mreiner · HackerTrans

geçen yıldiscuss

I had to scan some historic books and papers for a research project and tried a couple desktop apps and python libraries. Still the Android scan to document worked better, so I just photographed all pages which was faster, then wrote an unsupervised python script to loop through the images in the camera folder and send them to Google Document AI for OCR, added some metadata and merged them. This outperformed the other even commercial solutions I tried by far and was dirt cheap. If you're interested I'll clean up the code and put it on github.

mreiner

2 yıl öncediscuss

Cool project! Around that topic I can also recommend a channel of this engineer (switch to auto-translate): https://www.youtube.com/watch?v=Cv0s6TgwbJg

Paraphrased:

- push-pull ventilation is easy to install and comparatively cheap

- it's prone to hygiene issues like blowing dirt out of the filters back into the air and providing a moist environment for microorganisms in some operational conditions

- it's prone to windy conditions

- the numbers stated by commercial vendors seem to have no basis in reality, there seems to be no vendor providing data based on the relevant testing standard for these systems. OPenERV states they want to get it tested by Passivehause institute but also say no lab data measured yet.

Might be just my counter-factual gut-feeling, maybe a mechanical window opener based on EspHome for short pulsed passive ventilation intervals is actually more efficient, easier to implement and need less maintenance? Not aware of any comparisons though and last time I checked I could only find some finicky 3d printed actors that might not survive a guest opening the window.

mreiner

4 yıl öncediscuss

Interesting reports of individuals turning their life upside down. Just don't understand how they account for confounders and seem to make carbs responsible for everything that went wrong before their transition. But since sometimes it's those individual reports that get people to take action, I don't judge, happy for everyone taking charge of their health.

There are many factors driving weigth loss or gain, the macronutrients per se seem to be irrelevant in the long term though: https://pubmed.ncbi.nlm.nih.gov/19246357/

There are health risks involved in low/no carb diets and the article mentions none of those.

mreiner

4 yıl öncediscuss

I like your concept, can imagine it to look quite aesthetic.

Consider you need to create a fair pressure gradient between the two sides of the filter and it needs to be higher the more the filter clogs up. AFAIK radial fans are more efficient for that purpose. Downside is the noise.

If you are running the ceiling fan anyway just for the turbulence it creates on a hot day, it's probably fine even if just a small percentage of the airflow is pulled through the filters, your data certainly looks promising.

mreiner

4 yıl öncediscuss

From what I understood about how the system works in most European countries:

A test has a specific sensitivity and a rate of false positives. So for screening (CT in this case) you would want a high sensitivity and low cost, while the false positives would not be your priority. The positives should go through a confirming test (biopsy in this case) with a high specificity. Here cost and sensitivity are usually secondary.

Now insurers look at the screening tests rate of false positives. If they deem it too high, they don't want doctors to do those tests on a population with a low probability of having the condition you are screening for (low base rate). If the patient belongs to a subgroup shown to have a high enough base rate of a condition, then it makes sense to do the screening.

Then you have different patients, some want to get one MRI each year, some only want to run diagnostic after they experience symptoms. I believe most doctors respect that individual risk tolerance within the given framework.

Now the thresholds obviously should be revised regularly as cost, test properties and even base rates of diseases change, but I don't see a systemic defect here, my blind spot?

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