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- 저자 : Kardes, Ozgur (검색결과 5 건)
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Hybrid Steel Sheet Trends for Automotive Stampings
Sever Nimet Kardes 한국자동차공학회 2021 International journal of automotive technology Vol.22 No.5
This study provides information on the hybrid steel sheets available for the use of carmakers. The automotive industry has been working on many different areas simultaneously to improve the performance of vehicles such as lightweighting, safety, clean energy resources, and noise-vibration-harshness (NVH). Steel is the dominant material for most vehicles. However, there are currently many alternative materials to steel such as aluminum, magnesium, titanium, plastics, carbon fiber, etc. Therefore, a lot of research has been done to keep steel as the material of choice for vehicles by the steel and material industries. Hybrid steel materials have been introduced to compete with these alternative materials. Hybrid steel materials are developed for light-weighting and/or acoustic insulation applications. They provide a good balance between cost and weight. In this study, the definition of hybrid steel materials is explained. Emerging and available products with their technical properties and possible applications are reviewed.
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Massive Calcified Cerebellar Pilocytic Astrocytoma with Rapid Recurrence : A Rare Case
Aydemir, Fatih,Kardes, Ozgur,Kayaselcuk, Fazilet,Tufan, Kadir The Korean Neurosurgical Society 2016 Journal of Korean neurosurgical society Vol.59 No.5
Pilocytic astrocytomas (PAs) are World Heath Organization Grade I tumors and are most common in children. PA calcification is not a common finding and has been reported more frequently in the optic nerve, hypothalamic/thalamus and superficially located cerebral tumors. We present a cerebellar PA in a 3-year-old male patient with cystic components and massive calcification areas. The residual tumor grew rapidly after the first operation, and the patient was operated on again. A histopathological examination revealed polar spongioblastoma-like cells. Massive calcification is not a common feature in PAs and can lead to difficulties in radiological and pathological differential diagnoses.
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Aydemir, Fatih,Cekinmez, Melih,Kardes, Ozgur,Kayaselcuk, Fazilet The Korean Neurosurgical Society 2016 Journal of Korean neurosurgical society Vol.59 No.2
Ganglion cell tumors (GCT) are divided into two subtypes : gangliocytoma and ganglioglioma. Intramedullary gangliocytomas are extremely rare. A 20-year-old male patient with pain of neck, who also had a previously known neuroendocrine tumor of lung, was operated for mass found in the cervicomedullary junction with a presumptive diagnosis of metastases. Only partial resection could be performed. Pathological diagnosis had been reported as gangliocytoma. Only ten cases of intramedullary gangliocytoma have been reported in the literature. Although association with scoliosis and Von Recklinghausen;s disease were previously reported in the literature, no gangliocytoma case concomitant with endocrine tumor of lung have been published. Pathological study is the most important diagnostic method for gangliocytomas. Surgical excision is the primary treatment, but difficulty in total surgical tumor resection is the most important problem.
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Investigation of Galling In Forming Galvanized Steel Sheet
( Taylan Altan ),( Nimet Kardes ),( Hyunok Kim ) 한국부식방식학회(구 한국부식학회) 2011 Corrosion Science and Technology Vol.10 No.1
The major purpose of the present study is to evaluate the performance of various galvanized (GI) or galvannealed (GA) mild steels and AHSS in stamping applications. Finite Element Analysis (FEA) of selected stamping operations was conducted to estimate the critical pressure boundary conditions that exist in practice. Using this information, laboratory tribotests, e.g. Twist Compression (TCT), Deep Drawing (DDT) and Strip Drawing (SDT) Tests, were developed to evaluate the performance of selected lubricants and die materials/coatings in forming galvanized steels of interest. The sheet materials investigated included mild steels and AHSS (e.g. DP600 GI/GA, DP780 GI/GA, TRIP780 GA and DP980 GI/GA). Experimental results showed that galvanized material resulted in more galling, while galvannealed material showed more powdering and flaking. The surface roughness and chemical composition of galvanized sheet materials affected the severity of galling under the same testing conditions, i.e. lubricants and die materials/coatings. The results of this study helped to determine the critical interface pressure that initiates lubricant failure and galling in stamping selected galvanized sheet materials. Thus, to prevent or postpone the critical interface conditions, the results of this study can be used to select the optimum combination of galvanized sheet, die material, die coating and lubricant for forming structural automotive components.
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Civi, Soner,Durdag, Emre,Aytar, Murat Hamit,Kardes, Ozgur,Kaymaz, Figen,Aykol, Sukru The Korean Neurosurgical Society 2017 Journal of Korean neurosurgical society Vol.60 No.4
Objective : Repair of sensorial nerve defect is an important issue on peripheric nerve surgery. The aim of the present study was to determine the effects of sensory-motor nerve bridging on the denervated dermatomal area, in rats with sensory nerve defects, using a neural cell adhesion molecule (NCAM). Methods : We compared the efficacy of end-to-side (ETS) coaptation of the tibial nerve for sural nerve defect repair, in 32 Sprague-Dawley rats. Rats were assigned to 1 of 4 groups : group A was the sham operated group, group B rats had sural nerves sectioned and buried in neighboring muscles, group C experienced nerve sectioning and end-to-end (ETE) anastomosis, and group D had sural nerves sectioned and ETS anastomosis was performed using atibial nerve bridge. Neurological evaluation included the skin pinch test and histological evaluation was performed by assessing NCAM expression in nerve terminals. Results : Rats in the denervated group yielded negative results for the skin pinch tests, while animals in the surgical intervention groups (group C and D) demonstrated positive results. As predicted, there were no positively stained skin specimens in the denervated group (group B); however, the surgery groups demonstrated significant staining. NCAM expression was also significantly higher in the surgery groups. However, the mean NCAM values were not significantly different between group C and group D. Conclusion : Previous research indicates that ETE nerve repair is the gold standard for peripheral nerve defect repair. However, ETS repair is an effective alternative method in cases of sensorial nerve defect when ETE repair is not possible.
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