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Search Results: 1 - 10 of 537 matches for " Ozgur Berkay Aksu "
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Prevalence of Restless Legs Syndrome in Patients Treated with Peritoneal Dialysis: Clinical and Biochemical Characteristics among Patients with and without Restless Legs Syndrome  [PDF]
Selda Korkmaz, Bulent Tokgoz, Sevda Ismailogullari, Ismail Kocyigit, Merva Kocyigit, Ozgur Berkay Aksu, Murat Aksu
Open Journal of Nephrology (OJNeph) , 2013, DOI: 10.4236/ojneph.2013.31008
Abstract: Introduction and Aims:This is a prospective study identifying prevalence of Restless Legs Syndrome (RLS) in patients ongoing peritoneal dialysis (PD) due to end stage renal disease (ESRD) and comparing clinical and biochemical characteristics among patients with and without RLS. Methods: Two hundred ESRD patients who received PD at least six months assessed by neurologist and nephrologist with regards to presence of RLS. Also, clinical and biochemical features of these patients are determined. One hundred and forty four patients were excluded from study because they had other secondary causes of RLS except for ESRD. Results: Thirteen of 56 patients (23.2%) had RLS. The use of vitamin B + folic acid supplements was significantly lower in patients with RLS than in those without RLS (69.2% vs 97.7%; p = 0.008). There was no significant difference between patient groups with and without RLS in terms of age, gender, body mass index, cause of ESRD, peritoneal membrane transport characteristic, smoking, consuming alcohol, use of erythropoietin, duration of PD, hemoglobin, serum calcium, serum phosphorus, serum albumin, levels of serum iron, total iron binding capacity, ferritin, folic acid and vitamin B12, transferrin saturation, weekly Kt/V urea value, and amount of residual urine volume (p > 0.05). Conclusion: RLS is more common among PD patients than general population. Although essential cause is not exactly known, use of folic acid and vitamin B complex decrease the RLS prevalence in this particular patient group.
FPGA Implementable Frame Synchronization Algorithm for Burst Mode GMSK  [PDF]
Onur Berkay Gamgam, Erdinc Levent Atilgan
Communications and Network (CN) , 2017, DOI: 10.4236/cn.2017.91005
Abstract: In time division multiple access (TDMA) communication systems, correctly estimating the synchronization parameters is very important for reliable data transfer. The algorithms used for frequency/phase and symbol timing estimates are generally accepted as knowing the start of signal (SoS) parameter. Therefore, within these parameters, the SoS parameter is of particularly great importance. In this study, a reduced version of the SoS estimation algorithm introduced by Hosseini and Perrins is presented to estimate SoS for Gaussian Minimum Shift Keying (GMSK) modulated signals in burst format over additive white Gaussian noise (AWGN) channels. The reduced algorithm can be implemented on FPGA by using half the number of complex multipliers that would be required by the double correlation method and is robust to carrier frequency/phase errors. Simulations performed under 0.1 normalized frequency offset conditions show that the proposed algorithm has a probability of false lock which is less than 7×10-2, even at 0 dB SNR level.
The Effect of an Instruction Designed by Cognitive Load Theory Principles on 7th Grade Students’ Achievement in Algebra Topics and Cognitive Load  [PDF]
Aygil Takir, Meral Aksu
Creative Education (CE) , 2012, DOI: 10.4236/ce.2012.32037
Abstract: The purpose of this study was to investigate the effect of an instruction designed by the Cognitive Load Theory (CLT) principles on 7th grade students’ achievement in Algebra topics and cognitive load. A quasi-experimental study was conducted in totally six weeks with 80 students. The instruction designed by CLT principles was used in the experimental group, while the instruction recommended by the Ministry of Education (MONE) was used in the control group. Researchers developed Teachers’ Guidelines and Students’ Booklets for using in the experimental group. At the end of each unit, the Subjective Rating Scale (SRS) was used to measure students’ cognitive load. At the end of the treatment, the Algebra Achievement Test (AAT) was administrated to both of the groups. Both descriptive and inferential statistical techniques were used for analyzing data. Results showed that instruction designed by CLT principles was effective for the Algebra teaching with the limitations of the study.
