136 Matching Annotations
  1. Last 7 days
    1. L’ingénierie est un processus structuré et méthodique qui permet de passer de besoins opérationnels à la mise en œuvre d’une solution.

      Ingénierie: - Méthode, structure, processus - Pas des besoins à une solution

      C'est cela que je n'ai pas saisi en discutant avec les universités françaises

    2. Cela correspondrait à ne pas faire le travail d’ingénierie, car il n’y aurait pas eu d’analyse.

      L'ingénierie nécessite une analyse avant de poser des solutions

  2. Nov 2022
    1. One example could be putting all files into an Amazon S3 bucket. It’s versatile, cheap and integrates with many technologies. If you are using Redshift for your data warehouse, it has great integration with that too.

      Essentially the raw data needs to be vaguely homogenised and put into a single place

    1. It took me a while to grok where dbt comes in the stack but now that I (think) I have it, it makes a lot of sense. I can also see why, with my background, I had trouble doing so. Just as Apache Kafka isn’t easily explained as simply another database, another message queue, etc, dbt isn’t just another Informatica, another Oracle Data Integrator. It’s not about ETL or ELT - it’s about T alone. With that understood, things slot into place. This isn’t just my take on it either - dbt themselves call it out on their blog:

      Also - just because their "pricing" page caught me off guard and their website isn't that clear (until you click through to the technical docs) - I thought it's worth calling out that DBT appears to be an open-core platform. They have a SaaS offering and also an open source python command-line tool - it seems that these articles are about the latter

    2. Working with the raw data has lots of benefits, since at the point of ingest you don’t know all of the possible uses for the data. If you rationalise that data down to just the set of fields and/or aggregate it up to fit just a specific use case then you lose the fidelity of the data that could be useful elsewhere. This is one of the premises and benefits of a data lake done well.

      absolutely right - there's also a data provenance angle here - it is useful to be able to point to a data point that is 5 or 6 transformations from the raw input and be able to say "yes I know exactly where this came from, here are all the steps that came before"

    1. Continuous remote monitoring of COPD patients—justificationand explanation of the requirements and a surveyof the available technologies

      Continuous remote monitoring of COPD patients—justification and explanation of the requirements and a survey of the available technologies



    1. it was clear that the European and US competitors werebenefiting from these changes to the curriculum in advances in commerce, inindustry, and even on the battlefield.

      Compulsory education and changes in curriculum in the United States and some of it's competitors in the late 19th century clearly benefitted advances in commerce, industry, and became a factor in national security.

  3. Sep 2022
    1. There has been much discussion about “atomic notes”, which represents the key ideas from a person’s research on some topic or source (sources one and two). These are not the kind of thing I am interested in creating/collecting, or at least not what I have been doing. A far more typical thing for me is something I did at work today. I was trying to figure out how to convert the output of a program into another format. I did some searching, installed a tool, found a script, played with the script in the tool, figured out how to use it, then wrote down a summary of my steps and added links to what I found in my search. Since I am not doing research for a book or for writing academic papers, the idea of an atomic note does not fit into my information world. However, capturing the steps of a discovery or how I worked out a problem. is very real and concrete to me. I used to know a fellow engineer who wrote “technical notes” to capture work he was doing (like a journal entry). Maybe that is how I should consider this type of knowledge creation. 

      Andy Sylvester says his engineering type of notes don't fit with the concept of atomic note. A 'how to solve x' type of note would fit my working def of 'atomic' as being a self-contained whole, focused on a single thing (here how to solve x). If the summary can be its title I'd say it's pretty atomic. Interestingly in [[Technik des wissenschaflichen Arbeitens by Johannes Erich Heyde]] 1970, Heyde on p18 explicitly mentions ZK being useful for engineers, not just to process new scientific insights from e.g. articles, but to index specific experiences, experiments and results. And on p19 suggests using 1 ZK system for all of your material of various types. Luhmann's might have been geared to writing articles, but it can be something else. Solving problems is also output. I have these types of notes in my 'ZK' if not in the conceptual section of it.

      Vgl [[Ambachtelijke engineering 20190715143342]] artisanal engineering, Lovelock Novacene 2019, plays a role here too. Keeping a know-how notes collection in an environment where also your intuition can play a creative role is useful. I've done this for coding things, as I saw experienced coders do it, just as Andy describes, and it helped me create most of my personal IndieWeb scripts, because they were integrated in the rest of my stuff about my work and notions. Vgl [[Vastklik notes als ratchet zonder terugval 20220302102702]]

  4. Aug 2022
    1. A good layperson's overview of one effort to increase cloud albedo to counteract climate change. I think that lowering insolation is somehow missing the point of combatting climate change, but it's a legitimate approach that still needs a lot of research.

      What's particularly good about this article is how it manages to demonstrate how complex the problem is without smothering the reader in technobabble.

  5. Jul 2022
    1. The major benefit of foreign keys is that they guarantee referential integrity. For example, say you have customers in one table that may refer to a number of invoices in another. Without foreign keys, you could delete a customer, but forget to remove its invoices, thereby leaving a bunch of orphaned invoices that reference an customer that’s gone.

