Refine
Year of publication
- 2011 (2) (remove)
Document Type
- Article (1)
- Monograph/Edited Volume (1)
Language
- English (2)
Is part of the Bibliography
- yes (2)
Keywords
- Architektur (1)
- Softwareproduktlinien (1)
- Virtual machines (1)
- Virtuelle Maschinen (1)
- architecture (1)
- cosmology: dark matter, large-scale structure of the Universe (1)
- galaxies: groups, clusters (1)
- mehrdimensionale Belangtrennung (1)
- multi-dimensional separation of concerns (1)
- software product lines (1)
CSOM/PL is a software product line (SPL) derived from applying multi-dimensional separation of concerns (MDSOC) techniques to the domain of high-level language virtual machine (VM) implementations. For CSOM/PL, we modularised CSOM, a Smalltalk VM implemented in C, using VMADL (virtual machine architecture description language). Several features of the original CSOM were encapsulated in VMADL modules and composed in various combinations. In an evaluation of our approach, we show that applying MDSOC and SPL principles to a domain as complex as that of VMs is not only feasible but beneficial, as it improves understandability, maintainability, and configurability of VM implementations without harming performance.
The SDSS galaxy catalog is one of the best databases for galaxy distribution studies. The SDSS DR8 data is used to construct the galaxy cluster catalog. We construct the clusters from the calculated luminosity density field and identify denser regions. Around these peak regions we construct galaxy clusters. Another interesting question in cosmology is how observable galaxy structures are connected to underlying dark matter distribution. To study this we compare the SDSS DR7 galaxy group catalog with galaxy groups obtained from the semi-analytical Millennium N-Body simulation. Specifically, we compare the group richness, virial radius, maximum separation and velocity dispersion distributions and find a relatively good agreement between the mock catalog and observations. This strongly supports the idea, that the dark matter distribution and galaxies in the semi-analytical models and observations are very closely linked.