Hatice Cansu KIŞ

Makale/Derleme | 2019 | Oral Radiology

Objectives: The aim of this study is to investigate the effect of internal derangements and degenerative bone changes on the minimum thickness of the roof of the glenoid fossa (RGF). Methods: MRI and cone beam CT records of temporomandibular joints (TMJ) of 68 patients were evaluated retrospectively in this study. The joints were divided into three groups according to TMJ disc status which had been diagnosed in MRI: normal disc status, anterior disc displacement with reduction, and anterior disc displacement without reduction. Cone beam CT was used to evaluate the degenerative bone changes of TMJ and to measure the minimum thickness . . . of RGF. The joints were categorized as "with osteoarthritis (OA)" or "without OA". The findings of OA were determined as erosion, osteophyte, flattening, sclerosis, and pseudocyst. Results: No significant relationship was found between gender and the thickness of RGF (p > 0.05). RGF was found significantly higher in "with OA" group compared to "without OA" group (p < 0.001). No significant difference was found between disc displacement groups for minimum thickness of RGF (p > 0.005). No significant difference was found between condyles without erosion and condyles with erosion for the minimum thickness of RGF (p = 0.272). In the present study, osteophyte, sclerosis, flattening, and pseudocyst were found to be associated with the minimum thickness of RGF. Conclusions: Osteophyte, flattening, pseudocyst, and sclerosis have an influence on RGF thickness. The minimum thickness of RGF is not significantly correlated with internal derangements. Erosion is not significantly correlated with RGF thickness. RGF thickness may be unaffected by the early stages of OA Daha fazlası Daha az

Hatice Cansu KIŞ

Makale/Derleme | 2019 | Oral Radiology

Objectives Lactation-induced bone loss of lumbar spine, hip, femur and distal radius are well documented in the literature. The aim of this article is to investigate whether lactation afects the trabecular and cortical bone structure of human mandible. Methods 120 dental panoramic radiographs (DPR) of the lactating women who were breastfeeding for 3–6 months (study group) and 120 DPRs of the nulliparous women (control group) were evaluated. Regions of interest (ROI) were chosen from the geometric center of ramus, the geometric center of angulus and the cortical bone. ROIs were examined with fractal analysis method. Fractal dimension . . . (FD) values of each ROI were compared with each other. In addition, the study group was divided into four subgroups according to age, and FD values were compared within the subgroups. Results The control and study groups were age-matched. FD values of mandibular ramus and angulus were signifcantly lower in the study group ( Daha fazlası Daha az

Nazire Nurdan ÇAKIR

Makale/Derleme | 2019 | Clin Oral Investig.

Objectives The aim of this study was to evaluate the 24-month clinical performance of universal adhesives on the restoration success of Class I carious lesions. Materials and methods Five different universal adhesives (Gluma Bond Universal (GU), Clearfil Universal (CU), Prime&Bond Elect Universal (PU), All bond Universal (AU), and Single Bond Universal (SU)) were used in the self-etch and etch-and-rinse modes in 42 patients. The study was conducted with 10 groups, with 20 restorations in each group. The restorations were evaluated at baseline and during a 24-month recall using World Dental Federation (FDI) and the US Public Health S . . .ervice (USPHS) criteria. The changes in the parameters were analyzed using the chi-square test. Results At the end of 24 months, there was no loss of restoration in any group. According to the USPHS, there was no difference in the baseline and 24-month clinical behavior of the restorations (P ˃ 0.05). However, according to the FDI, when adhesives were used in the self-etch mode, three adhesives (GU, SU, PU) showed marginal incompatibility, and one adhesive showed (GU) marginal discoloration between baseline and the 24-month follow-up evaluation (P Daha fazlası Daha az

Özcan KARATAŞ

Makale/Derleme | 2019 | Journal of Oral Science

The evaluation of the effect of bleaching on monomer release from two composite resins was performed by bleaching two nanohybrid composite resins Filtek Z550 and Tetric N-Ceram using two bleaching products Whiteness HP Maxx and Vivastyle. In total, 20 samples were made from each composite resin from which four groups were fabricated (two for each bleaching product). The samples were stored in a 75% ethanol solution, and the solutions were renewed after 1, 7, and 28 days. The monomer release was analyzed using high performance liquid chromatography. The data were analyzed using repeated measures analysis of variance and least signifi . . .cant difference multiple comparison test (α = 0.05). Monomers were found to be released from both composite resins. The amounts of monomer released were found to decrease over time (P < 0.05); however, the resins were not affected by bleaching, and the released monomers were well below toxic doses Daha fazlası Daha az

