ukurova University

Adana, Turkey

ukurova University

Adana, Turkey
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Efendiolu A.,Ukurova University | Yanpar Yelken T.,Mersin University
Computers and Education | Year: 2010

The purpose of this study was to investigate the effects of two different methods on primary school teacher candidates' academic achievements and attitudes toward computer-based education, and to define their views on these methods. Both the first experimental group, programmed instruction (PI), and the second experimental group, meaningful learning (ML), included 36 students separately. While a significant difference was found between the groups regarding academic achievements, no significant difference was found between the groups' attitude scores. There was no significant difference between the academic achievements of the students according to their genders in both groups. In addition, while there was no significant difference between the pre-test and post-test attitudes of students in the PI group, a significant difference was determined in the ML group. Generally, in the PI group, students considered the method effective but boring. Besides, students in the ML group had positive views on the method. © 2010 Elsevier Ltd. All rights reserved.

Ersoz Kaya I.,Mersin University | Ibrikci T.,Ukurova University | Ersoy O.K.,Purdue University
Expert Systems with Applications | Year: 2011

Recognizing that many intrinsically disordered regions in proteins play key roles in vital functions and also in some diseases, identification of the disordered regions has became a demanding process for structure prediction and functional characterization of proteins. Therefore, many studies have been motivated on accurate prediction of disorder. Mostly, machine learning techniques have been used for dealing with the prediction problem of disorder due to the capability of extracting the complex relationships and correlations hidden in large data sets. In this study, a novel method, named Border Vector Detection and Extended Adaptation (BVDEA) was developed for predicting disorder as an alternative accurate classifier. The classifier performs the predictions by using three types of structural features belonging to proteins. For attesting the performance of the method, three computational learning techniques and eleven specific tools were used for comparison. Training was executed based on the data by 5-fold cross validation. When compared with the two learning methods of LVQ and BVDA, the proposed method gives the best success on classification. The BVDEA also provides faster and more robust learning as compared to the others. The new method provides a significant contribution to predicting disorder and order regions of proteins. © 2011 Elsevier Ltd. All rights reserved.

Ozer H.T.,Ukurova University | Ozbalkan Z.,Ankara Numune Research and Education Hospital
International Journal of Clinical Rheumatology | Year: 2010

Over the last decade, TNF-α antagonists became the most powerful tools for controlling patient suffering from a number of rheumatic diseases. Infliximab, etanercept and adalimumab can induce remission and prevent both clinical and radiological disease progression in rheumatoid arthritis with significant improvement in patients symptoms, function and quality of life. They improve joint symptoms and significantly retard radiographic progression in psoriatic arthritis. TNF-α antagonists have been demonstrated to reduce disease activity, retard radiologic progression and increase quality of life in ankylosing spondylitis patients. Long-term follow-up studies demonstrated sustained efficacy and acceptable safety profiles that were comparable in rheumatoid arthritis, ankylosing spondylitis and psoriatic arthritis. Etanercept is the only US FDA-approved TNF antagonist for juvenile rheumatoid arthritis. TNF-α antagonists may improve some clinical manifastations of Behets disases, including uveitis. Tuberculosis and some other granulomatous infections are likely to occur more frequently among patients treated with monoclonal antibodies than among those treated with soluble TNF receptors. During the first 6 years of therapy, no overall elevation of cancer risk was observed with any of the three TNF antagonists. TNF antagonists were not associated with any major further increase in the already increased lymphoma risk in rheumatoid arthritis. Frequent monitoring of serum transaminase levels and viral load was suggested for TNF antagonist use in hepatitis B and C infection. They might reduce some important costs to the patients; however, studies with additional detailed cost calculations are required. © 2010 Future Medicine Ltd.

