Luis Montejo

Professor.
University of Puerto Rico at Mayaguez.

[Peyman Milanfar @docmilanfar]

surprising fact: for any random variable x,

| mean(x) - median(x) | ≤ std(x)

It’s not hard to show

|μ - m| = |E(X - m)| ≤ E|X - m|
≤ E|X - μ| = E√(X - μ)²
≤ √ E(X - μ)²
= σ

originally appeared in a paper by Hotelling & Solomons Annals of Mathematical Statistics 1932

[Luis Montejo @Monteviside]

Engineers performing seismic analyses of nuclear facilities:
Generation of response spectrum compatible records satisfying a minimum power spectral density function.
Open access: https://t.co/iXtKQOLeNk
Python code: https://t.co/r1AJAEuBHq
Video: https://t.co/OruovROoM6

[Luis Montejo @Monteviside]

Legalize Math

[Garry Tan @garrytan]

We need to legalize math in California

Today the anti-math education bureaucrats are trying to force the UC system to water down math standards to accept fake data science courses that don’t teach algebra

We interviewed @minilek, CS division chair @ Berkeley to get the low down

[Luis Montejo @Monteviside]

Still facing widespread power outages in Puerto Rico. 24 hours after a major blackout, half of the island remains without electricity.

[Luis Montejo @Monteviside]

background:
original article: https://t.co/qPpG0SLnjO
applications to near-fault pulse motions: https://t.co/W0ciHP1oLv
Lear about the effect on bi-directional lateral demand of SDOF systems https://t.co/s6EHnSUn4m and multi-story RC buildings https://t.co/fbxrdSpsGH

[Luis Montejo @Monteviside]

Attention earthquake engineers! My code for performing spectral matching of 2 horizontal components to a RotDnn target spectrum has been revamped.
Download the updated code: https://t.co/YRHbfgGMqX
See the updates in action: https://t.co/6Stjn5DLb7

[Luis Montejo @Monteviside]

12 hours and counting... Puerto Rico is still grappling with a widespread blackout

[Luis Montejo @Monteviside]

Strong-Motion-Duration-Dependent Power Spectral Density Functions Compatible with Design Response Spectra.
open access: https://t.co/UiQ6B6kZEm
video: https://t.co/GUmgLrF8OO
#earthquake #nuclear

[Luis Montejo @Monteviside]

Engineers performing seismic analyses of nuclear facilities! 🚨
I've released an update to my code for calculating PSDs compatible with a design response spectrum. 🚀 This new version is significantly faster: https://t.co/vobyOz3BTc

[Luis Montejo @Monteviside]

Diciembre 7 2024. 11.40PM. San Juan, PR. @Residente

[Prof. Feynman @ProfFeynman]

Students don't need a perfect teacher. Students need a happy teacher, who's gonna make them excited to come to school and grow a love for learning.

[Operador Nuclear @OperadorNuclear]

Número de reactores nucleares en funcionamiento por país (noviembre de 2023).

Fuente: https://t.co/LUaI3kNXqD

[Luis Montejo @Monteviside]

it's real!
https://t.co/MaZqzcvRm5

[Luis Montejo @Monteviside]

Strong-Motion-Duration-Dependent Power Spectral Density Functions Compatible with Design Response Spectra.
open access: https://t.co/UTIGevFLn5
get the code: https://t.co/vobyOz343E
video: https://t.co/GUmgLrEAZg
#python #numpy #matplotlib

[Operador Nuclear @OperadorNuclear]

La central nuclear de Cofrentes, que este lunes cumple 40 años, genera anualmente el 45% de la energía producida en la Comunitat Valenciana, lo que supone el equivalente al consumo de más de dos millones de hogares, mientras sigue vigente su cierre previsto para 2030.

La instalación se encuentra en la mejor condición en la matriz del Sistema Integrado de Supervisión de Centrales, de acuerdo con los datos del Consejo de Seguridad Nuclear.

Cofrentes presenta un factor de disponibilidad cercano al 90%, cifra que la convierte en una de las centrales más fiables de su tecnología a nivel mundial. Las centrales de referencia tecnológica de Cofrentes están extendiendo su vida hasta los 60 años, o incluso hasta los 80 años en Estados Unidos.
https://t.co/DAlopu1mMh

[Luis Montejo @Monteviside]

Matching two earthquake horizontal components simultaneously to a target RotD100 spectrum
https://t.co/IrJYsNAntO

[John Morales @JohnMoralesTV]

I've already written about this, but here is another example of how a 7-day Tropical Weather Outlook (TWO) is just slightly above throwing spaghetti against a wall to see what sticks. The TWO on the left is from 5 days ago, followed by the one today. Can we say we have the skill?

[Luis Montejo @Monteviside]

History and future of direct displacement based design 👇🏾

[Mervyn Kowalsky @MJKowalsky]

It's been a while since I've posted, and thought I'd take the opportunity to share a link to a video we made based on a recent paper presented at 18wcee on Displacement Based Design. More videos based on our publications will follow!
https://t.co/ZpImQgQiGg

[Luis Montejo @Monteviside]

👇🏼 applies to everything

[Yi Ma @YiMaTweets]

Don't believe anyone who tells you that we do not need to understand large and deep models. Just because he/she cannot, does not mean it couldn't. As Feynman said, "What I cannot create, I do not understand." So, we'd better understand what we have created. Blackbox is not an option.

[Luis Montejo @Monteviside]

M7.4 Hualien City, Taiwan – via USGS earthquakes:
epicenter (*), finite fault (grid), PGV contours, population density (grays)