2) using three latent factors revealed a strong positive correlation at wavelength 580 nm, followed by that of 538 nm under SNR = 30 dB. These peaks increasingly diminished under SNR 20 dB.

Since similar distribution of attenuation values with changes in S_tO₂ was observed in Figure 2, and the features used in the training of the considered AI models discussed in section 2.2 are of full spectral information (attenuations across wavelength range 520 –

Table 1: Error, ε, in the value predicted for testing dataset of SNR 20 dB (Left) and 30 dB (Right) sing (from top to bottom) Artificial neural network (ANN), Partial Least Square (PLS) and K-Nearest Neighbor (KNN).u

Figure 3. Three-dimensional surface plots of light attenuation values for SNR of (left) 20 and (right) 30 dB.

650 nm at a step resolution of 1 nm), this produces a poor network and association on the relationship between input and target values. The prediction errors can be minimized by considering features that are of utmost significance, such as those within the presence of troughs and crest across wavelengths 540 to 570 nm. An example of previous works from this laboratory in [22] extracted and considered the important features (i.e. magnitude and wavelength of the hemoglobin peaks) in the prediction work, hence minimizing errors from overfitting.

Meanwhile the KNN technique is primarily based on the location (i.e. magnitude) of these attenuation values, large difference in the values with changes in S_tO₂ would be desirable to yield better accuracy result. For this reason, relatively consistent errors were observed in Table 1. We hypothesized that this technique could be successfully applied to the classification of skin pigmentations.

It must be mentioned that the use of two-layered homogeneous medium is insufficient to represent human skin tissues since there are differences in optical properties of heterogeneous sub-layers in skin as widely reported in earlier works [27, 28]. Nonetheless the findings from this study would be useful when measurement data are readily available.

5. Conclusion

This work investigated the performance of different AI techniques in the prediction of medium S_tO₂ using MC technique. The significant findings of this study include the validation of the importance of hemoglobin signatures in the prediction of the required S_tO₂ value. The notably better accuracy in the values predicted using PLS regression technique is owing to its ability to distinguish the hemoglobin peaks using latent factor of 3. Meanwhile the shortcoming of KNN technique in the prediction work is largely contributed by the high similarity in the range and distribution of light attenuation values making the classification process complex and difficult. In addition, the large spectral information used in ANN technique resulted in over-fitting problem and produced comparatively larger errors. This work concluded that PLS regression performed well in the prediction of S_tO₂, and this technique may also be suitably used to select the distinctive signatures of spectral prior to the development of a prediction model using other AI technique.

Conflict of Interest

The authors declare no conflict of interest.

Acknowledgment

The authors would like to acknowledge Research Management Center (RMC) Universiti Tun Hussein Onn Malaysia for funding this study under research fund Vot E15501.

