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drhodes

718 karma · joined May 3, 2009

https://proofbased.org/assets/resume.pdf
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drhodes··on A clip from Stray got me banned from Twitter
Calling the support staff "dense" was probably not the right move..
drhodes··on Runway melts at London Luton airport as temperatures in UK near 40°C
I didn't know there was a difference between the two!

> Asphalt is a mixture of aggregates and bitumen that needs up to two days before it completely cures. Whereas, Tarmac is a combination of crushed stone and tar that cures quickly.

https://tarmacdriveways.ie/key-differences-tarmac-vs-asphalt...

drhodes··on Variations of Two-Transistor Circuits: A Tribute to the Versatility of MOSFETs
There is JADE (for education), which can be integrated into a blog or for teaching on the web. It supports hierarchical custom analog and digital modules, a convenient way to create test vectors, (docs for that are floating around) This tool was used by students to build and grade the BETA CPU.

https://computationstructures.org/exercises/sandboxes/jade.h...

drhodes··on Computers are an oppressive technology
> because we don’t know how to program them to consider how their actions will affect other people.

We don't have to. For example, a ruthless train door could be made less ruthless, by having sensors that respond to someone who is nanoseconds late, to open the door, just that once, just like it's elevator door brethren, but only once.

The problem is that "inherently opportunistic people" will take advantage of the machine kindness and take an entire train full of people hostage.

The oppressive train door is a dictator everyone loves, maybe if they were also razor sharp, people would give them the respect they deserve. phwump. guillotrains. on time, every time.

drhodes··on Listening to songs can cause a physiological response known as “frisson”
Yes, also, if I'm really tired then I don't experience frisson.
drhodes··on MITx Multivariable Calculus starts next week
Syllabus

  Unit 1: Functions of two variables

  Graphing functions and slicing
  Level curves
  Partial derivatives
  Tangent planes
  Linear approximation

  Unit 2: Geometry of derivatives

  Vectors
  Dot products
  Gradients
  Vector fields
  Directional derivatives

  Unit 3: Optimization

  Critical points
  Second derivative test
  Constrained optimization
  Lagrange multipliers
  Least squares approximation

  Unit 4: Matrices

  Systems of equations
  Matrix algebra
  Undetermined and overdetermined systems
  Linear functions as matrix maps

  Unit 5: Curves

  Parametric curves in 2 and 3 dimensions
  Chain rule
  Vectors and derivatives in three dimensions and higher
drhodes··on Matrix Multiplication
Denis Auroux explains that way of seeing it, https://youtu.be/bHdzkFrgRcA?t=1404
drhodes··on Learn Vector Calculus, Thoroughly
I'm reposting this because it's important that people who want to sign up, do so soon. It sucks to get a late start or try to hack it going into the second part of these courses.
drhodes··on MITx Multivariable Calculus, 18.02x is open for registration
Why is vector calculus important to programmers? It may not be to some, but for others it definitely is. For games? Some fluency with vectors in three dimensions goes a long ways. ∇ Multivariable calculus opens doors to upper level engineering, statistics, physics, finance, machine learning theory, it's all over the place.

https://en.wikipedia.org/wiki/Gradient_descent

For people who didn't have a great experience with their own university studies and for current students who may have had a less than stellar introduction over a covid semester, this is a great opportunity to really learn it. If you have single variable differential and integral calculus under your belt, my suggestion is to sign up for this class and give it 100%. The course is free to audit, but if you can afford it then give them your money! They'll be incentivized to make more of these excellent courses and besides, they deserve it.

This is an important time for online learning. The hype over MOOCs has died down and the dedicated remaining educators are still at it, learning from our participation. It's not perfect yet, but even today some of the courses are way better than their brick and mortar counterparts. I think this will be true for 18.02x.

drhodes··on Ultiboberon – Oberon on bare metal Raspberry Pi
Yep, check it out

https://en.wikipedia.org/wiki/Unikernel

https://mirage.io/

A 2014 podcast from IEEE,

https://www.se-radio.net/2014/05/episode-204-anil-madhavaped...

drhodes··on Ask HN: Non-US Fired after bipolar depression shared with HR. Can they fire me?
Try these folks: The National Alliance on Mental Illness

https://www.nami.org/Home

drhodes··on YouTube is shutting down crowdsourced captions
This task would be good for captcha fodder.
drhodes··on Factorio 1.0
Sounds like Danny Elfman wrote the music to the 2 minute video :) has strong resemblance to the simpsons / beetlejuice / men in black, couldn't imagine a better fit.
drhodes··on Body Camera Once Again Catches an NYPD Officer Planting Drugs in Someone's Car
or the privacy button could encrypt the video stream instead of shutting it off.
drhodes··on MIT 6.004: Computation Structures
The previous version, with full labs, autograded tutorial problems and exercises is still available here:

https://computationstructures.org/lectures/info/info.html

Also, an archived version of that course is still running on edx ...

https://www.edx.org/course/computation-structures-part-1-dig...

