The DementiaBank Acoustics Project is a working title for an acoustic-only challenge for AD detection. This document serves as the lab notebook for this project.

This project will attempt to replicate some of the results of Wang 2019 and Martinc 2021, but focusing on minimizing human involvement; we will first work on raw transcript classification with ERNIE (cutting all CHAT annotations), then introduce pause-encoding in a manner similar to Yuan 2021 which is automated by MFA. Goal is to replicate the results of Yuan 2021/or even Martinc 2021 in a completely automated manner.

• Pallas Tutorial Notes
• Jax Feature Releases
• CudaTile

Divide by \(2\pi\), or, how I learned to start worrying and hate Fourier Transforms.

Hello all. Good news first: our frequency theory is now correctly validated by data.

If you want a band-aid for the answer, here it is: divide everything we get out of the cantilever equations by \(2\pi\); then, use the correct linear mass density: our Google sheets was off by a factor of almost \(4\) because of later-corrected apparent measurement error.

We have a system of differential equations:

\begin{equation} \begin{cases} \dv{I}{t} = -0.73 U(t) + 0.0438 + 0.4 \dv{M}{t} \\ \dv{U}{t} = 0.4I-0.012 \\ \dv{G}{t} = \dv{M}{t} - I(t) \end{cases} \end{equation}

where, \(M\) is a sinusoidal function which we can control.

We hope for this system to be as stable as possible.

First, let’s try to get a general solution of the system. The linearized(ish) solution takes the shape of:

\begin{equation} \dv t \mqty(I \\ U \\ G) = \mqty(0 & -x_1 & 0 \\ x_4 & 0 & 0 \\ -1 & 0 & 0 ) \mqty(I \\ U \\ G)+ \dv{M}{t}\mqty(x_3 \\ 0 \\ 1) + \mqty(x_2 \\ x_5 \\ 0) \end{equation}

A reading: (Krugman 2009)

Reflection

The discussion here of the conflict between “saltwater” and “freshwater” (Keynesian and Neoclassical) economists is very interesting when evaluated from the perspective of our recent impending recession.

One particular statement that resonated with me in the essay was the fact that a crisis simply “pushed the freshwater economists into further absurdity.” It is interesting to see that, once a theory has been well-established and insulated in a community, it becomes much more difficult to parcel out as something that could be wrong.