the cuckoo search algorithm is a recently developedmeta-heuristic optimization algorithm, which is suitable forsolving optimization problems. to enhance the accuracy andconvergence rate of this algorithm, an improved cuckoo searchalgorithm is proposed in this paper. normally, the parametersof the cuckoo search are kept constant. this may lead todecreasing the efficiency of the algorithm. to cop...

Objectives: Parental responses to children’s negative emotions play a key role in developing emotional competence. Poor emotional competence has been linked to disruptive behavior problems in children. The Tuning in to Kids program is a new emotion-focused parenting intervention for preschoolers. The Tuning in to Kids aims to improve children’s behavior by changing mothers’ em...

The enormous and growing complexity of today's high-end systems has increased the already significant challenges of obtaining high performance on today's equally complex scientific applications. Application scientists are faced with a daunting challenge in tuning their codes to exploit performance-enhancing architectural features. The Performance Engineering Research Institute (PERI) is working...

Self-* systems are self-organizing, self-configuring, self-healing, self-tuning and, in general, selfmanaging. Ursa Minor is a large-scale storage infrastructure being designed and deployed at Carnegie Mellon University, with the goal of taking steps towards the self-* ideal. This paper discusses our early experiences with one specific aspect of storage management: performance tuning and projec...

Neurons that sustain elevated firing in the absence of stimuli have been found in many neural systems. In graded persistent activity, neurons can sustain firing at many levels, suggesting a widely found type of network dynamics in which networks can relax to any one of a continuum of stationary states. The reproduction of these findings in model networks of nonlinear neurons has turned out to b...

During the past several years fuzzy control has emerged as one of the most active and fruitful areas of research in the field of control engineering especially, in the realm of industrial processes. Fuzzy control, based on fuzzy logic is a logical system which incorporates human thinking rather than traditional analytical methods. Therefore, this paper aims to explore the utility of this contro...

A simple and new procedure has been developed for the PI controller tuning of an unidentified process using closed-loop responses. The method requires only one step test in the closed-loop system to obtain the proportional gain and integral time. The step test is a setpoint change performed with a proportional only controller while disabling any integral and derivative action. From the setpoint...

Multivariable liquid level control is essential in process industries to ensure quality of the product and safety of the equipment. However, the significant problems of the control system include excessive time consumption and percentage overshoot, which result from ineffective performance of the tuning methods of the PID controllers used for the system. In this paper, fuzzy logic was used to t...

In this paper a new methodology for the improvement of regulation performances of PID controllers, tuned according to the concept of Internal Model Control, is presented. Basically, it consists of adding to the PID output, when no change of the set-point is required, a value that depends on the difference between the system output and the PID output itself. In this way the load disturbance reje...

A 3-phase current controlled sinusoidal oscillator, tunable over a wide range of frequencies is presented. The oscillator comprises a ring of 3 cascaded differential Gm C low-pass filter stages, implemented in a fully translinear, NPN-only circuit. Closed-form analytical expressions are derived to quantify both frequency and amplitude tuning, as a function of two current biases. Experimental re...