Asymptotics of spectral gaps of 1D Dirac operator with two exponential terms potential
Berkay Anahtarci,Plamen Djakov
Mathematics , 2013,
Abstract: The one-dimensional Dirac operator \begin{equation*} L = i \begin{pmatrix} 1 & 0 \\ 0 & -1 \end{pmatrix} \frac{d}{dx} +\begin{pmatrix} 0 & P(x) \\ Q(x) & 0 \end{pmatrix}, \quad P,Q \in L^2 ([0,\pi]), \end{equation*} considered on $[0,\pi]$ with periodic and antiperiodic boundary conditions, has discrete spectra. For large enough $|n|,\, n \in \mathbb{Z}, $ there are two (counted with multiplicity) eigenvalues $\lambda_n^-,\lambda_n^+ $ (periodic if $n$ is even, or antiperiodic if $n$ is odd) such that $|\lambda_n^\pm - n |<1/2.$ We study the asymptotics of spectral gaps $\gamma_n =\lambda_n^+ - \lambda_n^-$ in the case $$P(x)=a e^{-2ix} + A e^{2ix}, \quad Q(x)=b e^{-2ix} + B e^{2ix},$$ where $a, A, b, B$ are nonzero complex numbers. We show, for large enough $m,$ that $\gamma_{\pm 2m}=0 $ and \begin{align*} \gamma_{2m+1} = \pm 2 \frac{\sqrt{(Ab)^m (aB)^{m+1}}}{4^{2m} (m!)^2 } \left[ 1 + O \left( \frac{\log^2 m}{m^2}\right) \right], \end{align*} \begin{align*} \gamma_{-(2m+1)} = \pm 2\frac{\sqrt{(Ab)^{m+1} (aB)^m}}{4^{2m} (m!)^2} \left[ 1 + O \left( \frac{\log^2 m}{m^2}\right) \right]. \end{align*}
Improved asymptotics of the spectral gap for the Mathieu operator
Berkay Anahtarci,Plamen Djakov
Mathematics , 2012,
Abstract: The Mathieu operator {equation*} L(y)=-y"+2a \cos{(2x)}y, \quad a\in \mathbb{C},\;a\neq 0, {equation*} considered with periodic or anti-periodic boundary conditions has, close to $n^2$ for large enough $n$, two periodic (if $n$ is even) or anti-periodic (if $n$ is odd) eigenvalues $\lambda_n^-$, $\lambda_n^+$. For fixed $a$, we show that {equation*} \lambda_n^+ - \lambda_n^-= \pm \frac{8(a/4)^n}{[(n-1)!]^2} [1 - \frac{a^2}{4n^3}+ O (\frac{1}{n^4})], \quad n\rightarrow\infty. {equation*} This result extends the asymptotic formula of Harrell-Avron-Simon, by providing more asymptotic terms.
The Effects of Sugozu Power Plant on Water Quality in the Iskenderun Bay, Eastern Mediterranean
Mehmet Aksu
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2012.224.228
Abstract: To determine water quality of the impact area of Sugozu power plant, four samplings were carried out from 12 stations in May, August and October, 2009 and January, 2010. Water temperature, pH, salinity, dissolved oxygen, Secchi disc, nutrients (nitrate-nitrogen, ammonium-nitrogen, phosphate-phosphorus and silicate) and chlorophyll a were measured in the water column. Monitoring of water quality parameters showed that Sugozu power plant did not cause detectable changes in the water column. Variations in the investigated parameters were rather seasonal. These results are believed to be the outcome of environmental management system of the plant. By using high quality fuel and advanced burning technologies, treating flu gas and wastewater, it was possible to reduce its environmental effects.