Şaban KARAYAĞIZ

Bildiri | 2019 | 11th International Congress on Psychopharmacology & 7th International Symposium on Child and Adolescent Psychopharmacology1 ( 29 ) , pp.5 - 6

Obsessive compulsive disorder (OCD) is a common, chronic, and long-term psychiatric disorder in which the individual feels uncontrollable, recurring thoughts (impulses) and an urge to repeat behaviors (coercion). It is a disorder with mental actions that cannot be prevented from repeating itself. Millions of people around the world suffer from OCD. According to 2017 data (World Health Organization), roughly 2,3% of any population live with this disorder. In the study, environmental factors including sociodemographic characteristics which are among the factors that cause OCD formation were examined. This study was intended to examine . . .the relationship between sociodemographic characteristics and OCD symptoms. Therefore, different types of obsessions and compulsions of the participants have been examined. METHODS:Datawerecollectedfrom62peopleintwomid-Anatoliancities.23(37%)weremale and 39 (63%) were female. Their ages ranged between 17–63 and average age was 32 years. 34 (55%) of them were married, 18 (39%) were single and remaining were separated. Sociodemographic data form, Diagnosis DSM-V, Global Obsessive-Compulsive Scale (OCI-R), and Yale Brown Scale (Y-BOCS) were used for data collection. They received a general psychiatric examination. RESULTS: The results showed that the most common obsessions were transmission and sexual suspicion. In addition, control, washing and questioning were found among the most common compulsions. Regarding the patients, 18 were first time, 29 were repetitive, and 15 were chronic OCD patients. Most common obsession types were found as suspicion, infection, and sexual. Their compulsions were mainly control, washing, avoiding or questioning. 40 of them (64%) indicated not having any internal health problem. Other patients were suffering from various internal health issues such as ophthalmologic problems, migraine, epilepsy, and hernia. The frequency of suffering internal health issues in females (46%) was found to be much higher than males (20%). However, no correlation was found between both genders. Most subjects (58%) reported having a relative person diagnosed with a mental issue especially OCD and depression. CONCLUSIONS: Preliminary results revealed that correlation coefficient between OCD symptoms and number of kids (-0.22) showed that the greater number of kids, the less OCD severity. It was found that age and OCD symptoms had negative correlation. On the other hand, similar to previous studies, OCD severity increases as age rises. Having close relatives with OCD symptoms proves that it has a genetic component. Suffering from any internal disease was another factor that increases the risk getting it. Our data comparing male and female subjects diagnosed with it resulted in inconclusive conclusion and supported previous studies. Finally, our findings correlated with the previous research findings and supported the OCD theories about its causes (biology, genetics and environments). However, more detailed and comprehensive studies should be conducted to get more sound proofs about it and related issues such its risk factors, gender and other features. Daha fazlası Daha az

Şaban KARAYAĞIZ

Bildiri | 2018 | yok29 ( 1 ) , pp.37 - 37

Bildiri

Onur GÖZBAŞI

Makale/Derleme | 2016 | Natural Hazards82 ( 2 ) , pp.1327 - 1340

The purpose of this paper was to investigate the validity of the environmentalKuznets curve (EKC) hypothesis for the period between 1977 and 2013 by using the sub-elements of carbon (CO2) emissions in China. To this end, the fully modified ordinary leastsquares and pairwise Granger causality methodologies have been employed. As a result, itis found that financial development leads to an improvement in environmental performancein China for many kinds of pollution, including the following: liquid fuel pollution, solidfuel pollution, residential buildings and commercial and public services pollution, andelectricity and heat production po . . .llution. The findings indicate that an increase in percapita consumption of energy will lead to an increase in eight different sub-elements of thecarbon emissions. The highest impact is for per capita CO2emissions and the lowestimpact is for liquid fuel CO2emissions. The findings also suggest that the EKC hypothesisis valid for CO2emissions from gaseous fuel consumption, liquid fuel consumption, solidfuel consumption and transportation. However, the EKC hypothesis is not valid foraggregate CO2emissions, CO2emissions from residential buildings and commercial andpublic services, from electricity and heat production and from manufacturing industriesand construction Daha fazlası Daha az

