SDG 9 · Sanayi, Yenilikçilik ve Altyapı · SDG · Erzincan Binali Yıldırım Üniversitesi

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ArticleYalnız künye2020/r/ebyu/15188
A novel active snubber cell for soft-switched isolated PWM half-bridge converter
Bodur, Haci; Yesilyurt, Huseyin; Akboy, Erdem; Ting, Naim Suleyman
This paper introduces a novel modular active snubber cell for isolated half-bridge converters with ease of control. The novel snubber cell can achieved soft switching for all semiconductors at the proposed converter. The switches in the converter are derived simultaneously by the normal pulse-width modulation signals. The introduced snubber cell has a quite simple structure and ease of control. In this converter, the main switches turn on with zero current switching and turn off with zero voltage switching. Besides, there is no extra voltage stresses on the power elements. The proposed half-bridge DC–DC converter is analyzed in detail and its theoretical analysis is verified with a prototype having 50 A–25 V output values at 80 kHz frequency.
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ArticleYalnız künye2020/r/ebyu/15114
An Investigation of Turkey’s Competitiveness on Different Products Groups in Automotive Sector via Revealed Comparative Advantage Index
Soyyiğit, Semanur; Yavuzaslan, Kiymet; Bilgin, MH; Danis, H; Karabulut, G; Gozgor, G
Competitive power in international trade is one of the most desirable targets of countries in today’s globalized world. Thus, the importance of international competitiveness that has been a fundamental issue since the rise of the international economic theory is increasing for various products. Within this scope, it is so prominent to analyze product groups in which countries have comparative advantages from past to present in order to detect the problems and to determine the existing situation. In this context, with reference to the importance of countries in the existing global structure, investigation of comparative advantage of Turkey in the production of motor vehicles constitutes the subject of this study. Revealed Comparative Advantage (RCA) index, which has been suggested by Liesner first and then developed by Balassa, is used to determine the comparative advantage of Turkey in the production of motor vehicles from 1989 to 2016. Findings indicate that new competitors exist in automotive sector and that the competitiveness of Iran and the Eastern European countries will be determinant in the medium-and long-term position of the Turkish automotive industry in global markets.
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ArticleAçık Erişim2020/r/ebyu/15032
Energy transformation without using filter on high resistive load
Can, Erol
In this paper, 9-level, 17-level, 19-level, 21-level, 27-level, and 39- level inverters with SPWM are presented. According to a switching function, the high-multilevel inverter design has been described since a new multi-level inverter structure is considered. The multilevel inverter structure is designed with placing switches and sources on levels. Pulse width modulation, controlling switches in the inverter structure, is also produced by comparison between triangles and sinus signals. Operating sequences of the switches are given in the table in order to demonstrate the inverter operation characteristic with the produced signals. Then, mathematical equations are formed by considering an operation of switches on the load. In simulations and experiments, the 9-level, 17-level, 19-level, 21-level, 27-level, and 39-level inverters are performed on the resistance (R) and inductance (L) loads with different resistance, because it is difficult to generate current and voltage with an acceptable harmonic distortion on the impedances which have high ohmic values. After applications of experimentation and simulation, the obtained results are compared with other published papers of results and the international IEEE standard, which is 5% for harmonic distortions of creating currents and voltages.
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ArticleYalnız künye2020/r/ebyu/14969
A two-stage stochastic model for location planning of temporary medical centers for disaster response
Oksuz, Mehmet Kursat; Satoglu, Sule Itir
Devastating effects of disasters and global crises on people increases the importance of humanitarian logistics studies for pre and post-disaster stages. Location planning of Temporary Medical Centers/field hospitals is one of the most important problems for disaster response. We aimed to determine the location and number of temporary medical centers in case of disasters by considering the locations of the existing hospitals, casualty classification (triage), capacities of medical centers and possibilities of damage to the roads and hospitals. Besides, we aimed to assign different casualty classes to these medical centers for emergency medical response by considering the distances between disaster areas and medical centers. For this purpose, a two-stage stochastic programming model was developed. The proposed model finds an optimal TMC location solution while minimizing the total setup cost of the TMCs and the expected total transportation cost by considering casualty types, demand, possibilities of damage to the roads and hospitals, and distance between the disaster areas and the medical cente2rs. In the model, α-reliability constraints for the expected number of unassigned casualties were also used. Besides, the model was reformulated without triage, in order to understand the impact of casualty classification on the solution of the problem. We performed a real case study for the district of Kartal expected to be widely damaged in the possible Istanbul earthquake, and a sensitivity analysis was made. The analysis of the results offer some managerial insights associated with the number of temporary medical centers’ needed, their locations, and additional hospital capacity requirements.
