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Seiberg-Witten-like equations on the strictly pseudoconvex $CR$-3 manifolds
Serhan Eker 대한수학회 2019 대한수학회보 Vol.56 No.6
In this paper, Seiberg-Witten-like equations are written down on $3$-manifolds. Then, it has been proved that the $L^{2}$-solutions of these equations are trivial on $\mathbb{R}^3$. Finally, a global solution is obtained on the strictly pseudoconvex $CR$-3 manifolds for a given constant negative scalar curvature.
Serhan Haner 한양대학교 세라믹연구소 2020 Journal of Ceramic Processing Research Vol.21 No.6
In this study, the effect of specific rates of breakage of nefelinli siyenit, which is a magmatic, feldspathic rock, on technologicalproperties of ceramic bodies is examined. The ceramic material properties considered in this study derived from theapplication of non-destructive and destructive tests and include firing shrinkage, water absorption, mercury porosimeter andfiring strength, while the specific rate of breakage (Si) determined from batch grinding tests. In order to Si values, in the rangeof -63+53 μm mono-size fraction was prepared. The nepheline syenite prepared in these interval were ground with 1/4, 5/16,3/8, 1/2 and 3/4 inches alloy steel balls for different durations. The results indicate that the technological properties of ceramicmaterials examined show very good correlation and can be used to predict Si. Overall, it is deduced that multiple regressionanalysis involving two independent variables is a reliable approach and can be used to identify correlations betweentechnological properties of ceramic materials and specific rate of breakage values for nepheline syenite.
Parotid Gland Tumours in Turkish Population: Analysis of 165 Patients
Derin, Serhan,Erdogan, Selvet,Almac, Ahmet,Ulubil, Arif,Iseri, Mete,Aydin, Omer,Keskin, I Gurkan,Oran, Abdulkadir,Kuru, Fatma Demir Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.8
Background: Retrospective data on 165 patients who presented with a parotid mass and underwent surgery in our clinics during 2000-2009 were examined. The obtained data (demographic data, surgical procedures, histopathological diagnoses) were compared to similar studies to make contributions to the literature. Materials and Methods: Patients were classified according to their histopathological diagnosis. Surgical procedures and patient follow-up were clarified. The results are presented as means and standard deviations. Results: Of the 165 masses, 134 (81.3%) were benign and 31 (18.7%) were malignant. Pleomorphic adenoma was the most common benign tumour (79 patients, 59%). Lymphoma and adenoid cystic carcinoma were equally common and were the most common malignant parotid gland tumours (both 6 patients, 19.3%). The most frequent surgical procedure was superficial parotidectomy (92 patients, 55.7%), and the most commonly encountered surgical complication was facial paralysis (12 patients, 7.2%). Conclusions: Our data are generally in line with the literature but lymphoma was more common than in most previous reports. Although the number of cases was low, the high incidence of parotid gland lymphoma was remarkable.
Derici, Serhan,Sevinc, Ali,Harmancioglu, Omer,Saydam, Serdar,Kocdor, Mehmet,Aksoy, Suleyman,Egeli, Tufan,Canda, Tulay,Ellidokuz, Hulya,Derici, Solen Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.12
Background: The aim of the study was to evaluate the available breast nomograms (MSKCC, Stanford, Tenon) to predict non-sentinel lymph node metastasis (NSLNM) and to determine variables for NSLNM in SLN positive breast cancer patients in our population. Materials and Methods: We retrospectively reviewed 170 patients who underwent completion axillary lymph node dissection between Jul 2008 and Aug 2010 in our hospital. We validated three nomograms (MSKCC, Stanford, Tenon). The likelihood of having positive NSLNM based on various factors was evaluated by use of univariate analysis. Stepwise multivariate analysis was applied to estimate a predictive model for NSLNM. Four factors were found to contribute significantly to the logistic regression model, allowing design of a new formula to predict non-sentinel lymph node metastasis. The AUCs of the ROCs were used to describe the performance of the diagnostic value of MSKCC, Stanford, Tenon nomograms and our new nomogram. Results: After stepwise multiple logistic regression analysis, multifocality, proportion of positive SLN to total SLN, LVI, SLN extracapsular extention were found to be statistically significant. AUC results were MSKCC: 0.713/Tenon: 0.671/Stanford: 0.534/DEU: 0.814. Conclusions: The MSKCC nomogram proved to be a good discriminator of NSLN metastasis in SLN positive BC patients for our population. Stanford and Tenon nomograms were not as predictive of NSLN metastasis. Our newly created formula was the best prediction tool for discriminate of NSLN metastasis in SLN positive BC patients for our population. We recommend that nomograms be validated before use in specific populations, and more than one validated nomogram may be used together while consulting patients.
