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Bulunan: 141 Adet 0.002 sn
WOS Kategorileri : SCI SCI Eaxp SSCI AH ... ✕
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Erişime Açık

Application of best relay selection approach to cooperative DF IDMA systems over Rayleigh/Weibull fading channels

Mehmet BİLİM

This paper analyzes the performance of cooperative decode‐and‐forward (DF)interleave‐division multiple‐access (IDMA) networks with best relay selectionover Rayleigh/Weibull fading environments. In the analysis, approximate out-age probability (OP) and bit error probability (BEP) expressions are derivedfor the considered system. Further, a 2‐hop DF IDMA system is also designedto compare with cooperative one. We propose OP and BEP expression for 2‐hop DF IDMA systems. Numerical results are obtained by changing the num-ber of relays and the value of fading parameter in the proposed expressions.Al ...Daha fazlası

Makale/Derleme 2018 Wiley 5 Görüntülenme
Erişime Açık

Modulation of the electronic transport properties of silicon nanotubesvia hydrogenation ratio

Serhan YAMAÇLI

In this work, electronic transport properties of hydrogenated silicon nanotubes (SiNTs) are studied using first-principles methods. Metallic (4, 4) and (7, 7) SiNTs are simulated using density functional theory combined with non-equilibrium Green's function formalism. The current–voltage characteristics of these nanotubes are obtained for various hydrogenation ratios considering that hydrogenation provides stability to SiNT structures as studied in the literature. The transmission spectra of the investigated SiNT structures are also given and discussed in order to analyse and extend the obtain ...Daha fazlası

Makale/Derleme 2016 Materials Research Express 10 Görüntülenme
Erişime Açık

Analysis of analytical capacity forFisher–SnedecorFfading channels withdifferent transmission schemes

Mehmet BİLİM

This Letter presents capacity analysis of Fisher–SnedecorFfadingchannels under different transmission strategies. To this end, novelanalytical expressions are proposed for optimal rate adaptation withconstant transmit power, channel inversion with afixed rate and trun-cated channel inversion withfixed rate schemes in this Letter. Then,analytical results are illustrated for different fading and shadowingparameter values.

Makale/Derleme 2019 IET 8 Görüntülenme
Erişime Açık

N-person grey game

Erkan KÖSE

Purpose – One important assumption in the conventional cooperative game theory is that payoffs are assumed to be deterministic. In terms of the players’ cognitive ability of the realistic world, this is a very strict assumption. The classical game theory can find no way out when a particular game circumstance involves uncertainty, such as limited knowledge, small sample, and inadequate information, the payoff values of the game can only be described with interval grey numbers. The paper aims to discuss these issues. Design/methodology/approach – In this study the concept of N-person grey games ...Daha fazlası

Makale/Derleme 2015 KYBERNETES 14 Görüntülenme
Erişime Açık

2 Stages-region-based p300 speller in brain-computer ınterface

Zeki ORALHAN

Brain–computer interface (BCI) applications present communication model without using peripheral nerves and neuromuscular systems. The P300 waves are used in BCI applications. Signal classification accuracy is a significant parameter for P300 BCI application. In this study, our goal is to investigate P300 speller structure for higher classification accuracy. There are a lot studies about P300 speller variations of stimulus model. This models mostly includes about row–column-based visual or audio stimuli model P300 spellers. But there is not enough study about region-based P300 spellers. This s ...Daha fazlası

Makale/Derleme 2019 IETE Journal of Research 5 Görüntülenme
Erişime Açık

Project staff scheduling with theory of coalition

Oğuzhan Ahmet ARIK | Erkan KÖSE

Project scheduling has been still one of the hottest topics in the management area. The goal of traditional project management is to complete the project at the earliest possible time in accordance with the available resources without violating priority relations of the activities involved. Unlike traditional project management, this study deals with the possibility of a coalition among the staf available to accomplish tasks of the project. The tasks can be fulflled by more than one staf members. Staf’s coalition shortens the completion time of the tasks. A natural problem that arises in this ...Daha fazlası

Makale/Derleme 2019 GROUP DECISION AND NEGOTIATION 12 Görüntülenme
Erişime Açık

Locating unmanned aircraft systems for multiple missions under different weather conditions

