| 1. |
- Carlsson, Fredrik, et al.
(författare)
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A Conceptual Framework for Time Distortion Analysis in Method Components
- 2014
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Ingår i: Enterprise, Business-Process and Information Systems Modeling. - Berlin, Heidelberg : Springer. - 9783662437445 - 9783662437452 ; , s. 454-463
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Konferensbidrag (refereegranskat)abstract
- The “software crisis” is still a prevailing problem to many organizations despite existence of advanced systems engineering methods, techniques for project planning and method engineering; systems engineering project still struggle to deliver on time and budget, and with sufficient quality. Existing research stresses that time leakage has a lever effect on economic outcome, which is not addressed in the abovementioned approaches. As part of an on-going research project we therefore extend existing method engineering concept to include time distortion analysis. This allows for analysis of resource use (productivity) in execution of method components. It has the potential to act as a) a tool for improving the execution of systems engineering processes, or b) criteria for selecting method parts to improve the systems engineering processes.
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| 2. |
- Karlsson, Fredrik, 1974-, et al.
(författare)
-
A conceptual framework for time distortion analysis in method components
- 2014
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Ingår i: Exploring Modelling Methods for Systems Analysis and Design (EMMSAD'14). - Berlin Heidelberg : Springer Berlin/Heidelberg. - 9783662437445 ; , s. 454-463
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Konferensbidrag (refereegranskat)abstract
- The “software crisis” is still a prevailing problem to many organizations despite existence of advanced systems engineering methods, techniques for project planning and method engineering; systems engineering project still struggle to deliver on time and budget, and with sufficient quality. Existing research stresses that time leakage has a lever effect on economic outcome, which is not addressed in the abovementioned approaches. As part of an on-going research project we therefore extend existing method engineering concept to include time distortion analysis. This allows for analysis of resource use (productivity) in execution of method components. It has the potential to act as a) a tool for improving the execution of systems engineering processes, or b) criteria for selecting method parts to improve the systems engineering processes.
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| 3. |
- Barabash, Stas, et al.
(författare)
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Mars Orbiting Plasma Surveyor (MOPS)
- 2006
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Ingår i: Proceedings of the 6th IAA International Conference on Low-Cost Planetary Missions. ; , s. 227-232
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Mars Orbiting Plasma Surveyor (MOPS) is a microsatellite mission focused on studies of the near -Mars environment and the planet - solar wind interaction. The recent findings by the ESA Mars Express mission further highlighted the complexity of the processes taking place at the planet resulting from the solar wind interaction that strongly affect the planet's atmosphere. However, despite many previous Martian missions carrying different types of space plasma experiments, a comprehensive investigation including simultaneous measurements of particles, fields, and waves has never been performed. We consider a spinning spacecraft of a wet mass of 76.1 kg with a 9.7 kg payload, which can “hitchhike” on another platform until Mars orbit insertion, and then be released into a suitable orbit. The spacecraft design is based on the experience gained in very successful Swedish space plasma missions, Viking, Freja, Astrid-1, and Astrid-2. In the present mission design, the MOPS spacecraft is equipped with its own 1m high gain antenna for direct communication with the Earth. The payload includes a wave experiment with wire booms, magnetometer with a rigid boom, Langmuir probes, electron and ion energy spectrometers and an ion mass analyzer. An energetic neutral atom imager and an UV photometer may complete the core payload. One of the proposed scenarios is piggy - backing on the Russian Phobos - Grunt mission to be launched to Mars in 2011.
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| 4. |
- Larsson, Bengt, et al.
(författare)
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Molecular oxygen in the rho Ophiuchi cloud
- 2007
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Ingår i: Astronomy & Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 466:3, s. 5-
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Tidskriftsartikel (refereegranskat)abstract
- Context: Molecular oxygen, O2, has been expected historically to be an abundant component of the chemical species in molecular clouds and, as such, an important coolant of the dense interstellar medium. However, a number of attempts from both ground and from space have failed to detect O2 emission.Aims: The work described here uses heterodyne spectroscopy from space to search for molecular oxygen in the interstellar medium. Methods: The Odin satellite carries a 1.1 m sub-millimeter dish and a dedicated 119 GHz receiver for the ground state line of O2. Starting in 2002, the star forming molecular cloud core ρ Oph A was observed with Odin for 34 days during several observing runs.Results: We detect a spectral line at v_LSR =+3.5 km s-1 with Δ v_FWHM=1.5 km s-1, parameters which are also common to other species associated with ρ Oph A. This feature is identified as the O2 (NJ = 11 - 1_0) transition at 118 750.343 MHz.Conclusions: The abundance of molecular oxygen, relative to H{2} , is 5 × 10-8 averaged over the Odin beam. This abundance is consistently lower than previously reported upper limits.Based on observations with Odin, a Swedish-led satellite project funded jointly by the Swedish National Space Board (SNSB), the Canadian Space Agency (CSA), the National Technology Agency of Finland (Tekes) and Centre National d'Étude Spatiale (CNES). The Swedish Space Corporation has been the industrial prime contractor and also is operating the satellite. Appendix A is only available in electronic form at http://www.aanda.org
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