@inproceedings{OhrnbergerWassermannRichter2006, author = {Ohrnberger, Matthias and Wassermann, Joachim and Richter, Gudrun}, title = {Automatic detection and classification of seismic signals for monitoring purposes}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-7294}, year = {2006}, abstract = {Interdisziplin{\"a}res Zentrum f{\"u}r Musterdynamik und Angewandte Fernerkundung Workshop vom 9. - 10. Februar 2006}, language = {en} } @inproceedings{IgnaceGayley2007, author = {Ignace, R. and Gayley, K. G.}, title = {Circumstellar Magnetic Field Diagnostics from Line Polarization}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-18066}, year = {2007}, language = {en} } @inproceedings{MillsHealey2006, author = {Mills, Gregory J. and Healey, Patrick G. T.}, title = {Clarifying spatial descriptions : local and global effects on semantic co-ordination}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-10414}, year = {2006}, abstract = {A key problem for models of dialogue is to explain the mechanisms involved in generating and responding to clarification requests. We report a 'Maze task' experiment that investigates the effect of 'spoof' clarification requests on the development of semantic co-ordination. The results provide evidence of both local and global semantic co-ordination phenomena that are not captured by existing dialogue co-ordination models.}, language = {en} } @inproceedings{Reimer2007, author = {Reimer, A.}, title = {Clumping effects on non-thermal particle spectra in massive star systems}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-18246}, year = {2007}, abstract = {Observational evidence exists that winds of massive stars are clumped. Many massive star systems are known as non-thermal particle production sites, as indicated by their synchrotron emission in the radio band. As a consequence they are also considered as candidate sites for non-thermal high-energy photon production up to gamma-ray energies. The present work considers the effects of wind clumpiness expected on the emitting relativistic particle spectrum in colliding wind systems, built up from the pool of thermal wind particles through diffusive particle acceleration, and taking into account inverse Compton and synchrotron losses. In comparison to a homogeneous wind, a clumpy wind causes flux variations of the emitting particle spectrum when the clump enters the wind collision region. It is found that the spectral features associated with this variability moves temporally from low to high energy bands with the time shift between any two spectral bands being dependent on clump size, filling factor, and the energy-dependence of particle energy gains and losses.}, language = {en} } @inproceedings{LiermannHamann2007, author = {Liermann, A. and Hamann, Wolf-Rainer}, title = {Clumping in Galactic WN stars : a comparison of mass loss rates from UV/optical \& radio diagnostics}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17816}, year = {2007}, abstract = {The mass loss rates and other parameters for a large sample of Galactic WN stars have been revised by Hamann et al. (2006), using the most up-to date Potsdam Wolf-Rayet (PoWR) model atmospheres. For a sub-sample of these stars exist measurements of their radio free-free emission. After harmonizing the adopted distance and terminal wind velocities, we compare the mass loss rates obtained from the two diagnostics. The differences are discussed as a possible consequence of different clumping contrast in the line-forming and radio-emitting regions.}, language = {en} } @inproceedings{OPUS4-1574, title = {Clumping in hot-star winds : proceedings of an international workshop held in Potsdam, Germany, 18. - 22. June 2007}, editor = {Hamann, Wolf-Rainer and Feldmeier, Achim and Oskinova, Lida}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-940793-33-1}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-13981}, pages = {254}, year = {2007}, abstract = {Stellar winds play an important role for the evolution of massive stars and their cosmic environment. Multiple lines of evidence, coming from spectroscopy, polarimetry, variability, stellar ejecta, and hydrodynamic modeling, suggest that stellar winds are non-stationary and inhomogeneous. This is referred to as 'wind clumping'. The urgent need to understand this phenomenon is boosted by its far-reaching implications. Most importantly, all techniques to derive empirical mass-loss rates are more or less corrupted by wind clumping. Consequently, mass-loss rates are extremely uncertain. Within their range of uncertainty, completely different scenarios for the evolution of massive stars are obtained. Settling these questions for Galactic OB, LBV and Wolf-Rayet stars is prerequisite to understanding stellar clusters and galaxies, or predicting the properties of first-generation stars. In order to develop a consistent picture and understanding of clumped stellar winds, an international workshop on 'Clumping in Hot Star Winds' was held in Potsdam, Germany, from 18. - 22. June 2007. About 60 participants, comprising almost all leading experts in the field, gathered for one week of extensive exchange and discussion. The Scientific Organizing Committee (SOC) included John Brown (Glasgow), Joseph Cassinelli (Madison), Paul Crowther (Sheffield), Alex Fullerton (Baltimore), Wolf-Rainer Hamann (Potsdam, chair), Anthony Moffat (Montreal), Stan Owocki (Newark), and Joachim Puls (Munich). These proceedings contain the invited and contributed talks presented at the workshop, and document the extensive discussions.}, language = {en} } @inproceedings{PulsMarkovaNajarroetal.2007, author = {Puls, Joachim and Markova, N. and Najarro, F. and Hanson, M. M.}, title = {Clumping in O-star winds}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17683}, year = {2007}, abstract = {We review various diagnostics of clumping in O-star winds, with special emphasis on its radial stratification. Implications and problems are discussed, and promising NIR methods are presented.}, language = {en} } @inproceedings{BouretLanzHillieretal.2007, author = {Bouret, J.-C. and Lanz, T. and Hillier, D. J. and Foellmi, C.}, title = {Clumping in O-type Supergiants}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17662}, year = {2007}, abstract = {We have analyzed the spectra of seven Galactic O4 supergiants, with the NLTE wind code CMFGEN. For all stars, we have found that clumped wind models match well lines from different species spanning a wavelength range from FUV to optical, and remain consistent with Hα data. We have achieved an excellent match of the P V λλ1118, 1128 resonance doublet and N IV λ1718, as well as He II λ4686 suggesting that our physical description of clumping is adequate. We find very small volume filling factors and that clumping starts deep in the wind, near the sonic point. The most crucial consequence of our analysis is that the mass loss rates of O stars need to be revised downward significantly, by a factor of 3 and more compared to those obtained from smooth-wind models.}, language = {en} } @inproceedings{UrbanejaKudritzkiPuls2007, author = {Urbaneja, M. A. and Kudritzki, R.-P. and Puls, Joachim}, title = {Clumping in the winds of O-type CSPNs}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17801}, year = {2007}, abstract = {Recent studies of massive O-type stars present clear evidences of inhomogeneous and clumped winds. O-type (H-rich) central stars of planetary nebulae (CSPNs) are in some ways the low mass-low luminosity analogous of those massive stars. In this contribution, we present preliminary results of our on-going multi-wavelength (FUV, UV and optical) study of the winds of Galactic CSPNs. Particular emphasis will be given to the clumping factors derived by means of optical lines (Hα and Heii 4686) and "classic" FUV (and UV) lines.}, language = {en} } @inproceedings{BandaGallagher2010, author = {Banda, Gourinath and Gallagher, John P.}, title = {Constraint-based abstraction of a model checker for infinite state systems}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-41516}, year = {2010}, abstract = {Abstract interpretation-based model checking provides an approach to verifying properties of infinite-state systems. In practice, most previous work on abstract model checking is either restricted to verifying universal properties, or develops special techniques for temporal logics such as modal transition systems or other dual transition systems. By contrast we apply completely standard techniques for constructing abstract interpretations to the abstraction of a CTL semantic function, without restricting the kind of properties that can be verified. Furthermore we show that this leads directly to implementation of abstract model checking algorithms for abstract domains based on constraints, making use of an SMT solver.}, language = {en} } @inproceedings{deKoterVinkMuijres2007, author = {de Koter, A. and Vink, J. S. and Muijres, L.}, title = {Constraints on wind clumping from the empirical mass-loss vs. metallicity relation for early-type stars}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17736}, year = {2007}, abstract = {We present the latest results on the observational dependence of the mass-loss rate in stellar winds of O and early-B stars on the metal content of their atmospheres, and compare these with predictions. Absolute empirical rates for the mass loss of stars brighter than 10\$^{5.2} L_{\odot}\$, based on H\$\alpha\$ and ultraviolet (UV) wind lines, are found to be about a factor of two higher than predictions. If this difference is attributed to inhomogeneities in the wind this would imply that luminous O and early-B stars have clumping factors in their H\$\alpha\$ and UV line forming regime of about a factor of 3--5. The investigated stars cover a metallicity range \$Z\$ from 0.2 to 1 \$Z_{\odot}\$. We find a hint towards smaller clumping factors for lower \$Z\$. The derived clumping factors, however, presuppose that clumping does not impact the predictions of the mass-loss rate. We discuss this assumption and explain how we intend to investigate its validity in more detail.}, language = {en} } @inproceedings{Blomme2007, author = {Blomme, R.}, title = {Corotating Interaction Regions and clumping}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-18100}, year = {2007}, abstract = {We present hydrodynamical models for Corotating Interaction Regions, which were used by Lobel (2007) to model the Discrete Absorption Components in HD 64760. We also discuss our failure to model the rotational modulations seen in the same star.}, language = {en} } @inproceedings{Karagjosova2006, author = {Karagjosova, Elena}, title = {Correction and acceptance by contrastive focus}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-10258}, year = {2006}, abstract = {An account is presented of the focus properties, common ground effect and dialogue behaviour of the accented German discourse marker "doch" and the accented sentence negation "nicht". It is argued that "doch" and "nicht" evoke as a focus alternative the logical complement of the proposition expressed by the sentence in which they occur, and that an analysis in terms of contrastive focus accounts for their effect on the common ground and their function in dialogue.}, language = {en} } @inproceedings{Diderichsen2006, author = {Diderichsen, Philip}, title = {Cross recurrence quantification analysis of indefinite anaphora in Swedish dialog : an eye-tracking pilot experiment}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-10388}, year = {2006}, abstract = {A new method is used in an eye-tracking pilot experiment which shows that it is possible to detect differences in common ground associated with the use of minimally different types of indefinite anaphora. Following Richardson and Dale (2005), cross recurrence quantification analysis (CRQA) was used to show that the tandem eye movements of two Swedish-speaking interlocutors are slightly more coupled when they are using fully anaphoric indefinite expressions than when they are using less anaphoric indefinites. This shows the potential of CRQA to detect even subtle processing differences in ongoing discourse.