77631. |
- Sörensson, Robert, 1969-
(author)
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Estimation of interregional empty rail freight car flows
- 2002
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Reports (pop. science, debate, etc.)abstract
- An important and to often neglected aspect in every freight transportation system is the presence of empty car flows. Empty car flows arise due to variations in the transportation demand, in the sense that in bound and out bound transportation flows differ with respect to volume or weight. This heterogeneity manifest variations in loaded as well as empty freight flows as a result of different branch structures and trade patterns between regions. Since a train or block generally is composed of both loaded and empty cars the empty ones contribute to a significant congestion effect in the freight transportation network. Thus it is motivated to explicitly consider empty freight car flows in tactical and strategic network flow models. This paper presents a method to estimate the empty car freight flows; the method has been tested on data from the Swedish freight railway system. We provide an estimation procedure for the static deterministic case, cast as a mathematical programming problem. Our approach enhances the modelling capabilities compared to existing models through the possibility to include expertise knowledge. The estimated empty car flow may serve as an input in a column generation model that solves a multimodal multicommodity network flow problem.
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77632. |
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77633. |
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77634. |
- Sörensson, Robert, 1969-, et al.
(author)
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Rapport om Norrlands tillväxt 1993-2002
- 2006
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Reports (other academic/artistic)abstract
- Under slutet av nittiotalet intensifierades diskussionen om den ekonomiska tillväxten i Norrland. Under perioden 1995 till 2002 uppvisade Norrland tydliga svaghetstecken. I vissa avseenden var perioden jämförbar med den första stora och betydligt längre krisperioden för Norrland åren1955 till 1970. En diskussion förs om Norrlands framtid och förutsättningar för tillväxt i regionen. Denna rapport har som syfte att presentera statistik över utvecklingen för att därigenom peka på det allvarliga läget för regionen samt skapa en grund för en offentlig diskussion om regionens framtid.
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77635. |
- Sörensson, Robert, 1969-
(author)
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Systemanalys av godstransporter : Simulering av en uppgraderad Inlandsbana
- 1998
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Reports (other academic/artistic)abstract
- I föreliggande rapport presenteras en systemoptimeringsanalys av godstransporterna längs Inlandsbanan och det konkurrerande eller komplimenterande vägnätet längsefter banans sträckning. Syftet är att analysera och identifiera de godsflödesförändringar som kan uppstå i detta godstransportsystem om Inlandsbanan integreras med rikets övriga stomjärnvägar till ett sammanhängande godstrafiksystem. Dessutom granskas och beskrivs en svensk tillämpning av systemoptimeringsmodellen STAN som bland annat används i den svenska investeringsplaneringen för infrastruktur i det nationella godstransportsystemet.
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77636. |
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77637. |
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77638. |
- Sörensson, Tomas, 1957-
(author)
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The Equity Risk Premium on the Swedish Stock Market
- 2011
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Reports (other academic/artistic)abstract
- The equity risk premium is a very important part of every valuation. When valuing a company you have to decide on the level of the equity risk premium. The decision influences the value to great extent. To aid in that decision we estimate the equity risk premium on the Swedish stock market by three methods. Our estimates cover the period 1919-2010. The historical equity risk premium for 1919 – 2009 is on average 5.9 percent (arithmetic) per year and 3.3 percent (geometric) per year. The survey data for 2010 is 4.6 percent and the implied equity risk premium for 2008 is 2.1 percent. We use the 10-year governmental bond yield as risk-free interest rate. Our conclusion is that, referring to survey data, the equity risk premium to use in a valuation of a Swedish company 2010 should be around 4.5 percent.
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77639. |
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77640. |
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