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- Eriksson, Per Erik
(författare)
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Videography as production nexus : digital film cameras, media mangement and the distribution of creativity
- 2013
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This thesis is about new digital moving image recording technologies and how they augment the distribution of creativity and the flexibility in moving image production systems, but also impose constraints on how images flow through the production system. The central concept developed in this thesis is ‘creative space’ which links quality and efficiency in moving image production to time for creative work, capacity of digital tools, user skills and the constitution of digital moving image material. The empirical evidence of this thesis is primarily based on semi-structured interviews conducted with Swedish film and TV production representatives.This thesis highlights the importance of pre-production technical planning and proposes a design management support tool (MI-FLOW) as a way to leverage functional workflows that is a prerequisite for efficient and cost effective moving image production.
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| 3. |
- Andersson, Ingemar, et al.
(författare)
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A Parametric Model for Ionization Current in a Four Stroke SI Engine
- 2009
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Ingår i: JOURNAL OF DYNAMIC SYSTEMS MEASUREMENT AND CONTROL-TRANSACTIONS OF THE ASME. - : ASME International. - 0022-0434 .- 1528-9028. ; 131:2, s. 021001-
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Tidskriftsartikel (refereegranskat)abstract
- A model for the thermal part of an ionization signal is presented that connects the ionization current to cylinder pressure and temperature in a spark ignited internal combustion engine. One strength of the model is that, after calibration, it has only two free parameters: burn angle and initial kernel temperature. By fitting the model to a measured ionization signal, it is possible to estimate both cylinder pressure and temperature, where the pressure is estimated with good accuracy. The model approach is validated on engine data. Cylinder pressure and ionization current data were collected on a Saab four-cylinder spark ignited engine for a variation in ignition timing and air-fuel ratio. The main result is that the parametrized ionization current model can be used to estimating combustion properties as pressure, temperature, and content of nitric oxides based on measured ionization currents. The current status of the model is suitable for off-line analysis of ionization currents and cylinder pressure. This ionization current model not only describes the connection between the ionization current and the combustion process, but also offers new possibilities for engine management system to control the internal combustion engine.
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| 4. |
- Andersson, Ingemar, 1969, et al.
(författare)
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A Parametric Model for Ionization Current in a Four Stroke SI Engine
- 2009
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Ingår i: Journal of Dynamic Systems, Measurement and Control, Transactions of the ASME. - 0022-0434 .- 1528-9028. ; 131:2, s. 1-11
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Tidskriftsartikel (refereegranskat)abstract
- A model for the thermal part of an ionization signal is presented that connects the ionization current to cylinder pressure and temperature in a spark ignited internal combustion engine. One strength of the model is that it after calibration has only two free parameters, burn angle and initial kernel temperature. By fitting the model to a measured ionization signal it is possible to estimate both cylinder pressure and temperature, where the pressure is estimated with good accuracy. The model approach is validated on engine data. Cylinder pressure and ionization current data was collected on a Saab 4-cylinder SI engine for a variation in ignition timing and air-fuel ratio.The main result is that the parameterized ionization current model can be used to estimating combustion properties as pressure, temperature and contentof nitric oxides based on measured ionization currents.The current status of the model is suitable for off-line analysis of ionization currents and cylinder pressure.This ionization current model not only describes the connection between the ionization current and the combustion process, it also offers new possibilities for EMS to control the internal combustion engine.
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| 5. |
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| 6. |
- Andersson, Ingemar, et al.
(författare)
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Ion Sensing for Combustion Stability Control of a Spark Ignited Direct Injected Engine
- 2000
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Ingår i: Electronic Engine Controls.
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Konferensbidrag (refereegranskat)abstract
- The combustion stability of a direct injected spark ignited engine depends on the injection timing and it is desirable to have a controller that minimizes the combustion variability. A novel approach for determining combustion stability in stratified mode is presented that rely on the ionization current and enables closed loop control of the injection timing. The coefficient of variation for IMEP is used as a measure of combustion stability and a connection between maximum torque and low combustion variability is pointed out. The coefficient of variation of the ion current integral is well correlated with the coefficient of variation for IMEP. Furthermore, it is shown how the integral of the ion current together with COV(ion integral) can be used to determine the combustion stability and to distinguish high combustion stability from misfire.
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| 9. |
- Annerbrink, Kristina, 1974, et al.
(författare)
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Association between the catechol-O-methyltransferase Val158Met polymorphism and panic disorder: A replication
- 2010
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Ingår i: Psychiatry Research. - : Elsevier Science B.V., Amsterdam.. - 0165-1781 .- 1872-7123. ; 178:1, s. 196-198
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Tidskriftsartikel (refereegranskat)abstract
- The association between the catechol-O-methyltransferase Val158Met polymorphism and panic disorder was studied in a Swedish sample of 211 patients and 452 controls. We found a significant excess of the Val allele in both male and female patients, the latter but not the former finding being in line with previous studies.
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| 10. |
- Annerbrink, Kristina, 1974, et al.
(författare)
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Panic disorder is associated with the Val308Iso polymorphism in the hypocretin receptor gene
- 2011
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Ingår i: PSYCHIATRIC GENETICS. - : Rapid Communications of Oxford Ltd. - 0955-8829 .- 1473-5873. ; 21:2, s. 85-89
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Tidskriftsartikel (refereegranskat)abstract
- Background Orexin A and B are neuropeptides influencing, for example, arousal and respiration. Although panic disorder is characterized by both enhanced proneness for arousal and by respiratory abnormalities, the possible influence of orexin-related genes on the risk of developing this disorder has not been studied until now. Methods We have analyzed the Ile408Val polymorphism in the hypocretin receptor 1 (HCRTR1) gene and the Val308Iso (G1246A) polymorphism in the hypocretin receptor 2 (HCRTR2) gene in a sample of 215 panic disorder patients and 454 controls. Results Although the polymorphism in the HCRTR1 did not differ between groups, the Iso allele of the HCRTR2 polymorphism was significantly more frequent in patients than in controls. After the population was divided according to sex, the association between the Iso allele of the Val308Iso polymorphism and panic disorder was observed only in female patients. Conclusion Our results suggest that the HCRTR2 polymorphism may be of importance for the pathophysiology of panic disorder. The results should be regarded as preliminary until replicated in an independent sample. This indicates that further research on the possible role of orexin in panic disorder may prove rewarding.
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