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Nested space mapping technology for expedite EM-driven design of compact RF/microwave components
(2014) Bekasiewicz, Adrian; Koziel, Slawomir; Kurgan, Piotr; Leifsson, Leifur; Department of Engineering
A robust simulation-driven methodology for rapid and reliable design of RF/microwave circuits comprising compact microstrip resonant cells (CMRCs) is presented. We introduce a nested space mapping (NSM) technology, in which the inner space mapping layer is utilized to improve the generalization capabilities of the equivalent circuit model corresponding to a constitutive element of the circuit under consideration. The outer layer enhances the surrogate model of the entire structure under design. We demonstrate that NSM significantly improves performance of surrogate-based optimization of composite RF/microwave structures. It is validated using two examples of UWB microstrip matching transformers (MTs) and compared to other competitive surrogate-assisted methods attempting to solve the problem of compact RF/microwave component design.
Verk
Computational optimization, modelling and simulation : Past, present and future
(2014) Yang, Xin She; Koziel, Slawomir; Leifsson, Leifur; Department of Engineering
An integrated part of modern design practice in both engineering and industry is simulation and optimization. Significant challenges still exist, though huge progress has been made in the last few decades. This 5th workshop on Computational Optimization, Modelling and Simulation (COMS 2014) at ICCS 2014 will summarize the latest developments of optimization and modelling and their applications in science, engineering and industry. This paper reviews the past developments, the state-of-the-art present and the future trends, while highlighting some challenging issues in these areas. It can be expected that future research should focus on the data intensive applications, approximations for computationally expensive methods, combinatorial optimization, and large-scale applications.
Verk
Social correlates of distress following hematopoietic stem cell transplantation: Exploring the role of loneliness and cognitive processing : Exploring the role of loneliness and cognitive processing
(2012-10) Mosher, Catherine E; Lepore, Stephen J; Wu, Lisa; Austin, Jane; Valdimarsdottir, Heiddis; Rowley, Scott; Isola, Luis; Redd, William H; Rini, Christine; Department of Psychology
This study investigated whether loneliness and cognitive processing explain the influence of negative (social constraints) and positive (emotional support) relationship qualities on cancer survivors' distress. Participants were 195 cancer survivors who had undergone hematopoietic stem cell transplantation. Path analysis supported the hypothesis that loneliness and cognitive processing would mediate the association between social constraints and distress. Only loneliness mediated the association between emotional support and distress - an indirect effect significant only when support came from family and friends rather than a partner. Findings suggest that addressing social constraints may enhance cancer survivors' adjustment.
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Ársskýrsla Stofnunar rannsóknasetra 2021
(2021) Stefáns Berndsen, María Ásdís
Verk
Ársskýrsla Stofnunar rannsóknasetra 2012
(2012) Gunnarsdóttir, Birna

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