IJET Vol. 4, Issue 2, June 2018

Bu koleksiyon için kalıcı URI

https://hdl.handle.net/11363/574

International Journal of Engineering Technologies (IJET) Dergisi / International Journal of Engineering Technologies (IJET)

Listeleniyor 1 - 10 / 10

International Journal of Engineering Technologies (IJET) Vol. 4, Issue 2, June 2018
(İstanbul Gelişim Üniversitesi Yayınları / Istanbul Gelisim University Press, 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
A Parallel Iterated Local Search Algorithm on GPUs for Quadratic Assignment Problem
(İstanbul Gelişim Üniversitesi Yayınları / Istanbul Gelisim University Press, 2018-06-27) 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.
Analysis of a Soft Switching High Voltage Gain DC/DC Boost Converter for PV Systems
(İstanbul Gelişim Üniversitesi Yayınları / Istanbul Gelisim University Press, 2018-06-27) 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.
A Novel Method for Increasing the Noise Immunity of Military Radio Systems via SelfTuned Phased Array Antennas
(İstanbul Gelişim Üniversitesi Yayınları / Istanbul Gelisim University Press, 2018-06-27) 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.
Investigation on Industry 4.0 and Virtual Commissioning
(İstanbul Gelişim Üniversitesi Yayınları / Istanbul Gelisim University Press, 2018-06-27) Aras, Akın; Ayaz, Murat; Özdemir, Engin; Abut, Nurettin
The human being had been busy with mostly agricultural economy for a long history when the steam was considered as a resource of kinetic energy. Using the steam machine in textile industry for the first time in the UK at the beginning of the 18th century, would be called as “Industrial Revolution” many decades later. Respectively, second industrial revolution with the invention and utilizing of electricity, then third industrial revolution with the rise of electronics and automation followed this period. And today, we have been facing with the fourth industrial revolution via internet of things, augmented reality, learning machines, etc. One of the key technologies that are improved in this period is virtual commissioning. The aim of this contribution is to suggest a definition to the Industry 4.0 with its historical precursors, and to give a focus on virtual commissioning technology as an output of the fourth industrial revolution.
A General Approach to Accreditation of Environmental Laboratories in Turkey
(İstanbul Gelişim Üniversitesi Yayınları / Istanbul Gelisim University Press, 2018-06-27) Akan, Perihan; Testik, Özlem Müge
In this study, the accreditation of environmental parameters and types of laboratories accredited by ISO 17025 Standard were compared. In Turkey, environmental laboratories were classified as public, private and university laboratories. Furthermore, environmental parameters considered in this study are water quality parameters and air quality parameters. In current study, 43 water quality parameters in university and 47 water quality parameters in public and private institutions were examined with regard to accredited laboratories in Turkey. Accredited water quality parameters in public and private institution as different from universities are Total Solid, Ammonia/Ammonia Nitrogen, Total Nitrogen, and Total Kjeldahl Nitrogen. As for air quality parameters, the number of air quality parameters accredited in public and private institutions is approximately twice as air parameters accredited in universities (42 and 26, respectively). The most accredited water parameter is pH, with total of 65, where 44 of them are private, 11 are public and 10 are university laboratories. Chemical Oxygen Demand (COD) and Suspended Solid (SS) are placed in the second order with total of 56. Here, 39 private, 10 public and 7 university laboratories are accredited in terms of COD and 40 private, 10 public and 6 university laboratories are accredited in terms of SS. Conductivity is next remarkable parameter with total of 53 institutions (37 private, 8 public and 8 university laboratories). In air parameters, the most accredited one is the SO2, with total of 52 (49 private, 2 public and 1 university laboratory).
Investigation of Natural Frequency for Continuous Steel Bridges with Variable Cross-sections by using Finite Element Method
(İstanbul Gelişim Üniversitesi Yayınları / Istanbul Gelisim University Press, 2018-06-27) Sağlık, Hüseyin; Doran, Bilge; Balkaya, Can
This paper mainly focuses on the natural frequencies of steel I-girder continuous-span bridges with straight haunched sections. The finite element analysis is performed to model dynamic behaviour of bridges by using CSIBridge package. Continuous-span bridges (two to six) with straight haunched section are considered. All the dimensions used for generating bridge models are designed according to AASHTO LRFD Standards. Effect of various parameters such as span length, the depth ratios between haunched cross-section to mid-span cross-section (r), the length ratio between haunched section to span (?), span configuration and steel girder arrangement on natural frequencies are investigated by numerically generating one hundred fifty three bridge models. “r” and “?” values are set to be 0.5 - 2.0 and 0.1 - 0.5. The analysis results are given and discussed for the natural frequency of continuous-span composite steel bridges with straight haunched section.
