Papers by Ali Paşaoğlu (Pashaei)
2025 4th International Conference on Sentiment Analysis and Deep Learning (ICSADL), 2025
This paper investigates the effect of midterm and short quizzes on the success scores at the end ... more This paper investigates the effect of midterm and short quizzes on the success scores at the end of the course through machine learning methods. Data from 3,427 students in the Faculty of Engineering and Natural Sciences of Istanbul Rumeli University, recorded from the year 2019 to 2024, were analyzed, and of that, 1,547 records were qualified for machine learning after applying specific filtering criteria. Due to insufficient data, 6,300 synthetic records were generated using the Generative Adversarial Networks (GAN) method. To ensure high-quality data generation and stable training, a Wasserstein GAN with Gradient Penalty (WGAN-GP) was implemented, enhancing the synthetic dataset's diversity and reliability. In this paper, the algorithms of Random Forest (RF), AdaBoost, Linear Regression (LR), K-Nearest Neighbors (KNN), and Support Vector Machines (SVM) were used for the classification and prediction of course success. Among these, the most accurate performance, quantified for example by R² score, Mean Absolute Error and Mean Squared Error, was given by RF, with a probability of being correct at 83.81%. The results indicate that midterm exams have a significantly stronger influence on predicting course success, while short quizzes play an important role in maintaining consistent student engagement and reinforcing foundational concepts. Future studies will aim for data diverseness by adding more features and comparing new methods, such as Artificial Neural Networks with hyperparameter optimization.
Wireless Power Transfer (WPT) has been drawing a lot of attention in the last ten years parallel ... more Wireless Power Transfer (WPT) has been drawing a lot of attention in the last ten years parallel with the market increase in electric vehicles. Although conductive charging methods are still the preferred ones, WPT-based charging systems are used as clean and flexible alternatives. At the center of these systems are the transmitting and receiving coils, and different coil types have been proposed in the literature. This study proposes a square-hexagonal hybrid coil structure to increase magnetic coupling by shaping the magnetic field. In addition, this design aims to minimize the coupling coefficient variation for misaligned coils which is one of the most significant problems in WPT systems. A 3D model of the coils was created and analyzed using ANSYS, Maxwell software. Compared to the conventional square coil structure the coupling coefficient of the proposed structure is less affected by misalignment on the x and y axes, and as a result, it has a better efficiency. In addition, a WPT system operating at 50 W, 85-kHz is designed and tested in a laboratory environment. The FEA analyses and experimental application results largely overlap, and accordingly, the coil-to-coil efficiency of our WPT system was 93.5% and the overall efficiency of the system was 87%.
International Journal on “Technical and Physical Problems of Engineering” (IJTPE), 2024
Considering the importance of aviation systems, especially flight simulator systems, we need seve... more Considering the importance of aviation systems, especially flight simulator systems, we need several power sources, which will be used as a complex in the form of a rack of power sources at the end of this article. One of these power sources is the 115 V 50 Hz and 5.5 A power source, which must have all the characteristics of a sensitive power source, including high protection, fast response, and insensitivity to noise and disturbance. In addition, the power supply should be designed such that it can be operated by the PLC and Control Panel system from any desired point by the command pulse of these systems. In addition, the power supply should have a suitable output for feedback and send it to commanding systems. Additionally, the power supply should have a suitable output for feedback and should be able to send it to the commanding systems. The maximum power of designed power supply is 650 W. also experimental result show the efficiency of proposed power supply is around %96. In this study, the simulation and construction of the device were performed in a laboratory environment and significant results were obtained.
In an electric power network, from view point of many consumers, power generation, and transmissi... more In an electric power network, from view point of many consumers, power generation, and transmission should become exactly without interruption. Because the distribution system relates directly to consumers so should have high reliability. Overcurrent relays are often used for primary protection of distribution lines and secondary protection of radial transmission lines. The main objective in protection systems is the rapid separation of minimum amount of equipment as much as possible and without operation interference. These should be done after error detection in the system. This paper proposes proper coordination of directional overcurrent relays (DOCR) based on Particle swarm optimization (PSO) algorithm with take into account of fault current direction restriction. The proposed algorithm has been tested in the standard IEEE 30 bus distribution system.
