Search results for "Uncertainty"
showing 10 items of 1010 documents
Integrative Strategies in Mixed Methods Research
2020
Despite the critical role of integration as a methodological concept in mixed methods studies, researchers lack a theory for integrating. In this article, we introduce the concept of integrative strategy by analyzing three mixed methods rehabilitation-related studies. These studies represented an analytical strategy based on a multiperspective stakeholder approach, a theory-bound analytical strategy, and a theory-oriented synthesizing strategy. We define integrative strategy as a process in which the system of relations within the study is explicated and justified in accordance with the research purpose and phenomenon. This article contributes to mixed methods research by providing a novel…
An EEMD Aided Comparison of Time Histories and Its Application in Vehicle Safety
2017
In the context of signal processing, the comparison of time histories is required for different purposes, especially for the model validation of vehicle safety. Most of the existing metrics focus on the mathematical value only. Therefore, they suffer the measuring errors, disturbance, and uncertainties and can hardly achieve a stable result with a clear physical interpretation. This paper proposes a novel scheme of time histories comparison to be used in vehicle safety analysis. More specifically, each signal for comparison is decomposed into a trend signal and several intrinsic mode functions (IMFs) by ensemble empirical mode decomposition. The trend signals reflect the general variation a…
Integrated Urban Water Modeling with Uncertainty Analysis
2005
In the last 20th years, the scientific world has got particular care towards the problems that involve the respect of the environment. According to this point, several researches were developed to describe the phenomena that take place during both wet and dry period and to increase the knowledge in this field. In particular, the attention was addressed towards the problems linked with the pollution of the water body because of the pollution carried by rainfall waters in the urban environment. In order to obtain a good description of the problem, it is important, of course, to analyze both quantity and quality aspects connected with all the transformation phases that characterize the urban w…
The Euro and Monetary Policy Transparency
2002
This paper focuses on a possible explanation for the weakness of the euro, namely the lack of transparency of the European Central Bank's (ECB) monetary policy. In order to obtain a time-varying measure of monetary policy uncertainty in both the U.S. and Euroland, we estimate a Stochastic Volatility model using policy-adjusted short-term interest rates. We also analyze directly the impact of higher uncertainty on the euro-dollar exchange rate. The empirical findings are in line with those of other studies, and show that the U.S. Fed is more transparent than the ECB. This results in higher volatility of European interest rates, capital outflows, and a weaker euro vis-a-vis the U.S. dollar.
Nenoteiktības nenoturības saistība ar elektrodermālās aktivitātes rādītājiem
2019
Darba mērķis bija noskaidrot, kāda saistība pastāv starp indivīda nenoteiktības nenoturību un elektrodermālo aktivitāti1) noteiktā un nenoteiktā situācijā, 2) neitrālu un negatīvu audiālo stimulu gadījumā, 3) gaidot situācijas iznākumu un pēc tās. Pētījumā piedalījās 25 dalībnieki, ar vidējo vecumu M = 24,62, SD = 4,42 gadi. Tika demonstrēta attēlu un skaņas signālu sērija, paralēli mērot elektrodermālo aktivitāti. Tika izmantota Nenoteiktības nenoturības 12 pantu skalu un DASS-21. Nenoteiktības nenoturības 12 pantu skalas iekšējā saskaņotība bija laba, bet konverģentā validitāte bija vāja. Tika secināts, ka indivīdiem ar augstāku nenoteiktības nenoturību, bija lielāka elektrodermālā aktivi…
Exploring students’ identity development from the perspective of study difficulties
2020
This work-in-progress paper in research category reports preliminary findings on how students taking introductory computing courses develop identity from the perspective of study difficulties. The motivation was that students identified lack of meaning and prospects (cf. identity) as a study difficulty in a previous qualitative study. The present study further explores this finding by issuing both an identity development and a self-efficacy scale to a larger first-year student cohort. The aim is to characterize the study cohort by the aspects included in the identity development scale, and thereby increase understandings of students’ challenges. Moreover, a correlation analysis between iden…
Interactive methods for multiobjective robust optimization
2018
Practical optimization problems usually have multiple objectives, and they also involve uncertainty from different sources. Various robustness concepts have been proposed to handle multiple objectives and the involved uncertainty simultaneously. However, the practical applicability of the proposed concepts in decision making has not been widely studied in the literature. Developing solution methods to support a decision maker to find a most preferred robust solution is an even more rarely studied topic. Thus, we focus on two goals in this thesis including 1) analyzing the practical applicability of different robustness concepts in decision making and 2) developing interactive methods for sup…
Szacowanie czasu realizacji projektu przy nieprecyzyjnych zmiennych
2017
The paper presents the essence and significance of the project time estimation under uncertainty and risk using ordered fuzzy numbers. The proposed approach is based on a fuzzy model of uncertainty using ordered fuzzy numbers as imprecise data – duration times. The presented extended critical path method is a new approach that has not been presented so far in the literature of the subject. The authors present the implementation of the approach on an example. The advantages of the proposed approach have been outlined in the paper. The proposed approach can find practical applications in decision-making problems under conditions of risk and uncertainty, supporting decision-makers in the plann…
The Calderón problem for the conformal Laplacian
2022
We consider a conformally invariant version of the Calderón problem, where the objective is to determine the conformal class of a Riemannian manifold with boundary from the Dirichlet-to-Neumann map for the conformal Laplacian. The main result states that a locally conformally real-analytic manifold in dimensions can be determined in this way, giving a positive answer to an earlier conjecture [LU02, Conjecture 6.3]. The proof proceeds as in the standard Calderón problem on a real-analytic Riemannian manifold, but new features appear due to the conformal structure. In particular, we introduce a new coordinate system that replaces harmonic coordinates when determining the conformal class in a …
Projecting Pension Expenditures in Spain: On Uncertainty, Communication and Transparency
2008
In this paper we suggest a set of indicators about the future performance of the Spanish public pension system and a suitable method of representing their uncertainty, in order to improve the communication to the public opinion about its main future challenges. Spain seems a particularly interesting case in Europe to illustrate our proposals, since the social security system has been in surplus for nine consecutive years, in sharp contrast to the projections made just a decade ago, but, at the same time, most projections foresee for Spain one of the highest increases in public expenditure among EU countries due to ageing. We argue that simple, transparent, credible, public and periodic indi…