نتایج جستجو برای: unknown control directions
تعداد نتایج: 1590935 فیلتر نتایج به سال:
in this thesis, we consider a mathematical model of cancer with completely unknown parameters. we study the stability of critical points which are biologically admissible. then we consider a control on the system and introduce situations at which solutions are attracted to critical points and so the cancer disease has auto healing. the lyapunov stability method is used for estimating the un...
in this paper, an adaptive fuzzy control scheme is proposed for a class of perturbed strict-feedback nonlinear systems with unknown discrete and distributed time-varying delays, and the proposed design method does not require a priori knowledge of the signs of the control gains.based on the backstepping technique, the adaptive fuzzy controller is constructed. the main contributions of the paper...
This paper addresses the problem of adaptive fuzzy tracking control for aclass of nonlinearly parameterized systems with unknown control directions.In this paper, the nonlinearly parameterized functions are lumped into the unknown continuous functionswhich can be approximated by using the fuzzy logic systems (FLS) in Mamdani type. Then, the Nussbaum-type function is used to de...
In this paper, an adaptive fuzzy control scheme is proposed for a class of perturbed strict-feedback nonlinear systems with unknown discrete and distributed time-varying delays, and the proposed design method does not require a priori knowledge of the signs of the control gains.Based on the backstepping technique, the adaptive fuzzy controller is constructed. The main contributions of the paper...
This letter studies the optimal consensus problem for a group of heterogeneous high-order agents with unknown control directions. Compared existing results, reaching an further requires point to be solution some distributed optimization problem. First, we construct signal generator reproduce global point. Then, convert into robust stabilization translated multi-agent system. Finally, present tw...
This paper is concerned with the decentralized control problem of networked high-order nonlinear systems that can be transformed into strict feedback forms parameter uncertainties and unknown directions under a directed communication graph. A controller designed recursively for each agent to realize output synchronization guarantee overall system bounded. Instead Lyapunov-based argument which c...
this study investigates the effect of teacher’s repetition as an input enhancement technique in explicit teaching of vocabulary items on efl learners’ later retrieval. to this end, 66 persian speaking english learners, aged 18 - 29, homogenized through a standard proficiency test (opt), were chosen and put into two experimental and control groups, each 33 learners. general service list (gsl), a...
the present research study attempted to find out the extent to which two pre-task activities of “glossary of unknown vocabulary items” and “content related support” assisted efl language learners with their performance on listening comprehension questions across two different proficiency levels (low and high). data for this study were obtained from a total of 120 language learners, female and m...
This paper concentrates on the study of decentralized fuzzy control method for a class fractional-order interconnected systems with unknown directions. To overcome difficulties caused by multiple directions in systems, novel Nussbaum function technique is proposed. much more general than those existing works since it not only handles single/multiple but also suitable fractional/integer-order si...
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