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31. Bakhtyar Ahmed Mohammed, Muzhir Shaban Al-Ani, "Follow-up and Diagnose COVID-19 Using Deep Learning Technique", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 2, pp. 971–976, 2021. doi: 10.25046/aj0602111
32. Showkat Ahmad Dar, S Palanivel, "Performance Evaluation of Convolutional Neural Networks (CNNs) And VGG on Real Time Face Recognition System", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 2, pp. 956–964, 2021. doi: 10.25046/aj0602109
33. Kenza Aitelkadi, Hicham Outmghoust, Salahddine laarab, Kaltoum Moumayiz, Imane Sebari, "Detection and Counting of Fruit Trees from RGB UAV Images by Convolutional Neural Networks Approach", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 2, pp. 887–893, 2021. doi: 10.25046/aj0602101
34. Binghan Li, Yindong Hua, Mi Lu, "Advanced Multiple Linear Regression Based Dark Channel Prior Applied on Dehazing Image and Generating Synthetic Haze", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 2, pp. 790–800, 2021. doi: 10.25046/aj060291
35. Abraham Adiputra Wijaya, Inten Yasmina, Amalia Zahra, "Indonesian Music Emotion Recognition Based on Audio with Deep Learning Approach", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 2, pp. 716–721, 2021. doi: 10.25046/aj060283
36. Shahnaj Parvin, Liton Jude Rozario, Md. Ezharul Islam, "Vehicle Number Plate Detection and Recognition Techniques: A Review", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 2, pp. 423–438, 2021. doi: 10.25046/aj060249
37. Md. Ashfaqul Islam, Maisha Hasnin, Nayeem Iftakhar, Md. Mushfiqur Rahman, "Super Resolution Based Underwater Image Enhancement by Illumination Adjustment and Color Correction with Fusion Technique", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 2, pp. 36–42, 2021. doi: 10.25046/aj060205
38. Byeongwoo Kim, Jongkyu Lee, "Fault Diagnosis and Noise Robustness Comparison of Rotating Machinery using CWT and CNN", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 1, pp. 1279–1285, 2021. doi: 10.25046/aj0601146
39. Basavaraj Madagouda, R. Sumathi, "Artificial Neural Network Approach using Mobile Agent for Localization in Wireless Sensor Networks", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 1, pp. 1137–1144, 2021. doi: 10.25046/aj0601127
40. Alisson Steffens Henrique, Anita Maria da Rocha Fernandes, Rodrigo Lyra, Valderi Reis Quietinho Leithardt, Sérgio D. Correia, Paul Crocker, Rudimar Luis Scaranto Dazzi, "Classifying Garments from Fashion-MNIST Dataset Through CNNs", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 1, pp. 989–994, 2021. doi: 10.25046/aj0601109
41. Reem Bayari, Ameur Bensefia, "Text Mining Techniques for Cyberbullying Detection: State of the Art", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 1, pp. 783–790, 2021. doi: 10.25046/aj060187
42. Imane Jebli, Fatima-Zahra Belouadha, Mohammed Issam Kabbaj, Amine Tilioua, "Deep Learning based Models for Solar Energy Prediction", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 1, pp. 349–355, 2021. doi: 10.25046/aj060140
43. Dionisius Saviordo Thenuardi, Benfano Soewito, "Indoor Positioning System using WKNN and LSTM Combined via Ensemble Learning", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 1, pp. 242–249, 2021. doi: 10.25046/aj060127
44. Karamath Ateeq, Manas Ranjan Pradhan, Beenu Mago, "Elasticity Based Med-Cloud Recommendation System for Diabetic Prediction in Cloud Computing Environment", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 1618–1633, 2020. doi: 10.25046/aj0506193
45. Revanna Sidamma Kavitha, Uppara Eranna, Mahendra Nanjappa Giriprasad, "A Computational Modelling and Algorithmic Design Approach of Digital Watermarking in Deep Neural Networks", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 1560–1568, 2020. doi: 10.25046/aj0506187
46. Majdouline Meddad, Chouaib Moujahdi, Mounia Mikram, Mohammed Rziza, "Optimization of Multi-user Face Identification Systems in Big Data Environments", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 762–767, 2020. doi: 10.25046/aj050691
47. Yohei Yamauchi, Mitsuyuki Saito, "Adaptive Identification Method of Vehicle Model for Autonomous Driving Robust to Environmental Disturbances", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 710–717, 2020. doi: 10.25046/aj050685
