oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Search Results: 1 - 10 of 733 matches for " Umut Mutlu Özkan "
All listed articles are free for downloading (OA Articles)
Page 1 /733
Display every page Item
Oscillation of Higher-Order of System of Difference Equations with Continuous Arguments
zkan ?calan,Umut Mutluzkan
Sel?uk Journal of Applied Mathematics , 2008,
Abstract: This paper is concerned with the oscillatory behavior of all solutions of the higher-order of system of difference equations with continuous arguments _{τ} y(t)+∑_{i=1}^{m}P_{i}y(t-σ_{i})=0where P_{i}∈ ^{s×s} and τ,σ_{i}∈ for i=1,2,…,m, and _{τ} is a backward difference operator, defined by _{τ}y(t) =y(t)-y(t-τ).
Fractional Quantum Integral Inequalities
Hasan Öğünmez,Umut Mutlu Özkan
Journal of Inequalities and Applications , 2011, DOI: 10.1155/2011/787939
Abstract:
Steffensen's Integral Inequality on Time Scales
Umut Mutlu Ozkan,Hüseyin Yildirim
Journal of Inequalities and Applications , 2007, DOI: 10.1155/2007/46524
Abstract: We establish generalizations of Steffensen's integral inequality on time scales via the diamond- ± dynamic integral, which is defined as a linear combination of the delta and nabla integrals.
Steffensen's Integral Inequality on Time Scales
Ozkan Umut Mutlu,Yildirim Hüseyin
Journal of Inequalities and Applications , 2007,
Abstract: We establish generalizations of Steffensen's integral inequality on time scales via the diamond- dynamic integral, which is defined as a linear combination of the delta and nabla integrals.
Gaussian Mixture Reduction Using Reverse Kullback-Leibler Divergence
Tohid Ardeshiri,Umut Orguner,Emre ?zkan
Computer Science , 2015,
Abstract: We propose a greedy mixture reduction algorithm which is capable of pruning mixture components as well as merging them based on the Kullback-Leibler divergence (KLD). The algorithm is distinct from the well-known Runnalls' KLD based method since it is not restricted to merging operations. The capability of pruning (in addition to merging) gives the algorithm the ability of preserving the peaks of the original mixture during the reduction. Analytical approximations are derived to circumvent the computational intractability of the KLD which results in a computationally efficient method. The proposed algorithm is compared with Runnalls' and Williams' methods in two numerical examples, using both simulated and real world data. The results indicate that the performance and computational complexity of the proposed approach make it an efficient alternative to existing mixture reduction methods.
Local Estimation of Riesz-type Potential Operator on Weighted Spaces of Summation Functions
Hüseyin Y?ld?r?m,Umut Mutlu Ozkan
Sel?uk Journal of Applied Mathematics , 2004,
Abstract: In this work, after defining and obtaining the fractional integrals generated by the Riesz-type potentials, their local estimations are stated.
Approximate Bayesian Smoothing with Unknown Process and Measurement Noise Covariances
Tohid Ardeshiri,Emre ?zkan,Umut Orguner,Fredrik Gustafsson
Computer Science , 2014,
Abstract: We present an adaptive smoother for linear state-space models with unknown process and measurement noise covariances. The proposed method utilizes the variational Bayes technique to perform approximate inference. The resulting smoother is computationally efficient, easy to implement, and can be applied to high dimensional linear systems. The performance of the algorithm is illustrated on a target tracking example.
On Multilinear Fractional Integrals Generated by the Quasi-distance
Hüseyin Y?ld?r?m,Mehmet Zeki Sar?kaya,Umut Mutlu Ozkan
Sel?uk Journal of Applied Mathematics , 2007,
Abstract: In R , we prove L^{p }×...×L^{p_{k}} boundedness for the multilinear fractional integrals generated by the quasi-distanceI_{α,λ,v}(f ,...,f_{k})(x)=∫f (x-θ y)f (x-θ y)...f_{k}(x-θ_{k}y)‖y‖_{λ,v}^{α-n}dywhere the θ_{j}'s are nonzero and distinct. We also prove multilinear versions of two inequalities for fractional integrals and a multilinear Lebesgue differentiation theorem.
