Browsing Faculty of Engineering by Author "4"
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Adaptive DCO-OFDM for underwater visible light communications
Elamassie, Mohammed; Karbalayghareh, Mehdi; Miramirkhani, Farshad; Uysal, Murat (IEEE, 2019-04)Visible light communication (VLC) has been introduced as a complementary technology to acoustic communications for underwater applications. Underwater VLC can achieve much higher data rates sufficiently high for real-time ... -
An antenna for implanted device systems
Zincircioglu, Emircan; Pekdemir, İsmail; Rzayew, Rafiq; Ilıksu, Emre; Dede, Merve; İmeci, Ş. T.; Durak, T. (IEEE, 2017)In this study, we designed and simulated an embedded spiral-shaped microstrip patch antenna for medical biotelemetry applications. Important design parameters were studied to understand their effect on the antenna performance. ... -
A custom-design atmospheric channel emulator for the performance evaluation of free space optical communication systems
Kebapci, Burak; Miramirkhani, Farshad; Nouri, Hatef; Uysal, Murat (IEEE, 2017)In this paper, we present our custom design atmospheric channel emulator for free space optical (FSO) system evaluations in a controlled environment. Our emulator is in the form of an atmospheric chamber with dimensions ... -
Design of a solenoid based prototype injector for evaluation of electromagnetic parameters
Yağcı, Ayhan; Quresh, Muhammad Sarmad; Kuntuz, Mehmet Polat; Bebek, Özkan (IEEE, 2019)Injector is a pump and valve mechanism, that sprays liquid intermittently to intended volume. In this research, evaluation of the electromagnetic properties of a solenoid actuator used in the prototype injector systems has ... -
Development of an antagonistically actuated smart joint
Vahidyeganeh, Ali; Şimsek, Görkem Muttalip; Jabeen, Saher; Bebek, Özkan; Yapıcı, Güney Güven (Trans Tech Publications, 2017)Shape memory alloys with their phase transformation properties; have been broadly implemented in smart structures. In this study, a functional design is presented where two wires actuate antagonistically to achieve motion ... -
Discrete-time integral sliding mode control of a smart joint for minimally invasive surgeries
Jabeen, Saher; Yeganeh, Ali Vahid; Şimsek, Görkem Muttalip; Yapıcı, Güney Güven; Abidi, K.; Bebek, Özkan (IEEE, 2016)In this work, a shape memory alloy(SMA) actuator based joint (smart joint) is controlled using a discrete-time integral sliding mode (DISM) control to guide the motion of an active catheter. Controller is designed on the ... -
Effect of wiring and cabling topologies on the performance of distributed MIMO OFDM VLC systems
Narmanlıoğlu, Ömer; Kızılırmak, R. Ç.; Miramirkhani, Farshad; Safaraliev, Sadi; Sait, S. M.; Uysal, Murat (IEEE, 2019)Since most indoor spaces have multiple luminaires for illumination, for visible light communication (VLC) systems, multiple-input multiple-output (MIMO) communication emerges as a natural solution to improve the data rates ... -
Efficient FPGA implementation of field oriented control for 3-phase machine drives
Tüfekçi, Burak; Önal, Buğra; Dere, Hamza Yasir; Uğurdağ, Hasan Fatih (IEEE, 2020-09)This paper presents an FPGA implementation of Field Oriented Control (FOC) method with high switching frequency for 3-phase machine drives. A common architecture has been constructed for both BrushLess DC motors (BLDC) and ... -
Evaluating the mechanical behavior of ARB processed aluminum composites using shear punch testing
Aljashaami, Dhyai Hassan Jawad; Ghobadlou, Ali Hosseinzadeh; Mısırlı, Mustafa; Yapıcı, Güney Güven (Trans Tech Publications Ltd, 2020)Multi-layered metal composites have received considerable attention due to their improved mechanical and physical properties. In this study, Al6061/Al2024 composite was processed by accumulative roll bonding (ARB) as a ... -
Evaluation of linguistic and prosodic features for detection of Alzheimer’s disease in Turkish conversational speech
Khodabakhsh, Ali; Yesil, Fatih; Guner, Ekrem; Demiroğlu, Cenk (Springer Science+Business Media, 2015-12)Automatic diagnosis and monitoring of Alzheimer’s disease can have a significant impact on society as well as the well-being of patients. The part of the brain cortex that processes language abilities is one of the earliest ... -
