Tuomo Valkonen

@tuomov
3 Followers
10 Following
18 Posts

I write about rot. Maybe, perhaps, occasionally, something educative as well. But, mainly, the rot all around us.

And how to try to fix it.

Websitehttps://tuomov.iki.fi/
Show threadTuomo Valkonen19h ago
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Our main theoretical contribution is the stability analysis of the convection--diffusion equation with respect to its parameters: the measure, and the convection and diffusion fields. Numerically, we employ a semi-grid-free #optimization approach for reconstructing the source measure. Our experiments demonstrate accurate localisation, highlighting the potential of the method for practical gas emission detection.
Show threadTuomo Valkonen19h ago
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Abstract: We study the #InverseProblem of locating gas leaks from line-of-sight concentration measurements using a convection–diffusion model with the source term a Radon measure. By imposing sparsity-promoting regularisation on this measure, we recover point sources—identifying both their locations and intensities—rather than diffuse approximations. We jointly estimate the underlying physical convection (wind) and diffusion parameters.
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Tuomo Valkonen19h ago

New research: Dang & Valkonen - Leak localisation with a measure source convection–diffusion model

https://arxiv.org/abs/2605.12095

#inverseproblems
#optimisation

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Leak localisation with a measure source convection-diffusion model

We study the inverse problem of locating gas leaks from line-of-sight concentration measurements using a convection-diffusion model with the source term a Radon measure. By imposing sparsity-promoting regularisation on this measure, we recover point sources - identifying both their locations and intensities - rather than diffuse approximations. We jointly estimate the underlying physical convection (wind) and diffusion parameters. Our main theoretical contribution is the stability analysis of the convection-diffusion equation with respect to its parameters: the measure, and the convection and diffusion fields. Numerically, we employ a semi-grid-free optimisation approach for reconstructing the source measure. Our experiments demonstrate accurate localisation, highlighting the potential of the method for practical gas emission detection.

arXiv.org
Show threadTuomo Valkonen2d ago

What is the alternative then, you ask? The story itself shows the alternative: posterior #OrganicPeerView based on real use, not bureaucracy.

https://mastodon.social/@tuomov/116548197725315189

Tuomo Valkonen2d ago
More junk research *not* caught by entirely dysfunctional peer review. Bureaucratic #PeerReview is a scam. https://arstechnica.com/ai/2026/05/influential-study-touting-chatgpt-in-education-retracted-over-red-flags/
Influential study touting ChatGPT in education retracted over red flags

The retracted study on ChatGPT in education was already cited hundreds of times.

Ars Technica
Tuomo Valkonen2d ago

RE: https://mastodon.social/@tuomov/116548180733833581

I am exploring writing as one possible escape from #EPNEcuador (Escuela Politécnica Nacional)—a former university with now-buried ambitions of becoming an “university of excellence,” rapidly devolving into a village school.

My first story returns to something that I left a long time ago – #Linux and #OpenSource – but recently tried to return to, only to find that it had not improved at all, being just as rotten as the #academia.

That, too, will be touched upon in future posts.

Show threadTuomo Valkonen3d ago

@ezeno And, most importantly, this is not an argument against using #Linux. It’s a plea for simplifying the mess that #gnomification created, telling the gatekeepers to jump in the lake and drown themselves, and, finally, enabling open source software to take over the world.

Linux and #OpenSource people who do not see that this is necessary, and fight it, are harming the movement. They are pushing everyone to Apple, Google, and Microsoft and their gated gardens and spyware.

Show threadTuomo Valkonen3d ago
@ezeno And the main argument is not about specific bugs, but whether it is fixable yourself. Linux today is not. It lost the beauty of unix (everything is a file), and replaced it with a mess of interfaces and buses, each using each other in a random graph pattern, undocumented. I’m sure commercial operating systems are just as ugly, but Linux is even further away from “just working”. You need to fiddle and to do so, anyone with other things to do in their life, requires SIMPLICITY.
Show threadTuomo Valkonen3d ago

@ezeno … I don’t even know what worked in the end. Nothing was clearly documented, the responsibilities of different components were completely unclear. What service it really is and how it is abbreviated was completely unclear. And the average-Joe-facing Gnome vomit does not expose any such configurability.

The lid closing I did not even try to fix. It’s a well-known roulette. One that many say should work on a Thinkpad, but not much else. It didn’t. Not on this Thinkpad.

Show threadTuomo Valkonen3d ago

@ezeno I did not mention a single explicitly identifiable bug. The problem, besides distributions, is the dungheap architecture, which makes fixing and debugging problems—like the two mentioned—yourself very difficult.

It is, for example, completely unclear where you configure Bluetooth to not advertise every possible imaginable service. There are so many moving parts, and I had to try at least 10 ChatGPT-invented options to try to disable the advertising. …