Hypericins, hyperforin and flavonoids are discussed as the main components contributing to the antidepressant action of St. John's wort (Hypericum perforatum). Therefore, the objective of the two open phase I clinical trials was to obtain pharmacokinetic data of these constituents from a hypericum extract containing tablet: hypericin, pseudohypericin, hyperforin, the flavonoid aglycone querceti...

Unmanned aerial vehicle experience different atmospheric uncertainties during their flight. These uncertainties caused the problem in the stability and the desired performance of the system. This research paper structured to nullify the influence of atmospheric turbulence and ground effect on the UAV. The models of Dryden turbulence is used as it is one of the major disturbances affecting the U...

A numerical method for solving the H∞ synthesis problem is presented. The problem is posed as an unconstrained, nonsmooth, nonconvex minimization problem. The optimization variables consist solely of the entries of the output feedback matrix. No additional variables, such as Lyapunov variables, need to be introduced. The optimization procedure uses a line search mechanism where the descent dire...

طلتخملا رطيسملل ميمصت مدقي ثحبلا اذه نا LQR/H-infinity .ةدكؤملا ريغو تاريغتملا ةددعتم ةمظنلأل مت ةفلك ةلاد ىلع ادامتعا ةعجارلا ةيذغتلا ةلاح تباوثل ىلثملا ميقلا داجيا ضرغل يئيزجلا دشحلا ةيلثما ةقيرط مادختسا تاددحم نيب طيلخ نع ةرابع يه ةحرتقملا ةفلكلا ةلاد نا.ةحرتقم LQR و H-infinity حرتقملا رطيسملا نا. ريغتملا ةددعتم ةمظنلأا ضوعي نا ةياع ةءافكبو عيطتسي رطيسملا ةوق تابثا ضرغل .ةيدكؤملا مدع دوجوب ...

This paper describes the application of a robust control technique to a steerable marine radar tracker intended to provide good performance with minimum operator intervention over the course of its lifecycle. The paper shows that the sightline steering problem can be decoupled from the target observation problem and uses a well-known robust control technique (H∞ loop-shaping) to synthesize a co...

— This paper considers the H∞ control problem for a general discrete–time system, possibly improper or polynomial. The parametrization of suboptimal H∞ output feedback controllers is presented in a realization–based setting, and it is given in terms of two descriptor Riccati equations. Moreover, the solution features the same elegant simplicity of the proper case. An interesting numerical examp...

In this paper a magnetostrictive material (Terfenol-D) based active vibration control of high amplitude has been proposed. A single link planar flexible manipulator with rotary joint has been modelled using Terfenol-D as smart active material. H-infinity filter is used in the context to estimate the tip deflection (position) and deflection rate (velocity) of the flexible manipulator based on wh...