A jigsaw puzzle framework for homogenization of high porosity foams

An approach to homogenization of high porosity metallic foams is explored. The emphasis is on the \Alporas{} foam and its representation by means of two-dimensional wire-frame models. The guaranteed upper and lower bounds on the effective properties are derived by the first-order homogenization with the uniform and minimal kinematic boundary conditions at heart. This is combined with the method of Wang tilings to generate sufficiently large material samples along with their finite element discretization. The obtained results are compared to experimental and numerical data available in literature and the suitability of the two-dimensional setting itself is discussed.Comment: 11 pages, 7 figures, 3 table

Proposing a Framework for the Restorative Effects of Nature through Conditioning: Conditioned Restoration Theory

Natural environments have been shown to trigger psychological and physiological restoration in humans. A new framework regarding natural environments restorative properties is proposed. Conditioned restoration theory builds on a classical conditioning paradigm, postulating the occurrence of four stages: (i) unconditioned restoration, unconditioned positive affective responses reliably occur in a given environment (such as in a natural setting); (ii) restorative conditioning, the positive affective responses become conditioned to the environment; (iii) conditioned restoration, subsequent exposure to the environment, in the absence of the unconditioned stimulus, retrieves the same positive affective responses; and (iv) stimulus generalization, subsequent exposure to associated environmental cues retrieves the same positive affective responses. The process, hypothetically not unique to natural environments, involve the well-documented phenomenon of conditioning, retrieval, and association and relies on evaluative conditioning, classical conditioning, core affect, and conscious expectancy. Empirical findings showing that restoration can occur in non-natural environments and through various sensory stimuli, as well as findings demonstrating that previous negative experience with nature can subsequently lower restorative effects, are also presented in support of the theory. In integration with other existing theories, the theory should prove to be a valuable framework for future research.publishedVersio

The Neuro-Immuno-Senescence Integrative Model (NISIM) on the Negative Association Between Parasympathetic Activity and Cellular Senescence

There is evidence that accumulated senescent cells drive age-related pathologies, but the antecedents to the cellular stressors that induce senescence remain poorly understood. Previous research suggests that there is a relationship between shorter telomere length, an antecedent to cellular senescence, and psychological stress. Existing models do not sufficiently account for the specific pathways from which psychological stress regulation is converted into production of reactive oxygen species. We propose the neuro-immuno-senescence integrative model (NISIM) suggesting how vagally mediated heart rate variability (HRV) might be related to cellular senescence. Prefrontally modulated, and vagally mediated cortical influences on the autonomic nervous system, expressed as HRV, affects the immune system by adrenergic stimulation and cholinergic inhibition of cytokine production in macrophages and neutrophils. Previous findings indicate that low HRV is associated with increased production of the pro-inflammatory cytokines IL-6 and TNF-α. IL-6 and TNF-α can activate the NFκB pathway, increasing production of reactive oxygen species that can cause DNA damage. Vagally mediated HRV has been related to an individual’s ability to regulate stress, and is lower in people with shorter telomeres. Based on these previous findings, the NISIM suggest that the main pathway from psychological stress to individual differences in oxidative telomere damage originates in the neuroanatomical components that modulate HRV, and culminates in the cytokine-induced activation of NFκB. Accumulated senescent cells in the brain is hypothesized to promote age-related neurodegenerative disease, and previous reports suggest an association between low HRV and onset of Alzheimer’s and Parkinson’s disease. Accumulating senescent cells in peripheral tissues secreting senescence-associated secretory phenotype factors can alter tissue structure and function which can induce cancer and promote tumor growth and metastasis in old age, and previous research suggested that ability to regulate psychological stress has a negative association with cancer onset. We therefore conclude that the NISIM can account for a large proportion of the individual differences in the psychological stress-related antecedents to cellular senescence, and suggest that it can be useful in providing a dynamic framework for understanding the pathways by which psychological stress induce pathologies in old age

Mindfulness and self-efficacy in pain perception, stress and academic performance. The influence of mindfulness on cognitive processes

Purpose: This study seeks to understand the mediating effects of mindfulness on selfefficacy, academic performance and ability to cope with pain. It further examines the effect of mindfulness on the capacity to cope with pain-induced stress. Whilst there are physiological changes which occur due to mindfulness, it is still not clearly understood how the mechanisms behind mindfulness work or whether the role of self-efficacy is an agent of mindfulness which may impact on performance and stress coping. Participants and methods: A three-part study (n=92) was conducted to test the relationship between mindfulness, self-efficacy and well-being factors, alongside academic performance in university students. Part one involved data collection one month prior to an experiment where trait scores for all factors were used to check pain and well-being behaviors. Part two consisted of participant randomization into three intervention groups(control, sham, mindfulness) and then an exposure to a fear induction task followed by cognitive tasks. The third part consisted of investigating the effect of a short mindfulness intervention on self-efficacy, pain and well-being in students. Results: The results indicate that self-efficacy had a positive effect on well-being factor (study 1 & 3) and in the experiment (study 2). Conclusion: Self-efficacy influenced pain intensity and pain unpleasantness and significantly predicted academic performance. Mindfulness had mixed results in how it influenced self-efficacy. While it influenced well-being and lowered stress (study 1 & 2) in the long term, the mindfulness intervention significantly decreased self efficacy.acceptedVersionpublishedVersio