      Note that GH doesn't use FK (at least back in 2016) https://github.com/github/gh-ost/issues/331#issuecomment-266027731 due to: * MySQL doesn't support it on partitioned tables * Performance impact. * FKs don't work well with online schema migrations

      From Postgres has foreign keys to be fully compatible with partitioned tables since 12. But still it's not that commonly used for larger DBs.

    2. If an operator ever queries the database directly they’re even more likely to forget deleted_at because normally the ORM does the work for them.

      This happens relatively often, especially for 1) engineers that run SQL queries directly against the DB for analysis or triaging production issues, and 2) data scientists that do not use the same programming language as the enginners

    1. At the same time, like Harold, I’ve realised that it is important to do things, to keep blogging and writing in this space. Not because of its sheer brilliance, but because most of it will be crap, and brilliance will only occur once in a while. You need to produce lots of stuff to increase the likelihood of hitting on something worthwile. Of course that very much feeds the imposter cycle, but it’s the only way. Getting back into a more intensive blogging habit 18 months ago, has helped me explore more and better. Because most of what I blog here isn’t very meaningful, but needs to be gotten out of the way, or helps build towards, scaffolding towards something with more meaning.

      Many people treat their blogging practice as an experimental thought space. They try out new ideas, explore a small space, attempt to come to understanding, connect new ideas to their existing ideas.

      Ton Zylstra coins/uses the phrase "metablogging" to think about his blogging practice as an evolving thought space.

      How can we better distill down these sorts of longer ideas and use them to create more collisions between ideas to create new an innovative ideas? What forms might this take?

      The personal zettelkasten is a more concentrated form of this and blogging is certainly within the space as are the somewhat more nascent digital gardens. What would some intermediary "idea crucible" between these forms look like in public that has a simple but compelling interface. How much storytelling and contextualization is needed or not needed to make such points?

      Is there a better space for progressive summarization here so that an idea can be more fully laid out and explored? Then once the actual structure is built, the scaffolding can be pulled down and only the idea remains.

      Reminiscences of scaffolding can be helpful for creating context.

      Consider the pyramids of Giza and the need to reverse engineer how they were built. Once the scaffolding has been taken down and history forgets the methods, it's not always obvious what the original context for objects were, how they were made, what they were used for. Progressive summarization may potentially fall prey to these effects as well.

      How might we create a "contextual medium" which is more permanently attached to ideas or objects to help prevent context collapse?

      How would this be applied in reverse to better understand sites like Stonehenge or the hundreds of other stone circles, wood circles, and standing stones we see throughout history.

  6. Jun 2022
  7. May 2022
    1. Robert Fenton, Electrical and Computer Engineering Professor Emeritus, pioneered the technology for the first wave of self-driving cars.

      I had Fenton for a class once and during a lecture he asked a question of the class. A student raised his hand and answered. Professor Fenton listened and asked the class "Does anyone else agree that his answer is correct?"

      About 85% of the students in the large lecture hall raised their hands.

      He paused, shook his head, and said "Well, then I'm afraid you're all going to fail." Then he turned around and went back to writing on the chalkboard.

  8. Apr 2022
    1. Much of this sort of information was later reverse-engineered, and cross-browser support for basic operations is actually quite good. (Browsers still vary widely on the details.)
    2. Reverse-engineering and standardizing contentEditable
    1. three steps required to solve the all-importantcorrespondence problem. Step one, according to Shenkar: specify one’s ownproblem and identify an analogous problem that has been solved successfully.Step two: rigorously analyze why the solution is successful. Jobs and hisengineers at Apple’s headquarters in Cupertino, California, immediately got towork deconstructing the marvels they’d seen at the Xerox facility. Soon theywere on to the third and most challenging step: identify how one’s owncircumstances differ, then figure out how to adapt the original solution to thenew setting.

      Oded Shenkar's three step process for effective problem solving using imitation: - Step 1. Specify your problem and identify an analogous problem that has been successfully solved. - Step 2. Analyze why the solution was successful. - Step 3. Identify how your problem and circumstances differ from the example problem and figure out how to best and most appropriately adapt the original solution to the new context.

      The last step may be the most difficult.

      The IndieWeb broadly uses the idea of imitation to work on and solve a variety of different web design problems. By focusing on imitation they dramatically decrease the work and effort involved in building a website. The work involved in creating new innovative solutions even in their space has been much harder, but there, they imitate others in breaking the problems down into the smallest constituent parts and getting things working there.

      Link this to the idea of "leading by example".

      Link to "reinventing the wheel" -- the difficulty of innovation can be more clearly seen in the process of people reinventing the wheel for themselves when they might have simply imitated a more refined idea. Searching the state space of potential solutions can be an arduous task.

      Link to "paving cow paths", which is a part of formalizing or crystalizing pre-tested solutions.

    1. innovation can result in trade-offs that undermine both progress on mitigation and 12 progress towards other sustainable development goals

      Broader impacts of engineering. Requires full scope considersation.

  9. Feb 2022
    1. https://www.scientificamerican.com/article/an-ancient-greek-astronomical-calculation-machine-reveals-new-secrets/

      Overview and history of the Antikythera mechanism and the current state of research surrounding it.

