sleep plays a vital role in regulating physiological mechanisms in the human body. nowadays, by the change of lifestyle and as a consequence of longer work hours and increased accessibility to media, sleep disturbance becomes a common problem in modern society. many studies demonstrated that sleep disturbance triggers a systemic low-grade inflammation by increasing the level of several cytokine...

As well known, robot manipulator is utilized in many industrial fields. However manipulator motion has a single function at most and is so limited because of low degree-offreedom motion. To improve this issue, it is necessary for the robot manipulator to have redundant degree-of-freedom motion. The motion spaces of redundant manipulator are divided into work space motion and null space motion. ...

We study the disturbance decoupling problem for linear time invariant descriptor systems. We give necessary and suucient conditions for the existence of a solution to the disturbance decoupling problem with/without stability via a proportional and/or derivative feedback that also makes the resulting closed-loop system regular and/or of index at most one. All results are proved constructively ba...

In this letter, a model based disturbance attenuator (MBDA) for robot manipulators is proposed and the stability of the MBDA in robot positioning problems is proved via Liapunov’s direct method. This method does not require an accurate model of a robot manipulator and takes care of disturbances or modelling errors so that the plant output remains relatively unaffected by them. The output error ...

In this paper, we consider the problem of input disturbance suppression for nonlinear systems based on feedforward passivity. Firstly, we show that integral control can sufficiently suppress a class of slowly variant (including constant) input disturbance and track constant references provided certain closed-loop stability is achieved. Then, sufficient conditions of integral controllability for...

Power systems are highly nonlinear but we depend to a large extent on linearized methods for analysis and controller design. Aspects of small disturbance stability such as its dependence on parametric change require study of the underlying bifurcation boundaries. Control measures to alleviate problems require sensitivity of margins of stability. In this paper, optimization frameworks developed ...

A theoretical framework and conceptual model for temporal stability of forest tree-species composition was developed based on a synthesis of existing studies. The model pertains primarily to time periods of several tree lifetimes (several hundred to a few thousand years) at the neighborhood and stand spatial scales (0.01–10 ha), although a few extensions to the landscape scale are also made. Th...

Due to the requirement of dealing with the uncertainty and random disturbance in the real-time applications, a framework of adaptive type-2 fuzzy control system is designed. Since most of existed stability analysis results can not be used for the proposed system, by transferring the interval membership degrees into the constrained typical membership degrees, the closed-loop stability of propose...

In this paper disturbance decoupling problems without stability and with quadratic stability for switched linear systems are formulated in the framework of the so-called geometric approach. Firstly, necessary and sufficient conditions for the problem without stability to be solvable are given. Secondly, sufficient conditions for the problem with quadratic stability to be solvable are given. Fur...

We study low-gain (P)roportional (I)ntegral control of multivariate discrete-time, forced Lur'e systems to solve the output-tracking problem for constant reference signals. formulate an incremental sector condition which is sufficient a usual linear PI controller achieve exponential disturbance-to-state and disturbance-to-tracking-error stability in closed-loop, all sufficiently small integrato...