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Michiel Helvensteijn
Computer Scientist, Software Engineer, Climber, Go-player, Geek
Computer Scientist, Software Engineer, Climber, Go-player, Geek

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Pretty cool! I love go and deep learning. I wonder how this will turn out.
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Bye Terry. Loved your books!
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These are truly awesome. :-)
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This is awesome! The extent to which this seems to work is almost hard to believe.
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Playing with my new 3D printer introduced me to a whole new type of optimization problem: slicing a 3D model.

A 'slicer' is used to turn a geometric 3D model into g-code: a set of instructions for moving the print-head and extruding filament in such a way that it puts down the proper layers. One obvious metric to optimize for is print-speed: a traveling salesman problem for the print-head. More interestingly, the slicer is responsible for deciding how to fill the inside of a closed object so as to maximize strength and minimize filament usage. The good ones also determine whether the printer needs to build support structures (to be cut away later) in order to bridge large gaps.

There are a number of competing slicers out there. I wonder if there are academic papers about this.
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This post comes a bit late, but I'd like to thank everyone who was at my PhD defense with me! It was a great time and, yes, I made it. ;-)

My paranymfs organized a group gift for me: a 3D printer! Well, I had certain plans for what to do with the rest of the week, but those didn't stand a chance! I've been playing with my new printer for days.

Here are some pictures. Apart from little geometric gizmos and pop culture references, the printer can also print parts for itself! You see the print-job in progress in the first photo (with the red tape on the print-bed)? That's a fan-shroud, which you can see installed in the other picture (with the blue tape on the print-bed).

Apart from being just the best toy ever, this is going to come in handy for various little jobs. For example, I plan on printing a mounting clip to properly mount my webcam on top of my computer monitor.
3D printer: first prints
6 Photos - View album
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Hi all,

After five years of research, work and procrastination, I will finally
defend my PhD thesis, entitled:

    "Abstract Delta Modeling: Software Product Lines and Beyond",

after which I hope to receive the title of doctor. My defense takes place on:

    November 12, 2014, at 11:15

in the "Academiegebouw" of Leiden University:

    Rapenburg 73
    2311 GJ Leiden
    the Netherlands

If you happen to be in the neighborhood, feel free to drop by! :-)
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Hm... a dilemma. I'd like to order a pizza, but the pizza place has a two-for-the-price-of-one thing going on.

You see, there is no one here to eat the second pizza. I refuse to give the multinational pizza conglomerate free money, and I don't want to eat or throw away the second pizza. So... no pizza, I guess.
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"Beste Michiel,

Het is mij een waar genoegen je te kunnen meedelen dat de promotiecommisie unaniem je proefschrift heeft goed gekeurd."
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This may be the weirdest spam message I've yet received. Some excerpts:

"It is confirmed. JP.Monfort, the first Human ever to present a Candidacy to the Presidency of the Sollar System, will ask U.S. President Barack Obama to run with him as Prime Minister of Planet Earth."

"JP.Monfort continues to search for running candidates in every other planet of the Sollar System including Jupiter and Saturn. Any interested aliens can submit their expression of interest via intergalactic email (i-email)."

"This is not science fiction. We call it reality fiction."
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