Economic load dispatch (ELD) is an important optimization task in power system. It is the process of allocating generation among the committed units such that the constraints imposed are satisfied and the energy requirements are minimized. There are three criteria in solving the economic load dispatch problem. They are minimizing the total generator operating cost, total emission cost and sched...

Economic Load Dispatch (ELD) is an important optimization task in power system operation for allocating generation among the committed units such that the constraints imposed are satisfied and the operating cost is minimized. This paper presents an application of Particle swarm optimization (PSO) technique to solve non-liner, non-convex ELD problem for the determination of the global or near gl...

from may 1994 to december 1996 thirty patients received viable fresh aortic homografts. mean age was 55 years (13 to 70), male to female ratio was 2/1, 24 operations were elective whereas 6 were semiurgent. predominant lesions were aortic stenosis or regurgitation in lb patients, aortic valve endocarditis in 10, prosthetic valve dysfunction in 3, and aortic root pathology in one patient. from t...

This paper gives a new modified technique for evaluating non-convex economic dispatch (NCED) problem having non-linear, discontinuous cost function. This new particle swarm optimization technique incorporates time varying acceleration coefficients (NPSOTVAC). The highly non-linear cost function due to ramp rate limit, prohibited operating zones and valve point loading effect is considered in th...

Inverse Transient Analysis (ITA) is a powerful approach for leak detection of pipelines. When the pipe transient flow is analyzed in frequency domain the ITA is called Inverse Frequency Response Analysis (IFRA). To implement an IFRA for leak detection, a transient state is initiated in the pipe by fast closure of the downstream end valve. Then, the pressure time history at the valve location is...

An important criterion in power system operation is to meet an efficient approach for solving economic dispatch (ED) problems with non convex cost functions using particle swarm optimization (PSO). Although the Particle Swarm Optimization (PSO) approaches have several advantages suitable to heavily constrained non convex optimization problems, PSO framework employing chaotic sequences combined ...

IMPORTANCE The stairstep graft is a novel method to modify the lateral anchoring point of lateral grafts for nasal valve correction. OBSERVATIONS Eight consecutive patients with a diagnosis of nasal valve collapse were included in the study. The novel method of stairstep grafts was performed to reinforce the lateral crus and to widen the nasal valve. Postoperative evaluations were performed b...

Generally, a major power system problem is dynamic economic dispatch problem (DEDP) for multiple fuel power plants. This problem is a nonlinear and nonsmooth optimization problem when multi fuel effects and valve-point effects are considered. In this contribution, Improved Radial Basis Function Network (IRBFN) and Weighted Probabilistic Neural Network (WPNN) are compared and employed to forecas...