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Applied Computer Science Volume 17, Number 4, 2021

BLACK BOX EFFICIENCY MODELLING OF AN ELECTRIC DRIVE UNIT UTILIZING METHODS OF MACHINE LEARNING

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The increasing electrification of powertrains leads to increased demands for the test technology to ensure the required functions. For conventional test rigs in particular, it is necessary to have knowledge of the test technology's capabilities that can be applied in practical testing. Modelling enables early knowledge of the test rigs dynamic capabilities and the feasibility of planned testing scenarios. This paper describes the modelling of complex subsystems by experimental modelling with artificial neural networks taking transmission efficiency as an example. For data generation, the experimental design and execution is described. The generated data is pre-processed with suitable methods and optimized for the neural networks. Modelling is executed with different variants of the inputs as well as different algorithms. The variants compare and compete with each other. The most suitable variant is validated using statistical methods and other adequate techniques. The result represents reality well and enables the performance investigation of the test systems in a realistic manner.

  • APA 7th style
Bauer, L., Stütz, L., & Kley, M. (2021). Black box efficiency modelling of an electric drive unit utilizing methods of machine learning. Applied Computer Science, 17(4), 5-19. https://doi.org/10.23743/acs-2021-25
  • Chicago style
Bauer, Lukas, Leon Stütz, and Markus Kley. "Black Box Efficiency Modelling of an Electric Drive Unit Utilizing Methods of Machine Learning." Applied Computer Science 17, no. 4 (2021): 5-19.
  • IEEE style
L. Bauer, L. Stütz, and M. Kley, "Black box efficiency modelling of an electric drive unit utilizing methods of machine learning," Applied Computer Science, vol. 17, no. 4, pp. 5-19, 2021, doi: 10.23743/acs-2021-25.
  • Vancouver style
Bauer L, Stütz L, Kley M. Black box efficiency modelling of an electric drive unit utilizing methods of machine learning. Applied Computer Science. 2021;17(4):5-19.

IMPLEMENTATION OF A HARDWARE TROJAN CHIP DETECTOR MODEL USING ARDUINO MICROCONTROLLER

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These days, hardware devices and its associated activities are greatly impacted by threats amidst of various technologies. Hardware trojans are malicious modifications made to the circuitry of an integrated circuit, Exploiting such alterations and accessing the level of damage to devices is considered in this work. These trojans, when present in sensitive hardware system deployment, tends to have potential damage and infection to the system. This research builds a hardware trojan detector using machine learning techniques. The work uses a combination of logic testing and power side-channel analysis (SCA) coupled with machine learning for power traces. The model was trained, validated and tested using the acquired data, for 5 epochs. Preliminary logic tests were conducted on target hardware device as well as power SCA. The designed machine learning model was implemented using Arduino microcontroller and result showed that the hardware trojan detector identifies trojan chips with a reliable accuracy. The power consumption readings of the hardware characteristically start at 1035-1040mW and the power time-series data were simulated using DC power measurements mixed with additive white Gaussian noise (AWGN) with different standard deviations. The model achieves accuracy, precision and accurate recall values. Setting the threshold proba¬bility for the trojan class less than 0.5 however increases the recall, which is the most important metric for overall accuracy acheivement of over 95 percent after several epochs of training.

  • APA 7th style
Abdulsalam, K., Adebisi, J., & Durojaiye, V. (2021). Implementation of a hardware trojan chip detector model using Arduino microcontroller. Applied Computer Science, 17(4), 20-33. https://doi.org/10.23743/acs-2021-26
  • Chicago style
Abdulsalam, Kadeejah, John Adebisi, and Victor Durojaiye. "Implementation of a Hardware Trojan Chip Detector Model Using Arduino Microcontroller." Applied Computer Science 17, no. 4 (2021): 20-33.
  • IEEE style
K. Abdulsalam, J. Adebisi, and V. Durojaiye, "Implementation of a hardware trojan chip detector model using Arduino microcontroller," Applied Computer Science, vol. 17, no. 4, pp. 20-33, 2021, doi: 10.23743/acs-2021-26.
  • Vancouver style
Abdulsalam K, Adebisi J, Durojaiye V. Implementation of a hardware trojan chip detector model using Arduino microcontroller. Applied Computer Science. 2021;17(4):20-33.

