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- Brahneborg, Daniel, 1970-, et al.
(författare)
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GeoRep-Resilient Storage for Wide Area Networks
- 2022
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Ingår i: IEEE Access. - : Institute of Electrical and Electronics Engineers (IEEE). - 2169-3536. ; 10, s. 75772-75788
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Tidskriftsartikel (refereegranskat)abstract
- Embedded systems typically have limited processing and storage capabilities, and may only intermittently be powered on. After sending data from its sensors upstream, the system must therefore be able to trust that the data, once acknowledged, is not lost. The purpose of this work is to propose a novel solution for replicating data between the upstream nodes in such systems, with a minimal effect on the software architecture. On the assumption that there is no relative order between replicated data tuples, we designed a new replication protocol based on partial replication. Our protocol uses only 2 communication steps per data tuple, instead of the 3 to 12 used by other solutions. We verified its failover mechanism in a proof-of-concept implementation of the protocol using simulated network failures, and evaluated the implementation on throughput and latency in several controlled experiments using up to 7 nodes in up to 5 geographically separated areas, with up to 1000 data producers per node. The recorded system throughput increased linearly relative to both the number of nodes and the number of data producers. For comparison, Paxos showed a performance similar to our protocol when using 3 nodes, but got slower as more nodes were added. The lack of a relative order, in combination with partial replication, enables our system to continue working during network partitions, not only in the part containing the majority of the nodes, but also in any sufficiently large minority partitions.
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- Easterling, K. E., et al.
(författare)
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Metallurgical case studies for engineering students
- 1973
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Ingår i: Metals and Materials. - 0026-0940. ; 7:10, s. 452-454
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Tidskriftsartikel (refereegranskat)abstract
- The course described attempts to help engineering students adapt themselves to solving problems typically encountered in the metals industries
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- Ort, Christoph, et al.
(författare)
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Spatial differences and temporal changes in illicit drug use in Europe quantified by wastewater analysis
- 2014
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Ingår i: Addiction. - : Wiley. - 0965-2140 .- 1360-0443. ; 109:8, s. 1338-1352
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Tidskriftsartikel (refereegranskat)abstract
- Aims To perform wastewater analyses to assess spatial differences and temporal changes of illicit drug use in a large European population. Design Analyses of raw wastewater over a 1-week period in 2012 and 2013. Setting and Participants Catchment areas of wastewater treatment plants (WWTPs) across Europe, as follows: 2012: 25 WWTPs in 11 countries (23 cities, total population 11.50 million); 2013: 47 WWTPs in 21 countries (42 cities, total population 24.74 million). Measurements Excretion products of five illicit drugs (cocaine, amphetamine, ecstasy, methamphetamine, cannabis) were quantified in wastewater samples using methods based on liquid chromatography coupled to mass spectrometry. Findings Spatial differences were assessed and confirmed to vary greatly across European metropolitan areas. In general, results were in agreement with traditional surveillance data, where available. While temporal changes were substantial in individual cities and years (P ranging from insignificant to <10(-3)), overall means were relatively stable. The overall mean of methamphetamine was an exception (apparent decline in 2012), as it was influenced mainly by four cities. Conclusions Wastewater analysis performed across Europe provides complementary evidence on illicit drug consumption and generally concurs with traditional surveillance data. Wastewater analysis can measure total illicit drug use more quickly and regularly than is the current norm for national surveys, and creates estimates where such data does not exist.
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- Scarpa, Simone, 1976-
(författare)
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La riforma delle politiche per gli anziani non autosufficienti in Italia e in Svezia : un caso di asimmetria apparente?
- 2006
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Ingår i: Stato e Mercato. - Bologna (Italien) : Societa Editrice Il Mulino. - 0392-9701. ; :3, s. 473-508
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Tidskriftsartikel (refereegranskat)abstract
- Last years' reforms affected in an extremely different way the Swedish and the Italian elderly care systems, even if these reforms had been apparently inspired by the same "watchwords". In the article the comparison of the effects of these reforms assumes a "broad" definition of care: the reciprocal interrelations between market, state and family are underlined together with their transformations caused by the introduction of the recent reforms. In the 90s the Italian and the Swedish welfare state experienced a further step towards the decentralization of responsibilities on elderly care: in both countries responsibilities for the provision of home care services have been transferred to the municipalities. In the same time, both countries experienced a trend towards the marketization and the informalization of elderly care with a growing importance of private and non profit providers and of family solidarities. However, even after the introduction of these reforms, a substantial confirmation of the differences between the "family ideologies" that historically distinguished the Swedish and Italian welfare states can still be found rather than an evidence of a convergence of their elderly care systems.
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