48. Marcel Nicola, Marian Duță, Maria-Cristina Nițu, Ancuța-Mihaela Aciu, Claudiu-Ionel Nicola, "Improved System Based on ANFIS for Determining the Degree of Polymerization", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 664–675, 2020. doi: 10.25046/aj050680
49. Khalid Chennoufi, Mohammed Ferfra, "Fast and Efficient Maximum Power Point Tracking Controller for Photovoltaic Modules", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 606–612, 2020. doi: 10.25046/aj050674
50. Kin Yun Lum, Yeh Huann Goh, Yi Bin Lee, "American Sign Language Recognition Based on MobileNetV2", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 481–488, 2020. doi: 10.25046/aj050657
51. Miroslav Kratky, Vaclav Minarik, Michal Sustr, Jan Ivan, "Electronic Warfare Methods Combatting UAVs", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 447–454, 2020. doi: 10.25046/aj050653
52. Gede Putra Kusuma, Jonathan, Andreas Pangestu Lim, "Emotion Recognition on FER-2013 Face Images Using Fine-Tuned VGG-16", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 315–322, 2020. doi: 10.25046/aj050638
53. Lubna Abdelkareim Gabralla, "Dense Deep Neural Network Architecture for Keystroke Dynamics Authentication in Mobile Phone", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 307–314, 2020. doi: 10.25046/aj050637
54. Kailerk Treetipsounthorn, Thanisorn Sriudomporn, Gridsada Phanomchoeng, Christian Dengler, Setha Panngum, Sunhapos Chantranuwathana, Ali Zemouche, "Vehicle Rollover Detection in Tripped and Untripped Rollovers using Recurrent Neural Networks", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 228–238, 2020. doi: 10.25046/aj050627
55. Andrea Generosi, Silvia Ceccacci, Samuele Faggiano, Luca Giraldi, Maura Mengoni, "A Toolkit for the Automatic Analysis of Human Behavior in HCI Applications in the Wild", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 185–192, 2020. doi: 10.25046/aj050622
56. Fei Gao, Jiangjiang Liu, "Effective Segmented Face Recognition (SFR) for IoT", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 36–44, 2020. doi: 10.25046/aj050605
57. Sherif H. ElGohary, Aya Lithy, Shefaa Khamis, Aya Ali, Aya Alaa el-din, Hager Abd El-Azim, "Interactive Virtual Rehabilitation for Aphasic Arabic-Speaking Patients", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 5, pp. 1225–1232, 2020. doi: 10.25046/aj0505148
58. Daniyar Nurseitov, Kairat Bostanbekov, Maksat Kanatov, Anel Alimova, Abdelrahman Abdallah, Galymzhan Abdimanap, "Classification of Handwritten Names of Cities and Handwritten Text Recognition using Various Deep Learning Models", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 5, pp. 934–943, 2020. doi: 10.25046/aj0505114
59. Zahra Jafari, Saman Rajebi, Siyamak Haghipour, "Using the Neural Network to Diagnose the Severity of Heart Disease in Patients Using General Specifications and ECG Signals Received from the Patients", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 5, pp. 882–892, 2020. doi: 10.25046/aj0505108
60. Gökalp Çınarer, Bülent Gürsel Emiroğlu, Recep Sinan Arslan, Ahmet Haşim Yurttakal, "Brain Tumor Classification Using Deep Neural Network", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 5, pp. 765–769, 2020. doi: 10.25046/aj050593
61. Lana Abdulrazaq Abdullah, Muzhir Shaban Al-Ani, "CNN-LSTM Based Model for ECG Arrhythmias and Myocardial Infarction Classification", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 5, pp. 601–606, 2020. doi: 10.25046/aj050573
62. Chigozie Enyinna Nwankpa, "Advances in Optimisation Algorithms and Techniques for Deep Learning", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 5, pp. 563–577, 2020. doi: 10.25046/aj050570
63. Hicham Moujahid, Bouchaib Cherradi, Oussama El Gannour, Lhoussain Bahatti, Oumaima Terrada, Soufiane Hamida, "Convolutional Neural Network Based Classification of Patients with Pneumonia using X-ray Lung Images", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 5, pp. 167–175, 2020. doi: 10.25046/aj050522
64. Mohsine Elkhayati, Youssfi Elkettani, "Towards Directing Convolutional Neural Networks Using Computational Geometry Algorithms: Application to Handwritten Arabic Character Recognition", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 5, pp. 137–147, 2020. doi: 10.25046/aj050519
65. Nghia Duong-Trung, Luyl-Da Quach, Chi-Ngon Nguyen, "Towards Classification of Shrimp Diseases Using Transferred Convolutional Neural Networks", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 4, pp. 724–732, 2020. doi: 10.25046/aj050486
