Portfolio

Wei-Chia (Ann) Chen

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Acoustic Physicist UX Designer

I have more than five years of pioneering experience of

Hello!

acoustics and vibration including microphone simulation, testing and signal processing plus hands-on experience with COMSOL, MATLAB, CUDA and C.

Contents

1 Publications

2 Industrial Projects

Journal of Applied Physics

Acoustics Modeling

Physicist

Physicist

Human-Computer Interaction International

Coupon Assistant WaDi+

UX designer

UX designer

Australia on Computer-Human Interaction UX designer

3 Academic Projects

4 Press

Plasma Simulation with CUDA

Open Speech for Voice Interface Portal Conference

Physicist

Problem Solver

Publications

Self-excited multi-scale skin vibrations probed by optical tracking micro-motions of tracers on arms

Journal of Applied Physics

It is found that, in proximal regions far from the radial artery, the vibrations are the global vibrations of the entire forearm excited by remote sources, propagating through the trunk and the limb. The spectrum is mainly composed of peaks of very low frequency motion (down to 0.05 Hz), low frequency respiration modes, and heartbeat induced modes (about 1 Hz and its harmonics), standing out of the spectrum floor exhibiting power law decay. The nonlinear mode-

mode coupling leads to the cascaded modulations of higher frequency modes by lower frequency modes. The nearly identical waveforms without detectable phase delays for a pair of signals along or transverse to the meridian of regions far away from the artery rule out the detectable contribution from the propagation of Qi, some kind of collective excitation which more efficiently propagates along meridians, according to the Chinese medicine theory.

Finding Suitable Candidates: The Design of a Mobile Volunteering Matching System Wei-Chia Chen1, Yun-Maw Cheng1, Frode Eika Sandnes2, and Chao-Lung Lee1 1Department 2Department

Human-Computer Interaction 2011 International 1.24 k downloads 11 citations

of Computer Science and Engineering, Tatung University, Taiwan of Computer Science, Oslo University College Norway

It can be difficult to get started with voluntary work for potential volunteers (PVs). Moreover, it is difficult to find and recruit suitable candidates for nonprofit organizations. To help solve this problem we designed a mobile matching prototype that enables an organization to actively promote ongoing volunteer activities with the need of recruitment through their bubble icons on an instant map. In the other end, PVs can easily get started by monitoring the colors of the icons and tap the ones which match their interests. This allows them to read about developing threads and browse the corresponding activities. The system is evaluated by interviewing two organization managers and three volunteers.

On the Implications of Sense of Control over Bicycling: Design of a Physical Stamina-Aware Bike Chao-Lung Lee1, Da Lee1 , Yun-Maw Cheng1 , Li-Chieh Chen2, Wei-Chia Chen1, Frode Eika Sandnes3 1Dept.

Australia on Computer-Human Interaction OZCHI 2010 International

of Computer Science and Engineering, of Media Design, Tatung University, Taiwan 3Dept. of Computer Science, Oslo University College, Norway 2Dept.

The mobile is laced at bike stem; it senses acceleration data when bicycling, and infers terrain and stamina cost.

Bikers utilize these data to infer the possible stamina cost and quality of

surroundings. This supports them to make a better decision. This study assumes that fitness level indexed by stamina cost could enhance a biker's sense of control. The prototype in this paper was developed to provide stamina cost information, which is inferred from the terrain patterns of a biking route. In the system evaluation, participants took a positive attitude toward this prototype and approved the

importance of stamina cost feedback.

System prototype: stamina map and user state visualizations.

Industrial Projects

Modeling of Capacitive MEMS Microphone And Its Waveguides with COMSOL and MATLAB for Mobile Device Applications Wei-Chia Chen1 1Fortemedia Inc, USA Taiwan Branch

Acoustics Modeling

Waveguide

Microphone

Normalized Sensitivity [dB]

MEMS Microphones

20

Simulation

15

Measurement

10 5 0 -5 -10 -15 10

100

1000 Frequency [Hz]

10000

Modeling of Capacitive MEMS Microphone Sensor with Lumped Element Model Wei-Chia Chen1 1Fortemedia

Inc, USA Taiwan branch

Acoustics Modeling MEMS Microphones

Vent Resistance 𝑹𝒂,𝒗 𝒑𝒊𝒏 Sound Pressure

9𝜌ℎ𝑑 5𝜋𝑎𝑑2

Top backplate 72𝜇ℎ𝑏𝑝1 12𝜇 𝑹𝒂,𝒃𝒑𝟏 = 𝐵 𝐴 + ; 𝑟,𝑏𝑝 𝜋𝑁1 𝑔3 𝜋𝑎ℎ4 𝑁1 1 1 3 1 1 𝐵 𝐴𝑟,𝑏𝑝 = ln − + 𝐴𝑟,𝑏𝑝 − 𝐴2𝑟,𝑏𝑝 4 𝐴𝑟,𝑏𝑝 8 2 8 Diaphragm

𝑴𝒂,𝒅

128𝜇𝐿𝑒𝑓𝑓

𝜋𝐷𝑣4

𝑪𝒂,𝒅 𝟏: 𝒏

Back Cavity Compliance

𝑪𝒂,𝒄𝒂𝒗 =

𝑉 𝜌0 𝑐02

𝜋𝑎𝑑6 1 − 𝜈 2 16𝐸ℎ𝑑3

Turn ratio 1 𝑎𝑑4 𝑉𝐵 − 3 64𝐷𝑟 𝑔

Coupon Assistant WaDi+

Academic Projects

Dusty plasma - 2D Coulomb cluster Wei-Chia Chen1, I Lin 1Department

CUDA programming

of Physics, National Central University, Taiwan

˙ 1≤𝑗≤𝑁 ¨ 𝑥𝑖

= −𝑘𝑥𝑖 −

˙ 𝛾𝑥𝑖

+ 𝑗≠𝑖

𝑥𝑖𝑗 + 𝜂(𝑥𝑖 , 𝑡) 𝑟𝑖𝑗2 ˙

1≤𝑗≤𝑁 ¨ 𝑦𝑖

= −𝑘𝑦𝑖 −

˙ 𝛾𝑦𝑖

+ 𝑗≠𝑖

𝑦𝑖𝑗 + 𝜂(𝑦𝑖 , 𝑡) 𝑟𝑖𝑗2

256 particles calculation processing time 1500 20 mins 1200

900

600

More powerful than pc clusters with 64 nodes

70x

300 18 secs

0 CPU

GPU

Press

Opening Speech at a Product Launch

Thank You!