3,316 research outputs found

    Quantifying Variation in Gait Features from Wearable Inertial Sensors Using Mixed Effects Models

    Get PDF
    The emerging technology of wearable inertial sensors has shown its advantages in collecting continuous longitudinal gait data outside laboratories. This freedom also presents challenges in collecting high-fidelity gait data. In the free-living environment, without constant supervision from researchers, sensor-based gait features are susceptible to variation from confounding factors such as gait speed and mounting uncertainty, which are challenging to control or estimate. This paper is one of the first attempts in the field to tackle such challenges using statistical modeling. By accepting the uncertainties and variation associated with wearable sensor-based gait data, we shift our efforts from detecting and correcting those variations to modeling them statistically. From gait data collected on one healthy, non-elderly subject during 48 full-factorial trials, we identified four major sources of variation, and quantified their impact on one gait outcome‚ÄĒrange per cycle‚ÄĒusing a random effects model and a fixed effects model. The methodology developed in this paper lays the groundwork for a statistical framework to account for sources of variation in wearable gait data, thus facilitating informative statistical inference for free-living gait analysis

    Global stability in a diffusive Holling-Tanner predator-prey model

    Get PDF
    A diffusive Holling-Tanner predator-prey model with no-flux boundary condition is considered, and it is proved that the unique constant equilibrium is globally asymptotically stable under a new simpler parameter condition. (C) 2011 Elsevier Ltd. All rights reserved

    Exploring Urban Spaces across Human-Natural systems and the Potential to Enhance City Resilience

    Get PDF
    In dieser Dissertation werden vier Studien durchgef√ľhrt, um die acht Arten von R√§umen in Mensch-Natur-Systemen f√ľr die Widerstandsf√§higkeit von St√§dten vorzuschlagen, die Verbesserung von st√§dtischen Gr√ľnfl√§chen unter qualitativen und quantitativen Gesichtspunkten zu analysieren, die Beziehung zwischen UGSLandschaftsmerkmalen und menschlichen Emotionen zu bestimmen und das Konzept der selbstlernenden Stadt f√ľr die st√§dtische Raumplanung zu veranschaulichen. (1). Unterschiedliche Strategien in den Acht-Typen-R√§umen in Mensch-Natur-Systemen. (2). Verbesserung der st√§dtischen Gr√ľnfl√§chen mit nat√ľrlichem Angebot und menschlicher Nachfrage. (3). Das Konzept der selbstlernenden Stadt f√ľr urbane Nachhaltigkeit. (4) F√ľr die st√§dtische Nachhaltigkeit erfordert die Planung eine Neubewertung der Verbindungen zwischen den verschiedenen menschlichen und nat√ľrlichen Systemen mit den Wechselwirkungen zwischen Bedarf und Versorgung St√§dtische R√§ume sind komplex, weisen aber in verschiedenen Methoden und Konzepten Regelm√§√üigkeiten auf. F√ľr eine nachhaltige Entwicklung in St√§dten sind kreative Denkans√§tze f√ľr die Umsetzung und Integration von sich √ľberschneidenden R√§umen, Elementen und Kulturen in st√§dtischen Mensch-Natur-Systemen erforderlich. Um eine nachhaltige Stadt zu schaffen, sind urbane R√§ume unerl√§sslich.This dissertation conducts four studies to propose the eight-type spaces in human-natural systems for city resilience, to analyze the improvement of urban green spaces from quality and quantity perspectives, to determine the relationship between UGS landscape characteristics and human emotions and to illustrate the concept of city self-learning for urban space planning. (1). Different strategies in the eight-type spaces across human-natural systems. (2). Improving urban green spaces with natural supply and human demand. (3). The concept of city self-learning for urban sustainability. (4) For urban sustainability, planning requires reevaluating the connections between different human-natural systems with the interactions of demands and supplies. Dissertation title: Exploring Urban Spaces across Human-Natural systems And the Potential to Enhance City Resilience Urban spaces are complex but have regularity in several methods and concepts. For sustainable development in cities, creative ways to think about implementations and integrations utilize crossing spaces, elements, and cultures in urban human-natural systems. To make a sustainable city, urban spaces are essential
    • ‚Ķ
    corecore