It is well known that the nonblocking supervisory control problem is NP-hard, subject in particular to state space explosion that is exponential in the number of system components. In this paper we propose to manage complexity by organizing the system as a State Tree Structure (STS). STS are an adaptation of state charts to supervisory control theory. Based on STS we present an efficient recurs...

an enhanced displacement feedback structural control procedure is presented for performance-based design in this paper. at first, a comparative study is implemented assessing three most common active control algorithms including state, acceleration, and displacement feedback controls. the advantage of the displacement feedback algorithm for active control of structures against earthquakes is de...

In this Keynote Lecture, first a novel wavelet-hybrid feedback least mean square (LMS) algorithm is presented for robust control of civil structures through adroit integration of a feedback control algorithm such as the LQR or LQG algorithm, the filtered-x LMS algorithm, and wavelets. Next, a new hybrid control system is presented through judicious integration of a passive supplementary damping...

Koza has previously shown that the power of a genetic programming system can often be enhanced by allowing for the simultaneous evolution of a main program and a collection of automatically de ned functions (ADFs). In this paper I show how related techniques can be used to simultaneously evolve a collection of automatically de ned macros (ADMs). I show how ADMs can be used to produce new contro...

Software agents have shown considerable promise in many fields. Thus, control structures for such software agents raise important research issues. This thesis goals are (1) to design control structures for software agents, (2) to solve real world problems with these models, and by doing this, (3) to discover some principles of control mechanisms of software agents. Therefore, the major question...

0.1 Challenge 1 If we consider that G(x, t) and W (x, t) are harmonic functions in time, then there exist functions g(x) and w(x) such that G(x, t) = g(x) cos(ωt) and W (x, t) = w(x) cos(ωt). Reeplacing these two expressions in the problem (1), we have that −ω2w(x) cos(ωt)− c2w′′(x) cos(ωt) = g(x) cos(ωt), which implies that −ω2w(x) − c2w′′(x) = g(x). On the other hand, the function W (x, t) sa...

. The research reported here is the result of an investigation of several aspects of the control structure of programming languages. By control structures we mean _ • programming environments or operations which specify the sequencing and interpretation rules for programs or parts of programs. This dissertation attempts to demonstrate the thesis: complexity diminishes and clarity increases to a...

This study aims at investigating the effects of cooperative language learning on learning active and passive structures among Iranian EFL students. The participants of the study were 60 high school students that were selected from third grade of Barikbin high school in Qazvin. All of the participants were male. Their level of proficiency was intermediate. Then the participants were divided into...