}, language = {en} } @inproceedings{RehakStreckerEchtler2006, author = {Rehak, Katrin and Strecker, Manfred and Echtler, Helmut Peter}, title = {DEM supported tectonic geomorphology : the Coastal Cordillera of the South-Central Chilean active margin ; [Poster]}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-7224}, year = {2006}, abstract = {Fluvial systems are one of the major features shaping a landscape. They adjust to the prevailing tectonic and climatic setting and therefore are very sensitive markers of changes in these systems. If their response to tectonic and climatic forcing is quantified and if the climatic signal is excluded, it is possible to derive a local deformation history. Here, we investigate fluvial terraces and erosional surfaces in the southern Chilean forearc to assess a long-term geomorphic and hence tectonic evolution. Remote sensing and field studies of the Nahuelbuta Range show that the long-term deformation of the Chilean forearc is manifested by breaks in topography, sequences of differentially uplifted marine, alluvial and strath terraces as well as tectonically modified river courses and drainage basins. We used SRTM-90-data as basic elevation information for extracting and delineating drainage networks. We calculated hypsometric curves as an indicator for basin uplift, stream-length gradient indices to identify stream segments with anomalous slopes, and longitudinal river profiles as well as DS-plots to identify knickpoints and other anomalies. In addition, we investigated topography with elevation-slope graphs, profiles, and DEMs to reveal erosional surfaces. During the first field trip we already measured palaeoflow directions, performed pebble counting and sampled the fluvial terraces in order to apply cosmogenic nuclide dating (10Be, 26Al) as well as provenance analyses. Our preliminary analysis of the Coastal Cordillera indicates a clear segmentation between the northern and southern parts of the Nahuelbuta Range. The Lanalhue Fault, a NW-SE striking fault zone oblique to the plate boundary, defines the segment boundary. Furthermore, we find a complex drainage re-organisation including a drainage reversal and wind gap on the divide between the Tir{\´u}a and Pellahu{\´e}n basins east of the town Tir{\´u}a. The coastal basins lost most of their Andean sediment supply areas that existed in Tertiary and in part during early Pleistocene time. Between the B{\´i}o-B{\´i}o and Imperial rivers no Andean river is recently capable to traverse the Coastal Cordillera, suggesting ongoing Quaternary uplift of the entire range. From the spatial distribution of geomorphic surfaces in this region two uplift signals may be derived: (1) a long-term differential uplift process, active since the Miocene and possibly caused by underplating of subducted trench sediments, (2) a younger, local uplift affecting only the northern part of the Nahuelbuta Range that may be caused by the interaction of the forearc with the subduction of the Mocha Fracture Zone at the latitude of the Arauco peninsula. Our approach thus provides results in our attempt to decipher the characteristics of forearc development of active convergent margins using long-term geomorphic indicators. Furthermore, it is expected that our ongoing assessment will constrain repeatedly active zones of deformation.
Interdisziplin{\"a}res Zentrum f{\"u}r Musterdynamik und Angewandte Fernerkundung Workshop vom 9. - 10. Februar 2006}, language = {en} } @inproceedings{BoegelButtHautlietal.2008, author = {B{\"o}gel, Tina and Butt, Miriam and Hautli, Annette and Sulger, Sebastian}, title = {Developing a finite-state morphological analyzer for Urdu and Hindi}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-27155}, year = {2008}, abstract = {We introduce and discuss a number of issues that arise in the process of building a finite-state morphological analyzer for Urdu, in particular issues with potential ambiguity and non-concatenative morphology. Our approach allows for an underlyingly similar treatment of both Urdu and Hindi via a cascade of finite-state transducers that transliterates the very different scripts into a common ASCII transcription system. As this transliteration system is based on the XFST tools that the Urdu/Hindi common morphological analyzer is also implemented in, no compatibility problems arise.}, language = {en} } @inproceedings{KempsonCann2006, author = {Kempson, Ruth and Cann, Ronnie}, title = {Dialogue pressures and syntactic change}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-10469}, year = {2006}, abstract = {On the basis of the Dynamic Syntax framework, this paper argues that the production pressures in dialogue determining alignment effects and given versus new informational effects also drive the shift from case-rich free word order systems without clitic pronouns into systems with clitic pronouns with rigid relative ordering. The paper introduces assumptions of Dynamic Syntax, in particular the building up of interpretation through structural underspecification and update, sketches the attendant account of production with close coordination of parsing and production strategies, and shows how what was at the Latin stage a purely pragmatic, production-driven decision about linear ordering becomes encoded in the clitics in theMedieval Spanish system which then through successive steps of routinization yield the modern systems with immediately pre-verbal fixed clitic templates.}, language = {en} } @inproceedings{Puls2007, author = {Puls, Joachim}, title = {Discussion : X-rays}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-18000}, year = {2007}, abstract = {Clumping in hot-star winds : proceedings of an international workshop held in Potsdam, Germany, 18. - 22. June 2007}, language = {en} } @inproceedings{StLouis2007, author = {St-Louis, N.}, title = {Discussion: Binaries, colliding winds, LBVs and high energy radiation}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-18155}, year = {2007}, abstract = {Clumping in hot-star winds : proceedings of an international workshop held in Potsdam, Germany, 18. - 22. June 2007}, language = {en} } @inproceedings{Vink2007, author = {Vink, J. S.}, title = {Discussion: Hydrodynamic modeling}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-18046}, year = {2007}, language = {en} } @inproceedings{Cassinelli2007, author = {Cassinelli, Joseph P.}, title = {Discussion: Magnetic fields, variability}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-18195}, year = {2007}, language = {en} } @inproceedings{Fullerton2007, author = {Fullerton, A. W.}, title = {Discussion: Spectral modeling}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17917}, year = {2007}, language = {en} } @inproceedings{Massa2007, author = {Massa, D. L.}, title = {Discussion: Spectroscopy and Mass-Loss Diagnostics}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17821}, year = {2007}, language = {en} } @inproceedings{StLouisMoffat2007, author = {St-Louis, N. and Moffat, Anthony F. J.}, title = {Do clumping corrections increase with decreasing mass-loss rates?}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17696}, year = {2007}, abstract = {We report on new mass-loss rate estimates for O stars in six massive binaries using the amplitude of orbital-phase dependent, linear-polarimetric variability caused by electron scattering off free electrons in the winds. Our estimated mass-loss rates for luminous O stars are independent of clumping. They suggest similar clumping corrections as for WR stars and do not support the recently proposed reduction in mass-loss rates of O stars by one or two orders of magnitude.}, language = {en} } @inproceedings{Owocki2007, author = {Owocki, S. P.}, title = {Dynamical simulation of the "velocity-porosity" reduction in observed strength of stellar wind lines}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17992}, year = {2007}, abstract = {I use dynamical simulations of the line-driven instability to examine the potential role of the resulting flow structure in reducing the observed strength of wind absorption lines. Instead of the porosity length formalism used to model effects on continuum absorption, I suggest reductions in line strength can be better characterized in terms of a velocity clumping factor that is insensitive to spatial scales. Examples of dynamic spectra computed directly from instability simulations do exhibit a net reduction in absorption, but only at a modest 10-20\% level that is well short of the ca. factor 10 required by recent analyses of PV lines.}, language = {en} } @inproceedings{Gull2007, author = {Gull, T. R.}, title = {Eta Carinae viewed from different vantages}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-18200}, year = {2007}, abstract = {The spatially-resolved winds of the massive binary, Eta Carinae, extend an arcsecond on the sky, well beyond the 10 to 20 milliarcsecond binary orbital dimension. Stellar wind line profiles, observed at very different angular resolutions of VLTI/AMBER, HST/STIS and VLT/UVES, provide spatial information on the extended wind interaction structure as it changes with orbital phase. These same wind lines, observable in the starlight scattered off the foreground lobe of the dusty Homunculus, provide time-variant line profiles viewed from significantly different angles. Comparisons of direct and scattered wind profiles observed in the same epoch and at different orbital phases provide insight on the extended wind structure and promise the potential for three-dimensional imaging of the outer wind structures. Massive, long-lasting clumps, including the nebularWeigelt blobs, originated during the two historical ejection events. Wind interactions with these clumps are quite noticeable in spatially-resolved spectroscopy. As the 2009.0 minimum approaches, analysis of existing spectra and 3-D modeling are providing bases for key observations to gain further understanding of this complex massive binary.}, language = {en} } @inproceedings{Cabalar2010, author = {Cabalar, Pedro}, title = {Existential quantifiers in the rule body}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-41476}, year = {2010}, abstract = {In this paper we consider a simple syntactic extension of Answer Set Programming (ASP) for dealing with (nested) existential quantifiers and double negation in the rule bodies, in a close way to the recent proposal RASPL-1. The semantics for this extension just resorts to Equilibrium Logic (or, equivalently, to the General Theory of Stable Models), which provides a logic-programming interpretation for any arbitrary theory in the syntax of Predicate Calculus. We present a translation of this syntactic class into standard logic programs with variables (either disjunctive or normal, depending on the input rule heads), as those allowed by current ASP solvers. The translation relies on the introduction of auxiliary predicates and the main result shows that it preserves strong equivalence modulo the original signature.}, language = {en} } @inproceedings{Piskorski2008, author = {Piskorski, Jakub}, title = {ExPRESS : extraction pattern recognition engine and specification suite}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-27227}, year = {2008}, abstract = {The emergence of information extraction (IE) oriented pattern engines has been observed during the last decade. Most of them exploit heavily finite-state devices. This paper introduces ExPRESS - a new extraction pattern engine, whose rules are regular expressions over flat feature structures. The underlying pattern language is a blend of two previously introduced IE oriented pattern formalisms, namely, JAPE, used in the widely known GATE system, and the unificationbased XTDL formalism used in SProUT. A brief and technical overview of ExPRESS, its pattern language and the pool of its native linguistic components is given. Furthermore, the implementation of the grammar interpreter is addressed too.}, language = {en} } @inproceedings{IpingSonnebornMassaetal.2007, author = {Iping, R.C. and Sonneborn, G. and Massa, D.L. and Gies, D. and Williams, Simon E.}, title = {Far-ultraviolet spectroscopy of O+O binaries in the Magellanic Clouds}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17896}, year = {2007}, abstract = {We report FUSE observations in 2005-2006 of three O-type, double-lined spectroscopic binaries in the Magellanic Clouds. The systems have very short periods (1.4-2.25 d), represent rare, young evolutionary stages of massive stars and binaries, and provide a unique glimpse at some of the most massive systems that form in dense clusters of massive stars. Improved orbit parameters, including revised masses, for LH54-425 are derived from new ctio spectroscopy. The systems are: LH54-425 in the LMC (O3V + O5V, P=2.25d, 62+37M⊙), J053441-693139 in the LMC (O2-3If+O6V, P=1.4 d, 41+27M⊙), and Hodge 53-47 in the SMC (O6V + O4-5IIIf, P=2.2 d, 24+14M⊙, where the O4 star appears to be less massive than the O6 star). Their short periods indicates that wind interaction and mass transfer are likely important factors in their evolution. The spectra provide quantitative and systematic studies of phase-dependent stellar wind properties, wind collision effects in O+O binaries at lower metallicities, improved radial velocity curves, and FUV spectro-photometric changes as a function of orbital phase.