Ontology-Based Rescue Operation Management

Konstantopoulos, Stasinos; Pottebaum, Jens; Schon, Jochen; Schneider, Daniel; Winkler, Thomas; Παλιούρας, Γεώργιος; Koch, Rainer

doi:10.1007/978-3-642-00440-7_11

Cited by 7 publications

(6 citation statements)

References 6 publications

(5 reference statements)

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“…At the adopted distance to HCG 7 of 56.6 Mpc (Hickson et al 1992), the only stars that are luminous enough to be detected are supergiants. Instead, star clusters are largely used as alternatives to individual stars in studying extragalactic star formation (e. g. Trancho et al 2007a;Konstantopoulos et al 2008Konstantopoulos et al , 2009Konstantopoulos 2009;Bastian et al 2009). Star clusters maintain a link to the overall star formation in any system (Lada & Lada 2003) and can therefore be used to investigate the star formation history (e. g. Oestlin et al 1998;Anders et al 2004).…”

Section: Selection and Photometry Of Star Cluster Candidatesmentioning

confidence: 99%

Galaxy Evolution in a Complex Environment: A Multi-Wavelength Study of HCG 7

Konstantopoulos

Gallagher

Федотов

et al. 2010

ApJ

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The environment where galaxies are found heavily influences their evolution. Close groupings, like the ones in the cores of galaxy clusters or compact groups, evolve in ways far more dramatic than their isolated counterparts. We have conducted a multi-wavelength study of Hickson Compact Group 7, consisting of four giant galaxies: three spirals and one lenticular. We use Hubble Space Telescope (HST ) imaging to identify and characterize the young and old star cluster populations. We find young massive clusters (YMC) mostly in the three spirals, while the lenticular features a large, unimodal population of globular clusters (GC) but no detectable clusters with ages less than a few Gyr. The spatial and approximate age distributions of the ∼ 300 YMCs and ∼ 150 GCs thus hint at a regular star formation history in the group over a Hubble time. While at first glance the HST data show the galaxies as undisturbed, our deep ground-based, wide-field imaging that extends the HST coverage reveals faint signatures of stellar material in the intra-group medium. We do not, however, detect the intra-group medium in H i or Chandra X-ray observations, signatures that would be expected to arise from major mergers. Despite this fact, we find that the H i gas content of the individual galaxies and the group as a whole are a third of the expected abundance. The appearance of quiescence is challenged by spectroscopy that reveals an intense ionization continuum in one galaxy nucleus, and post-burst characteristics in another. Our spectroscopic survey of dwarf galaxy members yields a single dwarf elliptical galaxy in an apparent stellar tidal feature. Based on all this information, we suggest an evolutionary scenario for HCG 7, whereby the galaxies convert most of their available gas into stars without the influence of major mergers and ultimately result in a dry merger. As the conditions governing compact groups are reminiscent of galaxies at intermediate redshift, we propose that HCGs are appropriate for studying galaxy evolution at z ∼ 1 − 2.

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Section: Selection and Photometry Of Star Cluster Candidatesmentioning

confidence: 99%

Galaxy Evolution in a Complex Environment: A Multi-Wavelength Study of HCG 7

Konstantopoulos

Gallagher

Федотов

et al. 2010

ApJ

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“…The population of star clusters is representative of star formation as a whole in any system (e. g. Bressert et al 2010). They are formed en masse after large events (e.g., Trancho et al 2007;Konstantopoulos et al 2008Konstantopoulos et al , 2009Konstantopoulos 2009;Bastian et al 2009) and at a slower pace at all times when a galaxy is forming stars (Lada & Lada 2003). The extreme brightness of young clusters makes them detectable to large distances and therefore a reliable tracer of the star formation history of their host galaxy over a Gyr or so.…”

Section: The High Energy Picture: Chandra-acis Observationsmentioning

confidence: 99%

The Merger History, Active Galactic Nucleus, and Dwarf Galaxies of Hickson Compact Group 59

Konstantopoulos

Gallagher

Федотов

et al. 2011

ApJ

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Compact group galaxies often appear unaffected by their unusually dense environment. Closer examination can, however, reveal the subtle, cumulative effects of multiple galaxy interactions. Hickson Compact Group (HCG) 59 is an excellent example of this situation. We present a photometric study of this group in the optical (HST ), infrared (Spitzer ) and X-ray (Chandra) regimes aimed at characterizing the star formation and nuclear activity in its constituent galaxies and intra-group medium. We associate five dwarf galaxies with the group and update the velocity dispersion, leading to an increase in the dynamical mass of the group of up to a factor of 10 (to 2.8 × 10 13 M ⊙ ), and a subsequent revision of its evolutionary stage. Star formation is proceeding at a level consistent with the morphological types of the four main galaxies, of which two are star-forming and the other two quiescent. Unlike in some other compact groups, star-forming complexes across HCG 59 closely follow mass-radius scaling relations typical of nearby galaxies. In contrast, the ancient globular cluster populations in galaxies HCG 59A and B show intriguing irregularities, and two extragalactic H ii regions are found just west of B. We age-date a faint stellar stream in the intra-group medium at ∼ 1 Gyr to examine recent interactions. We detect a likely low-luminosity AGN in HCG 59A by its ∼ 10 40 erg s −1 X-ray emission; the active nucleus rather than star formation can account for the UV+IR SED. We discuss the implications of our findings in the context of galaxy evolution in dense environments.

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“…The resulting representation abstracts away from varying orthographies and alternative or descriptive ways of referring to the same entity, such as 'nuclear power', 'atomic power' and 'power generated from nuclear fission' and also provides machineprocessable data regarding relations and events within which these entities are involved. In ontology-based information extraction (OBIE) an IE system both retrieves from and provides data to an ontology: extraction starts with a seed ontology and, in the course of the process, the extracted information is used to populate the ontology improving, in return, the performance of the IE system which exploits the populated ontology (McDowell and Cafarella, 2006;Buitelaar et al, 2008;Fragkou et al, 2008;Konstantopoulos et al, 2009).…”

Section: Ontologies As Lexical Resourcesmentioning

confidence: 99%

“…Konstantopoulos et al (2009) developed an ontology of the structure of search and rescue operations conducted by a fire brigade where they have formally defined the different unit formations involved in an operation at a given emergency level. These definitions were used to allow a decision support system to identify parts of the operation structure that are not aligned with fire brigade norms and regulations and recommend a unit reshuffling that normalizes operation structure.…”

Section: Ontology Applicationsmentioning

confidence: 99%