| 1. |
- Andersson Hultgren, Jonas, 1987-, et al.
(författare)
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Effects of motion parallax in driving simulators
- 2012
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Ingår i: Proceedings of the Driving Simulation Conference Europe 2012.
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Konferensbidrag (refereegranskat)abstract
- Motion parallax due to the driver’s head movement have been implemented and tested in VTI Driving Simulator III. An advanced camera-based system was used to track the head movements of the driver. The output from the tracking system was fed to the simulation software, which used low-pass filtering and a forward prediction algorithm to calculate an offset. The offset was then used by the graphics software to display the correct image to the driver.The effects of driving with motion parallax in the simulator were also observed by an initial study. During the experiment, the subjects caught up with several slower vehicles which forced the driver to make an overtaking maneuver. Oncoming traffic forced the subject to search for a suitable gap for overtaking. The study also included a speed perception test. The results from the study showed no difference in lateral positioning when running behind a slower vehicle nor in speed perception with and without motion parallax.
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| 2. |
- Calles, Britt-Marie, et al.
(författare)
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Grunddatadomän transportsystem: Kompletterande underlag till den utforskande förstudien
- 2022
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- I mars 2022 levererade Trafikverket och samverkande myndigheter (Transportstyrelsen, Sjöfartsverket, Luftfartsverket, Trafikanalys och VTI, Statens väg- och transportforskningsinstitut) en rapport som sammanfattade den utforskande utvecklingen att utreda en grunddatadomän för transportsystemet. Föreliggande rapport är en komplettering till den ursprungliga rapporten och utgör Trafikverkets inklusive samverkande myndigheters sammantagna underlag (utforskande utveckling) för etablering av en grunddatadomän för transportsystemet. Arbetet har bedrivits under ledning av Myndigheten för digital förvaltning (DIGG) med Trafikverket som ansvarig för den utforskande utvecklingen. Till rapporten hör en bilaga, se länk till höger.Ursprunglig rapport: Grunddatadomän transportsystem: Samverkansuppdrag mellan transportmyndigheterna för att bedriva en utforskande utveckling att utreda en grunddatadomän för information kopplat till transportsystemet
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| 3. |
- Engström, Jonas, et al.
(författare)
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Modulärt batteribytessystem för arbetsmaskiner – slutrapport
- 2024
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Modular battery swap system for work machinesThe project has developed and demonstrated how a modular battery swap system can be used in electric work machines in various industries. The purpose of the project was to demonstrate innovative technology where battery swap technology enables battery-powered machines in agriculture and forestry. The project has completed the following:1. Designed and built a modular battery pack for work machines2. Designed and built an automatic battery swap station3. Completed a prototype for an autonomous electric agricultural machine4. Electrically converted a machine for forestryWe have succeeded in creating a working battery swap concept. The concept has been shown at several different demo events. The project has received a lot of positive publicity in the media. The project creates opportunities to run work machines in agriculture and forestry without the batteries needing to be unnecessarily large, heavy and expensive to carry with the machine in the field.Building electrified work machines is not a big deal. What is new in this project is that we demonstrate a battery replacement system for work machines - that works in real life!The project group has worked hard together for two years and achieved brilliant results that we are very pleased with. As expected, it took some time to agree on a concept for the common component battery pack, but once it was set, work took off.In the project, we have built seven battery packs, two electric work machines and a battery swap station including electrical system, control system and other adaptations. This would not have been possible without a dedicated and very talented project group!
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| 4. |
- Jansson, Desirée, et al.
(författare)
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Intestinal spirochaetes (genus Brachyspira) colonise wild birds in the southern Atlantic region and Antarctica
- 2015
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Ingår i: Infection Ecology & Epidemiology. - : Informa UK Limited. - 2000-8686. ; 5
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Tidskriftsartikel (refereegranskat)abstract
- INTRODUCTION: The genus Brachyspira contains well-known enteric pathogens of veterinary significance, suggested agents of colonic disease in humans, and one potentially zoonotic agent. There are recent studies showing that Brachyspira are more widespread in the wildlife community than previously thought. There are no records of this genus in wildlife from the southern Atlantic region and Antarctica. Our aim was therefore, to determine whether intestinal spirochaetes of genus Brachyspira colonise marine and coastal birds in this region.METHOD: Faecal samples were collected from marine and coastal birds in the southern Atlantic region, including sub-Antarctic islands and Antarctica, in 2002, 2009, and 2012, with the aim to isolate and characterise zoonotic agents. In total, 205 samples from 11 bird species were selectively cultured for intestinal spirochaetes of genus Brachyspira. To identify isolates to species level, they were subjected to phenotyping, species-specific polymerase chain reactions, sequencing of partial 16S rRNA, NADH oxidase (nox), and tlyA genes, and phylogenetic analysis. Antimicrobial susceptibility tests were performed.RESULTS: Fourteen unique strains were obtained from 10 birds of three species: four snowy sheathbills (Chionis albus), three kelp geese (Chloephaga hybrida subsp. malvinarum), and three brown skua (Stercorarius antarcticus subsp. lonnbergi) sampled on the Falkland Islands, Tierra del Fuego in Argentina, South Georgia, South Shetland Islands, and the Antarctic Peninsula. Five Brachyspira strains were closely related to potentially enteropathogenic Brachyspira sp. of chickens: B. intermedia (n=2, from snowy sheathbills), and B. alvinipulli (n=3, from a kelp goose and two snowy sheathbills). Three strains from kelp geese were most similar to the presumed non-pathogenic species 'B. pulli' and B. murdochii, whereas the remaining six strains could not be attributed to currently known species. No isolates related to human strains were found. None of the tested strains showed decreased susceptibility to tiamulin, valnemulin, doxycycline, tylvalosin, lincomycin, or tylosin.CONCLUSIONS: This is the first report of intestinal spirochaetes from this region. Despite limitations of current diagnostic methods, our results, together with earlier studies, show that Brachyspira spp., including potentially pathogenic strains, occur globally among free-living avian hosts, and that this genus encompasses a higher degree of biodiversity than previously recognised.