}, language = {en} } @inproceedings{Barthelemy2008, author = {Barth{\´e}lemy, Fran{\c{c}}ois}, title = {Finite-state compilation of feature structures for two-level morphology}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-27120}, year = {2008}, abstract = {This paper describes a two-level formalism where feature structures are used in contextual rules. Whereas usual two-level grammars describe rational sets over symbol pairs, this new formalism uses tree structured regular expressions. They allow an explicit and precise definition of the scope of feature structures. A given surface form may be described using several feature structures. Feature unification is expressed in contextual rules using variables, like in a unification grammar. Grammars are compiled in finite state multi-tape transducers.}, language = {en} } @inproceedings{ZarriessSeeker2008, author = {Zarrieß, Sina and Seeker, Wolfgang}, title = {Finite-state rule deduction for parsing non-constituent coordination}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-27254}, year = {2008}, abstract = {In this paper, we present a finite-state approach to constituency and therewith an analysis of coordination phenomena involving so-called non-constituents. We show that non-constituents can be seen as parts of fully-fledged constituents and therefore be coordinated in the same way. We have implemented an algorithm based on finite state automata that generates an LFG grammar assigning valid analyses to non-constituent coordination structures in the German language.}, language = {en} } @inproceedings{LascaridesStone2006, author = {Lascarides, Alex and Stone, Matthew}, title = {Formal semantics for iconic gesture}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-10330}, year = {2006}, abstract = {We present a formal analysis of iconic coverbal gesture. Our model describes the incomplete meaning of gesture that's derivable from its form, and the pragmatic reasoning that yields a more specific interpretation. Our formalism builds on established models of discourse interpretation to capture key insights from the descriptive literature on gesture: synchronous speech and gesture express a single thought, but while the form of iconic gesture is an important clue to its interpretation, the content of gesture can be resolved only by linking it to its context.}, language = {en} } @inproceedings{BeyssadeMarandin2006, author = {Beyssade, Claire and Marandin, Jean-Marie}, title = {From complex to simple speech acts : a bidimensional analysis of illocutionary}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-10319}, year = {2006}, abstract = {We present a new analysis of illocutionary forces in dialogue. We analyze them as complex conversational moves involving two dimensions: what Speaker commits herself to and what she calls on Addressee to perform. We start from the analysis of speech acts such as confirmation requests or whimperatives, and extend the analysis to seemingly simple speech acts, such as statements and queries. Then, we show how to integrate our proposal in the framework of the Grammar for Conversation (Ginzburg, to app.), which is adequate for modelling agents' information states and how they get updated.}, language = {en} } @inproceedings{PoppBlaumDomptailetal.2006, author = {Popp, Alexander and Blaum, Niels and Domptail, Stephanie and Herpel, Nicole and Gr{\"o}ngr{\"o}ft, Alexander and Hoffman, T. T. and J{\"u}rgens, Norbert and Milton, Sue and Nuppenau, Ernst-August and Rossmanith, Eva and Schmidt, Michael and Vogel, Melanie and Vohland, Katrin and Jeltsch, Florian}, title = {From satellite imagery to soil-plant interactions}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-7302}, year = {2006}, abstract = {Decisions for the conservation of biodiversity and sustainable management of natural resources are typically related to large scales, i.e. the landscape level. However, understanding and predicting the effects of land use and climate change on scales relevant for decision-making requires to include both, large scale vegetation dynamics and small scale processes, such as soil-plant interactions. Integrating the results of multiple BIOTA subprojects enabled us to include necessary data of soil science, botany, socio-economics and remote sensing into a high resolution, process-based and spatially-explicit model. Using an example from a sustainably-used research farm and a communally used and degraded farming area in semiarid southern Namibia we show the power of simulation models as a tool to integrate processes across disciplines and scales.}, language = {en} } @inproceedings{MoffatHillierHamannetal.2007, author = {Moffat, Anthony F. J. and Hillier, D. J. and Hamann, Wolf-Rainer and Owocki, S. P.}, title = {General Discussion}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17953}, year = {2007}, abstract = {Clumping in hot-star winds : proceedings of an international workshop held in Potsdam, Germany, 18. - 22. June 2007}, language = {en} } @inproceedings{MaerkerSchroederEsselbachCapolongoetal.2006, author = {M{\"a}rker, Michael and Schr{\"o}der-Esselbach, Boris and Capolongo, Domenico and Bentivenga, Mario}, title = {Geomorphological and pedological processes in badland areas of Southern Italy and their interaction with Mediterranean vegetation}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-7288}, year = {2006}, abstract = {Interdisziplin{\"a}res Zentrum f{\"u}r Musterdynamik und Angewandte Fernerkundung Workshop vom 9. - 10. Februar 2006}, language = {en} } @inproceedings{SagetGuyomard2006, author = {Saget, Sylvie and Guyomard, Marc}, title = {Goal-oriented dialog as a collaborative subordinated activity involving collective acceptance}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-10420}, year = {2006}, abstract = {Modeling dialog as a collaborative activity consists notably in specifying the contain of the Conversational Common Ground and the kind of social mental state involved. In previous work (Saget, 2006), we claim that Collective Acceptance is the proper social attitude for modeling Conversational Common Ground in the particular case of goal-oriented dialog. We provide a formalization of Collective Acceptance, besides elements in order to integrate this attitude in a rational model of dialog are provided; and finally, a model of referential acts as being part of a collaborative activity is provided. The particular case of reference has been chosen in order to exemplify our claims.}, language = {en} } @inproceedings{Runacres2007, author = {Runacres, M. C.}, title = {Hydrodynamical models of clumping beyond 50 R∗}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-18030}, year = {2007}, abstract = {We present one-dimensional, time-dependent models of the clumps generated by the linedeshadowing instability. In order to follow the clumps out to distances of more than 1000 R∗, we use an efficient moving-box technique. We show that, within the approximations, the wind can remain clumped well into the formation region of the radio continuum.}, language = {en} } @inproceedings{MorrisonRotherKurschat2007, author = {Morrison, N. D. and Rother, R. and Kurschat, N.}, title = {Hα line profile variability in the B8Ia-type supergiant Rigel (β Ori)}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-18120}, year = {2007}, abstract = {Hα observations of Rigel obtained on 184 nights during the past ten years with the 1-m telescope and ´echelle spectrograph of Ritter Observatory are surveyed. The line profiles were classified in terms of morphology. About 1/4 of them are of P Cygni type, about 15\% inverse P Cygni, about 25\% double-peaked, about 1/3 pure absorption, and a few are single emission lines. Transformation of the profile from one type to another typically takes a few days. Although the line stays in absorption for extended intervals, only one high-velocity absorption event of the intensity reported by Kaufer et al. (1996a) was observed, in late 2006. Late in this event, Hα absorption occurred farther to the red than the red wing of a plausible photospheric absorption component, an indication of infalling material. In general, as the absorption events come to an end, the emission typically returns with an inverse P Cygni profile. The Hα profile class shows no obvious correlation with the radial velocity of C II λ6578, a photospheric absorption line.}, language = {en} } @inproceedings{ArtsteinPoesio2006, author = {Artstein, Ron and Poesio, Massimo}, title = {Identifying reference to abstract objects in dialogue}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-10357}, year = {2006}, abstract = {In two experiments, many annotators marked antecedents for discourse deixis as unconstrained regions of text. The experiments show that annotators do converge on the identity of these text regions, though much of what they do can be captured by a simple model. Demonstrative pronouns are more likely than definite descriptions to be marked with discourse antecedents. We suggest that our methodology is suitable for the systematic study of discourse deixis.}, language = {en} } @inproceedings{Sonneborn2007, author = {Sonneborn, G.}, title = {Imaging and spectroscopy with the James Webb Space Telescope}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17983}, year = {2007}, abstract = {The James Webb Space Telescope (JWST) is a large, infrared-optimized space telescope scheduled for launch in 2013. JWST will find the first stars and galaxies that formed in the early universe, connecting the Big Bang to our own Milky Way galaxy. JWST will peer through dusty clouds to see stars forming planetary systems, connecting the MilkyWay to our own Solar System. JWST's instruments are designed to work primarily in the infrared range of 1 - 28 μm, with some capability in the visible range. JWST will have a large mirror, 6.5 m in diameter, and will be diffraction-limited at 2 μm (0.1 arcsec resolution). JWST will be placed in an L2 orbit about 1.5 million km from the Earth. The instruments will provide imaging, coronography, and multi-object and integral-field spectroscopy across the 1 - 28 μm wavelength range. The breakthrough capabilities of JWST will enable new studies of massive star winds from the Milky Way to the early universe.}, language = {en} } @inproceedings{Smith2007, author = {Smith, Nathan}, title = {Independent signs of lower mass-loss rates for O-type stars}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17659}, year = {2007}, abstract = {I discuss observational evidence - independent of the direct spectral diagnostics of stellar winds themselves - suggesting that mass-loss rates for O stars need to be revised downward by roughly a factor of three or more, in line with recent observed mass-loss rates for clumped winds. These independent constraints include the large observed mass-loss rates in LBV eruptions, the large masses of evolved massive stars like LBVs and WNH stars, WR stars in lower metallicity environments, observed rotation rates of massive stars at different metallicity, supernovae that seem to defy expectations of high mass-loss rates in stellar evolution, and other clues. I pay particular attention to the role of feedback that would result from higher mass-loss rates, driving the star to the Eddington limit too soon, and therefore making higher rates appear highly implausible. Some of these arguments by themselves may have more than one interpretation, but together they paint a consistent picture that steady line-driven winds of O-type stars have lower mass-loss rates and are significantly clumped.