Grass M.E.,Lawrence Berkeley National Laboratory | Grass M.E.,Hanyang University | Karlsson P.G.,VG Scienta | Aksoy F.,Lawrence Berkeley National Laboratory | And 7 more authors.
Review of Scientific Instruments | Year: 2010

During the past decade, the application of ambient pressure photoemission spectroscopy (APPES) has been recognized as an important in situ tool to study environmental and materials science, energy related science, and many other fields. Several APPES endstations are currently under planning or development at the USA and international light sources, which will lead to a rapid expansion of this technique. The present work describes the design and performance of a new APPES instrument at the Advanced Light Source beamline 9.3.2 at Lawrence Berkeley National Laboratory. This new instrument, Scienta R4000 HiPP, is a result of collaboration between Advanced Light Source and its industrial partner VG-Scienta. The R4000 HiPP provides superior electron transmission as well as spectromicroscopy modes with 16 μm spatial resolution in one dimension and angle-resolved modes with simulated 0.5° angular resolution at 24° acceptance. Under maximum transmission mode, the electron detection efficiency is more than an order of magnitude better than the previous endstation at beamline 9.3.2. Herein we describe the design and performance of the system, which has been utilized to record spectra above 2 mbar. © 2010 American Institute of Physics.

Deletioglu D.,Mustafa Kemal University | Yalcinkaya S.,Mustafa Kemal University | Demetgul C.,Mustafa Kemal University | Timur M.,Mustafa Kemal University | Serin S.,Ukurova University
Materials Chemistry and Physics | Year: 2011

The complex of copper (II) with N,N′-bis(3-methoxysalicylidene)-2- aminobenzylamine (H2L) was synthesized and characterized by elemental analysis, magnetic susceptibility, UV-vis. and FT-IR spectroscopy. The results showed that the tetradentate ligand coordinated to the Cu(II) ion through the azomethine nitrogen and phenolic oxygen atoms. The prepared complex [CuL] was electropolymerized on platinum electrode surface in a 0.1 mol dm-3 solution of lithium perchlorate in acetonitrile by cyclic voltammetry between 0 and 1.6 V vs. Ag/Ag+. Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), conductance measurements, FT-IR and SEM were used to characterize polymer film of Cu(II) complex. The reduction of hydrogen peroxide on poly[CuL] has been investigated mainly in phosphate buffer medium (pH 7.2), between 0 and -0.8 V versus Ag/Ag+ at a scan rate 0.1 V s-1. © 2011 Elsevier B.V. All rights reserved.

Cabbar F.,Yeditepe University | Guler N.,Yeditepe University | Kurkcu M.,ukurova University | Iseri U.,Yeditepe University | Sencift K.,Yeditepe University
Journal of Oral and Maxillofacial Surgery | Year: 2011

Purpose: The purpose of this study was to compare Unilab Surgibone (USB) (Mississauga, Ontario, Canada), a bone xenograft (bovine), with platelet-rich plasma (PRP) and USB without PRP to augment the human maxillary sinus in preparation to receive dental implants. Patients and Methods: Patients who had bilateral pneumatized maxillary sinuses were included. Sinuses on one side were augmented with the USB-PRP combination and formed the study group, whereas the opposite-side sinuses were augmented with USB alone and served as controls. Bone biopsy specimens were taken during implant placement at 6.8 ± 0.9 months after maxillary sinus floor augmentation. Resonance frequency analysis measurements were performed at implant placement (first control) and before the prosthetic stage (second control), at 6.5 ± 0.7 months after implant surgery. Results: There were 10 patients (7 men and 3 women; mean age, 53.7 ± 0.8 years). Integration between new bone and residual grafts was histologically observed in all samples. The volumes of soft tissue were 59.9% ± 7.5% and 57.8% ± 4.4% in the control and study groups, respectively; residual graft, 21.9% ± 6.6% and 23.6% ± 5.9%, respectively; new bone, 15.8% ± 4.8% and 16.0% ± 3.8%, respectively; and trabecular bone, 64.7% ± 22.5% and 69.1% ± 18.6%, respectively. A positive correlation was found between new bone volume and trabecular bone volume (P =.0001). The mean Implant Stability Quotient (ISQ) values were 71.7 ± 4.9 and 70.3 ± 5.7 in the control and study groups, respectively, at first control and 75.4 ± 6.4 and 74.4 ± 6.4, respectively, at second control. The mean ISQ values at second control in both groups were significantly higher than at first control (P =.043 and P =.028, respectively). No statistically significant differences were observed between groups (P >.05). Conclusion: The combination of USB and PRP does not have any effect on new bone formation and implant stabilization. © 2011 American Association of Oral and Maxillofacial Surgeons.

