Araştırma Çıktıları / Scopus
Recent Submissions
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Flexible LED Index Modulation for MIMO Optical Wireless Communications
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Publisher and Date:(Institute of Electrical and Electronics Engineers Inc., 2020)The limited bandwidth of optical wireless communication (OWC) front-end devices motivates the use of multipleinput- multiple-output (MIMO) techniques to enhance data rates. It is known that very high multiplexing gains can be achieved by spatial multiplexing (SMX) at the cost of prohibitive detection complexity. Alternatively, in spatial modulation (SM), a single light emitting diode (LED) is activated per time instance where information is carried by both the signal and the LED index. Since only ...
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Scheduling and Relay Selection for Full-Duplex Wireless Powered Cooperative Communication Networks
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Publisher and Date:(Institute of Electrical and Electronics Engineers Inc., 2020)In this manuscript, we consider a full-duplex wireless powered cooperative communication system where the users communicate with a hybrid access point through relays. We formulate an optimization problem with the objective to minimize the total transmission time through user scheduling and relay selection while considering the traffic demand, energy causality and initial battery levels of the users. The formulated optimization problem is a mixed integer non-linear programming problem, hence difficult ...
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On list k-coloring convex bipartite graphs
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Publisher and Date:(Springer Nature, 2021)List k-Coloring (Lik-Col) is the decision problem asking if a given graph admits a proper coloring compatible with a given list assignment to its vertices with colors in {1, 2, …, k}. The problem is known to be NP-hard even for k = 3 within the class of 3-regular planar bipartite graphs and for k = 4 within the class of chordal bipartite graphs. In 2015 Huang, Johnson and Paulusma asked for the complexity of Li 3-Col in the class of chordal bipartite graphs. In this paper, we give a partial answer ...
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Optical Index-Coded Space Shift Keying (IC/SSK)
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Publisher and Date:(Institute of Electrical and Electronics Engineers Inc, 2021)In this letter, a new channel coding technique is proposed for optical spatial shift keying (SSK)-based visible light communications (VLC) systems by introducing redundancy in the spatial domain. The information is encoded by the redundant indices of the light emitting diodes (LEDs), assuming full channel state information (CSI) at the transmitter. The efficient construction of index-coding (IC) is presented with low computational complexity. Depending on the number of LEDs and the PDs as well as ...
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Understanding language acquisition: Neural theory of language
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Publisher and Date:(Selcuk University, 2021)This paper aims to discuss old and contemporary perspectives in understanding language acquisition taking into account the neural theory of language. Discussing a recent theory by Kuhl (2010), neural substrates of first language learning will be put forward (Berwick et al., 2013). Neural substrates of phonetic learning, word learning, sentence processing, and syntax development are separately discussed. As a novel window to look into language learning in a greater detail, second language learning ...
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Facial attractiveness and preference of sexual dimorphism: A comparison across five populations
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Publisher and Date:(Cambridge University Press, 2021)Despite intensive research, evolutionary psychology has not yet reached a consensus regarding the association between sexual dimorphism and attractiveness. This study examines associations between perceived and morphological facial sexual dimorphism and perceived attractiveness in samples from five distant countries (Cameroon, Colombia, Czechia, Iran, and Turkey). We also examined possible moderating effects of skin lightness, averageness, age, body mass, and facial width. Our results suggest that ...
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Energy-Efficient Resources Allocation with Millimeter-Wave Massive MIMO in Ultra Dense HetNets by SWIPT and CoMP
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Publisher and Date:(Institute of Electrical and Electronics Engineers Inc., 2021)Ultra-dense HetNets (UDN)-based Millimeter-Wave (mmWave) massive MIMO is considered a promising technology for 5th generation (5G) wireless communications systems since it can offer massively available bandwidth and improve energy efficiency (EE) substantially. However, in UDN, the power consumption of the system increases sharply with the increase of network density. In this paper, we investigate the optimization of the EE in the mmWave massive MIMO systems with UDN. To develop the functions of ...
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Solution of Lossless Broadband Matching Problems via Insertion Loss Method
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Publisher and Date:(Institute of Electrical and Electronics Engineers Inc., 2021)In this work, lossless broadband matching problem with complex generator and load impedances is solved via insertion loss method that is used to design filters with purely resistive generator and load impedances. In the proposed approach, firstly the power delivered to load impedance before inserting the matching network is calculated. Then the desired power delivered to the load impedance after inserting the matching network is defined. Based on these power values, desired power loss ratio is ...
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Ethnic identity and economic welfare
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Publisher and Date:(Elsevier B.V., 2021)In this study, we use rich survey data to understand the determinants of labor market success across refugees of different ethnicities in Turkey. In particular, we examine individual personality traits and integration barriers by considering metrics of refugees’ proximity to Turkey based on their home countries’ levels of cultural distance. Using microdata, we derive a refined index called ethnosizer scale to grasp the distance of minor ethnic identities in Istanbul to the dominant identity. ...
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Evaluation of tanker vehicle selection using a novel hybrid fuzzy MCDM technique
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Publisher and Date:(Regional Association for Security and crisis management, 2021)Petroleum products transportation considered as one of the crucial parts of dangerous material transportation is a risky logistics activity. The selection of the appropriate tanker vehicles may be a suitable solution to reduce the risks and increase the efficiency and performance of the fuel transportation companies. However, the selection of a suitable road tanker vehicle is not an easy task for decision-makers as there are many conflicting criteria and many decision alternatives. In addition, ...
