Browsing by Author "Akın, Ata."

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  • Non-invasive monitoring of gastric motility in humans 
    Özcan, Koray. (Thesis (M.S)-Bogazici University.Institute of Biomedical Engineering, 2005., 2005.)
    Stomach is an organ of gastrointestinal system where the food coming from the mouth through the esophagus is mixed by the rhythmic contractions of the smooth muscles, with acid and other gastric secretions. The control of ...
  • Nonlinear state and parameter estimation of the hemodynamic model using fMRI bold signal 
    Aslan, Serdar. (Thesis (Ph.D.)-Bogazici University. Institute of Biomedical Engineering, 2015., 2015.)
    The joint estimation of the parameters and the states of the hemodynamic model from the blood oxygen level dependent (BOLD) signal is a challenging problem. In the functional magnetic resonance imaging (fMRI) literature, ...
  • Optical probe design for continuous wave near-infrared spectroscopy 
    Evcil, Kadir. (Thesis (M.S.)-Bogazici University. Institute of Biomedical Engineering, 2009., 2009.)
    The modern medicine is using optical methods more and more every day, among optical methods Near-infrared Spectroscopy is one of the most appealing techniques. Near-infrared spectroscopy is a noninvasive, safe, reliable ...
  • Optimization of FNIRS probe geometry to eliminate non-brain tissue contamination 
    Tümer, Ayşegül. (Thesis (M.S.)-Bogazici University. Institute of Biomedical Engineering, 2014., 2014.)
    Functional near infrared spectroscopy (fNIRS) is a developing non-invasive technique used for measurement of oxygenation in the adult and newborn human brain during cognitive tasks. The oxygenation in the brain is expressed ...
  • Predictability of cognitive performance based on functional neuroimaging via fNIRS 
    Şansal, Fırat. (Thesis (M.S.)-Bogazici University. Institute of Biomedical Engineering, 2014., 2014.)
    In neuropsychology many tasks have been used to determine the cognitive ability and/or flexibility of individuals to have any prior knowledge about the psychological condition or to state the level of neuropsychological ...
  • Quantification of the effect of warm up and stretching on the oxygen metabolism using an improved version of a fNIRS device 
    Alkaş, Emir. (Thesis (M.S.)-Bogazici University. Institute of Biomedical Engineering, 2006., 2006.)
    In the vastly improved field of exercise physiology, it is an imperative to exercise a a warm up and stretching routine before training. The reasoning is closely associated with the oxygen (O2) metabolism in the blood. ...
  • Sensitivity and specificity of the multi-channel CW-fNIRS for medical purposes 
    Özdemir, Alp. (Thesis (M.S.) - Bogazici University. Institute of Biomedical Engineering, 2013., 2013.)
    In last decades, optical imaging technology has been rapidly developed and become much popular for scientific researches. Its safe, non-invasive and portable design easily integrates fNIRS to different research areas and ...
  • Similarity and consistency analysis of functional connectivity maps 
    Dalmış, Mehmet Ufuk. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2012., 2013.)
    Functional connectivity (FC) refers to statistical relations of activations of distinct neuronal populations without any reference to causal or anatomic connections. One of the problems in FC studies is, to interpret the ...
  • SOD1 A4V mutation increases Nav1.3 channel excitability on xenopus laevis oocyte 
    Kubat, Elif. (Thesis (Ph.D.)-Bogazici University. Institute of Biomedical Engineering, 2016., 2016.)
    Amyotrophic lateral sclerosis (ALS) is a lethal, paralytic disease caused by degeneration of motor neurons in the spinal cord, brain stem and motor cortex. Mutations in the gene encoding copper/zinc superoxide dismutase ...
  • Statistical analysis of cognitive signals measured by fNIRS 
    Çifçi, Rifat Koray. (Thesis (Ph.D.)-Bogazici University. Institute of Biomedical Engineering, 2008., 2008.)
    Further standardization in signal processing tools is needed in the area of functional near infrared spectroscopy (fNIRS) before it is recognized as a reliable neuroimaging modality. This thesis study attempts to present ...
  • Subband filtering of fNIRS data from schizophrenic subjects 
    Kara, Ercan. (Thesis (M.S.)-Bogazici University. Institute of Biomedical Engineering, 2008., 2008.)
    Schizophrenia is a neurological disorder and typically persists for a life. Investigation of the cerebral hemodynamics of schizophrenic patients with a rapid, non-invasive and precise technique is required to improve the ...
  • System characterization for a fast optical imager 
    Emir, Uzay Emrah. (Thesis (M.S.)-Bogazici University. Institute of Biomedical Engineering, 2003., 2003.)
    In contrast to morphological imaging, functional imaging captures information about the functioning for living tissues, such as blood circulation and oxygen metabolism, cerebral nervous system, and changes in cromophore ...
  • The effect of methylphenidate on brain hemodynamics of attention-deficit/hyperactivity disorder measured by functional near infrared spectroscopy 
    Topaloğlu, Nermin. (Thesis (M.S.)-Bogazici University. Institute of Biomedical Engineering, 2007., 2007.)
    Attention-deficit/hyperactivity disorder (ADHD) is a very common neurodevelopmental disorder. Approximately 30% 60% of individuals diagnosed with ADHD in youth have symptoms that persist into adulthood. This neurobehavioral ...
  • Wireless functional optical imager 
    Karaca, Serkan. (Thesis (M.S.)-Bogazici University. Institute of Biomedical Engineering, 2005., 2005.)
    Functional imaging of brain offers the capability to investigate cerebral blood circulation and oxygen metabolism, as well as activity levels of the nervous system. In recent years, technological progress in biophotonics ...
  • Working memory performance assessment while monitoring the prefrontal cortex hemodynamics by means of functional near infrared spectroscopy 
    Kırımlı, Ceyhun Ekrem. (Thesis (M.S.)-Bogazici University. Institute of Biomedical Engineering, 2008., 2008.)
    One of the popular experimental paradigms for functional neuroimaging studies of working memory (WM) has been the n-back task, in which subjects were asked to monitor the identity or location of a series of verbal or ...

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