applied bio-mechanics lab · 2019. 4. 25. · incheon national university mechanical engineering...

Incheon National UniversityMECHANICAL ENGINEERING 응용생체역학 연구실

Applied Bio-mechanics Lab

PROFESSOR

LAB

PROJECT

Namkeun Kim

Research Interest : Applied mechanics (Biomechanics)

Education

- BS : Seoul National University (2005)- MS : Stanford University(2007)- PhD : Stanford University(2012)

Contact : nkim@inu.ac.kr (8호관 566호/+82-32-835-8868)

<Applied Bio-mechanics Lab>

8호관 B동 523호 / 032-835-4539

Researcher – MS candidates Myungjun Han

Seongho Mo

Jongwun Choi

Woonhoe Goo

Undergraduate researcher Soee Jung, Jongwoo Im

Using Software – Hyperworks / Actran / Comsol / Amira

PROJECT

Bone-conduction hearing mechanism using human 3D finite element model

What is Bone conduction?

In the human-hearing mechanisms, there are two different pathways

which are air-conduction and bone-conduction.

Through the bone conduction, the sound wave does not pass

through the middle-ear and inner ear from the sound source,

while it reaches the cochlea through the human head.

Personalized Human-middle-ear Model development

From the CT images, we develop the finite element model of the middle ear.

We considered the variation of the individual geometry of the ear.

In addition, several mechanical properties such as orthotropy and

viscoelasticity were considered to build the FE model.

Measurement of the Young’s modulus of Human Skull

In order to build a finite element model, we have to know the

mechanical properties of the components. Specifically, human

skull is the important component to determine the sound speed

in bone-conducted hearing. However, the exact Young‘s modulus

was not determined yet. We are measuring the Young’s modulus

of the human skull using a micro tensile stage, and calculating

the theoretical value of the Young’s modulus.

Modeling of the human finger for self-identification

For the purpose of self-identification, we are developing the human-finger

FE model. Corresponding to bone-conducted input through the

transducer, human finger tip shows its own unique signal according

to the individual. To clarify the theory and help to make a device,

we are developing the human-finger model composed of

mass-spring-damper mechanical systems.

A Mathematical model of a Human Cochlea

The active mechanism occurred in the human cochlea is modelled by tapered box model. Using

WKB solution, we could obtain the reasonable basilar membrane velocity considering the hair cell’s

active mechanism. In addition, the intracochlear pressure was also calculated through the model.

Object Detection from the micro CT images

In order to detect the region of interest automatically and efficiently, we are applying the deep

learning algorithm to the several micro CT image data sets. Using Faster R-CNN algorithm, we could

obtain the cochlea sections from the raw CT images. The obtained images can be reconstructed to

the 3D geometry using AMIRA software. It can be helpful to develop the FE model for individual

patients as well as medical device such as hearing aid.

Optimization for the thickness of the turbine blade

Through the FE simulation, we are optimizing the dimension of the turbine blade to perform the

best efficiency. Fluid flow is calculated through the COMSOL software according to the given

geometry. Then, the flow is applied to the blade structure. On the process, the blade geometry such

as the thickness can be optimized to show the largest rotating velocity.