To Read Articles

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Building a B-Tree in JavaScript

Just for fun! A friend and I started developing a non professional web application called Structies, with the purpose of approaching people to the most popular data structures, in the way of being able to visualize their main operations and interact with them in a friendly way.

18 min • 9/11/2021, 9:34:44 AM

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Are Dockerfiles good enough?

For those looking for a fast overview of containers click here. Containers have quickly become the favorite way to deploy software, for a lot of good reasons. They have allowed, for the first time, developers to test "as close to production" as possible.

11 min • 9/10/2021, 4:12:16 PM

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“Find the Difference” in Python

Recently, I have been focusing on reviewing and trying out Python built-in libraries. This self-assigned task has brought me a lot of fun. There are many interesting features in Python that provide out-of-the-box implementations and solutions to different kinds of problems.

6 min • 9/10/2021, 8:07:14 AM

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I found the best anagram in English

This was easy to do, even at the time, when the word list itself, at 2.5 megabytes, was a file of significant size. Perl and its cousins were not yet common; in those days I used Awk. But the task is not very different in any reasonable language:

7 min • 9/10/2021, 8:07:12 AM

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Comparison of String Distance Algorithms

For the visualization of votings in the Bundestag I had to read in handwritten protocols of the sessions. These are unfortunately studded with typos, which is why I had to deal with different versions of one name.

4 min • 9/10/2021, 8:07:07 AM

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? min • 9/8/2021, 12:37:03 PM

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Data fragmentation and allocation algorithms for...

? min • 9/7/2021, 8:07:49 AM

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Understanding Linked Data Formats

In my previous article I discussed the power of linked data and the advantages of RDF. In this article we will explore what RDF looks like by examining its four most common formats: N-Triples, Turtle, JSON-LD and RDF/XML.

11 min • 9/6/2021, 9:37:59 AM

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Making world-class docs takes effort

Here are five requirements that I have on a project for it to reach my gold approval for stellar docs. Then something about what I’ve done recently to further improve the docs for curl.

6 min • 9/6/2021, 7:00:28 AM

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A dive into spatial search algorithms

I’m obsessed with software performance. One of my main responsibilities at Mapbox is discovering ways to make our mapping platform faster. And when it comes to processing and displaying spatial data at scale, there’s no concept more useful and important than a spatial index.

7 min • 9/1/2021, 1:06:08 PM

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GitHub Actions In Action

GitHub Actions is a great feature added to the GitHub platform. It allows an easy way to create CI/CD for our project. In this blog post, I’m going to show you how easy it is to start using GitHub Actions.

11 min • 9/1/2021, 8:22:43 AM

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? min • 8/30/2021, 8:18:24 PM

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? min • 8/30/2021, 12:06:33 PM

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How to implement a basic ActivityPub server

Today well be looking at how to connect the protocols powering Mastodon in the simplest way possible to enter the federated network.

6 min • 8/30/2021, 8:54:05 AM

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The Olympics: How to Build a Linked Data Applica...

In 2012, the BBC famously used linked data to support coverage of the London Olympics on its website, app, and interactive video player. They have continued to champion the benefits of semantic technologies to this day.

23 min • 8/29/2021, 3:35:24 PM

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Webmention

This is my site’s webmention endpoint. Send POST requests to this URL (http://csarven.ca/webmention) with source, property (optional) and target (optional) parameters, or use the form below, to let me know that you’ve linked to a URL on my site.

? min • 8/29/2021, 9:03:07 AM

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IIIF, Webmentions, and Collaboration between Ins...

This development, demo, and post were supported by a generous Implementation Grant from the IIIF Consortium. It has also been followed by related work on Linked Data Notifications.

8 min • 8/29/2021, 9:02:09 AM

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Designing a Linked Data developer experience

While the Semantic Web community was fighting its own internal battles, we failed to gain traction with the people who build apps that are actually used: front-end developers.

19 min • 8/28/2021, 11:31:53 AM

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Shaping Linked Data apps

Ever since Ed Sheeran’s 2017 hit, I just can’t stop thinking about shapes. It’s more than the earworm though: 2017 is the year in which I got deeply involved with Solid, and also when the SHACL recommendation for shapes was published.

