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- 저자 : Erdem Öztürk (검색결과 5 건)
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Optimum design of partially prestressed concrete beams using Genetic Algorithms
Erdem Türkeli,Hasan Tahsin Öztürk 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.64 No.5
This paper deals with the optimum cost design of partially prestressed concrete I crosssectioned beams by using Genetic Algorithms. For this purpose, the optimum cost design of two selected example problems that have different characteristics in behavior are performed via Genetic Algorithms by determining their objective functions, design variables and constraints. The results obtained from the technical literature are compared with the ones obtained from this study. The interpretation of the results show that the design of partially prestressed concrete I crossectioned beams from cost point of view by using Genetic Algorithms is 35~50 % more economical than the traditional ones (technical literature) without conceding safety.
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Hasan Tahsin Öztürk,Erdem Turkeli,Ahmet Durmus 사단법인 한국계산역학회 2016 Computers and Concrete, An International Journal Vol.17 No.4
The main purpose of this study is to perform optimum cost design of cut and cover RC shallow tunnels using Artificial bee colony and genetic algorithms. For this purpose, mathematical expressions of objective function, design variables and constraints for the design of cut and cover RC shallow tunnels were determined. By using these expressions, optimum cost design of the Trabzon Kalekapısı junction underpass tunnel was carried out by using the cited algorithms. The results obtained from the algorithms were compared with the results obtained from traditional design and remarkable saving from the cost of the tunnel was achieved.
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Effect of Type 2 Diabetes Mellitus on Prognosis of Nonmetastatic Renal Cell Cancer
Evren Süer,Erdem Öztürk,Ömer Gülpınar,Aytaç Kayış,Sümer Baltacı 대한비뇨의학회 2013 Investigative and Clinical Urology Vol.54 No.8
Purpose: We evaluated the prognostic value of type 2 diabetes mellitus (DM) in patients treated surgically for localized renal cell carcinoma (RCC). Materials and Methods: Between 1995 and 2011, 588 patients with renal tumor diagnoses were treated surgically and 492 patients with pathologically confirmed nonmetastatic RCC diagnoses were included in the study. The associations of clinical and pathologic parameters with a type 2 DM diagnosis were evaluated. Kaplan-Meier estimations for disease-specific survival (DSS) and overall survival (OS) were generated according to type 2 DM diagnosis, and the log-rank test was used to compare survival according to the variables. Results: The mean age of the patients was 56.7±12 years (range, 15 to 84 years; median, 58 years) and the mean length of follow-up was 35.9±28 months (range, 1 to 145 months; median, 34.3 months). Of the 492 patients, 62 (12.6%) had a diagnosis of DM at the time of surgery (group I) and 430 did not have DM (group II). The mean age and the incidence of clear cell RCC histological subtype were significantly higher in group I than in group II (p<0.001 and p=0.036, respectively). Although DSS and OS were lower in group I, this difference was not significant. Type 2 DM was not detected as an independent prognostic factor for DSS and OS. Conclusions: This study investigated the role and effect of DM on the prognosis of localized RCC that was treated surgically. The present study did not detect DM as an independent prognostic factor for RCC.
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Ömer Gülpınar,Evren Süer,Mehmet İlker Gökce,Ahmet Hakan Haliloğlu,Erdem Öztürk,Nihat Arıkan 대한비뇨의학회 2013 Investigative and Clinical Urology Vol.54 No.6
Purpose: To evaluate the long-term outcomes of artificial urinary sphincter (AUS) implantation and to report the complication rates, including mechanical failure, erosion,and infection. Materials and Methods: From June 1990 to May 2011, AUS (AMS 800) implantations were performed in 56 adult males by one surgeon. Various demographic and preoperative variables, surgical variables, and postoperative outcomes, including success and complication rates with a median follow-up of 96 months, were recorded retrospectively. Results: The mean age of the patients at the time of AUS implantation was 61.8 (±14.2)years. During the follow-up period, the total complication rate was 41.1% (23 patients). The incidence of complications was significantly lower during the follow-up period after 48 months (p<0.05). Kaplan-Meier analysis revealed that 5- and 10-year failure-free rates were 50.3% and 45.2%, respectively. Conclusions: Long-term durability and functional outcomes are achievable for the AMS 800, but there are appreciable complication rates for erosion, mechanical failure, and infection of up to 30%.
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Onur Yılmaz,Ali Barlas Mırçık,Merve Kunduz,Müge Çombaş,Ahmet Öztürk,Erdem Deveci,İsmet Kırpınar 대한신경정신의학회 2019 PSYCHIATRY INVESTIGATION Vol.16 No.7
Objective This study compared the effects of cognitive behavioral therapy (CBT), existential psychotherapy (ExP) and supportive counseling (SUP) on facial emotion recognition among mildly and moderately depressed patients. Methods 21 patients for CBT, and 20 each for ExP and SUP groups with 60 healthy controls were investigated. Eight consecutive weekly sessions and following two monthly boosters were performed. Prior to the sessions, all subjects received Sociodemographic Data Form, the Structured Clinical Interview for DSM-IV Axis I Disorders (SCID-1), and Facial Emotion Recognition Test (FERT). Patients received Hamilton Depression Rating Scale (HDRS) and FERT at the onset and after weekly and booster sessions. Results Patients’ ability to recognize surprised and neutral emotions were lower than controls. ExP group improved recognition of almost all emotions, CBT group improved only happy emotions and SUP group did not improve any emotions. HDRS scores declined in all patient groups, ExP and CBT groups had lower scores than SUP. Conclusion MDD patients recognized surprised and neutral emotions lower than controls. ExP improved ability to recognize almost all emotions, CBT improved only happy emotions, SUP did not improve at all. ExP, CBT and SUP all led to a reduction in MDD. ExP and CBT had comparable effects and both were more helpful than SUP.
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