}, language = {en} } @inproceedings{HofukuChoNishidaetal.2013, author = {Hofuku, Yayoi and Cho, Shinya and Nishida, Tomohiro and Kanemune, Susumu and Linck, Barbara and Kim, Seungyon and Park, Seongbin and Van{\´i}ček, Jiř{\´i} and Gujberov{\´a}, Monika and Tomcs{\´a}nyi, Peter and Dagiene, Valentina and Jevsikova, Tatjana and Schulte, Carsten and Sentance, Sue and Thota, Neena and G{\"u}lbahar, Yasemin and İlkhan, Mustafa and Kilis, Selcan and Arslan, Okan and Nakano, Yoshiaki and Izutsu, Katsunobu and Lessner, Daniel and Reffay, Christophe and Miled, Mahdi and Ortiz, Pascal and F{\´e}vrier, Lo{\"i}c and Grgurina, Nataša and Weise, Martin and Bellettini, Carlo and Lonati, Violetta and Malchiodi, Dario and Monga, Mattia and Morpurgo, Anna and Torelli, Mauro and Planteu, Lukas and Standl, Bernhard and Grossmann, Wilfried and Neuwirth, Erich and Benacka, Jan and Ragonis, Noa and Hodges, Steve and Berry, Carol and Kusterer, Peter}, title = {Informatics in schools : local proceedings of the 6th International Conference ISSEP 2013 ; selected papers ; Oldenburg, Germany, February 26-March 2, 2013}, editor = {Diethelm, Ira and Arndt, Jannik and D{\"u}nnebier, Malte and Syrbe, J{\"o}rn}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-222-3}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-63688}, pages = {162}, year = {2013}, abstract = {The International Conference on Informatics in Schools: Situation, Evolution and Perspectives - ISSEP - is a forum for researchers and practitioners in the area of Informatics education, both in primary and secondary schools. It provides an opportunity for educators to reflect upon the goals and objectives of this subject, its curricula and various teaching/learning paradigms and topics, possible connections to everyday life and various ways of establishing Informatics Education in schools. This conference also cares about teaching/learning materials, various forms of assessment, traditional and innovative educational research designs, Informatics' contribution to the preparation of children for the 21st century, motivating competitions, projects and activities supporting informatics education in school.}, language = {en} } @inproceedings{ZeilingerMuttiStreckeretal.2006, author = {Zeilinger, Gerold and Mutti, Maria and Strecker, Manfred and Rehak, Katrin and Bookhagen, Bodo and Schwab, Marco}, title = {Integration of digital elevation models and satellite images to investigate geological processes.}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-7063}, year = {2006}, abstract = {In order to better understand the geological boundary conditions for ongoing or past surface processes geologists face two important questions: 1) How can we gain additional knowledge about geological processes by analyzing digital elevation models (DEM) and satellite images and 2) Do these efforts present a viable approach for more efficient research. Here, we will present case studies at a variety of scales and levels of resolution to illustrate how we can substantially complement and enhance classical geological approaches with remote sensing techniques. Commonly, satellite and DEM based studies are being used in a first step of assessing areas of geologic interest. While in the past the analysis of satellite imagery (e.g. Landsat TM) and aerial photographs was carried out to characterize the regional geologic characteristics, particularly structure and lithology, geologists have increasingly ventured into a process-oriented approach. This entails assessing structures and geomorphic features with a concept that includes active tectonics or tectonic activity on time scales relevant to humans. In addition, these efforts involve analyzing and quantifying the processes acting at the surface by integrating different remote sensing and topographic data (e.g. SRTM-DEM, SSM/I, GPS, Landsat 7 ETM, Aster, Ikonos…). A combined structural and geomorphic study in the hyperarid Atacama desert demonstrates the use of satellite and digital elevation data for assessing geological structures formed by long-term (millions of years) feedback mechanisms between erosion and crustal bending (Zeilinger et al., 2005). The medium-term change of landscapes during hundred thousands to millions years in a more humid setting is shown in an example from southern Chile. Based on an analysis of rivers/watersheds combined with landscapes parameterization by using digital elevation models, the geomorphic evolution and change in drainage pattern in the coastal Cordillera can be quantified and put into the context of seismotectonic segmentation of a tectonically active region. This has far-reaching implications for earthquake rupture scenarios and hazard mitigation (K. Rehak, see poster on IMAF Workshop). Two examples illustrate short-term processes on decadal, centennial and millennial time scales: One study uses orogen scale precipitation gradients derived from remotely sensed passive microwave data (Bookhagen et al., 2005a). They demonstrate how debris flows were triggered as a response of slopes to abnormally strong rainfall in the interior parts of the Himalaya during intensified monsoons. The area of the orogen that receives high amounts of precipitation during intensified monsoons also constitutes numerous landslide deposits of up to 1km3 volume that were generated during intensified monsoon phase at about 27 and 9 ka (Bookhagen et al., 2005b). Another project in the Swiss Alps compared sets of aerial photographs recorded in different years. By calculating high resolution surfaces the mass transport in a landslide could be reconstructed (M. Schwab, Universit{\"a}t Bern). All these examples, although representing only a short and limited selection of projects using remote sense data in geology, have as a common approach the goal to quantify geological processes. With increasing data resolution and new sensors future projects will even enable us to recognize more patterns and / or structures indicative of geological processes in tectonically active areas. This is crucial for the analysis of natural hazards like earthquakes, tsunamis and landslides, as well as those hazards that are related to climatic variability. The integration of remotely sensed data at different spatial and temporal scales with field observations becomes increasingly important. Many of presently highly populated places and increasingly utilized regions are subject to significant environmental pressure and often constitute areas of concentrated economic value. Combined remote sensing and ground-truthing in these regions is particularly important as geologic, seismicity and hydrologic data may be limited here due to the recency of infrastructural development. Monitoring ongoing processes and evaluating the remotely sensed data in terms of recurrence of events will greatly enhance our ability to assess and mitigate natural hazards.
Dokument 1: Foliensatz | Dokument 2: Abstract
Interdisziplin{\"a}res Zentrum f{\"u}r Musterdynamik und Angewandte Fernerkundung Workshop vom 9. - 10. Februar 2006}, language = {en} } @inproceedings{BonfanteLeRoux2008, author = {Bonfante, Guillaume and Le Roux, Joseph}, title = {Intersection optimization is NP-complete}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-27146}, year = {2008}, abstract = {Finite state methods for natural language processing often require the construction and the intersection of several automata. In this paper, we investigate the question of determining the best order in which these intersections should be performed. We take as an example lexical disambiguation in polarity grammars. We show that there is no efficient way to minimize the state complexity of these intersections.}, language = {en} } @inproceedings{OetschSchwengererTompits2010, author = {Oetsch, Johannes and Schwengerer, Martin and Tompits, Hans}, title = {Kato: a plagiarism-detection tool for answer-set programs}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-41485}, year = {2010}, abstract = {We present the tool Kato which is, to the best of our knowledge, the first tool for plagiarism detection that is directly tailored for answer-set programming (ASP). Kato aims at finding similarities between (segments of) logic programs to help detecting cases of plagiarism. Currently, the tool is realised for DLV programs but it is designed to handle various logic-programming syntax versions. We review basic features and the underlying methodology of the tool.}, language = {en} } @inproceedings{CurzonKalasSchubertetal.2015, author = {Curzon, Paul and Kalas, Ivan and Schubert, Sigrid and Schaper, Niclas and Barnes, Jan and Kennewell, Steve and Br{\"o}ker, Kathrin and Kastens, Uwe and Magenheim, Johannes and Dagiene, Valentina and Stupuriene, Gabriele and Ellis, Jason Brent and Abreu-Ellis, Carla Reis and Grillenberger, Andreas and Romeike, Ralf and Haugsbakken, Halvdan and Jones, Anthony and Lewin, Cathy and McNicol, Sarah and Nelles, Wolfgang and Neugebauer, Jonas and Ohrndorf, Laura and Schaper, Niclas and Schubert, Sigrid and Opel, Simone and Kramer, Matthias and Trommen, Michael and Pottb{\"a}cker, Florian and Ilaghef, Youssef and Passig, David and Tzuriel, David and Kedmi, Ganit Eshel and Saito, Toshinori and Webb, Mary and Weigend, Michael and Bottino, Rosa and Chioccariello, Augusto and Christensen, Rhonda and Knezek, Gerald and Gioko, Anthony Maina and Angondi, Enos Kiforo and Waga, Rosemary and Ohrndorf, Laura and Or-Bach, Rachel and Preston, Christina and Younie, Sarah and Przybylla, Mareen and Romeike, Ralf and Reynolds, Nicholas and Swainston, Andrew and Bendrups, Faye and Sysło, Maciej M. and Kwiatkowska, Anna Beata and Zieris, Holger and Gerstberger, Herbert and M{\"u}ller, Wolfgang and B{\"u}chner, Steffen and Opel, Simone and Schiller, Thomas and Wegner, Christian and Zender, Raphael and Lucke, Ulrike and Diethelm, Ira and Syrbe, J{\"o}rn and Lai, Kwok-Wing and Davis, Niki and Eickelmann, Birgit and Erstad, Ola and Fisser, Petra and Gibson, David and Khaddage, Ferial and Knezek, Gerald and Micheuz, Peter and Kloos, Carlos Delgado}, title = {KEYCIT 2014}, editor = {Brinda, Torsten and Reynolds, Nicholas and Romeike, Ralf and Schwill, Andreas}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-292-6}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-70325}, pages = {438}, year = {2015}, abstract = {In our rapidly changing world it is increasingly important not only to be an expert in a chosen field of study but also to be able to respond to developments, master new approaches to solving problems, and fulfil changing requirements in the modern world and in the job market. In response to these needs key competencies in understanding, developing and using new digital technologies are being brought into focus in school and university programmes. The IFIP TC3 conference "KEYCIT - Key Competences in Informatics and ICT (KEYCIT 2014)" was held at the University of Potsdam in Germany from July 1st to 4th, 2014 and addressed the combination of key competencies, Informatics and ICT in detail. The conference was organized into strands focusing on secondary education, university education and teacher education (organized by IFIP WGs 3.1 and 3.3) and provided a forum to present and to discuss research, case studies, positions, and national perspectives in this field.}, language = {en} } @inproceedings{udDoula2007, author = {ud-Doula, A.}, title = {Large-scale wind structure due to magnetic fields}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-18010}, year = {2007}, abstract = {Magnetic fields influence the dynamics of hot-star winds and create large scale structure. Based on numerical magnetohydrodynamic (MHD) simulations, we model the wind of θ¹ Ori C, and then use the SEI method to compute synthetic line profiles for a range of viewing angles as function of rotational phase. The resulting dynamic spectrum for a moderately strong line shows a distinct modulation, but with a phase that seems at odds with available observations.}, language = {en} } @inproceedings{SchnerrHenrichs2007, author = {Schnerr, R. S. and Henrichs, H. F.}, title = {Magnetic fields and wind variability in massive stars}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-18075}, year = {2007}, abstract = {This paper describes the thesis work of Schnerr (2007) entitled "Magnetic fields and mass loss in massive stars", which aimed at a better understanding of the impact of magnetic fields on the winds of massive stars.}, language = {en} } @inproceedings{GrohHillierDamineli2007, author = {Groh, J. H. and Hillier, D. J. and Damineli, A.}, title = {Mass-loss rate and clumping in LBV stars : the impact of time-dependent effects}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17773}, year = {2007}, abstract = {This paper outlines a newly-developed method to include the effects of time variability in the radiative transfer code CMFGEN. It is shown that the flow timescale is often large compared to the variability timescale of LBVs. Thus, time-dependent effects significantly change the velocity law and density structure of the wind, affecting the derivation of the mass-loss rate, volume filling factor, wind terminal velocity, and luminosity. The results of this work are directly applicable to all active LBVs in the Galaxy and in the LMC, such as AG Car, HR Car, S Dor and R 127, and could result in a revision of stellar and wind parameters. The massloss rate evolution of AG Car during the last 20 years is presented, highlighting the need for time-dependent models to correctly interpret the evolution of LBVs.