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ArticleAçık Erişim2020/r/ebyu/14717
Digital capitalism and coal mine workers
Bakioğlu, Akın
One hundred and seventy-five years ago, in his book titled The Condition of the Working Class in England, Engels wrote about the ways in which the mine workers were ex-ploited within the capitalist system. Classical economists believed that with the improvements in technology, capitalism would create egalitarian employment opportunities for everyone. In their opinion, the coal which served as a catalyser for the classical modernization had no place in the age of digital technology. However nowadays, especially in various developing countries such as Turkey, in the production of coal mines, the existing working conditions are the same as the ones that were applicable one hundred and seventy years ago and the exploitation of the labour of the workers continues. Notwithstanding, digital technologies serve for the control of capitalist production instead of the wellbeing of the workers. Coal has always had an im-portant role in the historical continuity and discontinuity periods of capitalism. Considering the unbreakable link between the exploitation of nature and capitalist accumulation of capital, giv-ing up coal and switching to renewable energy sources does not seem possible. The dialectical link between technology consumption and technology production is also one of the most im-portant reasons for coal production to continue. This article argues that in Turkey today, the technology used in coal mine craft prioritises the control of labour rather than prioritizing the working comfort of the mine workers.
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Book ChapterYalnız künye2020/r/ebyu/14591
Overview of machine learning approaches for wireless communication
Ensari, Tolga; Günay, Melike; Nalçakan, Yağiz; Yildiz, Eyyüp
Machine learning is one of the most popular research areas, and it is commonly used in wireless communications and networks. Security and fast communication are among of the key requirements for next generation wireless networks. Machine learning techniques are getting more important day-by-day since the types, amount, and structure of data is continuously changing. Recent developments in smart phones and other devices like drones, wearable devices, machines with sensors need reliable communication within internet of things (IoT) systems. For this purpose, artificial intelligence can increase the security and reliability and manage the data that is generated by the wireless systems. In this chapter, the authors investigate several machine learning techniques for wireless communications including deep learning, which represents a branch of artificial neural networks.
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ArticleYalnız künye2020/r/ebyu/14586
Multi-criteria decision-based safety evaluation using microsimulation
Bayrak, Osman Ünsal; Bayata, Halim Ferit
The choice of intersection type in a road network is one of the most important decisions to be made in transportation engineering. Capacity and level of service are the two main factors considered in the type of intersection design, but safety and economy should also be taken into account when determining the intersection type since these are equally important. A number of parameters can be used to evaluate the performance of an intersection, including travel time, average delay, queue length, fuel consumption and vehicle exhaust emissions. Adding safety and construction costs to these parameters makes decision-making more difficult. In this study, the analytic hierarchy process (AHP) was used as a multi-criteria decision approach to overcome this problem. Three intersection types were modelled and tested using Vissim software in line with the above parameters. An AHP model was then generated using the Vissim results and the AHP results and applicability were analysed.
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ArticleAçık Erişim2020/r/ebyu/14413
Effect of Anchor Bars on Seismic Behavior of Infilled Walled Frames
Kumbasaroglu, Atila
User-defined plastic hinge properties obtained experimentally are used to examine the structural behavior of bare, infilled walled frames with and without anchor bars in reinforced concrete (RC) buildings. Experimentally obtained moment-curvature relationships of structural members (i.e., beams and columns) are used to determine the plastic hinge properties of each section. Three building frames are modeled and examined for time-history analysis using 20 ground-motion records. Seismic performance levels of three buildings are analyzed to determine the effects of anchor bars. Limit states at each performance level are defined, and the multi-record incremental dynamic analysis curves are obtained; 16%, 50%, and 84% fractal curves are obtained for each case. Cumulative distribution functions are constructed to summarize the varieties in the roof-drift ratios of three RC buildings with different frame types for design-based and maximum-considered earthquake hazards. It is found that, with an increased spectral acceleration of ground motions, the probability of exceeding the performance levels of infilled walled frames in reinforced buildings is reduced with the help of anchor bars. The increased stiffness of RC buildings with infilled wall frames exhibiting lower ductility is re-gained by the absorption energy of the anchor bars.
