40 research outputs found

    The Real Time Implementation of a Chaotic System’s Synchronization for Secure Communication

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    The chaotic systems are preferred in secure communication systems as well as used in many different implementation areas. Real time chaos synchronization is also required for secure communication systems. In this study, the Master–Slave synchronization of chaotic Chen system was performed on a real time implementation for the secure communication systems. Active control method was used in the design of controller required for the realization of synchronization. The successful realization of the Master-Slave synchronization of the Chen system by using the controller designed on MATLAB/Simulink was shown by the obtained simulation results. Moreover, by using analogue outputs of NI-DAQ card, the Master-Slave synchronization of the Chen system was obtained and secure communication was achieved on a real time basis under LabVIEW environment

    A Rare Cause of Pruritus That is Seen Frequently in Hemodialysis Patients: Kyrle's Disease

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    WOS: 000417359300027Uremic pruritus is a common complication of chronic renal failure. It affects approximately half of patients undergoing dialysis treatment. Even if the pruritus is not hazardous alone, it causes physical and mental fatigue, insomnia, chronic fatigue, decrease in self care ability and life quality. The causes of pruritus and the pathophysiology are stil not fully understood. Xerosis, intradermal microprecipitation of divalent ions, secondary hyperparathyroidism, peripheral neuropathy, allergic reactions, hypersensitivity and histamine have been considered as pathogenetic factors. Kyrle's disease is a rare disorder of keratinization which is one of the perforating disorders of the skin. Herein, we report a case of Kyrle's disease which is seen rarely, as a cause of pruritus in a 68 year old female patient who is on regular hemodialysis treatment secondary to end stage renal failure due to diabetic nephropathy, in the light of existing literature

    The effect of high-dose steroid treatment used for the treatment of acute demyelinating diseases on endothelial and cardiac functions

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    Objective: The cardiovascular effects of short-term high-dose steroid treatment (pulse steroid treatment) have not yet been clarified. We examined the short-and long-term effects of pulse steroid treatment in demyelinating diseases on endothelial and cardiac functions. Methods: In this prospective study, we included 35 patients (20 females and 15 males; mean age, 32.8 +/- 9.3 years) who were not treated with steroids and who were previously diagnosed with multiple sclerosis or neuromyelitis optica. Patients were evaluated before, 1 week after, and 3 months after the steroid treatment. Brachial artery flow-mediated relaxation and cardiac systolic/diastolic function were evaluated using echocardiography to assess physical examination results, carotid intima-media thickness, and endothelial function. Results: There was no difference between biochemical values, systolic function, left ventricular dimensions, and carotid intima-media thicknesses in the three evaluation periods. There were significant increases in the body mass index, body weight, and systolic/diastolic blood pressure measurements at 1 week and 3 months after treatment (p<0.001). There was a significant decrease in brachial artery flow-mediated relaxation at 1 week and 3 months (1 versus 2, p=0.042; 1 versus 3, p=0.003). In Doppler measurements at 1 week and 3 months, there was an increase in mitral A velocity, IVRT, and EDT values and a decrease in the E/A ratio in line with diastolic dysfunction. Conclusion: Pulse steroid therapy used for demyelinating diseases deteriorated endothelial and left ventricular diastolic functions in the early and late periods. Future studies are needed to evaluate the development of cardiovascular mortality and morbidity in patients receiving this type of treatment

    A green approach for formation of silver nanoparticles on magnetic graphene oxide and highly effective antimicrobial activity and reusability

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    We report the a green approach for the synthesis of silver nanoparticles (Ag NPs) decorated magnetic graphene oxide nanocomposites (Ag@MGO NCs), which showed highly effective inhibitory property and reusability even at the very low concentration (12.5 ppm) towards Staphylococcus aureus (Gram +), Escherichia coli (Gram-) bacteria and Candida albicans fungus. It is worthy to mention that each component, such as GO, triethylene glycol (TREG) and Matricaria chamomilla (M. chamomile) plant extract (20% w/v), used for the synthesis of Ag@MGO NCs is safe and biocompatible. Although GO showed no significant inhibitory property, M. chamomile directed Ag@MGO NCs exhibited highly enhanced superior inhibitory activity. Benefiting from magnetic property of Ag@MGO NCs allows us for repeated use of them in inhibitory experiment. (C) 2016 Elsevier B.V. All rights reserved

