Laulu valon sodassa

Soitinnus: lauluääni, piano.

Maggiolata

Soitinnus: lauluääni.

Engineering of Business Critical Web Applications

Research focus of this thesis is to explore options for building systems for business critical web applications. Business criticality here includes requirements for data protection and system availability. The focus is on open source software. Goals are to identify robust technologies and engineering practices to implement such systems. Research methods include experiments made with sample systems built around chosen software packages that represent certain technologies. The main research focused on finding a good method for database data replication, a key functionality for high-availability, database-driven web applications. Research included also finding engineering best practices from books written by administrators of high traffic web applications. Experiment with database replication showed, that block level synchronous replication offered by DRBD replication software offered considerably more robust data protection and high-availability functionality compared to leading open source database product MySQL, and its built-in asynchronous replication. For master-master database setups, block level replication is more recommended way to build high-availability into the system. Based on thesis research, building high-availability web applications is possible using a combination of open source software and engineering best practices for data protection, availability planning and scaling.

[Donde lieta usci]

Soitinnus: lauluääni (sopraano), piano.

Kevätlaulu

Sovitus Giovanni Giacomo Gastoldin sävelmästä.

Marechiare

Soitinnus: lauluääni, piano.

[Hyräilykuoro oopperasta Madama Butterfly]

Soitinnus: sekakuoro, orkesteri.

[Balladi oopperasta Afrikatar]

Soitinnus: lauluääni (baritoni), orkesteri.

[Aaria oopperasta Boheme]

Soitinnus: lauluääni (tenori), orkesteri.

[Aaria oopperasta Turandot]

Soitinnus: lauluääni (tenori), orkesteri.

[Aaria oopperasta Tosca]

Soitinnus: lauluääni (baritoni), sekakuoro, orkesteri.

[Vittoria mio core = Voiton oot saava]

Soitinnus: lauluääni (tenori), orkesteri.

[Duetto oopperasta La Bohème]

Soitinnus: Lauluäänet (sopraano, tenori), orkesteri.

Robust current control of a phase shifted full-bridge buck converter

In this thesis, the main point of interest is the robust control of a DC/DC converter. The use of reactive components in the power conversion gives rise to dynamical effects in DC/DC converters and the dynamical effects of the converter mandates the use of active control. Active control uses measurements from the converter to correct errors present in the converter’s output. The controller needs to be able to perform in the presence of varying component values and different kinds of disturbances in loading and noises in measurements. Such a feature in control design is referred as robustness. This thesis also contains survey of general properties of DC/DC converters and their effects on control design. In this thesis, a linear robust control design method is studied. A robust controller is then designed and applied to the current control of a phase shifted full bridge converter. The experimental results are shown to match simulations.

Il disegno della geografia moderna de tutta la parte dell'Africa i confini della quale stanno in questo modo, da ponente il mar'oceano computate l'isole di Capo Verde, et le Canarie da Tramontana il Stretto Gibelterra, et il Mare Meditteraneo ...

Kartta kuuluu A. E. Nordenskiöldin kokoelmaan