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Review ArticleAçık Erişim2019/r/ebyu/22409
Measurement of financial performance of energy companies in bist by sd and waspas methods
Bağcı, Haşim; Yıgıter, Sule Yüksel
Gradual growth of World population, the policies carried out on energy resources, the risk of depletion of fossil energy resources and damage caused by fossil energy resources to the ecological system accelerated the search of new energy sources. These searches have led energy companies to turn to renewable energy sources. There are energy companies that use renewable energy sources in our country like the other countries in the World. In this study, the financial performance of 15 energy companies that are registered to Borsa Istanbul between 2008 and 2017 were analysed, 16 financial statement items are taken into consideration as financial performance indicators. SD and WASPAS multi criteria decision making techniques were used in this study. As a result of the research, it is clearly visible that the company which has high financial performance has changed every year; however the company that has the lowest financial performance is generally Akenerji.
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ArticleAçık Erişim2019/r/ebyu/22322
BİST İmalat Sanayi Firmalarının Araştırma Ve Geliştirme Giderlerinin Piyasa Değeri Ve Firma Kârlılığı Üzerindeki Etkisi
Özer, Nevin; Öztürk, Meryem; Özer, Ali
Sürdürülebilir büyümenin firmalar açısından gerçekleştirilmesi hem paydaşlar hem de hissedarlar açısındanönemlidir. Bu noktada öne çıkan yaklaşım profesyonel yönetimden ziyade değer katan ve yenilikleri yakalayan yönetimtarzıdır. Bu yönetim tarzı ile katma değerli ürünler elde edilebilir bu da entelektüel varlıkların geliştirilmesi ile mümkünolabilecektir. Burada önemli olan bir husus geliştirilen entelektüel varlıkların taklit edilememesidir. Kopyalanamayan vekatma değeri olan ürün ve yaklaşımlar ancak araştırma ve geliştirme yatırımlarının bir sonucu olarak gerçekleştirilebilir.Ar-Ge kısa vadede gider olarak görülürken uzun vadede katma değerli ve yenilikçi süreçlerin ilk adımıdır. Bu bağlamdaçalışmanın amacı, hisse senetleri BİST’te işlem gören imalat sanayi firmalarının Ar-Ge harcamalarının piyasa değeri vekârlılıkları üzerindeki etkisini analiz etmektir. 2012-2017 yıllarını kapsayan çalışmada panel veri analizi kullanılmıştır.Çalışmanın sonucunda statik panel modeline göre Ar-Ge harcamalarının kârlılık ve piyasa değeri üzerinde etkisi olmadığı;dinamik panel modeline göre ise Ar-Ge harcamalarının hem kârlılık hem de piyasa değeri üzerinde pozitif etkisinin olduğutespit edilmiştir.
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ArticleAçık Erişim2019/r/ebyu/22248
Analysis of the Effects of Three Various Current Control Methods on BLDC Motors
Özgenel, Mehmet Cihat
Brushless direct current motors are very popular motors in a wide application area thanks to their superiorfeatures. Brushless motors are the most preferred motors in applications such as domestic, robotics, officemachines, medical, military and space applications, unmanned aerial vehicles applications because they meetthe special requirements of these applications. Brushless direct current (BLDC) motors have high volume torqueratio, high efficiency, fast dynamic response; they offer linear torque/speed characteristics. Speed control ofBLDC motors achieves by implementing pulse width modulation (PWM) technique. Various PWM controlmethods are put in to use for controlling of BLDC motor speed. These PWM methods have some certainadvantages and disadvantages. In this study, three current control PWM methods which are mostly used inpractices are examined. These are full conduction mode, independent and complementary PWM methods. Forthis purpose, three BLDC motor pre-drivers have been designed and manufactured and the effects of these threedrivers on the BLDC motor have been examined. It has been found that complementary PWM mode has givento BLDC motor fast dynamic response. Full conduction mode has drawn higher dc link current from DC powersupply. Independent PWM method performance is very close to complementary PWM method.
