Browsing by Author "2"
Now showing items 281-300 of 398
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On the broadcast capacity of wireless multihop interference networks
Atıcı, Çağdaş; Sunay, Mehmet Oğuz (IEEE, 2009)This paper is concerned with wireless broadcasting in multihop networks where a selected number of relay nodes may aid the source node in the broadcast under a given total energy and hop constraint. We study an ad-hoc ... -
On the feasibility of synchronous, retransmission-based cognitive networks
Ercan, Ali Özer; Sunay, Mehmet Oğuz (Elsevier, 2016-01)This paper presents a new, joint Markov chain model for the primary and secondary traffic in a cognitive radio network to assess the feasibility of opportunistic spectrum access for different operational scenarios, validated ... -
On the performance of NCC-OFDMA systems in the presence of carrier frequency offset
Heidarpour, Ali Reza; Kurt, G. K.; Uysal, Murat (IEEE, 2017)Network coded cooperative (NCC) systems have recently gained increasing attention due to their high power and spectral efficiency. For high speed data transmission over frequency-selective channels, NCC is further combined ... -
Online association rule mining over fast data
Ölmezoğulları, Erdi; Arı, İsmail (IEEE, 2013)To extract useful and actionable information in real-time, the information technology (IT) world is coping with big data problems today. In this paper, we present implementation details and performance results of ReCEPtor, ... -
Optical MIMO-OFDM with generalized LED index modulation
Yesilkaya, A.; Basar, E.; Miramirkhani, Farshad; Panayirci, E.; Uysal, Murat (IEEE, 2017-08)Visible light communications (VLC) is a promising and uncharted new technology for the next generation of wireless communication systems. This paper proposes a novel generalized light emitting diode (LED) index modulation ... -
Optical wireless communications – an emerging technology
Uysal, Murat; Nouri, Hatef (IEEE, 2014)Optical wireless communication (OWC) enables wireless connectivity using infrared, visible or ultraviolet bands. With its powerful features such as high bandwidth, low cost and operation in an unregulated spectrum, OWC can ... -
Optimal relay placement in cooperative free-space optical communication systems
Aminikashani, Mohammadreza; Safari, M.; Uysal, Murat (IEEE, 2012)Relay-assisted free-space optical (FSO) transmission exploits the fact that atmospheric turbulence fading variance is distance dependent and yields significant performance gains by taking advantage of the resulting shorter ... -
Optimal resource allocation and interference management for multi-user uplink light communication systems with angular diversity technology
Eldeeb, Hossıen Badr; Hosney, M.; Elsayed, H. M.; Badr, R. I.; Uysal, Murat; Selmy, H. A. I. (IEEE, 2020)Light communication (LC) technology has been regarded as a promising candidate for future indoor wireless networks by providing safe, power-efficient, and high data rate communications needed for tomorrow's applications. ... -
Optimization and analysis of WLAN RF energy harvesting system architecture
Munir, Syeda Wajiha; Amjad, Osama; Zeydan, E.; Ercan, Ali Özer (IEEE, 2016)This paper presents the design, analysis and optimization of RF energy harvesting system for WLAN source operating at 2.4 GHz and 5.8 GHz. The system architecture comprises of RF WLAN source, wireless channel, an efficient ... -
Optimization of the intermediate layer friction stir spot welding process
Bajilane, Isam Jabbar Ibrahim; Yapıcı, Güney Güven (Springer Nature, 2019-09)Friction stir spot welding was performed for joining sheets of 2024 and 6061 aluminum alloys, which is otherwise difficult using conventional welding techniques. The presented approach utilizes an intermediate layer to ... -
Optimized calibration of currency market strategies
We propose a new financial indicator and risk metric embedded in a currency trading model to assist investors in currency markets. Since our model is highly nonlinear, we utilize global optimization technology to maximize ... -
Outage analysis of hybrid FSO/RF systems based on finite-state Markov Chain modeling
Kazemi, Hossein; Uysal, Murat; Touati, F. (IEEE, 2014)In this paper, we analyze the outage probability of a hybrid free-space optical/radio-frequency (FSO/RF) communication system with soft-switching. In soft-switching approach, either one of the links or both links can be ... -
Outage capacity and throughput analysis of multiuser FSO systems
Zhalehpour, Sasan; Uysal, Murat; Dobre, O. A.; Ngatched, T. (IEEE, 2015)In this paper, we investigate the performance of free space optical (FSO) systems with a multiuser scheme employing select-max scheduling technique. Specifically, we consider an FSO communication system which employs a ... -
Outage performance analysis of mth best path selection protocol in FSO communications
Zhalehpour, Sasan; Uysal, Murat (IEEE, 2014)In this paper, we investigate the performance of free space optical (FSO) systems with parallel multihop relaying and path selection. Specifically, we consider an FSO communication system which employs M parallel relaying ... -
Outage performance and diversity gain analysis of free-space optical multi-hop parallel relaying
Aminikashani, Mohammadreza; Uysal, Murat (IEEE, 2013-08)In this paper, we investigate the outage performance of free-space optical mesh networks, which build upon the combination of serial (multi-hop) and parallel relaying. We assume log-normal atmospheric turbulence channels ... -
Outage performance of FSO multi-hop parallel relaying
Aminikashani, Mohammadreza; Uysal, Murat (IEEE, 2012)In this paper, we investigate the outage performance of relay-assisted free-space optical (FSO) networks which build upon the combinations of serial and parallel relaying. We assume log-normal atmospheric turbulence channels ... -
Outage performance of MIMO free-space optical systems in gamma-gamma fading channels
Kazemi, Hossein; Mostaani, Zohreh; Uysal, Murat; Ghassemlooy, Z. (IEEE, 2013)In this paper, we consider a MIMO Free-Space Optical (FSO) communication system over gamma-gamma turbulence channels and derive a closed-form analytical expression for the outage probability taking into account the effects ... -
ÖZÜ konuşmacı doğrulama sisteminin çok sınıflı senaryoda NIST 2010 veritabanı ile başarımı
Yeşil, Fatih; Demiroğlu, Cenk (IEEE, 2011)Performance of the speaker verification systems is typically measured based on their binary decision accuracy. However, in speaker verification applications where close to %100 accuracy is required, such as the systems ... -
Parametric studies on vibration characteristics of triply periodic minimum surface sandwich lattice structures
Şimşek, Uğur; Arslan, T.; Kavas, B.; Gayir, C. E.; Şendur, Polat (Springer Nature, 2020-10-07)Additive manufacturing has opened new avenues for the manufacturing of structures to achieve challenging engineering tasks. Gyroid, a unique example of such structures, exhibits many attractive properties, such as high ... -
Patterns of associations between maternal symptoms and child problem behaviors: the mediating role of mentalization, negative intentionality, and unsupportive emotion socialization
Arıkan, Gizem; Kumru, Asiye (Springer Nature, 2021-08)We examined how maternal depression, anxiety, hostility, mentalization, negative intentionality (NI), and unsupportive emotion socialization (UES) predict child internalizing and externalizing problem behaviors (CIEPB). ...
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