Mühendislik ve Mimarlık Fakültesi
https://hdl.handle.net/20.500.12294/414
Faculty of Engineering and ArchitectureThu, 27 Jun 2019 00:23:09 GMT2019-06-27T00:23:09ZAmplitude analysis and branching fraction measurement of D-0 -> K-pi(+)pi(0)pi(0)
https://hdl.handle.net/20.500.12294/1502
Amplitude analysis and branching fraction measurement of D-0 -> K-pi(+)pi(0)pi(0)
Kolcu, Onur Buğra
Utilizing the dataset corresponding to an integrated luminosity of 2.93 fb(-1) at root s = 3.773 GeV collected by the BESIII detector, we report the first amplitude analysis and branching fraction measurement of the D-0 -> K- pi(+)pi(0)pi(0) decay. We investigate the substructures and determine the relative fractions and the phases among the different intermediate processes. Our results are used to provide an accurate detection efficiency and allow measurement of B(D-0 -> K- pi(+)pi(0)pi(0)) = (8.86 +/- 0.13(stat) +/- 0.19(syst))%.
Kolcu, Onur Buğra (Arel Author)
Tue, 01 Jan 2019 00:00:00 GMThttps://hdl.handle.net/20.500.12294/15022019-01-01T00:00:00ZSearch for heavy Majorana neutrino in lepton number violating decays of D -> K pi e(+)e(+)
https://hdl.handle.net/20.500.12294/1501
Search for heavy Majorana neutrino in lepton number violating decays of D -> K pi e(+)e(+)
Kolcu, Onur Buğra
Using a data sample with an integrated luminosity of 2.93 fb(-1) taken at the center-of-mass energy of 3.773 GeV, we search for the Majorana neutrino (nu(m)) in the lepton number violating decays D -> K pi e(+)e(+). No significant signal is observed, and the upper limits on the branching fraction at the 90% confidence level are set to be B(D degrees -> K-pi(-)e(+)e(+)) < 2.8 x 10(-6) , B(D+ -> K-S(0)pi(-) e(+)) < 3.3 x 10(-6) and B(D+ -> K-pi(0)e(+)e(+)) < 85 x 10(-6). The Majorana neutrino is searched for with different mass assumptions ranging from 0.25 to 1.0 GeV/c(2) in the decays D-0 -> K(-)e(+)nu(m),nu(m )-> pi(-)e(+) and D+ -> K(S)(0)e(+)nu(m),nu(m )->( )pi(-)e(+),and the upper limits on the branching fraction at the 90% confidence level are at the level of 10(-7) similar to 10(-6), depending on the mass of the Majorana neutrino. The constraints on the mixing matrix element vertical bar V-e nu m vertical bar(2) are also evaluated.
Kolcu, Onur Buğra (Arel Author)
Tue, 01 Jan 2019 00:00:00 GMThttps://hdl.handle.net/20.500.12294/15012019-01-01T00:00:00ZAutomated computer-aided diagnosis of splenic lesions due to abdominal trauma
https://hdl.handle.net/20.500.12294/1500
Automated computer-aided diagnosis of splenic lesions due to abdominal trauma
Teomete, U.; Tulum, Gökalp; Ergin, T.; Cüce, F.; Köksal, M.; Dandin, O.; Osman, Onur
Background: Computer-aided detection in the setting of trauma presents unique challenges due to variations in shape and attenuation of the injured organs based on the timing and severity of the injury. We developed and validated an automated computer-aided diagnosis algorithm to detect splenic lesions such as laceration, contusion, subcapsular hematoma, perisplenic hematoma, and active extravasation using computed tomography (CT) images in patients sustaining blunt or penetrating abdominal trauma. Methods: We categorized the splenic pathologies into three groups: contusion/laceration, hematoma, and active extravasation. We first analyzed the spleen and perisplenic region by estimating the mean value and standard deviation of the spleen. We determined adaptive threshold values based on the histogram of the area and detected the lesions after morphological operations and volumetric comparisons. Results: The overall performance of the three computer-aided diagnosis (CAD) algorithms is an accuracy of 0.80, sensitivity of 0.95, specificity of 0.67, and a diagnostic odds ratio (DOR) of 40 with a 95 % confidence interval (CI): 14 to 117. The CAD of perisplenic hematoma had the highest diagnosis rates with an accuracy of 0.90, a sensitivity of 0.95, specificity of 0.80, and DOR of 76 with a 95 % CI: 13 to 442. Conclusions: We developed a new algorithm to detect post-traumatic splenic lesions automatically and with high accuracy. Our method could potentially lead to the automated diagnosis of all traumatic abdominal pathologies.
Tulum, Gökalp (Arel Author), Osman, Onur (Arel Author)
Tue, 01 Jan 2019 00:00:00 GMThttps://hdl.handle.net/20.500.12294/15002019-01-01T00:00:00ZCorrelation of earthquake intensity measures and spectral displacement demands in building type structures
https://hdl.handle.net/20.500.12294/1497
Correlation of earthquake intensity measures and spectral displacement demands in building type structures
Palancı, Mehmet; Şenel, Sevket Murat
Seismic damage and its correlation with the earthquake intensity measures (IMs) are important for both record selection and probabilistic seismic risk assessment studies. A lot of studies considering the various structural properties were performed to investigate the correlations of mainly PGA and PGV under different strength reduction (R) and ductility factors (mu). In this study, correlation of many scalar IMs named as PGA, PGV, a(rms), v(rms), d(rms), I-a, CAV, ASI, SI are studied. Building represented by single degree of freedom (SDOF) models were classified according to lateral strength ratios (V-t/W), ratio of strength capacity at yield (V-t) to seismic weight (W), varying from 10% to 50%. Effects of post yield stiffness capacities, hysteretic behavior type and the soil properties on deformation demand of SDOF models are also taken into account. Post yield stiffness ratios of 0%, 5% and 10% considered and assigned to building models. Elastic-perfectly plastic and modified Clough hysteretic models were used in the non-linear dynamic analyses. Strong motion records obtained from firm and soft soil sites were classified according to V-s(30) and inelastic deformation demands obtained from both soil conditions are calculated and compared. Variation of correlation coefficients of different IMs indicates that SI is the best earthquake parameter especially along the period range of 0.5-2 s which can be thought to represent building type structures. Furthermore, it was observed that sensitivity of SI parameter to post yield stiffness, hysteretic behavior type and the soil properties is very limited with respect to considered IMs. Correlation coefficients obtained from SDOF models are compared to that of multi-story buildings and the compatibility of both SDOF and MDOF models are presented.
Palancı, Mehmet (Arel Author)
Tue, 01 Jan 2019 00:00:00 GMThttps://hdl.handle.net/20.500.12294/14972019-01-01T00:00:00Z