24 min • 8/28/2021, 11:31:49 AM

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? min • 8/27/2021, 9:54:45 AM

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soog.bet

Semicolony is a series of software experiments in artificial life, conducted over the course of one year. Each experiment attempts to recreate a particular phenomenon associated with living systems as an abstract process, embedded in a virtual environment.

7 min • 8/18/2021, 4:55:17 PM

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Who says using RDF is hard?

The Linked Data ecosystem and RDF as its graph data model have been around for many years already. Even though there is an increasing interest in knowledge graphs, many developers are scared off by RDF due to its reputation of being complicated.

10 min • 8/18/2021, 4:33:56 PM

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10 rules for better dashboard design

Dashboard design is a frequent request these days. Businesses dream about a simple view that presents all information, shows trends and risky areas, updates users on what happened — a view that will guide them into a bright financial future.

10 min • 8/18/2021, 4:12:35 PM

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Predicting Occupancy on the Belgian railroads, b...

This post first appeared on medium.com. Pieter Colpaert, the #opendata specialist in Belgium did a call to the community to try and predict which train will have high occupancy.

4 min • 8/18/2021, 10:12:13 AM

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Predicting Occupancy on the Belgian railroads, b...

Pieter Colpaert, the #opendata specialist in Belgium did a call to the community to try and predict which train will have high occupancy. I am not a Data Scientist, but decided to give it a try on Azure Machine Learning, my employer’s Machine Learning offer in the Cloud.

4 min • 8/18/2021, 10:11:56 AM

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Obsessive Curiosity & Uncompromising Idealism

Moments die quickly. So when something interesting floats by in the world or in my head, I like to write it down before it evaporates. I don’t know what prompted me to write either of these notes. Finding them was like stumbling into someone else’s journal.

3 min • 8/17/2021, 1:06:44 PM

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You don’t need to work on hard problems

College, 2012—Internship recruiting season. “What are you looking for in your internship?” the recruiter asks. “I’d like to solve hard technical problems,” I reply. I end up at Jane Street writing software to calculate numeric integrals of a function that is costly to evaluate.

5 min • 8/17/2021, 11:26:19 AM

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Game timers: Issues and solutions.

When I started game programming I ran into an issue common to most aspiring game developers: The naive infinite loop resulted in variable framerate and variable time difference that made the game nondeterministic.

? min • 8/17/2021, 11:25:42 AM

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Linked Data Notifications

Status Update (May 2017): Links in the overview diagram were fixed in-place on May 22 2017: they were pointing to incorrect internal anchors. Status Update (Sep 2017): A concept URI was fixed in-place on Sep 5 22 2017: it was pointing to incorrect internal URI.

? min • 8/17/2021, 11:24:39 AM

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How I automated the boring University stuff with...

Hello, I'm a second year CS Undergrad from India. I love Python. This is my first article here on the dev.to community. So let's begin! My college has a general student - login, where students can view their profile, upload assignments, get due dates, download course materials, and stuff.

6 min • 8/16/2021, 4:58:35 PM

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When People Sleep: Determine Facebook Activity U...

It is always an interesting question and one that was posed over on the IntelTechniques.com forums.

8 min • 8/16/2021, 4:58:31 PM

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New! Automatically Discover Website Connections ...

A few years ago Lawrence Alexander published a great piece on finding connections between websites using Google Analytics (among others) codes. Last year I had published a post where I taught you how to automatically mine some of this information using Python, and then how to visualize it.

9 min • 8/16/2021, 4:58:21 PM

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#negotiation #softwareengineering #salary

I've been helping software engineers in Europe negotiate their big tech compensation offers, resulting in €20-50K/£30-50K per year increases. Here's the...

? min • 8/15/2021, 12:25:10 PM

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Achieving human-level text prediction

Estimating the entropy of the English language has long been of interest to linguists, psychologists, and information theorists alike, as this quantity describes how predictable or redundant the language is.

6 min • 8/13/2021, 7:39:55 PM

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How I Mind Map

I’ve been working on a mind mapping post for some time now. It started as a Macworld piece, but I took too long… When I need to get an idea out of my head, or I need to take that idea and flesh it out, I turn to mind maps.

19 min • 8/12/2021, 6:07:36 PM

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Research & Scientific Writing Process

While the human brain excells at establishing connections between different ideas, it is not very good at remembering specifics (especially my brain) — quite the inverse of the capabilities of computers.