ARTIFICIAL NEURAL NETWORK BASED DEMAND FORECASTING INTEGRATED WITH FEDERAL FUNDS RATE

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Adverse effects of inaccurate demand forecasts; stockouts, overstocks, customer loss have led academia and the business world towards accurate demand forecasting methods. Artificial Neural Network (ANN) is capable of highly accurate forecasts integrated with many variables. The use of Price and Promotion variables have increased the accuracy while the addition of other relevant variables would decrease the occurrences of errors. The use of the Federal Funds Rate as an additional macroeconomic variable to ANN forecasting models has been discussed in this research by the means of the accuracy measuring method: Average Relative Mean Absolute Error.

  • APA 7th style
Arachchige, A., Sugathadasa, R., Herath, O., & Thibbotuwawa, A. (2021). Artificial neural network based demand forecasting integrated with Federal Funds Rate. Applied Computer Science, 17(4), 34-44. https://doi.org/10.23743/acs-2021-27
  • Chicago style
Arachchige, Anupa, Ranil Sugathadasa, Oshadhi Herath, and Amila Thibbotuwawa. "Artificial Neural Network Based Demand Forecasting Integrated with Federal Funds Rate." Applied Computer Science 17, no. 4 (2021): 34-44.
  • IEEE style
A. Arachchige, R. Sugathadasa, O. Herath, and A. Thibbotuwawa, "Artificial neural network based demand forecasting integrated with Federal Funds Rate," Applied Computer Science, vol. 17, no. 4, pp. 34-44, 2021, doi: 10.23743/acs-2021-27.
  • Vancouver style
Arachchige A, Sugathadasa R, Herath O, Thibbotuwawa A. Artificial neural network based demand forecasting integrated with Federal Funds Rate. Applied Computer Science. 2021;17(4):34-44.

DETECTION OF FILLERS IN THE SPEECH BY PEOPLE WHO STUTTER

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Stuttering is a speech impediment that is a very complex disorder. It is difficult to diagnose and treat, and is of unknown initiation, despite the large number of studies in this field. Stuttering can take many forms and varies from person to person, and it can change under the influence of external factors. Diagnosing and treating speech disorders such as stuttering requires from a speech therapist, not only good profes-sional preparation, but also experience gained through research and practice in the field. The use of acoustic methods in combination with elements of artificial intelligence makes it possible to objectively assess the disorder, as well as to control the effects of treatment. The main aim of the study was to present an algorithm for automatic recognition of fillers disfluency in the statements of people who stutter. This is done on the basis of their parameterized features in the amplitude-frequency space. The work provides as well, exemplary results demonstrating their possibility and effectiveness. In order to verify and optimize the procedures, the statements of seven stutterers with duration of 2 to 4 minutes were selected. Over 70% efficiency and predictability of automatic detection of these disfluencies was achieved. The use of an automatic method in conjunction with therapy for a stuttering person can give us the opportunity to objectively assess the disorder, as well as to evaluate the progress of therapy.

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  • APA 7th style
Suszyński, W., Charytanowicz, M., Rosa, W., Koczan, L., & Stęgierski, R. (2021). Detection of fillers in the speech by people who stutter. Applied Computer Science, 17(4), 45-54. https://doi.org/10.23743/acs-2021-28
  • Chicago style
Suszyński, Waldemar, Małgorzata Charytanowicz, Wojciech Rosa, Leopold Koczan, and Rafał Stęgierski. "Detection of Fillers in the Speech by People Who Stutter." Applied Computer Science 17, no. 4 (2021): 45-54.
  • IEEE style
W. Suszyński, M. Charytanowicz, W. Rosa, L. Koczan, and R. Stęgierski, "Detection of fillers in the speech by people who stutter," Applied Computer Science, vol. 17, no. 4, pp. 45-54, 2021, doi: 10.23743/acs-2021-28.
  • Vancouver style
Suszyński W, Charytanowicz M, Rosa W, Koczan L, Stęgierski R. Detection of fillers in the speech by people who stutter. Applied Computer Science. 2021;17(4):45-54.