      Antikythera mechanism found in diving expedition in 1900 by Elias Stadiatis. It was later dated between 60 and 70 BCE, but evidence suggests it may have been made around 205 BCE.


      One of the primary purposes of the device was to predict the positions of the planets along the ecliptic, the plane of the solar system.

      The device was also used to track the positions of the sun and moon. This included the moon's phase, position and age (the number of days from a new moon). It also included the predictions of eclipses.

      Used to track the motions of the 5 known planets including 289 synodic cycles in 462 years for Venus and 427 synodic cycles in 442 years for Saturn.

      Risings and settings of stars indexed to a zodiac dial


      metonic cycle, a 19-year period over which 235 moon phases recur; named after Greek astronomer Meton, but discovered much earlier by the Babylonians. The Greeks refined it to a 76 year period.

      saros cycle, the 223 month lunar cycle which was used by the Babylonians to predict eclipses. A dial on the Antikythera mechanism was used to predict the dates of the solar and lunar eclipses using this cycle.

      synodic events: conjunctions with the sun and its stationary points


      Archimedes - potentially the designer of an early version of the Antikythera mechanism

      Elias Stadiatis - diver who discovered the Antikythera mechanism

      Albert Rehm - German philologist who the numbers 19, 76 and 223 inscribed on fragments of the device in the early 1900s

      Derek J. de Solla Price, published Gears from the Greeks in 1974. Identified the gear train and developed a complete model of the gearing.

      Michael Wright - 3D x-ray study in 1990 using linear tomography; identified tooth counts of the gears and understood the upper dial on the back of the device

      Tony Freeth - author of article and researcher whose made recent discoveries.

    2. It was not until the 14th century that scientists created the first sophisticated astronomical clocks.
    3. the first precision-geared mechanism known is a relatively simple—yet impressive for the time—geared sundial and calendar of Byzantine origin dating to about C.E. 600.

      The first known precision-geared mechanism is a sundial and calendar of Byzantine origin dating to circa 600 C.E.

  10. Jan 2022
    1. In comparison, the average household energy use for gas heating in Belgium – which has a moderate climate – is 20,000 kWh per year. Assuming that the average Belgian heating system is used for six months per year, daily energy use corresponds to 109.6 kWh per day. This energy could heat roughly 900 water bottles per day – enough to keep the whole neighbourhood comfortable.

      Nice calculations about energy consumption at a personal level (110kWh/day).

    1. Graham Allison and Niall Ferguson have called for an “applied history” movement, to better draw lessons from history and apply them to real-world problems, including through the advising of political leaders.

      What about applied anthropology as well?

      Knowledge of progress doesn't mean that it will be applied properly (at all) as the result of politics. This is one of the areas where applied anthropology would be interesting. Its also where a larger group determination of progress is important.

    1. When a product manager trusts that the engineers on the team have the interest of the product at heart, they also trust the engineer’s judgment when adding technical tasks to the backlog and prioritizing them. This enables the balanced mix of feature and technical work that we’re aiming for.

      Why is it so common for engineering teams to be mistrusted by other parts of the business?

      Part of that is definitely on engineers: chasing the new shiny, over-engineering, etc.

      That seems unlikely to account for all of it, though.

  11. Nov 2021
    1. Applying Systems Engineering to Policy

      The model to the right lacks references to a democatised control of this expert-driven decision making process, which does not reflect the increased complexity in decentralized demographics in a 'system of systems' (see p. 12).

  12. Oct 2021
    1. I didn't have to think too much of what’s good for the company - I usually assumed that whatever I’m doing is what the business needs.

      It may even be a sign that management is doing well.

  13. Sep 2021
    1. The Beloit-based billionaire has publicly pushed for tax breaks and said she wants to stop the U.S. from becoming “a socialistic ideological nation.”

      I LOVE the dysfunctional thought process of this statement. This is Social Engineering 101. An educated public not drinking the cool-aid of Neoliberalism, aristocracy or silver-spoon wealth would realize the deception of that statement simply by the fact that the US is already a socialistic ideological nation in the same way the US is already a democracy or that the US is already a capitalist ideological nation. Point being: The US is like a "mutt", meaning it's not a pure bred anything and will never be a pure anything.

      The original United States through the early 1970's represented the true American experiment and dream. The US (America) created opportunity and limited support for impoverished citizens and understood the strength and meaning of leadership (taking care of it's own). Having a somewhat balanced (more perceived) societal ideology for the US allowed America's unique nature to shine strong. Modern America (early 1980's to current) is not and should not be compared to what I call the Original America. Modern America is a nation corrupted by wealth and power. Modern America does not shine brightly anymore, the experiment is over and old school European aristocracy (wealth, status, power) rules the land. The problem is the public does not realize the extent of damage done to America and will completely forget within 2 generations.

      The baby-boomer generation is the last representation of original America and makes up the largest demographic in our nations history. Boomers hold the true America in their hearts and minds. The real Patriotism and ideology derived from the original America has become the weapon of choice for those wishing to exploit the the concept of America past. Meaningless rhetoric tied to patriotic ideals is behind the controlled social engineering of today.

      The statement above is a great example of meaningless rhetorical pandering with ambiguous words and phrases from a morally corrupt 1 to 2% of the new aristocracy grabbing power in America.

