An analytical and experimental investigation of the Lamb wave mode tuning with piezoelectric wafer active sensors (PWAS) is presented. The analytical investigation assumes shear lag transfer of tractions and strains. Analytical solution using the space-wise Fourier transform is reviewed and closed form solutions are presented for the case of ideal bonding (i.e., load transfer mechanism localize...

Approximate query answering systems provide very fast alternatives to OLAP systems when applications are tolerant to small errors in query answers. Current sampling-based approaches to approximately answer aggregate queries over foreign key joins suffer from the following drawback. All tuples in relations are deemed equally important for answering queries even though, in reality, OLAP queries e...

Recently Shamsuzzoha and Skogestad proposed a proportional-integral (PI) tuning rule for a wide range of unidentified processes. The rule relies on a closed-loop setpoint response (CSR) of a process and was developed from extensive numerical experiments. This work analytically derives a similar PI tuning rule using the CSR method. Simulations indicate that the two rules perform similarly if the...

The article describes the unified approach to the tuning of the analog and digital PI controller with two-degree-of-freedom by the multiple dominant pole method for integrating plants with a time delay on the basis of D-transform. The approach is fully analytical and it enables so tuning that the servo and regulatory responses are non-oscillatory without overshoots. The uses are shown in the ex...

PID Controller is used for tuning of three constants (P,I&D).It stabilize the system by reducing oscillations and settling time. In the proposed method, new tuning rules based on the exact satisfaction of gain and phase margin specifications using proportional-integral (PI) and proportional-integral-differential (PID) type controllers are used for unstable first-order plus dead-time (UFOPDT) pr...

Many computer-based analytical models for decision-making and forecasting have been developed in recent years, particularly in the areas of economics and finance. Analytic models have an important limitation which has restricted their use: a model cannot anticipate every factor that may be important in making a decision. Some analysts attempt to compensate for this limitation by making heuristi...

In this paper we present an analytical model to predict the performance of general purpose applications on a GPU architecture. Themodel is designed to provide performance information to an auto-tuning compiler and assist it narrow the search to the more promising implementations. This work is based on the NVIDIAGPUs using CUDA (ComputeUnified Device Architecture). We analyze each CUDA kernel an...