Experimental evaluation of a software defined visible light communication system
Mohamed, Bassam Aly Abdelrahman; Elamassie, Mohammed; Kebapçı, Burak; Uysal, Murat (IEEE, 2020)Visible light communication (VLC) allows the dual use of light-emitting diodes (LEDs) for illumination and communication purposes. With its large bandwidth and immunity to electromagnetic interference, VLC can be used as ... -
An experimental investigation into frost accumulation over vertical finned and unfinned surfaces during impinging air flow
Öksüz, Enes Abdülhakim; Saygın, Alper; Başol, Altuğ Melik; Budaklı, M.; Arık, Mehmet (ASME, 2020)Frost formation on evaporators negatively affects the cooling performance of refrigerators. It increases the thermal resistance between the refrigerant and air leading to a reduction in the system cooling capacity. In this ... -
Experimental investigation of lens combinations on the performance of vehicular VLC
Mohamed, Bassam Aly Abdelrahman; Elamassie, Mohammed; Eldeeb, Hossıen Badr; Uysal, Murat (IEEE, 2020)With the increasing adoption of LEDs in outdoor light sources such as traffic lights, street lights and vehicle headlamps, visible light communication (VLC) has the promise to become a major enabler for vehicle-to-vehicle ... -
Fast multiplier generator for FPGAs with LUT based partial product generation and column/row compression
Kakacak, Ahmet; Guzel, Aydın Emre; Cihangir, Ozan; Gören, S.; Uğurdağ, Hasan Fatih (Elsevier, 2017)We present a new parallel integer multiplier generator for FPGAs. It combines (i) a new Generalized Parallel Counter (GPC) grouping algorithm for column compression with (ii) a LUT based partial product generation, is (iii) ... -
Fast one- and two-pick fixed-priority selection and muxing circuits
Tosun, Mustafa; Özkan, M. Akif; Güzel, Aydin Emre; Uğurdağ, Hasan Fatih (IEEE, 2016)Priority encoders and arbiters usually drive multiplexers (muxes). Latency optimization of priority encoders and multiplexer trees has usually been handled separately in the literature. However, in some applications with ... -
Fault masking as a service
Gülcü, Koray; Sözer, Hasan; Aktemur, Tankut Barış; Ercan, Ali Özer (Wiley, 2014-07)In SOA, composite services depend on a set of partner services to perform their tasks. These partner services may become unavailable because of system and/or network faults, leading to an increased error rate for the ... -
FPGA implementation of a dense optical flow algorithm using altera openCL SDK
Ulutaş, Umut; Tosun, Mustafa; Levent, Vecdi Emre; Büyükaydın, D.; Akgün, T.; Uğurdağ, Hasan Fatih (Springer International Publishing, 2017)FPGA acceleration of compute-intensive algorithms is usually not regarded feasible because of the long Verilog or VHDL RTL design efforts they require. Data-parallel algorithms have an alternative platform for acceleration, ... -
High power series elastic actuator development for torque-controlled exoskeletons
Yıldırım, Mehmet Can; Kansızoğlu, Ahmet Talha; Şendur, Polat; Uğurlu, Regaip Barkan (Springer Nature, 2019)This paper presents the development procedures of a high power series elastic actuator that can be used in torque-controlled exoskeleton applications as a high-fidelity torque source. In order to provide a high torque ... -
Impact of junction temperature over forward voltage drop for red, blue and green high power light emitting diode chips
Muslu, Ahmet Mete; Özlük, Burak; Tamdoğan, Enes; Arık, Mehmet (IEEE, 2017)Commercially available light emitting diodes (LEDs) that have high efficiencies and long lifetime are offered in advanced packaging technologies. Many cooling systems were developed for current LED systems that enable a ... -
Integrated engineering and architecture for the energy efficient academic buildings
Mengüç, Mustafa Pınar; Somuncu, Yasemin; Çağlayan, Şahin; Özcan, Saadet; Sefer, Burak; Simitli, Utku (International Building Performance Simulation Association, 2015-12)In this paper, we outline a comprehensive and integrated collaboration between engineering and architecture team to build an energy efficient building. Within the framework of the EU FP7 project, titled NEED4B, we have ...
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