Ivan Dychka

Work place: Computer Systems Software Department, Igor Sikorsky Kyiv Polytechnic Institute, Kyiv, Ukraine

E-mail: dychka@pzks.fpm.kpi.ua


Research Interests: Computer systems and computational processes


Ivan Dychka: D.S., Professor, Dean of Faculty of Applied Mathematics, National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Ukraine.
Research Interests: Computer Systems and Networks Software, Automated Control Systems, Intelligence and Expert Systems, Databases and Knowledge Bases, Information Security Software for Computer Systems and Networks.

Author Articles
Augmenting Sentiment Analysis Prediction in Binary Text Classification through Advanced Natural Language Processing Models and Classifiers

By Zhengbing Hu Ivan Dychka Kateryna Potapova Vasyl Meliukh

DOI: https://doi.org/10.5815/ijitcs.2024.02.02, Pub. Date: 8 Apr. 2024

Sentiment analysis is a critical component in natural language processing applications, particularly for text classification. By employing state-of-the-art techniques such as ensemble methods, transfer learning and deep learning architectures, our methodology significantly enhances the robustness and precision of sentiment predictions. We systematically investigate the impact of various NLP models, including recurrent neural networks and transformer-based architectures, on sentiment classification tasks. Furthermore, we introduce a novel ensemble method that combines the strengths of multiple classifiers to improve the predictive ability of the system. The results demonstrate the potential of integrating state-of-the-art Natural Language Processing (NLP) models with ensemble classifiers to advance sentiment analysis. This lays the foundation for a more advanced comprehension of textual sentiments in diverse applications.

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Method of Performing Operations on the Elements of GF(2m) Using a Sparse Table

By Ivan Dychka Mykola Onai Andrii Severin Cennuo Hu

DOI: https://doi.org/10.5815/ijcnis.2024.01.05, Pub. Date: 8 Feb. 2024

For the implementation of error-correcting codes, cryptographic algorithms, and the construction of homomorphic methods for privacy-preserving, there is a need for methods of performing operations on elements GF(2m) that have low computational complexity. This paper analyzes the existing methods of performing operations on the elements GF(2m) and proposes a new method based on the use of a sparse table of elements of this field. The object of research is the processes of operations in information security systems. The subject of research is methods and algorithms for performing operations on elements GF(2m). The purpose of this research is to develop and improve methods and algorithms for performing operations on elements GF(2m) to reduce their computational complexity. Empirical methods and methods of mathematical and software modeling are used in the research. Existing and proposed algorithms are implemented using the C# programming language in the Visual Studio 2015 development environment. Experimental research of existing and developed algorithms was carried out according to the proposed method, which allows to level the influence of additional parameters on the results of the research. The conducted research on methods for performing operations on the elements GF(2m) shows the expediency of using a sparse table of field elements. This approach makes it possible to reduce the amount of RAM required for the software and hardware implementation of the developed method compared to the classical tabular method, which requires storage of a full table of correspondence of the polynomial and index representation of the field elements. In addition, the proposed method gives an increase in speed of more than 4 times for the operations of calculating the multiplicative inverse element and exponentiation. As a result, the proposed method allows to reduce the computational complexity of error-correcting codes, cryptographic algorithms, and the homomorphic methods for privacy-preserving.

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Non-Linear Model of the Damping Process in a System with a two-mass Pendulum Absorber

By Zhengbing Hu Viktor Legeza Ivan Dychka Mykola Onai

DOI: https://doi.org/10.5815/ijisa.2019.01.07, Pub. Date: 8 Jan. 2019

In this paper, the dynamic behavior of the damping system is analyzed with a two-mass pendulum absorber, the equations of motion of non-linear mechanical systems are built accordingly. AFC equation systems have been identified in the non-linear formulation. To obtain the frequency response, the Ritz averaging method is used. A new numerical method of determining the parameters of optimal tuning two-mass pendulum absorber in the non-linear formulation has been Proposed and implemented.