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ArticleAçık Erişim2019/r/ebyu/22240
Paslanmaya Maruz Kalmış Tam Ölçekli Betonarme Kolonların Monotonik Yükleme Etkisi Altında Yapısal Davranışlarının İncelenmesi: Korozyon Çalışmaları İçin Öneriler
Yalciner, Hakan; Mermit, Mehmet Fırat; Kohistani, Rameen; Karimi, Aqludin; Kumbasaroglu, Atila
Korozyona maruz kalmış betonarme yapıların sismik performanslarının tahmin edilmesi korozyona uğramamışyapılara göre daha zordur. Gerçekleştirilen bu deneysel çalışma ile birlikte korozyona maruz kalmış betonarmeelemanları üzerine yapılacak olan çalışmalara ışık tutulması amaçlanmıştır. Beş adet tam ölçekli betonarmekolonu hızlandırılmış korozyon yöntemi kullanılarak farklı korozyon oranları için paslandırılmıştır.Paslandırılmış betonarme kolonları sabit eksenel yük altında monotonik yüklemeye tabi tutularak, akma ve nihaiyükleri, süneklik oranları ve enerji yutma kapasiteleri deneysel olarak elde edilmiştir. Betonarme kolonlarındakigerçek korozyon oranları yükleme deneylerinden sonra betonarme kolonlarının kırılarak ve gömülü olan tümbetonarme donatılarının çıkartılması ile elde edilmiştir. Yapılan deneysel çalışma sonucunda, monotonikyüklemenin tersinir-tekrarlanır yüklemeye göre zayıf yönleri göz önüne alınan deprem indeksleri açısındandeğerlendirilmiştir. Elde edilen deneysel sonuçlar doğrultusunda ileriki korozyon çalışmaları için önemliönerilerde bulunulmuştur. Gerçekleştirilen bu çalışma kapsamında, paslanmış betonarme kolonlarınınmonotonik yükleme etkisi altında süneklik oranları ve enerji yutma kapasiteleri artan korozyon oranına bağlıolarak azalmıştır. Monotonik yükleme etkisi altında pasın belirli oranlarına kadar sağlamış olduğu sargı etkisive buna bağlı olarak deprem indekslerindeki artışlar net bir şekilde görülememiştir. Tek doğrultuda göçmemodu kabulü ile yapılacak olan sismik değerlendirmelerde kullanılmak üzere paslanmış betonarme kolonlarınsüneklik ve enerji yutma kapasitelerinin tahmin edilebilmesi için iki ampirik model geliştirilmiştir.
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ArticleAçık Erişim2019/r/ebyu/21880
SIFCON ile Üretilen Beton Yolların Bazı Mekanik Özelliklerinin Optimizasyonu
Bayata, Halim Ferit; Bayrak, Osman Ünsal; Bingöl, Muhammed Ziya
Son zamanlarda geliştirilen kompozit bir malzeme olan çimento bulamacı emdirilmiş lifli beton (SIFCON), inşaat mühendisliği alanında çok popüler malzemelerden biri olmuştur. Yüksek dayanımlı betonlardan en önemli farkı kırılma sırasında sünek davranış göstermesidir. Bu çalışmada SIFCON'un rijit kaplama olarak kullanımı araştırılmıştır. Deneyler, L16 ortogonal dizi tekniği kullanılarak her biri dört seviyeli dört faktör ile tasarlanmıştır. Faktörler ve seviyeleri 40, 55, 65, 80 lif görünüm oranı, %3, %6, %9, %12 lif hacmi, 0,30, 0,35, 0,40, 0,45 su/çimento oranı ve %0, %5, %10, %15 silis dumanı oranıdır. Deney sonuçları Taguchi yöntemi ile varyans analizi (ANOVA) tekniği kullanılarak değerlendirilmiştir. ANOVA'ya göre, beton kaplamaların basınç ve eğilme mukavemetinde en önemli rolü lif görünüm oranı (L/d) oynamıştır. Ayrıca basınç mukavemeti için optimum koşullar 55 (L/d), %3 lif oranı, 0.45 su / bağlayıcı oranı ve %5 SD oranı, eğilme mukavemeti için 80 L/d, %12 lif oranı, 0.45 su / bağlayıcı oranı ve %5 SD oranı olarak bulunmuştur. Optimum koşullarda 145.72 MPa ve 31.58 MPa'lık maksimum basınç ve eğilme dayanımı elde edilmiştir.