CAREER TRACK PREDICTION USING DEEP LEARNING MODEL BASED ON DISCRETE SERIES OF QUANTITATIVE CLASSIFICATION

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In this paper, a career track recommender system was proposed using Deep Neural Network model. This study aims to assist guidance counselors in guiding their students in the selection of a suitable career track. It is because a lot of Junior High school students experienced track uncertainty and there are instances of shifting to another program after learning they are not suited for the chosen track or course in college. In dealing with the selection of the best student attributes that will help in the creation of the predictive model, the feature engineering technique is used to remove the irrelevant features that can affect the performance of the DNN model. The study covers 1500 students from the first to the third batch of the K-12 curriculum, and their grades from 11 subjects, sex, age, number of siblings, parent’s income, and academic strand were used as attributes to predict their academic strand in Senior High School. The efficiency and accuracy of the algorithm depend upon the correctness and quality of the collected student’s data. The result of the study shows that the DNN algorithm performs reasonably well in predicting the academic strand of students with a prediction accuracy of 83.11%. Also, the work of guidance counselors became more efficient in handling students’ concerns just by using the proposed system. It is concluded that the recommender system serves as a decision tool for counselors in guiding their students to determine which Senior High School track is suitable for students with the utilization of the DNN model.

  • APA 7th style
Hernandez, R., & Atienza, R. (2021). Career track prediction using deep learning model based on discrete series of quantitative classification. Applied Computer Science, 17(4), 55-74. https://doi.org/10.23743/acs-2021-29
  • Chicago style
Hernandez, Rowell, and Robert Atienza. "Career Track Prediction Using Deep Learning Model Based on Discrete Series of Quantitative Classification." Applied Computer Science 17, no. 4 (2021): 55-74.
  • IEEE style
R. Hernandez and R. Atienza, "Career track prediction using deep learning model based on discrete series of quantitative classification," Applied Computer Science, vol. 17, no. 4, pp. 55-74, 2021, doi: 10.23743/acs-2021-29.
  • Vancouver style
Hernandez R, Atienza R. Career track prediction using deep learning model based on discrete series of quantitative classification. Applied Computer Science. 2021;17(4):55-74.

KEYSTROKE DYNAMICS ANALYSIS USING MACHINE LEARNING METHODS

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The primary objective of the paper was to determine the user based on its keystroke dynamics using the methods of machine learning. Such kind of a problem can be formulated as a classification task. To solve this task, four methods of supervised machine learning were employed, namely, logistic regression, support vector machines, random forest, and neural network. Each of three users typed the same word that had 7 symbols 600 times. The row of the dataset consists of 7 values that are the time period during which the particular key was pressed. The ground truth values are the user id. Before the application of machine learning classification methods, the features were transformed to z-score. The classification metrics were obtained for each applied method. The following parameters were determined: precision, recall, f1-score, support, prediction, and area under the receiver operating characteristic curve (AUC). The obtained AUC score was quite high. The lowest AUC score equal to 0.928 was achieved in the case of linear regression classifier. The highest AUC score was in the case of neural network classifier. The method of support vector machines and random forest showed slightly lower results as compared with neural network method. The same pattern is true for precision, recall and F1-score. Nevertheless, the obtained classification metrics are quite high in every case. Therefore, the methods of machine learning can be efficiently used to classify the user based on keystroke patterns. The most recommended method to solve such kind of a problem is neural network.

  • APA 7th style
Shabliy, N., Lupenko, S., Lutsyk, N., Yasniy, O., & Malyshevska, O. (2021). Keystroke dynamics analysis using machine learning methods. Applied Computer Science, 17(4), 75-83. https://doi.org/10.23743/acs-2021-30
  • Chicago style
Shabliy, Nataliya, Serhii Lupenko, Nadiia Lutsyk, Oleh Yasniy, and Olha Malyshevska. "Keystroke Dynamics Analysis Using Machine Learning Methods." Applied Computer Science 17, no. 4 (2021): 75-83.
  • IEEE style
N. Shabliy, S. Lupenko, N. Lutsyk, O. Yasniy, and O. Malyshevska, "Keystroke dynamics analysis using machine learning methods," Applied Computer Science, vol. 17, no. 4, pp. 75-83, 2021, doi: 10.23743/acs-2021-30.
  • Vancouver style
Shabliy N, Lupenko S, Lutsyk N, Yasniy O, Malyshevska O. Keystroke dynamics analysis using machine learning methods. Applied Computer Science. 2021;17(4):75-83.

