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1001. Modeling Scattered Light in the HST Faint Object Spectrograph
... We describe the software tool bspec which models the dispersion and diffraction of light in the HST Faint Object Spectrograph. ... The HST Faint Object Spectrograph (FOS) uses blazed, ruled gratings and detectors that are sensitive over wide wavelength ranges. ... The program bspec has been developed to model the dispersion and diffraction of light in the FOS with an accuracy sufficient for the estimation of scattered light contamination in observed FOS data. ... We run bspec as follows: . ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/bushouseh.html -- 13.2 Кб -- 03.11.2000
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1002. Stochastic Relaxation as a Tool for Bayesian Modeling of Astronomical Images
... Next: Spatial Models and Up: Statistical Analysis Previous: Statistical Consulting Center . ... Sampling techniques are used to explore the Bayesian posterior density in imaging problems. ... An alternative approach is to adopt a data modeling perspective of the imaging problem. ... Stochastic Relaxation (SR) is such a method, with foundations in statistical physics. ... Figure: Panel 1: artificial sky field. ... Panel 3: ML MAP estimator. ... This ME estimator is depicted in Panel 4 of Figure . ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/buskoi.html -- 12.8 Кб -- 03.11.2000
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1003. An Information System for Proposal Submission and Handling
... The Proposal Handling and Reporting System (PHRS) is a software system aimed at supporting ESO's Observing Programme Committee (OPC) during the entire review process of the Observing Time Proposals. ... PHRS was already successfully employed twice (for Periods 54 and 55), handling over 250 (peak) proposal submissions per day. ... The Proposal Handling and Reporting System (PHRS) at ESO is a software system aimed at tackling this problem and supporting the OPC. ... Valid proposals are peer-reviewed. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/chavana.html -- 13.5 Кб -- 03.11.2000
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1004. A New PROS Task for Calculating HRI Source Intensities or Upper Limits
... Next: The PROS Big Up: Software Systems Previous: Data Reduction Software . ... The srcinten task provides PROS users with a tool to compute count rates for point sources in the ROSAT High Resolution Imager (HRI). ... Corrected upper limits are cited at locations where the count rate falls below the source detection threshold. ... Srcinten is a new PROS task that computes and applies the above correction factors to the net counts in a user-specified aperture. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/chenj.html -- 11.4 Кб -- 03.11.2000
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1005. Migrating the Starlink Network from VMS to Unix
... Next: Porting CGS4DR to Up: Software Systems Previous: FTOOLS: A FITS . ... In order to exploit the most cost-effective hardware and to maintain compatibility with the international community, Starlink is migrating from an entirely VAX/VMS based service to UNIX-based systems. ... In order to exploit the most cost-effective hardware and to maintain compatibility with the international community, the formerly VMS-only Starlink Project has switched to using Unix-based computers. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/claytonc.html -- 13.2 Кб -- 03.11.2000
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1006. ASC Data Structures and Model
... Next: Reformatting the Ginga Up: Data Models and Previous: Proposed FITS Keywords . ... SAO/ASC, 60 Garden St., Cambridge, Mass. ... The Dynamic Data File (DDF) abstraction is being developed to provide sophisticated, format-independent filtering capabilities and support for multiple file formats. The DDF interface library will use the Open-IRAF data structure libraries to provide environment independent access to the DDF data structures from any C or FORTRAN host-level application. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/conroym.html -- 13.8 Кб -- 03.11.2000
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1007. Reformatting the Ginga Database to FITS and the Creation of a Data Products
... We present status reports on projects to make both raw data and products from the Ginga X-ray astronomy satellite available in FITS formats to the general astronomical community. ... In parallel with the data reformatting project, a database of software products (light curves and spectra) is being produced at Leicester University which will also be made widely available. ... In parallel with creating hypercube format data products, the output routines are being rewritten to write FITS files as well....
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Ссылки http://www.adass.org/adass/proceedings/adass94/corbetr.html -- 15.1 Кб -- 03.11.2000
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1008. The OGIP FITS Working Group
... Next: Organizing Observational Data Up: Data Models and Previous: Source-searching in Photon-event . ... We present an overview of the workings of the OGIP FITS Working Group (OFWG). ... The Office of Guest Investigator Programs (OGIP) at the Goddard Space Flight Center has organized a working group to identify appropriate conventions, and, with community support, to encourage adherence to these conventions. ... serving the entire FITS community . ... fits_info/ofwg_minutes . ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/corcoranm.html -- 6.5 Кб -- 03.11.2000
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1009. The Data Analysis System For The PDS Detector On-board the SAX Satellite
... Next: Use of Inheritance Up: Software Systems Previous: The SAX-LEGSPC Data . ... PDS is the high energy (15--300 keV) instrument on board the SAX satellite (Scarsi 1993). ... During the ground calibrations, data from PDS will be acquired using LABEN ITE (Instrument Test Equipment), a complex data acquisition system composed by a probe of the data bus on SAX (BTB probe) and a VAXstation. ... External tools to perform more sophisticated analysis can be used on data extracted from the database. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/dalfiumed.html -- 14.1 Кб -- 03.11.2000
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1010. The Array Limited Infrared Control Environment
... Next: The SAX-LEGSPC Data Up: Software Systems Previous: Porting CGS4DR to . ... This paper describes the recently commissioned Array Limited Infrared Control Environment (ALICE), used to control a new array imager, IRCAM3, on UKIRT. ... What was needed was a flexible and extensible system capable of driving the new generation of arrays to the limits of their performance, hence the term Array Limited Infrared Control Environment (ALICE). ... Thus a full 4-bytes pixel frame takes 5s to transfer. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/dalyp1.html -- 13.0 Кб -- 03.11.2000