Barbie Against Superman: Gender Stereotypes and Gender Equity in the Classroom
Bengü AKSU
Journal of Language and Linguistic Studies , 2005,
Abstract: In this age of mass media, we are surrounded with images that promote certain genderroles. These hidden forces shape us and our world view, often without us being aware thatthey are doing so. Gender stereotypes occur when generic attributes, opinions or roles havebeen applied toward either gender and the results are apparent everywhere in our society.From the point of view of education, it is important to use and/or to refuse genderstereotypes in the classroom.Since education is a significant social area where gender segregation and the reproductionof gender stereotypes are generated, there is, without doubt, much can be done in this areato prevent this phenomenon. As gender equity, is prevalent part of our society, teachersmust help their students identify where it exists in the classroom and school environment.
Fast SVM-based Feature Elimination Utilizing Data Radius, Hard-Margin, Soft-Margin
Yaman Aksu
Computer Science , 2012,
Abstract: Margin maximization in the hard-margin sense, proposed as feature elimination criterion by the MFE-LO method, is combined here with data radius utilization to further aim to lower generalization error, as several published bounds and bound-related formulations pertaining to lowering misclassification risk (or error) pertain to radius e.g. product of squared radius and weight vector squared norm. Additionally, we propose additional novel feature elimination criteria that, while instead being in the soft-margin sense, too can utilize data radius, utilizing previously published bound-related formulations for approaching radius for the soft-margin sense, whereby e.g. a focus was on the principle stated therein as "finding a bound whose minima are in a region with small leave-one-out values may be more important than its tightness". These additional criteria we propose combine radius utilization with a novel and computationally low-cost soft-margin light classifier retraining approach we devise named QP1; QP1 is the soft-margin alternative to the hard-margin LO. We correct an error in the MFE-LO description, find MFE-LO achieves the highest generalization accuracy among the previously published margin-based feature elimination (MFE) methods, discuss some limitations of MFE-LO, and find our novel methods herein outperform MFE-LO, attain lower test set classification error rate. On several datasets that each both have a large number of features and fall into the `large features few samples' dataset category, and on datasets with lower (low-to-intermediate) number of features, our novel methods give promising results. Especially, among our methods the tunable ones, that do not employ (the non-tunable) LO approach, can be tuned more aggressively in the future than herein, to aim to demonstrate for them even higher performance than herein.
Berkay BARI?,R?za ATAV
EJOVOC : Electronic Journal of Vocational Colleges , 2012,
Abstract: Günümüzde tekstil terbiyesinde nem kazanmaya ba lam olan kavramlardan biri nano-teknolojidir. Tekstil terbiyesinde nano-teknolojik ürünler kullan larak konvansiyonel y ntemlere k yasla bir ok avantajlar sa lanabilmektedir. Bu anlamda henüz tekstil terbiyesinde kullan m olduk a yeni olan bir nano-teknolojik ürün de dendrimerdir. Bu al mada dendrimer teknolojisi kullan larak pamuklu kuma lara aromaterapi fonksiyonelli i kazand r lmas ama lanm t r. Yap lan al malar sonucunda dendrimerlerin kontrollü sal n m mekanizmas olma zelliklerinden yararlan larak, aromaterapi zelli ine sahip pamuklu fonksiyonel kuma elde edilebilece i g rülmü tür.
Autoinflammatory diseases in childhood  [PDF]
Betul Sozeri, Ozgur Kasapcopur
Modern Research in Inflammation (MRI) , 2014, DOI: 10.4236/mri.2014.31002

Autoinflammatory diseases are defined as recurrent attacks of systemic inflammation that are often unprovoked (or triggered by a minor event) related to a lack of adequate regulation of the innate immune system. Within the past decade, the list of autoinflammatory diseases has included cryopyrin-associated periodic syndromes, familial Mediterranean fever, mevalonate kinase deficiency, tumor necrosis factor receptor-associated periodic syndrome, hereditary pyogenic disorders, pediatric granulomatous autoinflammatory diseases, idiopathic febrile syndromes (systemic-onset juvenile idiopathic arthritis, PFAPA syndrome), complement dysregulation syndromes and Behcet’s disease. The hereditary autoinflammatory diseases are a group of Mendelian disorders characterized by seemingly unprovoked fever and localized inflammation. Autoinflammatory diseases can activate NOD-like receptors and inflammasome products including especially interleukin 1β. In this review, it focuses on how recent advances have impacted hereditary autoinflammatory diseases.

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