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Articles 5311 - 5340 of 10319
Full-Text Articles in Physical Sciences and Mathematics
Design And Analysis Of A Magnetically Levitated Axial Flux Bldc Motor For A Ventricular Assist Device (Vad), Ahmet Fenerci̇oğlu
Design And Analysis Of A Magnetically Levitated Axial Flux Bldc Motor For A Ventricular Assist Device (Vad), Ahmet Fenerci̇oğlu
Turkish Journal of Electrical Engineering and Computer Sciences
penetration of magnetic field into blood. Magnetic parameters, axial pull force, and torque of the proposed motor have been analyzed by the 3-dimensional finite elements method (3D-FEM) to confirm the motor design. Solutions are compared with maglev and non-maglev designs.
Authentication Of Uncertain Data Based On K-Means Clustering, Levent Ünver, Taflan İmre Gündem
Authentication Of Uncertain Data Based On K-Means Clustering, Levent Ünver, Taflan İmre Gündem
Turkish Journal of Electrical Engineering and Computer Sciences
No abstract provided.
A Location Aware History-Based Approach For Network Selection In Heterogeneous Wireless Networks, Amir Hossein Jafari, Hadi Shahriar Shahhoseini
A Location Aware History-Based Approach For Network Selection In Heterogeneous Wireless Networks, Amir Hossein Jafari, Hadi Shahriar Shahhoseini
Turkish Journal of Electrical Engineering and Computer Sciences
Efficient decision making in vertical handoff and network selection algorithms improves users' quality of service and helps users meet service requirements, anywhere and at any time. Hence, in this paper, a user-centric network selection algorithm is proposed, utilizing the estimated reputation of the available candidate networks based on user location and combined experienced users' utility. User utility is defined based on 1) quality of service, 2) monetary cost, and 3) energy consumption metrics. In the proposed history aware-based user location algorithm, the past experience of users for available networks is considered to estimate the future utility that a user can …
Heart Sound Signal Classification Using Fast Independent Component Analysis, Yücel Koçyi̇ği̇t
Heart Sound Signal Classification Using Fast Independent Component Analysis, Yücel Koçyi̇ği̇t
Turkish Journal of Electrical Engineering and Computer Sciences
No abstract provided.
Single And Multiple Precision Sequential Large Multipliers For Field-Programmable Gate Arrays, Ali̇ Şentürk, Mustafa Gök
Single And Multiple Precision Sequential Large Multipliers For Field-Programmable Gate Arrays, Ali̇ Şentürk, Mustafa Gök
Turkish Journal of Electrical Engineering and Computer Sciences
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Sensorless Field Oriented Control Of Nonsinusoidal Flux-Distribution Permanent Magnet Synchronous Motor With A Fem Based Ann Observer, Eyyüp Öksüztepe, Zeki̇ Omaç, Mehmet Polat, Hakan Çeli̇k, Ahmet Hakan Selçuk, Hasan Kürüm
Sensorless Field Oriented Control Of Nonsinusoidal Flux-Distribution Permanent Magnet Synchronous Motor With A Fem Based Ann Observer, Eyyüp Öksüztepe, Zeki̇ Omaç, Mehmet Polat, Hakan Çeli̇k, Ahmet Hakan Selçuk, Hasan Kürüm
Turkish Journal of Electrical Engineering and Computer Sciences
No abstract provided.
An Efficient Robust Watermarking Scheme For Varying Sized Blocks, Navneet Yadav, Kulbir Singh
An Efficient Robust Watermarking Scheme For Varying Sized Blocks, Navneet Yadav, Kulbir Singh
Turkish Journal of Electrical Engineering and Computer Sciences
No abstract provided.