Effects of air-polishing powders on color stability of composite resins
Güler, Ahmet Umut;Duran, Ibrahim;Yücel, Ali ?a?in;?zkan, Pelin;
Journal of Applied Oral Science , 2011, DOI: 10.1590/S1678-77572011005000021
Abstract: objectives: the purpose of this study was to investigate the effect of different air-polishing powders on the color stability of different types of composite resin restorative materials. material and methods: thirty cylindrical specimens (15×2 mm) were prepared for each of 7 composite resin restorative materials. all specimens were polished with a series of aluminum oxide polishing discs (sof-lex). the prepared specimens of each composite resin were randomly divided into 3 groups of 10 specimens each, for control (group-c) and two air-powder applications (group-cp: cavitron prophy-jet; group-ps: sirona prosmile prophylaxis powder). a standard air-polishing unit (prosmile handly) was used. all specimens were air-powdered for 10 s at 4-bar pressure. the distance of the spray nosel from the specimens was approximately 10 mm and angulation of the nosel was 90°. specimens were stored in 100 ml of coffee (nescafe classic) for 24 h at 37°c. color measurement of all specimens was recorded before and after exposure to staining agent with a colorimeter (minolta cr-300). color differences (?e*) between the 2 color measurements (baseline and after 24 h storage) were calculated. the data were analyzed with a 2-way anova test, and mean values were compared by the tukey hsd test (p<0.05). results: according to the 2-way anova results, composite resin restorative materials, air-polishing powders, and their interaction were statistically significant (p<0.05) for aelite aesthetic enemal, filtek z250, grandio, ceramx mono, and quixfil composite resin restorative materials, no significant difference was observed between group-ps and group-cp (p>.05) and these groups demonstrated the highest ?e* values. for filtek silorane and intens, the highest ?e* values were observed in group-ps. the lowest ?e* values for all composite resin groups were observed in group-c. when comparing the 7 composite resin restorative materials, aelite aesthetic enemal demonstrated significantly less ?e* values
Effects of air-polishing powders on color stability of composite resins
Ahmet Umut Güler,Ibrahim Duran,Ali ?a?in Yücel,Pelin ?zkan
Journal of Applied Oral Science , 2011,
Abstract: OBJECTIVES: The purpose of this study was to investigate the effect of different air-polishing powders on the color stability of different types of composite resin restorative materials. MATERIAL AND METHODS: Thirty cylindrical specimens (15×2 mm) were prepared for each of 7 composite resin restorative materials. All specimens were polished with a series of aluminum oxide polishing discs (Sof-Lex). The prepared specimens of each composite resin were randomly divided into 3 groups of 10 specimens each, for control (Group-C) and two air-powder applications (Group-CP: Cavitron Prophy-Jet; Group-PS: Sirona ProSmile prophylaxis powder). A standard air-polishing unit (ProSmile Handly) was used. All specimens were air-powdered for 10 s at 4-bar pressure. The distance of the spray nosel from the specimens was approximately 10 mm and angulation of the nosel was 90°. Specimens were stored in 100 mL of coffee (Nescafe Classic) for 24 h at 37°C. Color measurement of all specimens was recorded before and after exposure to staining agent with a colorimeter (Minolta CR-300). Color differences ( E*) between the 2 color measurements (baseline and after 24 h storage) were calculated. The data were analyzed with a 2-way ANOVA test, and mean values were compared by the Tukey HSD test (p<0.05). RESULTS: According to the 2-way ANOVA results, composite resin restorative materials, air-polishing powders, and their interaction were statistically significant (p<0.05) For Aelite Aesthetic Enemal, Filtek Z250, Grandio, CeramX Mono, and Quixfil composite resin restorative materials, no significant difference was observed between Group-PS and Group-CP (p>.05) and these groups demonstrated the highest E* values. For Filtek Silorane and IntenS, the highest E* values were observed in Group-PS. The lowest E* values for all composite resin groups were observed in Group-C. When comparing the 7 composite resin restorative materials, Aelite Aesthetic Enemal demonstrated significantly less E* values than the other composite resins tested. The highest E* values were observed in Quixfil. CONCLUSION: Except for Quixfil, all control groups of composite resins that were polished Sof-Lex exhibited clinically acceptable E values (<3.7). Air-polishing applications increased the color change for all composite resin restorative materials tested. Composite restorations may require re-polishing after air-polishing.
Page 1 /733
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.