86,991 research outputs found
Supervised Classifier Combination trough Generalized Additive Multi-Model
No full textJ. Kittler, F. Roli (Eds.), Lecture Notes in Computer Scienc
Supervised Classifier Combination through Generalized Additive Multi-Model
No full textJ. Kittler, F. Roli (Eds.), Lecture Notes in Computer Scienc
Recurrent random forest for the assessment of popularity in social media
No full textPopularity in social media is mostly interpreted by drawing a relationship between a social media account and its followers. Although understanding popularity from social media has been explored for about a decade, to our knowledge, the extent to which the account owners put efforts to enhance their popularity has not been evaluated in detail. In this paper, we focus on Twitter, a popular social media, and consider the case study of the 2016 US elections. More specifically, we aim to assess whether candidates endeavor to improve their style of tweeting over time to be more attractive to their followers. An ad hoc-defined predictive model based on a recurrent random forest is used for this purpose. To this end, we build a classification model whose features are obtained from the characteristics of a set of content/sentiment information extracted from the tweets. Next, we derive an index of social media popularity for both candidates. Results show that Trump wisely exploited Twitter to attract more people by tweeting in a well-organized and desirable manner and that his tweeting style has increased his popularity in social media. The differences in the tweeting styles of the two presidential candidates and the links between the sentiments arising from candidates’ tweets and their popularity index are also investigated
Optimism and its impact on mental and physical well-being
No full textMany studies have been carried out about the effectiveness of optimism as a psychological phenomenon, leading to various theoretical formulations of the same concept, conceptualized as "disposition", "attributional style", "cognitive bias", or "shared illusion". This overview is an attempt to explore the "optimism" concept and its relations with mental health, physical health, coping, quality of life and adaptation of purpose, health lifestyle and risk perception. Positive and negative expectations regarding the future are important for understanding the vulnerability to mental disorders, in particular mood and anxiety disorders, as well as to physical illness. A significant positive relation emerges between optimism and coping strategies focused on social support and emphasis on positive aspects of stressful situations. Through employment of specific coping strategies, optimism exerts an indirect influence also on the quality of life. There is evidence that optimistic people present a higher quality of life compared to those with low levels of optimism or even pessimists. Optimism may significantly influence mental and physical well-being by the promotion of a healthy lifestyle as well as by adaptive behaviours and cognitive responses, associated with greater flexibility, problem-solving capacity and a more efficient elaboration of negative information. © Conversano et al
Carrying capacity of pelagic ecosystems of the Ross Sea (Antarctica) during summer: primary production processes and limiting factors.
No full textThe Ross Sea is one of the most productive areas of the Southern Ocean; seasonal variations in biomass accumulation and production are very pronounced. Highest values of primary production are recorded in austral spring till early summer. During summer primary production sharply decreases and micro-nutrients limitation as well as deepening of the upper mixed layer have been invoked as major factors limiting phytoplankton growth. During austral summer 1996 and 2001 two oceanographic cruises were carried out in the Ross Sea within the framework of the PNRA.
Primary production processes are presented for different environmental conditions during austral summer characterized by ice free waters and extensive ice coverage in offshore waters.
In extensive pack ice coverage, the average Chlorophyll a (Chla) concentration was about three times the values recorded under ice-free conditions but the primary production was relatively lower. In situ primary production and photosynthetic parameters over few days show that in most of the area high primary production values occurs only in the first five meter of the water column and within the melting pack-ice. Notwithstanding the some values of phytoplankton biomass, water column stability, similar irradiance levels, photosynthetic capacity was suppressed in deeper layer indicating a low carrying capacity of pelagic ecosystem. In contrast to a very high variability in phytoplankton biomass and primary production, photosynthetic parameters vary within narrow ranges.
Spatial and temporal distribution of biomass (Chla), in situ simulated primary production, photosynthetic parameters (PvsE) are presented in order to assess the carrying capacity and limiting factors of primary production of the Ross Sea, during austral summer, in different environmental conditions
Online promotion of UNESCO heritage sites in Southern Europe: website information content and managerial implications
No full textSpecific and Destination Websites of UNESCO Heritage Sites (WUHS) located in France, Italy and Spain are analyzed to investigate if the management of UNESCO is able to promote heritages efficiently in the World Wide Web. Empirical evidence supports the idea that WUHS ranking depends on the type and localization of the site and the quantity and quality of WUHS information influences the time spent by a user visiting a website-page. Therefore, managers could be able to improve the role of websites through: a) a more efficient and incisive promotion of a site or a destination; b) a WUHS design based on target markets’ needs and the type of information that markets perceive as useful. An “adequate” WUHS is thus intended as a virtual place where tourists can find all the relevant information
Erratum: Optimal enhancement configuration of silica nanoparticles for ultrasound imaging and automatic detection at conventional diagnostic frequencies (Investigative Radiology (2010) 45 (715-724))
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