Yazar "Çiftçi, Koray" için listeleme
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Analysis of synchronization behavior of small world networks by kuramoto model
Çiftçi, Koray (Institute of Electrical and Electronics Engineers Inc., 2019)In this study, the synchronization behaviour of coupled oscillators with heterogeneous intrinsic frequencies is investigated with the Kuramoto Model. The network structure is varied between the completely regular and ... -
Developing a computer program of laser aplication imaged with fundus fluorescein angiography test for retinal diseases
Altun, C.; Uzundemir, F.; Çiftçi, Koray; Rasier, Rıfat (Gazi Eye Foundation, 2016)Purpose: The aim was to design a model which facilitates laser treatment for Diabetic Retinopathy and the treatment technique was conducted during education of assistant doctors. Materials and Methods: 127 patients diagnosed ... -
Investigation of the default mode network of the brain during Alzheimer's disease by minimum spanning tree
Çiftçi, Koray (2011)This study analyzes the connectivity pattern of the default mode network (DMN) in patients with Alzheimer's disease (AD) in comparison with young and elderly controls using the minimum spanning tree (MST). The findings ... -
Minimum Spanning Tree Reflects the Alterations of the Default Mode Network During Alzheimer's Disease
Çiftçi, Koray (Springer, 2011)This study analyzes the connectivity pattern of the default mode network (DMN) in patients with Alzheimer's disease (AD) in comparison with young and elderly controls using the minimum spanning tree (MST). This tree is a ... -
Modeling Cortical States By Spiking Neurons
Şengör, N. Serap; Kuyumcu, Yusuf; Çiftçi, Koray (IEEE, 2014)Computational neuroscience has been effective in providing tools for investigation of cognitive processes along with neurode generative diseases and neurological disorders, recently. In this work, it will be shown that it ... -
On Temporal Connectivity of PFC Via Gauss-Markov Modeling of fNIRS Signals
Aydore, Sergul; Mihcak, M. Kivanc; Çiftçi, Koray; Akın, Ata (IEEE-Inst Electrical Electronics Engineers Inc, 2010)Functional near-infrared spectroscopy (fNIRS) is an optical imaging method, which monitors the brain activation by measuring the successive changes in the concentration of oxy- and deoxyhemoglobin in real time. In this ... -
Retina Hastalıklarında Fundus Floresein Anjiografi Testi Üzerinden Lazer Uygulamasını Destekleyen Bilgisayar Programının Geliştirilmesi
Amaç: Diabetik Retinopati olgulu gözlerde laser tedavi tekniğini kolaylaştıracak, asistan doktor eğitimleri sırasında tedavi tekniğinin anlatılmasına yardımcı olacak şekilde bir model tasarlanması amaçlandı.Gereç ve Yöntem: ... -
Synaptic noise facilitates the emergence of self-organized criticality in the Caenorhabditis elegans neuronal network
Çiftçi, Koray (Taylor and Francis Ltd, 2018)Avalanches with power-law distributed size parameters have been observed in neuronal networks. This observation might be a manifestation of self-organized criticality (SOC). Yet, the physiological mechanisms of this behaviour ... -
Synchronization Cost of Coupled Oscillators with a Spatial Embedding
Çiftçi, Koray (Institute of Electrical and Electronics Engineers Inc., 2019)Synchronous behavior brings advantages for complex systems. Yet, this advantage comes with a cost: Emergence and sustainability of synchronization requires a continuous exchange among the interacting units. Thus, networks ... -
Visual stimulus placement comparison for Turkish P300 speller
Örken, Süleyman; Çiftçi, Koray (2012)A P300 speller is designed, that is implemented with Turkish characters. The designed P300 speller is used as a brain computer interface via electroencephalogram (EEG). For this speller, the visual stimulus has been prepared ...