metaphor

> I know what that is, having done quite a bit of complex maths, but the kind that uses i, not the kind that uses j

Some things in life leave a lasting impression[1]. :eye_roll:

It sounds like what you're looking for is an explanation of root locus analysis[2].

In the simplest control case, a transfer function is nothing more than the expression of a continuous closed-loop LTI system's output Y(s) over its input X(s) in the Laplace domain, conveniently abstracted as its forward path G(s) and negative feedback path H(s).

From there, Routh-Hurwitz method[3] can be used to determine stability of the system.

...and I will continue to use j, thanks.

[1] https://youtu.be/1rqJl7Rs6ps?t=1828

[2] https://en.wikipedia.org/wiki/Root_locus

[3] https://en.wikipedia.org/wiki/Routh%E2%80%93Hurwitz_stabilit...

> Interesting username for such an opinion.

Perhaps just a coincidental namespace collision: Process ID, not Proportional-Integral-Derivative.

> Stuff like Nyquist criterion just sort of appears out of nowhere as functions.

Black's canonical 1934 paper[1] Stabilized Feedback Amplifiers, which had an outsized influence on EE classical control theory, may have something to do with that:

Results of experiments, however, seemed to indicate something more was involved and these matters were described to Mr. H. Nyquist, who developed a more general criterion for freedom from instability applicable to an amplifier having linear positive constants.

...which directly cites Nyquist's canonical 1932 paper[2] Regeneration Theory.

[1] http://archive.org/details/bstj13-1-1

[2] http://archive.org/details/bstj11-1-126

Are you alluding to e.g. IEEE 1149.6[1] and IEEE 1687[2], or something different?

[1] https://standards.ieee.org/ieee/1149.6/4706/

[2] https://standards.ieee.org/ieee/1687/3931/

It appears you're conflating the parametric/functional spec of a product with the statistical spec of a process in manufacturing said product at volume.

> Also would you want to work on something that'll never work?

When the proposed alternative is a remote workflow with Jira and Confluence shoved down your throat as a matter of corporate dogfooding policy, I do wonder how much of this is the pot calling the kettle black.

> Most Japanese people have a green tube of grated wasabi in their house. (https://www.sbfoods.co.jp/products/detail/16343.html)

>> 原材料名: 本わさび、西洋わさび、...

...except the everyday stuff shown in your link indeed contains substantial 本わさび as a first ingredient, whereas the typical stuff sold in the US[1] is effectively just 西洋わさび and happens to be explicitly labeled "For external Japan" (despite also being manufactured in Japan) for reasons.

In other words, a consumer in Japan who settles on "close enough" isn't really making an equivalent compromise as a consumer in the US.

[1] https://www.sbfoods-worldwide.com/products/search/001.html

Thanks for the clarification.

Not a user, but doesn't MercadoLibre operate as a licensed financial institution in at least a portion of their vertical where such a requirement would not be considered unreasonable?

I can certainly see them playing dark pattern games with sensitive privileged data from one business cross-pollinating into unrelated businesses by way of blind user agreement acceptance though.

EDIT: From their most recent 10-K filing[1], under Government regulation:

In addition, Mercado Pago as a payment institution in Brazil is subject to:

...

(iv) Data Protection Law: In August 2018, Brazil approved its first comprehensive data protection law (the “Lei Geral de Proteção de Dados Pessoais” or “LGPD”), which became applicable to our business in Brazil since August 2020. In December 2018, the former president of Brazil issued Provisional Measure No. 869/2018 which amended the LGPD and created Brazil’s national data protection authority (the “ANPDP”). We have created a program to oversee the implementation of relevant changes to our business processes, compliance infrastructures and IT systems to reflect the new requirements and comply with the LGPD. The LGPD establishes detailed rules for the collection, use, processing and storage of personal data and affects all economic sectors, including the relationship between customers and suppliers of goods and services, employees and employers and other relationships in which personal data is collected, whether in a digital or physical environment.

(v) Secrecy rules: In addition to regulations affecting payment schemes, Mercado Pago is also subject to laws relating to internet activities and e-commerce, as well as banking secrecy laws, consumer protection laws, tax laws (and related obligations such as the rules governing the sharing of customer information with tax and financial authorities) and other regulations applicable to Brazilian companies generally. Internet activities in Brazil are regulated by Law No. 12,965/2014, known as the Brazilian Civil Rights Framework for the internet, which embodies a substantial set of rights of internet users and obligations relating to internet service providers, including data protection.

