3,044 research outputs found
An Analytics Platform for Integrating and Computing Spatio-Temporal Metrics
In large-scale context-aware applications, a central design concern is capturing, managing
and acting upon location and context data. The ability to understand the collected data and define
meaningful contextual events, based on one or more incoming (contextual) data streams, both for
a single and multiple users, is hereby critical for applications to exhibit location- and context-aware
behaviour. In this article, we describe a context-aware, data-intensive metrics platform —focusing
primarily on its geospatial support—that allows exactly this: to define and execute metrics, which
capture meaningful spatio-temporal and contextual events relevant for the application realm.
The platform (1) supports metrics definition and execution; (2) provides facilities for real-time,
in-application actions upon metrics execution results; (3) allows post-hoc analysis and visualisation
of collected data and results. It hereby offers contextual and geospatial data management and
analytics as a service, and allow context-aware application developers to focus on their core
application logic. We explain the core platform and its ecosystem of supporting applications and
tools, elaborate the most important conceptual features, and discuss implementation realised through
a distributed, micro-service based cloud architecture. Finally, we highlight possible application fields,
and present a real-world case study in the realm of psychological health
Internet of things
Manual of Digital Earth / Editors: Huadong Guo, Michael F. Goodchild, Alessandro Annoni .- Springer, 2020 .- ISBN: 978-981-32-9915-3Digital Earth was born with the aim of replicating the real world within the digital world. Many efforts have been made to observe and sense the Earth, both from space (remote sensing) and by using in situ sensors. Focusing on the latter, advances in Digital Earth have established vital bridges to exploit these sensors and their networks by taking location as a key element. The current era of connectivity envisions that everything is connected to everything. The concept of the Internet of Things(IoT)emergedasaholisticproposaltoenableanecosystemofvaried,heterogeneous networked objects and devices to speak to and interact with each other. To make the IoT ecosystem a reality, it is necessary to understand the electronic components, communication protocols, real-time analysis techniques, and the location of the objects and devices. The IoT ecosystem and the Digital Earth (DE) jointly form interrelated infrastructures for addressing today’s pressing issues and complex challenges. In this chapter, we explore the synergies and frictions in establishing an efficient and permanent collaboration between the two infrastructures, in order to adequately address multidisciplinary and increasingly complex real-world problems. Although there are still some pending issues, the identified synergies generate optimism for a true collaboration between the Internet of Things and the Digital Earth
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Eye Tracking Support for Visual Analytics Systems
Visual analytics (VA) research provides helpful solutions for interactive visual data analysis when exploring large and complex datasets. Due to recent advances in eye tracking technology, promising opportunities arise to extend these traditional VA approaches. Therefore, we discuss foundations for eye tracking support in VA systems. We first review and discuss the structure and range of typical VA systems. Based on a widely used VA model, we present five comprehensive examples that cover a wide range of usage scenarios. Then, we demonstrate that the VA model can be used to systematically explore how concrete VA systems could be extended with eye tracking, to create supportive and adaptive analytics systems. This allows us to identify general research and application opportunities, and classify them into research themes. In a call for action, we map the road for future research to broaden the use of eye tracking and advance visual analytics
Towards Ubiquitous Semantic Metaverse: Challenges, Approaches, and Opportunities
In recent years, ubiquitous semantic Metaverse has been studied to
revolutionize immersive cyber-virtual experiences for augmented reality (AR)
and virtual reality (VR) users, which leverages advanced semantic understanding
and representation to enable seamless, context-aware interactions within
mixed-reality environments. This survey focuses on the intelligence and
spatio-temporal characteristics of four fundamental system components in
ubiquitous semantic Metaverse, i.e., artificial intelligence (AI),
spatio-temporal data representation (STDR), semantic Internet of Things (SIoT),
and semantic-enhanced digital twin (SDT). We thoroughly survey the
representative techniques of the four fundamental system components that enable
intelligent, personalized, and context-aware interactions with typical use
cases of the ubiquitous semantic Metaverse, such as remote education, work and
collaboration, entertainment and socialization, healthcare, and e-commerce
marketing. Furthermore, we outline the opportunities for constructing the
future ubiquitous semantic Metaverse, including scalability and
interoperability, privacy and security, performance measurement and
standardization, as well as ethical considerations and responsible AI.
Addressing those challenges is important for creating a robust, secure, and
ethically sound system environment that offers engaging immersive experiences
for the users and AR/VR applications.Comment: 18 pages, 7 figures, 3 table
Physics-Based and Data-Driven Analytics for Enhanced Planning and Operations in Power Systems with Deep Renewable Penetration
This dissertation is motivated by the lack of combined physics-based and data-driven
framework for solving power system challenges that are introduced by the integration of
new devices and new system components. As increasing number of stochastic generation,
responsive loads, and dynamic measurements are involved in the planning and operations
of modern power systems, utilities and system operators are in great need of new analysis
framework that could combine physical models and measuring data together for solving
challenging planning and operational problems.
In view of the above challenges, the high-level objective of this dissertation is to develop
a framework for integrating measurement data into large physical systems modeled
by dynamical equations. To this end, the dissertation first identifies four critical tasks
for the planning and operations of the modern power systems: the data collection and
pre-processing, the system situational awareness, the decision making process, as well as
the post-event analysis. The dissertation then takes one concrete application in each of
these critical tasks as the example, and proposes the physics-based/data-driven approach
for solving the challenging problems faced by this specific application.
To this end, this dissertation focuses on solving the following specific problems using
physics-based/data-driven approaches. First, for the data collection and pre-processing
platform, a purely data-driven approach is proposed to detect bad metering data in the
phasor measurement unit (PMU) monitoring systems, and ensure the overall PMU data
quality. Second, for the situational awareness platform, a physics-based voltage stability
assessment method is presented to improve the situational awareness of system voltage
instabilities. Third, for the decision making platform, a combined physics-based and
data-driven framework is proposed to support the decision making process of PMU-based
power plant model validation. Forth, for the post-event analysis platform, a physics-based
post-event analysis is presented to identify the root causes of the sub-synchronous oscillations
induced by the wind farm integration.
The above problems and proposed solutions are discussed in detail in Section 2 through
Section 5. The results of this work can be integrated to address practical problems in
modern power system planning and operations
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