8 min • 8/12/2021, 6:07:34 PM

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\(\LaTeX\) & Markdown # Like the kink? # \(\LaTeX\) , pronounced Lay-Tech, is a document writing and formatting ‘language’ that acts pretty different from MS Word.

3 min • 8/12/2021, 4:32:09 PM

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? min • 8/12/2021, 3:13:26 PM

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10 questions to ask in a job interview that will...

Spoiler alert: “What’s the culture like here?” is definitely NOT one of them.

4 min • 8/12/2021, 3:13:20 PM

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Factorio and Software Engineering

I’ve been a software engineer a while now and I can say this with confidence - it is fun. It’s great and I wouldn’t trade it for anything else. It’s so much fun that some folks try to capture the most enjoyable elements and put them into games. I’ve played two such games.

6 min • 8/12/2021, 3:13:16 PM

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Factorio and Software Engineering

I've been a software engineer a while now and I can say this with confidence - it is fun. It's great and I wouldn't trade it for anything else. It's so much fun that some folks try to capture the most enjoyable elements and put them into games. I've played two such games. The first is Shenzhen.io.

6 min • 8/12/2021, 3:13:02 PM

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Factorio Is The Best Technical Interview We Have...

There's been a lot of hand-wringing over The Technical Interview lately. Many people realize that inverting a binary tree on a whiteboard has basically zero correlation to whether or not someone is actually a good software developer.

14 min • 8/12/2021, 3:12:56 PM

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Low Bandwidth Images

So, you’ve got a website that you want to make use less bandwidth. Maybe you’re paying by the byte for content delivery, maybe you’re worried about the environment, either way, let’s assume you want to make your images as small as possible.

? min • 8/12/2021, 3:00:14 PM

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Uber’s Big Data Platform: 100+ Petabytes with Mi...

Uber is committed to delivering safer and more reliable transportation across our global markets.

23 min • 8/11/2021, 6:41:47 PM

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How Spotify Optimized the Largest Dataflow Job E...

In this post we’ll discuss how Spotify optimized and sped up elements from our largest Dataflow job, Wrapped 2019, for Wrapped 2020 using a technique called Sort Merge Bucket (SMB) join. We’ll present the design and implementation of SMB and how we incorporated it into our data pipelines.

10 min • 8/11/2021, 6:41:44 PM

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Cost-Efficient Open Source Big Data Platform at ...

As Uber’s business has expanded, the underlying pool of data that powers it has grown exponentially, and thus ever more expensive to process.

16 min • 8/11/2021, 6:41:38 PM

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Wanneer staat de eerste Belgische fintechunicorn...

Terwijl het lijkt alsof het ene Europese financiële technologiebedrijf na het andere deze zomer de miljardenstatus bereikt, blijft het vooralsnog wachten op de eerste Belgische eenhoorn in de sector. Hebben we de trein gemist, of zit er toch nog muziek in onze fintech?

8 min • 8/11/2021, 3:55:11 PM

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Generating MODS XML from RDF with Go templates

I had heard that Go (also known as “golang”) was an increasingly popular newish programming language before I migrated my blog from being generated by handmade XSLT scripts on snee.com to using the Hugo platform to generate it on bobdc.com.

10 min • 8/11/2021, 3:04:43 PM

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The web as a database: The biggest knowledge gra...

The web is among humankind's greatest achievements and resources. Ever-expanding and nearly all-encompassing, we've all come to depend on it. There's just one problem: It takes work to get information out of it.

9 min • 8/11/2021, 3:03:37 PM

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Knowledge-based Artificial Intelligence

A recent interview with a noted researcher, IEEE Fellow Michael I. Jordan, Pehong Chen Distinguished Professor at the University of California, Berkeley, provided a downplayed view of recent AI hype.

17 min • 8/11/2021, 3:03:34 PM

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Knowledge Graphs!

For several years I thought of “knowledge graphs” as the buzzphrase that had partially replaced “Linked Data”, which was the buzzphrase that had partially replaced “Semantic Web”.

9 min • 8/11/2021, 3:03:31 PM

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Linking different knowledge graphs together

Lately I’ve been thinking about some aspects of RDF technology that I have taken for granted as basic building blocks of dataset design but that Knowledge Graph fans who are new to RDF may not be fully aware of—especially when they compare RDF to alternative ways to build knowledge graphs.