  14. Aug 2021
    1. An interesting directory of personal blogs on software and security.

      While it aggregates from various sources and allows people to submit directly to it, it also calculates a quality score/metric by using a total number of Hacker News points earned by the raw URL

      Apparently uses a query like: https://news.ycombinator.com/from?site=example.com to view all posts from HN.

  15. Jun 2021
    1. That's going to be extremely ugly. Nothing about this makes sense. Your JSON schema should just have one object that has {"is_enabled":true}, or something like this {"name":"change","is_enable":true}.
  16. May 2021
    1. My advice is if you are looking for a quick and accurate answer ask to have the trouble ticket elevated immediately and to speak with an engineer that will recognize your knowledge and speak with you on your level.
    2. I typically request to speak with an engineer when I find myself detecting an inexperienced support person.
    3. In one of my internship, I got to befriend a level 2 tech support, so learned a couple thing of how it worked (in that company). Level 1 was out-sourced, and they had a script to go from, regularly updated. From statistics, this took care of 90% of issues. Level 2 was a double handful of tech people, they had basic troubleshooting tools and knowledge and would solve 90% of the remaining issues. Level 3 was the engineering department (where I was), and as a result of level 1 and 2 efficiency less than 1% of issues ever got escalated. The process worked!
    1. Which brings us back, once again, to the question with which we began: why does it matter who gets to be seen as a prominent “tech critic”? The answer is that it matters because such individuals get to set the bounds for the discussion.

      The ability to set the bounds of the discussion or the problem is a classical example of "power-over" instead of power-with or power-to.

  17. Apr 2021
    1. Coordination: More environments require more coordination. Teams need to track which feature is deployed to which environment. Bugs need to be associated with environments. Every environment represents a particular ‘state’ of the codebase, and this has to be tracked somewhere to make sure that customers & stakeholders are seeing the right things;

      Try to remember the last time you heard one of the following phrases:

      • "Oh, I deployed it in the X environment"
      • "It was working in the stage environment"
  18. Mar 2021
    1. Sorry you’re surprised. Issues are filed at about a rate of 1 per day against GLib. Merge requests at a rate of about 1 per 2 days. Each issue or merge request takes a minimum of about 30 minutes (across at least 2 people) to analyse, put together a fix, test it, review it, fix it, review it and merge it. I’d estimate the average is closer to 3 hours than 30 minutes. Even at the fastest rate, it would take 3 working months to clear the backlog of ~1000 issues. I get a small proportion of my working time to spend on GLib (not full time).
    1. System architects: equivalents to architecture and planning for a world of knowledge and data Both government and business need new skills to do this work well. At present the capabilities described in this paper are divided up. Parts sit within data teams; others in knowledge management, product development, research, policy analysis or strategy teams, or in the various professions dotted around government, from economists to statisticians. In governments, for example, the main emphasis of digital teams in recent years has been very much on service design and delivery, not intelligence. This may be one reason why some aspects of government intelligence appear to have declined in recent years – notably the organisation of memory.57 What we need is a skill set analogous to architects. Good architects learn to think in multiple ways – combining engineering, aesthetics, attention to place and politics. Their work necessitates linking awareness of building materials, planning contexts, psychology and design. Architecture sits alongside urban planning which was also created as an integrative discipline, combining awareness of physical design with finance, strategy and law. So we have two very well-developed integrative skills for the material world. But there is very little comparable for the intangibles of data, knowledge and intelligence. What’s needed now is a profession with skills straddling engineering, data and social science – who are adept at understanding, designing and improving intelligent systems that are transparent and self-aware58. Some should also specialise in processes that engage stakeholders in the task of systems mapping and design, and make the most of collective intelligence. As with architecture and urban planning supply and demand need to evolve in tandem, with governments and other funders seeking to recruit ‘systems architects’ or ‘intelligence architects’ while universities put in place new courses to develop them.
  19. Feb 2021
    1. The Quality Engineering team is focused on creating a culture of testing, increasing test coverage, and helping the company ship high-quality features faster. We encourage all our developers to write and own end-to-end (E2E) tests. In turn, Quality Engineering (QE) is responsible for the frameworks used and provides best practices for writing reusable, scalable, and maintainable tests.

      I like this idea of "creating a culture of x", and think it helps lead to more autonomy within teams

    1. “Functional programming language” is not a clearly defined term. From the various properties that are typically associated with functional programming I only want to focus on one: “Immutability” and referential transparency.

      I mean not clearly defined seems wrong, there are common accepted characteristics that make a language functional.

  20. Dec 2020
  21. Nov 2020
  22. Oct 2020
    1. I'm okay with an overall design that allows people to plugin the parts they need in order to be able to generically support a compile-to-javascript language, but to bake in support for one singular solution because its popular is simply bad engineering.
    2. One of the primary tasks of engineers is to minimize complexity. JSX changes such a fundamental part (syntax and semantics of the language) that the complexity bubbles up to everything it touches. Pretty much every pipeline tool I've had to work with has become far more complex than necessary because of JSX. It affects AST parsers, it affects linters, it affects code coverage, it affects build systems. That tons and tons of additional code that I now need to wade through and mentally parse and ignore whenever I need to debug or want to contribute to a library that adds JSX support.
    1. Linux Memory Management at Scale

      "we had to build a complete and compliant operating system in order to perform resource control reliably"

      epic real-talk. the only people on the planet who seemed to have tamed linux for workloads. controlling memory. taming io. being on the bleeding edge, it turns out, is almost entirely about forward-progress. what can we reclaim?

