Scopus İndeksli Yayınlar Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12469/1248

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Citation - Scopus: 5
Ir Theoretical Approach To the Paris Climate Agreement: Neo-Neo Debate, Eco-Marxism and Green Capitalism;
(Forsnet, 2017) Ünver,H.A.
Continued inability of the international climate negotiations to reach a common resolution has been subject to academic and scientific research focus. These studies have focused on the ways of fostering cooperation and preventing free-riding in climate negotiations, through the development of balancing methods. This article first attempts to explore why climate negotiations since 1997 Kyoto Protocol have failed and how such failures could be overcome in 2015 Paris UN Climate Conference through a neorealist and neoliberal institutionalist context. Especially, neorealist concepts such as systemic anarchy, self-helf and relative gains, along with the neoliberal institutionalist response to them through complex interdependence and abolute gains, have been instrumental to crafting a theoretical answer to the success of most recent climate negotiations. The article then adds two new systemic-theoretical approach to the debate, namely Eco-Marxism and Green Capitalism, and aims to contextualize these approaches within international relations theoretical literature. © 2017, Forsnet. All rights reserved.
Generation and Analysis of Strong Motion Signals via Diffusion Model
(IEEE, 2025) Dogrusoz, Rem; Yilmaz, Baris; Tileylioglu, Salih; Akagunduz, Erdem
This study examines the potential of Denoising Diffusion Probabilistic Models in earthquake engineering to generate seismic signals and learn deep representations. The complex nature of seismic data and its noise are major obstacles that hinder the extraction of meaningful features. Traditional supervised learning methods are limited in their generalization capacity due to their dependence on labeled data. Diffusion models, however, promise to overcome these limitations by generating conditional seismic signals and enhancing the reliability of early warning systems. This study aims to demonstrate how diffusion-based methods contribute to earthquake engineering and propose an approach for seismic data analysis and detection of the P-wave arrival time. The obtained results show that the model can grasp certain patterns; however, larger-scale datasets are needed for more realistic signal generation and a deeper understanding of seismic features.
Citation - Scopus: 1
Time, Space And Closure İn Karamanlidika Temaşa-i Dünya ve Cefakâr U Cefakeş: Rewriting Polipathis;
(Ahmet Yesevi University, 2018) Şimşek,Ş.Ş.
This article criticises the argument that then arrative fiction called Temaşa-i Dünya ve Cefakâr u Cefakeş (1871-1872) by Evangelinos Misailidis (1820-1890), an Ottoman Christian-Orthodox citizen, is just a mere imitation of the Greek novel O Polipathis (1839). Using mainly Gérard Genette’s the oretical framework and narratological concepts, it can be said that Misailidis has significantly transformed Polipa this semantically especially in terms of time, space and closure in then arrative. Hence, this study also focuses on the problem of there writing of a text using varied writing strategies. Finally, this article claims that, as it contains various writing strategies as well as newnarrativepossibilities, Temaşa-i Dünya is an original novel that reveals the multilingual Ottoman world and Ottoman literature in then ineteenth century. © 2018, Ahmet Yesevi University. All rights reserved.
Citation - Scopus: 7
The Effects of Phase Ii Cardiac Rehabilitation Programme on Patients Undergone Coronary Bypass Surgery
(2005) Çiftçi, C.; Duman, B.S.; Çağatay, P.; Demiroğlu, C.; Aytekin, V.
Objective: To investigate the effects of phase II cardiac rehabilitation in 52 patients undergone coronary artery bypass surgery. Methods: Gradual walking tests, cardio-pulmonary capacity tests and lipid profile were administered to patients selected for phase II cardiac rehabilitation before and after the programme. Training was started on 12-channel electrocardiogram controlled running bands 3 times a week for 20 min periods for 12 weeks fitting the programme. Low or intermediate level exercise programme was applied to patients. Cleveland Clinic Chronotropic Assessment exercise protocol was used during rehabilitation. Results: As a result of phase II cardiac rehabilitation administered to 52 patients undergone coronary bypass operation, exercise capacity, oxygen consumption, anaerobic threshold, cardiac output mean values (p?0.001) and mean HDL cholesterol level (p?0.05) were found to increase, whereas body mass index, total cholesterol, LDL cholesterol and triglyceride mean levels reduced (p?0.001) significantly. Conclusion: In patients who have undergone coronary bypass surgery, phase II cardiac rehabilitation is a very useful programme in improvement of life quality and secondary prevention.
