The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Eye movement reflects the shift of overt visual attention. Eye movement trajectories from a group of observers can be expressed by a representative scanpath. The representative scan-path can work as a baseline for studies on scanpath prediction as well as provide useful knowledge about group behavior in psychological studies. In this paper, we propose a new framework to summarize a representative...
Successful execution of biomechanical sit-to-stand (STS) task combines a forward thrust phase with an upward extension phase and stable movement termination. We have previously developed a fuzzy dynamic model to analyze the STS task by joining two local linear models, defined at the equilibrium positions, via Gaussian membership functions. The local linear models were obtained from a four-segment...
Based on the Observer/Kalman filter Identification (OKID) and digital redesign of observer-based tracker method for a stochastic chaotic system. An additional digital redesign observer approach is now proposed to obtain a more accurate system identification model. Furthermore, this provides computationally effective initialization low-order observer parameters for the on-line nonlinear model system...
A two-time-scale guidance law is proposed for soft landing on asteroids to recover the desired descent trajectory in the presence of uncertainties due to inaccurate model of the asteroid's gravitational field as well as solar gravity and radiation pressure. A high-gain observer estimates the uncertainties over the faster time scale and a nonlinear controller uses these estimates to cancel the effect...
This paper presents the details and experimental results from an implementation of real-time trajectory generation and parameter estimation of a dynamic model using the Baxter Research Robot from Rethink Robotics. Trajectory generation is based on the maximization of Fisher information in real-time and closed-loop using a form of Sequential Action Control. On-line estimation is performed with a least-squares...
This work proposes and investigates a tracking scheme for linear, constrained system based on a combination of model predictive control, virtual references and unknown input observers. In contrast to existing results the proposed approach allows to track a larger class of trajectories exactly: it does not require a reference model, does not need to assumes constant/periodic references or that the...
This paper presents an active disturbance rejection guidance method using quadratic transition for the atmospheric ascent guidance problem. The quadratic transition is designed from the current flight states with a reference trajectory planned off-board. For any states error, the solution of the designed quadratic transition converges to the reference trajectory. The guidance command is obtained from...
Model predictive control allows systematic handling of physical and operational constraints through the use of constrained optimisation. It has also been shown to successfully exploit plant redundancy to maintain a level of control in scenarios when faults are present. Unfortunately, the computational complexity of each individual iteration of the algorithm to solve the optimisation problem scales...
A control algorithm for the problem of formation flying for autonomous underwater vehicles is presented. Using a restrictive communication scheme and LQ optimal control, the control algorithm respects the limitations of underwater communication and on-board computing power. The influence of restricting communications on the performance of the control algorithm is illustrated by a simulation.
In this work a model-based output control scheme for resource constrained control systems using output feedback is proposed. In this context resource constrained means limited energy and limited computational resources mainly in the sensor. A heuristic adaptation law schedules the transmission intervals in order to cope with these constraints. Two different structures are presented: An observer based...
Video target tracking is being a hot research subject applied in solving a wide range of real world electronic monitoring problems. In this work, a predictive tracking approach is presented by adopting control-based full state observer (FSO) tactics. To remedy the tracking precision inadequacy compromised by using only a FSO, a lowpass filter is designed to correct the tracking trajectory as the case...
Mathematical models of cardiac action potential (AP) dynamics are useful for studying the formation of dynamically significant patterns such as alternans and conduction block. A closed-loop observer is an augmented version of a mathematical model, in which experimental data are supplied to the model through feedback. In this study, tools for observer analysis were applied to a two-variable Karma model...
Application of state variables in description of linear and non-linear dynamic systems brings many advantages therefore that description is frequently used in modeling and simulation. For digital simulation using PC such system needs fundamental matrix for chosen sampling interval to be calculated. Such calculation, which uses finite number of input elements from infinite sequence, is therefore biased...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.