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- 저자 : Beyhan Yilmaz (검색결과 5 건)
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HARMONIC CURVATURE FUNCTIONS OF SOME SPECIAL CURVES IN GALILEAN 3-SPACE
Yilmaz, Beyhan,Metin, Seyma,Gok, Ismail,Yayli, Yusuf The Honam Mathematical Society 2019 호남수학학술지 Vol.41 No.2
The aim of the paper is to characterize some curves with the help of their harmonic curvature functions. First of all, we have defined harmonic curvature function of an arbitrary curve and have re-determined the position vectors of helices in terms of their harmonic curvature functions in Galilean 3-space. Then, we have investigated the relation between rectifying curves and Salkowski (or anti-Salkowski) curves in Galilean 3-space. Furthermore, the position vectors of them are obtained via the serial approach of the curves. Finally, we have given some illustrated examples of helices and rectifying curves with some assumptions.
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Harmonic curvature functions of some special curves in Galilean $3-$Space
Beyhan Yilmaz,Seyma Metin,Ismail Gok,Yusuf Yayli 호남수학회 2019 호남수학학술지 Vol.41 No.2
The aim of the paper is to characterize some curves with the help of their harmonic curvature functions. First of all, we have defined harmonic curvature function of an arbitrary curve and have re-determined the position vectors of helices in terms of their harmonic curvature functions in Galilean $3-$space. Then, we have investigated the relation between rectifying curves and Salkowski (or anti-Salkowski) curves in Galilean $3-$space. Furthermore, the position vectors of them are obtained via the serial approach of the curves. Finally, we have given some illustrated examples of helices and rectifying curves with some assumptions.
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DEDE SAGSOZ, Yesim,YILMAZ, Alper Erdem,EKMEKYAPAR TORUN, Fatma,KOCADAGISTAN, Beyhan,KUL, Sinan The Korean Electrochemical Society 2022 Journal of electrochemical science and technology Vol.13 No.2
In this study, electrochemical treatment of urban wastewater with electrical conductivity of 1000 μS cm<sup>-1</sup> and chemical oxygen demand of 250 mg L<sup>-1</sup> was investigated using the variables of initial pH value, current density and flow rate. Electrocoagulation was used, in which aluminum and stainless steel were selected, as the electrochemical treatment process. The electrocoagulation process was operated in continuous mode. The data obtained in experimental studies show that the best COD removal efficiency occurred in experiments where the initial pH value was 6. The increase in current density from 5 A to 15 A decreased the removal efficiency from 79 to 67%. The increase in flow rate under constant current density also reduced the efficiency of removal as expected. In experiments in which current density and flow rate were examined together, the increase in flow rate allowed the application of higher current densities. This situation led to considerable reductions in energy consumption values, even if the COD removal efficiency did not significantly increase. The high COD removal obtained with the use of high flow rate and high current density indicates that the electrocoagulation process can be used for high flow rate municipal wastewater treatment.
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Specimen index may be a predictive factor for recurrence after primary closure of pilonidal disease
Husnu Alptekin,Fahrettin Acar,Mustafa Sahin,Huseyin Yilmaz,M. Ertugrul Kafali,Sinan Beyhan 대한외과학회 2012 Annals of Surgical Treatment and Research(ASRT) Vol.83 No.6
Purpose: The aim of the present study was to evaluate the predictive value of volume of the specimen/body mass index (VS/BMI) ratio for recurrence after surgical therapy of pilonidal disease. Methods: Ninety-eight patients with primary pilonidal disease were enrolled in this study. The VS/BMI ratio was calculated for each patient. This ratio was defined as the specimen index (SI). VS, BMI and SI were evaluated to determine whether there is a relationship between these parameters and recurrence of pilonidal disease. In addition, the predictive ability of SI for recurrence was analyzed by receiver operating characteristic (ROC) curve. Results: VS and SI were found to be higher in patients with recurrence. ROC curve analysis showed that VS and SI are predictive factors for recurrence in patients treated with primary closure, nevertheless our new index had higher sensitivity and specificity than VS (sensitivity 85.7% vs 71.4% and specificity 90.7% vs 85.1%, respectively). The cut-off level for the greatest sensitivity and specificity for SI was 1.29. Conclusion: Recurrence is higher in patients with high VS regardless of the operation method. SI may be a predictive value in patients treated with primary closure.
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Ozgul Malcok Gürel,Muhammed Bora Demircelik,Mukadder Ayse Bilgic,Hakki Yilmaz,Omer Caglar Yilmaz,Muzaffer Cakmak,Beyhan Eryonucu 대한심장학회 2015 Korean Circulation Journal Vol.45 No.5
Background and Objectives: The red blood cell distribution width (RDW) has been found to be associated with cardiovascular morbidity and mortality. The objective of this study was to determine whether the RDW measures are associated with the coronary artery calcification score (CACS) in patients who did not present with obvious coronary heart disease (CHD). Subjects and Methods: A total of 527 consecutive patients with a low to intermediate risk for CHD but without obvious disease were enrolled in this study. The study subjects underwent coronary computerized tomography angiography and CACS was calculated. The patients were divided into two groups based on CACS: Group I (CACS≤100) and Group II (CACS>100). The two groups were compared in terms of classic CHD risk factors and haematological parameters, particularly the RDW. Results: Group I patients were younger than Group II patients. The Framingham risk score (FRS) in patients of Group II was significantly higher than that in patients of Group I. Group II patients had significantly elevated levels of haemoglobin, RDW, neutrophil count, and neutrophil/lymphocyte ratio compared with Group I patients. CACS was correlated with age, RDW, and ejection fraction. In the multivariate analysis, age, RDW, and FRS were independent predictors of CACS. Using the receiver-operating characteristic curve analysis, a RDW value of 13.05% was identified as the best cut-off for predicting the severity of CACS (>100) (area under the curve=0.706). Conclusion: We found that the RDW is an independent predictor of the CACS, suggesting that it might be a useful marker for predicting CAD.
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