Erwin Müller Blog

Forecast Project

Forecast Derivation 1

Forecast Project h2. Scope and Vision The Forecast software is using numerical integration and differentiation to find structures in a sequence of signal samples. The first-difference differentiator is used to calculate the differentiation: To see the structures in the signal samples the data is sorted first for each row by the natural order of the…

Global Scaling Calculator Suite

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For the last couple of weeks I was working on a new version of the Global Scaling Calculator application. The new version is designed to solve the issues with the last two Global Scaling Calculator applications, the Calculator and the Sound Generator. The first major issue is that it is not possible to analyze multiple…

SMTP Test Tool Swaks

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The well known method to test a SMTP setup is _telnet_ tool, but the disadvantage is that you have to know the SMTP protocol. The following examples are to test a SMTP server for receiving and sending emails. But to test attachments and TLS, and more advanced options _telnet_ is less adequate. _Swaks_ is developed…

Install Redmine on Nginx/Thin Guide

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h2. Introduction We will install Redmine project management web application that is proxied by the Nginx web server and is run with the Thin Ruby web server. As the Linux server I used Ubuntu 12.04 LTS. Redmine will be served on the domain protected by TLS/SSL. Redmine will be installed under the @/var/www@ directory, under…

Global POM Utilities Core

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h2. Global POM Utilities Core The Java library contains various tools to convert lists, URI, to format and parse various types, to parse accelerator mnemonic keys, to search and replace texts, etc. h3. Classes Overview | c.a.globalpom.arrays[1]. | ToList | Methods to convert an array to a list. | | c.a.globalpom.charset | SerializableCharset | Serialize…

Continued Fraction Calculator

Continued Fraction Calculator Screenshot

To calculate the continued fraction from a specified value and to compare two different continued fractions I have implemented the continued fraction calculator library can command line application @fractionscli.@ The application is available under the “GPLv3″:https://www.gnu.org/copyleft/gpl.html license free of charge. The calculator can either be installed using the setup program or the @Jar@ file can…

Gitit Installation

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h1. Gitit Installation “Gitit”:http://gitit.net/ ist eine Wiki-Software in dem Stil von “Mediawiki”:http://www.mediawiki.org/ die z.B. von Wikipedia benutzt wird. Das besondere an _Gitit_ ist dass es viele verschiedene Formatte für das erstellen der Artikel und viele Exportformate unterstützt. Ebenso besonders ist es, dass _Gitit_ keine Datenbank benutzt, sondern die Artikel im Dateisystem ablegt und die “Git”:http://git-scm.com/…

Robo Bee Introduktion

h2. Services Ein Linuxserver hat mehrere sogenannte Services, die jeweils eine Aufgabe auf dem Server erledigen. Die Services kann man in Kategorien einordnen, wie z.B. Netzwerk, Firewall, DNS, Mail, Web, usw. Mehrere Implementierungen können diese Services zur Verfügung stellen. “BIND”:https://www.isc.org/downloads/bind/ ist der wohl am meisten bekannter DNS Server, aber als Alternative steht auch “MaraDNS”:http://www.maradns.org/ zur…