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https://www.readbyqxmd.com/read/28343985/functional-connectivity-dynamically-evolves-on-multiple-time-scales-over-a-static-structural-connectome-models-and-mechanisms
#1
REVIEW
Joana Cabral, Morten Kringelbach, Gustavo Deco
Over the last decade, we have observed a revolution in brain structural and functional Connectomics. On one hand, we have an ever-more detailed characterization of the brain's white matter structural connectome. On the other, we have a repertoire of consistent functional networks that form and dissipate over time during rest. Despite the evident spatial similarities between structural and functional connectivity, understanding how different time-evolving functional networks spontaneously emerge from a single structural network requires analyzing the problem from the perspective of complex network dynamics and dynamical system's theory...
March 23, 2017: NeuroImage
https://www.readbyqxmd.com/read/28340346/the-upsides-and-downsides-of-organelle-interconnectivity
#2
REVIEW
Daniel E Gottschling, Thomas Nyström
Interconnectivity and feedback control are hallmarks of biological systems. This includes communication between organelles, which allows them to function and adapt to changing cellular environments. While the specific mechanisms for all communications remain opaque, unraveling the wiring of organelle networks is critical to understand how biological systems are built and why they might collapse, as occurs in aging. A comprehensive understanding of all the routes involved in inter-organelle communication is still lacking, but important themes are beginning to emerge, primarily in budding yeast...
March 23, 2017: Cell
https://www.readbyqxmd.com/read/28318503/sociotechnical-systems-as-a-framework-for-regulatory-system-design-and-evaluation-using-work-domain-analysis-to-examine-a-new-regulatory-system
#3
Tony Carden, Natassia Goode, Gemma J M Read, Paul M Salmon
Like most work systems, the domain of adventure activities has seen a series of serious incidents and subsequent calls to improve regulation. Safety regulation systems aim to promote safety and reduce accidents. However, there is scant evidence they have led to improved safety outcomes. In fact there is some evidence that the poor integration of regulatory system components has led to adverse safety outcomes in some contexts. Despite this, there is an absence of methods for evaluating regulatory and compliance systems...
March 15, 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28316578/attractor-states-in-teaching-and-learning-processes-a-study-of-out-of-school-science-education
#4
Carla H Geveke, Henderien W Steenbeek, Jeannette M Doornenbal, Paul L C Van Geert
In order for out-of-school science activities that take place during school hours but outside the school context to be successful, instructors must have sufficient pedagogical content knowledge (PCK) to guarantee high-quality teaching and learning. We argue that PCK is a quality of the instructor-pupil system that is constructed in real-time interaction. When PCK is evident in real-time interaction, we define it as Expressed Pedagogical Content Knowledge (EPCK). The aim of this study is to empirically explore whether EPCK shows a systematic pattern of variation, and if so whether the pattern occurs in recurrent and temporary stable attractor states as predicted in the complex dynamic systems theory...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28302187/dynamical-systems-theory-in-quantitative-psychology-and-cognitive-science-a-fair-discrimination-between-deterministic-and-statistical-counterparts-is-required
#5
Adam Gadomski, Marcel Ausloos, Tahlia Casey
This article addresses a set of observations framed in both deterministic as well as statistical formal guidelines. It operates within the framework of nonlinear dynamical systems theory (NDS). It is argued that statistical approaches can manifest themselves ambiguously, creating practical discrepancies in psychological and cognitive data analyses both quantitatively and qualitatively. This is sometimes termed in literature as 'questionable research practices.' This communication points to the demand for a deeper awareness of the data 'initial conditions, allowing to focus on pertinent evolution constraints in such systems...
April 2017: Nonlinear Dynamics, Psychology, and Life Sciences
https://www.readbyqxmd.com/read/28288155/dynamics-robustness-of-cascading-systems
#6
Jonathan T Young, Tetsuhiro S Hatakeyama, Kunihiko Kaneko
A most important property of biochemical systems is robustness. Static robustness, e.g., homeostasis, is the insensitivity of a state against perturbations, whereas dynamics robustness, e.g., homeorhesis, is the insensitivity of a dynamic process. In contrast to the extensively studied static robustness, dynamics robustness, i.e., how a system creates an invariant temporal profile against perturbations, is little explored despite transient dynamics being crucial for cellular fates and are reported to be robust experimentally...
March 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28283352/the-s-c-ensory-immune-system-theory
#7
REVIEW
Henrique Veiga-Fernandes, António A Freitas
Viewpoints on the immune system have evolved across different paradigms, including the clonal selection theory, the idiotypic network, and the danger and tolerance models. Herein, we propose that in multicellular organisms, where panoplies of cells from different germ layers interact and immune cells are constantly generated, the behavior of the immune system is defined by the rules governing cell survival, systems physiology and organismic homeostasis. Initially, these rules were imprinted at the single cell-protist level, but supervened modifications in the transition to multicellular organisms...