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Maternal behaviors mediate the relationship between socioeconomic status and joint attention
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Publisher and Date:(Elsevier Ltd, 2021)Socioeconomic status (SES) is strongly related to parental behaviors and the quality of parent-child interactions. We examined whether through maternal behaviors, SES is linked to joint attention (JA), an important form of parent-child interactions predicting language development. At 12 months, 50 mother-infant dyads were video-recorded during 5-min free play. We coded for maternal behaviors (sensitivity, cognitive stimulation, positive affect, negative affect, control) and JA characteristics ...
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How organizational and geographic complexity influence performance: Evidence from European banks
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Publisher and Date:(Elsevier B.V., 2021)We empirically investigate how bank internationalization, organizational complexity, and geographical complexity stemming from foreign-affiliate type and geographic dispersion affect parent bank stability and profitability. We base our analysis on unique, hand-collected data for the worldwide locations of subsidiaries and branches of EU banks. Our results show that internationalization benefits bank stability by reducing default risk, and it is significantly associated with lower earnings volatility ...
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Inferring political and religious attitudes from composite faces perceived to be related to the dark triad personality traits
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Publisher and Date:(Elsevier Ltd, 2021)We used composite face images perceived to have different levels of Dark Triad personality traits (narcissism, psychopathy, and Machiavellianism) and asked participants to predict these target individuals' religious and political identities. In Study 1 (N = 550), Turkish participants rated faces with higher levels of perceived Dark Triad traits as less likely to be religious, to believe in God, and more likely to be left-winger, and to vote for a left-leaning party in all categories except for ...
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China’s energy-supply security in the multi-energy transition period from fossil fuels to renewable energy
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Publisher and Date:(World Scientific Publishing Co., 2020)The rise of China as an economic superpower after the 2008 global financial crisis has attracted increasing worldwide attention. Securing access to ample and affordable energy supplies - energy-supply security - has underpinned its rise and will continue to contribute to its economic prosperity. This chapter examines China’s energy-security challenge with respect to its policies. The global energy system is currently undergoing a multi-energy transition away from fossil fuels: the powers will take ...
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Humanoid service robots: The future of healthcare?
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Publisher and Date:(SAGE Publications Inc., 2021)Humanoid service robots made swift progress in extending a helping hand to the strained global healthcare during the COVID-19 pandemic. This case provides an overview of the robots’ inclusion in healthcare regarding pre- and intra-pandemic contexts. Specific focus is devoted to humanoid service robots as their shape, size, and mobility make them advantageous in using the physical spaces designed for humans. A collection of examples from hospitals worldwide is presented in illustrating the humanoid ...
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Application of deep neural network (DNN) for experimental liquid-liquid equilibrium data of water + butyric acid + 5-methyl-2-hexanone ternary systems
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Publisher and Date:(Elsevier B.V., 2021)LLE data are important for simulation and design of extraction equipment. In this study, deep neural network (DNN) structure was proposed for modelling of the ternary liquid-liquid equilibrium (LLE). LLE data of (water + butyric acid + 5-methyl-2-hexanone) ternaries defined at three different temperatures of 298.2, 308.2, and 318.2 K and P = 101.3 kPa, were obtained experimentally and then correlated with nonrandom two-liquid (NRTL) and universal quasi-chemical (UNIQUAC) models. The performance ...
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Science and flags: deconstructing Turkey's Antarctic strategy
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Publisher and Date:(ROUTLEDGE JOURNALS, 2021)This article explores Turkey's recent increased interest in the Antarctic by deconstructing how this interest contributes to the making of Antarctic nationalism(s). It makes two arguments. First, Turkey's status-seeking by being present in the Antarctic contributes to Antarctic nationalism(s) by invoking three distinct yet overlapping strands of nationalisms - banal, pragmatic-techno and Kemalist nationalisms, or what we term assemblage nationalism. Second, we argue that it was this nationalist ...
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Effects of second-language acquisition on character introductions in 5-and 7-year-old bilingual and monolingual children's Frog story narratives
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Publisher and Date:(SAGE PUBLICATIONS LTD, 2021)This study investigates the effects of early second-language (L2) acquisition on introduction of characters in narrative discourse by comparing 5- and 7-year-old monolingual (first-language [L1] = Turkish) and bilingual (L1 = Turkish, L2 = English) children. Turkish does not have a grammaticalized article system like English which enables to investigate specific influences. The findings revealed that monolingual and bilingual children used similar forms while introducing characters; however, for ...
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Understanding users' behavioral intention to use voice assistants on smartphones through the integrated model of user satisfaction and technology acceptance: a survey approach
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Publisher and Date:(EMERALD GROUP PUBLISHING LTD, 2021)Purpose This study aims to determine system quality (SQ) and information quality (IQ) characteristics of voice assistants (VA) on smartphones that are affecting users' satisfaction and technology acceptance, and how these affect behavioral intention (BI) to use. Design/methodology/approach This study uses the integrated model of user satisfaction and technology acceptance to evaluate users' behavioral intention to use VAs on smartphones. The model represents a causal chain from the key characteristics ...
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Machine type communications: key drivers and enablers towards the 6G era
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Publisher and Date:(SPRINGER, 2021)The recently introduced 5G New Radio is the first wireless standard natively designed to support critical and massive machine type communications (MTC). However, it is already becoming evident that some of the more demanding requirements for MTC cannot be fully supported by 5G networks. Alongside, emerging use cases and applications towards 2030 will give rise to new and more stringent requirements on wireless connectivity in general and MTC in particular. Next generation wireless networks, namely ...
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