IJET Vol. 4, Issue 2, June 2018
https://hdl.handle.net/11363/574
International Journal of Engineering Technologies (IJET) Dergisi kayıtlarını içerir.2024-03-28T13:45:23ZInternational Journal of Engineering Technologies (IJET) Vol. 4, Issue 2, June 2018
https://hdl.handle.net/11363/2068
International Journal of Engineering Technologies (IJET) Vol. 4, Issue 2, June 2018
Bayram, Mustafa
Dear Colleagues,
On behalf of the editorial board of International Journal of Engineering Technologies (IJET), I
would like to share our happiness to publish the fourteenth issue of IJET. My special thanks are
for members of Editorial Board, Publication Board, Editorial Team, Referees, Authors and other
technical staff.
Please find the fourteenth issue of International Journal of Engineering Technologies at
http://ijet.gelisim.edu.tr or http://dergipark.gov.tr/ijet. We invite you to review the Table of
Contents by visiting our web site and review articles and items of interest. IJET will continue to
publish high level scientific research papers in the field of Engineering Technologies as an
international peer-reviewed scientific and academic journal of Istanbul Gelisim University.
Thanks for your continuing interest in our work,
Professor Mustafa BAYRAM
Istanbul Gelisim University
mbayram@gelisim.edu.tr
http://ijet.gelisim.edu.tr
http://dergipark.gov.tr/ijet
Printed ISSN: 2149-0104
e-ISSN: 2149-5262
2018-01-01T00:00:00ZA Parallel Iterated Local Search Algorithm on GPUs for Quadratic Assignment Problem
https://hdl.handle.net/11363/583
A Parallel Iterated Local Search Algorithm on GPUs for Quadratic Assignment Problem
Özçetin, Erdener; Öztürk, Gürkan
In this study, quadratic assignment problem, which is a hard combinatorial optimization problem, is examined to solve by a new approach. To reach the optimal results by using mathematical programming approaches cannot be possible even for some sorts of small and middle scaled problems in a reasonable time interval. Huge amounts of data are being progressed simultaneously by graphics processing units located on computers’ graphics card. Therefore, a parallel iterated local search algorithm has been proposed to solve the quadratic assignment problem by using graphics processing units’ simultaneously progressing property. This parallel algorithm and the sequential one on central processing units are tested and compared for test problems in literature. Indeed, it is observed that the parallel algorithm works averagely 6.31 times faster for Skorin problems and 11.93 times faster for Taillard problems faster than sequentially one.
2018-06-27T00:00:00ZAnalysis of a Soft Switching High Voltage Gain DC/DC Boost Converter for PV Systems
https://hdl.handle.net/11363/582
Analysis of a Soft Switching High Voltage Gain DC/DC Boost Converter for PV Systems
Al-Hajm, Sarah; Uçar, Mehmet
This paper presents an analysis of a non-isolated soft switching high voltage gain DC/DC boost converter by using a coupling inductor, voltage quadrupler and active clamp circuit for Photovoltaic (PV) systems. The main advantage of this converter, coupled inductor with voltage quadrupler circuit is used to decrease voltage stress in semiconductor switches and providing high voltage gain. Therefore, low voltage valued and low on-resistance MOSFETs can be used to decrease on-state losses. The reverse recovery and high frequency turn off losses is reduced for achieving Zero-Current Switching (ZCS) in all diodes. Voltage spike caused by leakage inductance of the coupled inductor is minimized by means of the active clamp circuit. Thus, Zero-Voltage Switching (ZVS) turn on of all MOSFET switches are achieved. The Perturb and Observe (P&O) method is utilized in this study to obtain maximum power from the PV system. In order to show the effectiveness of the converter, PSIM simulations are realized under various irradiance cases. The conversion efficiency is obtained about 95.97% at full load from the simulation results.
2018-06-27T00:00:00ZA Novel Method for Increasing the Noise Immunity of Military Radio Systems via SelfTuned Phased Array Antennas
https://hdl.handle.net/11363/581
A Novel Method for Increasing the Noise Immunity of Military Radio Systems via SelfTuned Phased Array Antennas
İsayev, Yalçın; Aydemir, Mustafa Emre; İsayev, Ahed; Mammadova, L.H.
The noise immunity of radio systems is one of the most important topics in military science. In this article, the methods for increasing the noise immunity of military-purpose radio systems in connection with increasing the accuracy and reliability requirements of transmitted and received information using modern information technologies has been investigated. A novel analysis method to increase the noise immunity of radio systems for military purposes has been presented.
2018-06-27T00:00:00Z