Cognisance as a Human Factor in Military Cyber Defence Education

The authors may share the final published article on public non-commercial sites in the terms of the Creative Commons CC-BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/. Additionally, the authors may use the article in a subsequent compilation of their work, or extend it to book length form, or include it in a thesis or dissertation, or otherwise to use or re-use portions or excerpts in other works, for both commercial and non-commercial purposes. All copies of the article should link to the original publication in IFAC PapersOnline via its DOI and have a copyright statement and a reference to the CC-BY-NC-ND license. Except for such uses, IFAC has the exclusive right to make or sub-license commercial useCyber Defence Exercises (CDX) are common training and learning tools. A recently discussed challenge in cyber defence teaching and training is the gap between the fast technological advancement accompanied by rapidly changing demands on future cyber defence operators, and the lack of science-based teaching and training methods. A growing body of evidence suggests a crucial role of human factors as a central predictor for human performance in sociotechnical systems. While this has been acknowledged in a wide range of safety-critical applied fields, there is still a lack of knowledge about the impact of human factors on cyber defence performance. The lack of conventional metrics of performance and learning progress contribute to this deficit. To address this gap, the Norwegian Defence Cyber Academy (NDCA) follows a science-based educational approach that identified in a series of empirical studies cognitive-psychological predictors for learning success of future cyber defence operators. These predictors and elements of a human factors research program are deeply embedded into educational practice and include processes such as metacognition, self-regulation, coping, communication and shared mental modelling. Slow education methods and mentoring are fundamental to enabling the advancement of human factors cognisance among military cyber cadets. As a tool for efficient training, the NDCA developed and implemented a mentoring concept that involves a cyber defence retrospective timeline analysis involving expert and practitioner level mentors. The timeline differentiates between performance relevant hard-and soft-skills and leads progressively towards an alignment of Security Operation Centre (SOC)-and expert judgments of performance. The NDCA argues that this educational concept facilitates educational benefits based on insight, accurate self-perception, motivation and decreased team workloads following more efficient collaboration.publishedVersio

Response Inhibition and Memory Retrieval of Emotional Target Words: Evidence from an Emotional Stop-Signal Task

Previous research suggests that emotional stimuli capture attention and guide behavior often automatically. The present study investigated the relationship between emotion-driven attention capture and motor response inhibition to emotional words in the stop-signal task. By experimental variations of the onset of motor response inhibition across the time-course of emotional word processing, we show that processing of emotional information significantly interferes with motor response inhibition in an early time-window, previously related to automatic emotion-driven attention capture. Second, we found that stopping reduced memory recall for unpleasant words during a subsequent surprise free recall task supporting assumptions of a link between mechanisms of motor response inhibition and memory functions. Together, our results provide behavioral evidence for dual competition models of emotion and cognition. This study provides an important link between research focusing on different sub-processes of emotion processing (from perception to action and from action to memory)

A Critical View of the National Student Survey as a Quality Indicator in Norwegian Higher Education

Student surveys are an integral part of quality assessment in the education sector and play a vital role in the justification of policies and decisions on governmental, institutional and individual levels. Each year in Norway a governmental agency for quality assurance in education conducts a national survey inviting all registered second year bachelor’s and master’s students to provide online feedback on their perceived study quality. We discuss the limits of the results' interpretability in the light of previous research criticising the validity of student surveys for the assessment of educational quality in general and discuss in more detail the limitations in the chosen Norwegian example. This article aims to increase the awareness of these challenges and stimulate a science-based development of alternative assessment forms of educational quality. The relationship between the educational sector's core activity and the survey's focus is discussed; suggestions for paths to improvement are made. We argue further that the nationwide assessment lays bare the conceptual deficits that may be of equally high importance for educational system evaluations in other countries.publishedVersio

Effects of music on agitation in dementia: A meta-analysis

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A Multilevel Investigation of Resiliency Scales for Children and Adolescents: The Relationships Between Self-Perceived Emotion Regulation, Vagally Mediated Heart Rate Variability, and Personal Factors Associated With Resilience

Personal resiliency refers to individual attributes that are related to the process of successfully adapting to the environment in the face of adverse conditions, also known as resilience. Emotion regulation is increasingly found as a core component in mental health and found to modulate individual differences in the management of emotional responses. The Resiliency Scales for Children and Adolescents (RSCA; Prince-Embury, 2006, 2007) were designed to systematically identify and quantify core personal qualities of resiliency in youth, and includes Sense of Mastery scale (MAS), Sense of Relatedness scale (REL), and Emotional Reactivity (REA) scale. The following study was first conducted to confirm the Three-Factor model of Personal Resiliency in a Norwegian student sample using factor analytic procedures. Secondly and the main purpose of the study, was to investigate if personal resiliency is associated with self-reported measures related to emotion regulation, and with resting vagally mediated heart rate variability (vmHRV) as a psychophysiological index of emotion regulation capacity. A revised scale adapted to the Norwegian sample was developed. Results indicate that protective indices related to personal resiliency are associated with both self-reported adaptive emotion regulation and outcome, and partly related to high capacity for emotion regulation indicated by vmHRV. Risk related to personal vulnerability was associated with maladaptive emotion regulation and outcome, but was not associated with emotion regulation capacity. Together the findings provide supporting evidence of both self-reported and psychophysiological correlates between emotion regulatory processes and personal resiliency indicated by RSCA