Search results for "uncertainty"
showing 10 items of 1010 documents
The Fouling phenomena in membrane bioreactors: a comparison of different mathematical modelling approaches
2015
Eight different modelling approaches for membrane fouling modelling have been compared and the uncertainty has been assessed. Overall the eight approaches provided satisfactory results in terms of model fitting with the measured data. Different results have been obtained in terms of uncertainty bounds showing a different reliability of the model approaches. The study allowed to gain insights about the mechanisms which control fouling in membrane bioreactors.
Supportive Communication in the Workplace
2019
Supportive communication is a form of social interaction that produces resources with which to solve situational problems and manage emotional strain. Through the management of uncertainty, supportive communication enhances the perception of personal control over life events and strengthens the perception of acceptance. It is enacted in the seeking of support, in providing support, and in supportive listening as a form of emotional and informational support. In the workplace, supportive communication is crucially important: It promotes productive work and employees’ well-being as well as job satisfaction and engagement in the organization. This chapter presents the foundations of supportive…
Ordered fuzzy rules generation based on incremental dataset
2021
This paper proposes a novel approach for building transparent knowledge-based systems by generating interpretable fuzzy rules that allow for present dependences between quantitative variables by accounting for uncertainty and the dynamics of their values. In the approach, IF-THEN rules are used to show the conditional relationship between the ordered fuzzy numbers, which contain additional information about the tendencies of variables' value changes. This paper elaborates an approach of mining ordered fuzzy rules from numerical data included in an incremental database. This approach develops the ability to record uncertainty and its change in the context of rapidly changing data. In additio…
Football match attendance in Finland
2022
Football fans prefer to see their favourite team win in close matches. Compared to other forms of entertainment, the outcome of sport game is unknown beforehand. Opera audience knows the plot in advance, but in football the winner is revealed only after 90 minutes. The scientific literature of modern sport economics demand theory implies that successful leagues must be based on relatively even competition. This degree of parity within a league is labelled as competitive balance. Sport leagues usually claim that outcome uncertainty is necessary to maintain interest among fans. In this paper, uncertainty of outcome hypothesis is tested applying football data from the highest tier in Finnish m…
Compensation of Nonlinearity of Voltage and Current Instrument Transformers
2019
This paper aims at characterizing and improving the metrological performances of current and voltage instrument transformers (CTs and VTs) in harmonic measurements in the power system. A theoretical analysis is carried out to demonstrate that, due to the iron core nonlinearity, CT and VT output signal is distorted even when the input signal is a pure sine wave. Starting from this analysis, a new method for CT and VT characterization and compensation is proposed. In a first step, they are characterized in sinusoidal conditions and the harmonic phasors of the distorted output are measured; in the second step, these phasors are used to compensate the harmonic phasors measured in normal operati…
Uncertainty analysis in sewer systems performance evaluation
2005
In recent years, in order to analyse complex urban drainage systems and to identify the most effective measures for improving their efficiency, many parameters, or indicators, have been defined and many methodologies have been proposed in order to quantify sewer systems performance in the most objective and general way. However, some uncertainty arises in these methodologies due to choices which the user has to take in applying the procedure. Thus, performance analysis results are affected by operator experience and they are mainly useful for comparison between different scenarios applied to the same system. In the present paper, a statistical analysis of sewer systems performance has been …
Interaction in online learning environments : how to support collaborative activities in higher education settings
2006
Collaboration promoted and supported by instructional technology has the potential to lead learners to deeper understanding and knowledge building. There have been optimistic views that any web based interaction can be educationally valuable. However, online learning environments do not, as such, guarantee that learners will achieve genuine collaboration. It seems that there are several difficulties facing those who wish to employ online learning environments as a medium for productive learner interaction. The particular aim of this exploration of interaction and learning in computer supported collaborative learning environments was to study the interplay between learners and consider the w…
Univariate and multivariate properties of wind velocity time series
2009
We analyze the time series of hourly average wind speeds measured at 29 different stations located in Sicily, a region with a complex morphology. The investigation, performed from the univariate as well as the multivariate point of view, evidences that the statistical properties of wind at the single sites have features that are not reproduced by standard models and, thus, require specific modeling. Moreover, the synchronous evolution of wind velocity presents a cluster structure, obtained with different algorithms, that persists in the standard deviation too.
Newcomers in the Workplace
2019
When newcomers enter a workplace, the focus is usually only on orientation and onboarding tactics, which aim to socialize newcomers into the workplace. However, it is through workplace relationships that newcomers make sense of their work tasks and create an understanding of “our workplace.” This chapter describes the processes of interpersonal communication in the workplace during a newcomer’s entry phase. Newcomers may face uncertainty regarding professional performance, relationships, job tasks, or membership. This uncertainty is managed by information-seeking strategies. In social interaction with others, newcomers construct their belonging through membership negotiation and identificat…
Intolerance of Uncertainty and Risk Perception during the COVID-19 Pandemic: The Mediating Role of Fear of COVID-19
2022
The COVID-19 pandemic, a period of uncertainty and risk, has presented a threat to people’s physical and mental health worldwide. Previous research has shown that pandemic-related uncertainty can contribute to individuals’ psychological distress and coping responses. Therefore, the aim of this study was to investigate the relationship between intolerance of uncertainty and risk perception (i.e., individual’s perceived likelihood of becoming infected both for themselves and people in one’s own country and perceived severity of the infection), and the mediating role of fear of COVID-19. This two-wave longitudinal study (T1 = April 2020; T2 = May 2020) involved 486 youn…