Iris And Eye Corner Detection By Processing Internal Webcam Images, Bülent Turan, Hali̇l İbrahi̇m Eski̇kurt
Iris And Eye Corner Detection By Processing Internal Webcam Images, Bülent Turan, Hali̇l İbrahi̇m Eski̇kurt
Turkish Journal of Electrical Engineering and Computer Sciences
the eye regions of laptop users. To achieve this, the iris and eye corners are detected by processing the images captured by the standard internal webcam of a laptop. In addition, an artificial neural network (ANN) is used for determining the eye region. Hereby, the iris and eye corners can be detected in the determined eye region. In the study, 107 user images are captured by using a laptop's internal camera under different light intensities, environments, viewpoints, and positions. These images are used for the training of the ANN. Two different methods are used for the iris detection. In the …
Optimal Dispatchable Dg Allocation In A Distribution Network Considering Load Growth With A Mixed-Pso Algorithm, Peyman Karimyan, Behrooz Vahidi, Mehrdad Abedi, Seyed Mohammad Ahadi
Optimal Dispatchable Dg Allocation In A Distribution Network Considering Load Growth With A Mixed-Pso Algorithm, Peyman Karimyan, Behrooz Vahidi, Mehrdad Abedi, Seyed Mohammad Ahadi
Turkish Journal of Electrical Engineering and Computer Sciences
No abstract provided.
A Wavelet-Based Feature Set For Recognizing Pulse Repetition Interval Modulation Patterns, Kenan Gençol, Nuray At, Ali̇ Kara
A Wavelet-Based Feature Set For Recognizing Pulse Repetition Interval Modulation Patterns, Kenan Gençol, Nuray At, Ali̇ Kara
Turkish Journal of Electrical Engineering and Computer Sciences
No abstract provided.
A New Combined Method For Rms Calculation Based On Wavelet Packet And Hilbert Transform, Rahmat Allah Hooshmand, Javad Modarresi
A New Combined Method For Rms Calculation Based On Wavelet Packet And Hilbert Transform, Rahmat Allah Hooshmand, Javad Modarresi
Turkish Journal of Electrical Engineering and Computer Sciences
No abstract provided.
A Novel Approach For Automatic Blood Vessel Extraction In Retinal Images: Complex Ripplet-I Transform And Complex Valued Artificial Neural Network, Murat Ceylan, Hüseyi̇n Yaşar
A Novel Approach For Automatic Blood Vessel Extraction In Retinal Images: Complex Ripplet-I Transform And Complex Valued Artificial Neural Network, Murat Ceylan, Hüseyi̇n Yaşar
Turkish Journal of Electrical Engineering and Computer Sciences
No abstract provided.
Design And Implementation Of Small Power Switched Reluctance Generator-Based Wind Energy Conversion System, Jayapragash Rasakannu, Chellamuthu Chinnagounder
Design And Implementation Of Small Power Switched Reluctance Generator-Based Wind Energy Conversion System, Jayapragash Rasakannu, Chellamuthu Chinnagounder
Turkish Journal of Electrical Engineering and Computer Sciences
No abstract provided.
Bayesian Compressive Sensing Framework For Spectrum Reconstruction In Rayleigh Fading Channels, Nadia Iqbal, Asad Mahmood, Sajjad Hussain, Abdul Ghafoor
Bayesian Compressive Sensing Framework For Spectrum Reconstruction In Rayleigh Fading Channels, Nadia Iqbal, Asad Mahmood, Sajjad Hussain, Abdul Ghafoor
Turkish Journal of Electrical Engineering and Computer Sciences
No abstract provided.
A New Electronically Tunable First-Order All-Pass Filter Using Only Three Nmos Transistors And A Capacitor, Firat Yücel, Erkan Yuce
A New Electronically Tunable First-Order All-Pass Filter Using Only Three Nmos Transistors And A Capacitor, Firat Yücel, Erkan Yuce
Turkish Journal of Electrical Engineering and Computer Sciences
No abstract provided.
Thermal Model Of Oil Power Transformers With A Tap Changer, Zoran Radakovic, Stefan Tenbohlen
Thermal Model Of Oil Power Transformers With A Tap Changer, Zoran Radakovic, Stefan Tenbohlen
Turkish Journal of Electrical Engineering and Computer Sciences
No abstract provided.
