1. |
- Borg, Markus, et al.
(författare)
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Ergo, SMIRK is safe : a safety case for a machine learning component in a pedestrian automatic emergency brake system
- 2023
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Ingår i: Software quality journal. - : Springer. - 0963-9314 .- 1573-1367. ; 31:2, s. 335-
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Tidskriftsartikel (refereegranskat)abstract
- Integration of machine learning (ML) components in critical applications introduces novel challenges for software certification and verification. New safety standards and technical guidelines are under development to support the safety of ML-based systems, e.g., ISO 21448 SOTIF for the automotive domain and the Assurance of Machine Learning for use in Autonomous Systems (AMLAS) framework. SOTIF and AMLAS provide high-level guidance but the details must be chiseled out for each specific case. We initiated a research project with the goal to demonstrate a complete safety case for an ML component in an open automotive system. This paper reports results from an industry-academia collaboration on safety assurance of SMIRK, an ML-based pedestrian automatic emergency braking demonstrator running in an industry-grade simulator. We demonstrate an application of AMLAS on SMIRK for a minimalistic operational design domain, i.e., we share a complete safety case for its integrated ML-based component. Finally, we report lessons learned and provide both SMIRK and the safety case under an open-source license for the research community to reuse. © 2023, The Author(s).
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3. |
- Borg, Markus, et al.
(författare)
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Exploring the Assessment List for Trustworthy AI in the Context of Advanced Driver-Assistance Systems
- 2021
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Ingår i: 2021 IEEE/ACM 2nd International Workshop on Ethics in Software Engineering Research and Practice (SEthics). ; , s. 5-12
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Konferensbidrag (refereegranskat)abstract
- Artificial Intelligence (AI) is increasingly used in critical applications. Thus, the need for dependable AI systems is rapidly growing. In 2018, the European Commission appointed experts to a High-Level Expert Group on AI (AI-HLEG). AI- HLEG defined Trustworthy AI as 1) lawful, 2) ethical, and 3) robust and specified seven corresponding key requirements. To help development organizations, AI-HLEG recently published the Assessment List for Trustworthy AI (ALTAI). We present an illustrative case study from applying ALTAI to an ongoing development project of an Advanced Driver-Assistance System (ADAS) that relies on Machine Learning (ML). Our experience shows that ALTAI is largely applicable to ADAS development, but specific parts related to human agency and transparency can be disregarded. Moreover, bigger questions related to societal and environmental impact cannot be tackled by an ADAS supplier in isolation. We present how we plan to develop the ADAS to ensure ALTAI-compliance. Finally, we provide three recommendations for the next revision of ALTAI, i.e., life-cycle variants, domainspecific adaptations, and removed redundancy.
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4. |
- Ebenhard, Torbjörn, et al.
(författare)
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Lågskogsbruk – biobränsleproduktion i samklang med miljömål
- 2013
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Lågskogsbruk går ut på att återkommande hugga lövträd som slår skott från en gemensam stubb-bas eller sockel. Lågskogens två huvudtyper, skottskogar och hamlingsskogar, kan ses som halvnaturliga biotoper med lång historia och egna utvecklade organismsamhällen, däribland många naturvårdsintressanta arter, som ursprungligen levde i naturliga biotoper som inte längre existerar. Lågskogen erbjuder gamla strukturer och substrat utan att miljön blir kontinuerligt skuggig som i högskog. Det är både möjligt och önskvärt att bedriva ett modernt lågskogsbruk för biomassaproduktion, i synnerhet på marker som idag inte används för skogsbruk eller jordbruksproduktion. Vi bedömer att det finns totalt ca en halv miljon hektar av skyddade områden, restmarker i jordbrukslandskapet, ängs- och hagmarker, väg- och järnvägsområden, kraftledningsgator, samt tätortsnära parker och friluftsområden där lågskogsbruk skulle vara lämpligt. Med en produktion av 2-5 ton biomassa per hektar och år skulle detta kunna ge 10-24 MWh energi per hektar och år, sammanlagt för landet 5-12 TWh per år. Jämfört med de bästa biomassagrödorna (Salix, Miscanthus) har lågskogen inte samma potential som bränsleproducent, men den står sig väl mot raps. Lågskogen är dock mer effektiv än vanliga biomassagrödor med avseende på utsläpp av växthusgaser per producerad energienhet, snabbheten i återinlagring av kol, och gynnandet av biologisk mångfald.