Erkan KÖSE

Motivated by the increasing civilian use of Unmanned Aerial Vehicles (UAVs), this paper considers the simultaneous location and routing of UAVs for multiple missions and diferent weather conditions. We include modeling and computational experience inspired by requirements for air surveillance by the Turkish government’s public agencies. We model these demands in multiple mission areas and consider the impact of diferent weather conditions on the ability to employ UAVs from diferent geographic locations. We formulate the problem as a two-stage stochastic integer linear program with recourse and ...Daha fazlası

Makale/Derleme 2019 Operational Research 5 Görüntülenme
Erişime Açık

Mixed integer programming approach for seasonal anomalies in stock markets: A case study for BIST

Oğuzhan Ahmet ARIK

This paper proposes a mixed integer programming approach for seasonal anomalies in stock markets and presents a case study for the XU030 index in the stock market of Istanbul Stock Exchange (BIST). Stock markets are significant for economies of countries all over the world. Investors get economical wealth or lose some of their investment by selling and buying stocks. Therefore, buying and selling times of stocks are so important. This paper investigates a well-known effect called as ‘Sell in May and Go Away’ by proposing a MIP approach that searches best times for buying and selling of stocks ...Daha fazlası

Makale/Derleme 2018 New Trends and Issues Proceedings on Humanities and Social Sciences 3 Görüntülenme
Erişime Açık

İki aşamalı tedarik zinciri koordinasyonunun bulanık talep altında analizi

Gülçin CANBULUT

Çalışmada; bir tedarikçi ve bir perakendeciden oluşan iki aşamalı bir tedarik zinciri yapısı talep değişkeninin bulanık parametre olması durumunda incelenmiştir. Tedarik zinciri üyelerinin her birinin farklı hedefleri bulunmakta ve kendi performanslarını optimum yapmayı istemektedirler. Bu sebeple tedarik zinciri üyeleri arasındaki koordinasyonun sağlanması gerekmektedir. Bu koordinasyona göre tedarik zincirleri; merkezi ve merkezkaç tedarik zincirleri olarak değerlendirilmektedir. Çalışmada merkezi ve merkezkaç tedarik zinciri modelleri için talep parametresinin bulanık değişken olması şartıy ...Daha fazlası

Makale/Derleme 2019 JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY 8 Görüntülenme
Erişime Açık

Effect of modelling parameters on non-linear seismic response of concrete structures

Ali Bozer

The non-linear numerical analysis of reinforced-concrete structures presents several difficulties due to the complicated behaviour of reinforced concrete under cyclic lateral loading. For practical use, design guidelines provide simplified non-linear models which are implemented in many structural analysis programs. However, restrictions and assumptions on which the models are based may influence the seismic response of existing structures. The primary aim of the work reported in this paper was to identify possible differences in structural response due to selected non-linear modelling paramet ...Daha fazlası

Makale/Derleme 2017 PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS-STRUCTURES AND BUILDINGS 9 Görüntülenme
Erişime Açık

Neural network model for seismic response of braced buildings

Ali BOZER

Non-ductile, concentrically braced frames are a common lateral force-resisting system used in low-to-moderate seismic regions in the USA. However, their dynamic responses to earthquake ground motions have not been well examined. Structural engineers usually design them conservatively as brittle structures with a small response-modification factor, while building codes restrict their use to low-rise buildings. In this paper, seismic responses of two typical non-ductile concentrically braced frames, one of three storeys and one of nine storeys, were predicted through a neural network model. Twel ...Daha fazlası

Makale/Derleme 2017 PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS-STRUCTURES AND BUILDINGS 6 Görüntülenme
Erişime Açık

Performance Evaluation of a Two-stage Supply Chain Under Fuzzy Environment

Gülçin CANBULUT

In this paper, performance evaluation of a two-stage supply chain which consists of a supplier and a retailer under uncertainty environment is examined. In the literature; many studies have been investigated on supply chain performance analysis in uncertainty environment and demand parameter is an essential data on these analyses. When there is sufficient data about demand, it is easy to construct probability distribution of demand. However, in the absence of enough historical data, it is impossible to construct the probability distribution. The demand parameter is intuitively determined and s ...Daha fazlası

Makale/Derleme 2018 JOURNAL OF MULTIPLE-VALUED LOGIC AND SOFT COMPUTING   6 Görüntülenme
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