| 1. |
- Aad, G., et al.
(författare)
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- 2012
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swepub:Mat__t (refereegranskat)
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| 2. |
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| 3. |
- Aspholm-Hurtig, Marina, et al.
(författare)
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Functional adaptation of BabA, the H. pylori ABO blood group antigen binding adhesin.
- 2004
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Ingår i: Science (New York, N.Y.). - : American Association for the Advancement of Science (AAAS). - 1095-9203 .- 0036-8075. ; 305:5683, s. 519-22
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Tidskriftsartikel (refereegranskat)abstract
- Adherence by Helicobacter pylori increases the risk of gastric disease. Here, we report that more than 95% of strains that bind fucosylated blood group antigen bind A, B, and O antigens (generalists), whereas 60% of adherent South American Amerindian strains bind blood group O antigens best (specialists). This specialization coincides with the unique predominance of blood group O in these Amerindians. Strains differed about 1500-fold in binding affinities, and diversifying selection was evident in babA sequences. We propose that cycles of selection for increased and decreased bacterial adherence contribute to babA diversity and that these cycles have led to gradual replacement of generalist binding by specialist binding in blood group O-dominant human populations.
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| 4. |
- Bor, Martin, et al.
(författare)
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Do LoRa Low-Power Wide-Area Networks Scale?
- 2016
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Ingår i: Proceedings of the 19th ACM International Conference on Modeling, Analysis and Simulation of Wireless and Mobile Systems. - New York, NY, USA : ACM. - 9781450345026 ; , s. 59-67
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Konferensbidrag (refereegranskat)abstract
- New Internet of Things (IoT) technologies such as LongRange (LoRa) are emerging which enable power ecientwireless communication over very long distances. Devicestypically communicate directly to a sink node which removesthe need of constructing and maintaining a complex multi-hop network. Given the fact that a wide area is coveredand that all devices communicate directly to a few sinknodes a large number of nodes have to share the commu-nication medium. LoRa provides for this reason a rangeof communication options (centre frequency, spreading fac-tor, bandwidth, coding rates) from which a transmitter canchoose. Many combination settings are orthogonal and pro-vide simultaneous collision free communications. Neverthe-less, there is a limit regarding the number of transmitters aLoRa system can support. In this paper we investigate thecapacity limits of LoRa networks. Using experiments wedevelop models describing LoRa communication behaviour.We use these models to parameterise a LoRa simulation tostudy scalability. Our experiments show that a typical smartcity deployment can support 120 nodes per 3.8 ha, which isnot sucient for future IoT deployments. LoRa networkscan scale quite well, however, if they use dynamic commu-nication parameter selection and/or multiple sinks.
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| 5. |
- Voigt, Thiemo, et al.
(författare)
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Mitigating Inter-network Interference in LoRa Networks
- 2017
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Konferensbidrag (refereegranskat)abstract
- Long Range (LoRa) is a popular technology used to constructLow-Power Wide-Area Networks (LPWAN). Giventhe popularity of LoRa it is likely that multiple independentLoRa networks are deployed in close proximity. In this situation,neighbouring networks interfere and methods have tobe found to combat this interference. In this paper we investigatethe use of directional antennae and the use of multiplebase stations as methods of dealing with inter-network interference.Directional antennae increase signal strength atreceivers without increasing transmission energy cost. Thus,the probability of successfully decoding the message in aninterference situation is improved. Multiple base stationscan alternatively be used to improve the probability of receivinga message in a noisy environment. We compare theeffectiveness of these two approaches via simulation. Ourfindings show that both methods are able to improve LoRanetwork performance in interference settings. However, theresults show that the use of multiple base stations clearly outperformsthe use of directional antennae. For example, in asetting where data is collected from 600 nodes which are interferedby four networks with 600 nodes each, using threebase stations improves the Data Extraction Rate (DER) from0.24 to 0.56 while the use of directional antennae providesan increase to only 0.32.
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