Vagueness is often considered as an inherent property of spatiotemporal phenomena. In order to reduce this vagueness, integrity constraints should be defined to improve logical consistency of spatiotemporal databases. However, existing constraints are not adapted to control logical consistency of vague spatiotemporal objects because they are initially defined for crisp (or non–fuzzy) objects. W...

This paper defines a framework for the spatio-temporal analysis of motion imagery (MI) datasets depicting two-dimensional phenomena evolving in time. More specifically, we introduce the concept of a spatiotemporal helix as a concise representation of spatiotemporal events, modeling their path in space and the variations of their outline. We also present in some detail the automated algorithms d...

Spatiotemporal segmentation is an essential task for video analysis. The strong interconnection between finding an object’s spatial support and finding its motion characteristics makes the problem particularly challenging. Motivated by closure detection techniques in 2D images, this paper introduces the concept of spatiotemporal closure. Treating the spatiotemporal volume as a single entity, we...

The spatiotemporal dynamics of volume and surface positive negative streamers in a pin-to-plate dielectric barrier discharge is investigated this study. characteristics are found to be completely different for streamers. First, the spatial propagation streamer rely on electron avalanches caused by photoelectrons front head, whereas not case Second, our simulations reveal an interesting phenomen...

We provide a complete analysis, from theory to experiment, of the spontaneous emergence discretized conical wave X-type (i.e., localized 2D+1 space-time wavepacket) when an intense ultrashort pulse nonlinearly propagates in multimode fiber. In particular, we reveal that this spatiotemporal phenomenon corresponds broadband intermodal dispersive emission unsteady structure formed during nonlinear...

Previous research on spatiotemporal database were mainly focused on modeling, indexing, and query processing, and little work has be done in the implementation of spatiotemporal database management systems. In this paper, we present an extension of Oracle, named STOC (Spatio-Temporal Object Cartridge), to support spatiotemporal data management in a practical way. The extension is developed as a...

Most geographical phenomena, if not all of them, are essentially dynamic processes instead of static forms. The continuing advances of data acquisition and dissemination technologies have made available massive amounts of spatiotemporal data for the research of such dynamic processes. In the past decade, a surge of statistical models have been proposed in GIScience and related fields for modeli...

Interpolation and prediction of spatiotemporal data are integral components of many real-world applications. Thus, approaches of interpolating and predicting spatiotemporal data have been extensively investigated. Currently, the grey dynamic model has been used to enhance the performance of interpolating and predicting spatiotemporal data. Meanwhile, the Extensible Markup Language (XML) has uni...

BACKGROUND AND PURPOSE Persistent deficits in gait speed and spatiotemporal symmetry are prevalent following stroke and can limit the achievement of community mobility goals. Rehabilitation can improve gait speed, but has shown limited ability to improve spatiotemporal symmetry. The incorporation of combined visual and proprioceptive feedback regarding spatiotemporal symmetry has the potential ...