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

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.

Burcu ORALHAN

Makale/Derleme | 2018 | Iranian Journal of Public Health

Background: This study aimed to determine risk factors that occurrence time of traffic accidents. Traffic accident occurrence time is defined as the time between a driver’s getting his/her license and having the first accident, involving death or injury between 2008-2012 and there were investigated. Methods: This study was conducted with the Cox Regression and life tables models included among survival analysis models. Data of all 11.671 traffic accidents in Kayseri in Turkey were analyzed for the 5-yr period. Results: The non-occurrence rate of traffic accidents involving injury is mostly affected by gender, age, education, number . . .of vehicles involved in accident, road surface material, daylight, type of road, direction of road and time of the day. The non-occurrence rate of fatal traffic accident duration is mostly affected by gender, age, education, daylight and horizontal alignment. The rate of having an accident involving death or injury after getting driver's license is 30.3% in the first 5 yr, it is 50.1% in the first 10 yr and 91.7% in 25 yr. Conclusion: As the non-occurrence time increases, occurrence of accidents in earlier years will decrease. In other words, the number of accidents in earlier years will be lower. This will cause a decrease in the number of accidents in total Daha fazlası Daha az

Burcu ORALHAN

Makale/Derleme | 2018 | Mathematical Problems in Engineering.

In urban planning, housing evaluation of residential areas plays a critical role in promoting economic efciency.Tis study produced an evolutionary-based map through the combination of hybrid Multicriteria Decision Making (MCDM) and Geographical Information System (GIS) by assessing suitability of housing location. Suitable locations were modelled and determined with the present study from very low suitability to very high suitability. In the frst stage, Fuzzy DEMATEL (the Decision Making Trial and Evaluation Laboratory) and Covariance Matrix Adaptation Evolutionary Strategy (CMA-ES) under fuzzy conditions as a subjective and an obje . . .ctive (model-based) technique, respectively, were employed to fnd the weights of criteria which are critical part of decision making. In the second stage, housing evaluation map for these two approaches was drawn and their performances were classifed and measured with WLC (Weighted Linear Combination) method. 29 criteria determined were prioritized as per judgment of urban planning and real estate experts for Fuzzy DEMATEL and CMA-ES. Afer having been coded to MATLAB for obtaining optimum weights in CMA-ES, all collected data for 160 houses were mapped as vectorial (positional) and transformed to raster (pixel) data by getting entered in ArcGIS 10.4 sofware. We achieved CMA-ES-WLC maximization values for 104 alternatives with (positive value) 65% performance, but we obtained FDEMATEL-WLC maximization values for 56 alternatives with (negative value) 35% performance. WLC values calculated with CMA-ES and FDEMATEL weights allowed us to conclude that the houses with the highest suitability in terms of investment are in Alpaslan, K¨os¸k, and Melikgazi streets. Te result shows that the methodology used in the application of this study performed in Turkey is an important and powerful technology in providing decision support for spatial planning Daha fazlası Daha az

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.

Asuman SAVAŞÇIHABEŞ

Makale/Derleme | 2016 | Turkish Journal of Biochemistry

Objective: The expressions of leptin and its receptor (ObR) have been observed in human gastric cancer (GC) tissue. Leptin can promote the proliferation of GC cells. However, the correlation between leptin and ObR expressions in GC and the role of gastric ObR protein levels in patients with GC is still unclear. This study aimed to evaluate the relationship between leptin, gastric ObR protein and soluble leptin receptor (sObR) levels and whether their possible role of indicator in GC. Methods: Serum leptin, gastric leptin and serum sObR concentrations were determined in 30 male patients with GC and 25 male dyspeptic subjects by enzym . . .e linked immunosorbent assay. We analysed the expression of gastric ObR levels in endoscopically obtained biopsy samples by using Western Blotting method. Results: Compared with controls, patients had lower serum leptin and higher gastric tissue leptin levels. sObR protein concentrations of patients were detected significantly higher, gastric ObR protein expression were lower than subjects in control group. Conclusion: Leptin in gastric cancerous region and sObR in circulation are overexpressed in GC. Their expressions are associated with malignancy. Decreased leptin levels, induces the sObR signal in circulation. This negative feedback regulation is also seen in gastric tissue: increased gastric tissue leptin levels inhibits gastric ObR protein expression. Thus,leptin and ObR may be important indicators in GC Daha fazlası Daha az

Asuman SAVAŞÇIHABEŞ

Makale/Derleme | 2015 | Radioengineering Journal

The support of high spectral efficiency MIMO spatial-multiplexing communication in OFDM-based WLAN systems conforming to IEEE 802.11n standard requires the design and use of compact antennas and arrays with low correlation ports. For this purpose, compact space-multimode diversity provisioning stacked circular multimode microstrip patch antenna arrays (SCP-ULA) are proposed in this paper and their performance in terms of spatial and modal correlations, ergodic spectral efficiencies as well as compactness with respect to antenna arrays formed of vertically-oriented center-fed dipole elements (DP-ULA) and dominantmode operating circul . . .ar microstrip patch antennas (CPULA) are presented. The lower spatial and modal correlations and the consequent higher spectral efficiency of SCP-ULA with ML detection over statistically-clustered Kronecker-based spatially-correlated NLOS Ricean fading channels with respect to DP-ULA and CPULA at significantly lower antenna and array sizes represents SCP-ULA as a promising solution for deployment in terminals, modems and access points of next-generation high-speed 802.11n MIMO-OFDM WLAN systems. Daha fazlası Daha az