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Kolloquiumsvortrag: 28. März 2017, Christian Meyer

Testmanagement-Anwendung zur zentralisierten Testergebnisverarbeitung


Published on 2017-02-20 20:29:43 (Permalink)

Kolloquiumsvortrag: 7. Februar 2017: kein Termin möglich!

Published on 2017-01-23 12:50:11 (Permalink)

Kolloquiumsvortrag: 31. Januar 2017, Dominic Stellwag

USB-PPS: Messung der Interruptlatenz über USB

Ein PPS (Puls-Per-Second)-Signal ist ein hochpräzises Signal mit einer Frequenz von exakt einem Hertz. Computer-Systeme können dieses Signal aufnehmen und damit ihre eigne Uhr durch dieses externe Zeitsignal disziplinieren. Die Aufnahme erfolgt traditionell über eine serielle, parallele oder GPIO Schnittstelle, moderne Computer besitzen allerdings zunehmend ausschließlich eine USB Schnittstelle. Die einfache Übermittlung des PPS-Signals über USB bringt jedoch für die Genauigkeit des Signals nicht tolerierbare Zeiteffekte (Jitter) mit sich. Im Zuge dieser Arbeit wurde es erreicht, durch die Messung der Signallaufzeit und deren Berücksichtigung bei der Zeitstempelung, die Zeiteffekte zu minimieren und letztlich ein gültiges PPS Signal über die USB Schnittstelle zu generieren. Es wurden dafür ein USB-Device als auch ein USB-Host (Treiber) entwickelt und programmiert. A PPS (Pulse-Per-Second) signal is a high-precision signal with a frequency of exactly one Hertz. Computer systems may accept it as an external signal to discipline their internal clock. The delivery of the signal is traditionally done over the serial, parallel or GPIO interface. At the same time, increasingly modern computer hardware is exclusively equipped with a USB interface. However, the USB communication introduces some intolerable timing effects (jitter) to the original PPS signal. With this research effort, an attempt has been made to measure the transmission delay and have it reflected in the timestamping of PPS events. Eventually, it was possible to generate a viable PPS signal over USB. For this purpose, both a USB device and a USB host (driver) have been developed and programmed.   Ort: Raum 04.137, Martensstr. 3, Erlangen Zeit: 10:15

Published on 2017-01-16 10:38:42 (Permalink)

SaM1: Java introduction on 10. November

During the supervised computer hours on Thursday 10. November a brief introduction to the Java programming language will be given. This introduction is addressed to the students without any Java programming skills.

Published on 2016-11-03 15:41:14 (Permalink)

Kolloqiuumsvortrag, 19. April: Raed Kassem

Title: Simulation-Based Performance Analysis of Communication-Enabled Smart Grid Applications Abstract: Conservation Voltage Reduction, or CVR, is an important technology for saving energy. It aims to reduce the electricity consumption by lowering the service voltage to the lowest possible values. lowering the voltage must be done in a controlled manner in order to guarantee acceptable voltage at all customers along the distribution feeder and under all load conditions. The main goal of this work is to implement the necessary functions for simulating a working version of a CVR application and testing its effect on energy consumption along a distribution feeder. For this purpose, the communication framework OMNeT++ and the power system simulator OpenDSS have been related in order to control power system elements based on measured data transmitted over the communication network. A wireless communication system has been implemented in OMNeT++ between customer houses and the substation. Real-time voltage values are measured periodically at the houses and sent to a controller unit at the substation. Based on theses values the controller decides whether to lower the output voltage at the substation’s transformer. In addition, radial distribution feeders have been implemented to be a testing field for the CVR application. The results showed that on a feeder of ten houses with residential loads an energy saving of 3.4% could be achieved when applying CVR. The energy saving increases significantly while decreasing the distance between loads or with the presence of distributed generation.

Published on 2016-04-12 11:22:49 (Permalink)