Parametric-Based Mobility For Providing Opportunistic Geocasting In Spatially Separated Wireless Sensor Networks, Selvi Ravindran, Narayanasamy Palanisamy, Vetriselvi Vetrian
Parametric-Based Mobility For Providing Opportunistic Geocasting In Spatially Separated Wireless Sensor Networks, Selvi Ravindran, Narayanasamy Palanisamy, Vetriselvi Vetrian
Turkish Journal of Electrical Engineering and Computer Sciences
Uneven deployment and environment constraint leads to the formation of a spatially separated wireless sensor network (SS-WSN). Most of the traditional WSN architectures consist of static nodes that are densely deployed over a sensing area and are fully connected. SS-WSN is a group of disjoint subnetworks where connectivity is generally maintained by energy rich mobile nodes (ERMN), which roam about from one subnetwork to another. We propose an algorithm whereby the mobility of ERMN helps in distributing the geo message opportunistically in the region of interest. The routing consists of two phases: (1) transmission of the geo message from the …
A Designed Converter For Minimizing Srm Torque Ripple With Controlled Boost Capacitor Automatically, Loghman Samani, Mahdi Abdolhamidi, Amir Rashidi, Sayed Morteza Saghaiannezhad
A Designed Converter For Minimizing Srm Torque Ripple With Controlled Boost Capacitor Automatically, Loghman Samani, Mahdi Abdolhamidi, Amir Rashidi, Sayed Morteza Saghaiannezhad
Turkish Journal of Electrical Engineering and Computer Sciences
Direct instantaneous torque control (DITC) is one way of controlling torque in switched reluctance motors. Despite the presence of DITC control, torque ripple at nominal or higher speeds is considerable due to the back emf increasing. To overcome this drawback, many converters have been proposed. In most convertors proposed for fast excitation in DITC, controlling of boost capacity is an important problem. This paper presents a DITC for a switched reluctance motor using a proposed converter to reduce the torque ripple with controlled boost capacitor automatically. The proposed converter reduces the torque ripple at rated or higher speeds and no …
Novel Dynamic Partial Reconfiguration Implementations Of The Support Vector Machine Classifier On Fpga, Hanaa Hussain, Khaled Benkrid, Hüseyi̇n Şeker
Novel Dynamic Partial Reconfiguration Implementations Of The Support Vector Machine Classifier On Fpga, Hanaa Hussain, Khaled Benkrid, Hüseyi̇n Şeker
Turkish Journal of Electrical Engineering and Computer Sciences
The support vector machine (SVM) is one of the highly powerful classifiers that have been shown to be capable of dealing with high-dimensional data. However, its complexity increases requirements of computational power. Recent technologies including the postgenome data of high-dimensional nature add further complexity to the construction of SVM classifiers. In order to overcome this problem, hardware implementations of the SVM classifier have been proposed to benefit from parallelism to accelerate the SVM. On the other hand, those implementations offer limited flexibility in terms of changing parameters and require the reconfiguration of the whole device. The latter interrupts the operation …
An Improved Digital Image Watermarking Scheme Using The Discrete Fourier Transform And Singular Value Decomposition, Justin Varghese, Saudia Subash, Omer Bin Hussain, Krishnan Nallaperumal, Mohammed Ramadan Saady, Mohamed Samiulla Khan
An Improved Digital Image Watermarking Scheme Using The Discrete Fourier Transform And Singular Value Decomposition, Justin Varghese, Saudia Subash, Omer Bin Hussain, Krishnan Nallaperumal, Mohammed Ramadan Saady, Mohamed Samiulla Khan
Turkish Journal of Electrical Engineering and Computer Sciences
The paper presents an improved digital image watermarking algorithm by incorporating the discrete Fourier transform (DFT) and singular value decomposition (SVD). The Fourier transformed carrier image is decomposed into four different frequency subbands by the proposed onion peel decomposition (OPD) algorithm and the SVD-based watermarking scheme is applied to attach the transformed watermark in all four carrier subbands. The proposed inverse OPD algorithm together with inverse DFT is utilized to reconstruct the watermarked image from the frequency blocks. The watermark extraction algorithm is simple and it performs the inverse of watermarking process. The experimental analysis on different images shows that …
Energy-Efficient Mobile Cluster-Head Data Collection Model For Wireless Sensor Networks, Nidhi Gautam, Sanjeev Sofat, Renu Vig
Energy-Efficient Mobile Cluster-Head Data Collection Model For Wireless Sensor Networks, Nidhi Gautam, Sanjeev Sofat, Renu Vig
Turkish Journal of Electrical Engineering and Computer Sciences
