An International Journal of Optimization and Control: Theories & Applications (IJOCTA) http://ijocta.org/index.php/files <table> <tbody> <tr> <td width="230"> <p><img title="ijocta_newr_511" src="http://web-kurumsal.balikesir.edu.tr/~ijocta/public/site/images/ikucukkoc/ijocta_newr_511.png" alt="ijocta_newr_511" width="163" height="211" /><br />ISSN: 2146-0957<br />eISSN: 2146-5703</p> <p> </p> <p><strong>EDITOR IN CHIEF</strong> <br /><span style="color: #306754;"><a href="https://www.atlas.edu.tr/muhendislik-ve-doga-bilimleri-fakultesi-eski/prof-dr-ramazan-yaman/" target="_blank" rel="noopener">YAMAN, Ramazan</a> </span><br />Istanbul Atlas University / Turkey</p> <p><a href="http://ijocta.org/index.php/files/about/editorialTeam"><em>View the full editorial board</em></a></p> </td> <td> <p><strong>Aims and Scope</strong><br /><em>An International Journal of Optimization and Control: Theories &amp; Applications</em> is a scientific, peer-reviewed, open-access journal that publishes original research papers and review articles of high scientific value in all areas of applied mathematics, optimization and control. It aims to focus on multi/inter-disciplinary research into the development and analysis of new methods for the numerical solution of real-world applications in engineering and applied sciences. The basic fields of this journal cover mathematical modeling, computational methodologies and (meta)heuristic algorithms in optimization, control theory and their applications. Note that new methodologies for solving recent optimization problems in operations research must conduct a comprehensive computational study and/or case study to show their applicability and practical relevance.</p> <p><strong>Journal Topics</strong> <br />The topics covered in the journal are (not limited to): <br />Applied Mathematics, Financial Mathematics, Control Theory, Optimal Control, Fractional Calculus and Applications, Modeling of Bio-systems for Optimization and Control, Linear Programming, Nonlinear Programming, Stochastic Programming, Parametric Programming, Conic Programming, Discrete Programming, Dynamic Programming, Nonlinear Dynamics, Stochastic Differential Equations, Optimization with Artificial Intelligence, Operational Research in Life and Human Sciences, Heuristic and Metaheuristic Algorithms in Optimization, Applications Related to Optimization in Engineering.</p> </td> </tr> <tr> <td> </td> <td> </td> </tr> </tbody> </table> en-US <p>Articles published in IJOCTA are made freely available online immediately upon publication, without subscription barriers to access. All articles published in this journal are licensed under the Creative Commons Attribution 4.0 International License (<a href="https://creativecommons.org/licenses/by/4.0/legalcode">click here</a> to read the full-text legal code). This broad license was developed to facilitate open access to, and free use of, original works of all types. Applying this standard license to your work will ensure your right to make your work freely and openly available.</p><p>Under the Creative Commons Attribution 4.0 International License, authors retain ownership of the copyright for their article, but authors allow anyone to download, reuse, reprint, modify, distribute, and/or copy articles in IJOCTA, so long as the original authors and source are credited.</p><p><strong>The readers are free to:</strong></p><ul><li><strong>Share</strong> — copy and redistribute the material in any medium or format</li><li><strong>Adapt</strong> — remix, transform, and build upon the material</li><li>for any purpose, even commercially.</li><li>The licensor cannot revoke these freedoms as long as you follow the license terms.</li></ul><p><strong>under the following terms:</strong></p><ul><li><strong>Attribution</strong> — You must give <strong>appropriate credit</strong>, provide a link to the license, and <strong>indicate if changes were made</strong>. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.</li></ul><ul><li><strong>No additional restrictions</strong> — You may not apply legal terms or <strong>technological measures</strong> that legally restrict others from doing anything the license permits.</li></ul><p> <a href="http://creativecommons.org/licenses/by/4.0/" rel="license"><img src="https://i.creativecommons.org/l/by/4.0/88x31.png" alt="Creative Commons License" /></a> This work is licensed under a <a href="http://creativecommons.org/licenses/by/4.0/" rel="license" target="_blank">Creative Commons Attribution 4.0 International License</a>.