Andreas Koch

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Geometric algebra (GA) is a mathematical framework that allows the compact description of geometric relationships and algorithms in many fields of science and engineering. The execution of these algorithms, however, requires significant computational power that made the use of GA impractical for many real-world applications. We describe how a GA-based(More)
We present a low-level infrastructure for use by high-level language to hardware compiler back-ends. It consists of the highly parameterizable, technology-independent module library Modlib and the LMEM framework for localizing variables in fast on-chip memories. Modlib not only supports all high-level language operators (including memory accesses), but also(More)
There has long been evidence that low-mass galaxies are systematically larger in radius, of lower central stellar mass density, and of lower central phase-space density, than are star clusters of the same luminosity. The larger radius, at a comparable value of central velocity dispersion, implies a larger mass at similar luminosity, and hence significant(More)
X-ray detectors for imaging with a spatial resolution in the micrometer and submicrometer range have been developed at synchrotron radiation sources since 1996. The detectors consist of a scintillator, a light microscopy optic and a charge-coupled device (CCD). The scintillator converts part of the X-ray stopped by a material into a visible-light image(More)
We present a photometric analysis of the star clusters Lindsay 1, Kron3, NGC339, NGC416, Lindsay38, and NGC419 in the Small Magellanic Cloud (SMC), observed with the Hubble Space Telescope Advanced Camera for Surveys (ACS) in the F555W and F814W filters. Our color magnitude diagrams (CMDs) extend ∼3.5 mag deeper than the main-sequence turnoff points, deeper(More)
We present Gaalop (Geometric algebra algorithms optimizer), our tool for high performance computing based on Conformal Geometric Algebra (GA). The main goal of Gaalop is to realize implementations that are most likely faster than conventional solutions. We describe the concepts, the state-of-the-art as well as the future perspectives of Gaalop dealing with(More)
The Carina dwarf spheroidal galaxy is the only galaxy of this type that shows clearly episodic star formation separated by long pauses. Here we present metallicities for 437 radial velocity members of this Galactic satellite. The metallicities and radial velocities were measured as part of a Large Programme with the Very Large Telescope at the European(More)
We propose an execution model that orchestrates the fine-grained interaction of a conventional general-purpose processor (GPP) and a high-speed reconfigurable hardware accelerator (HA), the latter having full master-mode access to memory. We then describe how the resulting requirements can actually be realized efficiently in a custom computer by hardware(More)