}, language = {en} } @inproceedings{PadroPadro2008, author = {Padr{\´o}, Muntsa and Padr{\´o}, Llu{\´i}s}, title = {ME-CSSR : an extension of CSSR using maximum entropy models}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-27210}, year = {2008}, abstract = {In this work an extension of CSSR algorithm using Maximum Entropy Models is introduced. Preliminary experiments to perform Named Entity Recognition with this new system are presented.}, language = {en} } @inproceedings{KranstedtLueckingPfeifferetal.2006, author = {Kranstedt, Alfred and L{\"u}cking, Andy and Pfeiffer, Thies and Rieser, Hannes and Staudacher, Marc}, title = {Measuring and reconstructing pointing in visual contexts}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-10362}, year = {2006}, abstract = {We describe an experiment to gather original data on geometrical aspects of pointing. In particular, we are focusing upon the concept of the pointing cone, a geometrical model of a pointing's extension. In our setting we employed methodological and technical procedures of a new type to integrate data from annotations as well as from tracker recordings. We combined exact information on position and orientation with rater's classifications. Our first results seem to challenge classical linguistic and philosophical theories of demonstration in that they advise to separate pointings from reference.}, language = {en} } @inproceedings{KuhnertGuentnerKlannetal.2006, author = {Kuhnert, Matthias and G{\"u}ntner, Andreas and Klann, Mechthild and Martin Garrido, F. and Zillgens, Birgit}, title = {Methods for spatial pattern comparison in distributed hydrological modelling : [Poster]}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-7160}, year = {2006}, abstract = {The rigorous development, application and validation of distributed hydrological models obligates to evaluate data in a spatially distributed way. In particular, spatial model predictions such as the distribution of soil moisture, runoff generating areas or nutrient-contributing areas or erosion rates, are to be assessed against spatially distributed observations. Also model inputs, such as the distribution of modelling units derived by GIS and remote sensing analyses, should be evaluated against groundbased observations of landscape characteristics. So far, however, quantitative methods of spatial field comparison have rarely been used in hydrology. In this paper, we present algorithms that allow to compare observed and simulated spatial hydrological data. The methods can be applied for binary and categorical data on regular grids. They comprise cell-by-cell algorithms, cell-neighbourhood approaches that account for fuzziness of location, and multi-scale algorithms that evaluate the similarity of spatial fields with changing resolution. All methods provide a quantitative measure of the similarity of two maps. The comparison methods are applied in two mountainous catchments in southern Germany (Brugga, 40 km2) and Austria (L{\"o}hnersbach, 16 km2). As an example of binary hydrological data, the distribution of saturated areas is analyzed in both catchments. For categorical data, vegetation zones that are associated with different runoff generation mechanisms are analyzed in the L{\"o}hnersbach. Mapped spatial patterns are compared to simulated patterns from terrain index calculations and from satellite image analysis. It is discussed how particular features of visual similarity between the spatial fields are captured by the quantitative measures, leading to recommendations on suitable algorithms in the context of evaluating distributed hydrological models.}, language = {en} } @inproceedings{SchnurrCrowther2007, author = {Schnurr, O. and Crowther, P. A.}, title = {Mid-IR observations of WC stars, and the connection to wind clumping}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17884}, year = {2007}, abstract = {We present preliminary results of a tailored atmosphere analysis of six Galactic WC stars using UV, optical, and mid-infrared Spitzer IRS data. With these data, we are able to sample regions from 10 to 10³ stellar radii, thus to determine wind clumping in different parts of the wind. Ultimately, derived wind parameters will be used to accuratelymeasure neon abundances, and to so test predicted nuclear-reaction rates.}, language = {en} } @inproceedings{WolskaKruijffKorbayova2006, author = {Wolska, Magdalena and Kruijff-Korbayov{\´a}, Ivana}, title = {Modeling anaphora in informal mathematical dialogue}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-10455}, year = {2006}, abstract = {We analyze anaphoric phenomena in the context of building an input understanding component for a conversational system for tutoring mathematics. In this paper, we report the results of data analysis of two sets of corpora of dialogs on mathematical theorem proving. We exemplify anaphoric phenomena, identify factors relevant to anaphora resolution in our domain and extensions to the input interpretation component to support it.}, language = {en} } @inproceedings{Lobel2007, author = {Lobel, A.}, title = {Modeling DACs in UV lines of massive hot stars}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17856}, year = {2007}, abstract = {We apply the 3-dimensional radiative transport codeWind3D to 3D hydrodynamic models of Corotating Interaction Regions to fit the detailed variability of Discrete Absorption Components observed in Si iv UV resonance lines of HD 64760 (B0.5 Ib). We discuss important effects of the hydrodynamic input parameters on these large-scale equatorial wind structures that determine the detailed morphology of the DACs computed with 3D transfer. The best fit model reveals that the CIR in HD 64760 is produced by a source at the base of the wind that lags behind the stellar surface rotation. The non-corotating coherent wind structure is an extended density wave produced by a local increase of only 0.6\% in the smooth symmetric wind mass-loss rate.}, language = {en} } @inproceedings{Thomas2006, author = {Thomas, Kavita E.}, title = {Modelling Correction Signalled by "But" in Dialogue}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-10308}, year = {2006}, abstract = {Claiming that cross-speaker "but" can signal correction in dialogue, we start by describing the types of corrections "but" can communicate by focusing on the Speech Act (SA) communicated in the previous turn and address the ways in which "but" can correct what is communicated. We address whether "but" corrects the proposition, the direct SA or the discourse relation communicated in the previous turn. We will also briefly address other relations signalled by cross-turn "but". After presenting a typology of the situations "but" can correct, we will address how these corrections can be modelled in the Information State model of dialogue, motivating this work by showing how it can be used to potentially avoid misunderstandings. We wrap up by showing how the model presented here updates beliefs in the Information State representation of the dialogue and can be used to facilitate response deliberation.}, language = {en} } @inproceedings{Kholtygin2007, author = {Kholtygin, A. F.}, title = {Modelling the induced clumping stochastic line profile variability}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-18180}, year = {2007}, abstract = {We model the line profile variability (lpv) in spectra of clumped stellar atmospheres using the Stochastic Clump Model (SCM) of the winds of early-type stars. In this model the formation of dense inhomogeneities (clumps) in the line driven winds is considered as being a stochastic process. It is supposed that the emission due to clumps mainly contributes to the intensities of emission lines in the stellar spectra. It is shown that in the framework of the SCM it is possible to reproduce both the mean line profiles and a common pattern of the lpv.}, language = {en} } @inproceedings{DaviesVinkOudmaijer2007, author = {Davies, B. and Vink, J. S. and Oudmaijer, R. D.}, title = {Modelling the polarimetric variability of hot stars}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17939}, year = {2007}, abstract = {Many hot stars exhibit stochastic polarimetric variability, thought to arise from clumping low in the wind. Here we investigate the wind properties required to reproduce this variability using analytic models, with particular emphasis on Luminous Blue Variables. We find that the winds must be highly structured, consisting of a large number of optically-thin clumps; while we find that the overall level of polarization should scale with mass-loss rate - consistent with observations of LBVs. The models also predict variability on very short timescales, which is supported by the results of a recent polarimetric monitoring campaign.}, language = {en} } @inproceedings{KubatSaad2007, author = {Kub{\´a}t, Jiř{\´i} and Saad, S. M.}, title = {Moving absorption bumps in the spectra of Be stars}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17879}, year = {2007}, abstract = {Several Be binaries exhibit an absorption bump moving across the blue wing of hydrogen emission lines towards the line center. This bump is demonstrated for the case of two bright Be stars, κ Dra and 4 Her. It is not clear what is the reason for this travelling bump.}, language = {en} } @inproceedings{LueckingRieserStaudacher2006, author = {L{\"u}cking, Andy and Rieser, Hannes and Staudacher, Marc}, title = {Multi-modal integration for gesture and speech}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-10393}, year = {2006}, abstract = {Demonstratives, in particular gestures that "only" accompany speech, are not a big issue in current theories of grammar. If we deal with gestures, fixing their function is one big problem, the other one is how to integrate the representations originating from different channels and, ultimately, how to determine their composite meanings. The growing interest in multi-modal settings, computer simulations, human-machine interfaces and VRapplications increases the need for theories ofmultimodal structures and events. In our workshopcontribution we focus on the integration of multimodal contents and investigate different approaches dealing with this problem such as Johnston et al. (1997) and Johnston (1998), Johnston and Bangalore (2000), Chierchia (1995), Asher (2005), and Rieser (2005).}, language = {en} } @inproceedings{VotrubaFeldmeierKubatetal.2007, author = {Votruba, V. and Feldmeier, Achim and Kub{\´a}t, Jiř{\´i} and R{\"a}tzel, D.}, title = {Multicomponent stellar wind of hot stars}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17677}, year = {2007}, abstract = {We developed a time-dependent multicomponent hydrodynamical code for simulation of the stellar wind from hot stars and applied it to stars with high and low density winds.}, language = {en} } @inproceedings{Karttunen2008, author = {Karttunen, Lauri}, title = {New features in PARC finite state toolkits (Abstract)}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-27085}, year = {2008}, language = {en} } @inproceedings{Moffat2007, author = {Moffat, Anthony F. J.}, title = {Observational overview of clumping in hot stellar winds}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17633}, year = {2007}, abstract = {In the old days (pre ∼1990) hot stellar winds were assumed to be smooth, which made life fairly easy and bothered no one. Then after suspicious behaviour had been revealed, e.g. stochastic temporal variability in broadband polarimetry of single hot stars, it took the emerging CCD technology developed in the preceding decades (∼1970-80's) to reveal that these winds were far from smooth. It was mainly high-S/N, time-dependent spectroscopy of strong optical recombination emission lines in WR, and also a few OB and other stars with strong hot winds, that indicated all hot stellar winds likely to be pervaded by thousands of multiscale (compressible supersonic turbulent?) structures, whose driver is probably some kind of radiative instability. Quantitative estimates of clumping-independent mass-loss rates came from various fronts, mainly dependent directly on density (e.g. electron-scattering wings of emission lines, UV spectroscopy of weak resonance lines, and binary-star properties including orbital-period changes, electron-scattering, and X-ray fluxes from colliding winds) rather than the more common, easier-to-obtain but clumping-dependent density-squared diagnostics (e.g. free-free emission in the IR/radio and recombination lines, of which the favourite has always been Hα). Many big questions still remain, such as: What do the clumps really look like? Do clumping properties change as one recedes from the mother star? Is clumping universal? Does the relative clumping correction depend on \$\dot{M}\$ itself?}, language = {en} } @inproceedings{Nielsen2007, author = {Nielsen, K. E.