Showing papers by "Yaşar University published in 2006"
TL;DR: It is shown that the feedback synapses form a negative feedback loop that controls the speed and amplitude of photoreceptor responses and hence the quality of the transmitted signals.
Abstract: At the layer of first visual synapses, information from photoreceptors is processed and transmitted towards the brain. In fly compound eye, output from photoreceptors (R1–R6) that share the same visual field is pooled and transmitted via histaminergic synapses to two classes of interneuron, large monopolar cells (LMCs) and amacrine cells (ACs). The interneurons also feed back to photoreceptor terminals via numerous ligand-gated synapses, yet the significance of these connections has remained a mystery. We investigated the role of feedback synapses by comparing intracellular responses of photoreceptors and LMCs in wild-type Drosophila and in synaptic mutants, to light and current pulses and to naturalistic light stimuli. The recordings were further subjected to rigorous statistical and information-theoretical analysis. We show that the feedback synapses form a negative feedback loop that controls the speed and amplitude of photoreceptor responses and hence the quality of the transmitted signals. These results highlight the benefits of feedback synapses for neural information processing, and suggest that similar coding strategies could be used in other nervous systems.
107 citations
TL;DR: In this article, the wear amounts of Mo coatings deposited on ductile iron substrates using an atmospheric plasma-spray system were investigated for different loads and environment conditions, and the numerical results obtained via a neural network model were compared with the experimental results.
71 citations
TL;DR: The results demonstrate consistently superior performance of the covariance methods over Yule–Walker AR and Welch methods.
Abstract: Brain is one of the most critical organs of the body. Synchronous neuronal discharges generate rhythmic potential fluctuations, which can be recorded from the scalp through electroencephalography. The electroencephalogram (EEG) can be roughly defined as the mean electrical activity measured at different sites of the head. EEG patterns correlated with normal functions and diseases of the central nervous system. In this study, EEG signals were analyzed by using autoregressive (parametric) and Welch (non-parametric) spectral estimation methods. The parameters of autoregressive (AR) method were estimated by using Yule---Walker, covariance and modified covariance methods. EEG spectra were then used to compare the applied estimation methods in terms of their frequency resolution and the effects in determination of spectral components. The variations in the shape of the EEG power spectra were examined in order to epileptic seizures detection. Performance of the proposed methods was evaluated by means of power spectral densities (PSDs). Graphical results comparing the performance of the proposed methods with that of Welch technique were given. The results demonstrate consistently superior performance of the covariance methods over Yule---Walker AR and Welch methods.
61 citations
TL;DR: An evaluation of problems faced by teachers when introducing object oriented concepts and programming to beginners is presented and some possible approaches for improving the quality and success of such courses are discussed.
Abstract: Teaching object oriented programming has become a rapidly expanding preference at various educational environments. However, teachers usually experience problems when introducing object oriented concepts and programming to beginners. How to teach the fundamentals of object oriented programming at an introductory level course is still a common subject for debate. In this paper, an evaluation of these problems is presented and some possible approaches for improving the quality and success of such courses are discussed.
4 citations
04 Dec 2006
TL;DR: The MEWS system works as individual sensors obtain EEG signals from patient who has epilepsy and establishes a communication between the patient and Calling Center (CC) in case of an epileptic attack.
Abstract: This paper presents a new design of mobile epilepsy warning system for medical application in telemedical environment. Mobile Epilepsy Warning System (MEWS) consists of a wig with a cap equipped with sensors to get Electroencephalogram (EEG) signals, a collector which is used for converting signals to data, Global Positioning System (GPS), a Personal Digital Assistant (PDA) which has Global System for Mobile (GSM) module and execute Artificial Neural Network (ANN) software to test current patient EEG data with pre-learned data, and a calling center for patient assistance or support. The system works as individual sensors obtain EEG signals from patient who has epilepsy and establishes a communication between the patient and Calling Center (CC) in case of an epileptic attack. MEWS learning process has artificial neural network classifier, which consists of Multi Layered Perceptron (MLP) neural networks structure and back-propagation training algorithm.
3 citations
Journal Article•
TL;DR: A special application software, developed for this purpose, is used to demonstrate the applicability of a database-integrated information processing system to alleviate the burden on educators.
Abstract: This article deals with the use of a computer software in special education. Preparation of Individual Education Plan (IEP) and assessment of predefined IEP are the most important stages in the area of special education for teaching individuals with learning disabilities. A special application software which was developed for this purpose, is used to demonstrate the applicability of a database-integrated information processing system to alleviate the burden on educators. The software allows preparation of individualized education programmes based on predefined objectives and behaviours, and assessment of school and family trainings of students. The software has a user-friendly interface and its design includes graphical tools.
2 citations
TL;DR: In this sense, globalization has been disapproved by the nationalism followers and therefore has been excoriated as discussed by the authors, which is due to the fact that there are not only winners in this case but also losers.
Abstract: As the world becomes more and more affected by globalization, its opponents increase in number as well as its followers. This is due to the fact that there are not only winners in this case but also losers. The new global order introduces new advantages and disadvantages to economics, politics and social life. On one hand we have people living a prosperous life, having the chance to use inexpensive and high quality products. On the other hand we have the poor who have to face the difficulties caused by the irrational production and consumption plans, contaminated environment and unsound health and education systems. Globalization was first considered as a concept to bring the nations together, however according to some people it has turned out to become an economic and social gap between the north and the south. The multinational companies’ attitudes and flexible working styles have affected some countries’ employment structures. By means of economic liberalization, it has enabled the foreign investments settle down easily in any country. In this sense, globalization has been disapproved by the nationalism followers and therefore has been excoriated.
2 citations
TL;DR: An assesment of the long awaited holographic data storage technology and its possible impact on data processing appears to have a serious potential to increase current storage capacities significantly at commercially realistic price levels.
Abstract: This article presents an assesment of the long awaited holographic data storage technology and its possible impact on data processing.Despite some doubts,three dimensional holographic memory appears to have a serious potential to increase current storage capacities significantly at commercially realistic price levels.