10 min • 8/11/2021, 3:03:17 PM

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Pulling Turtle RDF triples from the Google Knowl...

When I wrote about my first deep dive into Knowledge Graphs, I mentioned that although the term was around well before 2012, the idea of a Knowledge Graph was blessed as an official Google thing that year when one of their engineering SVPs published the article Introducing the Knowledge Graph: thing

7 min • 8/11/2021, 3:03:14 PM

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Hidden gems included with Jena’s command line ut...

The qparse utility parses a query and can do various things with it as described by its --help option.

9 min • 8/11/2021, 3:02:26 PM

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What is RDFS?

RDFS, or RDF Schema, is a W3C standard specialized vocabulary for describing RDF vocabularies and data models.

8 min • 8/11/2021, 3:02:03 PM

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What is RDF?

I have usually assumed that people reading this blog already know what RDF is. After recent discussions with people coming to RDF from the Linked (Open) Data and Knowledge Graph worlds, I realized that it would be useful to have a simple explanation that I could point to.

10 min • 8/11/2021, 3:01:48 PM

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MyNatureWatch with a High Quality Raspberry Pi c...

I’ve been using MyNatureWatch setup on my bird table for ages now, and I really love it (you should try it). The standard setup is with a pi zero (though it works fine with other versions of the Pi too).

4 min • 8/11/2021, 3:00:51 PM

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LaTeX Thesis Skeleton

As it might be useful for other students (especially for computer science students at the University of Kaiserslautern), I decided to invest some time and create a skeleton for a thesis. The project can be found on github: http://github.com/joernhees/thesis-skeleton.

? min • 8/11/2021, 2:59:57 PM

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What's the best RDF serialization format?

Contrary to some other datamodels, RDF is not bound by a single serializiation format. Triple statements (the data atoms of RDF) can be serialized in many ways, which leaves developers with a possibly tough decision: how should I serialize my linked data?

6 min • 8/11/2021, 2:58:10 PM

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Using ontologies in Javascript apps

Ontologies are resources that describe concepts and how several classes and properties in a certain domain relate to each other.

? min • 8/11/2021, 2:58:05 PM

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Publishing Dutch governmental meetings as linked...

Open Decision Making (Open Besluitvorming in Dutch) lets you search through what has been discussed in Dutch governments.

4 min • 8/11/2021, 2:57:45 PM

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Ordered data in RDF: About Arrays, Lists, Collec...

Sooner or later when working with RDF, you’ll need to work with ordered data / n-ary relations. The subject predicate object model does not support Arrays, and no - you can’t use the order in which triples appear.

4 min • 8/11/2021, 2:53:49 PM

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Full-stack linked data: lessons from building an...

How might a web application work if it exclusively uses Linked Data (RDF) to communicate between server and client? In this article, I’ll tell you about our API journey, why we chose linked data (RDF), the challenges that we faced, and some of the solutions that we came up with.

10 min • 8/11/2021, 2:53:36 PM

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Tutorial: Building a React front-end app with RD...

This tutorial will help you build a linked data front-end application, compatible with Tim Berners-Lee’s Solid initiative. Knowledge of React and Typescript / Javascript is assumed, as is a little knowledge of RDF. For an introduction to RDF, read this.

4 min • 8/11/2021, 2:53:21 PM

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A Slice of Pi: Some Small Scale Experiments with...

There was a time when RDF and triplestores were only seen through the lens of massive data integration. Teams went to great extremes to show how many gazillion triples per second their latest development could ingest, and large integrations did likewise with enormous datasets.

5 min • 8/11/2021, 2:53:10 PM

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Smart City Ontologies: Lessons Learned from Ente...

For the last 20 years,  Semantic Arts has been helping firms design and build enterprise ontologies to get them on the data-centric path. We have learned many lessons from the enterprise that can be applied in the construction of smart city ontologies. Utility companies. Sanitation companies.

? min • 8/11/2021, 2:53:07 PM

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Processing 40 TB of code from ~10 million projec...

The command line tool I created Sloc Cloc and Code (scc) (which is now modified and maintained by many other excellent people) counts lines of code, comments and makes a complexity estimate for files inside a directory. The latter is something you need a good sample size to make good use of.

