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- Eriksson, Peter, 1992-
(författare)
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Från volontärorganisation till politisk rörelse : En studie av flyktingorganisationers arbete under hösten 2015
- 2021
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Ingår i: Identitet i en föränderlig värld. - Malmö : Malmö universitet. - 9789178771721 ; , s. 53-82
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- In 2017, social scientists Ilker Ataç and Sara de Jong described the emergence of a new type of movement in Europe following the 2015 refugee crisis. According to the authors, these ‘new refugee aid movements’ are characterised by the way in which they combine humanitarian and political work with refugees. This combination sets them apart from conventional humanitarian NGOs (e.g. Caritas and the Red Cross) and social movements (e.g. the people’s campaign against nuclear power).This study examines if two Swedish organisations, Refugees Welcome to Malmö and Kontrapunkt, can be understood as part of this European trend. It is based on a thematical reading (following Hunt, Benford and Snow’s theory of social movement identity) of previously conducted interviews with movement volunteers. The main result of this study is that the investigated organisations share several features with the new type of movement. These shared features include a flexible way of working with refugees and the belief in the need for a political solution to the humanitarian crisis. Still, smaller differences are also identified. Refugees Welcome to Malmö, for example, chose to co-operate with local authorities, setting them apart from the European trend where the new movements often pursue autonomy from public authorities. Ultimately, this study calls for further investigation into an important period of modern Swedish migration history.
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- Ge, Yu, 1995, et al.
(författare)
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Experimental Validation of Single Base Station 5G mm Wave Positioning: Initial Findings
- 2022
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Ingår i: 2022 25th International Conference on Information Fusion, FUSION 2022. - Piscataway : IEEE.
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Konferensbidrag (refereegranskat)abstract
- 5G cellular networks can utilize millimeter wave signals, and support large bandwidths and large antenna arrays, which provide more geometric-based signals and higher delay and angle resolutions. These merits bring new opportunities in positioning the user with limited infrastructure through the use of combined angle and delay information. However, there are many practical challenges to overcome, in order to have a functioning single base station 5G mmWave positioning system. In this paper, we describe a deployed single base station mmWave positioning system, and provide an example of the measurement data. Furthermore, we perform measurement validation on a limited measurement data set by performing base station localization. Additional evaluations performed on simulation model data provide guidelines on the required size of the data set and receiver antenna configuration, which will be implemented in upcoming measurements.
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| 4. |
- Ge, Yu, 1995, et al.
(författare)
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Experimental Validation of Single BS 5G mmWave Positioning and Mapping for Intelligent Transport
- 2024
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Ingår i: IEEE Transactions on Vehicular Technology. - 0018-9545 .- 1939-9359. ; In Press
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Tidskriftsartikel (refereegranskat)abstract
- Positioning with 5G signals generally requires connection to several base stations (BSs), which makes positioning more demanding in terms of infrastructure than communications. To address this issue, there have been several theoretical studies on single BS positioning, leveraging high-resolution angle and delay estimation and multipath exploitation possibilities at mmWave frequencies. This paper presents the first realistic experimental validation of such studies, involving a commercial 5G mmWave BS with a customized beam sweep procedure and a user equipment (UE) development kit mounted on a test vehicle. We present the relevant signal models, and signal processing methods, and validate these based on data collected in an outdoor science park environment. Our results indicate that positioning is possible, but the performance is limited by the knowledge of the position and orientation of the infrastructure and the multipath visibility and diversity
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| 5. |
- Grieco, Francesco, 1992, et al.
(författare)
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Recovery and validation of Odin/SMR long-term measurements of mesospheric carbon monoxide
- 2020
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Ingår i: Atmospheric Measurement Techniques. - : Copernicus GmbH. - 1867-1381 .- 1867-8548. ; 13:9, s. 5013-5031
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Tidskriftsartikel (refereegranskat)abstract
- The Sub-Millimetre Radiometer (SMR) on board the Odin satellite performs limb sounding measurements of the middle atmosphere to detect molecular emission from different species. Carbon monoxide (CO) is an important tracer of atmospheric dynamics at these altitudes, due to its long photochemical lifetime and high vertical concentration gradient. In this study, we have successfully recovered over 18 years of SMR observations, providing the only dataset to date being so extended in time and stretching out to the polar regions, with regards to satellite-measured mesospheric CO. This new dataset is part of the Odin/SMR version 3.0 level 2 data. Much of the level 1 dataset - except the October 2003 to October 2004 period - was affected by a malfunctioning of the phase-lock loop (PLL) in the front end used for CO observations. Because of this technical issue, the CO line could be shifted away from its normal frequency location, causing the retrieval to fail or leading to an incorrect estimation of the CO concentration. An algorithm was developed to locate the CO line and shift it to its correct location. Nevertheless, another artefact causing an underestimation of the concentration, i.e. a line broadening, stemmed from the PLL malfunctioning. This was accounted for by using a broader response function. The application of these corrections resulted in the recovery of a large amount of data that was previously being flagged as problematic and therefore not processed. A validation study has been carried out, showing how SMR CO volume mixing ratios are in general in good accordance with the other instruments considered in the study. Overall, the agreement is very good between 60 and 80 km altitude, with relative differences close to zero. A positive bias at low altitudes (50-60 km) up to +20% and a negative bias up to -20% at high altitudes (80-100 km) were found with respect to the comparison instruments.
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