      • oomd for memory protection
      • fbtax2
      • psi monitoring for io regulation
      • cgroups v2


  23. Aug 2020
    1. The timescales on which a system’s processes run have critical consequences for its ability to predict and adapt to the future.

      A layer of architecture that is too slow to change: technical debt. (Pace layering)

    2. We also know that if individuals are bad at collecting good information – if they misinterpret data due to their own biases or are overconfident in their assessments – an aggregation mechanism can compensate.

      "wisdom of crowds"

    3. market engineers introduced what’s called a ‘circuit breaker’ – a rule for pausing trading when signs of a massive drop are detected.

      Discord's slowmode or other various 'lockdowns' of communication in forums also come to mind

    1. Glasgow, A., Glasgow, J., Limonta, D., Solomon, P., Lui, I., Zhang, Y., Nix, M. A., Rettko, N. J., Lim, S. A., Zha, S., Yamin, R., Kao, K., Rosenberg, O. S., Ravetch, J. V., Wiita, A. P., Leung, K. K., Zhou, X. X., Hobman, T. C., Kortemme, T., & Wells, J. A. (2020). Engineered ACE2 receptor traps potently neutralize SARS-CoV-2. BioRxiv, 2020.07.31.231746. https://doi.org/10.1101/2020.07.31.231746

  24. Jul 2020
    1. Elon Reeve Musk FRS (/ˈiːlɒn/; born June 28, 1971) is an engineer

      There is a lot of controversy around whether or not Elon is an engineer. It has come up several times in discussion on the talk page. Personally, I wouldn't qualify him as an engineer. I think that he lacks the training and most other qualifications.

  25. Jun 2020
    1. An Idiom is a low-level pattern specific to a programming language. An idiom describes how to implement particular aspects of components or the relationships between them using the features of the given language.
    2. A Design Pattern provides a scheme for refining the subsystems or components of a software system, or the relationships between them. It describes a commonly recurring structure of communicating components that solves a general design problem within a particular context.
    3. Building blocks are what you use: patterns can tell you how you use them, when, why, and what trade-offs you have to make in doing so.
    4. patterns are considered to be a way of putting building blocks into context
    5. A "pattern" has been defined as: "an idea that has been useful in one practical context and will probably be useful in others"
  26. May 2020
    1. Fifth, the engineer is not selfish and thinks for the good of the product and the team. If you can’t work in a team, you have a harder chance to succeed nowadays.

      Setuju, selain itu menambah sudut pandang juga akan meningkatkan empati, dan jangan lupa, empati adalah sesuatu yang bisa dilatih

    2. Second, the engineer is able to apply the right amount of solution to the problem. Start with the simplest approach that solves the problem
    3. Third, the engineer has a high sense of ownership to the problem he’s solving. This way, the engineer will pay attention to the big picture as well as the details of the problem.
    4. Fourth, the engineer is able to understand how his teammates think. Let’s face it, engineering is a team sport

      Masih belum yakin, kalau team sport adalah analogi yang bagus untuk menggambarkan tim pengembang perangkat lunak

  27. Mar 2020
    1. propelled by a “water plasma” engine. Solar panels generate electrical power, which the vehicle then uses to generate microwaves, which superheat the water up to Sun-surface temperatures. That produces a plasma that shoots out a nozzle, propelling Vigoride forward.
  28. Feb 2020
    1. which they estimate to be $230,000 per year.

      There is some good discussion on HN about the realistic nature of this estimated expense and how it is not likely out-of-line with what it should be and may actually be quite reasonable.


  29. Jan 2020
    1. You do not process your projects through an Institutional Review Board, nor you are equipped to deal with persons who express trauma to you.

      This is a valid concern that needs to be addressed. While some engineers certainly do use IRB for their projects, it is not nearly as common as it should be.

    1. ericb 12 days ago | unvote [-] * Better googling. Time-restricted, url restricted, site restricted searches. Search with the variant parts of error messages removed.* Read the source of upstream dependencies. Fix or fork them if needed.* They're better at finding forks with solutions and gleaning hints from semi-related issues.* Formulate more creative hypothesis when obvious lines of investigation run out. The best don't give up.* Dig in to problems with more angles of investigation.* Have more tools in their toolbelt for debugging like adding logging, monkey-patching, swapping parts out, crippling areas to rule things out, binary search of affected code areas.* Consider the business.* Consider user-behavior.* Assume hostile users (security-wise).* Understand that the UI is not a security layer. Anything you can do with PostMan your backend should handle.* Whitelist style-security over blacklist style.* See eventual problems implied by various solutions.* "The Math."

      What do top engineers do that others don't?

