fuzzy logic

Application of a Fuzzy Particle Filter to Observe a Dynamical System States in Real Time

One of the key problems in the implementation of closed-loop control systems is to measure all states of a dynamic system, especially, when there are severe environmental conditions. Consequently, the use of certain types of sensors is impossible for technical or economic reasons. Also, in electromechanical systems, there are a lot of values that cannot be directly measured by physical sensors. Thus, mathematical algorithms named as observers and estimators are in use to calculate the states of the dynamic system utilizing math model and available set of sensors.

A novel computation for predicting time series using fuzzy logical distance connectivity function and visibility graph theory

The visibility graph is a set of locations that lie in a line that can be interpreted as a graph-theoretical representation of a time series, while the fuzzy graph speaks about the connection between the lines by accurately demonstrating the level of the connection between the objects of a given set.  Many graphs do not show proper previous values.  Even knowing the previous values of times series,  prediction of the future values will not be accurate.  Therefore, to find the real values exactly, this paper introduces the Visibility graph by time series values $(x_{t},y_{t}),(x_{u},y_{u})$

An estimation accuracy of state observers under uncertain initial conditions

A fast convergence speed of an observer helps improve the capability to track the states of a system for an arbitrary divergence between a real and an estimated initial conditions.  This property of the observers is significantly useful if a system has fast dynamics and its states change rapidly.  Thus, the convergence time is one of the main performance criteria of linear and non-linear state observers.

Neuro-fuzzy Genetic Algorithm of Optimization of Rehabilitation Therapy Plans

Proposed method of optimization of rehabilitation therapy plans using a genetic algorithm. For evaluation of alternatives generated during the optimization process, a fuzzy algorithm with neuro defazification – T-Controller, was used. Developed method tested on samples based on real plans of rehabilitation therapy.

Establishment of connections between customer demands and properties of a product using the method of QFD and FUZZY LOGIC

Now for the developed countries of the world community is inherent to ensure quality by organizational and management measures, namely development, implementation, certification and continuous improvement of quality systems. Proceedings of the outstanding scientists of the twentieth century W. Shewhart, W. E. Deming, Joseph M. Juran (first introduced the concept of “quality control”), F. Crosby, K. Ishikawa, Armand V. Feigenbaum, H. Taguchi, T. Seyfi formed a modern strategy based on the application of quality management systems (QMS).

Intellectual Vertical Handover Algorithm in Heterogeneous Mobile Network Based on Cloud Technology

In this work has been increased quality of service in mobile systems based on efficient network and radio utilization of resources of heterogeneous network and optimal procedure of intellectual vertical handover based on cloud technology and fuzzy logic. Thus a novel network selection mechanism using intelligent agents has been proposed, which select the best network based on QoS parameters uses theory of fuzzy sets.

Information technology of web-resources management based fuzzy logic

The method of content management as its life cycle stage based on fuzzy logic is proposed. The method of content management describes the commercial Web resources forming and automation technology that simplifies the content management. Ways and procedures of project decision making in management of commercial web-projects under conditions of incomplete and inaccuracy of some are described in the paper. Principal factors of project decision making were analyzed, reasons and nature of project characteristics of incomplete and inaccuracy are defined.

Спеціалізоване програмне забезпечення інтерактивної комп'ютеризованої системи

Описано функціональну структуру та особливості розробленого спеціалізованого програмного забезпечення інтерактивної комп’ютеризованої системи корекції стану користувача зі зворотним зв’язком.

Influences of standard linear forms on characteristics of dynamic system with fuzzy modal controller

On the example of two-mass fuzzy control system the influence of characteristic polynomial’s roots on the characteristics of a dynamic system is investigated. The conclusions about the advisability of setting controller to the appropriate standard linear forms depending on the size of the error of system’s output coordinate.

Investigation of the defuzzification method influence on characteristics of the system with takagi-sugeno fuzzy controller

A dynamic system that consists of two subsystems is considered. The influence of defuzzification method on quality indicators of the system is investigated. A comparison of the main defuzzification methods is held