March 7, 2017: Trends in Immunology
https://www.readbyqxmd.com/read/28280580/organization-of-biogeochemical-nitrogen-pathways-with-switch-like-adjustment-in-fluctuating-soil-redox-conditions
#8
Sanjay Lamba, Soumen Bera, Mubasher Rashid, Alexander B Medvinsky, Gui-Quan Sun, Claudia Acquisti, Amit Chakraborty, Bai-Lian Li
Nitrogen is cycled throughout ecosystems by a suite of biogeochemical processes. The high complexity of the nitrogen cycle resides in an intricate interplay between reversible biochemical pathways alternatively and specifically activated in response to diverse environmental cues. Despite aggressive research, how the fundamental nitrogen biochemical processes are assembled and maintained in fluctuating soil redox conditions remains elusive. Here, we address this question using a kinetic modelling approach coupled with dynamical systems theory and microbial genomics...
January 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28277437/developing-and-implementing-a-simulated-electronic-medication-administration-record-for-undergradute-nursing-education-using-sociotechnical-systems-theory-to-inform-practice-and-curricula
#9
(no author information available yet)
No abstract text is available yet for this article.
March 2017: Computers, Informatics, Nursing: CIN
https://www.readbyqxmd.com/read/28276582/ecological-factors-in-human-development
#10
William E Cross
Urie Bronfenbrenner (1992) helped developmental psychologists comprehend and define "context" as a rich, thick multidimensional construct. His ecological systems theory consists of five layers, and within each layer are developmental processes unique to each layer. The four articles in this section limit the exploration of context to the three innermost systems: the individual plus micro- and macrolayers. Rather than examine both the physical features and processes, the articles tend to focus solely on processes associated with a niche...
March 9, 2017: Child Development
https://www.readbyqxmd.com/read/28273856/time-prediction-models-for-echinococcosis-based-on-gray-system-theory-and-epidemic-dynamics
#11
Liping Zhang, Li Wang, Yanling Zheng, Kai Wang, Xueliang Zhang, Yujian Zheng
Echinococcosis, which can seriously harm human health and animal husbandry production, has become an endemic in the Xinjiang Uygur Autonomous Region of China. In order to explore an effective human Echinococcosis forecasting model in Xinjiang, three grey models, namely, the traditional grey GM(1,1) model, the Grey-Periodic Extensional Combinatorial Model (PECGM(1,1)), and the Modified Grey Model using Fourier Series (FGM(1,1)), in addition to a multiplicative seasonal ARIMA(1,0,1)(1,1,0)₄ model, are applied in this study for short-term predictions...
March 4, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28252000/homodyne-detection-of-short-range-doppler-radar-using-a-forced-oscillator-model
#12
Kunanon Kittipute, Peerayudh Saratayon, Suthasin Srisook, Paramote Wardkein
This article presents the homodyne detection in a self-oscillation system, which represented by a short-range radar (SRR) circuit, that is analysed using a multi-time forced oscillator (MTFO) model. The MTFO model is based on a forced oscillation perspective with the signal and system theory, a second-order differential equation, and the multiple time variable technique. This model can also apply to analyse the homodyne phenomenon in a difference kind of the oscillation system under same method such as the self-oscillation system, and the natural oscillation system with external forced...
March 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28249395/polynomial-time-solution-of-prime-factorization-and-np-complete-problems-with-digital-memcomputing-machines
#13
Fabio L Traversa, Massimiliano Di Ventra
We introduce a class of digital machines, we name Digital Memcomputing Machines, (DMMs) able to solve a wide range of problems including Non-deterministic Polynomial (NP) ones with polynomial resources (in time, space, and energy). An abstract DMM with this power must satisfy a set of compatible mathematical constraints underlying its practical realization. We prove this by making a connection with the dynamical systems theory. This leads us to a set of physical constraints for poly-resource resolvability. Once the mathematical requirements have been assessed, we propose a practical scheme to solve the above class of problems based on the novel concept of self-organizing logic gates and circuits (SOLCs)...
February 2017: Chaos
https://www.readbyqxmd.com/read/28248751/technological-complexity-have-we-reached-a-tipping-point
#14
Thomas R Clancy
As systems evolve over time, their natural tendency is to become increasingly more complex. Studies in the field of complex systems have generated new perspectives on the application of management strategies in health systems. Much of this research appears as a natural extension of the cross-disciplinary field of systems theory. This article focuses on why technological complexity is increasing and strategies nurse administrators can use to successfully implement change in the face of it.