40 min • 8/11/2021, 2:36:49 PM

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Why I Turned Down My Silicon Valley Dream Offer

Ben E. C. Boyter's Blog 2018 was not a good year for me. To clarify that, it was actually the worst year of my life so far. It started well. I had the opportunity and need to learn the programming language Go which I did and then released scc https://github.

11 min • 8/11/2021, 2:36:38 PM

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How to Remove Duplicates in a Large Dataset Redu...

This is a guest repost by Suresh Kondamudi from CleverTap. Dealing with large datasets is often daunting.

3 min • 8/11/2021, 2:32:53 PM

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The case for learned index structures – Part II

The case for learned index structures Kraska et al., arXiv Dec. 2017 Yesterday we looked at the big idea of using learned models in place of hand-coded algorithms for select components of systems software, focusing on indexing within analytical databases.

8 min • 8/11/2021, 2:32:50 PM

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Elasticsearch caching deep dive: Boosting query ...

Cache is king for speedy data retrieval. So if you’re interested in how Elasticsearch leverages various caches to ensure you are retrieving data as fast as possible, buckle up for the next 15 minutes and read through this post.

13 min • 8/11/2021, 2:32:35 PM

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Stream Processing and Probabilistic Methods: Dat...

Stream processing and related abstractions have become all the rage following the rise of systems like Apache Kafka, Samza, and the Lambda architecture. Applying the idea of immutable, append-only event sourcing means we’re storing more data than ever before.

17 min • 8/11/2021, 2:32:30 PM

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Bloom Filters - Much, much more than a space eff...

A bloom filter is one of those data structures you are probably already aware of, or have at least heard about.

11 min • 8/11/2021, 2:32:24 PM

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An Old Hacker's Tips On Staying Employed

I know my core audience is expecting crusty old tales of computing past, but this time I wanted to talk about something a little more topical — about job security, whether it indeed exists in any form, and what if anything you can do to improve your odds of staying employed.

19 min • 8/11/2021, 2:30:37 PM

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Semantic Web Technologies on an Example of Famil...

The software capable of logical reasoning within some knowledge domain may seem a tech marvel. However, as it can be seen below, writing such software in Python is not difficult, if one makes use of semantic web technologies.

7 min • 8/11/2021, 11:19:09 AM

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goodreads – Medium Massage

Today I keynoted the Dutch Moodlemoot (mootnl12).

44 min • 8/10/2021, 8:47:11 PM

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Dan Carey (dancarey_404)'s profile

This Profile Is Restricted to Goodreads Users. Sign in to Goodreads to Learn More About Dan.

? min • 8/10/2021, 8:45:10 PM

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Stefan Decker's Homepage

The original Google Server consisting of 10 4GB disks and a case built out of Lego was for a while in my office in Stanford University. When organising the SWWS in Stanford Doug Engelbart contacted me to speak at the event.

? min • 8/10/2021, 8:25:32 PM

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Interviews (Audio-Visual)

Print interviews are filed under Publications/Articles. Steele, Robert, with Inteviewers, “Part 1 of 3: Trump Could be the Greatest Ever,” “Part 2: Open Source Solutions Strategy,” “Part 3: The End Game,” (YouTube, each 27 minutes), 27 February 2017.

4 min • 8/10/2021, 12:33:00 PM

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Reading List

A book on open source licensing from an engineer’s rather than a lawyer’s perspective that includes a little history of the relevant laws. Why do we have trademarks? Why do we have copyright? Etc. An overview of research findings on open innovation in the enterprise.

4 min • 8/10/2021, 12:32:01 PM

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? min • 8/10/2021, 11:19:00 AM

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Trust

Trust is a fundamental element of social capital – a key contributor to sustaining well-being outcomes, including economic development. In this entry we discuss available data on trust, as measured by attitudinal survey questions; that is, estimates from surveys asking about trusting attitudes.

17 min • 8/10/2021, 11:18:58 AM

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Accelerating Innovation — Uniting Research & Ope...

Open-source software (OSS) underpins all major cloud platforms and a large number of cloud-based services today. Core technologies that power cloud computing –Linux, Kubernetes, Cloud Foundry, Docker, to name a few –are developed in open communities.

4 min • 8/10/2021, 10:40:27 AM

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Eclectic Spacewalk #12 — Open Source Everything

Open Source Everything’s objective is to implement transparency, truth, and trust across all boundaries. Abstract: “Open Source Everything is a philosophy and a process.

