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A new sufficient schedulability analysis for hybrid scheduling

Zhang F., Zhai Y., Liao J.

International Journal of Applied Mathematics and Computer Science

2016

Vol. 26, no. 3

683--692

Earliest deadline first (EDF) and fixed priority (FP) are the most commonly used and studied scheduling algorithms for real-time systems. This paper focuses on combining the EDF and FP strategies in one system. We provide a new sufficient schedulability analysis for real-time hybrid task systems which are scheduled by EDF and FP. The proposed analysis has a polynomial time complexity and no restrictions on task parameters, where the relative deadline of each task could be less than, equal to, or greater than its period. By extensive experiments, we show that our proposed analysis significantly improves the acceptance ratio compared with the existing results of the sufficient schedulability test for hybrid scheduling systems.

New data on chondrichthyan microremains from the Givetian of the Renanue section in the Aragonian Pyrenees (Spain)

Ginter M., Liao J., Valenzuela-Rios J.

Acta Geologica Polonica

2008

Vol. 58, no. 2

165-172

The continued investigations on the Middle Devonian part (Givetian, Middle through Upper Polygnathus varcus conodont Zones) of the section near the Renanue village in the Aragonian Pyrenees, Spain, brought twelve teeth of chondrichthyan taxa typical of the so-called "Omalodus shark assemblage" (Omalodus grabaui, Phoebodus fastigatus, Ph. sophiae, and probably Antarctilamna sp., the first record of Antarctilamna from the Givetian of Europe) previously known from a few places in Laurussia and North Gondwana. This taxonomic composition resembles the most that of the North Evans Limestone from New York. The species represent three different families and orders: Omalodontidae nov. (Omalodontiformes), Phoebodontidae (Phoebodontiformes), and Antarctilamnidae nov. (Antarctilamniformes nov.). In addition to the teeth of the listed taxa, several chondrichthyan scales of the "ctenacanth" type were found.