609 research outputs found
Metrics for Measuring Data Quality - Foundations for an Economic Oriented Management of Data Quality
The article develops metrics for an economic oriented management of data quality. Two data quality dimensions are focussed: consistency and timeliness. For deriving adequate metrics several requirements are stated (e. g. normalisation, cardinality, adaptivity, interpretability). Then the authors discuss existing approaches for measuring data quality and illustrate their weaknesses. Based upon these considerations, new metrics are developed for the data quality dimensions consistency and timeliness. These metrics are applied in practice and the results are illustrated in the case of a major German mobile services provider
Layered evaluation of interactive adaptive systems : framework and formative methods
Peer reviewedPostprin
MAC protocols for low-latency and energy-efficient WSN applications
Most of medium access control (MAC) protocols proposed for wireless sensor
networks (WSN) are targeted only for single main objective, the energy
efficiency. Other critical parameters such as low-latency, adaptivity to
traffic conditions, scalability, system fairness, and bandwidth utilization
are mostly overleaped or dealt as secondary objectives. The demand to address
those issues increases with the growing interest in cheap, low-power, low-
distance, and embedded WSNs. In this report, along with other vital
parameters, we discuss suitability and limitations of different WSN MAC
protocols for time critical and energy-efficient applications. As an example,
we discuss the working of IEEE 802.15.4 in detail, explore its limitations,
and derive efficient application-specific network parameter settings for time,
energy, and bandwidth critical applications. Eventually, a new WSN MAC
protocol Asynchronous Real-time Energy-efficient and Adaptive MAC (AREA-MAC)
is proposed, which is intended to deal efficiently with time critical
applications, and at the same time, to provide a better trade-off between
other vital parameters, such as energy-efficiency, system fairness,
throughput, scalability, and adaptivity to traffic conditions. On the other
hand, two different optimization problems have been formulated using
application-based traffic generating scenario to minimize network latency and
maximize its lifetime
Production process stability - Core assumption of INDUSTRY 4.0 concept
Today's industrial enterprises are confronted by implementation of INDUSTRY 4.0 concept with basic problem - stabilised manufacturing and supporting processes. Through this phenomenon of stabilisation, they will achieve positive digital management of both processes and continuously throughput. There is required structural stability of horizontal (business) and vertical (digitized) manufacturing processes, supported through digitalised technologies of INDUSTRY 4.0 concept. Results presented in this paper based on the research results and survey realised in more industrial companies. Following will described basic model for structural process stabilisation in manufacturing environment. © Published under licence by IOP Publishing Ltd
An information adaptive system study report and development plan
The purpose of the information adaptive system (IAS) study was to determine how some selected Earth resource applications may be processed onboard a spacecraft and to provide a detailed preliminary IAS design for these applications. Detailed investigations of a number of applications were conducted with regard to IAS and three were selected for further analysis. Areas of future research and development include algorithmic specifications, system design specifications, and IAS recommended time lines
Learning and Management for Internet-of-Things: Accounting for Adaptivity and Scalability
Internet-of-Things (IoT) envisions an intelligent infrastructure of networked
smart devices offering task-specific monitoring and control services. The
unique features of IoT include extreme heterogeneity, massive number of
devices, and unpredictable dynamics partially due to human interaction. These
call for foundational innovations in network design and management. Ideally, it
should allow efficient adaptation to changing environments, and low-cost
implementation scalable to massive number of devices, subject to stringent
latency constraints. To this end, the overarching goal of this paper is to
outline a unified framework for online learning and management policies in IoT
through joint advances in communication, networking, learning, and
optimization. From the network architecture vantage point, the unified
framework leverages a promising fog architecture that enables smart devices to
have proximity access to cloud functionalities at the network edge, along the
cloud-to-things continuum. From the algorithmic perspective, key innovations
target online approaches adaptive to different degrees of nonstationarity in
IoT dynamics, and their scalable model-free implementation under limited
feedback that motivates blind or bandit approaches. The proposed framework
aspires to offer a stepping stone that leads to systematic designs and analysis
of task-specific learning and management schemes for IoT, along with a host of
new research directions to build on.Comment: Submitted on June 15 to Proceeding of IEEE Special Issue on Adaptive
and Scalable Communication Network
Adaptive User Interfaces for Intelligent E-Learning: Issues and Trends
Adaptive User Interfaces have a long history rooted in the emergence of such eminent technologies as Artificial Intelligence, Soft Computing, Graphical User Interface, JAVA, Internet, and Mobile Services. More specifically, the advent and advancement of the Web and Mobile Learning Services has brought forward adaptivity as an immensely important issue for both efficacy and acceptability of such services. The success of such a learning process depends on the intelligent context-oriented presentation of the domain knowledge and its adaptivity in terms of complexity and granularity consistent to the learner’s cognitive level/progress. Researchers have always deemed adaptive user interfaces as a promising solution in this regard. However, the richness in the human behavior, technological opportunities, and contextual nature of information offers daunting challenges. These require creativity, cross-domain synergy, cross-cultural and cross-demographic understanding, and an adequate representation of mission and conception of the task. This paper provides a review of state-of-the-art in adaptive user interface research in Intelligent Multimedia Educational Systems and related areas with an emphasis on core issues and future directions
- …