Search results for "Uncertainty"
showing 10 items of 1010 documents
A study of Type B uncertainties associated with the photoelectric effect in low-energy Monte Carlo simulations
2021
The goal of this manuscript is to estimate Type B uncertainties in absorbed-dose calculations arising from the different implementations in current state-of-the-art Monte Carlo codes of low-energy photon cross-sections (<200 keV). Monte Carlo simulations are carried out using three codes widely used in the low-energy domain: PENELOPE-2018, EGSnrc, and MCNP. Mass energy-absorption coefficients for water, air, graphite, and their respective ratios; absorbed dose; and photon-fluence spectra are considered. Benchmark simulations using similar cross-sections have been performed. The differences observed between these quantities when different cross-sections are considered are taken to be a go…
Deep and Proximate Determinants of the World Income Distribution
2019
This paper studies the deep and proximate determinants of the evolution of the cross-country distribution of GDP per worker in the period 1960–2008 by a novel method based on an information criterion. We find that countries of our sample follow three distinctive growth regimes identified by two deep determinants, namely life expectancy at birth in 1960 and the share of Catholics in 1965, and that each regime is characterized by non-linearities. Growth regimes appear to be the main cause of the increased inequality and polarization, while technological catch-up, proxied by the initial level of GDP per worker, acts in the opposite direction. Finally, human capital marginally reduces polarizat…
Early warning system in logistics project management
2017
Risk management is a vital process in all complex logistics project management. We discuss the concept of early warning system EWS dedicated to logistics project, which enable management under the conditions of uncertainty and risk. The complexity and uniqueness of the logistics projects as well as the discontinuity of the effects in the environment of goods and services, significantly impact the inability to eliminate the risks and subsequently lead to changes during execution. The introduction into companies and supply chains things such as: principles, methods, mechanisms of knowledge management and project risk, e.g. by implementing into the logistics project management the early warnin…
LOGISTICS PROJECT PLANNING UNDER CONDITIONS OF RISK AND UNCERTAINTY
2017
The paper discusses highly important issues related to the practice of logistics project planning under conditions of certainty, risk, and uncertainty. This process requires the use of a variety of planning information (complete or incomplete, express or implied) as well as the generation of new knowledge. The decision-making process takes place in a deterministic or an nondeterministic situation; the former involves complete information (i.e., certainty) and the latter incomplete information (i.e., risk and uncertainty). Becoming acquainted with the discussed issues provides valuable practical knowledge that may be helpful in making important decisions when formulating concepts and models …
Zarządzanie wiedzą projektową w kontekście społecznej odpowiedzialności biznesu
2016
Project knowledge and relationships with stakeholders are treated as a po- tential source of project success, and thus such as a source of competitiveness. This means that there is a need for research into these issues, especially in the context of measuring a competitive advantage and potential and actual benefits of the acquisition of project knowledge and relationships with stakeholders in the context of corporate social responsibility.
'It's like a Sentence before the Sentence' - Exploring the Pains and Possibilities of Waiting for Imprisonment
2020
This article explores the implications of the ‘imprisonment queue’ in Norway. Based on interview data (N = 200), we show that while interviewees waiting to serve their sentences enjoy certain benefits such as being able to prepare for or negotiate the terms of their imprisonment, they also suffer from uncertainty and powerlessness. The suspension of their lives while they wait hinders them in pursuing their ground projects, things that really matter to them. This peculiar phenomenon has not received attention from prison scholars generally, as well as scholars writing on Nordic Exceptionalism specifically. This article addresses that gap and poses questions about the relative mildness of th…
Economic policy uncertainty effects for forecasting future real economic activity
2018
Recently introduced measures for Economic Policy Uncertainty (EPU) included in the data from 1997 - 2016 have a role in forecasting out-of-sample values for the future real economic activity for both the euro area and the UK economies. The inclusion of EPU measures, either for the US, the UK or for overall European economies, improves the forecasting ability of models based on standard financial market information, especially for the period before the 2008 global crisis. However, during and after the crisis period, the slope of the yield curve and excess stock market returns improves the out-of-sample forecast performance the most compared to an AR-benchmark model. Hence, the EPU informatio…
Effects of economic policy uncertainty on stock and bond market integration
2015
Tässä pro gradu – tutkielmassa tarkastellaan sitä , miten talouspoliitti nen epävarmuu s vaikut taa osake - ja korko markkina tuottojen väliseen yhteyteen . Tutkimuksessa saadut e mpiiriset havainnot viittaavat siihen, että kun reaalit alouden kasvu ylittää inflaati o- vauhdin , talouspoliittisen epävarmuuden kasvu on tekijä, joka vähentää osake - ja ko r- ko markkina tuottojen korrelaatiota . Sen sijaan kun inflaatio vauht i ylittää reaalitalouden kasvun, jota tässä tutkielmassa on mitattu S&P 500 i ndeksin osinkojen jaolla, kasvava talouspoliittinen epävarmuus vahvistaa osake - ja korkomarkkinatuottojen korrelaatiota . Tutkimus on toteutettu Yhdysvaltojen rahoitusmarkk inoiden aineistolle…
GRANULAR-INFORMATION-BASED RISK ANALYSIS IN UNCERTAIN SITUATIONS
2006
In the real life almost all of the decisions that we have to make incorporate uncertainty about the future events. Assessment of the uncertainty and, thus, the risk that is inherent in these decisions models can be critical. It is even truer if we are talking about the possibility of negative impact on the environment. It is very important to assess all the environmental risks in a project if there is any hazard to the environment. In this paper the possibility of using granular information is considered. The main advantage of the granular information is that it can be used to assess risks in situations when information about future events is incomplete and imprecise. Moreover, we can use n…
On overall sampling plan for small area estimation
2017
The time and budget restrictions in survey sampling can impose limits on the area sample sizes. This may reduce the possibility to obtain area-specific and population parameters estimates with adequate precision. Market research companies and institutes for producing official statistics face frequently this problem. Various models and methods for small area estimation (SAE) have been developed to solve this problem. The sample allocation must support the selected model and method to ensure efficient estimation and must be implemented in the design phase of the survey. The proposed allocation is developed by incorporating auxiliary information, a model, and an estimation method. The estimate…