37 min • 8/10/2021, 8:18:57 AM

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? min • 8/9/2021, 3:27:27 PM

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? min • 8/9/2021, 12:03:52 PM

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DIY Air Quality Sensor

It’s shaping up to be another intense season for wildfires on the West Coast. Last year, we had about 2 weeks where the air quality was bad enough that we needed to limit our time outdoors. It’s been on my mind to stock up with supplies for wildfire season.

4 min • 8/9/2021, 8:35:20 AM

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Apply conversion functions to data in SQLite col...

Earlier this week I released sqlite-utils 3.14 with a powerful new command-line tool: sqlite-utils convert, which applies a conversion function to data stored in a SQLite column. Anyone who works with data will tell you that 90% of the work is cleaning it up.

8 min • 8/7/2021, 1:43:42 PM

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How does FaceTime Work?

As an ex-pat living in Denmark, I use FaceTime audio a lot. Not only is it simple to use and reliable, but the sound quality is incredible. For those of you old enough to remember landlines, it reminds me of those but if you had a good headset.

12 min • 8/7/2021, 1:43:24 PM

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Odoo-CEO Fabien Pinckaers: ‘Wij willen slagen wa...

Op een boerderij in Wallonië bouwde ondernemer en ingenieur Fabien Pinckaers stap voor stap zijn softwarebedrijf Odoo uit tot de waardevolste techstart-up van België. De vers verworven eenhoornstatus is slechts het begin. ‘We bedienen nog maar 0,1 procent van onze markt.’

9 min • 8/4/2021, 8:54:22 AM

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B-tree Path Hints

I use a thing I call path hints in my B-tree C and Go implementations. It's a search optimization. A standard B-tree is an ordered tree-based data structure that stores its items in nodes.

? min • 7/30/2021, 8:12:02 PM

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700,000 lines of code, 20 years, and one develop...

Dwarf Fortress is one of those oddball passion projects that’s broken into Internet consciousness. It’s a free game where you play either an adventurer or a fortress full of dwarves in a randomly generated fantasy world.

10 min • 7/30/2021, 8:11:58 PM

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How I store my files and why you should not rely...

Have you ever lost important data? I have. I learned doing backups the hard way after I lost a entire book I had just finished writing! The year was 2000-something when I had just finished writing a book I had been working on for a couple of years.

11 min • 7/30/2021, 8:11:55 PM

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Towards Inserting One Billion Rows in SQLite Und...

Current Best: 100M rows inserts in 33 seconds. (you can check the source code on Github) Recently, I ran into a situation where I needed a test database with lots of rows and needed it fast. So I did what any programmer would do: wrote a Python script to generate the DB. Unfortunately, it was slow.

7 min • 7/20/2021, 8:51:35 AM

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My journey from Node to Go

It is no secret that I have a passion for Node, it’s the language that got me into development, and the one I most enjoy. As a Software Developer it’s always important to expand your horizons; whether that be learning new skills or languages.

7 min • 7/19/2021, 1:21:10 PM

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Publishing Data to the Web with Heroku and Datas...

Prerequisites You need to have the following installed on your machine: Python. I recommend using Anaconda to manage all of your python related work. Get Anaconda here and get the 3.7 version. In the instructions below, you will also be installing Homebrew if you are on a Mac.

4 min • 6/29/2021, 9:05:34 AM

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Notion – The all-in-one workspace for your notes...

? min • 6/15/2021, 3:24:37 PM

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Bringing the circus into town: the perks of Ligh...

In 1946, residents around the Lockheed Martin factory were presented with a peculiar sight. A large circus tent standing in their parking lot. No lions, or clowns within sight, but still the tent sheltered a different kind of magic.

5 min • 6/11/2021, 12:43:04 PM

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“We kunnen ondernemers goed begeleiden tijdens f...

Wil je een financieringsronde goed doen, dan weet je dat het een traject van lange adem wordt. Giet er nog een sausje stress over en je krijgt een extreem drukke periode voor de founder(s) van een onderneming.

6 min • 6/9/2021, 12:00:37 PM

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De voetballer wordt een datafabriek

De gouden generatie Rode Duivels begint volgende week op het EK aan haar wellicht laatste dans om een prijs te winnen. In het topvoetbal is almaar meer een rol als spelverdeler weggelegd voor de computer.

7 min • 6/5/2021, 1:06:12 PM