Interlinked positive feedback loops,as an important building block of biochemical system,can induce a bistable switching leading to long-lasting state changes by brief stimuli.A single positive feedback loop with some...
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Interlinked positive feedback loops,as an important building block of biochemical system,can induce a bistable switching leading to long-lasting state changes by brief stimuli.A single positive feedback loop with some ultrasensitivity is considered sufficient to act as a bistable ***,multiple interconnected positive feedback loops are frequently found in subnetworks of large cellular and genetic networks over a range of biological *** studies have used generic models extracted from many realistic biological circuits to examine how organisms might gain an advantage by using reinforcing positive feedback *** now these generic models have not considered mutual activation between species,even though it is a prevalent *** this work,the prevalent mutual activation between two species as another positive feedback is added into a generic interlinked positive feedback loops model based on many realistic biological *** biological system,single-parameter control is ubiquitous,and noise originated from single-parameter fluctuation often brings additional fluctuations larger than other noise *** we introduce a stochastic fluctuation of the positive feedback strength between these two species to investigate noise-induced bistable switching dynamics and population dynamics on the stochastic switching between two stable steady states,based on the fraction of transition induced by both the feedback strength and noise ***,we apply stability analysis based on the potential energy landscape to explore the noise-induced switching behavior of these two stable steady states.
While traditional traffic control strategies have shown their merits in increasing safety and vehicular flow for *** emerging adaptive cruise control(ACC)has a potential to substantially improve the safety and efficie...
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While traditional traffic control strategies have shown their merits in increasing safety and vehicular flow for *** emerging adaptive cruise control(ACC)has a potential to substantially improve the safety and efficiency of the traffic *** current ACC systems emphasize vehicle tracking performance with limited consideration of driving comfort and fuel *** paper presents a multi-objective design strategy for ACC taking into account both the vehicle tracking performance and fuel *** have been many studies of multi-objective optimization control design for linear systems,and much less for nonlinear *** algorithms have been developed to solve multi-objective optimization problems(MOPs).In this paper,we shall adopt the cell mapping *** cell mapping method was developed for global analysis of nonlinear dynamic ***,it is extended to multi-objective optimization *** paper presents a multi-objective optimal design of adaptive cruise control of vehicles with a hybrid cell mapping *** optimally designed control is compared with a modal predictive control(MPC),which has been used to solve MOPs of ACC design by many *** is an on-line algorithm that has much computation burden,and thus not efficiently *** have found that the cell mapping method for multi-objective optimal control design is far more efficient than the on-line design of MPC,and that the multi-objective optimal control achieves excellent tracking performance and fairly low values of the objective functions compared with MPC.
The centrifugal governor plays an important role in many rotational machines such as diesel engine,steam engine and so *** this paper,the two types of impulse excitation caused by non-smooth impact-rub of the rotor sy...
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The centrifugal governor plays an important role in many rotational machines such as diesel engine,steam engine and so *** this paper,the two types of impulse excitation caused by non-smooth impact-rub of the rotor system are applied to *** feedback control problem of designing Neimark-Sacker bifurcation in a centrifugal governor system is addressed.A feedback control method is proposed to achieve three aspects of control objectives including existence,stability,and adjusting mean radius of cross section of the limit *** explicit criterion without using eigenvalue computation including eigenvalue assignment and transversality conditions is utilized to derive the linear gains responsible for control of the bifurcation *** center manifold theory and normal form reduction is utilized to derive the nonlinear gains responsible for control of the stability of the *** expression of mean radius of cross section of the limit torus is developed to derive the nonlinear gains responsible for controls of *** simulations for a centrifugal governor system show that Neimark-Sacker torus with desired properties can be created at any a pre-specified parameter point.
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