Prof. Nizamettin Aydın
Istanbul Technical University, Computer Engineering Department, Türkiye
Speech Title: Complex Discrete Wavelet Transform of Nonstationary Complex Signals
Abstract:
Stroke is an illness causing partial or total paralysis, or death. The most common type of stroke occurs when a blood vessel in or around
the brain is blocked by emboli. Early and accurate detection of asymptomatic emboli is important in identifying patients at high risk of stroke.
They can be detected by Doppler ultrasound. Most Doppler systems employ quadrature demodulation resulting in quadrature signals.
Quadrature signals are based on the notion of complex numbers, widely used in many digital signal processing applications. Quadrature
signal processing is applied across various fields of science and engineering. Processing of quadrature Doppler signals provides additional
processing power by enabling simultaneous measurement of amplitude and phase of the signal. In medicine, it is primarily used to study blood flow.
This talk will present various processing methods, including Fourier and wavelet transforms, particularly complex discrete wavelet transform,
for processing quadrature embolic Doppler ultrasound signals within the context of stroke research.
Biography:
Prof. Nizamettin Aydın received BSc (1984) and MSc (1987) degrees in Electronics and Telecommunication Engineering at Yildiz Technical University, Türkiye, and PhD degree in Medical Physics (1994) at the University of Leicester, UK. He was an Assistant Professor in the Electronic Engineering Department, Gebze Technical University, Türkiye, from 1995 to 1999. He worked in the Department of Clinical Neuroscionces at Kings College London and the Division of Clinical Neuroscience at St George's Hospital Medical School as a Research Fellow between 1998 and 2001. He was a Senior Research Fellow in the Institute for Integrated Micro and Nano Systems at the University of Edinburgh from 2001 to 2004. In 2004, he was appointed as head of Computer Engineering Department and in 2006 he founded Software Engineering Department, both at Bahcesehir University, Türkiye. Between 2009 and 2023, he was a professor in the Computer Engineering Department at Yildiz Technical University and served as the head of the department between 2011 and 2023. He is now with the Computer Engineering Department at Istanbul Technical University, Türkiye. His research interests and contributions cover a wide range of subjects including biomedical signal/image processing, bioinformatics, system-on-chip, wireless communication, AI, data science, and computer science. He was awarded the IEE (now IET) the Institute Premium Award for 2000/2001 for his contributions in complex wavelet transform for processing Doppler ultrasound signals. He is a senior member of IEEE and serves as IEEE Türkiye Section Chair.