      • Better googling. Time-restricted, url restricted, site restricted searches. Search with the variant parts of error messages removed.
      • Read the source of upstream dependencies. Fix or fork them if needed.
      • They're better at finding forks with solutions and gleaning hints from semi-related issues.
      • Formulate more creative hypothesis when obvious lines of investigation run out. The best don't give up.
      • Dig in to problems with more angles of investigation.
      • Have more tools in their toolbelt for debugging like adding logging, monkey-patching, swapping parts out, crippling areas to rule things out, binary search of affected code areas.
      • Consider the business.
      • Consider user-behavior.
      • Assume hostile users (security-wise).
      • Understand that the UI is not a security layer. Anything you can do with PostMan your backend should handle.
      • Whitelist style-security over blacklist style.
      • See eventual problems implied by various solutions.
      • "The Math."
  30. Dec 2019
    1. My suspicion is, a good KPI for a knowledge tool is minimum threshold of time required to make a negentropic update to it, with every halving of the threshold increasing its capacity to hold positive-interest-rate knowledge repos by an order of magnitude.

      some adhoc loss func

    2. This btw is the maker time/manager time problem pg wrote about. Making needs 4 hour chunks because anything less tends to increase entropy rather than decrease it in any non-trivial knowledge work project. So anything that lowers that lower limit is a big win.

      <4h intense focus increases entropy (more stuff, less structure) in your brain

  31. Oct 2019
  32. Sep 2019
    1. many instructional designers and others adjacent to the field have responded swiftly with critiques that range from outright rejection of the term, to general skepticism about the concept, to distrust for its advocates and their support of learning analytics and outcomes-based learning.

      Why the rejection of the term? Is it too mechanical?

  33. Aug 2019
    1. the standard AES17 dynamic range measurement

      AES17 doesn't define "dynamic range". It defines "Signal-to-noise ratio or noise in the presence of signal" which is what includes the test tone:

      The test signal for the measurement shall be a 997-Hz sine wave producing – 60 dB FS at the output of the EUT.

  34. Mar 2019
    1. Behavior Engineering Model This page has a design that is not especially attractive or user friendly but it does provide an overview of Gilbert's Behavior Engineering Model. This is a model that can be used to analyze the issues that underlie performance. A six-cell model is presented. Rating 5/5

    1. Human Performance Technology Model This page is an eight page PDF that gives an overview of the human performance technology model. This is a black and white PDF that is simply written and is accessible to the layperson. Authors are prominent writers in the field of performance technology. Rating 5/5

  35. Feb 2019
    1. INVEST

      According to this checklist, a User Story should be:

      Indepedent (of all others)

      Negociable (not a specific contract for features)

      Valuable (or vertical)

      Estimable (to a good approximation)

      Small (so as to fit within an iteration)

      Testable (in principle, even if there isn't a test for it yet)


      1. Glossary: INVEST - Agile Alliance
      2. INVEST at XP 1-2-3 by Bill Wake
  36. Nov 2018
    1. Unless you need to push the boundaries of what these technologies are capable of, you probably don’t need a highly specialized team of dedicated engineers to build solutions on top of them. If you manage to hire them, they will be bored. If they are bored, they will leave you for Google, Facebook, LinkedIn, Twitter, … – places where their expertise is actually needed. If they are not bored, chances are they are pretty mediocre. Mediocre engineers really excel at building enormously over complicated, awful-to-work-with messes they call “solutions”. Messes tend to necessitate specialization.
  37. Oct 2018
    1. If the SM58 noise floor is calculated at room temperature, the voltage output is 0.00000032 volts.

      This is equal to -130 dBV. The SM58 Vocal Microphone Specification Sheet says:

      Sensitivity (at 1,000 Hz Open Circuit Voltage) –54.5 dBV/Pa (1.85 mV)

      At this sensitivity, the self-noise would be 94 - (-54.5 - -130) = 19 dB SPL, which is pretty typical and certainly not "lower than can be typically measured".

    1. Questions about the inclusivity of engineering and computer science departments have been going on for quite some time. Several current “innovations” coming out of these fields, many rooted in facial recognition, are indicative of how scientific racism has long been embedded in apparently neutral attempts to measure people — a “new” spin on age-old notions of phrenology and biological determinism, updated with digital capabilities.
  38. Sep 2018
    1. We can’t force two people to become friends, nor should we want to.

      How many social engineers does it take to change a light bulb? An infinite number. That's why they leave you in the dark till you become the change you seek and make your own light to live by.

      If you cant force two people to become friends, then how do 'diplomats' (political manipulators?) profess to do the same thing with entire nations? Especially while so often, using the other hand to deal the deck for other players, in a game of "let's you and him fight"; or just being bloody mercenaries with sheer might is right political ethos installed under various euphemistic credos. 'My country right or wrong' or 'Mitt Got Uns' or ...to discover weapons of mass destruction...etc.

      So much for politics and social engineering, but maybe we can just be content with not so much forcing two people to be friends, as forcing them to have sex while we're filming them, so we can create more online amateur porn content. LOL ;)

  39. Aug 2018
    1. Patreon Engineering Levels

      Engineering focus, but a very detailed rubric of how to rank different personnel levels. Could maybe be generalized/adapted for other fields.

  40. Jul 2018
    1. Figure 3: Motor system with flip switch and potentiometer

      Please add a wiring diagram that would allow someone to reproduce this circuit.

