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140 articles for “uncertainty”
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Research ArticleOpen accessIn the abstractSolid Waste Management in Petroleum RefineriesJadea S. Alshammari, Fatma K. Gad, Ahmed A.M. Elgibaly, Abdul Rehman KhanWaste management became focus of attention of many researchers and scientists in the last half century due to its vital importance. Waste management covered waste source reduction in general, by recycling, reusing, composting, incineration with or without energy recovery, fuel production and land filling. A common approach of waste management models were for specific problems with a limited scope (like … …American Journal of Environmental Sciences, Vol. 4, Issue 4 · 31 Aug 2008 · 6,945 accessesView PDFCite
Research ArticleOpen accessIn the abstractPile Instrumentation Using Retrievable SensorsFaisal Hj. Ali, Bujang B.K. Huat, Lee Sieng KaiStrain gauges are normally used to monitor the shortening or compression of pile during static pile load test. For concrete spun pile, the technique used either by incorporating high temperature-resistant strain gauges into the heat-cured production process of the spun piles or by installing an instrumented steel pipe into the hollow core of the spun piles followed by cement grout … …American Journal of Applied Sciences, Vol. 5, Issue 5 · 31 May 2008 · 7,616 accessesView PDFCite
Research ArticleOpen accessIn the abstractThe Volatility and Asymmetry of Won/Dollar Exchange RateSeok Yoon, Ki Seong LeeThe study on volatility and asymmetry of the exchange rate by applied to the daily Won/Dollar exchange rate shows that past volatility of the exchange rate still has strong persistency at present and asymmetry effect and the leverage effect, which explain that volatility shock has an effect on the uncertainty of the exchange rate, are also existent after the free … …Journal of Social Sciences, Vol. 4, Issue 1 · 31 Mar 2008 · 8,570 accessesView PDFCite
Research ArticleOpen accessIn the abstractStochastic Inflow Simulation for Searching Rule CurvesAnongrit Kangrang, Anujit Phumphan, Witsanukorn ChaiyapoomRule curves are basic monthly guidelines for long term reservoir operation. Generally, the optimal rule curves are searched by reservoir simulation model and optimization techniques. A traditional reservoir simulation does not consider the risk of reservoir operation caused by natural uncertainty from inflow. A stochastic simulation model embedded genetic algorithm model is developed for searching the optimal rule curves in … …American Journal of Applied Sciences, Vol. 5, Issue 3 · 31 Mar 2008 · 7,307 accessesView PDFCite
Research ArticleOpen accessIn the abstractHIV Prevention Intervention Outcome among Minority Adolescents in Court Mandated Drug TreatmentJessy Devieux, Robert C. McMahon, Rhonda Rosenberg, Robert M. MalowProblem statement: Delinquent adolescents with substance abuse disorders frequently engage in behaviors that elevate their risk of contracting HIV. Although effective risk reduction interventions are urgently needed, there is uncertainty about the nature of interventions required to produce change. Approach: This study evaluated whether Modified version of Becoming A Responsible Teen (M-BART) produced greater reductions in drug use and sexual … …American Journal of Infectious Diseases, Vol. 3, Issue 4 · 31 Dec 2007 · 6,342 accessesView PDFCite
Research ArticleOpen accessIn the abstractContribution of the Entropy Function to the Study of Collimator for Nuclear Medicine ImagingM.S. Bouhdima, I. Elloumi, M.H.B. GhozlenScintigraphic image currently used in the diagnosis or the evaluation process of tissues, is strongly dependant on several technical parameters specially collimator characteristics. The present work describes a numerical method, based on entropy function, able to specify depth and hole diameter of collimator as well as other geometrical parameters to get a better accuracy in scintigraphy evaluation. From the classical … …American Journal of Applied Sciences, Vol. 4, Issue 10 · 31 Oct 2007 · 6,739 accessesView PDFCite
Research ArticleOpen accessIn the abstractRobust Flight Control Design for a Turn Coordination System with Parameter UncertaintiesAri Legowo, Hiroshi OkuboThis paper presents a method of robust control system design for aircraft flight control systems with the existence of uncertainty parameters such as stability and control derivatives resulted by parameter identification process using real flight test data. A nonlinear model of aircraft turn coordination system is considered where the problem is to find the optimal controller by using the H∞ … …American Journal of Applied Sciences, Vol. 4, Issue 7 · 31 Jul 2007 · 7,500 accessesView PDFCite
Research ArticleOpen accessIn the abstractA Fuzzy-GAs Model for Determining Varied Irrigation EfficiencyAnongrit Kangrang, Chavalit ChaleeraktrakoonIrrigation efficiency is necessary information in water resource management. We proposed fuzzy sets approach for estimating varied irrigation efficiency. Genetic algorithms technique was applied to calibrate membership function of fuzzy model. The fuzzy sets technique considered the uncertainty of the available water resource and required area as the input variables. The approach model was applied to determine the fluctuated irrigation … …American Journal of Applied Sciences, Vol. 4, Issue 6 · 30 Jun 2007 · 7,353 accessesView PDFCite
Research ArticleOpen accessIn the abstractForecasting River Flow in the USA: A Comparison between Auto-Regression and Neural Network Non-Parametric ModelsAbdel K.M. Baareh, Alaa F. Sheta, Khaled A. KhnaifesForecasting a time series became one of the most challenging tasks to variety of data sets. The existence of large number of parameters to be estimated and the effect of uncertainty and outliers in the measurements makes the time series modeling too complicated. Recently, Artificial Neural Network (ANN) became quite successful tool to handle time series modeling problem. This paper … …Journal of Computer Science, Vol. 2, Issue 10 · 31 Oct 2006 · 6,968 accessesView PDFCite
Research ArticleOpen accessIn the abstractAnalyzing the Electricity Consumption Using Experimental Design TechniqueS. F. Ghaderi, M. A. Azadeh, Sh. BamdadExperimental design technique is a powerful tool that is used in uncertainty cases, when a great amount of data is available. In this paper, the effects of different factors on the determination of electricity consumption are analyzed. This analysis is based on experimental design technique. The implementation of the proposed technique is shown applying electricity consumption in Iran. …American Journal of Applied Sciences, Vol. 2, Issue 10 · 31 Oct 2005 · 6,588 accessesView PDFCite