Programmed cell death in heart failure: Review [Programlı hücre ölümünün kalp yetersizli?indeki yeri]
(2005) Süsleyici Duman, Belgin; Türkoğlu, Çavlan; Öztürk, Melek
The molecular and biochemical mechanisms of programmed cell death also known as apoptosis have not yet to be fully elucidated. Apoptosis is characterized by active intracellular communication loss of cellular attachment cell shrinkage DNA fragmentation and phagocytosis. Recently accumulated evidence indicates that apoptosis is involved in both physiological and pathophysiological processes of heart failure. Many factors have been identified that induce cardiomyocyte apoptosis during heart failure. However many questions remain to be answered regarding the pathophysiological triggers of apoptosis and their mechanisms. As such due to the incipient state of research regarding the question as to whether apoptotic inhibition delays or prevents heart failure it appears advanced molecular and pharmaco-genomic studies will be essential in identifying potential targets in prospective therapies for the prevention of apoptosis. Copyright © 2005 by Türkiye Klinikleri.
Citation - Scopus: 2
A Numerical Method for Frequency Determination in the Astable Cellular Neural Networks With Opposite-Sign Templates
(2006) Özmen, A.; Tander, B.
In this study, a numerical method is proposed to determine the oscillation frequencies in the astable cellular neural networks with opposite-sign templates [1]. This method depends on the training of a multilayer perceptron that uses various template coefficients and the correspondant frequency values as inputs and outputs. First of all, a frequency surface is obtained from templates and then, training samples are picked from this surface in order to apply to multilayer perceptron. The effects of the template coefficients to the oscillation frequencies are also investigated. Furthermore, an oscillator design is carried out for simulation and the performance as well as the advantages of the proposed method are evaluated. © 2006 IEEE.
Citation - Scopus: 5
The education of international relations in turkey and orientalism: A critical pedagogical approach to the discipline
(International Relations Council of Turkey, 2019) Ongur, H.Ö.; Gürbüz, S.E.
Using a qualitative discourse analysis, this article aims at introducing the sub-discipline of Critical Pedagogy (CP) to the studies of International Relations (IR), incorporating the orientalist text analysis into CP and arguing over the orientalist texture of the undergraduate education of IR in Turkey. It is argued here that due to the Western-centrism of CP studies, they ‘forget’ to bring into question the orientalist tone of the standardized Western curricula, next to the main discussions of academic capitalism and neoliberal instrumentalization of education. Making an investigation of the curricula and the fundamental reading materials over ten selected IR programmes in Turkey, this article both recalls this need of orientalist inquiry in CP studies and provides a fresh perspective for the scholarly analysis of the IR education in Turkey. The findings suggest a non-critical reproduction of the Western literature for the Turkish IR as well as a continuation, if not reinforcement, of this literature by the Turkish-speaking academia. As a result, it is argued here that the orientalist subtext of concepts, including radical Islam, Jihadism, fundamentalism, Islamic terror, the Third World, underdevelopment, etc., has become a part of the IR literature in Turkey. © 2019, International Relations Council of Turkey. All rights reserved.
Citation - Scopus: 5
Türkiye’de Güvenlik: Algı, Politika, Yapı
(International Relations Council of Turkey, 2014) Aydin, M.; Ereker, F.
