TitleWave Phenomena in the Cochlea: from Micro- to Macro- Mechanics

SpeakerYi-Wen Liu, Ph.D. Associate Professor,

Electrical Engineering department of National Tsing Hua University (NTHU), Hsinchu, Taiwan

Time10:00-11:30, March 23rd, 2016

Place: 微电子楼401会议室

HostWang Guoxing

 

Abstract:
Mammalian hearing (including humans) is sensitive to signals as weak as 10e-17 Watt. It was found that "outer hair cells", a special kind of sensory cells located inside the cochlea, are responsible for amplification of acoustic signals. These cells can convert mechanical energy and electrical energy in both directions, thus forming a positive feedback loop that acts as an amplifier for the traveling waves. However, it is still debatable how exactly this electro-mechanical feedback happens at the cell level. My on-going research is to construct dynamic-system models to simulate nonlinear responses of both normal and pathological ears. In this talk, I will first highlight important experimental findings in cochlear mechanics during the past 20 years or so. Then, I will present my work on modeling the micro- and macromechanics of the cochlea, and development of numerical methods thereof, so as to investigate the generation mechanisms for otoacoustic emissions (namely, sounds coming from the ear).

 

Short Bio: 

Yi-Wen Liu obtained his B.S. degree from National Taiwan University in 1996, and an M.S. and then Ph.D. from Stanford University in 2000 and 2006, respectively, in Electrical Engineering. From 2006 to 2010, he joined Boys Town National Research Hospital as a research engineer, participating in two different NIH-granted research projects. In Feb. 2010, Dr. Liu joined the Electrical Engineering department of National Tsing Hua University (NTHU) in Hsinchu, Taiwan, where he presently serves as an associate professor. Dr. Liu's research interests mainly focus on hearing science and audio and speech signal processing. He is also an amateur pianist and has performed at NTHU's New Year Party in 2015.

 

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