}, title = {On irregular line profiles in the optical spectrum of Eta Carinae}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-18227}, year = {2007}, abstract = {The optical spectrum of Eta Carinae (η Car) is prominent in H I, He i and Fe ii wind lines, all of which vary both in absorption and emission with phase. The phase dependance is a consequence of the interaction between the two objects in the η Car binary (η Car A \& B). The binary system is enshrouded by ejecta from previous mass ejection events and consequently, η Car B is not directly observable. We have traced the He i lines over η Car's spectroscopic period, using HST/STIS data obtained with medium spectral, but high angular, resolving power, and created a radial velocity curve for the system. The He I lines are formed in the core of the system, and appear to be a composite of multiple features formed in spatially separated regions. The sources of their irregular line profiles are still not fully understood, but can be attributed to emission/absorption near the wind-wind interface and/or a direct consequence of the η Car A's, massive, clumpy wind. This paper will discuss the spectral variability, the narrow emission structure of the He i lines and how clumpiness of the winds may impede the construction of the reliable radial velocity curve, necessary for characterizations of especially η Car B.}, language = {en} } @inproceedings{Saleschus2008, author = {Sal{\´e}schus, Dirk}, title = {On resolving long distance dependencies in Russian verbs}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-27235}, year = {2008}, abstract = {Morphological analyses based on word syntax approaches can encounter difficulties with long distance dependencies. The reason is that in some cases an affix has to have access to the inner structure of the form with which it combines. One solution is the percolation of features from ther inner morphemes to the outer morphemes with some process of feature unification. However, the obstacle of percolation constraints or stipulated features has lead some linguists to argue in favour of other frameworks such as, e.g., realizational morphology or parallel approaches like optimality theory. This paper proposes a linguistic analysis of two long distance dependencies in the morphology of Russian verbs, namely secondary imperfectivization and deverbal nominalization.We show how these processes can be reanalysed as local dependencies. Although finitestate frameworks are not bound by such linguistically motivated considerations, we present an implementation of our analysis as proposed in [1] that does not complicate the grammar or enlarge the network unproportionally.}, language = {en} } @inproceedings{Hillier2007, author = {Hillier, D. J.}, title = {On the influence of clumping on O and Wolf-Rayet spectra}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17903}, year = {2007}, abstract = {Overwhelming observational and theoretical evidence suggests that the winds of massive stars are highly clumped. We briefly discuss the influence of clumping on model diagnostics and the difficulties of allowing for the influence of clumping on model spectra. Because of its simplicity, and because of computational ease, most spectroscopic analyses incorporate clumping using the volume filling factor. The biases introduced by this approach are uncertain. To investigate alternative clumping models, and to help determine the validity of parameters derived using the volume filling factor method, we discuss results derived using an alternative model in which we assume that the wind is composed of optically thick shells.}, language = {en} } @inproceedings{Schrijvers2010, author = {Schrijvers, Tom}, title = {Overview of the monadic constraint programming framework}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-41411}, year = {2010}, abstract = {A constraint programming system combines two essential components: a constraint solver and a search engine. The constraint solver reasons about satisfiability of conjunctions of constraints, and the search engine controls the search for solutions by iteratively exploring a disjunctive search tree defined by the constraint program. The Monadic Constraint Programming framework gives a monadic definition of constraint programming where the solver is defined as a monad threaded through the monadic search tree. Search and search strategies can then be defined as firstclass objects that can themselves be built or extended by composable search transformers. Search transformers give a powerful and unifying approach to viewing search in constraint programming, and the resulting constraint programming system is first class and extremely flexible.}, language = {en} } @inproceedings{Daciuk2008, author = {Daciuk, Jan}, title = {Perfect hashing tree automata}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-27163}, year = {2008}, abstract = {We present an algorithm that computes a function that assigns consecutive integers to trees recognized by a deterministic, acyclic, finite-state, bottom-up tree automaton. Such function is called minimal perfect hashing. It can be used to identify trees recognized by the automaton. Its value may be seen as an index in some other data structures. We also present an algorithm for inverted hashing.}, language = {en} } @inproceedings{BetzRaiserFruehwirth2010, author = {Betz, Hariolf and Raiser, Frank and Fr{\"u}hwirth, Thom}, title = {Persistent constraints in constraint handling rules}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-41547}, year = {2010}, abstract = {In the most abstract definition of its operational semantics, the declarative and concurrent programming language CHR is trivially non-terminating for a significant class of programs. Common refinements of this definition, in closing the gap to real-world implementations, compromise on declarativity and/or concurrency. Building on recent work and the notion of persistent constraints, we introduce an operational semantics avoiding trivial non-termination without compromising on its essential features.}, language = {en} } @inproceedings{GonzalezCasacuberta2008, author = {Gonz{\´a}lez, Jorge and Casacuberta, Francisco}, title = {Phrase-based finite state models}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-27209}, year = {2008}, abstract = {In the last years, statistical machine translation has already demonstrated its usefulness within a wide variety of translation applications. In this line, phrase-based alignment models have become the reference to follow in order to build competitive systems. Finite state models are always an interesting framework because there are well-known efficient algorithms for their representation and manipulation. This document is a contribution to the evolution of finite state models towards a phrase-based approach. The inference of stochastic transducers that are based on bilingual phrases is carefully analysed from a finite state point of view. Indeed, the algorithmic phenomena that have to be taken into account in order to deal with such phrase-based finite state models when in decoding time are also in-depth detailed.}, language = {en} } @inproceedings{Seipel2010, author = {Seipel, Dietmar}, title = {Practical Applications of Extended Deductive Databases in DATALOG*}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-41457}, year = {2010}, abstract = {A wide range of additional forward chaining applications could be realized with deductive databases, if their rule formalism, their immediate consequence operator, and their fixpoint iteration process would be more flexible. Deductive databases normally represent knowledge using stratified Datalog programs with default negation. But many practical applications of forward chaining require an extensible set of user-defined built-in predicates. Moreover, they often need function symbols for building complex data structures, and the stratified fixpoint iteration has to be extended by aggregation operations. We present an new language Datalog*, which extends Datalog by stratified meta-predicates (including default negation), function symbols, and user-defined built-in predicates, which are implemented and evaluated top-down in Prolog. All predicates are subject to the same backtracking mechanism. The bottom-up fixpoint iteration can aggregate the derived facts after each iteration based on user-defined Prolog predicates.}, language = {en} } @inproceedings{GeskeWolf2010, author = {Geske, Ulrich and Wolf, Armin}, title = {Preface}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-41401}, year = {2010}, abstract = {The workshops on (constraint) logic programming (WLP) are the annual meeting of the Society of Logic Programming (GLP e.V.) and bring together researchers interested in logic programming, constraint programming, and related areas like databases, artificial intelligence and operations research. In this decade, previous workshops took place in Dresden (2008), W{\"u}rzburg (2007), Vienna (2006), Ulm (2005), Potsdam (2004), Dresden (2002), Kiel (2001), and W{\"u}rzburg (2000). Contributions to workshops deal with all theoretical, experimental, and application aspects of constraint programming (CP) and logic programming (LP), including foundations of constraint/ logic programming. Some of the special topics are constraint solving and optimization, extensions of functional logic programming, deductive databases, data mining, nonmonotonic reasoning, , interaction of CP/LP with other formalisms like agents, XML, JAVA, program analysis, program transformation, program verification, meta programming, parallelism and concurrency, answer set programming, implementation and software techniques (e.g., types, modularity, design patterns), applications (e.g., in production, environment, education, internet), constraint/logic programming for semantic web systems and applications, reasoning on the semantic web, data modelling for the web, semistructured data, and web query languages.}, language = {en} } @inproceedings{WalterZuritaHerasLeyder2007, author = {Walter, R. and Zurita-Heras, J. and Leyder, J.-C.}, title = {Probing clumpy stellar winds with a neutron star}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-18024}, year = {2007}, abstract = {INTEGRAL tripled the number of super-giant high-mass X-ray binaries (sgHMXB) known in the Galaxy by revealing absorbed and fast transient (SFXT) systems. Quantitative constraints on the wind clumping of massive stars can be obtained from the study of the hard X-ray variability of SFXT. A large fraction of the hard X-ray emission is emitted in the form of flares with a typical duration of 3 ksec, frequency of 7 days and luminosity of \$10^{36}\$ erg/s. Such flares are most probably emitted by the interaction of a compact object orbiting at \$\sim10~R_*\$ with wind clumps (\$10^{22 ... 23}\$ g) representing a large fraction of the stellar mass-loss rate. The density ratio between the clumps and the inter-clump medium is \$10^{2 ... 4}\$. The parameters of the clumps and of the inter-clump medium, derived from the SFXT flaring behavior, are in good agreement with macro-clumping scenario and line-driven instability simulations. SFXT are likely to have larger orbital radius than classical sgHMXB.}, language = {en} } @inproceedings{CohenLeuteneggerTownsend2007, author = {Cohen, David H. and Leutenegger, M. A. and Townsend, R. H. D.}, title = {Quantitative analysis of resolved X-ray emission line profiles of O stars}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-18115}, year = {2007}, abstract = {By quantitatively fitting simple emission line profile models that include both atomic opacity and porosity to the Chandra X-ray spectrum of ζ Pup, we are able to explore the trade-offs between reduced mass-loss rates and wind porosity. We find that reducing the mass-loss rate of ζ Pup by roughly a factor of four, to 1.5 × 10-6 M⊙ yr-1, enables simple non-porous wind models to provide good fits to the data. If, on the other hand, we take the literature mass-loss rate of 6×10-6 M⊙ yr-1, then to produce X-ray line profiles that fit the data, extreme porosity lengths - of h∞ ≈ 3 R∗ - are required. Moreover, these porous models do not provide better fits to the data than the non-porous, low optical depth models. Additionally, such huge porosity lengths do not seem realistic in light of 2-D numerical simulations of the wind instability.}, language = {en} } @inproceedings{Hara2006, author = {Hara, Yurie}, title = {Question intonation and lexicalized bias expression}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-10323}, year = {2006}, abstract = {This paper examines the interaction between different utterance types and the Japanese modal particle darou, and proposes that the decision-theoretic semantics accounts for the interaction among darou, sentence types and intonation.