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Petar Avramovski,Pavlina Janakievska,Kosta Sotiroski,Aleksandar Sikole 대한내과학회 2013 The Korean Journal of Internal Medicine Vol.28 No.4
Background/Aims: The aim of this study was to compare the progression of aortic stiffness in chronic hemodialysis patients (CHP) with that of general population patients (GPP) over a 36-month period and to evaluate the determinants of this progression. Methods: The study group included 80 patients undergoing hemodialysis (aged 59.3 ± 11.8 years; duration of dialysis 5.47 ± 5.16 years). The control group consisted of 60 patients (aged 57.5 ± 10.9 years) with a glomerular filtration rate of > 60 mL/min/1.73 m2. Pulse wave velocity (PWV) was determined from time diversity propagation of the common carotid artery and femoral artery by Doppler ultrasound. Clinical and biochemical parameters were determined in serum using standard laboratory procedures. Results: The mean PWV values at baseline and 36 months were 11.18 ± 2.29 and 11.82 ± 2.34 m/sec in the CHP group, and 9.02 ± 1.89 and 9.29 ± 1.93 m/sec in the GPP group, respectively. The average PWV progressions were 63.95 ± 18.373 cm/sec in CHP and 27.28 ± 28.519 cm/sec in GPP. By multiple regression analysis,hemoglobin (standardized coefficient β [βst] = -0.405, p = 0.004; βst = -0.364, p =0.011), albumin (βst = -0.349, p = 0.042; βst = -0.303, p = 0.034), CRP (βst = 0.458, p =0.002; βst = 0.187, p = 0.008), and total cholesterol (βst = 0.236, p = 0.038; βst = 0.171,p = 0.078) were independently associated with PWV in the CHP and GPP groups,respectively. Conclusions: Accelerated arterial stiffness was more pronounced in the CHP group than in the GPP group. The independent determinants of this progression in both groups include traditional risk factors and blood levels of hemoglobin,albumin and CRP. Cholesterol and uremia-related factors are determinants only in CHP.
Application of a combined heating system for the warm hydroforming of lightweight alloy tubes
Yi, H.K.,Pavlina, E.J.,Van Tyne, C.J.,Moon, Y.H. Elsevier 2008 Journal of materials processing technology Vol. No.
A combined heating system - comprised of an induction coil plus a heating element - has been applied to the warm hydroforming of aluminum alloy tubes. For the rapid heating of tubes, a specially designed induction heating system has been developed as the main heating source. The induction heating system uses a high frequency induction coil in order to concentrate the energy into the tube and reduce energy losses. However, heat produced by the induction heating system was unequally distributed over the length and circumference of the tube, and as a result, the temperature distribution was non-uniform. An additional heating element was inserted into the inside of the tube to increase temperature uniformity by maintaining the forming temperature and reducing the heat lost to the tooling. Warm hydroforming tests with the combined heating system exhibit increased hydroformability, producing more uniform bulging in the tubes. The processing parameters such as internal pressure, axial feeding and heating conditions have also been successfully optimized.
Argunova, Anastasiia G.,Petrova, Pavlina N.,Okhlopkova, Aitalina A.,Shadrinov, Nikolay V.,Gogoleva, Olga V.,Cho, Jin-Ho Korean Chemical Society 2015 대한화학회지 Vol.59 No.3
The effect of ultrasonication on PTFE and its composites with zeolite and fluoroplast F-4NTD-2 was studied. Ultrasonication was found to cause changes in the supramolecular structure, and consequently, the tensile strength, relative elongation, and mass wear rate. Changes in the topology of the materials following ultrasonication were investigated by scanning electron microscopy. The optimum enhancement of the desired properties was found in the PTFE composite containing 2% activated zeolite.
Punching Shear Failure of Concrete Ground Supported Slab
Oldrich Sucharda,Martina Smirakova,Jana Vaskova,Pavlina Mateckova,Jan Kubosek,Radim Cajka 한국콘크리트학회 2018 International Journal of Concrete Structures and M Vol.12 No.4
The article handles potential approaches to design and determination of total load capacity of foundation slabs and floors. The research is focused on punching shear failure of reinforced ground supported slab. The article presents detailed results of the experiment made and advanced numerical modelling based on nonlinear analysis and application of fracture-plastic model. The experiment made included a 2.0 × 1.95 m reinforced concrete slab-on-ground of 120 mm thickness. The experiment was followed by a parametric study of total load capacity calculation with nonlinear analysis which is supplemented by calculations based on existing design model code.
Cyber security of critical infrastructures
Leandros A. Maglaras,김기형,Helge Janicke,Mohamed Amine Ferrag,Stylianos Rallis,Pavlina Fragkou,Athanasios Maglaras,Tiago J. Cruz 한국통신학회 2018 ICT Express Vol.4 No.1
Modern Supervisory Control and Data Acquisition (SCADA) systems are essential for monitoring and managing electric power generation, transmission and distribution. In the age of the Internet of Things, SCADA has evolved into big, complex and distributed systems that are prone to be conventional in addition to new threats. Many security methods can be applied to such systems, having in mind that both high efficiency, real time intrusion identification and low overhead are required.