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RISS 인기검색어
- 검색키워드
- 저자 : Karakose, (검색결과 3 건)
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Calik-Karakose, Ulku H.,Orakdogen, Engin,Saygun, Ahmet I.,Askes, Harm Techno-Press 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.52 No.2
A four-noded curved shell finite element for the geometrically non-linear analysis of beams curved in plan is introduced. The structure is conceived as a sequence of macro-elements (ME) having the form of transversal segments of identical topology where each slice is formed using a number of the curved shell elements which have 7 degrees of freedom (DOF) per node. A curved box-girder beam example is modelled using various meshes and linear analysis results are compared to the solutions of a well-known computer program SAP2000. Linear and non-linear analyses of the beam under increasing uniformly distributed loads are also carried out. In addition to box-girder beams, the proposed element can also be used in modelling open-section beams with curved or straight axes and circular plates under radial compression. Buckling loads of a circular plate example are obtained for coarse and successively refined meshes and results are compared with each other. The advantage of this element is that curved systems can be realistically modelled and satisfactory results can be obtained even by using coarse meshes.
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Yuksel, Mehmet Bilgehan,Karakose, Ayhan,Gumus, Bilal,Tarhan, Serdar,Atesci, Yusuf Ziya,Akan, Zafer Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.11
Background: To evaluate the results of various types of radiofrequency ablation (RFA) treatment of renal tumors in patients with excessive anesthetic and surgical risk. Materials and Methods: Data for RFA performed in in high risk patients were retrospectively evaluated. Other RFA applications in patients with no anesthetic and/or surgical risk were excluded. RFA was by ultrasound or CT guided percutaneous (USG/CT-PRFA) and retroperitoneally or transperitoneally laparoscopic (R/T-LRFA) techniques under general or local anethesia. Follow-up data of enhanced CT or MRI after 1, 3 and 6 months were analysed for twelve RFA applications. Results: The RFA applications included 4 (40%) left-sided, 5 (50%) right-sided and 1 (10%) bilaterally RFA (simultaneously 1 right and 2 left). The localizations of tumors were 2 (16.6%) upper, 5 (41.6%) mid and 5 (41.6%) lower pole. The RFA applications included 9 (75%) USG-PRFA, 1 (8.3%) CT-PRFA, 1 (8.3%) T-LRFA and 1 (8.3%) R-LRFA. The mean age was $65.3{\pm}8.5$ (52-76) years. The mean tumor size was $29.6{\pm}6.08$ (15-40) mm. No complications related to the RFA were encountered in any of the cases. Failure (residual tumour) was determined in 8.3% (1/12) of USG-RFA application. The success rate was thus 91.7% (11/12). Other 1st, 3rd and 6th months follow-up data revealed no residua and recurrence. Conclusions: RFA application appears to be safe as a less invasive and effective treatment modality in selected cases of small renal tumors in individuals with excessive anesthetic and also surgical risk.
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Depth Sensing Indentation Analyses of Hypereutectic Al-10Ni – XSc (X = 0, 1, 2) Alloys
M. Fatih Kilicaslan,Ercan Karakose 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.3
Depth sensing indentation analyses of hypereutectic Al-10Ni alloys with different amounts of Sc content wereperformed to determine the values of elastic modulus, dynamic microhardness, creep rate and elastic recoveryrate. Microstructural characterizations were performed by using scanning electron microscopy (SEM), SEMmapping and an X-ray diffractometer. The results revealed that the addition of Sc refined the intermetallic phasesof Al and Ni, and led to the formation of two additional intermetallic phases as well, namely Al3Sc andmetastable Al9Ni2. The Al-Ni alloys investigated in this work exhibited elastoplastic behavior at room temperatureand the addition of Sc influences their elastic-plastic responses to the indentation process. In addition,dynamic microhardness of them exhibited a load-dependent character called the indentation size effect. Theaddition of Sc considerably improved the values of dynamic microharddness, elastic modulus and elasticrecovery rate. It also resulted in a lower creep displacement rate.
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