Wireless sensor networks have grown from homogeneous network architecture to heterogeneous networks for the improvement of network efficiency and lifetime. This paper exhibits a mobile cluster-head data collection (MCHDC) model for heterogeneous wireless networks. The MCHDC model illustrates the mobility pattern of mobile cluster-head nodes in a controlled environment with uniform and nonuniform deployment of mobile elements in the area of observation. It focuses on the threshold velocity for movement of mobile elements in the network area. In this paper the effects of data sending rate, network area, sensor node density, and cluster-head node density on energy efficiency of the …
Push-Pull Cache Consistency Mechanism For Cooperative Caching In Mobile Ad Hoc Environments, Lilly Sheeba Selvin, Yogesh Palanichamy
Push-Pull Cache Consistency Mechanism For Cooperative Caching In Mobile Ad Hoc Environments, Lilly Sheeba Selvin, Yogesh Palanichamy
Turkish Journal of Electrical Engineering and Computer Sciences
Maintaining data consistency between data cached by a mobile client and data residing in the data server is a major issue in a wireless mobile environment. In this paper, we propose a push-pull cache consistency (2P2C) mechanism, with the intention of increasing the rate of serving requestors with recent up-to-date information or data from the cache of the intermediate nodes that are exact replicas of the data present in the origin server. This is a hybrid scheme that does not rely entirely either on the server or on the mobile client for maintaining consistency. Here we employ a registration process. …
Design And Implementation Of A Compact Avionics Instrument For Light Aviation, Mustafa Emre Aydemi̇r
Design And Implementation Of A Compact Avionics Instrument For Light Aviation, Mustafa Emre Aydemi̇r
Turkish Journal of Electrical Engineering and Computer Sciences
In this study, a low-cost compact avionics instrument has been designed and implemented for light aviation vehicles such as ultralight airplanes, hang glider-trikes, and paramotors. At the moment there are a few commercial products that provide flight data and vehicle statuses such as altitude, temperature, fuel level, and engine hours meter. However, due to low production rates, customization for different air vehicles, and complex electronics and signal processing hardware, these instruments are generally far from being affordable; their cost may even be more than that of the air vehicle. This study presents a novel approach such that recent state-of-the-art hardware …
Reduction Of Torque Ripple In Induction Motor By Artificial Neural Multinetworks, Fati̇h Korkmaz, İsmai̇l Topaloğlu, Hayati̇ Mamur, Murat Ari, İlhan Tarimer
Reduction Of Torque Ripple In Induction Motor By Artificial Neural Multinetworks, Fati̇h Korkmaz, İsmai̇l Topaloğlu, Hayati̇ Mamur, Murat Ari, İlhan Tarimer
Turkish Journal of Electrical Engineering and Computer Sciences
Direct torque control is used in the high performance control of induction motors. The most frequently faced problem of it is high torque ripples. In this study, a new approach based on artificial neural multinetworks is presented to overcome the problem. Two different artificial neural networks were suggested instead of vector selection and sector determination processes in the conventional direct torque control method. The conventional and the proposed control methods were evaluated on an induction motor through an experimental set. It was observed that the speed and torque responses of the proposed method were better than those of the conventional …
Behavior Of Metamaterial-Based Microwave Components For Sensing And Heating Of Nanoliter-Scale Volumes, Muhammed Sai̇d Boybay
Behavior Of Metamaterial-Based Microwave Components For Sensing And Heating Of Nanoliter-Scale Volumes, Muhammed Sai̇d Boybay
Turkish Journal of Electrical Engineering and Computer Sciences
Metamaterial-based microwave components are among the state-of-the-art heater and sensor designs for microfluidic systems. The miniaturization and energy-focusing abilities of the metamaterial-based components make it possible to adopt microwave components operating at wavelengths in the order of 10 cm for microfluidic systems. Microwave systems are particularly advantageous for point-of-care and high-throughput applications due to their high speed of operation, very low instrumentation cost, ability to selectively and internally heat specimens, and ability of label-free sensing. In this study, the efficiency and behavior of microwave components designed for heating and sensing small volumes in the scale of nanoliters are studied. In …
Modeling And Performance Optimization Of Photovoltaic And Thermal Collector Hybrid System, Di̇lşad Engi̇n, Meti̇n Çolak
