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Search Results: 1 - 10 of 207 matches for " Ezgi Tuncay "
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A Case of Pituitary Hemorrhage Following Cardiopulmonary Bypass Surgery  [PDF]
Ozgen Ilgaz Kocyigit, Serdar Kabatas, Erdinc Civelek, Ezgi Tuncay, Oguz Omay, Tufan Cansever, Ayda Turkoz
Surgical Science (SS) , 2011, DOI: 10.4236/ss.2011.23034
Abstract: A 68-year-old female patient with previous history of transsphenoidal hypophysectomy operation underwent three-vessel coronary artery bypass graft (CABG) surgery for extensive coronary artery disease. Preoperative neurological examination revealed sequelae visual loss at right temporal visual field. Follow-up Magnetic Resonance Imaging studies showed a residual hypophyseal tumor tissue extending to suprasellar area. No additional pathology was detected in the early postoperative cranial control CT, but aggravation of visual field defect was determined. Coincidently, cranial magnetic resonance imaging (MRI) showed hemorrhage into the tumor tissue. We decided to follow-up the patient who exhibited no additional symptoms and was discharged well on the fifth day due to the signs of resolution of hemorrhage. Follow-up controls of the patient at sixth and twelfth months demonstrated normal hormone levels without any additional clinical complaints. We present preoperative assessment, perioperative anesthesia management, and postoperative clinical follow-up of a patient with a residual hypophyseal tumor.
Determination of Shearing Properties for Tubular Pinewood under Torsion  [PDF]
Ezgi Günay, Emre Uludogan
Materials Sciences and Applications (MSA) , 2015, DOI: 10.4236/msa.2015.61007
Abstract: In this study, tubular pinewood (Pinus sylvestris L.) specimens are tested and shear strain measurements are performed by applying torsion in z direction in the consideration of light weight aircraft engineering. The objective of this paper is to contribute and generate the nonlinear material model in terms of shear modulus presented with power functions under the consideration of nonlinear behavior of wood under torque. Strain gauge measurements are performed for the maximum shear stresses which develop on the tubular specimen, along the radial r(rin, rout), circumferential Φ(Φin, Φout) and z directions, in a point-wise manner. The data is gathered and examined for the determination of the local variations of empirical shear modulus functions on transversely isotropic surfaces of the specimens. The coordinate dependent shear modulus functions of GzΦ(r), GzΦ(Φ), GzΦ(z) are derived for GzΦ(r, Φ, z)as the function of r, Φ and z, respectively, by analyzing the gathered data. It is proposed to represent the shear modulus functions, GzΦ(Φ) and GzΦ(z) with the parabolic polynomials, and, to represent the shear modulus function GzΦ(r) with a linear equation.
Comparative Analysis of the Quality Perception in Public Spaces of Duzce City  [PDF]
Elif Kutay Karacor, Ezgi Akcam
Current Urban Studies (CUS) , 2016, DOI: 10.4236/cus.2016.43017
Abstract: Public spaces in urban areas were affected from neoliberal policies in terms of their management and ownership. Accordingly, several researchers handled public spaces from different perspectives considering on advantages or disadvantages of neoliberal policies. Four key attributes of successful places: accessibility, comfort, socialization, and activity are accepted as quality indicators of today’s urban spaces and they became an outline for this study. The aim of this study is to evaluate the quality of different type public spaces and to determine the reason why these differences. Therefore, quality differences resulting from management and ownership were evaluated in scope of public space literature. Our findings put forward that ownership of spaces is not a significant factor perceiving the quality of spaces. Besides, publicly owned urban spaces were found as not always preferable and the ownership was not a basis factor for quality perception.
A Modified Strategic Position and Action Evaluation (SPACE) Matrix Method
Lecture Notes in Engineering and Computer Science , 2013,
Oscillation of solutions for odd-order neutral functional differential equations
Tuncay Candan
Electronic Journal of Differential Equations , 2010,
Abstract: In this article, we establish oscillation criteria for all solutions to the neutral differential equations $$ [x(t)pm ax(tpm h)pm bx(tpm g)]^{(n)} =pint_c^d x(t-xi)dxi+qint_c^d x(t+xi)dxi, $$ where $n$ is odd, $h$, $g$, $a$ and $b$ are nonnegative constants. We consider 10 of the 16 possible combinations of +/- signs, and give some examples to illustrate our results.
Determining Effectiveness of Student Guiding Material Based On the 5E Model in "Force and Motion"
Tuncay ?ZSEVGE?
Journal of Turkish Science Education , 2006,
Abstract: The aim of the study is to determine effectiveness of the student guiding material based on the 5E model, students’ achievement and their attitudes. Active learning can be boring and monotonous after a while. To recover the situation, it could be helpful to benefit from some solutions; such as, reward, competition or changing of learning environment. In this study, the materials based on 5E learning model have not a positive effect on students’ attitudes throughout very limited period of time. To determine the change on students’ attitudes, the implementation process should be take relatively longer period of time.
Shannon entropies of the distributions of various electroencephalograms from epileptic humans
Caglar Tuncay
Physics , 2009,
Abstract: 1) Harmonic oscillations (HO) in numerous electroencephalograms (EEG) from different humans are introduced. 2) The probability density functions (PDF, p(X)) of the EEG voltages (X) are normal (Gauss) for OO whereas, the plots for the distributions of HO (pure) are convex. Gaussians for OO may turn to be convex as HO become dominant in MO or vice versa. However, distributions of the most of the data are found normal which means that most of the EEG oscillations consist of OO (or MO). 3) Shannon entropies (information measures) of the distributions of the data from different brain regions in the ictal intervals or inter-ictal intervals are calculated for each individual recording and compared. The averages of Shannon entropies over the individual recordings during the ictal intervals come out bigger than those from the inter-ictal intervals. These averages are found to be bigger for the data from epileptogenic brain areas than those recorded from non epileptogenic ones in different intervals.
Inverse Scattering Transform and the Theory of Solitons
Tuncay Aktosun
Physics , 2009, DOI: 10.1007/978-0-387-30440-3_295
Abstract: A review of the inverse scattering transform is given, and an introduction to solitons is provided.
Entropy analyses of spatiotemporal synchronizations in brain signals from patients with focal epilepsies
Caglar Tuncay
Physics , 2010,
Abstract: The electroencephalographic (EEG) data intracerebrally recorded from 20 epileptic humans with different brain origins of focal epilepsies or types of seizures, ages and sexes are investigated (nearly 700 million data). Multi channel univariate amplitude analyses are performed and it is shown that time dependent Shannon entropies can be used to predict focal epileptic seizure onsets in different epileptogenic brain zones of different patients. Formations or time evolutions of the synchronizations in the brain signals from epileptogenic or non epileptogenic areas of the patients in ictal interval or inter-ictal interval are further investigated employing spatial or temporal differences of the entropies.
Physics of randomness and regularities for cities, languages, and their lifetimes and family trees
C. Tuncay
Physics , 2007, DOI: 10.1142/S0129183107011625
Abstract: Time evolution of the cities and of the languages is considered in terms of multiplicative noise and fragmentation processes; where power law (Pareto-Zipf law) and slightly asymmetric log-normal (Gauss) distribution result for the size distribution of the cities and for that of the languages, respectively. The cities and the languages are treated differently (and as connected; for example, the languages split in terms of splitting the cities, etc.) and thus two distributions are obtained in the same computation at the same time. Evolutions of lifetimes and families for the cities and the languages are also studied. We suggest that the regularities may be evolving out of randomness, in terms of the relevant processes.
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