1,721,683 research outputs found
Optimization of Double Wishbone Suspension: Evaluating the Performance of Classes of Algorithms
No full textDouble wishbone suspension systems are employed in high-performance vehicles owing to their superior control over wheel motion. The design of a double-wishbone suspension is a challenging multi-objective problem due to the many inter- related quantities that are key in determining its performance and vary during its motion. The design activity is thus a time-consuming and complex iterative process that aims to tune their variation and minimize deviations from the desired performance characteristics while requiring the satisfaction of mechanical constraints. Computational optimization methods can be integrated into the design activity only after an assessment of their capability to support efficiently and effectively an iterative workflow. In this work, we start with the mathematical modeling of the camber angle of the double wishbone suspension. Then, we use the multi-model optimization approach that includes metaheuristic algorithms (Genetic Algorithms, Particle Swarm Optimization, Gradient Descent, and Ant Colony Optimization) and classical methods (Nelder-Mead, Interior Point, Simulated Annealing, and Random Search). These methods are assessed in terms of objective value, computational time, and memory usage in an effort to minimize the variation of camber angles from the specified constraints. The results prove that the Interior Point method is more accurate and efficient in optimizing the suspension's camber angle across its operational range, followed by other classical methods
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Fixed point results in cone metric spaces for contractions of Zamfirescu type
No full textWe prove a result on points of coincidence and common fixed points in cone metric spaces for two self mappings satisfying a weak generalized contractive condition of Zamfirescu type. We deduce some results on
common fixed points for two self mappings satisfying a weak contractive type condition. These results generalize some well-known recent results
Common Fixed Point of Generalized Contractive Type Mappings in Cone Metric Spaces
No full textWe obtain common fixed points and points of
coincidence of a pair of mappings satisfying a generalized contractive type condition in cone metric spaces. Our results
generalize some well-known recent results in the literature
On Edelstein Type Multivalued Random Operators
No full textThe purpose of this paper is to provide stochastic versions of several results on fixed point theorems in the literature
Coupled coincidence point results for (φ,ψ)-contractive mappings in partially ordered metric spaces
No full textIn this paper, we extend the coupled coincidence point theorems for a mixed g-monotone operator F:X×X→X obtained by Alotaibi and Alsulami [Fixed Point Theory Appl. (2011), article ID 44], by weakening the involved contractive condition. Two examples are given to illustrate the effectiveness of our generalizations. Our result also generalizes some recent results announced in the literature. Moreover, some applications to integral equations are presented
On a theorem of Khan in a generalized metric space
No full textExistence and uniqueness of fixed points are established for a mapping satisfying a contractive condition involving a rational expression on a generalized metric space. Several particular cases and applications as well as some illustrative examples are given
Fixed point results in cone metric spaces
No full textWe prove a result on points of coincidence and common fixed points for three self mappings satisfying a weak generalized contractive type condition in cone metric spaces. We deduce some results on common fixed points for two self mappings satisfying a weak contractive type
condition in cone metric spaces. This results generalize some well-known recent results
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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