}, language = {en} } @inproceedings{KustererNagelWerneretal.2007, author = {Kusterer, D.-J. and Nagel, T. and Werner, K. and Feldmeier, Achim}, title = {Radiative transfer in CV disk winds}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17847}, year = {2007}, abstract = {Mass accretion onto compact objects through accretion disks is a common phenomenon in the universe. It is seen in all energy domains from active galactic nuclei through cataclysmic variables (CVs) to young stellar objects. Because CVs are fairly easy to observe, they provide an ideal opportunity to study accretion disks in great detail and thus help us to understand accretion also in other energy ranges. Mass accretion in these objects is often accompanied by mass outflow from the disks. This accretion disk wind, at least in CVs, is thought to be radiatively driven, similar to O star winds. WOMPAT, a 3-D Monte Carlo radiative transfer code for accretion disk winds of CVs is presented.}, language = {en} } @inproceedings{Brass2010, author = {Brass, Stefan}, title = {Range restriction for general formulas}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-41521}, year = {2010}, abstract = {Deductive databases need general formulas in rule bodies, not only conjuctions of literals. This is well known since the work of Lloyd and Topor about extended logic programming. Of course, formulas must be restricted in such a way that they can be effectively evaluated in finite time, and produce only a finite number of new tuples (in each iteration of the TP-operator: the fixpoint can still be infinite). It is also necessary to respect binding restrictions of built-in predicates: many of these predicates can be executed only when certain arguments are ground. Whereas for standard logic programming rules, questions of safety, allowedness, and range-restriction are relatively easy and well understood, the situation for general formulas is a bit more complicated. We give a syntactic analysis of formulas that guarantees the necessary properties.}, language = {en} } @inproceedings{CheneMoffatCrowther2007, author = {Chen{\´e}, A.-N. and Moffat, Anthony F. J. and Crowther, P. A.}, title = {Rapidly accelerating clumps in the winds of the very hot WNE Stars}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-18163}, year = {2007}, abstract = {We study the time variability of emission lines in three WNE stars : WR 2 (WN2), WR 3 (WN3ha) and WR152 (WN3). While WR 2 shows no variability above the noise level, the other stars do show variation, which are like other WR stars in WR 152 but very fast in WR 3. From these motions, we deduce a value of β ∼1 for WR 3 that is like that seen in O stars and β ∼2-3 for WR 152, that is intermediate between other WR stars and WR 3.}, language = {en} } @inproceedings{LeuteneggerCohenKahnetal.2007, author = {Leutenegger, M. A. and Cohen, David H. and Kahn, S. M. and Owocki, S. P. and Paerels, F. B. S.}, title = {Resonance scattering in the X-ray emission lines profiles of ζ Puppis}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-18085}, year = {2007}, abstract = {We present XMM-Newton Reflection Grating Spectrometer observations of pairs of X-ray emission line profiles from the O star ζ Pup that originate from the same He-like ion. The two profiles in each pair have different shapes and cannot both be consistently fit by models assuming the same wind parameters. We show that the differences in profile shape can be accounted for in a model including the effects of resonance scattering, which affects the resonance line in the pair but not the intercombination line. This implies that resonance scattering is also important in single resonance lines, where its effect is difficult to distinguish from a low effective continuum optical depth in the wind. Thus, resonance scattering may help reconcile X-ray line profile shapes with literature mass-loss rates.}, language = {en} } @inproceedings{FullertonMassaPrinja2007, author = {Fullerton, A. W. and Massa, D. L. and Prinja, R. K.}, title = {Revised mass-loss rates for O stars from the Pv resonance line}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17647}, year = {2007}, abstract = {The P v λλ1118, 1128 resonance doublet is an extraordinarily useful diagnostic of O-star winds, because it bypasses the traditional problems associated with determining mass-loss rates from UV resonance lines. We discuss critically the assumptions and uncertainties involved with using P v to diagnose mass-loss rates, and conclude that the large discrepancies between massloss rates determined from P v and the rates determined from "density squared" emission processes pose a significant challenge to the "standard model" of hot-star winds. The disparate measurements can be reconciled if the winds of O-type stars are strongly clumped on small spatial scales, which in turn implies that mass-loss rates based on Hα or radio emission are too large by up to an order of magnitude.}, language = {en} } @inproceedings{RossmanithBlaumKeiletal.2006, author = {Rossmanith, Eva and Blaum, Niels and Keil, Manfred and Langerwisch, F. and Meyer, Jork and Popp, Alexander and Schmidt, Michael and Schultz, Christoph and Schwager, Monika and Vogel, Melanie and Wasiolka, Bernd and Jeltsch, Florian}, title = {Scaling up local population dynamics to regional scales}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-7320}, year = {2006}, abstract = {In semi-arid savannas, unsustainable land use can lead to degradation of entire landscapes, e.g. in the form of shrub encroachment. This leads to habitat loss and is assumed to reduce species diversity. In BIOTA phase 1, we investigated the effects of land use on population dynamics on farm scale. In phase 2 we scale up to consider the whole regional landscape consisting of a diverse mosaic of farms with different historic and present land use intensities. This mosaic creates a heterogeneous, dynamic pattern of structural diversity at a large spatial scale. Understanding how the region-wide dynamic land use pattern affects the abundance of animal and plant species requires the integration of processes on large as well as on small spatial scales. In our multidisciplinary approach, we integrate information from remote sensing, genetic and ecological field studies as well as small scale process models in a dynamic region-wide simulation tool.
Interdisziplin{\"a}res Zentrum f{\"u}r Musterdynamik und Angewandte Fernerkundung Workshop vom 9. - 10. Februar 2006.}, language = {en} } @inproceedings{DeVaultStone2006, author = {DeVault, David and Stone, Matthew}, title = {Scorekeeping in an uncertain language game}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-10448}, year = {2006}, abstract = {Received views of utterance context in pragmatic theory characterize the occurrent subjective states of interlocutors using notions like common knowledge or mutual belief. We argue that these views are not compatible with the uncertainty and robustness of context-dependence in human–human dialogue. We present an alternative characterization of utterance context as objective and normative. This view reconciles the need for uncertainty with received intuitions about coordination and meaning in context, and can directly inform computational approaches to dialogue.}, language = {en} } @inproceedings{LueckingRieserStaudacher2006, author = {L{\"u}cking, Andy and Rieser, Hannes and Staudacher, Marc}, title = {SDRT and multi-modal situated communication}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-10348}, year = {2006}, abstract = {Classical SDRT (Asher and Lascarides, 2003) discussed essential features of dialogue like adjacency pairs or corrections and up-dating. Recent work in SDRT (Asher, 2002, 2005) aims at the description of natural dialogue. We use this work to model situated communication, i.e. dialogue, in which sub-sentential utterances and gestures (pointing and grasping) are used as conventional modes of communication. We show that in addition to cognitive modelling in SDRT, capturing mental states and speech-act related goals, special postulates are needed to extract meaning out of contexts. Gestural meaning anchors Discourse Referents in contextually given domains. Both sorts of meaning are fused with the meaning of fragments to get at fully developed dialogue moves. This task accomplished, the standard SDRT machinery, tagged SDRSs, rhetorical relations, the up-date mechanism, and the Maximize Discourse Coherence constraint generate coherent structures. In sum, meanings from different verbal and non-verbal sources are assembled using extended SDRT to form coherent wholes.}, language = {en} } @inproceedings{BlancConstantWatrin2008, author = {Blanc, Olivier and Constant, Matthieu and Watrin, Patrick}, title = {Segmentation in super-chunks with a finite-state approach}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-27133}, year = {2008}, abstract = {Since Harris' parser in the late 50s, multiword units have been progressively integrated in parsers. Nevertheless, in the most part, they are still restricted to compound words, that are more stable and less numerous. Actually, language is full of semi-fixed expressions that also form basic semantic units: semi-fixed adverbial expressions (e.g. time), collocations. Like compounds, the identification of these structures limits the combinatorial complexity induced by lexical ambiguity. In this paper, we detail an experiment that largely integrates these notions in a finite-state procedure of segmentation into super-chunks, preliminary to a parser.We show that the chunker, developped for French, reaches 92.9\% precision and 98.7\% recall. Moreover, multiword units realize 36.6\% of the attachments within nominal and prepositional phrases.}, language = {en} } @inproceedings{HerreHummel2010, author = {Herre, Heinrich and Hummel, Axel}, title = {Stationary generated models of generalized logic programs}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-41501}, year = {2010}, abstract = {The interest in extensions of the logic programming paradigm beyond the class of normal logic programs is motivated by the need of an adequate representation and processing of knowledge. One of the most difficult problems in this area is to find an adequate declarative semantics for logic programs. In the present paper a general preference criterion is proposed that selects the 'intended' partial models of generalized logic programs which is a conservative extension of the stationary semantics for normal logic programs of [Prz91]. The presented preference criterion defines a partial model of a generalized logic program as intended if it is generated by a stationary chain. It turns out that the stationary generated models coincide with the stationary models on the class of normal logic programs. The general wellfounded semantics of such a program is defined as the set-theoretical intersection of its stationary generated models. For normal logic programs the general wellfounded semantics equals the wellfounded semantics.}, language = {en} } @inproceedings{PrinjaHodgesMassaetal.2007, author = {Prinja, R. K. and Hodges, S. E. and Massa, D. L. and Fullerton, A. W. and Burnley, A. W.}, title = {Structure in the fast wind of NGC6543}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17788}, year = {2007}, abstract = {We exploit time-series \$FUSE\$ spectroscopy to {\it uniquely} probe spatial structure and clumping in the fast wind of the central star of the H-rich planetary nebula NGC~6543 (HD~164963). Episodic and recurrent optical depth enhancements are discovered in the P{\sc v} absorption troughs, with some evidence for a \$\sim\$ 0.17-day modulation time-scale. The characteristics of these features are essentially identical to the discrete absorption components' (DACs) commonly seen in the UV lines of massive OB stars, suggesting the temporal structures seen in NGC~6543 likely have a physical origin that is similar to that operating in massive, luminous stars. The mechanism for forming coherent perturbations in the outflows is therefore apparently operating equally in the radiation-pressure-driven winds of widely differing momenta (\$\mdot\$\$v_\infty\$\$R_\star^{0.5}\$) and flow times, as represented by OB stars and CSPN.