SEIBERG-WITTEN-LIKE EQUATIONS ON THE STRICTLY PSEUDOCONVEX CR-3 MANIFOLDS
Eker, Serhan Korean Mathematical Society 2019 대한수학회보 Vol.56 No.6
In this paper, Seiberg-Witten-like equations are written down on 3-manifolds. Then, it has been proved that the $L^2$-solutions of these equations are trivial on ${\mathbb{R}}^3$. Finally, a global solution is obtained on the strictly pseudoconvex CR-3 manifolds for a given constant negative scalar curvature.
A unified formulation for static behavior of nonlocal curved beams
Ekrem Tufekci,Serhan A. Aya,Olcay Oldac 국제구조공학회 2016 Structural Engineering and Mechanics, An Int'l Jou Vol.59 No.3
Nanobeams are widely used as a structural element for nanodevices and nanomachines. The development of nano-sized machines depends on proper understanding of mechanical behavior of these nano-sized beam elements. Small length scales such as lattice spacing between atoms, surface properties, grain size etc. are need to be considered when applying any classical continuum model. In this study, Eringen’s nonlocal elasticity theory is incorporated into classical beam model considering the effects of axial extension and the shear deformation to capture unique static behavior of the nanobeams under continuum mechanics theory. The governing differential equations are obtained for curved beams and solved exactly by using the initial value method. Circular uniform beam with concentrated loads are considered. The displacements, slopes and the stress resultants are obtained analytically. A detailed parametric study is conducted to examine the effect of the nonlocal parameter, mechanical loadings, opening angle, boundary conditions, and slenderness ratio on the static behavior of the nanobeam.
Direct displacement-based seismic assessment of concrete frames
Chu Peng,Serhan Guner 사단법인 한국계산역학회 2018 Computers and Concrete, An International Journal Vol.21 No.4
Five previously-tested reinforced concrete frames were modelled using a nonlinear finite element analysis procedure to demonstrate the accurate response simulations for seismically-deficient frames through pushover analyses. The load capacities, story drifts, and failure modes were simulated. This procedure accounts for the effects of shear failures and the shearaxial force interaction, and thus is suitable for modeling seismically-deficient frames. It is demonstrated that a comprehensive analysis method with a capability of simulating material constitutive response and significant second-order mechanisms is essential in achieving a satisfactory response simulation. It is further shown that such analysis methods are invaluable in determining the expected seismic response, safety, and failure mode of the frame structures for a performance-based seismic evaluation. In addition, a new computer program was developed to aid researchers and engineers in the direct displacementbased seismic design process by assessing whether a frame structure meets the code-based performance requirements by analyzing the analysis results. As such, the proposed procedure facilitates the performance-based design of new buildings as well as the numerical assessment and retrofit design of existing buildings. A sample frame analysis was presented to demonstrate the application and verification of the approach.
Thermodynamic Analysis of an Auto-Cascade Freezer Cycle at Different Loads of Evaporators
Atamtürk Ayça,Küçüka Serhan 대한설비공학회 2021 International Journal Of Air-Conditioning and Refr Vol.29 No.3
In this study, a modified auto-cascade refrigerating cycle is proposed. The cycle includes two evaporators and one compressor, and a separator is located after the refrigerator evaporator. The vapor phase from the separator is condensed through an internal evaporator and is mixed with some amount of the liquid phase taken from the separator. The condensed liquid is sent to the freezer evaporator at low pressure. Thermodynamic properties of the mixture R290/R600a, which is a zeotropic mixture as a cycle fluid, were determined using the REFPROP database. The variation of the cycle performance and total cooling capacity is investigated by changing the ratios of refrigerator and freezer loads. The results show that the volumetric cooling capacity increases and the compressor pressure ratio decreases as the load ratio of the refrigerator increases.