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  • Portfolio
    • (Deutsch) Benchmarking
    • (Deutsch) Digitale Spedition
    • Learning system for truck drivers
    • Phone-Apps
    • (Deutsch) Lagerverwaltung für einen Großhandelskonzern
    • (Deutsch) Mobile Windkraftinspektion
    • (Deutsch) Newspaper Utilities
    • Cycosmos
    • Color management for textile printing
    • (Deutsch) Management mobiler Daten
    • Mobile education for electricians
    • (Deutsch) Notfallserver
    • Parallelize wind tunnel computing
    • Police Manuals Online
    • Programming Cookbook
    • Visualisation for Concrete Factory
  • About Karsten Meier
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Category Archives: Programming

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Saturday February 25th, 2023

Software Architecture: Layers and DTO’s

Sorry, text is curently in german only.

Posted by: Karsten Meier | Conversation: 0 comments | Category: Programming | Tags: Architektur, Java

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Sunday July 2nd, 2017

Sorry, this entry is only available in German.

Video: (Deutsch) Vier bemerkenswerte Videos zu Thema Microservices | Posted by: Karsten Meier | Conversation: 0 comments | Category: Programming | Tags: Java, Microservice

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Tuesday February 21st, 2017

(Deutsch) Back to the 60ties: Flussdiagramme

Sorry, this entry is only available in German.

Posted by: Karsten Meier | Conversation: 0 comments | Category: Programming | Tags: Diagramme, Konzeption, UX

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Tuesday January 19th, 2016

Migrate a Ruby on Rails App to Rails 4.x with “Strong Parameters”

A helpful rake task I’m just updating a three year old rails app from 3.2 to 4.2. One of the changes is that now the controller is responsible to protect against mass assignments. I think this is the right architecture, … Continue reading →

Posted by: Karsten Meier | Conversation: 0 comments | Category: Programming | Tags: Ruby, Security

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Sunday November 15th, 2015

Quantum Computing with Ruby

Few know that you already can do quantum computing with the Japanese programming language Ruby. If you have a Ruby interpreter installed on your computer, you can follow the following experiment, which is inspired by Erwin Schrödinger. (See also my … Continue reading →

Posted by: Karsten Meier | Conversation: 4 comments | Category: Programming | Tags: Traps, Cat, Quantum, Ruby

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Monday September 15th, 2014

How does the NFC-Hunt App from Google works?

Google organized a kind of scavenger hunt for the developers conference IO 2013 to demonstrate the practical use of NFC. Participants needed an NFC-enabled Android and then installed an app called “NFC Hunt”. The app gives clues where to find … Continue reading →

Posted by: Karsten Meier | Conversation: 0 comments | Category: Mobile, Programming | Tags: Adventure, Android, NFC

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Tuesday November 19th, 2013

Rotating Billboard with CSS-Animations

(Deutsch) Wie man Bilder auf Webseiten sich rotierend austauschen lässt, ohne JavaScript, nur mit CSS. Continue reading →

Posted by: Karsten Meier | Conversation: 0 comments | Category: Programming | Tags: Animation, CSS, UX

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Wednesday September 25th, 2013

JavaScript Incompatibilities in Webapps

(Deutsch) Zwei Inkompatibilitäten aus einem praktischen Projekt: Datumsfunktionen sind bei älteren Android-Geräten unvollständig, und die prompt-Methode wird von Microsoft still unterdrückt. Continue reading →

Posted by: Karsten Meier | Conversation: 0 comments | Category: Mobile, Programming | Tags: Android, JavaScript, webapp

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Wednesday October 24th, 2012

Codename One – Swap Grid Cells

What is Codename One? The platform “Codename One” offers operating system-independent development of apps for smartphones. An important component is a library for user interfaces. Codename One is a successor of LWUIT, which in turn uses concepts of the Java … Continue reading →

Posted by: Karsten Meier | Conversation: 0 comments | Category: Mobile, Programming | Tags: Codename One, Java, LWUIT

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Wednesday August 8th, 2012

Presentation About Rails Database Optimization

Here are the English slides about how to optimize database queries in Ruby On Rails. I have showed this presentation at the Ruby User Group Hamburg at the 9th August 2012.

Posted by: Karsten Meier | Conversation: 0 comments | Category: Programming | Tags: Orm, Performance, Ruby, scaling, Sql, Presentation

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About me

Hello, my name is Karsten Meier. I'm a computer scientist from Hamburg, Germany. I write since 1996 for this website about topics from life with big and small computers. And sometimes I use this site for experiments.

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Adventure Android AppEngine Challenge China Cloud CoCreation CSS Culture Design Diagramme e-learning Enterprise Gadgets Google Ilias Innovation IOT Java JavaScript JME jQuery Konzeption LMS LWUIT Mapplet MDM MFP multilingualism Mystery NFC Performance Php Python quality assurance Ruby scaling Security Smart City Sql Strings Traps UX Validations webapp

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Stack Overflow

profile for Meier at Stack Overflow, Q&A for professional and enthusiast programmers

Projects

  • Colleta
  • Coobeya
  • Handylearn Projects
  • mlearning

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