CYBER-PHYSICAL SYSTEMS TECHNOLOGIES AS A KEY FACTOR IN THE PROCESS OF INDUSTRY 4.0 AND SMART MANUFACTURING DEVELOPMENT

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The continuous development of production processes is currently observed in the fourth industrial revolution, where the key place is the digital transformation of production is known as Industry 4.0. The main technologies in the context of Industry 4.0 consist Cyber-Physical Systems (CPS) and Internet of Things (IoT), which create the capabilities needed for smart factories. Implementation of CPS solutions result in new possibilities creation – mainly in areas such as remote diagnosis, remote services, remote control, condition monitoring, etc. In this paper, authors indicated the importance of Cyber-Physical Systems in the process of the Industry 4.0 and the Smart Manufacturing development. Firstly, the basic information about Cyber-Physical Production Systems were outlined. Then, the alternative definitions and different authors view of the problem were discussed. Secondly, the conceptual model of Cybernetic Physical Production System was presented. Moreover, the case study of proposed solution implementation in the real manufacturing process was presented. The key stage of the verification concerned the obtained data analysis and results discussion.

 

  • APA 7th style
Zubrzycki, J., Świć, A., Sobaszek, Ł., Kovac, J., Kralikova, R., Jencik, R., Smidova, N., Arapi, P., & Homza, J. (2021). Cyber-Physical Systems technologies as a key factor in the process of Industry 4.0 and Smart Manufacturing development. Applied Computer Science, 17(4), 84-99. https://doi.org/10.23743/acs-2021-31
  • Chicago style
Zubrzycki, Jarosław, Antoni Świć, Łukasz Sobaszek, Juraj Kovac, Ruzena Kralikova, Robert Jencik, Natalia Smidova, Polyxeni Arapi, Peter Dulencin, and Jozef Homza. "Cyber-Physical Systems Technologies as a Key Factor in the Process of Industry 4.0 and Smart Manufacturing Development." Applied Computer Science 17, no. 4 (2021): 84-99.
  • IEEE style
J. Zubrzycki et al., "Cyber-Physical Systems technologies as a key factor in the process of Industry 4.0 and Smart Manufacturing development," Applied Computer Science, vol. 17, no. 4, pp. 84-99, 2021, doi: 10.23743/acs-2021-31.
  • Vancouver style
Zubrzycki J, Świć A, Sobaszek Ł, Kovac J, Kralikova R, Jencik R, et al. Cyber-Physical Systems technologies as a key factor in the process of Industry 4.0 and Smart Manufacturing development. Applied Computer Science. 2021;17(4):84-99.

PRODUCTIVITY OF A LOW-BUDGET COMPUTER CLUSTER APPLIED TO OVERCOME THE N-BODY PROBLEM

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The classical n-body problem in physics addresses the prediction of individual motions of a group of celestial bodies under gravitational forces and has been studied since Isaac Newton formulated his laws. Nowadays the n-body problem has been recognized in many more fields of science and engineering. Each problem of mutual interaction between objects forming a dynamic group is called as the n-body problem. The cost of the direct algorithm for the problem is O(n2) and is not acceptable from the practical point of view. For this reason cheaper algorithms have been developed successfully reducing the cost to O(nln(n)) or even O(n). Because further improvement of the algorithms is unlikely to happen it is the hardware solutions which can still accelerate the calculations. The obvious answer here is a computer cluster that can preform the calculations in parallel. This paper focuses on the performance of a low-budget computer cluster created on ad hoc basis applied to n-body problem calculation. In order to maintain engineering valuable results a real technical issue was selected to study. It was Discrete Vortex Method that is used for simulating air flows. The presented research included writing original computer code, building a computer cluster, preforming simulations and comparing the results.

  • APA 7th style
Nowicki, T., Gregosiewicz, A., & Łagodowski, Z. (2021). Productivity of a low-budget computer cluster applied to overcome the n-body problem. Applied Computer Science, 17(4), 100-109. https://doi.org/10.23743/acs-2021-32
  • Chicago style
Nowicki, Tomasz, Adam Gregosiewicz, and Zbigniew Łagodowski. "Productivity of a Low-Budget Computer Cluster Applied to Overcome the N-Body Problem." Applied Computer Science 17, no. 4 (2021): 100-09.
  • IEEE style
T. Nowicki, A. Gregosiewicz, and Z. Łagodowski, "Productivity of a low-budget computer cluster applied to overcome the n-body problem," Applied Computer Science, vol. 17, no. 4, pp. 100-109, 2021, doi: 10.23743/acs-2021-32.
  • Vancouver style
Nowicki T, Gregosiewicz A, Łagodowski Z. Productivity of a low-budget computer cluster applied to overcome the n-body problem. Applied Computer Science. 2021;17(4):100-9.