During the monitoring of information systems, experiments in progress, etc. it is often required that people are alerted about some events in real time, preferably via a mobile phone. Modern smartphones offer advanced...
详细信息
During the monitoring of information systems, experiments in progress, etc. it is often required that people are alerted about some events in real time, preferably via a mobile phone. Modern smartphones offer advanced means of notification, however these techniques are usually vendor specific. In this paper we design an unified platform for the delivery of short messages and notifications to smartphones. Our solution is based on a RESTful Java Web Service with simple interface and secure access. Although it is primarily targeted for the delivery of iOS Push Notifications, it can be easily extended for other platforms and/or transport methods (Android, SMS messaging, etc.).
In this paper the relationship between one-sided concept lattices and their restricted version is described. One-sided concept lattices are based on the Galois connections within Formal Concept Analysis (FCA) framewor...
详细信息
In this paper we describe use of cloud computing platform for support of distributed creation of conceptual models based on the FCA (Formal Concept Analysis) framework. FCA is one of the approaches which can be applie...
详细信息
This contribution aims a revision and extension of the ring of retarded quasipolynomial meromorphic functions (RMS) for description and control of time-delay systems (TDS). The original definition has some significant...
详细信息
This contribution aims a revision and extension of the ring of retarded quasipolynomial meromorphic functions (RMS) for description and control of time-delay systems (TDS). The original definition has some significant drawbacks - especially, it does not constitute a ring. Our new definition extends the usability to neutral TDS and to those with distributed delays. As first, basic algebraic notions useful for this paper are introduced. A concise overview of algebraic methods for TDS follows. The original and the revised definitions of the ring together with some its properties finish the contribution. There are many illustrative examples that explain introduced terms and findings throughout the paper.
The paper presents the technical infrastructure of the system for monitoring the road transportation of oversized and dangerous goods. It describes the basic components of the system - vehicle sensor network, vehicle ...
详细信息
The paper presents the technical infrastructure of the system for monitoring the road transportation of oversized and dangerous goods. It describes the basic components of the system - vehicle sensor network, vehicle on-board unit (OBU), monitoring centre and wireless communication system. Moreover, it specifies some important system parameters, especially the period of sending the data about the state / condition of goods to the monitoring centre.
The object of this work is to highlight, on a physical coupled tanks system, the performances of a digital design of a continuous-time passivity based controller. The design considers the sampled-data model of the pla...
详细信息
The object of this work is to highlight, on a physical coupled tanks system, the performances of a digital design of a continuous-time passivity based controller. The design considers the sampled-data model of the plant and provides better results compared to the emulations of given continuous-time controllers. A two-state continuous-time non-linear model is used to design the digital controller. A feedback passivating controller is developed in continuous-time from a suitable choice of the storage function V. The results show good performances of the controller when increasing the sampling period or the controllers gain.
Although the invention of the special wheels that move omnidirectional vehicles dates back to the seventies, advances in mechatronics, and control technology keep them constantly on the drawing table of engineers work...
详细信息
Although the invention of the special wheels that move omnidirectional vehicles dates back to the seventies, advances in mechatronics, and control technology keep them constantly on the drawing table of engineers working with mobile robots. The need for eliminating human error becomes ever so obvious when human operators are managing expensive and/or powerful machinery, as the cost of failure can be very high. Omnidirectional platforms are not immune to human error either, however due to their unique working principle they require customized methods. This article presents a trajectory controller for omnidirectional transport robots that is able to correct their trajectory during braking even when high disturbances are present. A method for tuning the controller to achieve a desired behavior is presented. The results are demonstrated by simulation, in Modelica -Dymola environment.
The frequency estimation technique with guaranteed finite time of convergence to a given accuracy of identification is presented. The approach for a high frequency noise rejection is proposed. The possibility of switc...
详细信息
The frequency estimation technique with guaranteed finite time of convergence to a given accuracy of identification is presented. The approach for a high frequency noise rejection is proposed. The possibility of switching algorithm introduction for estimation quality improvement is discussed. The proposed solution has order three, that is smaller than in other existent solutions. The dimension of modified robust frequency estimator that can reject the additional measuring noise is equal four. Efficiency of the approach is demonstrated on examples of computer simulation.
We design the output feedback controller for a class of nonlinear systems with a state delay, structural and external disturbances. The external perturbation is bounded. Structural disturbance means the unmodeled and ...
详细信息
ISBN:
(纸本)9781467345033
We design the output feedback controller for a class of nonlinear systems with a state delay, structural and external disturbances. The external perturbation is bounded. Structural disturbance means the unmodeled and unknown stable dynamics in the control loop. In this paper we consider the problem of exponential stability for disturbed systems which can be represented as a feedback connection of a linear dynamical system with unknown parameters and a uncertain nonlinearity satisfying a sector constraint. Proposed approach is extended for the case of unknown relative degree of the system by modification of the control law.
Neural networks as universal approximators possess capability to model complex nonlinear phenomena. However, when almost nothing is known about the modeled dynamic process it is difficult to determine important parame...
详细信息
Neural networks as universal approximators possess capability to model complex nonlinear phenomena. However, when almost nothing is known about the modeled dynamic process it is difficult to determine important parameters like the number of neurons or the size of regressor vector (dynamic order). In order to avoid suboptimal settings for a dynamic model using trial-and-error method, genetic algorithm is used for optimizing the neural dynamic model. To improve the results even more, the genetic optimization is hybridized with a local optimizer in the form of Levenberg-Marquardt algorithm commonly used for neural network training. Here a neural model of biomass-fired boiler emissions is considered, which is eventually intended for predictive control. Series-parallel NARX model is used with two hidden layer neural network and tan-sigmoid transfer functions. The simpler neural model structure will be computationally less expensive what is important for online predictive control. The results confirm the capability of this method to achieve simpler network structures with errors comparable to the case when trial-and-error settings were previously used.
暂无评论