66. Adonis Santos, Patricia Angela Abu, Carlos Oppus, Rosula Reyes, "Real-Time Traffic Sign Detection and Recognition System for Assistive Driving", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 4, pp. 600–611, 2020. doi: 10.25046/aj050471
67. Amar Choudhary, Deependra Pandey, Saurabh Bhardwaj, "Overview of Solar Radiation Estimation Techniques with Development of Solar Radiation Model Using Artificial Neural Network", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 4, pp. 589–593, 2020. doi: 10.25046/aj050469
68. Mohammed Qbadou, Intissar Salhi, Hanaâ El fazazi, Khalifa Mansouri, Michail Manios, Vassilis Kaburlasos, "Human-Robot Multilingual Verbal Communication – The Ontological knowledge and Learning-based Models", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 4, pp. 540–547, 2020. doi: 10.25046/aj050464
69. Marco Bindi, Igor Aizenberg, Riccardo Belardi, Francesco Grasso, Antonio Luchetta, Stefano Manetti, Maria Cristina Piccirilli, "Neural Network-Based Fault Diagnosis of Joints in High Voltage Electrical Lines", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 4, pp. 488–498, 2020. doi: 10.25046/aj050458
70. Deborah Ooi Yee Hui, Syaheerah Lebai Lutfi, Syibrah Naim, Zahid Akhtar, Ahmad Sufril Azlan Mohamed, Kamran Siddique, "The Sound of Trust: Towards Modelling Computational Trust using Voice-only Cues at Zero-Acquaintance", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 4, pp. 469–476, 2020. doi: 10.25046/aj050456
71. Roberta Avanzato, Francesco Beritelli, "A CNN-based Differential Image Processing Approach for Rainfall Classification", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 4, pp. 438–444, 2020. doi: 10.25046/aj050452
72. Van-Hung Le, Hung-Cuong Nguyen, "A Survey on 3D Hand Skeleton and Pose Estimation by Convolutional Neural Network", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 4, pp. 144–159, 2020. doi: 10.25046/aj050418
73. Jesuretnam Josemila Baby, James Rose Jeba, "A Hybrid Approach for Intrusion Detection using Integrated K-Means based ANN with PSO Optimization", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 3, pp. 317–323, 2020. doi: 10.25046/aj050341
74. Neptali Montañez, Jomari Joseph Barrera, "Automated Abaca Fiber Grade Classification Using Convolution Neural Network (CNN)", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 3, pp. 207–213, 2020. doi: 10.25046/aj050327
75. Yeji Shin, Youngone Cho, Hyun Wook Kang, Jin-Gu Kang, Jin-Woo Jung, "Neural Network-based Efficient Measurement Method on Upside Down Orientation of a Digital Document", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 2, pp. 697–702, 2020. doi: 10.25046/aj050286
76. Jan Sikora, David Fojtík, "Classification of Timber Load on Trucks", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 2, pp. 683–687, 2020. doi: 10.25046/aj050284
77. Ahmed EL Orche, Mohamed Bahaj, "Approach to Combine an Ontology-Based on Payment System with Neural Network for Transaction Fraud Detection", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 2, pp. 551–560, 2020. doi: 10.25046/aj050269
78. Ola Surakhi, Sami Serhan, Imad Salah, "On the Ensemble of Recurrent Neural Network for Air Pollution Forecasting: Issues and Challenges", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 2, pp. 512–526, 2020. doi: 10.25046/aj050265
79. Bokyoon Na, Geoffrey C Fox, "Object Classifications by Image Super-Resolution Preprocessing for Convolutional Neural Networks", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 2, pp. 476–483, 2020. doi: 10.25046/aj050261
80. Jude B. Rola, Cherry Lyn C. Sta. Romana, Larmie S. Feliscuzo, Ivy Fe M. Lopez, Cherry N. Rola, "A Comparative Analysis of ARIMA and Feed-Forward Neural Network Prognostic Model for Bull Services", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 2, pp. 411–418, 2020. doi: 10.25046/aj050253
81. Halima Begum, Muhammed Mazharul Islam, "A Study on the Effects of Combining Different Features for the Recognition of Handwritten Bangla Characters", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 2, pp. 197–203, 2020. doi: 10.25046/aj050225
82. Lenin G. Falconi, Maria Perez, Wilbert G. Aguilar, Aura Conci, "Transfer Learning and Fine Tuning in Breast Mammogram Abnormalities Classification on CBIS-DDSM Database", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 2, pp. 154–165, 2020. doi: 10.25046/aj050220
83. Daihui Li, Chengxu Ma, Shangyou Zeng, "Design of Efficient Convolutional Neural Module Based on An Improved Module", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 1, pp. 340–345, 2020. doi: 10.25046/aj050143
