Results 11 to 20 of about 868,219 (267)

Uncertainties and Recommendations [PDF]

open access: yesAMBIO: A Journal of the Human Environment, 2004
An assessment of the impacts of changes in climate and UV-B radiation on Arctic terrestrial ecosystems, made within the Arctic Climate Impacts Assessment (ACIA), highlighted the profound implications of projected warming in particular for future ecosystem services, biodiversity and feedbacks to climate.
Callaghan, T.V.   +13 more
openaire   +3 more sources

A Two-Stage Method to Determine Optimal Product Sampling considering Dynamic Potential Market

open access: yesThe Scientific World Journal, 2015
This paper develops an optimization model for the diffusion effects of free samples under dynamic changes in potential market based on the characteristics of independent product and presents a two-stage method to figure out the sampling level. The impact
Zhineng Hu, Wei Lu, Bing Han
doaj   +1 more source

VACS: VAccination disComfort Scale

open access: yesClinics and Practice, 2022
The vaccination of children is a crucial tool to protect both individuals and the world in general from various diseases and pathogens. Unfortunately, the vaccination procedure is not a pleasant one for all children, with many experiencing various levels
Manolis Wallace   +2 more
doaj   +1 more source

A Dynamical Innovation Diffusion Model with Fuzzy Coefficient and Its Application to Local Telephone Diffusion in China

open access: yesDiscrete Dynamics in Nature and Society, 2013
This paper studies the innovation diffusion problem with the affection of urbanization, proposing a dynamical innovation diffusion model with fuzzy coefficient, and uses the shifting rate of people from rural areas stepping into urban areas to show the ...
Zhigao Liao, Jiuping Xu, Liming Yao
doaj   +1 more source

Uncertainty Traps [PDF]

open access: yesThe Quarterly Journal of Economics, 2014
Abstract We develop a theory of endogenous uncertainty and business cycles in which short-lived shocks can generate long-lasting recessions. In the model, higher uncertainty about fundamentals discourages investment. Since agents learn from the actions of others, information flows slowly in times of low activity and uncertainty remains ...
Pablo Fajgelbaum   +2 more
openaire   +4 more sources

A Survey of Methods for Gas-Lift Optimization

open access: yesModelling and Simulation in Engineering, 2012
This paper presents a survey of methods and techniques developed for the solution of the continuous gas-lift optimization problem over the last two decades. These range from isolated single-well analysis all the way to real-time multivariate optimization
Kashif Rashid   +2 more
doaj   +1 more source

A Class of Two-Person Zero-Sum Matrix Games with Rough Payoffs

open access: yesInternational Journal of Mathematics and Mathematical Sciences, 2010
We concentrate on discussing a class of two-person zero-sum games with rough payoffs. Based on the expected value operator and the trust measure of rough variables, the expected equilibrium strategy and r-trust maximin equilibrium strategy are defined ...
Jiuping Xu, Liming Yao
doaj   +1 more source

A Class of Expected Value Bilevel Programming Problems with Random Coefficients Based on Rough Approximation and Its Application to a Production-Inventory System

open access: yesAbstract and Applied Analysis, 2013
This paper focuses on the development of a bilevel optimization model with random coefficients for a production-inventory system. The expected value operator technique is used to deal with the objective function, and rough approximation is applied to ...
Liming Yao, Jiuping Xu
doaj   +1 more source

An Equilibrium Chance-Constrained Multiobjective Programming Model with Birandom Parameters and Its Application to Inventory Problem

open access: yesJournal of Applied Mathematics, 2013
An equilibrium chance-constrained multiobjective programming model with birandom parameters is proposed. A type of linear model is converted into its crisp equivalent model. Then a birandom simulation technique is developed to tackle the general birandom
Zhimiao Tao, Jiuping Xu
doaj   +1 more source

Collaboration Skills in Educational Robotics: A Methodological Approach—Results from Two Case Studies in Primary Schools

open access: yesEducation Sciences, 2023
This study proposes a methodological approach that allows educational robotics to be used in order to develop collaboration skills in educational settings.
Emmanouil A. Demetroulis   +4 more
doaj   +1 more source

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