Invited Talks

Prof. Brian Lithgow

University of Manitoba, Monash Alfred Psychiatry Research Center

Speech Title: Electrovestibulography: A methodology utilizing electrophysiological measures to determine Depression type

Abstract: Depression affects about 20% of the population. Depression manifests in two main forms Bipolar Disorder (BD) and Major Depressive Disorder (MDD). At first consultation about 40% of BD patients are misdiagnosed, often as MDD. Giving the wrong medication to a depressive BD patient can produce Mania (significantly increasing risky behaviour including suicide etc.). Current techniques can take years to detect MDD from BD (particularly type II BD). Electrovestibulography (EVestG) can detect physiological differences at first consultation enabling identification of BD from MDD. For Biomedical Engineers it is critical to understand the underlying physiology in order to achieve optimal instrumentation and methodological design. This talk will introduce the methodology of EVestG, the complex Morel wavelet analysis of phase analysis used on the recordings then, using the Depression data, demonstrate relationships between the EVestG features, used to separate BD and MDD, and the underlying Depression physiology.

Bibliography: Professor Brian Lithgow is currently the Leader of the Diagnostic and Neurosignal Processing Research Groups at the Alfred Hospital (Melbourne, Australia) and Riverview Health Centre (Winnipeg, Canada). He is also a Senior Research Fellow at the Alfred Hospital and Research Affiliate at Riverview Health Center. His appointments include Adjunct Professor at the University of Manitoba, Canada and Adjunct Assoc. Professor at Monash Alfred Psychiatry Research Center. He founded the Monash University Centre for Biomedical Engineering (MUCBE) and was the Director of Teaching for MUCBE from 2001-2010.

Recent Research: Diagnostics development for neurological and neurodegenerative disorders: Dementia, Parkinson’s Disease, Vertiginous Disorders, Post-concussion syndrome, Bipolar disorder and Major Depressive disorder (4 patents).

  • The successful quantitative separation of unipolar and bipolar depression is a world first.
  • Current research aims at separating Dementia types and predicting treatment efficacy.
  • An animal study is looking at modelling of vestibular electro-neurophysiology.

Publications: (>130 refereed publications, 6 books, 2 book chapters, 5 patents).

A/Prof. Montree Siripruchyanun

King Mongkut’s University of Technology North Bangkok

Speech Title: A Low-voltage Current-mode Electronically controllable Four-quadrant Zero/Span Circuit

Abstract: An improved current-mode four-quadrant zero/span circuit is discussed. The circuit structure is based on CMOS current amplifier and 4 diodes, without any resistor. The proposed circuit has advantage in such low-voltage architecture biased with as low as ±0.5V power supply. It can generate four-quadrant outputs, without any changing structure. Additionally, its zero and span levels can be independently tuned by electronic method though relative bias currents, where a low-offset output current can be achieved. The total power consumption is approximately 10µW, much lower than a traditional one. Simulation results are investigated, it offers good performances of the proposed circuit as depicted.

Bibliography: Montree Siripruchyanun received the B. Tech. Ed. degree in Electrical Engineering from King Mongkuts University of Technology North Bangkok (KMUTNB), the M. Eng. and D. Eng. degree both in electrical engineering from King Mongkut’s Institute of Technology Ladkrabang (KMITL), Bangkok, Thailand, in 1994, 2000 and 2004, respectively. He has been with Faculty of Technical Education, KMUTNB since 1994. Presently, he is with Department of Teacher Training in Electrical Engineering as an Associate Professor, KMUTNB. His research interests include analog–digital communications, analog signal processing and analog integrated circuit. He is a member of IEEE (USA), IEICE (Japan), and ECTI (Thailand).

A/Prof. Krit Angkeaw

King Mongkut’s University of Technology North Bangkok

Speech Title: Design of LQR Controller Using FPAA for Magnetic Levitation Control System

Abstract: This paper presents the analog circuits was necessary in many fields of technology, including control systems. The analog circuits were used to build many types of controller, but in controller design, synthesis of analog circuits was difficult. Because of its difficulty, most analog controllers have been replaced by digital controllers. Currently, the field programmable analog arrays (FPAA) are processors for analog signal equivalents to the digital processors FPGA. Effective controller design and synthesis of analog circuits can be achieved easily using the FPAA. Consequently, the FPAA is applied to this project to design and synthesize an enhanced controller. An optimal controller, LQR as an example requires precise controller gain to obtain the highest performance which cannot be obtained using normal analog circuits. Moreover, using the FPAA can overcome performance degradation due to discretization in the synthesis of digital controllers. The simulation results confirm the advantages of a FPAA controller.

Bibliography: Krit Angkeaw was born in Bangkok, Thailand. He received B.Ind.Tech. degree in Electronics Engineering from Siam University Bangkok, Thailand in 1996. He received his M.Eng. and D.Eng. in Electrical Engineering from Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang (KMITL), Bangkok, Thailand in 2000 and 2009, respectively. Since 2004, he has been a faculty member of King Mongkut’s University of Technology North Bangkok (KMUTNB). He is currently an Associate Professor at Department of Instrumentation and Electronics Engineering at KMUTNB. His research interests are focusing in Analog Filter Design, Analog Signal Processing and Analog Circuit for Electronic Control.

A/Prof. Pipat Prommee

King Mongkut’s Institute of Technology Ladkrabang

Speech Title: Log-domain Sinusoidal Oscillator Circuits: Design Perspective

Abstract: This paper presents the theory and design of sinusoidal oscillator circuits. The oscillator seems to be an important subsystem as well as communication systems. Network functions are studied with the pole and zero location would be investigated. The closed-loop system is also verified in accordance with the Barkhausen stability criterion. Due to the analysis, the several techniques can be achieved the sinusoidal oscillator. Many active elements can be realized the oscillator circuits. OPAMP-RC and OTA-C are well known that can provide the oscillator sinusoidal signals. Unfortunately, low-frequency in a few hundred kHz can be produced which is not suitable for high-frequency applications. Log-domain circuit technique is verified that suitable for high frequency with its tunability feature. The sinusoidal oscillators based on log-domain technique are presented which provided the high-frequency output rather than 100kHz-100MHz by manipulating IB from 10µA to 1000µA.

Bibliography: Pipat Prommee received his B.Ind. Tech. degree in Telecommunications, M. Eng. and D. Eng. in Electrical Engineering from Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang (KMITL), Bangkok, Thailand in 1992, 1995 and 2002, respectively. He was a senior engineer of CAT telecom plc between 1992 and 2003. Since 2003, he has been a faculty member of KMITL. He is currently an associate professor at department of telecommunications engineering at KMITL. He is author or co-author of more than 70 publications in journals and proceedings of international conferences. His research interests are focusing in Analog Signal Processing, Analog Filter Design and CMOS Analog Integrated Circuit Design. He is a senior member of IEEE, USA.