</p> ramazan.yaman@atlas.edu.tr (Prof. Dr. Ramazan YAMAN) nozdemir@balikesir.edu.tr (Prof. Dr. Necati ÖZDEMİR) Sun, 12 Jun 2022 00:00:00 +0300 OJS 3.3.0.8 http://blogs.law.harvard.edu/tech/rss 60 Optimizing seasonal grain intakes with non-linear programming: An application in the feed industry http://ijocta.org/index.php/files/article/view/1158 <p class="Abstract1"><span class="Abstract1Char"><span lang="EN-US">In the feed sector, 95% of the input costs arise from the supply of raw materials used in feed production. The selling price is determined by competition in free market conditions. Due to the use of similar technologies and the very small share of production costs in total costs, it is unlikely that a competitive advantage will be gained through innovations in production. Between 30% and 50% of grain products are used in feed ration analysis. Cereals can only be harvested at a certain time of the year. Due to this limited time frame, feed production enterprises have to balance their financial burdens with their operational needs while making their annual stocks. The study was carried out to cover all the relevant businesses of the company, which has feed factories in four regions of Turkey. Based on the season data of the year 2020-2021, the grain purchase planning for the year 2021-2022 was tried to be optimized with non-linear programming. While creating the mathematical model, grain prices, interest rates, production needs according to production planning, sales according to sales forecasts, factory stocking capacities, licensed warehouse rental, transportation, handling and transshipment costs were taken into account.</span></span></p> <p class="Abstract1"><span class="Abstract1Char"><span lang="EN-US">With this unique paper, in the cattle feed production sector, storage, transportation and handling costs will be minimized. Cost advantage will be provided with optimum purchase planning in the season. According to the grain pricing forecast and market data for the 2021-2022 season, </span></span><span lang="EN-US">model can provide a cost advantage of 0.7%. Model <span class="Abstract1Char">will also provide insight to the managers for additional storage space investments.</span></span></p> Alperen Ekrem Çelikdin Copyright (c) 2022 Alperen Ekrem Çelikdin http://creativecommons.org/licenses/by/4.0 http://ijocta.org/index.php/files/article/view/1158 Sun, 12 Jun 2022 00:00:00 +0300 Rotor design optimization of a synchronous generator by considering the damper winding effect to minimize THD using grasshopper optimization algorithm http://ijocta.org/index.php/files/article/view/1181 <p class="Abstract1"><span class="Abstract1Char"><span lang="EN-US">The aim of this study is to calculate the optimum factor levels for the design parameters namely slot pitch, center slot pitch, and damper width to keep the magnetic flux density distribution in a desired range while minimizing the total harmonic distortion (THD). For this purpose, the numerical simulations are performed in the Maxwell environment. Then by the aid of regression modeling over this simulation results; the mathematical equations between the responses (THD and magnetic flux density distribution) and the factors are calculated. After the modeling phase, grasshopper optimization algorithm (GOA) is run through these regression equations to determine the optimum values of the rotor design parameters (factors). The confirmations are also performed in the Maxwell environment and the result indicated that the THD is minimized and the magnetic flux density distribution on the teeth is kept in a desired range.</span></span></p> Aslan Deniz Karaoglan, Deniz Perin Copyright (c) 2022 Aslan Deniz Karaoglan, Deniz Perin http://creativecommons.org/licenses/by/4.0 http://ijocta.org/index.php/files/article/view/1181 Mon, 13 Jun 2022 00:00:00 +0300 A belief-degree based multi-objective transportation problem with multi-choice demand and supply http://ijocta.org/index.php/files/article/view/1166 <p>This paper focusses on the development of a Multi-choice Multi-objective Transportation Problem (MCMOTP) in the uncertain environment. The parameters associated with the objective functions in MCMOTP are regarded as uncertain variables and the other parameters associated with supply capacity and demand requirements are considered under the multi-choice environment. In this paper, two ranking criteria have been utilized to convert the uncertain objectives into their crisp form. Using these two ranking criteria for the uncertain MCMOTP model, two deterministic models have been developed namely, Expected Value Model (EV Model) and Optimistic Value Model (OV Model). The multi-choice parameters in the constraints are converted to a single choice parameters with the help of binary variable approach. The EV and OV models are solved directly in the LINGO 18.0 software using minimizing distance method and fuzzy programming technique. At last, a numerical illustration is provided to demonstrate the application and algorithm of the models. The sensitivity of the objective functions in OV Model is also examined with respect to the confidence levels to investigate variation in the objective functions.