The aim of this study is to analyze the foundations, evolution and implementation of the security and strategy culture of Turkey, as a country whose society has been constructed through a particular security identification. In this context, the initial aim is to analyze the historical and geopolitical background of Turkey’s security perceptions. Afterwards, the security con-ceptualization of Turkey and the role played by the military in this process will be analyzed together with the effects of the systemic transformation experienced after the Cold War. The institutional security structure and its impact on the security conceptualization of the Turk-ish academia will also be examined. Finally, the new security understanding which has been developed after the Cold War will be analyzed in relation with the security policies that have implemented. © 2014, International Relations Council of Turkey. All rights reserved.
Citation - Scopus: 3
Channel Estimation for Dco-Ofdm Based Vlc Systems in the Presence of Clipping Noise
(Institute of Electrical and Electronics Engineers Inc., 2020) Bektas, E.B.; Panayırcı, Erdal
Visible Light Communication(VLC) has been considered as a potential access option for 6G wireless systems to solve performance limitation due to bandwidth shortage at radio frequency (RF) band. In VLC system, illumination infrastructure has dual usage at the same time namely illumination and wireless data transmission. DC-Biased optical DCO-OFDM with clipping has been proposed for VLC systems to provide optically power efficient solution and easy implementation. Wireless communication systems generally require estimating and tracking the fading channel in order to detect transmitted data coherently. In this work, we propose a pilot-aided iterative channel estimation algorithm to efficiently estimate the optical channel coefficients of a clipped DCOOFDM system operating with additive white Gaussian noise (AWGN). The estimation algorithm is capable of improving the channel estimation by making use of pilot symbols with interpolation or using the channel estimate of previous OFDM block to obtain the next estimate for the iterative algorithm. In each iteration, the clipping noise is estimated and compensated in the frequency domain. Simulation results verify that the proposed channel estimation algorithm reduces the bit error rate (BER) and mean-square error (MSE) of channel estimate can be significantly. © 2020 IEEE.
Citation - Scopus: 10
International Relations in Turkey: an Evaluation on the Findings of Trip 2018;
(International Relations Council of Turkey, 2019) Aydin,M.; Dızdaroğlu,C.
In parallel with the worldwide studies focusing on the International Relations (IR) discipline, there have been works looking into the transformation of the IR discipline in Turkey and its contribution to the global knowledge production. In order to provide sound data for these studies, International Relations Council of Turkey (IRCT) conducted two surveys among the Turkish IR academics in 2007 and 2009, and have been cooperating with the Institute for the Theory and Practice of International Relations at the College of William and Mary since then on the Teaching, Research and International Policy (TRIP) project. The TRIP surveys that aim to understand the epistemological and ontological limits, autonomous character of the IR discipline as well as the theoretical, metodological and pedagocial approaches in which IR scholars used in their teaching and research activities, also help to comprehend the place of the Turkish IR scholars within the global IR discipline. This paper presents Turkey-related findings of the lastest survey, which was simultaneously conducted in 35 different countries between February and July 2018. © 2019, International Relations Council of Turkey. All rights reserved.
Citation - Scopus: 1
Physical Layer Security Under the Effect of Dimming in Visible Light Communications;
(Institute of Electrical and Electronics Engineers Inc., 2023) Yeşilirmak,Y.E.; Işikver,Ç.; Gökhan,R.B.; Arsan,T.; Panayirci,E.
Visible Light Communication (VLC) is a promising option for 6G wireless systems to increase performance and provide a high-speed data rate compared to radio frequency (RF). Dimming control is one of the most important aspects to be considered in VLC. It is very critical for the future of VLC to adjust the brightness of the light source to be used in communication and to ensure that the light source, with a changing brightness, maintains the desired communication performance due to the situation and environment. This work proposes a novel pilot-aided estimation method for channel and dimming coefficients in spatial modulation (SM)-VLC systems. As a result, in the VLC system running with the PLS algorithm, while the information transmitted to the legal user is received with an excellent BER performance, it is observed that the BER performance of the eavesdropper is around 0.5, which is the worst possible situation for the illegal user. © 2023 IEEE.