Solmaz R.,Bingöl University | Altunba E.,Ukurova University | Karda G.,Ukurova University
Materials Chemistry and Physics | Year: 2011

In this study, the inhibition effect of 2-((5-mercapto-1,3,4-thiadiazol-2- ylimino)methyl)phenol Schiff base (MTMP) on mild steel corrosion in 0.5 M HCl solution was studied. For this aim, electrochemical techniques such as potentiodynamic polarization curves, weight loss (WL), electrochemical impedance spectroscopy (EIS) and linear polarization resistance (LPR) were used. It was shown that, the MTMP Schiff base has remarkable inhibition efficiency on the corrosion of mild steel in 0.5 M HCl solution. Polarization measurements indicated that, the studied inhibitor acts as mixed type corrosion inhibitor with predominantly control of cathodic reaction. The inhibition efficiency depends on the concentration of inhibitor and reaches 97% at 1.0 mM MTMP. The remarkable inhibition efficiency of MTMP was discussed in terms of blocking of electrode surface by adsorption of inhibitor molecules through active centers. The adsorption of MTMP molecules on the mild steel surface obeys Langmuir adsorption isotherm. © 2010 Elsevier B.V. All rights reserved.

Eker I.,Ukurova University
ISA Transactions | Year: 2010

In this article, a second-order sliding mode control (2-SMC) is proposed for second-order uncertain plants using equivalent control approach to improve the performance of control systems. A Proportional + Integral + Derivative (PID) sliding surface is used for the sliding mode. The sliding mode control law is derived using direct Lyapunov stability approach and asymptotic stability is proved theoretically. The performance of the closed-loop system is analysed through an experimental application to an electromechanical plant to show the feasibility and effectiveness of the proposed second-order sliding mode control and factors involved in the design. The second-order plant parameters are experimentally determined using inputoutput measured data. The results of the experimental application are presented to make a quantitative comparison with the traditional (first-order) sliding mode control (SMC) and PID control. It is demonstrated that the proposed 2-SMC system improves the performance of the closed-loop system with better tracking specifications in the case of external disturbances, better behavior of the output and faster convergence of the sliding surface while maintaining the stability. © 2010 ISA. Published by Elsevier Ltd. All rights reserved.

Saribulut L.,Ukurova University | Tumay M.,Ukurova University
Electric Power Systems Research | Year: 2010

Space vector modulation (SVM) is one of the most popular PWM techniques used in multilevel inverters. The calculation of reference vector location is very important for SVM technique to obtain exact switching times and to determine correct space vectors. Balanced/unbalanced voltage disturbance occurred in a three-phase system affects the switching times and output voltage of the multilevel inverter. In this study, effects of the disturbances such as line-line faults, balanced and unbalanced voltage sags/swells to SVM technique are investigated and a new technique derived from Clarke transformation is proposed. The effects of disturbances are minimized with this new method. Power System Computer-Aided Design is used to simulate the proposed test system. © 2010 Elsevier B.V. All rights reserved.

PubMed | ukurova University
Type: Journal Article | Journal: International archives of allergy and immunology | Year: 2016

Although food allergies (FAs) occur most commonly during the 1st year of life, there is limited information available regarding the epidemiology of FAs. In this study, we investigated the incidence of FA and the associated risk factors during the 1st year of life in southeast Turkey.This study is a prospective evaluation of 1,377 infants born at the Balcal Hospital (ukurova University) and includes four routine follow-up assessments until the age of 1 year. At birth, a physical examination was performed, cord blood samples were taken, and parents completed a baseline questionnaire. Follow-up visits were scheduled at 3, 6 and 12 months and included the infants physical examination and a follow-up questionnaire. A skin prick test (SPT) was performed and food-specific IgE levels were measured at 6 and 12 months. Telephone interviews were conducted when the infants were 9 months of age, and the questionnaire was administered. The diagnosis of FA was based on food-specific IgE levels, positive SPT results, associated clinical findings and an oral food challenge (OFC) test.Patient histories, physical examinations and laboratory results indicated a possible FA in 90 infants (6.5%) during the 1st year of life. All of them underwent OFC testing with the suspected foods, and FA was confirmed in 33 cases (2.4%). Cows milk allergy was the major cause of FA. Skin reactions were major clinical findings in FA. A family history of atopy was identified as the major risk factor for FA.The prevalence and risk factors of FA in our region are consistent with those reported in the literature.

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