84. Farah Nadia Ibrahim, Zalhan Mohd Zin, Norazlin Ibrahim, "Eye Feature Extraction with Calibration Model using Viola-Jones and Neural Network Algorithms", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 6, pp. 208–215, 2019. doi: 10.25046/aj040627
85. Ivan P. Yamshchikov, Alexey Tikhonov, "Learning Literary Style End-to-end with Artificial Neural Networks", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 6, pp. 115–125, 2019. doi: 10.25046/aj040614
86. Michael Santacroce, Daniel Koranek, Rashmi Jha, "Detecting Malicious Assembly using Convolutional, Recurrent Neural Networks", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 5, pp. 46–52, 2019. doi: 10.25046/aj040506
87. M. Monica Subashini, Abhinav Deshpande, Ramani Kannan, "Study and Implementation of Various Image De-Noising Methods for Traffic Sign Board Recognition", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 4, pp. 545–560, 2019. doi: 10.25046/aj040466
88. Mohamad Faiz Ahmad, Syed Sahal Nazli Alhady, Ooi Zhu Oon, Wan Amir Fuad Wajdi Othman, Aeizaal Azman Abdul Wahab, Ahmad Afiq Muhammad Zahir, "Embedded Artificial Neural Network FPGA Controlled Cart", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 4, pp. 509–516, 2019. doi: 10.25046/aj040461
89. Alimam Mohammed Karim, Alimam Mohammed Abdellah, Seghuiouer Hamid, "Long-term Traffic Flow Forecasting Based on an Artificial Neural Network", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 4, pp. 323–327, 2019. doi: 10.25046/aj040441
90. Priyamvada Chandel, Tripta Thakur, "Smart Meter Data Analysis for Electricity Theft Detection using Neural Networks", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 4, pp. 161–168, 2019. doi: 10.25046/aj040420
91. Ajees Arimbassery Pareed, Sumam Mary Idicula, "A Relation Extraction System for Indian Languages", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 2, pp. 65–69, 2019. doi: 10.25046/aj040208
92. Eralda Gjika, Aurora Ferrja, Arbesa Kamberi, "A Study on the Efficiency of Hybrid Models in Forecasting Precipitations and Water Inflow Albania Case Study", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 1, pp. 302–310, 2019. doi: 10.25046/aj040129
93. Samuel Oludare Bamgbose, Xiangfang Li, Lijun Qian, "Trajectory Tracking Control Optimization with Neural Network for Autonomous Vehicles", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 1, pp. 217–224, 2019. doi: 10.25046/aj040121
94. Bok Gyu Han, Hyeon Seok Yang, Ho Gyeong Lee, Young Shik Moon, "Low Contrast Image Enhancement Using Convolutional Neural Network with Simple Reflection Model", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 1, pp. 159–164, 2019. doi: 10.25046/aj040115
95. Ali I. Hammoodi, Mariofanna Milanova, Haider Raad, "Elliptical Printed Dipole Antenna Design using ANN Based on Levenberg–Marquardt Algorithm", Advances in Science, Technology and Engineering Systems Journal, vol. 3, no. 5, pp. 394–397, 2018. doi: 10.25046/aj030545
96. Margaret Lech, Melissa Stolar, Robert Bolia, Michael Skinner, "Amplitude-Frequency Analysis of Emotional Speech Using Transfer Learning and Classification of Spectrogram Images", Advances in Science, Technology and Engineering Systems Journal, vol. 3, no. 4, pp. 363–371, 2018. doi: 10.25046/aj030437
97. Alaa Hamza Omran, Yaser Muhammad Abid, "Design of smart chess board that can predict the next position based on FPGA", Advances in Science, Technology and Engineering Systems Journal, vol. 3, no. 4, pp. 193–200, 2018. doi: 10.25046/aj030417
98. Rasel Ahmmed, Md. Asadur Rahman, Md. Foisal Hossain, "An Advanced Algorithm Combining SVM and ANN Classifiers to Categorize Tumor with Position from Brain MRI Images", Advances in Science, Technology and Engineering Systems Journal, vol. 3, no. 2, pp. 40–48, 2018. doi: 10.25046/aj030205
99. An-Ting Cheng, Chun-Yen Chen, Bo-Cheng Lai, Che-Huai Lin, "Software and Hardware Enhancement of Convolutional Neural Networks on GPGPUs", Advances in Science, Technology and Engineering Systems Journal, vol. 3, no. 2, pp. 28–39, 2018. doi: 10.25046/aj030204
100. Sougata Sheet, Anupam Ghosh, Sudhindu Bikash Mandal, "Cancer Mediating Genes Recognition using Multilayer Perceptron Model- An Application on Human Leukemia", Advances in Science, Technology and Engineering Systems Journal, vol. 3, no. 2, pp. 8–20, 2018. doi: 10.25046/aj030202