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RISS 인기검색어
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- 저자 : Akgoz, Muslum (검색결과 4 건)
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Buckling analysis of linearly tapered micro-columns based on strain gradient elasticity
Akgoz, Bekir,Civalek, Omer Techno-Press 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.48 No.2
The buckling problem of linearly tapered micro-columns is investigated on the basis of modified strain gradient elasticity theory. Bernoulli-Euler beam theory is used to model the non-uniform micro column. Rayleigh-Ritz solution method is utilized to obtain the critical buckling loads of the tapered cantilever micro-columns for different taper ratios. Some comparative results for the cases of rectangular and circular cross-sections are presented in graphical and tabular form to show the differences between the results obtained by modified strain gradient elasticity theory and those achieved by modified couple stress and classical theories. From the results, it is observed that the differences between critical buckling loads achieved by classical and those predicted by non-classical theories are considerable for smaller values of the ratio of the micro-column thickness (or diameter) at its bottom end to the additional material length scale parameters and the differences also increase due to increasing of the taper ratio.
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Dual Mechanical Thrombectomy for Recanalization of a Resistant Acute Posterior Circulation Stroke
Ahmet Peker,Anil Arat,Ayça Akgoz,Ethem Murat Arsava,Mehmet Akif Topçuoglu 대한뇌혈관외과학회 2017 Journal of Cerebrovascular and Endovascular Neuros Vol.19 No.2
A 71-year-old man with acute basilar artery occlusion was referred for endovascular treatment 6 hours after the onset of stroke with a Glasgow Coma Score of 3 and National Institutes of Health Stroke Scale of 27. A cerebral arteriogram revealed occlusion of the left vertebral artery proximally and thromboembolic occlusion of the basilar tip. Direct aspiration and mechanical thrombectomy with various stent retrievers failed to reconstitute arterial flow in the basilar artery. Thrombolysis in cerebral infarction 2b recanalization was achieved only after placement of double Catch Mini stent retrievers through 2 microcatheters, on both side branches of the basilar bifurcation in a kissing fashion and retrieving them simultaneously. It was possible to perform this maneuver through a single distal access catheter without any complications. On follow-up the patient awakened and was able to follow commands on his right side. To our knowledge, dual mechanical thrombectomy with stent retrievers has not been reported in the posterior circulation previously. This technique may be useful in retrieving thrombi located at major intracranial bifurcations of the posterior circulation which do not recanalize with standard mechanical thrombectomy procedures. Although bilateral access to the basilar artery through both vertebral arteries is an advantage in posterior circulation for this technique, dual mechanical thrombectomy can also be performed through a unilateral access.
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Nursel Turkmen,Bulent Eren,Recep Fedakar,Semra Akgoz 대한의학회 2008 Journal of Korean medical science Vol.23 No.6
Hemosiderin deposition is not often recognized on routine examination with hematoxylin and eosin staining; however, iron stains may be helpful in the evaluation of hemosiderin deposition in infant autopsies. This report describes the data obtained from autopsy of 86 infants and children whose deaths were investigated at the Forensic Medicine Council Bursa Morgue Department from January 2000 to January 2003. A histochemical technique was used to identify hemosiderin in lung, liver and spleen specimens, which was correlated with other descriptive variables such as the reported cause of death, postmortem interval, trauma history, gender, and age. There was a weakly positive but significant correlation between lung and liver hemosiderin scores (Spearman’s rank correlation coefficient, rho=0.348, p=0.001); i.e., given an increase in lung hemosiderin scores, an increase in liver hemosiderin scores was also observed. Similarly, a marked positive correlation between spleen and liver hemosiderin scores (Spearman’s rank correlation coefficient, rho=0.335, p=0.002) was observed. The probability of spleen hemosiderin-positive cases belonging to the age group under 6 months was found to be 4.3 times greater than those who were hemosiderin-negative (95% confidence interval, 1.6-11.8). After the major differential diagnoses were ruled out, this study demonstrated, that depending on the statistically assessed morphometric grounds, the presence of hemosiderin deposits in the liver and spleen were significantly higher in the age group under 6 months.
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Yoo, Hee-Bong,Park, Sang-Ryoul,Dong, Lianhua,Wang, Jing,Sui, Zhiwei,Pavš,ič,, Jernej,Milavec, Mojca,Akgoz, Muslum,Mozioğ,lu, Erkan,Corbisier, Philippe,Janka, Má,trai,Cosme, Bru American Chemical Society 2016 ANALYTICAL CHEMISTRY - Vol.88 No.24
<P>Enumeration-based determination of DNA copy-concentration was assessed through an international comparison among national metrology institutes (NMIs) and designated institutes (DIs). Enumeration-based quantification does not require a calibration standard thereby providing a route to 'absolute quantification', which offers the potential for reliable value assignments of DNA reference materials, and International System of Units (SI) traceability to copy number 1 through accurate counting. In this study, 2 enumeration based methods, flow cytometric (FCM) counting and the digital polymerase chain reaction (dPCR), were compared to quantify a solution of the pBR322 plasmid at a concentration of several thousand copies per microliter. In addition, 2 orthogonal chemical-analysis methods based on nucleotide quantification, isotope-dilution mass spectrometry (IDMS) and capillary electrophoresis (CE) were applied to quantify a more concentrated solution of the plasmid. Although 9 dPCR results from 8 laboratories showed some dispersion (relative standard deviation [RSD] = 11.8%), their means were closely aligned with those of the FCM-based counting method and the orthogonal chemical-analysis methods, corrected for gravimetric dilution factors. Using the means of dPCR results, the RSD of all 4 methods was 1.8%, which strongly supported the validity of the recent enumeration approaches. Despite a good overall agreement, the individual dPCR results were not sufficiently covered by the reported measurement uncertainties. These findings suggest that some laboratories may not have considered all factors contributing to the measurement uncertainty of dPCR, and further investigation of this possibility is warranted.</P>
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