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- Helldin, Jan Olof, et al.
(författare)
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Abundance of red-listed species in infrastructure habitats - "responsibility species" as a priority-setting tool for transportation agencies' conservation action
- 2015
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Ingår i: Nature Conservation. - : Pensoft Publishers. - 1314-6947 .- 1314-3301. ; , s. 143-158
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Tidskriftsartikel (refereegranskat)abstract
- Road and railroad verges may contribute to nature conservation by providing habitat for many species, but due to limited resources, there is a need to select the most important road and railroad stretches for adapted management. We explore the responsibility species concept as a tool for the Swedish Transport Administration to make this selection. We propose lists of candidate responsibility species based on relative abundance of conservation priority species in the vicinity of roads and railroads, respectively. Abundance data were derived from crowd-sourced species observations. Species with >= 20% of observations in infrastructure habitats were included as candidate responsibility species. For roads 32 species were included in the list, for railroads seven species, with an overlap of three species between the lists. We analyzed habitat and management requirements of the listed species to try identifying functional groups. Most of the species require open or semi-open habitats, mainly dry grassland or heathland on sandy or limy soil, un-sprayed crop fields, or solitary trees. Host plants or substrates include broom (genus Genista), patches of bare soil, and sun exposed wood. Conservation actions prescribed for the species include, e.g., late or irregular mowing, removal of the field layer, planting of host species, protecting and providing particular substrates, and special protection of certain sites. We argue that road and railroad managers are particularly well suited to conduct most of these actions. We consider the responsibility species concept to be a useful tool for transportation agencies to set priorities for adapted verge management, and the current method to be effective in identifying a first list of candidate species. We discuss the possibility of also identifying responsibility habitats or general management measures based on the results.
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6. |
- Helldin, Jan Olof, et al.
(författare)
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Biodiversitet i jernbanehabitater – biologisk kulturarv og grøn infrastruktur
- 2019
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Ingår i: Jernbanehistorie. - 2245-9499 .- 2446-323X. ; 7, s. 7-35
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Tidskriftsartikel (refereegranskat)abstract
- The railway network with associated train traffic has a number of well described negative effects on biodiversity, for example loss of natural habitat, barrier and mortality effects, noise disturbance, changes in hydrology, and an increasing fragmentation. However, railway areas such as rail yards, embankments and verges may also provide habitat for many plant and animal species, some of which are rare and endangered while others are invasive aliens. The importance of railway habitats for plant and animal conservation has been acknowledged rather recently, and there are yet much to learn about the ecology of these areas, including their history, ecological functions, and the threats to, prospects for, and management of species of particular importance. The aim of this article is to give an overview of the diversity of species and habitats in Swedish railway areas, suggest a conceptual theory of how these species link to the pre-industrial landscape, describe current goals for and management of railway habitats, and point out the need for future research in the field.Many railway areas in Sweden are characterized by a small-scale habitat mosaic, including micro niches, where species of plants, insects and other invertebrates thrive. Sandy soils and regular vegetation management create dry and sun-exposed “mini steppes” favoring low-growth plants and specialized insects that otherwise have problems surviving in the modern landscape. Frequent disturbances to the ground and soil, caused by a range of human activities, result in ruderal habitats, not least in stations and rail yards where vegetation can be found in various early successional stages. Stands of flowering plants such as blueweed, bluebells, legumes and hawkweeds constitute nectar and pollen resources and host plants for a range of beetles, bees, bugs and butterflies. Patches of bare soil create habitat for nest digging bees and groundliving carabid beetles. Objects such as solitary trees or rose shrubs, stone walls, older wood constructions and wood piles provide substrate for many lichen and insect species and may therefore also be of conservation value. Seeds and invertebrates dispersing along railway verges and hitch-hiking with vehicles further contribute to the variety of species.During assessments of species (selected taxa) and habitats in 747 Swedish rail yards and stations in 2008-2018, a total of ca 2,700 species were recorded, of which 123 species are red-listed. Some 40% of the recorded species could be labelled railway associated, meaning that they significantly benefit from