    2. Figure 2: Basic demonstration of theinterior operationof the CIA device, which includedthe gear train system, rack and pinion system used for lubrication, rollers, and catheter like tubing.

      I side view of this assembly would make it easier to see how the components interact.

    1. We noticed that the people who use the data are usually not the same people who produce the data, and they often don’t know where to find the information about the data they try to use. Since the Schematizer already has the knowledge about all the schemas in the Data Pipeline, it becomes an excellent candidate to store information about the data. Meet our knowledge explorer, Watson. The Schematizer requires schema registrars to include documentation along with their schemas. The documentation then is extracted and stored in the Schematizer. To make the schema information and data documentation in the Schematizer accessible to all the teams at Yelp, we created Watson, a webapp that users across the company can use to explore this data. Watson is a visual frontend for the Schematizer and retrieves its information through a set of RESTful APIs exposed by the Schematizer.
  41. May 2018
    1. plus the impedance of the path from the inverting input to ground i.e. R1 in parallel with R2.

      This is incorrect. If R1 is infinite and R2 is 0, the parallel impedance is 0 ohms, but the input impedance is much higher than the input impedance of the op-amp itself, due to feedback making the inputs very similar in voltage.

      The input impedance is actually

      $$(1 + A_0 B)\cdot Z_\mathrm{ino}$$


      • \(A_0\) is the gain without feedback (the open loop gain)
      • \(B\) is the fraction of the output which feeds back as a negative voltage at the input
      • \(Z_\mathrm{ino}\) is input impedance without negative feedback

      For the above buffer example, it would be close to \(A_0 Z_\mathrm{ino}\)

      See https://electronics.stackexchange.com/q/177007/142

      Simpson - Introductory electronics for scientists and engineers section 7.2 Negative Voltage Feedback explains this clearly

  42. Apr 2018
    1. 10–27

      Equation 10-27 is wrong:

      • Resistors are in parallel, their noise does not sum.
    2. Adding this and the 100-kΩ resistornoise to the amplifier noise

      This is 3 terms (10 MΩ noise, 100 kΩ noise, and amplifier noise), but the equation only includes 2.

    3. 10–25

      Equation 10-25 has several errors:

      • The left and right side are not equal.
      • Resistors are in parallel, so their noise does not sum.
      • Resistor noise needs to be multiplied by gain to be combined with 113.1 μV output noise of op-amp.
    4. 10–23)

      Equation 10-23 is incorrect:

      • The noise of the resistors does not sum, since the resistors are in parallel and load each other. It would be equal to a single 50 kΩ resistor producing 4.0 μV.
      • The 113.1 value is output noise. The resistor noise needs to be multiplied by the gain to get the output noise, too.
    5. 0.1 F

      Should be 0.1 μF

    6. 0.1 F

      Should be 0.1 μF

    7. The noise calculations have many errors. See annotations on https://via.hypothes.is/http://web.mit.edu/6.101/www/reference/op_amps_everyone.pdf for details

    8. which is 100

      actually should be multiplied by the non-inverting noise gain, which is 101

    9. TLE2201

      Should be TLC2201

  43. Mar 2018
    1. Science and engineering have a long tradition of offering solutions based on natural and built processes to improve quality of life and bring prosperity.

      Language can be found related to this in many engineering codes of ethics.

    1. Figure 8 on page 22 shows OA percentages for a number of engineering disciplines. Most of which appear near the bottom of the chart.

  44. www.analog.com www.analog.com
    1. The poles of the Bessel filter can be determined by locating all of the poles on a circle and separating their imaginary parts byn2where nis the number of poles.

      This is incorrect:

      • The poles are not located on a circle
      • The imaginary parts of the poles are not equally spaced

      To generate the poles of a Bessel filter you need to use root-finding methods on the reverse Bessel polynomials. There's no other shortcut that I'm aware of.

    2. The step response shows no overshoot

      This is incorrect: There is a small amount of overshoot in Bessel filters.

  45. Oct 2017
    1. ‘DeExtinction Movement’ (The Long Now Foundation, 2014b). This project supports the genetic engineering of endangered species (altering them physically to become more resilient in the Anthropocene) and the cloning and wholesale re-creation of extinct ones—passenger pigeons, wooly mammoths—work that founder Stewart Brand promotes as ‘genetic rescue’.

      The Long Now Foundation and its views open up a whole chasm of moral, ethical, and legal questions with this 'DeExtinction Movement'. How is genetically engineering endangered species a form of 'genetic rescue'? These species are dying out because of man and man's actions, which is a terrible reflection of the worst part of human nature, but it does not give us the right to clone nature and 'whitewash' all that we have done before. Just because we may have the capacity to do so, does not mean we should. We cannot simply decide that extinction is fine because we can create genetically engineered species in the future to 'make up' for our mistakes. How are we expected to learn from our mistakes if we can simply rewind and start again?