Information Systems for Repair Alternatives and Initial Cost Estimation of Damaged Building Structures
(İstanbul Gelişim Üniversitesi Yayınları / Istanbul Gelisim University Press, 2018-06-27) Balkaya, Can
The evaluation of existing structures for repair and strengthening results in the application of the most economical and effective repair techniques. The main focus is the existing buildings in seismic areas. The method of repair or strengthening depends on the damaged structural system, structural (life safety) issues, applicable seismic building code requirements, restrictions in available methods, and architectural and construction requirements. The consideration of new techniques, previous technical information on repair methods, experience of experts, and updated cost information are important in the evaluation. The most cost-effective schemes cannot be determined by choosing the most economical means to repair each component; an integrated approach is necessary. Also, recently the use of computers and networks to share the information are increasing. A knowledge-based information system has been developed for the integrated solutions. The level of damage is determined from the damage and structural information. In the evaluation, major damage conditions are grouped as ground damage, foundation damage and superstructure damage, and then these groups are divided into subgroups. Each repair method is represented by a specific format to determine the damage information index. The developed software is a self-modifying and learning system as a result of the data stored for common types of damaged buildings. The use of information systems results in rapid and effective initial cost estimation of repair methods.
Comparative Experimental FWA & FOWA Aggregated VLCSPPs' LUR Estimation for GIS Based VEED
(İstanbul Gelişim Üniversitesi Yayınları / Istanbul Gelisim University Press, 2018-06-27) Saraçoğlu, Burak Ömer
Today, the solar power conversion technologies are the photovoltaics (PV), the concentrated solar power (CSP), and the concentrated photovoltaics (CPV). All of these technologies need sufficient amount of appropriate land. In the Supergrids and the Global Grid, the large sized power plants play the key role, so that this study only focuses on the very large solar power plants (VLSPP). The VLSPPs are defined as the power plants that have the installed power of 1.000 MW (peak in PV) or more in this study. There isn't any solar power plant in this size on the world by 2015. Hence, the solar land use requirements should be studied, analyzed and estimated for each solar power technology. This study investigates only the very large concentrated solar power plants (VLCSPPs). Under the unsharp conditions, a fuzzy weighted average/weight averaging (fuzzy WA) aggregated and an ordered fuzzy weighted average/weight averaging (fuzzy OWA) aggregated solar land use requirement models on worldwide basis are built for the land use requirement (LUR) prediction in the geospatial information system investigation studies (GIS) at the very early engineering design (VEED) phase. These two models are presented in a comparative way. Five experimental criteria (direct normal irradiance: DNI, engineering design year, net installed power, cooling method, storage capacity) are only included in these models. This study and its findings will be a good start to design a VLCSPP in the Supergrids and the Global Grid in the following few years.
Application of Genetic Algorithm to Solar Panel Efficiency; A Case Study of Port-Harcourt Metropolis
(İstanbul Gelişim Üniversitesi Yayınları / Istanbul Gelisim University Press, 2018-06-26) Uhunmwangho, Roland; Leesi, Berebon Victor; Big-Alabo, Ameze
This study focuses on the evaluation of solar panel efficiency used within Port Harcourt environment. A major factor affecting the efficiency of solar panels is the difference in region or weather and the ability of the solar panel to convert incident radiation into electrical energy. Solar panels have varying efficiency levels under different weather conditions. Most times solar panels fall short of expected efficiencies. It is therefore important to have adequate knowledge of the performance characteristics of a panel under specific weather to ensure maximum output. For this research work, the panel evaluated is a 125W Polycrystalline solar panel made of Gallium Arsenide. The efficiency of the panel is calculated and recorded. The weather data for Port-Harcourt is collected from the center for data collation Rivers State University. The peak radiation value obtained from the weather data for the year under consideration is used to evaluate the efficiency and Genetic Algorithm is used to determine the optimal parameter of the cells making up the panel to obtain an optimized cell to improve the efficiency of the panel. To do this the cell initial properties is extracted and tabulated genetic algorithm is then used to improve this properties achieving better efficiency in the process.

Güncel Gönderiler