Citation - WoS: 1
Time Space and Closure in Karamanlidika Temasa-I Dunya Ve Cefakar U Cefakes : Rewriting Polipathis
(Ahmet Yesevi University, 2018) Şişmanoğlu Şimşek, Şehnaz
This article criticises the argument that then arrative fiction called Temasa-i Dunya ve Cefakar u Cefakes (1871-1872) by Evangelinos Misailidis (1820-1890) an Ottoman Christian-Orthodox citizen is just a mere imitation of the Greek novel O Polipathis (1839). Using mainly Gerard Genette's the oretical framework and narratological concepts it can be said that Misailidis has significantly transformed Polipa this semantically especially in terms of time space and closure in then arrative. Hence this study also focuses on the problem of there writing of a text using varied writing strategies. Finally this article claims that as it contains various writing strategies as well as newnarrativepossibilities Dunya is an original novel that reveals the multilingual Ottoman world and Ottoman literature in then ineteenth century.
Citation - Scopus: 6
Coronary Bypass Surgery in Octogenarians
(2001) Arbatli, H.; Unal, M.; Demirsoy, E.; Tansal, S.; Yagan, N.; Tükenmez, F.; Sener, D.
OBJECTIVE: The age of the patients referred for coronary bypass surgery is getting older progressively. Early and late postoperative outcome of octogenarians were evaluated and compared with younger age group in this study. METHODS: Records of 55 patients aged 80 years or older (mean age 82.7 +/- 2.8) among 3834 patients, who had coronary bypass graft procedure, operated between 1995 and 2001 were reviewed retrospectively. RESULTS: There were 39 men (70.9%) and 16 women (29.1%). Three patients had aortic valve replacement, 1 had left ventricular aneurysm repair, 1 had carotid endarterectomy additionally. Atrial fibrillation (21.8%), renal dysfunction (16.4%), and prolonged ventilation (10.9%) were the prominent complications. The hospital mortality rate was 7.27% (4 patients). Kaplan Meier Survival Analysis estimated that at the end of 5 years 83.1 + 5.2% of patients were still alive. CONCLUSION: Coronary bypass operations can be performed in octogenarians with slightly increased but acceptable hospital mortality and longer hospital stay. Early intervention and individual modifications in cardiopulmonary bypass techniques may improve the results in this patient population.
Em-Based Joint Data Detection and Channel Estimation for Uplink Mc-Cdma Systems Over Frequency Selective Channels;
(2007) Doǧan,H.; Panayirci,E.; Çirpan,H.A.; Fleury,B.H.
This paper is concerned with joint channel estimation and data detection for uplink multicarrier code-division multipleaccess (MC-CDMA) systems in the presence of frequency fading channel. The detection and estimation algorithm, implemented at the receiver, is based on a version of the expectation maximization (EM) technique which is very suitable for the multicarrier signal formats. Application of the EM-based algorithm to the problem of iterative data detection and channel estimation leads to a receiver structure that also incorporates a partial interference cancelation. Computer simulations show that the proposed algorithm has excellent BER end estimation performance.
Citation - Scopus: 3
Modeling of Visible Light Channels and Performance Analysis of Aco-Ofdm
(Institute of Electrical and Electronics Engineers Inc., 2015) Yesilkaya, A.; Alsan, H.F.; Miramirkhani, F.; Panayırcı, Erdal; Senol, H.; Uysal, M.
Spectrum scarcity of traditional radio communication has led communication engineers to find new alternatives. Indoor visible light communication is one alternative to solve this problem since its spectrum is not regulated and it has much wider bandwidth then traditional communication systems. This increased the research done in the field of visible light communications. However a proper indoor channel model is lacking and all previous studies assumes that only additive white Gaussian noise (AWGN) is present. Lack of proper channel model has motivated us to model a realistic indoor visible light channel. After modeling the indoor visible light channel, the performance of an asymmetrically clipped optical OFDM (ACOOFDM) system which is suitable for optical communications is investigated and compared to that of the AWGN optical channels. © 2015 IEEE.