}, language = {en} } @inproceedings{Didakowski2008, author = {Didakowski, J{\"o}rg}, title = {SynCoP : combining syntactic tagging with chunking using weighted finite state transducers}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-27172}, year = {2008}, abstract = {This paper describes the key aspects of the system SynCoP (Syntactic Constraint Parser) developed at the Berlin-Brandenburgische Akademie der Wissenschaften. The parser allows to combine syntactic tagging and chunking by means of constraint grammar using weighted finite state transducers (WFST). Chunks are interpreted as local dependency structures within syntactic tagging. The linguistic theories are formulated by criteria which are formalized by a semiring; these criteria allow structural preferences and gradual grammaticality. The parser is essentially a cascade of WFSTs. To find the most likely syntactic readings a best-path search is used.}, language = {en} } @inproceedings{IlarrazaGojenolaOronozetal.2008, author = {Ilarraza, Arantza D{\´i}az de and Gojenola, Koldo and Oronoz, Maite and Otaegi, Maialen and Alegria, I{\~n}aki}, title = {Syntactic error detection and correction in date expressions using finite-state transducers}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-27180}, year = {2008}, abstract = {This paper presents a system for the detection and correction of syntactic errors. It combines a robust morphosyntactic analyser and two groups of finite-state transducers specified using the Xerox Finite State Tool (xfst). One of the groups is used for the description of syntactic error patterns while the second one is used for the correction of the detected errors. The system has been tested on a corpus of real texts, containing both correct and incorrect sentences, with good results.}, language = {en} } @inproceedings{Townsend2007, author = {Townsend, R. H. D.}, title = {Techniques for simulating radiative transfer through porous media}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17866}, year = {2007}, abstract = {In this contribution, I discuss some basic techniques that can be used to simulate radiative transfer through porous media. As specific examples, I consider scattering transfer through a clumped slab, and X-ray emission line formation in a clumped wind.}, language = {en} } @inproceedings{Fernando2008, author = {Fernando, Tim}, title = {Temporal propositions as regular languages}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-27194}, year = {2008}, abstract = {Temporal propositions are mapped to sets of strings that witness (in a precise sense) the propositions over discrete linear Kripke frames. The strings are collected into regular languages to ensure the decidability of entailments given by inclusions between languages. (Various notions of bounded entailment are shown to be expressible as language inclusions.) The languages unwind computations implicit in the logical (and temporal) connectives via a system of finite-state constraints adapted from finite-state morphology. Applications to Hybrid Logic and non-monotonic inertial reasoning are briefly considered.}, language = {en} } @inproceedings{OPUS4-1412, title = {The 3rd international IEEE scientific conference on physics and control (PhysCon 2007) : September 3rd-7th 2007 at the University of Potsdam}, editor = {Kurths, J{\"u}rgen and Fradkov, Alexander and Chen, Guanrong}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-15228}, pages = {345}, year = {2007}, abstract = {During the last few years there was a tremendous growth of scientific activities in the fields related to both Physics and Control theory: nonlinear dynamics, micro- and nanotechnologies, self-organization and complexity, etc. New horizons were opened and new exciting applications emerged. Experts with different backgrounds starting to work together need more opportunities for information exchange to improve mutual understanding and cooperation. The Conference "Physics and Control 2007" is the third international conference focusing on the borderland between Physics and Control with emphasis on both theory and applications. With its 2007 address at Potsdam, Germany, the conference is located for the first time outside of Russia. The major goal of the Conference is to bring together researchers from different scientific communities and to gain some general and unified perspectives in the studies of controlled systems in physics, engineering, chemistry, biology and other natural sciences. We hope that the Conference helps experts in control theory to get acquainted with new interesting problems, and helps experts in physics and related fields to know more about ideas and tools from the modern control theory.}, language = {en} } @inproceedings{MassaPrinjaFullerton2007, author = {Massa, D. L. and Prinja, R. K. and Fullerton, A. W.}, title = {The effects of clumping on wind line variability}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-18095}, year = {2007}, abstract = {We review the effects of clumping on the profiles of resonance doublets. By allowing the ratio of the doublet oscillator strenghts to be a free parameter, we demonstrate that doublet profiles contain more information than is normally utilized. In clumped (or porous) winds, this ratio can lies between unity and the ratio of the f-values, and can change as a function of velocity and time, depending on the fraction of the stellar disk that is covered by material moving at a particular velocity at a given moment. Using these insights, we present the results of SEI modeling of a sample of B supergiants, ζ Pup and a time series for a star whose terminal velocity is low enough to make the components of its Si VIλλ1400 independent. These results are interpreted within the framewrok of the Oskinova et al. (2007) model, and demonstrate how the doublet profiles can be used to extract infromation about wind structure.}, language = {en} } @inproceedings{Hirschi2007, author = {Hirschi, Raphael}, title = {The impact of reduced mass loss rates on the evolution of massive stars}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17616}, year = {2007}, abstract = {Mass loss is a very important aspect of the life of massive stars. After briefly reviewing its importance, we discuss the impact of the recently proposed downward revision of mass loss rates due to clumping (difficulty to form Wolf-Rayet stars and production of critically rotating stars). Although a small reduction might be allowed, large reduction factors around ten are disfavoured. We then discuss the possibility of significant mass loss at very low metallicity due to stars reaching break-up velocities and especially due to the metal enrichment of the surface of the star via rotational and convective mixing. This significant mass loss may help the first very massive stars avoid the fate of pair-creation supernova, the chemical signature of which is not observed in extremely metal poor stars. The chemical composition of the very low metallicity winds is very similar to that of the most metal poor star known to date, HE1327-2326 and offer an interesting explanation for the origin of the metals in this star. We also discuss the importance of mass loss in the context of long and soft gamma-ray bursts and pair-creation supernovae. Finally, we would like to stress that mass loss in cooler parts of the HR-diagram (luminous blue variable and yellow and red supergiant stages) are much more uncertain than in the hot part. More work needs to be done in these areas to better constrain the evolution of the most massive stars.}, language = {en} } @inproceedings{KrtičkaPulsKubat2007, author = {Krtička, Jiri and Puls, Joachim and Kub{\´a}t, Jiř{\´i}}, title = {The influence of clumping on predicted O star wind parameters}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17969}, year = {2007}, abstract = {We study the influence of clumping on the predicted wind structure of O-type stars. For this purpose we artificially include clumping into our stationary wind models. When the clumps are assumed to be optically thin, the radiative line force increases compared to corresponding unclumped models, with a similar effect on either the mass-loss rate or the terminal velocity (depending on the onset of clumping). Optically thick clumps, alternatively, might be able to decrease the radiative force.}, language = {en} } @inproceedings{NajarroPulsHerreroetal.2007, author = {Najarro, F. and Puls, Joachim and Herrero, A. and Hanson, M. M. and Mart{\´i}n-Pintado, J. and Hillier, D. J.}, title = {Tracking the Clumping in OB Stars from UV to radio}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17701}, year = {2007}, abstract = {We review different line and continua diagnostics from the UV to radio, which can be utilized to simultaneously constrain the clumping structure throughout the stellar wind of massive OB stars.}, language = {en} } @inproceedings{YliJyrae2008, author = {Yli-Jyr{\"a}, Anssi}, title = {Transducers from parallel replace rules and modes with generalized lenient composition}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-27246}, year = {2008}, abstract = {Generalized Two-Level Grammar (GTWOL) provides a new method for compilation of parallel replacement rules into transducers. The current paper identifies the role of generalized lenient composition (GLC) in this method. Thanks to the GLC operation, the compilation method becomes bipartite and easily extendible to capture various application modes. In the light of three notions of obligatoriness, a modification to the compilation method is proposed. We argue that the bipartite design makes implementation of parallel obligatoriness, directionality, length and rank based application modes extremely easy, which is the main result of the paper.}, language = {en} } @inproceedings{AbdennadherIsmailKhoury2010, author = {Abdennadher, Slim and Ismail, Haythem and Khoury, Frederick}, title = {Transforming imperative algorithms to constraint handling rules}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-41533}, year = {2010}, abstract = {Different properties of programs, implemented in Constraint Handling Rules (CHR), have already been investigated. Proving these properties in CHR is fairly simpler than proving them in any type of imperative programming language, which triggered the proposal of a methodology to map imperative programs into equivalent CHR. The equivalence of both programs implies that if a property is satisfied for one, then it is satisfied for the other. The mapping methodology could be put to other beneficial uses. One such use is the automatic generation of global constraints, at an attempt to demonstrate the benefits of having a rule-based implementation for constraint solvers.}, language = {en} } @inproceedings{DzikovskaCallawayStoneetal.2006, author = {Dzikovska, Myroslava O. and Callaway, Charles B. and Stone, Matthew and Moore, Johanna D.}, title = {Understanding student input for tutorial dialogue in procedural domains}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-10193}, year = {2006}, abstract = {We present an analysis of student language input in a corpus of tutoring dialogue in the domain of symbolic differentiation. Our focus on procedural tutoring makes the dialogue comparable to collaborative problem-solving (CPS). Existing CPS models describe the process of negotiating plans and goals, which also fits procedural tutoring. However, we provide a classification of student utterances and corpus annotation which shows that approximately 28\% of non-trivial student language in this corpus is not accounted for by existing models, and addresses other functions, such as evaluating past actions or correcting mistakes. Our analysis can be used as a foundation for improving models of tutoring dialogue.}, language = {en} } @inproceedings{RomeroOwockiAraudoetal.2007, author = {Romero, G. E. and Owocki, S. P. and Araudo, A. T. and Townsend, R. H. D. and Benaglia, P.}, title = {Using gamma-rays to probe the clumped structure of stellar winds}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-18210}, year = {2007}, abstract = {Gamma-rays can be produced by the interaction of a relativistic jet and the matter of the stellar wind in the subclass of massive X-ray binaries known as "microquasars". The relativistic jet is ejected from the surroundings of the compact object and interacts with cold protons from the stellar wind, producing pions that then quickly decay into gamma-rays. Since the resulting gamma-ray emissivity depends on the target density, the detection of rapid variability in microquasars with GLAST and the new generation of Cherenkov imaging arrays could be used to probe the clumped structure of the stellar wind. In particular, we show here that the relative fluctuation in gamma rays may scale with the square root of the ratio of porosity length to binary separation, \$\sqrt{h/a}\$, implying for example a ca. 10\% variation in gamma ray emission for a quite moderate porosity, h/a ∼ 0.01.}, language = {en} }