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pja

6,077 karma · joined April 24, 2011

Occasional computer wrangler
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pja··on LK-99: The live online race for a room-temperature superconductor
Who’s taking it seriously? It’s fantastic armchair entertainment.
pja··on Amazon requires services on Fire TV to give it 30% of ad impressions or revenue
Every streaming device manufacturer does this. Roku demands a revenue cut if you want your app on Roku devices, last time I paid for something Amazon Video on my Apple TV Apple forced the transaction to go through Apple Pay and presumably took their cut there.

It’s the standard business model in this market: sell a streaming device at or below cost and then turn to the streaming services & tell them that if they want access to the XX million people who own your device they’re going to have to pay up. 30% seems to be the going rate.

pja··on Scientists may have found mechanism behind cognitive decline in aging
Quality of sleep makes a huge difference to your mental faculties. If you could bottle it, the effect would be a multi, multi $billion drug.
pja··on US smartphone shipments fall sharply, but Android more than iPhone
LineageOS is great, but they can’t fix security holes in device firmware, which includes the graphics libraries which are available to every app.

With LineageOS you get OS updates (great!) but are still vulnerable to exploits that target binary-only firmware.

pja··on Cap'n Proto 1.0
It seems @zenhack maintained the Haskell bindings as well.
pja··on S.F. says incidents by Cruise, Waymo driverless taxis are ‘skyrocketing.’
The metaphor doesn't work all well for tailpipe emissions, but the reality that cars externalise their impact is obviously true for things like congestion, the cost of road maintenance & so on.
pja··on The dangers of tea drinking in nineteenth century Ireland
In terms of per capita consumption China and Japan are nowhere near the biggest tea drinking cultures in the world: There's a wide gulf between them & the top three which includes the UK & Ireland. But they in turn trail in the wake of the biggest tea drinkers of them all: the Turks.

If we're going to talk about cultures which have a close relationship with tea then the Turks beat out everyone else by a wide margin.

pja··on Ask HN: Why are most Startups asking for US Remote instead of just Remote?
In the UK you can operate as a ltd company all you like, but it won’t make a jot of difference if HMRC decides that IR35 applies to your role.

An “employer” can structure the contract to avoid IR35, but that’s precisely my point - now the “employer” needs local legal knowledge to maintain an arms length contractual relationship. (HMRC has also made the “employer” liable for IR35 problems: you can’t just punt the legal liability onto the “employee” and forget about it anymore.)

pja··on Ask HN: Why are most Startups asking for US Remote instead of just Remote?
Most European countries have laws that punch through a contractor relationship if it looks indistinguishable from an employee/employer one. So you need a legal judgement that your contract is written appropriately to avoid that

It's not hard necessarily, but you do need to get it right for each individual country. I can understand a company exec just not wanting the hassle.

You can employ through contracting agencies in the target country that handle all this stuff, but you'll still have a certain amount of pain when you run into different countries' Ideas of what is appropriate behaviour when firing someone.

pja··on Tell HN: Stripe killed my music locker service, so I'm open sourcing it
I’m still getting adverts for Brennan thingies online, did they find a way around the court judgement?
pja··on Update: U+237C ⍼ &Angzarr;
Just post on r/cambridge and/or r/cambridge_uni reddit & ask if a current or ex-student or faculty member would be willing to request it from the stacks & make a copy.

There’s bound to be someone who’ll drop in a request on their behalf.

pja··on AMD Expands AI Product Lineup with GPU-Only Instinct Mi300X with 192GB Memory
Stable Diffusion worked fine for me with Rocm & my RX580 (once I had compiled a custom torch library IIRC).

But I don’t know whether it works with the more recent RDNA2 cards.

pja··on Debian 12 “Bookworm”
Personally I use the official Mozilla releases of firefox & thunderbird & drop them in /opt so that they get updated as soon as an update is released.

Otherwise this is good advice.

pja··on Debian 12 “Bookworm”
The CD images should be downloadable towards the end of the day if previous releases are anything to go by.

This HN post jumped the gun a little with the Debian Wiki page: the final official release happens when https://debian.org/ gets updated to point to the new installation media.

pja··on Debian 12 “Bookworm”
I’d suggest testing over unstable as very occasionally broken packages get pushed to unstable. Testing has a week or two delay, which usually catches such problems.
pja··on Mark Zuckerberg on Apple’s Vision Pro headset
There’s a reason that all the drinks containers that Apple showed in their videos on the Vison headset had closed lids and straws.

You can’t easily drink out of an open topped container whilst wearing a headset, so without highlighting that (minor) issue, they wanted to plant the idea of having a sealed container with a straw on your desk as a solution before you ran into the problem yourself.

pja··on How many sensors for autonomous driving?
Depends on the angular resolution of the sensor as well.
pja··on How many sensors for autonomous driving?
> People argue that humans don't really use our stereoscopic depth past ~10m or so and that's a fair point.