    Tuning of Optimal Classical and Fractional Order PID Parameters forAutomatic Generation Control Based on the Bacterial Swarm Optimization

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    9th IFAC Symposium on Control of Power and Energy Systems (CPES 2015) -- DEC 09-11, 2015 -- New Delhi, INDIAOzdemir, Mahmut Temel/0000-0002-5795-2550; EKE, ibrahim/0000-0003-4792-238X; CELIK, Vedat/0000-0001-8870-8465WOS: 000375855300086Particle Swarm Optimization algorithm converges rapidly during the initial stage of a global search, but around global optimum, the search process slows down. In order to overcome this problem and to further enhance the performance of Particle Swarm Optimization. this paper implements a hybrid algorithm. Bacterial Swarm Optimization, combining the features of Bacterial Foraging Optimization and Particle Swarm Optimization The PID parameters of classical and fractional-order controllers are optimized with Bacterial Swann Optimization for load frequency control of a two area power system. Simulation results show fractional-order PID controller has less settling time and less overshoot than the classical PID controller for most of studies. (C) 2015, IFAC (International Rderation or Automatic Control) Hosting by Elsevier Ltd. All rights reserved

    Translation and validation of chronic otitis media benefit inventory (COMBI) in Turkish language

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    Objective: The aim of this study was to translate the Chronic Otitis Media Benefit Inventory (COMBI) into Turkish and evaluate the questionnaire’s reliability in assessing benefit outcomes in patients after ear surgery.Methods: A total of 30 patients with chronic otitis media who underwent ear surgery were asked to fill out the translated Turkish version of the COMBI questionnaire six months after their surgery twice, 10 days apart. The patients were divided into two groups in two different ways based on surgical and audiological outcomes. These were surgical success (SS), surgical failure (SF), audiological success (AS), audiological failure (AF) groups. Student's -t test was performed to show the differences in the COMBI scores of the groups. Cronbach’s alpha value was calculated to test internal consistency, Pearson’s correlation coefficient was measured to demonstrate test-retest reliability and factor analysis was run.Results: The average score of the SS group was 51.08 and significantly higher than the score of the SF group (42.40) (p=0.012). There was, however, no statistically significant difference between the average scores of the AS and the AF groups (p=0.330). A Cronbach’s alpha value of 0.862 was found. Pearson’s r value was calculated 0.810. Factor analysis showed that a three-factor solution explained the 70.2% of the variance.Conclusion: The Turkish version of the COMBI is a valid test with high test-retest reliability. It should be used with objective assessment tools for better understanding how patients benefit from the surgery

    Lifetime PTSD and quality of life among alcohol-dependent men: Impact of childhood emotional abuse and dissociation

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    The aim of this study was to investigate the impact of lifetime posttraumatic stress disorder (PTSD), dissociation and a history of childhood trauma on quality of life (QoL) among men with alcohol dependency. A consecutive series of alcohol-dependent men (N=156) admitted to an inpatient treatment unit were screened using the Michigan Alcoholism Screening Test, the Clinician Administered PTSD Scale, the Dissociative Experiences Scale, and the Childhood Trauma Questionnaire. QoL was assessed using the Medical Outcomes Study Short-Form 36-item health survey. Fifty (32.1%) patients had lifetime diagnosis of PTSD. Besides problems related to severity of alcohol use, the lifetime PTSD group was impaired on several physical and mental components of QoL. While the lifetime PTSD group and remaining patients did not differ on reports of childhood trauma and dissociation, in lifetime PTSD group, dissociative patients had higher scores of childhood emotional abuse than those of the non-dissociative patients. In multivariate covariance analysis, both dissociation and lifetime PTSD predicted impairment in physical functioning, general health, vitality, and mental health components of QoL Among alcohol-dependent men with lifetime PTSD. a history of childhood emotional abuse contributes to impairment of QoL through its relationship with dissociation. (C) 2010 Elsevier Ireland Ltd. All rights reserved
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