TY - JOUR A1 - Steinkirchner, Alfons A1 - Fuhrmann, Thomas A1 - Niemetz, Michael T1 - Channel Coded Processor for Enhanced Safety JF - International Journal of Future Computer and Communication (IJFCC) N2 - Several concepts are known for improving processor safety, all of them having their pros and cons. Some are very resource intensive, others have limited capabilities regarding the provided error safety. In this paper we use research on channel coding of noisy communication channels known from communication theory as an analogy to random bit errors in processors. We incorporate this knowledge into processor design to suggest a new error correction concept by using channel coding in processors. The new concept of a Channel Coded Processor could provide effective implementation of redundancy by the channel coding that enables error correction. The concept could also create a complete chain of redundancy in all areas and components of the processor ranging from the code compiler through the processing hardware to the output of the information. KW - Channel coded processor concept KW - communication theory KW - safety KW - soft error Y1 - 2017 U6 - https://doi.org/10.18178/ijfcc.2017.6.2.489 SN - 2010-3751 VL - 6 IS - 2 SP - 58 EP - 62 PB - International Association of Computer Science and Information CY - Singapore ER - TY - CHAP A1 - Niemetz, Michael A1 - Fuhrmann, Thomas T1 - Wie können wir Professorinnen und Professoren ein überfachliches Studium vermitteln? T2 - Tagungsband zum 3. Symposium zur Hochschullehre in den MINT-Fächern (MINT-Symposium), Nürnberg 25. und 26.09.2017 N2 - Die Transdisziplinarität ist als wichtiger Innovationsmotor in aller Munde, entstehen doch an den Schnittstellen und in den Zwischenräumen der etablierten Wissenschaften neue Ideen und damit die zukünftige Wertschöpfung unserer Industrie. Wir alle wurden in der Welt von gestern sozialisiert, für die meisten Tätigkeiten in der Industrie war tiefes und spezialisiertes Fachwissen essentiell und auch ausreichend. Wir wurden zu Spezialisten ausgebildet und aufgrund dieser Kompetenz in der Arbeitswelt geschätzt und auch auf unsere Professuren berufen. Doch ist dies eine ausreichende Basis, um unsere Absolventinnen und Absolventen auf die neue komplexe Welt ubiquitär verfügbaren und durchsuchbaren Wissens adäquat vorzubereiten? Können wir mit unserem Mindset aus der Vergangenheit die benötigten überfachlichen Kompetenzen für die Zukunft vermitteln? Diese selbstkritische Auseinandersetzung ist schmerzhaft, doch nur durch diese Analyse können wir unsere alten Denkmuster in engen Fachdisziplinen ablegen und zu einem neuen vernetzten Denken für eine zukunftsgerichtete Lehre kommen. Y1 - 2017 UR - https://www.researchgate.net/publication/323119092_Wie_konnen_wir_Professorinnen_und_Professoren_ein_uberfachliches_Studium_vermitteln UR - https://didaktikzentrum.de/images/cwattachments/381_c76aeb3b834947e657aef252c88f6e62.pdf ER - TY - JOUR A1 - Niemetz, Michael A1 - Hänninen, Risto A1 - Schoepe, Wilfried T1 - On the Transition from Potential Flow to Turbulence Around a Microsphere Oscillating in Superfluid 4He JF - Journal of low temperature physics N2 - The flow of superfluid around a translationally oscillating sphere, levitating without mechanical support, can either be laminar or turbulent, depending on the velocity amplitude. Below a critical velocity that scales as and is temperature independent below 1 K, the flow is laminar (potential flow). Below 0.5 K, the linear drag force is caused by ballistic phonon scattering that vanishes as until background damping, measured in the empty cell, becomes dominant for K. Increasing the velocity amplitude above leads to a transition from potential flow to turbulence, where the large turbulent drag force varies as . In a small velocity interval % above , the flow is unstable below 0.5 K, switching intermittently between both patterns. From time series recorded at constant temperature and driving force, the lifetimes of both phases are analyzed statistically. We observe metastable states of potential flow which, after a mean lifetime of 25 min, ultimately break down due to vorticity created by natural background radioactivity. The lifetimes of the turbulent phases have an exponential distribution, and the mean increases exponentially with . We investigate the frequency at which the vortex rings are shed from the sphere. Our results are compared with recent data of other authors on vortex shedding by moving a laser beam through a Bose-Einstein condensate. Finally, we show that our observed transition to turbulence belongs to the class of "supertransient chaos" where lifetimes of the turbulent states increase faster than exponentially. KW - Bose-Einstein condensates KW - Critical velocity KW - DYNAMICS KW - EINSTEIN CONDENSED GAS KW - HE-4 KW - HELIUM KW - LAMINAR KW - MK TEMPERATURES KW - ONSET KW - Oscillatory flow KW - Quantum turbulence KW - Superfluid helium KW - Vortex shedding Y1 - 2017 U6 - https://doi.org/10.1007/s10909-017-1745-7 VL - 187 IS - 3-4 SP - 195 EP - 220 PB - Springer Nature ER -