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Improved Method of López-Dahab-Montgomery Scalar Point Multiplication in Binary Elliptic Curve Cryptography

By Zhengbing Hu Ivan Dychka Mykola Onai Mykhailo Ivashchenko Su Jun

DOI: https://doi.org/10.5815/ijisa.2018.12.03, Pub. Date: 8 Dec. 2018

As elliptic curve cryptography is one of the popular ways of constructing an encoding and decoding processes, public-key algorithms as its basis provide people a comfortable way of exchanging pieces of encoded information. As the time goes by, a lot of algorithms have emerged, some of them are still in use today; some others are still being developed into new forms. The main point of algorithm innovation is to reduce the number of processed operations during every possible step to find maximum efficiency and highest speed while performing the calculations. This article describes an improved method of the López-Dahab-Montgomery (LD-Montgomery) scalar point multiplication in terms of working with binary elliptic curves. It is shown in the article that the possible improvement lies in reordering the set of operations which is used in LD-Montgomery scalar point multiplication algorithm. The algorithm is used to compute point multiplication results of the curves over binary Galois Fields featuring the following m values: . The article also presents the experimental results based on different scalars.

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Mathematical Model of the Dynamics in a One Nonholonomic Vibration Protection System

By Viktor Legeza Ivan Dychka Ruslan Hadyniak Liubov Oleshchenko

DOI: https://doi.org/10.5815/ijisa.2018.10.03, Pub. Date: 8 Oct. 2018

Dynamic behavior of a heavy homogeneous sphere in a spherical cavity of a supporting body that performs specified translational movements in space has been studied. Using the Appel formalism, the equations of ball motion in a moving spherical cavity without slip are constructed and a numerical analysis of the evolution of the ball motion is carried out.

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Method of Medical Images Similarity Estimation Based on Feature Analysis

By Zhengbing Hu Ivan Dychka Yevgeniya Sulema Yuliia Valchuk Oksana Shkurat

DOI: https://doi.org/10.5815/ijisa.2018.05.02, Pub. Date: 8 May 2018

The paper presents the method of medical images similarity estimation based on feature extraction and analysis. The proposed method has been developed for and tested on rat brain histological images, however, it can be applied for other types of medical images, since the general approach is based on consideration of the shape of core components present in a given template image. The proposed method can be used in image analysis tools in a wide range of image-based medical investigations, in particular, in the brain researches.
The theoretical background of the proposed method is presented in the paper. The expert evaluation approach used for assessment of the proposed method effectiveness is explained and illustrated by examples. The method of medical images similarity estimation based on feature analysis consists of several stages: colour model conversion, image normalization, anti-noise filtering, contours search, conversion, and feature analysis. The results of the proposed method algorithmic realization are demonstrated and discussed.

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Mathematical Model of the Damping Process in a One System with a Ball Vibration Absorber

By Zhengbing Hu Viktor Legeza Ivan Dychka Dmytro Legeza

DOI: https://doi.org/10.5815/ijisa.2018.01.04, Pub. Date: 8 Jan. 2018

The forced oscillations of the damping mechanical system of solids "Ball Vibration Absorber (BVA) with linearly viscous resistance – a movable carrier body" under the influence of external harmonic excitation are considered. Based on Appell's formalism, the dynamic equations for the joint motion of a heavy ball without sliding into a spherical cavity of a carrier body are formulated and numerically studied. The amplitude-frequency characteristic of the damping mechanical system and the curves of the dependences of the maximum amplitude of the oscillations of the carrier body on the values of the radius of the spherical cavity and the coefficient of viscous resistance of the BVA are obtained. The conditions and restrictions on the rolling of a heavy ball in the spherical recess of the absorber without sliding are determined.

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Graphical Data Steganographic Protection Method Based on Bits Correspondence Scheme

By Zhengbing Hu Ivan Dychka Yevgeniya Sulema Yevhen Radchenko

DOI: https://doi.org/10.5815/ijisa.2017.08.04, Pub. Date: 8 Aug. 2017

The proposed method of graphical data protection is a combined crypto-steganographic method. It is based on a bit values transformation according to both a certain Boolean function and a specific scheme of correspondence between MSB and LSB. The scheme of correspondence is considered as a secret key. The proposed method should be used for protection of large amounts of secret graphical data.

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