Law No. 12,865/2013 prohibits payment institutions from performing activities that are restricted to financial institutions, such as granting loans directly. In November 2020, the BACEN approved the application filed by MercadoLibre Inc. for authorization to incorporate a financial institution in the modality of credit, financing and investment corporation (SCFI). In light of the authorization granted by BACEN, we incorporated a new entity (Mercado Crédito Sociedade de Crédito, Financiamento e Investimento S.A.), which operates activities related to the granting of loans and obtains better funding alternatives for our business.

...

The BACEN is also implementing the Brazilian Open Banking environment, to enable the sharing of data, products and services between regulated entities — financial institutions, payment institutions and other entities licensed by the BACEN — at the customers' discretion, as far as their own data is concerned (individuals or legal entities). The Open Banking implementation has been gradual, through incremental phases that take into account specific information/services to be shared, and Mercado Pago is a participant of the Open Banking system since February 2021, when its phase 1 started.

[1] https://www.sec.gov/Archives/edgar/data/0001099590/000156276...

Does the recent 5th Circuit decision[1] related to civil penalties issued by administrative agencies have any relevance here?

The article mentioned that the complaint was "filed by the Department of Justice on behalf of the FTC," which sounds a bit more involved than the FTC saying, "Hey Twitter, here's your sign, now pony up"...I have no idea how the game is actually played though.

[1] https://news.ycombinator.com/item?id=31429091

> Compatibility: Logi Bolt USB Receiver[^11]

> [^11] Not compatible with Logitech Unifying USB Receiver technology

So you'll have to throw away your existing MX Anywhere 3 and repurchase this seemingly vaporware "for Business" variant[1] if you want a single transceiver for mouse+keyboard? Hmm...

[1] https://www.logitech.com/en-us/products/mice/mx-anywhere-3-f...

> ACM has opened more than 117,500 articles published between 1951 and the end of 2000, during the first 50 years of its publishing program.

Up to end of 2000, so it appears there's still residual value in holding Lifetime Membership[1]. This is nevertheless a huge leap in the right direction.

Here's to hoping ACM applies some funds toward maintaining the DL mobile app, which hasn't seen an update in like 5 years.

[1] https://www.acm.org/membership/lifetime-membership

The winning team's research was previously discussed[1] a few weeks ago.

[1] https://news.ycombinator.com/item?id=31200793

Worth noting that a correction was buried at the end of the article:

> Correction May 17th, 6:40PM ET: The Tudum workers who lost their jobs were contractors, not Netflix employees, as this story originally stated.

The Department of Education's College Scorecard for BU[1] suggests relatively few given the reported $30,395 average annual cost figure, which is described as:

> The average annual net price that a student who receives federal financial aid pays to cover expenses (e.g., tuition, living expenses) to attend a school. Net price is the school's cost of attendance minus any grants and scholarships received. For public schools, this is only the average cost for in-state students.

In comparison, Stanford's reported average annual cost[2] is $12,894. This makes sense given its student responsibility[3].

[1] https://collegescorecard.ed.gov/school/?164988-Boston-Univer...

[2] https://collegescorecard.ed.gov/school/?243744-Stanford-Univ...

[3] https://financialaid.stanford.edu/undergrad/how/student.html

This.

Was in the same boat over a year ago when AT&T started SMS spamming about 3G sundown plans on one of my prepaid phones (Blackberry Key2) flagged as "incompatible"; to be sure, the older KEYone and Priv models are apparently whitelisted because AT&T had sold and directly supported those models at some time in the past.

Got so annoyed by the recurring, persistent warnings and no reasonable explanation why this 4G VoLTE phone would be sucking hind tit on their network in the near future that I ported the number to T-Mobile on a random Sunday afternoon (reduced monthly bill too) and never looked back.

If the UX leading up to disconnect was anything like mine, I'm honestly not sure why this event is catching so many AT&T customers off guard.

> A colonel in Kansas may live like a king, but a captain in San Diego can't afford a house.

Assuming both sought living accomodations outside of free base housing, I was curious what those figures actually looked like[1]:

- O-6 colonel stationed at, e.g. Fort Riley, KS 66442, would draw up to an additional $1500 without dependents, $1911 with.

