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Electrophysiological data processing can take place both in time and in frequency domains as well as in the joint time-frequency domain. Short Time Fourier Transform and Wavelet Transform are commonly used time-frequency analysis methods. The limitations of these methods initiated the use of methods such as synchrosqueezing and multivariate synchrosqueezing methods. In our proposed method 88.9%, 77...
In this study the photoplethysmography (PPG) signals while mental workload during resting state and physical fatigue and tiredness are investigated. The aim is to examine the relationship between restricted physical fatigue and mental workload, and effects of mental workload on PPG during pre- and post-exercise accompanied with mathematical exercise besides physiological and electrophysiological measurements...
Brain Computer Interfaces (BCIs) provide a direct communication channel between human brain and environment. Synchronous BCIs assume that BCI users are always at control state and definitely produce a control command after a predetermined number of flashes. On the other hand, asynchronous BCIs determine the moments that BCI users focus on the BCI system to make command selection and produce control...
Continuation of vitalization of organs and tissues is an important step for rejection of implanted tissue. HUVEC (Human Umbilicial Vein Endothelial Cells) are endothelial derived cells. One of the model cell types that plays an effective role in the vascularization process and it is also widely used in terms of 3D (dimensional) tissue formation. The 3D tissue vascularization process appears to be...
In recent years, wavelet-based, Fourier-based and Hilbert-based time-frequency methods attracted attention in emotion state classification studies in human machine interaction. In particular, the Hilbert-based Empirical Mode Decomposition and Wavelet-based Discrete Wavelet Transform have found applications in emotional state analysis. In this study, a model of emotional elicitation is proposed in...
Polymers and hydrogels are used to create 3D tissue scaffolds. The hydrogel solutions that are formed using PEGDMA polymer were tried to be given antimicrobial effect by applying cold atmospheric plasma. In addition, L929 cells were encapsulated and cell viability was checked.
Liver vessel segmentation can be used for planning the operation by examining the donor liver before liver transplantation operations, region detection in disease diagnosis procedures, determination of vessel structure, automatic vessel classification, determination of lobe volumes, acquisition of vessel connections in lobe decomposition processes. In the literature, there are studies such as disease...
In this study, a system design which can follow the rehabilitation phase and perform various exercises for persons with loss in hand and arm movements after various accidents has been studied. This system consists of a two-axis drawing mechanism and electronic gloves that can be worn on hand. The patient will be asked to follow a picture placed under the mechanism and to draw picture by moving the...
Visibility graph analysis of time series became widely used as a time series analysis in the recent years. State transfer network is a network of mapping mono/multivariate time series into a network of local states based on visibility graph, it was used to study the evolutionary behavior of time series and in this study, we applied this principle to the detection of epileptic seizures. Two sets of...
Industry 4.0 will effect all sectors including the daily social life in fact as if it seems that it effects only factories. In this study, possible effects of industry 4.0 evolution over health sector including especially medical devices were investigated. Conceptually, it is aimed to achieve higher quality, cheaper and faster production via taking over the whole production process by intelligent...
Analysis and evaluation of ECG (Electrocardiogram) signals is one of the important methods used in the determination of heart diseases. Since the interpretation of ECG signals is a time consuming and demanding process for physicians, detailed analysis and interpretation software that gives the same result as the diagnosis of the physician at high rates by interpreting these signals in the computer...
Chronic Obstructive Pulmonary Disease is a common respiratory disease. The diagnosis of the disease is made by a specialist doctor according to the report given by the spirometer device, which is the gold standard method for diagnosis. This method can only be performed in hospitals with the help of a technician. However, monitoring of the disease after diagnosis is important to follow the damage that...
Specific phobia which is a state of excessive and constant fear although individuals know it is illogical. During phobia in individuals there is several changes. This study based on recorded pupil video during phobia and analysis of changes in pupil size using image processing and signal processing algorithms on this video. Feature extraction are made from the signals obtained from the pupil dimensions...
Ocular artefacts caused by eye movements can distort Electroencephalogram (EEG) recordings. It is important to obtain clean EEG signals in diagnosing and interpreting diseases. Meaningful EEG signals should not be distorted during the removal of artefacts. In this study, Independent Component Analysis and Artificial Neural Network were used together to remove ocular artefacts. The method was tested...
Regression analysis is a statistical method widely used in the literature. One of the most common uses of this method is to make a prediction. However, some assumptions must be satisfied in order to use this method properly. Each regression model obtained may not be statistically valid. Models need to meet certain qualifications in order to be valid. There are various regulatory model qualification...
In this paper, the effects of autapse on the first spike latency of the stochastic H-H neuron are examined. In the study, it is considered that H-H neuron has an electrical autapse and by applying a suprathreshold periodic signal to neuron the first spike times has been observed. Obtained results show that the first spike latency of H-H neuron increases prominently in a certain autaptic time delay...
Astrocytes are star-shaped glia cells and the most common cell type in the human brain with neurons. Astrocytes fulfill many functions in human brain. Providing support to the cells of the blood-brain barrier, balancing the extracellular ion concentration, supplying nutrients to the nerve tissue, and controlling the development of nerve cells are some of these tasks. In this study, the effects of...
Electrogastrography (EGG) is an experimental non-invasive method that reflects the myoelectrical activity of the diabetic gastroparesis (D-GP) and healthy subjects gastric system. In clinical world, endoscopy and delayed gastric emptying diagnosis test are using for understand the D-GP patient's condition which are invasive, quite expensive and uncomfortable. Therefore our aim is to evaluate the Electrogastrography...
Reliability plays an important role in the evaluation of agreement between observers. Therefore, Simple Percent Agreement Statistics, Cohen s Kappa, PABAK, Scott s agreement statistics, G-index and AC1 agreement statistics are used to calculate agreement between observers in binary diagnostic tests outcomes. This study aims to compare these agreement statistics and selection of the most suitable agreement...
In this study, the mean glanduler dose (MGD) displayed by the mammography system and the MGD calculated according to TS EN 61223-3-2 evaluation and routine testing in medical imaging departments standard have been compared. Measurements were performed in a full-field digital mammography system (FFDM) using polymethyl-methacrylate phantom (PMMA) to simulate breast thicknesses ranging from 20 mm to...
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