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ArticleAçık Erişim2019/r/ebyu/18100
The Application of Multi-Phase Power Distribution Line with Pure Energy Conversion
Can, Erol
This paper discusses the power transmission of a six-phase power line with a six-phase LPWM inverter. The 20 km long line with six-phase is formed to be fed from the 6-phase multi-level inverter. The structure of the line and the elements of the power line are given in the design phase. After that, mathematical analysis of the power line is done to present information on the line structure and the relationship between the variables of the line. In the application stage, the described line is operating in Matlab Simulink. The input voltage of the line, the voltage of the RC parallel filter on the line and the voltage of the 1MW load on the line are measured. Six phase flux of the power is measured according to b2 and b4 bus points. Harmonic distortion of created voltages is measured. The harmonic distortion of the voltage on the Z(2) impedance is 0.12%. This level of deterioration is well below the international standard of 5% and is an ideal result for loads that need a pure multi-phase magnetic field. 6-phase voltage is measured at 244V amplitude on a 6-phase load with 1 MVA power connecting the secondary side of the transformer. Then, the distortion of this voltage is close to zero. This result is highly desirable for a load on the power line. Based on the results obtained, the power is transmitted over a 20 km long line with high quality successfully.
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ArticleAçık Erişim2019/r/ebyu/17890
POWER REGULATION BY COUPLE HALF WAVE LPWM RECTIFIER AT THREE-PHASE LOADS
Can, Erol
The paper presents an application of power control by couple half wave LPWM rectifiers processing at the energy distribution line. The switching method with the components of semiconductor for alternating energy control in the energy distribution line is used on alternating energy sources. In three-phase power line and load, power control and regulation are done with the proposed modulation correction index (MCI). Therefore, the simulation model of 3-phase energy distribution is established after the relationships between the energy sources and the circuit elements are determined by the circuit analysis method. The controls of the current and the voltage are done by trying at the different loads in the line at the simulation. According to the modulation correction index (MCI), currents of unbalanced loads are balanced by the proposed method on the power line. Then, the balance currents and powers that MCI provides are calculated. Finally, a power line of 15 km at length that is created by connecting the model of RLC is tested. Obtained results show the effectiveness of the proposed method.
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ArticleAçık Erişim2019/r/ebyu/17883
The Load Performance of Multi-Level Alternating Voltage Provided by Upgrade Effect
Can, Erol
In this paper, the applications of the multi-level inverter with a partial inductor are investigated on different loads. The operation of the inverter is given according to different conditions of the circuit at the six-part duty times. Mathematical equations for the inverter are forming according to the load which is resistive (R), inductive (L), and Capacitive (C) in serial connection. After describing the circuit structure, Matlab SIMULINK also simulates the circuit for loads that are RLC, and a single-phase asynchronous motor. While the voltage and current measurements for the RLC load are performed; measurements of the main winding current, auxiliary winding current, electromagnetic torque, speed are made on the asynchronous motor. RLC loads are operated at high current values such as 297A in order to examine the suitability of the proposed system for systems that may require high current. When the current harmonic distortions of RLC loads are observed, the distortion values are acceptable values that are lower than % 5 that is international standards of the IEEE. In another hand, despite the voltage is insufficient for supplying the motor at the motor application, the voltage is upgraded with the boost effect of the inverter. So, the voltage is both a multilevel and sufficient. According to the obtained results, it is shown that multi-level inverter design has been successfully performed by using partial inductor source.