Onur GÖZBAŞI

Makale/Derleme | 2014 | Eonomic Modelling

This paper re-examines the efficient market hypothesis (EMH) in the Turkish stock market by utilizing the recent developments in nonlinear unit root tests. To this end, we first employ the linearity test developed by Harvey et al. (2008) and then carry out the nonlinear ESTAR unit root test recently developed by Kruse (2011). The results show that Borsa Istanbul stock price index series have nonlinear behavior and follow the random walk (non-stationary) process, supporting the EMH in Turkish stock market which has weak-form efficiency.

Ali Özen

Makale/Derleme | 2013 | Radioengineering Journal

A new variable step size (VSS) control technique employing cross correlation between channel output and error signal has been proposed as a solution to the problem of slow convergence of blind and non-blind equalization algorithms. The new method resolves the conflict between the convergence rate and low steady state error of the fixed step-size conventional blind and non-blind equalization algorithms, such as Constant Modulus Algorithm (CMA) and Least Mean Squares (LMS) algorithm. Computer simulations have been performed to verify the performance of the proposed method in frequency selective Rayleigh fading channels. The proposed t . . .echnique has been compared with the popular non-blind equalizers, LMS and Recursive Least Squares (RLS) algorithms, and blind equalizers, the conventional CMA, Zhao’s VSS-CMA and Demir’s VSS-CMA as benchmarks. The obtained simulation results have demonstrated that the proposed VSS-CMA and VSS-LMS algorithms have considerably better performance than the conventional CMA, Zhao’s VSS-CMA and Demir’s VSS-CMA blind equalization algorithms, and the conventional LMS non-blind equalization algorithm. Daha fazlası Daha az

Ali ÖZEN

Makale/Derleme | 2012 | Radioengineering Journal

A novel variable step size constant modulus algorithm (VSS-CMA) based on autocorrelation of error signal has been proposed to improve the weakness of previous VSSCMAs for application to blind equalization in this paper. Computer simulations have been performed to illustrate the performance of the proposed method in frequency selective Rayleigh fading channels. The obtained simulation results using WiMAX (IEEE 802.16-2004) radio standard have demonstrated that the proposed VSS-CMA algorithm has considerably better performance than conventional CMA, normalized CMA (NCMA) and the other VSS-CMA algorithms.

Ali Özen

Bildiri | 2019 | IEEE 42th International Conference on Telecommunications and Signal Processing, TSP 2019 , pp.660 - 663

In this paper, a new waveform design based on Lifting Wavelet Transform (LWT) is proposed for next generation wireless communication systems. The proposed waveform design (LWT-UFMC) consists of combination of the LWT and universal filtered multi carrier (UFMC) waveform. It is aimed to improve the performance of the UFMC waveform, which is from the 5th Generation (5G) waveform candidates, with the proposed LWT-UFMC waveform. Computer simulation studies are performed to test the achievement of the recommended waveform and to compare with the classical OFDM and UFMC in AWGN and flat Rayleigh fading channels. It is seen that the propose . . .d waveform from the obtained simulation results has the best and highly satisfactory performance. Daha fazlası Daha az

Ali Özen

Bildiri | 2019 | IEEE 42th International Conference on Telecommunications and Signal Processing, TSP 2019 , pp.651 - 654

In this paper, DT-CWT-OFDM waveform based on dual tree complex wavelet conversion (DT-CWT) is introduced to enhance the achievement of the classical OFDM waveform. IFFT/FFT blocks used in the classical OFDM waveform are replaced with IDTCWT/DTCWT blocks in the DT-CWT-OFDM waveform. In order to confirm the achievement of the investigated waveform and compare it with the waveforms of classical OFDM and discrete wavelet conversion based OFDM (DWT-OFDM), computer simulation studies are carried out on AWGN, flat Rayleigh damping and frequency-selective Rayleigh damping channels. It is seen from the attained simulation outcomes that the D . . .T-CWT-OFDM waveform has better achievement than the classical OFDM and DWT-OFDM waveforms and also provides approximately 6 dB SNR gain against the classical OFDM and approximately 1.5 dB SNR gain against the DWT-OFDM for a BER value of 1E-4 Daha fazlası Daha az