Diagnosis of epileptic seizure from EEG signals by least squares method

Altıntop, Çiğdem Gülüzar; ŞENTÜRK, Tuğba; Latifoğlu, Fatma

doi:10.1109/tiptekno.2017.8238062

Cited by 1 publication

(1 citation statement)

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“…In [16], calibration of the roadside camera employed in traffic surveillance systems was accomplished on the basis of the least squares optimization method, which involved camera-intrinsic parameters and rotation angles. In [17], for anticipating the epileptic seizure via EEG signals in epileptic individuals suffering from unexpected and momentary electrical deterioration in the brain, fitting of the EEG signals filtered through singular spectrum analysis into the exponential curve was carried out using the NLS method. Statistical examination of the features extracted from exponential curves assists in diagnosis.…”

Section: Introductionmentioning

confidence: 99%

Optimized Digital Controllers for Switching-Mode DC-DC Step-Down Converter

et al. 2018

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In this paper, a nonlinear least squares optimization method is employed to optimize the performance of pole-zero-cancellation (PZC)-based digital controllers applied to a switching converter. An extensively used step-down converter operating at 1000 kHz is considered as a plant. In the PZC technique, the adverse effect of the (unwanted) poles of the buck converter power stage is diminished by the complex or real zeros of the compensator. Various combinations of the placement of the compensator zeros and poles can be considered. The compensator zeros and poles are nominally/roughly placed while attempting to cancel the converter poles. Although PZC techniques exhibit satisfactory performance to some extent, there is still room for improvement of the controller performance by readjusting its poles and zeros. The (nominal) digital controller coefficients thus obtained through PZC techniques are retuned intelligently through a nonlinear least squares (NLS) method using the Levenberg-Marquardt (LM) algorithm to ameliorate the static and dynamic performance while minimizing the sum of squares of the error in a quicker way. Effects of nonlinear components such as delay, ADC/DAC quantization error, and so forth contained in the digital control loop on performance and loop stability are also investigated. In order to validate the effectiveness of the optimized PZC techniques and show their supremacy over the traditional PZC techniques and the ones optimized by genetic algorithms (GAs), simulation results based on a MATLAB/Simulink environment are provided. For experimental validation, rapid hardware-in-the-loop (HiL) implementation of the compensated buck converter system is also performed.

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Section: Introductionmentioning

confidence: 99%