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Homology of contact CR-warped product submanifolds of an odd-dimensional unit sphere
Bayram \c{S}ahin,Fulya \c{S}ahin 대한수학회 2015 대한수학회보 Vol.52 No.1
We show that homology group on a contact CR-warped product submanifold in odd dimensional sphere is zero under certain conditions in terms of warping function and the dimension of the submanifold.
Monte Carlo analysis of LWR spent fuel transmutation in a fusion-fi ssion hybrid reactor system
Sümer S¸ ahi_n,Hacı Mehmet S¸ ahin,Güven Tunç 한국원자력학회 2018 Nuclear Engineering and Technology Vol.50 No.8
The aim of this paper is to determine neutronic performances of the light water reactor (LWR) spent fuelmixed with fertile thorium fuel in a FFHR. Time dependent three dimensional calculations for majortechnical data, such as blanket energy multiplication, tritium breeding ratio, cumulative fissile fuelenrichment and burnup have been performed by using Monte Carlo Neutron-Particle Transport codeMCNP5 1.4, coupled with a novel interface code MCNPAS, which is developed by our research group. Aself-sustaining tritium breeding ratio (TBR>1.05) has been kept throughout the calculations. The studyhas shown that the fissile fuel quality will be improved in the course of the transmutation of the LWRspent in the FFHR. The latter has gained the reusable fuel enrichment level conventional LWRs betweenone and two years. Furthermore, LWR spent fuel - thorium mixture provides higher burn-up values thanin light water reactors.
Assessment of the Seismic Performance of a Historical Building Reinforced with Steel Buttress
Şahin Sözen,Murat Çavuş 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.7
Steel buttresses are sometimes used to reinforce historical structures to secure them against seismic loading. However, the interaction between two structures made of different materials and in different geometrical arrangements can be controversial due to different dynamical behavior. In this study, possible interaction between the historical structure and the buttresses built to support the existing structure was examined. In this scope, the prototype model taken from a certain part of a historical building was modeled with and without buttress and analyzed in the SAP 2000 structural analysis program. Time history analyzes were performed by using the acceleration records of Düzce earthquake. The results of the analysis were evaluated and the function of the steel buttresses was investigated via displacement and stress values and their distributions. According to the analysis results, it was found that the contribution of steel buttresses to the existing structure was largely confined when considering earthquake effects.
Berkan S¸ ahin,Koray Karabekiroğlu,Abdullah Bozkurt,Miraç Barıs¸ Usta,Muazzez Aydın,Cansu Çobanoğlu 대한신경정신의학회 2018 PSYCHIATRY INVESTIGATION Vol.15 No.12
Objective One of the areas of social cognition is Theory of Mind (ToM) is defined as the capacity to interpret, infer and explain mental states underlying the behavior of others. When social cognition studies on neurodevelopmental disorders are examined, it can be seen that this skill has not been studied sufficiently in children with Specific Learning Disorder (SLD). Methods In this study, social cognition skills in children diagnosed with attention deficit hyperactivity disorder (ADHD), SLD or Autism Spectrum Disorder (ASD) evaluated before puberty and compared with controls. To evaluate the ToM skills, the first and secondorder false belief tasks, the Hinting Task, the Faux Pas Test and the Reading the Mind in the Eyes Task were used. Results We found that children with neurodevelopmental disorders as ADHD, ASD, and SLD had ToM deficits independent of intelligence and language development. There was a significant correlation between social cognition deficits and problems experienced in many areas such as social communication and interaction, attention, behavior, and learning. Conclusion Social cognition is an important area of impairment in SLD and there is a strong relationship between clinical symptoms and impaired functionality.
Ebru Çopuroğlu,Şahin Sözen,Ali Yamçıçıer 한국강구조학회 2017 International Journal of Steel Structures Vol.17 No.2
A new analytical approximation to the evaluation of temperature dependence of heat capacity of some alloy steels has been presented in this study. This method is based on the Debye approximation for the heat capacity of solids. The proposed analytical method is general and can be applied to the various alloy steels. As an application of method the calculations have been performed for Fe-18Cr-12Ni-2Mo and Fe-18Cr-16Ni-10Mn stainless steels. It is seen from the comparisons of our results with other studies that our approach is accurate.
Increased Bladder Wall Thickness in Diabetic and Nondiabetic Women With Overactive Bladder
Hakkı Uzun,Sabri Ogullar,Serap Baydur Şahin,Orhan Ünal Zorba,Görkem Akça,Fatih Sümer,Ülkü Mete Güney,Gülşah Balık 대한배뇨장애요실금학회 2013 International Neurourology Journal Vol.17 No.2
Purpose: Bladder wall thickness has been reported to be associated with overactive bladder (OAB) in women. Diabetic women have an increased risk for OAB syndrome and may have an increased risk for bladder wall thickness. Methods: A total of 235 female patients aged 40 to 75 years were categorized into four groups. The first group consisted of women free of urgency or urge urinary incontinence. The second group included nondiabetic women with idiopathic OAB. The third group consisted of women with diabetes and clinical OAB, and women with diabetes but without OAB constituted the fourth group. Bladder wall thickness at the anterior wall was measured by ultrasound by the suprapubic approach with bladder filling over 250 mL. Results: The diabetic (third group) and nondiabetic (second group) women with OAB had significantly greater bladder wall thickness at the anterior bladder wall than did the controls. However, the difference was not significant between the diabetic (third group) and the nondiabetic (second group) women with OAB. Women with diabetes but without OAB (fourth group) had greater bladder wall thickness than did the controls but this difference was not significant. Additionally, the difference in bladder wall thickness between diabetic women with (third group) and without (fourth group) OAB was not significant. Conclusions: This is the first study to show that bladder wall thickness is increased in diabetic women with and without OAB. Additionally, nondiabetic women with OAB had increased bladder wall thickness. Further studies may provide additional information for diabetic and nondiabetic women with OAB, in whom the etiopathogenesis of the disease may be similar.
Omer S¸ahin,Cafer Saka,Sinan Kutluay 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.5
Almond shell based adsorbents were thermally modified by cold plasma and microwave radiation for improving adsorption ability of Eriochrome Black T. The maximum adsorption capacities were 6.02,18.18, and 29.41 mg/g for untreated, cold plasma and microwave radiation treated almond shell,respectively. The removal percentages of EBT compared with untreated almond shell were increased from 39.96% to 81.46% and 84.31% after modification by cold plasma and microwave radiation treatments, respectively. SEM, FT-IR spectroscopy and point of zero charge measurement were applied to analysis the almond shell surface. Data on equilibrium were evaluated by using Langmuir and Freundlich models.