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| 5. |
- Jansson, Jonas
(författare)
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Collision Avoidance Theory : with Application to Automotive Collision Mitigation
- 2005
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Avoiding collisions is a crucial issue in most transportation systems as well as in many other applications. The task of a collision avoidance system is to track objects of potential collision risk and determine any action to avoid or mitigate a collision. This thesis presents theory for tracking and decision making in collision avoidance systems. The main focus is how to make decisions based on uncertain estimates and in the presence of multiple obstacles. A general framework for dealing with nonlinear dynamic systems and arbitrary noise distributions in collision avoidance decision making is proposed. Some novel decision functions are also suggested. Furthermore, performance evaluations using simulated and experimental data are presented. Most examples in this thesis are from automotive applications.A driving application for the work presented in this thesis is an automotive emergency braking system. This system is called a collision mitigation by braking (CMbB) system. It aims at mitigating the consequences of an accident by applying the brakes once a collision becomes unavoidable. A CMbB system providing a maximum collision speed reduction of 15 km/h and an average speed reduction of 7.5 km/h is estimated to reduce all injuries, classified as anything between moderate and fatal, for rear-end collisions by 16%. Since rear-end collision correspond to approximately 30% of all accidents this corresponds to a 5% reduction for all accidents.The evaluation includes results from simulations as well as two demonstrator vehicles, with different sensor setups and different decision logic, that perform autonomous emergency braking.
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| 6. |
- Jansson, Jonas, 1973-, et al.
(författare)
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Driver reactions to horn and headlight warnings in critical situations : A simulator study
- 2013
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Ingår i: Proceedings of the 16th International Conference Road Safety on Four Continents. - Linköping : Statens väg- och transportforskningsinstitut.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- This paper presents a driving simulator study on driving behavior in a critical head-on collision scenario. The study aims at providing basic understanding of driver responses to headlight and horn warning coming from another vehicle a time critical situation. In total, 48 participants drove 30 km. During the drive participants performed a secondary task, announced by a vibration in the seat. At the time of the secondary task the own vehicle was directed into the opposing lane where oncoming simulated vehicles issued a light and/or sound warnings to get the drivers attention. An additional purpose of the study was to examine if the warning coming from the other vehicle has a different effect on persons with a hearing loss. A possible application for this type of warnings is the implementation of a system for automatic activation. Systems for automatic activation of brakes and steering are currently entering the market. These systems use proximity sensors to monitor the state of surrounding road users. Depending on the specific situation the effort/possibility to avoid or mitigate an accident may differ significantly between the principle road users of a pending collision, e.g. one road user (1) may easily avoid a collision while another (2) may not be able to do so. The only possibility for the second road user (2) to avoid a collision in such a situation is to issue a warning to the first (1), so that he/she may take evasive actions. Connecting the horn and the headlight to already existing sensor system, for automatic warning activation, is a cost effective means to provide such a warning. The warnings, could of course, also be triggered manually by the driver.The results indicate that a driver who receives a warning from the oncoming vehicle responds faster to avoid the pending frontal collision. The most effective warning was the combination of horn and headlight. A majority of the participants where positive to the notion of an automated system to provide this type of warning (n=41). No significant difference in the behavior between the groups with and without hearing loss was found in this study.
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| 7. |
- Lindström, Jonas, 1977-, et al.
(författare)
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Uppgifter om mäns och kvinnors försörjningsaktiviteter i häradsrättens protokoll, Snevringe (Västmanland), perioden 1720-1880
- 2020
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Annan publikationabstract
- Uppgifter om mäns och kvinnors försörjningsaktiviteter i Snevringe (Västmanland) häradsrätts protokoll har transkriberats och analyserats, och källtext och källtrogna variabler registrerats bokstavstroget, av Jonas Lindström, Benny Jacobsson, Carl Mikael Carlsson, Karin Hassan Jansson, Linnea Henningsson, Maria Ågren, Sarah Vorminder och Örjan Kardell, inom forskningsprojektet Gender and Work.Kvalitetskontroll är utförd av Sofia Ling och Jonas Lindström.Analys av källmaterialet har gjorts av Benny Jacobsson, Carl Mikael Carlsson, Karin Hassan Jansson, Linnea Henningsson, Maria Ågren, Sarah Vorminder, Örjan Kardell inom projektet Gender and Work https://www.uu.se/gawMaterialet är sökbart i databasen GAW - https://gotham.ddb.umu.se/
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| 8. |
- Mishra, A, et al.