April 2017: Journal of Nursing Administration
https://www.readbyqxmd.com/read/28241545/on-tilt-and-curvature-dependent-errors-and-the-calibration-of-coherence-scanning-interferometry
#15
Rong Su, Yuhang Wang, Jeremy Coupland, Richard Leach
Although coherence scanning interferometry (CSI) is capable of measuring surface topography with sub-nanometre precision, it is well known that the performance of measuring instruments depends strongly on the local tilt and curvature of the sample surface. Based on 3D linear systems theory, however, a recent analysis of fringe generation in CSI provides a method to characterize the performance of surface measuring instruments and offers considerable insight into the origins of these errors. Furthermore, from the measurement of a precision sphere, a process to calibrate and partially correct instruments has been proposed...
February 20, 2017: Optics Express
https://www.readbyqxmd.com/read/28230845/dynamic-models-of-large-scale-brain-activity
#16
REVIEW
Michael Breakspear
Movement, cognition and perception arise from the collective activity of neurons within cortical circuits and across large-scale systems of the brain. While the causes of single neuron spikes have been understood for decades, the processes that support collective neural behavior in large-scale cortical systems are less clear and have been at times the subject of contention. Modeling large-scale brain activity with nonlinear dynamical systems theory allows the integration of experimental data from multiple modalities into a common framework that facilitates prediction, testing and possible refutation...
February 23, 2017: Nature Neuroscience
https://www.readbyqxmd.com/read/28229248/promoting-social-nurturance-and-positive-social-environments-to-reduce-obesity-in-high-risk-youth
#17
REVIEW
Dawn K Wilson, Allison M Sweeney, Heather Kitzman-Ulrich, Haylee Gause, Sara M St George
Nurturing environments within the context of families, schools, and communities all play an important role in enhancing youth's behavioral choices and health outcomes. The increasing prevalence rates of obesity among youth, especially among low income and ethnic minorities, highlight the need to develop effective and innovative intervention approaches that promote positive supportive environments across different contexts for at-risk youth. We propose that the integration of Social Cognitive Theory, Family Systems Theory, and Self-Determination Theory offers a useful framework for understanding how individual, family, and social-environmental-level factors contribute to the development of nurturing environments...
March 2017: Clinical Child and Family Psychology Review
https://www.readbyqxmd.com/read/28226179/the-use-of-theory-in-family-therapy-research-content-analysis-and-update
#18
Ruoxi Chen, Alexandria C Hughes, Jason P Austin
In this study, we evaluated 275 empirical studies from Journal of Marital and Family Therapy and Family Process from 2010 to 2015 on their use of theory, and compared our findings to those of a similar previous analysis (Hawley & Geske, 2000). Overall, theory seems to have become much better incorporated in empirical family therapy research, with only 16.4% of the articles not using theory in either their introductory or discussion sections. Theory appeared better incorporated in the introductory sections than in the discussion sections...
February 22, 2017: Journal of Marital and Family Therapy
https://www.readbyqxmd.com/read/28222198/algorithmic-design-of-a-noise-resistant-and-efficient-closed-loop-deep-brain-stimulation-system-a-computational-approach
#19
Sofia D Karamintziou, Ana Luísa Custódio, Brigitte Piallat, Mircea Polosan, Stéphan Chabardès, Pantelis G Stathis, George A Tagaris, Damianos E Sakas, Georgia E Polychronaki, George L Tsirogiannis, Olivier David, Konstantina S Nikita
Advances in the field of closed-loop neuromodulation call for analysis and modeling approaches capable of confronting challenges related to the complex neuronal response to stimulation and the presence of strong internal and measurement noise in neural recordings. Here we elaborate on the algorithmic aspects of a noise-resistant closed-loop subthalamic nucleus deep brain stimulation system for advanced Parkinson's disease and treatment-refractory obsessive-compulsive disorder, ensuring remarkable performance in terms of both efficiency and selectivity of stimulation, as well as in terms of computational speed...
2017: PloS One
https://www.readbyqxmd.com/read/28218249/complexity-variability-assessment-of-nonlinear-time-varying-cardiovascular-control
#20
Gaetano Valenza, Luca Citi, Ronald G Garcia, Jessica Noggle Taylor, Nicola Toschi, Riccardo Barbieri
The application of complex systems theory to physiology and medicine has provided meaningful information about the nonlinear aspects underlying the dynamics of a wide range of biological processes and their disease-related aberrations. However, no studies have investigated whether meaningful information can be extracted by quantifying second-order moments of time-varying cardiovascular complexity. To this extent, we introduce a novel mathematical framework termed complexity variability, in which the variance of instantaneous Lyapunov spectra estimated over time serves as a reference quantifier...
February 20, 2017: Scientific Reports
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