</p> Vandana Kakran, Jayesh Dhodiya Copyright (c) 2022 Vandana Kakran, Jayesh Dhodiya http://creativecommons.org/licenses/by/4.0 http://ijocta.org/index.php/files/article/view/1166 Tue, 12 Jul 2022 00:00:00 +0300 Optimal matchday schedule for Turkish professional soccer league using nonlinear binary integer programming http://ijocta.org/index.php/files/article/view/1161 <p>Sports scheduling problems are interesting optimization problems that require the decision of who play with whom, where and when to play. In this work, we study the sports scheduling problem faced by the Turkish Football Federation. Given the schedule of games for each round of the season, the problem is to determine the match days with the goal of having a fair schedule for each team. The criteria we employ to establish this fairness are achieving an equal distribution of match days between the teams throughout the season and the ideal assignment of games to different days in each round of the tournament. The problem is formulated as a nonlinear binary integer program and is solved optimally for each week. Our results indicate that significant improvements over the existing schedule can be achieved if the optimal solution is implemented.</p> Yasin Göçgün, Niyazi Onur Bakır Copyright (c) 2022 Yasin Göçgün, Niyazi Onur Bak?r http://creativecommons.org/licenses/by/4.0 http://ijocta.org/index.php/files/article/view/1161 Tue, 12 Jul 2022 00:00:00 +0300 Financial efficiency of companies operating in the Kosovo food sector: DEA and DEAHP http://ijocta.org/index.php/files/article/view/1227 <p>Data Envelopment Analysis (DEA) evaluates a large number of input and output variables using mathematical programming techniques and analyzes the effectiveness of similar decision making units (DMU). Unlike traditional methods, the most important advantage of DEA is that the weights of input and output variables can be defined by the analyzer. In this study, the limitations of the DEA weights were determined using the AHP, which considers expert opinion. In addition, an alternative judgment scale was used for the Saaty judgment scale, which is used as a standard in the AHP method, and thus a more sensitive analysis was performed. There have been studies dealing with the comparison of judgment scales, but few studies on consistency sensitivity are needed. This point has also been addressed in this study. Subsequently, the financial efficiency of 27 companies operating in the food sector in Kosovo was evaluated with the weight-restricted DEA model, first created using the unweighted DEA model and then the AHP model, and the two models were compared. This paper is the first one of its kind since there are no previous studies regarding the examination of the financial efficiency of companies operating in the Kosovo food sector based on the DEAHP method.</p> Esma Canhasi Kasemi Copyright (c) 2022 Esma Canhasi Kasemi http://creativecommons.org/licenses/by/4.0 http://ijocta.org/index.php/files/article/view/1227 Tue, 12 Jul 2022 00:00:00 +0300 Uncertainty-based Gompertz growth model for tumor population and its numerical analysis http://ijocta.org/index.php/files/article/view/1208 <p>For treating cancer, tumor growth models have shown to be a valuable resource, whether they are used to develop therapeutic methods paired with process control or to simulate and evaluate treatment processes. In addition, a fuzzy mathematical model is a tool for monitoring the influences of various elements and creating behavioral assessments. It has been designed to decrease the ambiguity of model parameters to obtain a reliable mathematical tumor development model by employing fuzzy logic.The tumor Gompertz equation is shown in an imprecise environment in this study. It considers the whole cancer cell population to be vague at any given time, with the possibility distribution function determined by the initial tumor cell population, tumor net population rate, and carrying capacity of the tumor. Moreover, this work provides information on the expected tumor cell population in the maximum period. This study examines fuzzy tumor growth modeling insights based on fuzziness to reduce tumor uncertainty and achieve a degree of realism. Finally, numerical simulations are utilized to show the significant conclusions of the proposed study.