Elektrikli araçlara olan ilginin son yıllarda artması, elektrikli araçları daha pratik ve güvenil... more Elektrikli araçlara olan ilginin son yıllarda artması, elektrikli araçları daha pratik ve güvenilir şekilde kullanabilmek için yeni yöntem arayışlarını da beraberinde getirmiştir. Birçok uygulama alanında kullanımı gittikçe yaygınlaşan Kablosuz Güç Aktarım (KGA) Sistemleri, elektrikli araçların batarya dolum uygulamaları için yakın geleceğin seçeneği olarak öne çıkmaktadır. Bu çalışmada, 2.2 kW gücünde bir KGA sisteminin tasarımı gerçekleştirilmiş ve Maxwell Ansys-Simplorer ortamında yapılan birleşik benzetim çalışmaları ile 10 cm mesafeden güç aktarım verimi % 84 olarak elde edilmiştir.
PVLT-04 Renewable energy sources can be utilized together to supply the needs of houses. Gazi Uni... more PVLT-04 Renewable energy sources can be utilized together to supply the needs of houses. Gazi University Clean Energy Research and Application Center (TEMENAR) has built a mobile platform to study and promote renewable energy systems. The platform includes PV panels and a hydrogen fuel cell. In its current form these units operate independently. The purpose of this paper is to design a controller and DC-DC converters to efficiently operate the system.
Elektrikli araçların, enerji darboğazı ve çevre kirliliği sorunlarına bir çözüm olarak görülmesi ... more Elektrikli araçların, enerji darboğazı ve çevre kirliliği sorunlarına bir çözüm olarak görülmesi ile birlikte, bu araçların bataryalarının temassız sistemlerle şarj edilmesi düşüncesi yaygınlaşmaya başlamıştır. İlk olarak Nikola Tesla tarafından ortaya atılan temassız güç aktarımı düşüncesi, enerjinin, ortak bir çekirdek üzerinde bulunmayan iki sargı arasında, oldukça büyük bir hava aralığı üzerinden aktarılması ilkesine dayanmaktadır. Bu aktarımın verimli olabilmesi için her iki sargının da rezonans koşullarında çalışması gerekmektedir. Bu makalede, bu sistemlerin kısa bir tarihçesi verilmekte, çalışma ilkesi ve bileşenleri tanıtılmaktadır.
This paper investigates capability of kinetic energy regeneration during the electric vehicle (EV... more This paper investigates capability of kinetic energy regeneration during the electric vehicle (EV) speed reducing. In order to achieve this goal, an improved inverter for feeding the switched reluctance motor (SRM) as in-wheel running part of EV is proposes. A novel torque control method of SRM based on space vector modulationdirect torque control (SVM-DTC) via fuzzy logic controller (FLC) is used. By controlling speed of SRM and collecting the currents of reverse diodes from SRM windings to the battery, the state-of-charge (SOC) of the battery is enhanced. This leads to improved movement ability of EV during ECE-Driving-Cycle. The simulation results for two seconds show 0.2% enhancement of SOC when the proposed regenerative braking system is utilized. Obviously, for longer driving cycles, the amount of energy saving will be more. Hence, capability and feasibility of the proposed controlling method and regeneration system are validated.
