Analysis of Facebook content demand patterns

Data volumes in communication networks increase rapidly. Further, usage of social network applications is very wide spread among users, and among these applications, Facebook is the most popular. In this paper, we analyse user demands patterns and content popularity of Facebook generated traffic. The data comes from residential users in two metropolitan access networks in Sweden, and we analyse more than 17 million images downloaded by almost 16,000 Facebook users. We show that the distributions of image popularity and user activity may be described by Zipf distributions which is favourable for many types of caching. We also show that Facebook activity is more evenly spread over the day, compared to more defined peak hours of general Internet usage. Looking at content life time, we show that profile pictures have a relatively constant popularity while for other images there is an initial, short peak of demand, followed by a longer period of significantly lower and quite stable demand. These findings are useful for designing network and QoE optimisation solutions, such as predictive pre-fetching, proxy caching and delay tolerant networking

Does climate change transform military medicine and defense medical support?

BackgroundClimate change has effects on multiple aspects of human life, such as access to food and water, expansion of endemic diseases as well as an increase of natural disasters and related diseases. The objective of this review is to summarize the current knowledge on climate change effects on military occupational health, military healthcare in a deployed setting, and defense medical logistics.MethodsOnline databases and registers were searched on August 22nd, 2022 and 348 papers retrieved, published between 2000 and 2022, from which we selected 8 publications that described climate effects on military health. Papers were clustered according to a modified theoretical framework for climate change effects on health, and relevant items from each paper were summarized.ResultsDuring the last decades a growing body of climate change related publications was identified, which report that climate change has a significant impact on human physiology, mental health, water- and vector borne infectious diseases, as well as air pollution. However, regarding the specific climate effects on military health the level of evidence is low. The effects on defense medical logistics include vulnerabilities in the cold supply chain, in medical devices functioning, in need for air conditioning, and in fresh water supply.ConclusionsClimate change may transform both the theoretical framework and practical implementations in military medicine and military healthcare systems. There are significant knowledge gaps on climate change effects on the health of military personnel in operations of both combat and non-combat nature, alerting the need for prevention and mitigation of climate-related health issues. Further research within the fields of disaster and military medicine is needed to explore this novel field. As climate effects on humans and the medical supply chain may degrade military capability, significant investments in military medical research and development are needed

A Swedish comment on ‘review: the availability of life-cycle studies in Sweden’

The article entitled ‘Review: the availability of life-cycle studies in Sweden’ by Croft and colleagues (January 2019, volume 24, issue 1, pages 6–11) has puzzled many researchers in Sweden. The stated purpose of the article is to review the availability of water and carbon footprinting studies and life-cycle assessment (LCA) studies in Sweden. Despite its title and purpose suggesting otherwise, the article appears to be about the accessibility of life-cycle case studies from Sweden in South Africa. It is problematic that the article claims to be a review in the title and text, but is presented by the journal as a commentary. We believe that the article’s method is unclear and that its title and results are misleading. The authors of the article found only 12 academic papers, 10 academic theses, 8 company reports, and 1 presentation. This result significantly underestimates the actual production and availability of Swedish LCA case studies

The impact of the reporting requirement on sustainability reporting : A comparison between four different industries

