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Hybrid Methodology (hybrid + methodology)
Selected AbstractsA hybrid feedback for a benchmark problem of idle speed controlINTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL, Issue 5 2010A. Balluchi Abstract The ever increasing demands on passengers' comfort, safety, emissions and fuel consumption imposed by car manufacturers and regulations call for advanced techniques and the use of cycle-accurate models in automotive control. In this paper, we focus on such approach to the idle speed control. It is natural to resort to hybrid methodologies, because of the rich combination of time and event-based behaviors exhibited by a controlled engine. A hybrid benchmark problem is considered and addressed first by analyzing the equilibria of the system and then testing a simple hybrid feedback strategy. Copyright © 2009 John Wiley & Sons, Ltd. [source] A kriging method for the solution of nonlinear programs with black-box functionsAICHE JOURNAL, Issue 8 2007Eddie Davis Abstract In this article, a new methodology is developed for the optimization of black-box systems lacking a closed-form mathematical description. To properly balance the computational cost of building the model against the probability of convergence to global optimum, a hybrid methodology is proposed. A kriging approach is first applied to provide information about the global behavior of the system considered, whereas a response surface method is considered close to the optimum to refine the set of candidate local optima and find the global optimum. The kriging predictor is a global model employing normally distributed basis functions, so both an expected sampling value and its variance are obtained for each test point. The presented work extends the capabilities of existing response surface techniques to address the refinement of optima located in regions described by convex asymmetrical feasible regions containing arbitrary linear and nonlinear constraints. The performance of the proposed algorithm is compared to previously developed stand-alone response surface techniques and its effectiveness is evaluated in terms of the number of function calls required, number of times the global optimum is found, and computational time. © 2007 American Institute of Chemical Engineers AIChE J, 2007 [source] Transformative Education: Chronicling a Pedagogy for Social ChangeANTHROPOLOGY & EDUCATION QUARTERLY, Issue 1 2008Miguel Guajardo This article chronicles the work of the Llano Grande Center for Research and Development, an educational nonprofit organization in South Texas, by following the narrative of one of its students and two of the authors, who are also founders of Llano Grande. Through the use of ethnography, visuals, and storytelling, they present an emerging theory of practice and a hybrid methodology that has contributed to the development of the work, the school, and the community. An activist agenda informed by practice and supported with theory is woven through the text in biographical form. The text also documents the cornerstones of the work: building strong relationships; work originating from self, place, and community; and engaging in meaningful work. When integrated into a seamless practice, this combination of guiding principles yields a certain power that youth and adults alike begin to negotiate within and between their peers, teachers, and community for change. This sense of self, efficacy, and power then informs much of their work as adults.,[Latino epistemology and education, activist ethnography, Llano Grande Center, storytelling, community as text, pedagogy of hope] [source] Design and synthesis of separation process based on a hybrid methodASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING, Issue 6 2009Chunshan Li Abstract A new general hybrid methodology for separation process synthesis and design is proposed, which considers different separation technologies by integrating mathematical modeling,Analytical Hierarchy Process (AHP) with heuristic approaches and thermodynamic insights. The methodology can provide suitable guidance for the initial separation process design and energy saving. Firstly, a general separation synthesis system based on thermodynamic insights is developed to select suitable separation techniques before sequencing, which reduces the complexity and size of synthesis search space. Then, the pseudo-component concept is proposed and used to deal with the azeotrope contained in the mixture, which widens the scope of the application of the proposed methodology. The AHP method is used to make a separation sequence by pairwise comparison matrices. Lastly, the separation of the pseudo-component will be considered, and it performs energy integration and a detailed process design. Application of the proposed methodology is highlighted through two industrial examples: one is the separation synthesis of a light-end refinery mixture. The other is azeotrope system, the mixture of phenol, o -cresol, p -cresol, and m -cresol. Copyright © 2009 Curtin University of Technology and John Wiley & Sons, Ltd. [source] | ||||||||||