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Age of information : foundations and applications
- 2023
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Samlingsverk (redaktörskap) (övrigt vetenskapligt/konstnärligt)abstract
- At the forefront of cutting-edge technologies, this text provides a comprehensive treatment of a crucial network performance metric, ushering in new opportunities for rethinking the whole design of communication systems. Detailed exposition of the communication and network theoretic foundations of Age of Information (AoI) gives the reader a solid background, and discussion of the implications on signal processing and control theory shed light on the important potential of recent research. The text includes extensive real-world applications of this vital metric, including caching, the Internet of Things (IoT), and energy harvesting networks. The far-reaching applications of AoI include networked monitoring systems, cyber-physical systems such as the IoT, and information-oriented systems and data analytics applications ranging from the stock market to social networks. The future of this exciting subject in 5G communication systems and beyond make this a vital resource for graduate students, researchers and professionals.
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- Li, Lili, et al.
(författare)
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Recent introductions, ancient recolonization events and local adaptation: a first fine-scale mapping of the population genetic structure of Norway spruce across Sweden
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Population genetic structure matters for a large range of issues: it is intrinsically related to speciation and local adaptation, it informs us on past demography, it conditions the response of populations to climate change or to the spread of diseases and it severely limits the power of genome wide association studies (GWAS). In the present study we genotyped all individuals from the base population of the Swedish P. abies breeding program using exome capture. In total 4769 individuals were genotyped. This very large and dense sampling along a latitudinal gradient ranging from 55°N to 67°N, together with a large number of polymorphisms (>300,000 SNPs) allowed us to analyze population genetic structure at an unprecedented scale and to test for associations between genetic polymorphisms and environmental variables We used clustering methods (PCA, Admixture) to obtain a first genetic clustering of the data. Moreover, in order to better capture the mixture of discrete and continuous processes that generated the distribution of the genetic variation of Norway spruce across Sweden two recently developed spatialized analyses (conStruct, EEMS) were also performed. The overall data comprises both trees of Swedish origin and a large number of trees recently introduced into Sweden from the rest of the range and is highly structured with a total of six clusters representing the main postglacial refugia and admixed populations originating from the refugia. Focusing on the trees of Swedish origin, the data shows that those can be divided into two main clusters with a contact zone in central Sweden and a third small cluster in northern Sweden. The contact zone is also observed in other species and likely reflects the meeting point of the two main waves of recolonization of Scandinavia after the Last Glacial Maximum. As to the northernmost cluster it was characterized by a high contribution from P. obovata. A large number of SNPs were found to be associated to environmental variables and exhibited a stronger pattern of isolation-by-distance than random SNP. Considering that P. abies has been in Sweden for less than 50 generations, this suggests a strong selection pressure during the expansion of the species through Scandinavia.
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- Zhou, Bo
(författare)
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Advanced Laser-based Multi-scalar Imaging for Flame Structure Visualization towards a Deepened Understanding of Premixed Turbulent Combustion
- 2015
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The work presented in the thesis concerns the developments of laser-based diagnostics and its application to the study of turbulent premixed combustion. The diagnostic developments, mainly concerned with planar laser-induced fluorescence (PLIF), are intended to provide instantaneous visualization of the key species originating from the combustion processes involved in the burning of hydrocarbons and nitrogen-containing fuels under turbulent conditions. For the burning of hydrocarbons, these species include HCO, hot O2 etc. and for the burning of nitrogen-containing fuels, these include NH3, NH and CN. In connection with this, the potential for instantaneous temperature mapping using two-line atomic LIF (TLIF) with a novel seeding system are also demonstrated. The study of turbulent premixed combustion involves simultaneous imaging of such scalars as HCO, CH, CH2O and OH as well as temperature. Laboratory-scale premixed CH4/air flames stabilized on the Lund University Pilot Jet burner (LUPJ) and the Low-Swirl Burner (LSB) were investigated over a wide operational range and various combustion regimes. The results from both the LUPJ and the LSB flames provide the first experimental evidences for its being possible to appreciably broaden the reaction zone of premixed flames can be significantly broadened through rapid turbulence mixing, the results being verified by observations of broadened/distributed short-lived radicals, HCO and/or CH. The observations obtained for the two clearly different burner configurations suggest that distributed reactions can be a common combustion mode. For the LUPJ flames, the dependence of the reaction zone broadening on the jet speed and the equivalent ratio was investigated systematically. Spatial correlations between the scalars that were measured were investigated, and the detailed local flame structures with and without the presence of distributed reactions were analyzed and compared. It was found that having a temperature above ~ 1000 K is important for sustaining the distributed reactions. The build-up of radical pools through rapid turbulence transport in regions containing (intermediate) reactants was found to be responsible for the distributed reactions occurring. In addition, a study of Mild combustion that has similarities with the distributed reaction concept was performed using optical diagnostics. Certain insights concerning the reaction zone structure of Mild combustion are discussed.
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