(författare)
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Diminishing benefits of urban living for children and adolescents' growth and development
- 2023
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Ingår i: Nature. - : Springer Science and Business Media LLC. - 1476-4687 .- 0028-0836. ; 615:7954, s. 874-883
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Tidskriftsartikel (refereegranskat)abstract
- Optimal growth and development in childhood and adolescence is crucial for lifelong health and well-being1–6. Here we used data from 2,325 population-based studies, with measurements of height and weight from 71 million participants, to report the height and body-mass index (BMI) of children and adolescents aged 5–19 years on the basis of rural and urban place of residence in 200 countries and territories from 1990 to 2020. In 1990, children and adolescents residing in cities were taller than their rural counterparts in all but a few high-income countries. By 2020, the urban height advantage became smaller in most countries, and in many high-income western countries it reversed into a small urban-based disadvantage. The exception was for boys in most countries in sub-Saharan Africa and in some countries in Oceania, south Asia and the region of central Asia, Middle East and north Africa. In these countries, successive cohorts of boys from rural places either did not gain height or possibly became shorter, and hence fell further behind their urban peers. The difference between the age-standardized mean BMI of children in urban and rural areas was <1.1 kg m–2 in the vast majority of countries. Within this small range, BMI increased slightly more in cities than in rural areas, except in south Asia, sub-Saharan Africa and some countries in central and eastern Europe. Our results show that in much of the world, the growth and developmental advantages of living in cities have diminished in the twenty-first century, whereas in much of sub-Saharan Africa they have amplified.
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| 9. |
- Thorslund, Birgitta, 1976-, et al.
(författare)
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Principle Other Vehicle Warning
- 2014
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- The only possibility for a driver to avoid a collision may sometimes be to issue a warning to another driver. Connecting the horn and the headlight to an already existing sensor system could be a cost effective solution. This report covers the implementation and evaluation of such an automated warning system in a driving simulator at VTI. In this test 24 drivers with normal hearing and 24 with moderate hearing loss experienced five critical events in which four different warning signals were evaluated; sound, light, and a combination of sound and light, and no warning (as reference). A visual distraction task was used to distract the drivers and create critical situations. The results were consistent. A combined sound and light warning significantly increased cautious driving behaviour and also lead to the highest perceived criticality of the situations. With the combined warning the driver’s attention was effectively drawn from the visual distraction task. Drivers were generally positive towards the warning system, and most positive towards the combined warning presenting light and sound signals. Drivers were able to distinguish between warnings (at critical events) and greetings (at non-critical events) suggesting that the tested additional use of horn and headlight would not affect reactions to non-critical warnings or greetings. Hearing loss was associated with worse performance on the visual distraction task and less perceived realism of the driving simulator. But it was not associated with effects on any driving behaviour measures or of warning modalities. This result suggests that the evaluated system should work also for drivers with moderate hearing loss.
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| 10. |
- Abbasi, Rasha, et al.
(författare)
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IceCube search for neutrinos from GRB 221009A
- 2023
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Ingår i: Proceedings of 38th International Cosmic Ray Conference (ICRC 2023). - : Sissa Medialab Srl.
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Konferensbidrag (refereegranskat)abstract
- GRB 221009A is the brightest Gamma Ray Burst (GRB) ever observed. The observed extremelyhigh flux of high and very-high-energy photons provide a unique opportunity to probe the predictedneutrino counterpart to the electromagnetic emission. We have used a variety of methods to searchfor neutrinos in coincidence with the GRB over several time windows during the precursor, promptand afterglow phases of the GRB. MeV scale neutrinos are studied using photo-multiplier ratescalers which are normally used to search for galactic core-collapse supernovae neutrinos. GeVneutrinos are searched starting with DeepCore triggers. These events don’t have directionallocalization, but instead can indicate an excess in the rate of events. 10 GeV - 1 TeV and >TeVneutrinos are searched using traditional neutrino point source methods which take into accountthe direction and time of events with DeepCore and the entire IceCube detector respectively. The>TeV results include both a fast-response analysis conducted by IceCube in real-time with timewindows of T0 − 1 to T0 + 2 hours and T0 ± 1 day around the time of GRB 221009A, as well asan offline analysis with 3 new time windows up to a time window of T0 − 1 to T0 + 14 days, thelongest time period we consider. The combination of observations by IceCube covers 9 ordersof magnitude in neutrino energy, from MeV to PeV, placing upper limits across the range forpredicted neutrino emission.
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