We were discussing in our department the pre-requisites for different courses in computer science, and I started wondering about the "normal progression" of students in our Computer Science bachellor's degree. We have a suggested 4 year curriculum, but hardly any students graduate in 4 years. I wanted to see …
more ...I watched a nice video today of a lecture by Rob Pike on the history of UNIX from his personal perspective. It's fun to watch stuff like this, it's different than reading about UNIX in a book or online.
I once had the opportunity to watch Linus Pauling give a …
more ...The University of Puerto Rico has a G Suite Education Edition agreement. Several researchers are interested in using Google Drive to backup and securely share data and results. We set up a Team Drive for testing in one of our projects, and it was working nicely, but one of …
more ...Last year I wrote a toy bitcoin-like python implementation for the Systems and Network Security course. This year I found a much nicer toy implementation called dumbcoin, written by Julien Rebetez. His implementation is much cleaner than mine, and includes several classes for transactions, wallets, and blocks. He illustrates mining …
more ...After Hurricane Maria hit Puerto Rico on September 20, 2017 I bought a solar panel kit. The kit had a 100 Watt solar panel (12 V), a charge controller, and cabling. I had already purchased a 1200 Watt inverter after Hurricane Irma, and pulled the battery from one of the …
more ...Saturday afternoon I had a nice ride on my longboard out on the Paseo Puerta de Tierra. I started out in Condado, by the lagoon, and followed the bike path up to Escambrón. The weather was great, and there wasn't a lot of traffic on the path. Once past Escambrón …
more ...I've been playing with scuttlebutt, a secure decentralized social network for a few days, and wanted to share some information on it.
Scuttlebutt isn´t so much a program as an ecosystem, a collection of programs, protocols, servers and people that allow users to share information peer-to-peer.
The …
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Bitcoin uses the same cryptographic concepts we have been discussing in class to achieve a startling result. A decentralized system for financial transactions. Here we will see some of the concepts illustrated with python code.
I learned a lot from the bitcoin paper[1], and a couple of blog entries …
C. TItus Brown showed us this really cool service called binder in the mRNAseq data analysis workshop on Saturday.
If you go to
and paste in a github repository like
https://github.com/humberto-ortiz/ama
that contains some data and some jupyter notebooks, binder will redirect you …
more ...Theorem 1. In a uniform juggle with dwell time \(D\), vacant time \(V\), flight time \(F\) then
$$\frac{F+D}{V+D}=\frac{B}{H},$$where \(B\) is the number of balls and \(H\) the number of hands.
Scientific Aspects of Juggling.
In Claude Elwood Shannon: Collected Papers. Edited by …
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