.. where there is a forum available, so people can still ask questions about how to build a 32-bit CPU from scratch using MOSFETs :)

It's also on OCW,

https://ocw.mit.edu/courses/electrical-engineering-and-compu...

drhodes··on Ask HN: How Can I Learn Music Theory?
Berklee has a course on edx

https://www.edx.org/course/introduction-to-music-theory-2

drhodes··on Office noise bothers some people more than others
it's included with sox

http://sox.sourceforge.net/Main/HomePage

drhodes··on Office noise bothers some people more than others
When noise gets bad for me, I put in foam ear plugs, wear large headphones and use the following command to summon a pleasant oasis somewhere under a tropical waterfall far from the misophonic hell.

alias noise='play -n synth brownnoise synth pinknoise mix synth sine amod 0.02 80'

drhodes··on What does the Laplace Transform tell us? A visual explanation [video]
I noticed outdoor LED lamps flickering too, but only at dusk, and for what I thought was a feedback issue. These lamps are solar powered and turn on at night.

The cool part is that at twilight, when the light turned on, the little bit of reflected light bounced back to the photovoltaics, adding just enough light to turn the light off, which brought the system full circle. Amazingly, this behavior only occured for about 1 minute each day.

drhodes··on France Set to Roll Out Nationwide Facial Recognition ID Program
https://dune.fandom.com/wiki/Butlerian_Jihad

"The god of machine-logic was overthrown by the masses and a new concept was raised..."

drhodes··on Show HN: Ascii_tree – A way to create beautiful ASCII trees
Here's a good collection

https://en.wikipedia.org/wiki/Box-drawing_character

drhodes··on Kickstarter’s Year of Turmoil
I don't know much about unions either, but found this recent NPR interview to be informative. Like many interviews, the guest is selling a book.

https://www.wbur.org/onpoint/2019/08/14/labor-unions-beaten-...

Steven Greenhouse, author of "Beaten Down, Worked Up: The Past, Present, and Future of American Labor." Reporter at The New York Times for 31 years, who covered labor and the workplace for 19 years. (@greenhousenyt)

drhodes··on The Heir to a Tofu Dynasty Finally Learns to Make Tofu
https://web.archive.org/web/20181012112119/http://www.plantf...

This is the best recipe I've found, but I haven't made it yet, still trying to track down a good deal on soybeans.

drhodes··on Programming as Theory Building (1985) [pdf]
For people with screen readers, here is an html version from the wayback machine.

https://web.archive.org/web/20121223063306/https://www.dc.ub...

drhodes··on Where did the melody go? (2017)
It kind of sounds like you're having a hard time finding good new music. It's out there if you look.

Snarky Puppy - Lingus (We Like It Here) https://www.youtube.com/watch?v=L_XJ_s5IsQc

Hiatus Kaiyote - By Fire https://www.youtube.com/watch?v=-Ilr1AY41AA

Alina Engibaryan - We Are https://www.youtube.com/watch?v=i-dusz1TyD0

drhodes··on Reddit and the Struggle to Detoxify the Internet (2018)
people who have worked for russian troll farms have given interviews:

https://www.wnycstudios.org/story/curious-case-russian-flash...

drhodes··on Ask HN: How do you organise your hard drive?
For people who haven't seen it, ncdu is great for purging cruft, it's an ncurses app that sorts by size (descending) and helps identify where to focus cleaning efforts.
drhodes··on China hacked HPE, IBM and then attacked clients
https://www.amnestyusa.org/execution-vans-organ-harvesting-b...

> For many years, it has been known that China uses execution vans, kind of like specially outfitted ambulances, to more efficiently carry out its exceedingly large number of executions. The method of killing in these vans is lethal injection, which has been slowly but surely replacing the firing squad as China’s preferred means of execution, and both lethal injection and the vans are believed to facilitate the widespread practice of harvesting organs of the executed prisoners, an unbelievably appalling practice.

drhodes··on Vigilante engineer stops Waymo from patenting key lidar technology
> The limiting factor is money.

When isn't it? Parent was suggesting the US is underfunding the USPTO. The undisputed claim is that they got all the money they requested. If they need more money, then they should request more. My line of reasoning can be falsified by showing the USPTO didn't get all the money they requested, or that through some bureaucratic machinations submitted an insufficient budget under duress.

This quora post corroborates your napkin math

https://www.quora.com/How-much-time-does-a-patent-examiner-s...

They seem to get 14-29 hours. Your implied claim is: that isn't enough time, for which you'll have to make a case because it isn't established. How much time is enough? What degree of "patent integrity" is acceptable, are there diminishing returns in spending twice as much time assessing a patent? What other federal programs should be sacrificed to make the patent system X% more accurate?

drhodes··on Vigilante engineer stops Waymo from patenting key lidar technology
> A quick review of the budget and supporting Commerce Department Appendix suggests the United States Patent and Trademark Office (USPTO) has received everything it requested ($3,586,193,000), and will not suffer the indignity of fee diversion...

https://www.ipwatchdog.com/2017/05/23/uspto-3-6-billion-pres...

more about the fee diversion

https://en.wikipedia.org/wiki/United_States_Patent_and_Trade...

The USPTO isn't mentioned in the congressional budget resolutions

https://en.wikipedia.org/wiki/2018_United_States_federal_bud...

> Congress Approves $1.3 Trillion Spending Bill, Averting a Shutdown

https://www.nytimes.com/2018/03/22/us/politics/house-passes-...

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