• Quantum probe of time-like naked singularities for electrically and magnetically charged black holes in a model of nonlinear electrodynamics 

  Mangut, Mert; Gürtuğ, Özay (World Scientific Connecting Great Minds, 2020)

  The time-like naked singularities of the electrically and magnetically charged black hole solutions obtained in a model of nonlinear electrodynamics proposed by Kruglov is investigated within the framework of quantum ...

• A simple method for a capacitor’s ESR measurement 

  Abut, Nurettin (Power Electronics, 2017)

  Capacitors are classified according to their dielectric’s type. Electrolytic capacitors are popular in power electronic circuits, due to their high volumetric efficiency and excellent price performance ratio.[1] Unfortunately, ...

• A small dc-ac inverter by using cross-connected charge pumps 

  Fujisaki, Haruka; Ishibashi, Takaaki; Eguchi, Kei (IJEETC, 2019)

  This paper introduces a Switched-Capacitor (SC) DC-AC inverter with cross-connected topology. By cross connecting two charge pump DC-DC converters, the proposed SC DC-AC inverter can achieve small size with a grounded ...

• A high voltage gain sc dc-dc converter based on cross-connected fibonacci-type converter 

  Eguchi, Kei; Pongwatd, Sawai; Fujisaki, Haruka (IEEE, 2018)

  For energy harvesting systems, this paper presents a high voltage gain switched-capacitor (SC) converter with cross-connected topology. By cross-connecting two Fibonacci-type DC-DC converters, the proposed SC DC-DC converter ...

• Gravitational lensing in rotating and twisting universes 

  Gürtuğ, Özay; Mangut, Mert; Halilsoy, Mustafa (Elsevier, 2021)

  Gravitational lensing caused by the gravitational field of massive objects has been studied and acknowledged for a long period of time. In this paper, however, we propose a different mechanism where the bending of light ...

• Design of a cross-connected charge pump for energy harvesting systems 

  Eguchi, Kei; Fujisaki, Haruka; Oota, Ichirou (IOP Publishing, 2017)

  For energy harvesting systems, a novel charge pump with cross-connected structure is proposed in this paper. Owing to the cross-connected structure, the proposed charge pump can offer the output voltage to the output ...

• The development of an led lighting circuit using high gain buck-boost converters 

  Kuwahara, Kyoka; Ishibashi, Takaaki; Eguchi, Kei (IJEETC, 2019)

  his paper presents an LED driver using high gain buck-boost converters. By combining a traditional buck-boost converter and a Switched-Capacitor (SC) DC-DC converter with flying capacitors, the proposed driver can achieve ...

• The development of a step-down switched-capacitor inverter without flying capacitors and full-bridge circuits 

  Eguchi, Kei; Abe, Hiroto; Ishibashi, Takaaki (Elsevier, 2020)

  Recently, an inductor-less inverter attracts many researchers’ attention, because the inductor-less design can provide not only small size but also small electromagnetic interference (EMI). In this paper, we propose a novel ...

• Gravitational lensing in a model of nonlinear electrodynamics: the case for electrically and magnetically charged compact objects 

  Gürtuğ, Özay; Mangut, Mert (Wiley Online Library, 2020)

  This paper aims to investigate the astrophysical applicability of the electrically and magnetically charged black hole solutions obtained in a model of nonlinear electrodynamics proposed by Kruglov (Ann. Phys. Berlin ...

• A multi-input cross-connected charge pump for mobile applications 

  Eguchi, Kei; Ishibashi, Takaaki; Oota, Ichirou (IEEE, 2018)

  To develop efficient mobile application systems, a multi-input cross-connected charge pump is proposed in this paper. By combing ambient energy and battery energy, the proposed charge pump achieves a long working-life of ...

• Comparison of different dc motor modeling techniques 

  Eguchi, Kei (Bio-Byword Scientific Publishing, 2018)

  A DC motor is the most widely used actuator in the industry, especially for robotic applications such as position control of robot manipulators. When motor is used in high performance close loop motion control systems, ...

• Implementation of inductor-less 13-level inverter topology with reduced number of required component 

  Eguchi, Kei; Bevrani, Hassan; Shafiee, Qubad; Do, Wanglok (Elsevier, 2020)

  This paper presents an inductor-less multilevel inverter (MLI) with a 13-level ac output. The proposed MLI consists of only 11 switches, 2 capacitors, and 2 input sources. Owing to the inductor-less symmetrical topology, ...

• Reduction of inrush current in a shockwave non-thermal food processing system using an exponential clock pulse generator 

  Eguchi, Kei; Shibata, Akira; Abe, Hiroto; Oota, Ichirou (Molecular Diversity Preservation International, 2020)

  Recently, shockwave food processing is drawing much attention as a low-cost non-thermal food process technique. In shockwave non-thermal food processing, underwater shockwaves are generated by a high voltage generator. ...

• Design of a dual-input cross-connected charge pump utilizing scavenged energy 

  Eguchi, Kei; Kozono, Yutaka; Ishibashi, Takaaki (Elsevier, 2020)

  This paper presents a novel dual-input cross-connected charge pump utilizing scavenged energy. The proposed converter has two input sources: a battery input and a scavenged energy input. Unlike existing charge pumps, the ...

• A step-down nesting-type ac–ac converter combined with voltage equalizers and switched-capacitor simple converters 

  Eguchi, Kei; Rubpongse, Ratanaubol; Shibata, Akira; Ishibashi, Takaaki (Elsevier, 2019)

  In this paper, we present an inductor-less direct ac–ac converter with improved nesting-type topology. Unlike existing direct ac–ac converters, the proposed ac–ac converter combines a voltage equalizer and a switched-capacitor ...

• Hybrid spiral stc-hedge algebras model in knowledge reasonings for robot coverage path planning and its applications 

  Van Pham, Hai; Abut, Nurettin; Kandilli, İsmet (Molecular Diversity Preservation International, 2019)

  Robotics is a highly developed field in industry, and there is a large research effort in terms of humanoid robotics, including the development of multi-functional empathetic robots as human companions. An important function ...

• Experiment of a high voltage gain switched capacitor dc-dc converter based on a cross-connected fibonacci-type converter 

  Rubpongse, Ratanaubol; Do, Wanglok; Eguchi, Kei (Innovative Computing, Information and Control, 2019)

  To make an efficient converter for energy harvesting systems, a high voltage gain cross-connected switched-capacitor (SC) DC-DC converter is presented in this paper. By using a cross-connected structure based on Fibonacci-type ...

• Kharitonov’s theorem: A good starting point for robust control 

  Abut, Nurettin (Sage Journals, 2019)

  Advanced robust controller design methods such as: H∞, μ synthesis, or linear matrix inequality require advanced mathematics which makes these techniques difficult topics for final year projects. A robust controller (for ...

• Pole placement based on derivative of states 

  Abut, Nurettin (Institute of Advanced Science Extension, 2016)

  State feedback is one of the important concepts in control theory. There are well defined methods like Ackermann’s formula and Bass-Gura formula to find required gain matrix (K) which place close loop poles at the desired ...

• KUCA: Kocaeli University Converter Analysis simulation software in power electronics 

  Abut, Nurettin (Institute of Advanced Science Extension, 2016)

  This paper describes how a circuit simulation program can assist in teaching the principles of power electronics to undergraduate students. The authors have used Kocaeli University Converter Analysis suite (KUCA) as an aid ...

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