Bakgrund och problemdiskussion: Hållbarhet har blivit ett växande samtalsämne och ett ökat tryck på hållbarhet har lett till att ett lagkrav har tillsatts för att företag ska redovisa hållbarhet i årsredovisningen. Bland annat har GRI tagit fram riktlinjer för en tydlig struktur för hållbarhetsredovisningen men problemet är att företaget jobbar med olika intressenter och använder sig av olika indikatorer vid redovisningen vilket i sin tur gör det svårt att jämföra olika hållbarhetsredovisningar med varandra. Syfte och frågeställning: Syftet med denna studie är att undersöka vad svenska börsnoterade företag presenterar i sina hållbarhetsrapporteringar. Vidare är syftet att bidra till en ökad förståelse kring hur olika företags hållbarhetsrapportering skiljer sig åt innehållsmässigt både över tid och mellan branscher. Studiens svarar bland annat på frågeställningen om kring hur innehållet i hållbarhetsrapporterna har förändrats mellan 2015 och 2020. Metod: För att besvara studiens frågeställning genomförs en kvantitativ innehållsanalys på totalt tjugo olika företags hållbarhetsrapporteringar. I studien valdes granskning av börsnoterade företag från fyra olika branscher, totalt fem företag från varje bransch. För innehållsanalysen används ett kodningsschema som skapats utifrån kategorierna ekonomiskt, miljömässigt och socialt. Kategorierna är tagna från Triple Bottom Line. Analysen genomförs som en kvantitativ analys enligt ordmetoden och observerar samt markerar begrepp och ord som kan kopplas till kategorierna i kodningsschemat. I studien undersöks även ifall det finns någon statistiskt signifikant korrelation mellan antalet sidor som företagen presenterar och antalet observationer som gjorts. Empiri och slutsats: Resultatet från studien tyder på att företagens fokus i redovisningen har skiftat från social hållbarhet 2015 till att den miljömässiga hållbarheten istället är den kategori som presenteras mest frekvent 2020. Innehållsmässigt i företagens redovisning är det i princip samma begrepp som används de båda åren. Det är endast inom den miljömässiga kategorin som nya begrepp eller att vissa miljömässiga delar har blivit ett större avsnitt i företagens rapportering. Från studien är den största skillnaden mellan åren omfattningen av företagens redovisning, antalet observationer och sidor ökade från 2015 till 2020. Korrelationen mellan variablerna visar även statistisk signifikans. Background and problem discussion: Sustainability has become a growing topic of discussion and an increased pressure on sustainability has led to a legal requirement being added for companies to report sustainability in the annual report. Among other things, GRI has developed guidelines for a clear structure for sustainability reporting, but the problem is that the company works with different stakeholders and uses different indicators in the reporting, which in turn makes it difficult to compare different sustainability reports with each other.     Purpose and question: The purpose of this study is to investigate what Swedish listed companies present in their sustainability reports. Furthermore, the purpose is to contribute to an increased understanding of how different companies' sustainability reporting differs in content both over time and between industries. The purpose of the study is also to answer the questions about how the content of the sustainability reports has changed between 2015 and 2020.    Method: To answer the study's question, we carry out a quantitative content analysis of a total of twenty different companies' sustainability reporting. In the study, we have chosen to examine listed companies from four different industries, a total of five companies from each industry. For the content analysis, we will use a coding scheme that we do ourselves where we start from the categories economically, environmentally, and socially. The categories are taken from the triple bottom line. The analysis is performed as a quantitative analysis according to the word method where we observe and mark concepts and words that we link to the categories in our coding scheme. The study also examines whether there is any statistically significant correlation between the number of pages that companies present and the number of observations made.     Empirical data and conclusion: The results from the study indicate that the companies 'focus in the report has shifted from social sustainability in 2015 to that environmental sustainability is instead the category that is presented most times in 2020. In terms of content in the companies' accounts, the two concepts are used in the same way. the years. It is only in the environmental category that we find new concepts or that certain environmental parts have become a larger section in the companies' reporting. From the study, what distinguishes most between the years is the scope of companies' accounts, the number of observations and pages increased remarkably from 2015 to 2020. The correlation between the variables also shows statistical significance.

Urban scaling laws arise from within-city inequalities

Theories of urban scaling have demonstrated remarkable predictive accuracy at aggregate levels. However, they have overlooked the stark inequalities that exist within cities. Human networking and productivity exhibit heavy-tailed distributions, with some individuals contributing disproportionately to city totals. Here we use micro-level data from Europe and the United States on interconnectivity, productivity and innovation in cities. We find that the tails of within-city distributions and their growth by city size account for 36–80% of previously reported scaling effects, and 56–87% of the variance in scaling between indicators of varying economic complexity. Providing explanatory depth to these findings, we identify a mechanism—city size-dependent cumulative advantage—that constitutes an important channel through which differences in the size of tails emerge. Our findings demonstrate that urban scaling is in large part a story about inequality in cities, implying that the causal processes underlying the heavier tails in larger cities must be considered in explanations of urban scaling. This result also shows that agglomeration effects benefit urban elites the most, with the majority of city dwellers partially excluded from the socio-economic benefits of growing cities