Archive for the ‘Uncategorized’ Category

Having Fun with the 1&1 Internet Flatrate

April 2nd, 2011 Comments off

This entry is only available in German.

Vor zwei Monaten habe ich mir als 1und1-Stammkunde auch die Mobile Internet Flatrate zugelegt: Für 9,99 Euro im Monat gibt es 1 GByte Freivolumen mit voller Geschwindigkeit (ca. 7 MBit/s), jenseits des ersten GByte aktiviert 1und1 eine Drosselung auf ISDN-Geschwindigkeit.

Wie weit man schon bzgl. des 1-GByte-Limits ist, kann man auf phänomenal und phantastisch einfache Weise im “Kontrollzentrum” feststellen: Es sind nur knapp 20 Schritte dazu notwendig, die ich gleich beschreiben werde. Dass es so super einfach ist, so dass der typische Kunde wohl nie wissen wird, wann er sich er 1-GByte-Grenze nähert, liegt an etwas ganz Genialem: Es gibt zwei Abrechnungszeiträume:

  • einen von 1und1 (in diesem Rhythmus kommen die Rechnungen, bei mir z. B. immer vom 08. eines Monats bis zum nächsten 08.)
  • und einen weiteren vom Partner Vodafone, der laut 1und1 fest vom 22. eines Monats bis zum nächsten 22. läuft.

Auf Nachfrage findet 1und1 das offenbar ganz in Ordnung, denn eine Synchronisation dieser beiden Abrechnungszeiträume, welche das Problem beheben würde, möchte man dort nicht durchführen (siehe unten: Reaktion von 1und1).

Hier geht’s zum vollständigen Bericht.

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Working on my PhD thesis

August 5th, 2010 Comments off

In October 2010, I’ll start on my new job as Research Assistant at University of Erlangen-Nuremburg. My doctoral adviser, Prof. Felix Freiling, will head the Chair of IT Security Infrastructures.

I’ll adjust my current research area (new methods of teaching operating systems principles) a bit by including security-related topics. One of the things I consider is creating a course on operating systems which focuses on security-relevant aspects of OS functions.

Hopefully my research will lead to gaining a PhD at the end of approx. three years :)

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Teaching VBA macro programming

November 13th, 2009 Comments off

Since September 2009 I’ve been working as a teacher – after almost ten years as editor-in-chief of a Linux magazine. The subjects I teach are maths and computer science, and this year CS means object-oriented programming. The school offers Windows machines only, so I’m stuck with that platform.

However, when I tought an Introduction to CS course at Munich University of Applied Sciences about 1.5 years ago, I opted for Excel macro programming (VBA) instead of the also available OpenOffice macro language, and I actually liked what I saw there, and now I can recycle some of my lecture concepts in my school lessons.

Why would I, being a Linux enthusiast, choose Microsoft’s macro language over the open source OpenOffice macro language? VBA is much more accessible for programming newbies. While the languages themselves are pretty similar dialects of Basic, the object model that OpenOffice uses to access document content requires very profound insights and cannot be explained in a few hours. (Try to do something with the current selection in Excel and in OOo Calc to see what I mean.) The VBA object model for Excel documents might be flawed in comparison (as many people like to point out), but it’s fairly easy to understand, and when teaching VBA, I can get pupils to write useful macros in a few hours.

There is certainly a long list of things that I prefer in OpenOffice (think of the terrible new GUI for Microsoft Office, think of easy PDF export in OOo), but the macro language isn’t one of them.

Are there any (free/open source) object-oriented languages out there that you would suggest to use for teaching programming to school pupils aged 17 with no prior programming experience? I’d like to switch to something different next year.

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Hey, it’s a blog

May 23rd, 2009 1 comment

Ok, after using Blosxom for a few years, I wanted to try out a “true” blog – so here it is, powered by WordPress. Installation was simple so far, let’s see where this will lead. There’s a world of a difference between writing new posts in the vi editor and using the wysiwyg editor of WordPress. While it’s nice to have an editor that behaves like a text processor, I’ve certainly been a bit faster with the simple one. But then, with WordPress you can have feedback which isn’t possible with Blosxom.

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