- O-6 captain stationed at, e.g. NAS North Island, CA 92135, would draw up to an additional $3342 without dependents, $4026 with.

It's worth mentioning for those unfamiliar that, just like BAS (i.e. food allowance), this BAH (i.e. housing allowance) is completely tax-exempt.

The game that active service members play here is to secure a home mortgage (often through VA home loan), then apply BAH directly towards monthly mortgage payments throughout service all the way to retirement. It's not hard to imagine other tax advantaged games to be played here. Applying BAH to rent a house off base is a naive fool's errand.

In terms of annual cost of living adjustments to base pay, uniformed service received +2.7% increase this year; in contrast, +2.2% for federal GS civilians. The year before that, it was +3% v. +1%. These adjustments have historically favored uniformed service over the federal civilians that work beside them. Sure, they're lowball relative to inflation, but that ought to be squared against military tax-exempt BAS/BAH and hugely subsidized commissary entitlements.

Exceptionally common amongst Navy personnel, married sailors typically draw an additional $250/mo family separation allowance[2] when out at sea for more than 30 continuous days. This will obviously have a greater financial impact amongst the enlisted ranks than officers. Depending on rank and job, there's a litany of allowances, bonuses and incentives (beyond the scope of this remark) that are often ignored when the conversation of military service compensation is brought up...nevermind that no one ever talks about the opportunity to retire with guaranteed pension + benefits for life as young as 38.

As an outsider, I'm inclined to agree that military health professions do seem to pay a substantial indirect opportunity cost despite the unique bonuses they're entitled to[3].

I do wonder what individual circumstances led you to choose a Navy commission over everything else?

[1] https://www.defensetravel.dod.mil/site/bahCalc.cfm

[2] https://www.dfas.mil/militarymembers/payentitlements/fsa/

[3] https://www.dfas.mil/militarymembers/payentitlements/Pay-Tab...

Bureau of Labor Statistics reports[1] the national median pay was $47,130 in 2020 for the profession.

[1] https://www.bls.gov/ooh/transportation-and-material-moving/h...

Precisely how do you define definitive so that we might better understand what you assert to be wrong?

My naive intuition suspects he knows, so here's a contrarian curveball pulled directly out of JEDEC JESD88 Dictionary of Terms for Solid-State Technology[1] to consider (my emphasis):

> drain power voltage (VDD): The primary power voltage on MOS devices that require a potential that differs from the normal system logic voltage. The term VDD is used interchangeably with VCC on devices that use 5‑V supplies.

[1] https://www.jedec.org/standards-documents/dictionary/terms/d...

> Non-alcoholic beverage containing 10 percent or more of not-from-concentrate coconut water, with added flavors and stevia, packaged for retail sale

More specifically, Bai Brands[1], owned by Keurig Dr Pepper.

[1] https://www.drinkbai.com/bai-cocofusion

> Divided between two people, that's $637 per month. If we go with the rule that 1/3 of your wages should go to housing, that means you'd need to make $1911 per month to afford that apartment. If you worked 40 hours a week, and there are (on average) 4.3 weeks per month, that means you'd need to make $11.11 per hour to afford that apartment.

Apologies for the approximation nit and acknowledged that it was all back of the envelope, but $11.11/hr struck me as low at face value.

Upping the ante a bit, let's further assume single standard deduction earner with a $1911 net monthly income requirement (because you can't actually pay with money you don't have), which roughly implies 12% marginal tax bracket. Let's also account for fixed 6.2% social security withholding, and fixed 1.45% medicare withholding.

Squaring against this standard 2022 IRS Publication 15-T withholding method[1], we come to the following arithmetic expression to determine gross monthly income requirement:

(grossMonthly - fixed10pc - marginal12pc - ssWithholding - mcWithholding = netMonthly)

  x - 85.60 - 0.12(x - 1935) - 0.062x - 0.0145x = 1911

Crunching the numbers (~$2196 gross monthly income) while using your proposed 4.3 weeks per month scalar, it's more like $12.77/hr (or $11.11 being -13.0% in relative error).

To be sure, this assumes complete omission of common tax-advantaged benefits such as deferred 401(k) retirement savings and medical/dental insurance coverage.

> The minimum wage in Florida is currently $8.65 per hour.