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1011. Porting CGS4DR to Unix
... This paper discusses the port of the CGS4 Data Reduction system to Unix, and describes a novel solution to some non-portable code. The CGS4 Data Reduction system, CGS4DR, is a suite of tasks for automatically reducing data from the long-slit spectrometer on the 3.8m United Kingdom Infra-Red Telescope (UKIRT) on Mauna Kea, Hawai`i (Daly et al. 1994 and references therein). ... In porting this application, a new task was created to replace the ISAM file: QMAN, the generic queue manager (Daly 1994). ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/dalyp2.html -- 13.6 Кб -- 03.11.2000
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1012. Clustering Analysis Algorithms and Their Applications to Digital POSS-II
... We report on the preliminary results of experiments using a Bayesian cluster method to cluster objects present in photographic images of the POSS-II. ... We believe that the application of such algorithms to large-scale astronomical sky surveys can aid in cataloging the detected objects, and may even have the potential to discover new categories of objects. ... We have thus started to explore new clustering analysis and unsupervised classification techniques for this task. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/decarvalhor.html -- 13.1 Кб -- 03.11.2000
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1013. Wavelength Calibration at Moderately High Resolution
... The calibration of astrophysical spectra in wavelength based on calibration lamp data suffers from different kinds of uncertainties. Besides inaccuracies in the observational phase, common data reduction practice adds ``pixelation'' errors, due to the fact that the centering method does not use the correct PSF. These model mismatch errors depend, for a given feature, on the sub-pixel location of the line center (David & Verschueren, private communication). ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/decuyperjp.html -- 12.1 Кб -- 03.11.2000
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1014. The PROS Big Picture: A High-Level Representation of a Software System
... Next: An IRAF-Independent Interface Up: Software Systems Previous: A New PROS . ... We present a high-level representation of the packages and tasks within IRAF/PROS. ... We have produced a high-level overview of PROS. ... The incremental stages were the short-term goals: a project overview diagram (i.e., an organizational diagram of software modules); high-level diagram (i.e., a bubble diagram of each module in the system); and unifying element tables (i.e., tables of task vs. software attributes)....
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Ссылки http://www.adass.org/adass/proceedings/adass94/depontej.html -- 10.7 Кб -- 03.11.2000
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1015. The New Astrophysics Data System
... The Astrophysics Data System (ADS) is moving towards public domain access software for its data holdings. Several ADS services are already accessible through the World Wide Web (WWW) (e.g., abstract service, catalogs, Einstein archive) and more are planned. ... The main emphasis of the restructured ADS Project will be the operation and development of the ADS Astrophysics Science Information and Abstract Service (ASIAS) (formerly the ADS Abstract Service). ... Figure: ASIAS query result. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/eichhorng.html -- 11.3 Кб -- 03.11.2000
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1016. Tcl/Tk with DRAMA - A Natural for Building User Interfaces to Instrumentation
... DRAMA allows you to build distributed real-time systems consisting of a set of event-driven tasks. ... These are tested and controlled by higher-level tasks whose user interfaces are provided by Tcl/Tk and which communicate with the rest of the system using purpose-built Tcl commands that invoke the DRAMA system routines. ... Its basic unit is the Task . ... The combination of DRAMA and Tcl/Tk let us put together simple user interfaces for testing individual components of the 2dF system. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/farrellt1.html -- 13.4 Кб -- 03.11.2000
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1017. Use of Inheritance Techniques in Real-Time Systems under DRAMA
... In real-time instrument control systems such as the AAO's DRAMA system, where relatively complex individual tasks control their own parts of a system (spectrograph, camera, telescope, etc), there are often significant similarities between tasks. ... DRAMA is written in C, but combines ideas from the X Windows Xt toolkit with its use of named actions in tasks to provide a successful, effective, inheritance mechanism. ... This action is used to set the simulation mode of our tasks. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/farrellt2.html -- 13.0 Кб -- 03.11.2000
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1018. What is an Astronomical Data Model?
... Next: Propagating Uncertainties and Up: Data Models and Previous: Data Models and . ... Using techniques from semantic data modeling and object-oriented data modeling, an astronomical data model is identified as a kind of conceptual analysis. The general characteristics of such a model are presented, as well as its relationship to computer-based data structures and the FITS standard for transporting data. ... Data structures are used to implement a data model. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/farrisa.html -- 15.7 Кб -- 03.11.2000
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1019. The SAX-LEGSPC Data Reduction and Analysis System: An Example of a Minimalist
... Next: The Data Analysis Up: Software Systems Previous: The Array Limited . ... We present the data reduction and analysis system for the Low Energy Gas Scintillation Proportional Counter to be flown on the Italian-Dutch X-ray satellite SAX . ... Also, the problems encountered in following the chosen approach are described. In particular, the advantages and disadvantages of using FITS for all the steps in the data analysis chain are discussed. ... conversion to FITS . ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/favataf.html -- 13.3 Кб -- 03.11.2000
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1020. Statistical Consulting Center for Astronomy
... We announce the formation of a Statistical Consulting Center for Astronomy (SCCA), designed to provide prompt high-quality advice on statistical and methodological issues to the astronomical community. ... The astronomer extracting scientifically useful information from astronomical data often encounters complex and subtle problems. ... We have created the Statistical Consulting Center for Astronomy (SCCA) to help bridge the wide gap between the astronomical and statistical communities. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/feigelsone.html -- 15.2 Кб -- 03.11.2000
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