and contribute to the railway habitats, but are also found in similar habitats elsewhere in the landscape. Some 3% of the species are railway bound, meaning that they depend on railway habitats and are largely lacking in other areas. A total of 237 of the rail yards and stations were classified as species rich, i.e. with records of species of particular importance or with the right conditions for such species. This classification can serve to point out railway areas for special conservation action.Species favored by dry and warm conditions (referred to as xerotermophilic) can be assumed to have evolved in natural steppe or ruderal grassland. Such species found new niches and spread to new areas in the historical agricultural landscape. In Sweden before industrialization, the agricultural landscape was dominated by grasslands required to feed large stocks of domestic animals, many forests were sparse and semi-open, soils were emaciated, and frequent human and livestock activities in the landscape such as trampling, digging, cutting etc. mimicked natural disturbance regimes. With the industrialization, in the late 19th and early 20th century, the landscape started undergoing large changes and the conditions diminished for the many species linked to open, dry grasslands. However, in the same period the national railway network was established, and many of the species found recourse in railway areas, which again provided conditions resembling natural habitats and ecological processes. The railway network reached through a landscape of grasslands, villages and farms, and species could easily spread into their new habitats. While sparse and sometimes declining, the xerothermophilic species and the sandy, ruderal grasslands found in railway areas could be considered a biological heritage from the pre-industrial landscape. Still today the railway verges may serve as ecological corridors that functionally connect remnant habitats. Railway areas provide a combination of ancient and new conditions for biodiversity and may form an ecological bridge in both time and space -- thereby being part of the landscape´s green infrastructure.The Swedish Transport Administration, the authority in charge of the management of railway areas, currently acknowledges the significance of species conservation in railway habitats, and state in their regulatory documents that species rich railway habitats should be maintained and if possible created, in order to strengthen the green infrastructure and to avoid habitat loss. Efforts are made to adapt the current railway maintenance, to build knowledge, and enable research and experimental management, to reach this goal.Possible adaptations of regular vegetation maintenance in railway areas may include i) postponed vegetation cutting, ii) cutting targeted to certain areas, iii) control of alien invasive species, iv) removal of cutting mulch, v) controlled burning and iv) livestock grazing. Other examples of management actions to benefit species conservation in railway areas are i) ground scarification, ii) providing open sand, iii) uprooting of woody shrub, iv) seeding with desired species such as host plants or nectar and pollen plants for insects. Also regional railway managers, as well as nature conservation authorities and NGOs, should take part in this endeavor, to help prioritizing the efforts and set them in relation to conservation efforts in the surrounding landscape.The toolbox for railway habitat management needs development. Any adapted management measures should be carefully monitored, in order to build knowledge about their conservation potential and their cost-effectiveness. We also need a better general understanding of the ecology of railway habitats and of the threats to their conservation. However, already the current level of knowledge vouch for immediate action, at selected sites in the existing railway network and in all railway (re-)construction projects.
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7. |
- Helldin, Jan Olof, et al.
(författare)
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Så har blomsterlupin spridit sig i Mellansverige
- 2022
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Ingår i: Svensk Botanisk Tidskrift. - 0039-646X. ; 116, s. 112-119
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Tidskriftsartikel (refereegranskat)abstract
- Garden lupin Lupinus polyphyllus is one of the most problematic invasive alien plant species in Sweden. It is particularly common in road verges where they may threaten biodiversity. We present the results from a study of the distribution of garden lupins in the road network in a 130 km2 area in south central Sweden, following a new census method intended to function as a standard for the Swedish Transport Administration. The complete road network in the area was censused (192 km), from highway to minor forest roads. Lupin stands were found in ~4 percent of major roads and ~2 percent of minor, private roads; yet most lupin stands were found in the minor roads because minor roads are more abundant. A majority of lupin stands (76%) were concentrated around houses with gardens, indicating gardens as the primary source for lupins in the area. The authors propose a strategy for lupin control depending on density: large, dense stands are contained, small stands are eradicated, only lupin free soil is used in road management and local actors are informed in order to prevent further spread.