</p> Aadil Rashid Sheergojri, Pervaiz Iqbal, Praveen Agarwal, Necati Ozdemir Copyright (c) 2022 Aadil Rashid Sheergojri, Pervaiz Iqbal, Praveen Agarwal, Necati Ozdemir http://creativecommons.org/licenses/by/4.0 http://ijocta.org/index.php/files/article/view/1208 Thu, 14 Jul 2022 00:00:00 +0300 Localization of an ultra wide band wireless endoscopy capsule inside the human body using received signal strength and centroid algorithm http://ijocta.org/index.php/files/article/view/1146 <p>Wireless capsule endoscopy (WCE) is used for imaging and diagnosing diseases in the gastrointestinal (GI) system. The location of the disease detected by WCE is still an important problem. Location information is very important for the surgical or drug treatment of the detected disease. In this study, RSS-based centroid algorithm has been used in order to accurately predict the capsule position on a sample data set. The effect of different parameters such as number of sensors used on the proposed mathematical model, location of sensors on positioning is analyzed in detail. The results show that a precise position detection is possible with fewer sensors positioned correctly. As a result, the positioning error with the correctly selected sensors is reduced by approximately 55%. In addition, the performance of the proposed method was compared with the classical centroid algorithm and more than 50% improvement was achieved.</p> Memduh Suveren, Rustu Akay, Muzaffer Kanaan Copyright (c) 2022 Memduh Suveren, Rustu Akay, Muzaffer Kanaan http://creativecommons.org/licenses/by/4.0 http://ijocta.org/index.php/files/article/view/1146 Tue, 26 Jul 2022 00:00:00 +0300 Genocchi polynomials as a tool for solving a class of fractional optimal control problems http://ijocta.org/index.php/files/article/view/1263 <p>In this research, we use operational matrix based on Genocchi polynomials to obtain approximate solutions for a class of fractional optimal control problems. The approximate solution takes the form of a product consisting of unknown coefficients and the Genocchi polynomials. Our main task is to compute the numerical values of the unknown coefficients. To achieve this goal, we apply the initial condition of the problem, the Tau and Lagrange multiplier methods. We do error analysis as a means to study the behaviour of the approximate solutions.</p> Haleh Tajadodi, Hossein Jafari, Mahluli Naisbitt Ncube Copyright (c) 2022 Haleh Tajadodi, Hossein Jafari, Mahluli Naisbitt Ncube http://creativecommons.org/licenses/by/4.0 http://ijocta.org/index.php/files/article/view/1263 Wed, 27 Jul 2022 00:00:00 +0300 A new generalization of Rhoades' condition http://ijocta.org/index.php/files/article/view/1112 <p>In this paper, our aim is to obtain a new generalization of the well-known Rhoades' contractive condition. To do this, we introduce the notion of an S-normed space. We extend the Rhoades' contractive condition to S-normed spaces and define a new type of contractive conditions. We support our theoretical results with necessary illustrative examples.</p> Nihal Taş, Nihal Özgür Copyright (c) 2022 Nihal Ta?, Nihal Özgür http://creativecommons.org/licenses/by/4.0 http://ijocta.org/index.php/files/article/view/1112 Wed, 27 Jul 2022 00:00:00 +0300 A numerical scheme for the one-dimensional neural field model http://ijocta.org/index.php/files/article/view/1219 <p>Neural field models, typically cast as continuum integro-differential equations, are widely studied to describe the coarse-grained dynamics of real cortical tissue in mathematical neuroscience. Studying these models with a sigmoidal firing rate function allows a better insight into the stability of localised solutions through the construction of specific integrals over various synaptic connectivities. Because of the convolution structure of these integrals, it is possible to evaluate neural field model using a pseudo-spectral method, where Fourier Transform (FT) followed by an inverse Fourier Transform (IFT) is performed, leading to a new identical partial differential equation. In this paper, we revisit a neural field model with a nonlinear sigmoidal firing rate and provide an efficient numerical algorithm to analyse the model regarding finite volume scheme. On the other hand, numerical results are obtained by the algorithm.</p> Aytul Gokce, Burcu Gurbuz Copyright (c) 2022 Aytul Gokce, Burcu Gurbuz http://creativecommons.org/licenses/by/4.0 http://ijocta.org/index.php/files/article/view/1219 Fri, 29 Jul 2022 00:00:00 +0300