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Item type:Publication, Access status: with files , Some properties of weak Γ-hyperfilters in ordered Γ-semihypergroupsThe main purpose of this paper is to study fundamental properties of weak Γ-hyperfilters on ordered Γ-semihypergroups that is a generalization of Γ-hyperfilters. Also, we investigate the relationship between weak Γ-hyperfilters and prime Γ-hyperideals in ordered Γ-semihypergroups. Finally, we introduce weak m,n-Γ-hyperfilters of ordered Γ-semihypergroups and conclude in paper with arising explicit theorems.Publicationtype: Journal Article124 175 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , A biologically inspired framework for the intelligent control of mechatronic systems and its application to a micro diving agent(Hindawi Publishing Corporation, 2018-12-30); ; ; ; Mechatronic systems are becoming an intrinsic part of our daily life, and the adopted control approach in turn plays an essential role in the emulation of the intelligent behavior. In this paper, a framework for the development of intelligent controllers is proposed. We highlight that robustness, prediction, adaptation, and learning, which may be considered the most fundamental traits of all intelligent biological systems, should be taken into account within the project of the control scheme. Hence, the proposed framework is based on the fusion of a nonlinear control scheme with computational intelligence and also allows mechatronic systems to be able to make reasonable predictions about its dynamic behavior, adapt itself to changes in the plant, learn by interacting with the environment, and be robust to both structured and unstructured uncertainties. In order to illustrate the implementation of the control law within the proposed framework, a new intelligent depth controller is designed for a microdiving agent. On this basis, sliding mode control is combined with an adaptive neural network to provide the basic intelligent features. Online learning by minimizing a composite error signal, instead of supervised off-line training, is adopted to update the weight vector of the neural network. The boundedness and convergence properties of all closed-loop signals are proved using a Lyapunov-like stability analysis. Numerical simulations and experimental results obtained with the microdiving agent demonstrate the efficacy of the proposed approach and its suitableness for both stabilization and trajectory tracking problems.Publicationtype: Journal ArticleScopus© Citations 15 1704 1526 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Empty container management at ports considering pollution, repair options, and street-turns(Hindawi Publishing Corporation, 2016-11-01); ; ; International trade imbalances make the management of empty containers within shipping networks an important economic and ecological problem. While import-dominated ports accumulate large amounts of empty containers, export-dominated ports need them as transport resources, requiring a repositioning transportation of empty containers on the sea and land side. Acknowledging the importance of the problem, plenty of respective literature has appeared. Since periodic review inventory management systems allow to model the inherent stochasticity of empty container transportation, they have emerged as a major solution approach in the domain. Nevertheless, existing approaches often omit crucial economic and ecological real world conditions determining the success of empty container management. Pollution, repair options, and street-turns are important aspects in this context. In this work, we present new stochastic review policies incorporating a realistic allocation scheme for empty container emissions, realistic maintenance, and repair options as well as street-turns. We analyze the optimality of the proposed polices and evaluate them in a simulation model with metaheuristic parameter search based on extensive real-world data from a major global shipping company operating in Latin America. Results provide insights for academics and practitioners about the economic and ecological impact of the distinct empty container management polices within a shipping network.Publicationtype: Journal ArticleScopus© Citations 14 540 676