The second paper I reference in this comment https://news.ycombinator.com/edit?id=36232198 claims that humans can maintain stereopsis out to 250m.

That’s a huge difference from 10m & if true suggests that human drivers might well use 3D vision when driving.

pja··on How many sensors for autonomous driving?
This paper suggests that human vision maintains stereopsis much further out than many researchers have thought: “Binocular depth discrimination and estimation beyond interaction space” https://jov.arvojournals.org/article.aspx?articleid=2122030

They measured out to 18m & point out that the typical measured limits of angular resolution of the human eye mean that we could extract stereo image information out to 200m or more.

This paper claims to demonstrate stereopsis out to 250m, which is roughly the limit you’d expect from typical human visual acuity: “Stereoscopic perception of real depths at large distances” https://jov.arvojournals.org/article.aspx?articleid=2191614

This paper suggests that steropsis occurs out to somewhere between 20m & 65m before other cues dominate 3D depth perception: “The Role of Binocular Cues in Human Pilot Landing Control” https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.30...

It seems that the claim that stereo vision only occurs in the near field case is probably wrong? Human stereo vision is much more capable than that & if it reaches out to significantly > 20m is surely being used when driving?

pja··on How many sensors for autonomous driving?
Only if that monitor was hooked up to a camera that could dynamically adjust its gain to achieve best possible image contrast in everything from bright sunlight to moonlit night.

You’d also lose depth perception entirely, which can’t be good for your driving.

pja··on Why do railway tracks have crushed stones alongside them?
You are making a classic straw man argument of the form: ”I shall take the thing and crank it up to the max & insist that only instantaneous change happen to show how ludicrous that would be”.

This is a wildly disingenuous argument! Incremental change is possible. Partial change is possible.

pja··on Family Photos vs 256 Kb RAM
IIRC you can put it in B+W mode & it’ll refresh as fast as an ordinary B+W eInk screen. Refreshing colour seems to take much longer for some reason.
pja··on A Sun-like star orbiting a boson star
> Is a "boson star" even a confirmed physical construct?

No. We don’t even have evidence of a candidate boson you could use to make one.

pja··on Here’s Why That Rivian R1T Repair Cost $42,000 After Just a Minor Fender-Bender
Yes: the same design decisions that make these vehicles very expensive to repair also makes them hard to fix at the manufacturing stage since any change inevitably affects every other part of the design.

Something to think about when designing systems!

pja··on Tesla’s “Full Self-Driving” sees pedestrian, chooses not to slow down
In the UK that would be an instant driving test failure.

The moment a pedestrian puts their feet on the crossing they have absolute right of way & it’s on you to stop. If a pedestrian is waiting to cross, you’re expected to stop.

If Tesla exports this self driving code to the UK it’s going to cause accidents because people will absolutely not be expecting this behaviour from vehicles on the road in the UK.

pja··on From Netflix to HBO, the terrible design of streaming is ruining TV
In the Netflix web interface there's a per profile setting to turn off that behaviour so you can watch the credits in peace.
pja··on Verified accounts are now prioritized
It's a service that one person paid $40+billion for after being forced to follow through on the contract for purchase that he tried to back out of & discovered that he was legally committed to it.

Nobody believes that Twitter is worth $40billion today, not even its current owner.

pja··on Changes to Tailscale Pricing and Plans
> For historical architectural reasons you cannot currently have more than one user on a “personal” tailnet (such as a gmail.com account). You need either your own domain or a GitHub Organization. Sorry. We will fix this, but not today. Meanwhile, don’t forget that you can use Node Sharing to share devices (including Exit Nodes) across individual tailnets.

Darn. Looks like I may have to create another tailscale account!

I do wonder whether this restriction will severely limit the number of 3-person free accounts that are created though - I have my own domain, but that probably puts me in a small minority of people, even the kind of nerds who are willing to try out tailscale in their own time? Which in turn might put something of a crimp on the hoped for flow of viral “my friend put me on their tailnet & I discovered how easy it was” signups.

I have been recommending tailscale to absolutely everyone though, so I guess free services work as a marketing tool!?

pja··on FBI is warning people against using public phone-charging stations
Yes. same chips. I suspect you’re right - it’s not the GPS itself that’s the problem but waking up the main CPU to run whichever App has requested location data.
pja··on FBI is warning people against using public phone-charging stations
There’s a fair amount of signal processing going on inside a GPS device.

Modern GPS chips only need around 25mW apparently - older chips can pull 100mW though. Scanning needs a bit more power than tracking.

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