Florida's prevailing minimum wage is in fact $10/hr[2], with scheduled increases at $1 every year towards a $15/hr target by 2026[3].

[1] https://www.irs.gov/pub/irs-pdf/p15t.pdf ref PDF p. 59

[2] https://www.dol.gov/agencies/whd/minimum-wage/state#fl

[3] https://floridajobs.org/docs/default-source/business-growth-...

EDIT: Whoops, accidentally used table values for two-or-more jobs scaling; corrected.

> Hell, adjusting the 70's minimum wage to today's dollars puts it at like $24...

Bullshit...the unqualified assertion doesn't even pass a ballpark sniff test using Department of Labor's historical federal minimum wage rates[1] and Bureau of Labor Statistics' CPI inflation calculator[2] against Feb 2022 buying power.

  | Eff Date | Rate | Today |
  |----------|------|-------|
  | Jan 1970 | 1.60 | 12.01 |
  | May 1974 | 2.00 | 11.68 |
  | Jan 1975 | 2.10 | 11.44 |
  | Jan 1976 | 2.30 | 11.74 |
  | Jan 1978 | 2.65 | 12.03 |
  | Jan 1979 | 2.90 | 12.05 |

[1] https://www.dol.gov/agencies/whd/minimum-wage/history/chart

[2] https://data.bls.gov/cgi-bin/cpicalc.pl

> You can mitigate tin whiskers with a conformal coat application.

Precisely how effective do you think that'll be when your core packages are fine grid BGA?

> Another possibility is that these are modified CM4 boards where parts were removed and resoldered using lead solder.

This is the only long-term and standard solution I see, including package reballing. However, the fundamental problem with this approach is that the underlying PCB substrate is consumer grade that isn't designed for rework.

38999-like, which the marketing language generously omits.

Make no mistake, Glenair proprietary interconnect is used here. See this[1] for some sense of why this subtle distinction matters.

[1] https://www.grassley.senate.gov/news/news-releases/grassley-...

> supports nvme drives

Before that, I'd honestly like to see TPM 2.0 support baked in first.

> has no Bluetooth or Wifi by default

Alas, not the case here[1]. Genuinely looks like they just stuffed a consumer RPi CM4 on a custom carrier board wrapped in metal, pushed through the easier boilerplate environmental checks like all their other SBCs, then put out a press release.

Not sure how I feel about the interconnect choice; power via Omnetics proprietary (28 VDC input, but nothing assertive in datasheet on satisfying 704 requirements) and everything else via Glenair proprietary (with roughly half a quarter physical clearance between them) in what appears to be the equivalent of 38999 service class F finish (which won't survive 500-hr dynamic salt spray). I also do wonder if mechanical engineers would raise a nit at the countersunk retaining of enclosure top.

The hardest thing to swallow here is having to pay an undisclosed MIL premium for what will fundamentally be constrained by its consumer RPi CM4 core. Even if Curtiss-Wright lifetime buys for a gratuitous 10-yr support posture, it's hard to imagine how liabilities like tin whiskers can be pragmatically avoided, or what that means in terms of MTBF post-fielding.

This will probably fill someone's niche, but I agree that what's really missing is a robust RPi4 clone.

[1] https://www.curtisswrightds.com/products/computing/systems/s...

Do you seriously think these guys are like, "pick a crime and target, anything really so long as it's a legit felony...we'll give you a week to get creative, then when you're ready, we can all sing kumbaya while you demonstrate your loyalty to the group"?

Color me unconvinced.

Wow, figured uniquely colored switches would drive up cost[1], but certainly didn't expect over US$10/ea at 10 units MOQ...hard pass.

[1] https://www.newark.com/erg-components/sds-8-014/dip-switch-8...

I thought the generalized examples here[1] were objectively adequate.

Using real world examples in this context strikes me as dancing into a mine field and a dismissal of the nuanced exercise towards understanding that the author suggests[2].

[1] https://consilienceproject.org/content/images/size/w1000/202...

[2] https://consilienceproject.org/content/images/size/w1000/202...

Are other cities that operate major Class I freight rail seeing the same looting issue, or is this just LA/UP "market disruption" that hasn't caught up with the rest of the country?

EDIT: To be sure, I wonder because my city is both HQ and a significant hub for one of those F500 major Class I freight rail operators, but I haven't heard of such brazen exploits happening locally...yet?