  46. Apr 2017
    1. Dr. Ken Adam
      Dr. Kenneth Adam, who worked on the Environment Protection board during the Mackenzie Valley Pipeline Inquiry, spent the majority of his career working as a professional engineer with numerous engineering companies and private consulting firms. Some of his experiences included working for Templeton Engineering (for additional information, see the annotation for Carson Templeton), I.D. Engineering, Sentar Consultants, and Earth Tech Canada. In addition to working in industry, Dr. Ken Adam had a highly successful career in academia. He was an associate professor at the University of Manitoba working in the Department of Civil Engineering from 1972 to 1976. Dr. Ken Adam specialized in the construction of winter roads, specifically in the Canadian North. Due to his expertise, he was able to publish several articles on the construction of winter roads. The topics of his papers included the environmental impact of snow and ice roads, the development of improved snow blowers and pavers, and much more. His journal article entitled “Snow and Ice Roads: Ability to Support Traffic and Effects on Vegetation” was published in March of 1977 in the Arctic journal Volume 30 Number 1 (Adam and Hernandez 1977). He had another journal article published in the Journal (Water Pollution Control Federation) Volume 46 Number 12 entitled “Hydraulic Analysis of Winnipeg Sump Inlets” in December of 1974 (Adam and Brandson 1974). These are just two of many articles Dr. Ken Adam has published. These papers were researched and published for the government and private business. His clients included the Department of External Affairs, Indian and Northern Affairs Canada, the Izok project, the Environment Protection Board, and others. Currently, Dr. Ken Adam resides in Winnipeg, Manitoba (Elves 2009). 


      Adam, Kenneth M., and Normal B. Brandson. "Hydraulic Analysis of Winnipeg Sump Inlets." Water Environment Federation, 1974: 2755-2763.

      Adam, Kenneth, and Helios Hernandez. "Snow and Ice Roads: Ability to Support Traffic and Effects on Vegetation." Arctic, 1977: 13-27.

      Elves, Daniel. Libraries of the University of Manitoba. January 2009. https://umanitoba.ca/libraries/units/archives/collections/complete_holdings/ead/html/Adam.shtml#tag_bioghist (accessed April 9, 2017).

    2. Carson Templeton
      Carson H. Templeton was born in Wainwright, Alberta. He earned a diploma studying Mining Engineering at the Southern Alberta Institute of Technology (SAIT) in Calgary, Alberta. He worked at the Madsen Red Lake Mine in Northwest Ontario as an Assistant Assayer, Boat Boy, and Post Office Manager. He attended the University of Alberta to continue his studies of Mining Engineering and graduated with a Bachelor of Science. During World War II, Templeton worked on the Canol Pipeline Project. He then helped construct airports alongside the Alaska Highway for military use. In 1948, Templeton was appointed Assistant Chief Engineer of the Fraser Valley Dyking Board. In 1950, Templeton was appointed Chief Engineer of the Greater Winnipeg Dyking Board. In 1955, Templeton founded a consulting engineering firm which he named the Templeton Engineering Company. Before the Unicity Amalgamation of Winnipeg in 1972, his company worked as the City Engineer for several small cities in Canada. His company performed engineering estimates for the Royal Commission on Flood Cost-Benefits. These calculations led to the construction of the Winnipeg Floodway. Additionally, Carson Templeton’s consulting engineering firm conducted research that supported the writing of “Snow and Ice Roads: Ability to Support Traffic and Effects on Vegetation” by Kenneth Adam and Helios Hernandez (Adam and Hernandez 1977). In 1966, his company merged with Montreal Engineering and Shawinigan Engineering to form Teshmont Consultants Ltd. Teshmont Consultants Ltd. has completed over 50 percent of the world’s high-voltage, direct current projects. Templeton served as the Chairman of the Alaska Highway Pipeline Panel and Chairman of the Environmental Protection Board during the 1970s. As the Chairman of the Environmental Protection Board, Templeton orchestrated the hearing process for the Environmental Impact Assessments for the Mackenzie Valley Pipeline Inquiry (Winnipeg Free Press 2004). 


      Adam, Kenneth, and Helios Hernandez. "Snow and Ice Roads: Ability to Support Traffic and Effects on Vegetation." Arctic, 1977: 13-27.

      Winnipeg Free Press. Carson Templeton OC. October 10, 2004. http://passages.winnipegfreepress.com/passage-details/id-89334/Carson_Templeton_#/ (accessed April 8, 2017).

  47. Jan 2017
  48. Nov 2016
    1. The participants with relatively strong spatial abilities tended to gravitate towards, and excel in, scientific and technical fields such as the physical sciences, engineering, mathematics, and computer science.
  49. Jun 2016
    1. ensure that you’re solving the right problem

      Lots to be said about misdirected problem-solving. Much of it has to do with people who are extremely competent at their job but whose job is narrower than it could be. For instance, engineers are unbelievably adept at finding a solution to almost any problem. But it’s relatively common for them to work on “the wrong problem”, something which may not even need solving in some cases or a solution which may bring completely new problems. Those who think of the human condition as a problem to be solved may apply this type of mindset to an inappropriate extreme. Hence Soylent and VR goggles for prisoners.

    1. the only real problem remaining is the user experience that entices teachers to contribute content

      Sounds a bit restrictive. Though there are hairy UX problems making it even more difficult for teachers to contribute content, many other issues are likely to remain, preventing contributions, even if the User Experience were optimal for every single potential contributor. In other words, it’s one thing to set “the problem to be solved” in a manageable way. It’s another to grasp the complexity of the situation.

  50. May 2016