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8. |
- Lennartsson, Finn, et al.
(författare)
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Advanced fiber tracking in early acquired brain injury causing cerebral palsy
- 2015
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Ingår i: American Journal of Neuroradiology. - : HighWire Press. - 0195-6108 .- 1936-959X. ; 36:1, s. 181-187
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND AND PURPOSE: Diffusion-weighted MR imaging and fiber tractography can be used to investigate alterations in white matter tracts in patients with early acquired brain lesions and cerebral palsy. Most existing studies have used diffusion tensor tractography, which is limited in areas of complex fiber structures or pathologic processes. We explored a combined normalization and probabilistic fiber-tracking method for more realistic fiber tractography in this patient group.MATERIALS AND METHODS: This cross-sectional study included 17 children with unilateral cerebral palsy and 24 typically developing controls. DWI data were collected at 1.5T (45 directions, b=1000 s/mm(2)). Regions of interest were defined on a study-specific fractional anisotropy template and mapped onto subjects for fiber tracking. Probabilistic fiber tracking of the corticospinal tract and thalamic projections to the somatosensory cortex was performed by using constrained spherical deconvolution. Tracts were qualitatively assessed, and DTI parameters were extracted close to and distant from lesions and compared between groups.RESULTS: The corticospinal tract and thalamic projections to the somatosensory cortex were realistically reconstructed in both groups. Structural changes to tracts were seen in the cerebral palsy group and included splits, dislocations, compaction of the tracts, or failure to delineate the tract and were associated with underlying pathology seen on conventional MR imaging. Comparisons of DTI parameters indicated primary and secondary neurodegeneration along the corticospinal tract. Corticospinal tract and thalamic projections to the somatosensory cortex showed dissimilarities in both structural changes and DTI parameters.CONCLUSIONS: Our proposed method offers a sensitive means to explore alterations in WM tracts to further understand pathophysiologic changes following early acquired brain injury.
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9. |
- Lundén, Tomas, et al.
(författare)
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Öppen vetenskap vid SLU – en förstudie
- 2019
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Under 2018 har SLU-biblioteket arbetat med en förstudie kring öppen vetenskap. Målet har varit att ta fram ett underlag i form av en rapport till SLU:s ledning som kan användas för att skapa en gemensam målbild för öppen vetenskap vid SLU, samt genom rekommendationer ge förslag på tänkbara insatsområden och aktiviteter. Förstudien innehåller tre delar: en omvärldsorientering, en beskrivning av SLU i syfte att lyfta fram potential för ett tydligare arbete med öppen vetenskap, samt intervjuer med åtta SLU-forskare.
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10. |
- Mandalenakis, Zacharias, 1979, et al.
(författare)
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The incidence of atrial fibrillation and the added value of thumb ECG for detecting new cases.
- 2018
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Ingår i: Scandinavian cardiovascular journal : SCJ. - : Informa UK Limited. - 1651-2006 .- 1401-7431. ; 52:5, s. 256-251
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Tidskriftsartikel (refereegranskat)abstract
- To evaluate the incidence of atrial fibrillation (AF) as well as the value of thumb electrocardiography (ECG) for identification of paroxysmal AF in a Swedish cohort of middle-aged men from the general population.A population based random cohort of 798 men underwent screening at the age of 50 and re-examined at the age of 60 and 71 years. At the last examination, a thumb ECG recording was conducted for 2 weeks twice a day in 479 men from the original cohort. Registered hospital AF diagnoses were retrieved from the Swedish Patient Registry from 1993 to 2014.During a 21-year follow-up, 77 men (9.6%) were diagnosed with AF; of these men, 49.4% (38 of 77) had permanent AF. Fifteen of 479 (3.1%) patients had paroxysmal AF. Of those, seven had been previously diagnosed with paroxysmal AF through Patient Registry. The incidence of AF increased from 2.2 per 1000 years at risk at the age of 50-54 years to 9.3 per 1000 years at risk at the age 65-70 years. The prevalence of AF at the age of 71 years was increased from 7.1% to 9.9% using thumb ECG.In addition to medical history, patient register and 12-lead -ECG, the use of thumb ECG increased the number of detected paroxysmal AF by 21%.
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