BERT for Harmonic Time Series Modeling: A Multi-Stage Fine-Tuning Approach
(IEEE, 2025) Hekimoglu, Nevin Sehbal; Tileylioglu, Salih; Akagunduz, Erdem
This study demonstrates the potential of a BERT-based transformer model in harmonic signal modeling using synthetic sinusoidal data. The model was trained through a three-stage fine-tuning process (reconstruction, linear analysis, full tuning) with a masked language modeling approach. In the first stage, the model successfully filled in missing data and learned the basic features, while in subsequent stages, its ability to capture temporal dependencies and sequential patterns was enhanced. Additionally, patch, time, and station embedding strategies effectively represented the harmonic structure of the signal. The results indicate that pre-training with synthetic data can overcome the limited access to real-world data, allowing transformer models to be efficiently used in these types of problems.
Effect of the Channel Estimation Error on the Performance of the Source Estimator in a Wireless Sensor Network With Orthogonal Channels;
(2008) Şenol,H.; Tepedelenlioǧlu,C.
In this work, effect of the channel estimation error on the MSE performance of the source estimator in a wireless sensor network with orthogonal flat fading channels is studied. A two-phase approach was employed where in the first phase, the orthogonal fading channel coefficients are estimated, and in the second phase, channel estimates and sensor observations transmitted to fusion center are used for the source estimation. We consider a sensor network in which the channel estimates are fed-back to the sensors for optimal power allocation which leads to switch off the sensors with bad channels in the second phase. We also show that training power should be at least half of the total power. Our analytical findings are corroborated by simulation results. ©2008 IEEE.
Citation - Scopus: 9
From the Atlantic Pact to NATO: Debating Turkey's location and function in the Turkish Grand National Assembly
(International Relations Council of Turkey, 2012) Yanik, L.K.
This article, using critical geopolitics as a framework, analyzes identity formation in Turkey during Turkey's NATO accession. The main thesis of this article is that identity that is made through foreign policy discourse should not only be confined to debates about location, culture and values but should also include a country's own perceptions about its international function. This article analyzes debates in the Turkish Grand National Assembly just before and after Turkey's NATO accession and it argues that though Turkish elites perceived itself as part of the West in terms of location, culture and values, this was not the case in terms of international function. By becoming the disseminator of the Western security understanding to the Middle East as part of the West, Turkey during these years has started to carve itself a liminal identity. This limnality, however, was a covert one because Turkey perceived itself as part of the West in terms of location, culture and values, but assumed an in-between role in terms of function in the international system.
Citation - Scopus: 1
Outage Probability of a Cooperative Maximum Ratio Transmission
(IEEE, 2014) Erdoğan, Eylem; Muşta, Mahmut Sami; Güçlüoğlu, Tansal
In this paper we present a cooperative communication system employing maximum ratio transmission technique and its outage probability performance over Rayleigh fading channels. Since maximum ratio transmission can achieve full diversity when used at tranmitters having multiple antennas while requiring no complexity increase at the receiver the proposed system can be a preferable structure to be used both at the source and amplify-forward type relays of wireless networks to provide high speed and reliable transmission in practice. For this system average end-to-end signal to noise ratio is analyzed mathematically moreover our computer simulation results show the error performance for several scenarios.
Training and Evaluation of a Variational Autoencoder for Seismic Station Data Analysis
(IEEE, 2025) Gurkan, Delfin Bengisu; Tileylioglu, Salih; Akagunduz, Erdem
In this study, a variational autoencoder model is proposed to encode the geological, geophysical, and geographical data of seismic stations in Turkey. The model encodes various station-specific data, such as site frequency, surface lithology, and latitude-longitude, into a low-dimensional latent space, aiming to disentangle the generative factors of these data and improve their representation. This approach effectively represents the regional characteristics surrounding the station, enabling the disentanglement of station-related effects. Evaluations based on disentanglement and completeness scores indicate that the model successfully distinguishes station characteristics, such as the average shear wave velocity in the top 30 meters of the surface. The resulting station data encoder can provide additional information to deep learning models processing acceleration records, contributing to a better understanding and modeling of station effects in seismic analysis.

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