A robust servo-system, based on a combination of linear robust control and sliding mode control have been proposed. This new control system can be said to be a nonlinear system (sliding mode control system) which has a inner loop of linear control (two-degree-of-freedom control). Due to this inner loop of linear control, a disturbance is strongly suppressed but not completely. Then, the outer l...

|A robust servo-system, based on a combination of linear robust control and sliding mode control have been proposed. This new control system can be said to be a non-linear system (sliding mode control system) which has a inner loop of linear control (two-degree-of-freedom control). Due to this inner loop of linear control, a disturbance is strongly suppressed but not completely. Then, the outer...

freedom is one of the greatest and highest human values and of necessities of life and evolution that all nations have wanted its realization. the word freedom dates back to human history and it has found criterion and rate through indicators such as truth-seeking, justice and human's existential growth and defines its own limits and is manifested in literature of different nations in vari...

There are two kinds of expressions on the precession of orbital plane of a binary pulsar system. This paper analyzes that one expression is inconsistent with the conservation of the total angular momentum vector; whereas the other one is consistent with it. And the reason is that the former is obtained in the case of 12 degree of freedom to a binary pulsar system is; whereas the other one corre...

In this paper a simple tool for seismic design of steel structures for a selected ductility level is presented. For this purpose, a consistent set of earthquakes is selected and sorted based on the maximum acceleration of ground surface. The selected records are applied as the base motion to a single-degree-of-freedom system with strain hardening and the maximum response acceleration is determi...

Under open and dense conditions we show that Arnold diffusion orbits exist in a priori unstable and time-periodic Hamiltonian systems with two degrees of freedom. 1, Introduction and Results By the KAM (Kolmogorov, Arnold and Moser) theory we know that there are many invariant tori in nearly integrable Hamiltonian systems with arbitrary n degrees of freedom. These tori are of n dimension and oc...

This study examines the issue of standards of freedom of the press in democracy. Freedom of the press should benefit citizens in democratic societies, yet historically, the press has mainly served dominant group interests that are based on capital and power. The problem of serving special interests and collusion exists globally. It examines how well the principle of press freedom operates in de...