Nanotechnology Perception, 2024
This research addresses the challenge of meeting increasing global energy demands while transitio... more This research addresses the challenge of meeting increasing global energy demands while transitioning from finite fossil fuel resources. The study focuses on optimizing a solar-wind-battery-diesel hybrid energy system using the Particle Swarm Optimization with Improved Inertia Weight (PSO-IIW) and Crow Search Optimization (CSO) algorithm. The research delves into detailed modeling of solar panels and wind turbines considering the vibrational aspects, incorporating factors such as solar radiation and wind speed for accurate system design. The study determines that diesel offers high energy density, surpassing gasoline by approximately 12.57 percentage points. The optimized hybrid system configuration includes 1,234 solar panels, 78 wind turbines, and 567 batteries. Gas engine systems, costing less with higher fuel ratios below 345.23, are compared with gas turbine drives, which exhibit higher annual costs due to increased battery and solar panel requirements. Post-calibration, each drive achieves a nominal capacity between 123 and 432 kW, emphasizing uniformity across all drives. The research underscores the economic benefits of larger capacities, particularly in gas turbine and gas engine drives, resulting in reduced annual costs. Tailored for hot climate conditions, this study provides a comprehensive understanding of hybrid system design parameters, constraints, and input variables.
In this paper the speed control method of LIM,
which lead to optimal control characteristic of mo... more In this paper the speed control method of LIM,
which lead to optimal control characteristic of motor such
as thrust, flux and current, is proposed. The performance
of the proposed DTFC method is analyzed with
considering end-effect. DTFC is one of the improved
control methods which employ several PI controllers.
Proper adjustment of coefficients of the PI controller
plays an important role in the satisfactory performance of
control system that are determined using MATLAB
optimization functions. The obtained results show that the
DTFC method considering end-effect has led to a
considerable reduction in the FORCER flux and thrust
ripple near to 0.8%. The most important feature of DTFC
method is its performance robustness against the endeffect
phenomenon.
Three phase pulse width modulated voltage source rectifiers are widely used in uninterruptible po... more Three phase pulse width modulated voltage source rectifiers are widely used in uninterruptible power supplyand motor drive applications due to their low input current THD, adjustable input power factor,and bi-directional power transfer characteristics.In this paper utilization of this type of rectifier at the front end unit of an industrial type uninterrupted power supply is discussed. DC bus voltage is controlled through two high gain PI controllers. Sinusoidal Pulse Width Adjustable Triangle Wave Comparison for switching (SPWM) was selected as the control method. Unity power factor has been attained at the input along with very low THD values.
Conference Presentations by Ali Paşaoğlu (Pashaei)
In this paper the control method of LIM which lead to optimal control characteristic of motor suc... more In this paper the control method of LIM which lead to optimal control characteristic of motor such as thrust, flux and current has been proposed. The performance of the proposed DTFC method has been analyzed with considering end effect. To evaluate and approve improved controlling characteristics, the results of the DTFC method have been compared with the results obtained from Indirect Vector Control (IVC). IVC is one of the conventional control methods for LIM. The obtained results from MATLAB/Simulink show that the DTFC control method with considering end effect in comparison with the IVC has caused increase response time of speed about 50%. Also it has led to a considerable reduction in FORCER thrust ripples amplitude about 25%. The most important feature of DTFC method is its performance robustness against the end effect phenomena.
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Papers by Ali Paşaoğlu (Pashaei)
which lead to optimal control characteristic of motor such
as thrust, flux and current, is proposed. The performance
of the proposed DTFC method is analyzed with
considering end-effect. DTFC is one of the improved
control methods which employ several PI controllers.
Proper adjustment of coefficients of the PI controller
plays an important role in the satisfactory performance of
control system that are determined using MATLAB
optimization functions. The obtained results show that the
DTFC method considering end-effect has led to a
considerable reduction in the FORCER flux and thrust
ripple near to 0.8%. The most important feature of DTFC
method is its performance robustness against the endeffect
phenomenon.
Conference Presentations by Ali Paşaoğlu (Pashaei)
which lead to optimal control characteristic of motor such
as thrust, flux and current, is proposed. The performance
of the proposed DTFC method is analyzed with
considering end-effect. DTFC is one of the improved
control methods which employ several PI controllers.
Proper adjustment of coefficients of the PI controller
plays an important role in the satisfactory performance of
control system that are determined using MATLAB
optimization functions. The obtained results show that the
DTFC method considering end-effect has led to a
considerable reduction in the FORCER flux and thrust
ripple near to 0.8%. The most important feature of DTFC
method is its performance robustness against the endeffect
phenomenon.