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ArticleAçık Erişim2019/r/ebyu/15743
Investigation of wind energy potential of different provinces found in Turkey and establishment of predictive model using support vector machine regression with the obtained results; [Türkiye’de bulunan farklı illerin rüzgâr enerjisi potansiyelinin incelenmesi ve sonuçların destek vektör makinesi regresyon ile tahminsel modelinin oluşturulması]
Daş, Mehmet; Balpetek, Nilay; Akpınar, Ebru Kavak; Akpınar, Sinan
In this study, wind energy potential of Sinop and Adıyaman provinces in different regions of Turkey were analyzed statistically, based on the hourly measured data by Directorate of State Meteorological Station in 2008-2017 years. During the statistical analysis, average wind speed, standard deviation of wind speed, maximum wind speed and wind power density were determined. The Weibull distribution function was used to the distribution of wind speed and determination of wind power intensity. For the power density values obtained as a result of the study, a predictive model was established with the support vector machine (SVM) regression. Polynomial kernel, normalized polynomial kernel, radial basis function (RBF) kernel and Pearson universal kernel VII (PUK) models were used in SVM regression. Mean absolute error (MAE), root mean square error (RMSE), relative absolute error (RAE), and root relative square error (RRSE) error analyzes were performed for SVM regression estimates. The best estimation of wind power density predictive models generated by 4 different kernel functions using SVM regression was shown to belong to the polynomial kernel.
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Conference ObjectYalnız künye2019/r/ebyu/15741
A Path Loss Analysis on LTE Radio in Eastern Market Districts
Çabuk, Umut Can; Dalkiliç, Gökhan
Radio propagation and path loss attenuation are subject to many research - even for LTE - throughout decades already. Nevertheless, smart city and Internet of Things concepts are emerging recently. Hence, new path loss studies are required to address new problems that come up with these. This study introduces eastern market districts, located in the heart of some big cities, as distinct areas with special needs. So, many widespread propagation models are analyzed and evaluated considering environmental properties. Consequently, the COST231 Walfisch-Ikegami model is found to be the best fit for the defined area type; hence, the need for the empirical measurements are eliminated. Finally, simulations and calculations are made using the model, in order to make inferences about the coverage, the capacity and the quality of an LTE network to serve smart city services to the area.
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ArticleAçık Erişim2019/r/ebyu/15439
Mathematical algorithm of fuzzy logic controller for multilevel inverter creating vertical divided voltage
Can, Erol
A 9-level inverter with a boost converter has been controlled with a fuzzy logic controller and a PID controller for regulating output voltage applications on resistive (R) and inductive (L), capacitance (C). The mathematical model of this system is created according to the fuzzy logic controlling new high multilevel inverter with a boost converter. The DC-DC boost converter and the multi-level inverter are designed and explained, when creating a mathematical model after a linear pulse width modulation (LPWM), it is preferred to operate the boost multi-level inverter. The fuzzy logic control and the PID control are used to manage the LPWM that allows the switches to operate. The fuzzy logic algorithm is presented by giving necessary mathematical equations that have second-degree differential equations for the fuzzy logic controller. After that, the fuzzy logic controller is set up in the 9-level inverter. The proposed model runs on different membership positions of the triangles at the fuzzy logic controller after testing the PID controller. After the output voltage of the converter, the output voltage of the inverter and the output current of the inverter are observed at the MATLAB SIMULINK, the obtained results are analysed and compared. The results show the demanded performance of the inverter and approve the contribution of the fuzzy logic control on multi-level inverter circuits.
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ArticleYalnız künye2019/r/ebyu/15205
Performance assessment of solar-powered high pressure proton exchange membrane electrolyzer: A case study for Erzincan
Ganjehsarabi, Hadi
In this study, a performance assessment of a solar-powered high-pressure proton exchange membrane (PEM) electrolyzer for hydrogen production is conducted. The feasibility analysis of photovoltaic systems equipped with a high pressure PEM electrolyzer is presented for a university campus-scale community in Erzincan- Turkey. Variable solar irradiance data sets are utilized to assess the performance of the proposed system. A parametric study is conducted in order to evaluate the influence of some design parameters as well as operating conditions on the efficiency of the system. Efficiency of the overall system in the case of relevant inverter sizing is in the range of 11–12%. An ascent of the number of stacks leads to an increase in production rate which is almost linear by photovoltaic (PV) array size. The results shows that in order to have a higher efficiency, the inverter size should be higher than 0.75% of maximum excess power. The proposed system investigated in this study shows great promise of opening up opportunity to develop the high pressure PEM electrolyzer.
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