35 research outputs found
Modelling, Control and Experimentation for Vibration Suppression of Single Link Flexible Manipulator
No full textThe use of robotic arms in various sectors has been increased over a decade. Attempts to improve their performance and design are being made since many years. The size and weight of these arms have been a matter of concern in their design and application. By reducing the cross-sectional area, the weight of the arm reduces considerably but, the rigidity of the arm has to be compromised since the workspace of the arm cannot be altered. Many researchers have suggested various methods to develop these flexible robotic arms. Due to the non-linearity of the system and the complexity of deriving a solution, only discrete forms of modelling like FEM, lumped parameter method, assumed mode method have gained worldwide recognition. Some of these methods do not produce accurate results even for single arm manipulator system while others produce inaccurate results when the number of arms increases. Therefore, a suitable mathematical technique is yet to be developed which will produce accurate results. A rotary flexible link has been modelled in the present work using a conventional method of modelling (lumped parameter model) and is compared with the Rayleigh beam model developed considering the rotary inertia acting on the flexible link. The Rayleigh beam model is developed using bond graph notation. Both the models are validated with experimental results of rotary flexible link. Modern control theories have been discussed and applied on both the dynamic models. The results obtained are compared with experimentation and final conclusion has been stated in detail. Adequate results have been obtained from the Rayleigh beam theory. This model can be refined further for more accuracy. The model can be extended for multi-link flexible manipulators
Study on The Effects of Various Disintegrants on Amoxicillin Trihydrate Dispersible Tablets
No full textAn ideal drug therapy was based on relating pharmacological response to the dose administered. Poor correlation between the dose administered and pharmacological responses will be resulted because of the decreased absorption rate or poor dose rate. Deviation in the plasma drug concentration also will result due to the formulation factors and elimination characteristics resulting in toxicity. To reduce these problems an appropriate dosage regimen should be selected, which would attain the plasma concentration immediately after the administration and it should also kept the drug concentration below the maximum safe concentration. This possible by the administration of conventional dosage form in a particular dose at a particular frequency and should be convenient to patient for the administration. The aim of the present work was to study the effects of different disintegrants on Amoxicillin trihydrate dispersible tablet and to develop a formulation in a low production value, using cheaper raw material but this raw material shows problems in the release of the drug from the formulation. The Amoxicillin trihydrate is formulated with different disintegrants at various amounts in single and in combination. Ten formulations were developed with four disintegrants using direct compression method and wet granulation method. Each formulation composed of drug and disintegrants at various amount. The disintegrants used in this study are maize starch, crospovidone, croscarmellose, sodium starch glycolate etc. The Preformulation studies and the evaluation studies of the tablet were done and found to be within the limits of the IP. The In-vitro drug release studies are conducted and compared with a standard formulation. The formulation F10 formulated with the combination of Crospovidone and Croscarmellose as disintegrating agents was found to be the optimized formulation. The formulation F10 also exhibited better disintegration time (25 sec) which according to the IP limits is within 3 min. Formulation also shows passes the dispersibility test. The results of dissolution studies indicated that the formulations F3, F8, F9 and F10, were successful and exhibited drug release pattern very close to innovator drug release profile but the drug release of F10 was found to be better than other formulation i.e. (99.11), also the key factor of a dispersible tablet i.e. disintegration time was found to be much better than any other formulation i.e. (25 seconds). Hence F10 was selected as the optimized formulation. The Differential Thermal Analysis (DTA) shows that the developed amoxicillin trihydrate dispersible tablet formulation shows better thermal stability. The X Ray diffraction studies also show no interaction of the drug and excipients. The formulation F10 also passed the test for stability, (30ºc / 65% RH and 40ºc / 75% RH) for three months. The phenomenon of optimized drug release follows Zero order and Korsemeyer-Peppas model. The above study demonstrated that optimized concentrations of disintegrants
Modulation, control and capacitor voltage balancing of alternate arm modular multilevel converter with DC fault blocking capability
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A novel spectrum sensing and accessing framework for cognitive radio in mobile environment
No full textParallel power tapping from LCC HVDC transmission system with Full Bridge Modular Multilevel Converter
No full textA novel submodule capacitor voltage balancing scheme for hybrid cascaded multilevel converter by injection of zero sequence current
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Authentication Issues In Mobile Cloud Computing
No full textMobile cloud computing is a popular topic in today's globe. It helps to improve the performance of mobile devices by utilizing cloud services. Security, particularly authentication in MCC, may be an important need for safeguarding cloud-based computations and communication. Wireless media is used to transmit data between the client and the cloud. As a result, MCC models emphasize fundamental security problems in a range of disciplines, including as authentication, privacy, and trust. Mobile device and cloud computing convergence has mostly led in MCC security threats. This article focuses on the principles of assessing various authentication techniques as well as the security issues that have evolved as a result of the combination of mobile and cloud computing technologies. Existing MCC approaches, according to this study, ignore cloud-to-client authentication issues