Modeling And Performance Optimization Of Photovoltaic And Thermal Collector Hybrid System, Di̇lşad Engi̇n, Meti̇n Çolak
Turkish Journal of Electrical Engineering and Computer Sciences
In this paper, the hybrid photovoltaic/thermal collector (PV/T) system's electrical and thermal efficiency was examined by stating a mathematical model and developing a prototype of the system. To enhance the electrical efficiency, the cell temperature of the PV module was decreased with cooling and the heated fluid could be used for low heating applications. For this purpose, a PV/T system was modeled and constructed using a thermal collector placed beneath the photovoltaic panel where the excess heat and solar radiation through the transparent PV module was the input of the thermal collector. A transparent solar module was used in order …
Detection Of Online Pd Signals In Xlpe Cables Using The Bhattacharyya Distance, Amir Ghaedi, Moein Moeini Aghtaie, Abuzar Ghaffari
Detection Of Online Pd Signals In Xlpe Cables Using The Bhattacharyya Distance, Amir Ghaedi, Moein Moeini Aghtaie, Abuzar Ghaffari
Turkish Journal of Electrical Engineering and Computer Sciences
Partial discharge (PD) signal detection can be used for insulation monitoring of power system equipment. Online PD detection as a main task of insulation monitoring for different power system equipment is a difficult procedure when environmental noise is taken into account. This paper proposes a new scheme based on the Bhattacharyya distance approach with the main goal of detecting the PD signals in cross-linked polyethylene cables. The proposed method, as a preprocessing tool, can be used for detection of PD signals in a noisy environment. The simplicity and the accuracy of the Bhattacharyya distance approach are the 2 main advantages …
Common-Mode Emi Evaluation Of Forward Converter With Various Core-Reset Schemes, Mohammad Rouhollah Yazdani, Nahid Amini Filabadi
Common-Mode Emi Evaluation Of Forward Converter With Various Core-Reset Schemes, Mohammad Rouhollah Yazdani, Nahid Amini Filabadi
Turkish Journal of Electrical Engineering and Computer Sciences
In switching power converters, electromagnetic emissions can interfere with the normal operation of the converter or other adjacent systems. Among various power converters, forward converters are widely used at low and medium powers that need a transformer core-reset scheme. In this paper, a prediction procedure for conducted common-mode EMI of a single-switch forward converter is presented, and common-mode EMI levels are predicted considering heat-sink parasitic capacitors and main PCB parasitic elements. The accuracy of prediction results is examined via experimental results. In addition, effects of conventional passive core-reset schemes on the conducted EMI are evaluated via experimental results. Along with …
A Current-Based Simple Analog Mppt Circuit For Pv Systems, Bülent Büyükgüzel, Murat Aksoy
A Current-Based Simple Analog Mppt Circuit For Pv Systems, Bülent Büyükgüzel, Murat Aksoy
Turkish Journal of Electrical Engineering and Computer Sciences
A new single pilot-sensor maximum power point tracking (MPPT) system, consisting of a buck type DC/DC converter, was developed. It is controlled by an analog-based unit. The main difference between the proposed MPPT system and other systems is that the short circuit current of the pilot-PV module in our system is used to control the DC/DC converter. The circuit of the proposed system does not utilize an expensive digital signal processor nor a microcontroller; hence, the cost and the complexity of the system are reduced.
A Current Feedback Control Strategy For Parallel-Connected Single-Phase Inverters Using A Third-Order General-Integrator Crossover Cancellation Method, Yuan Huang, An Luo
A Current Feedback Control Strategy For Parallel-Connected Single-Phase Inverters Using A Third-Order General-Integrator Crossover Cancellation Method, Yuan Huang, An Luo
Turkish Journal of Electrical Engineering and Computer Sciences
Virtual impedance is usually introduced to the control system of parallel inverters in order to change the inverter equivalent output impedance and to enhance control accuracy and power sharing. In this paper, a current feedback control strategy using a third-order general-integrator crossover-cancellation method that can be implemented in a virtual impedance loop is proposed. This method consists of 2 parts: a crossover-cancellation feedback network, which achieves the band-pass effect, and a multilevel TOGI-OSG link, which acts as a filter. Compared with the conventional virtual impedance method, the proposed method can avoid derivation of output current, reduce system calculating burden, and …