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Interactive Time Series Subsequence Matching
(Springer, 2017)We develop a highly efficient access method, called Delta-Top-Index, to answer top-k subsequence matching queries over a time series data set. Compared to a naive implementation, our index has a storage cost that is up to ... -
Automating assessment of exercises as means to decrease MOOC teachers’ efforts
(Springer Science and Business Media Deutschland GmbH, 2018)To increase digital fluency in adult population, efforts have included offering e-learning initiatives and MOOCs, and more efforts should be undertaken in order to facilitate MOOC implementation and to widen MOOC participation. ... -
Hybrid Best-First Greedy Search for Orienteering with Category Constraints
(Springer, 2017)We develop an approach for solving rooted orienteering problems with category constraints as found in tourist trip planning and logistics. It is based on expanding partial solutions in a systematic way, prioritizing promising ... -
Sweeping-Based Temporal Aggregation
(Springer, 2017)The Timeline Index, which supports temporal joins, time travel, and temporal aggregation on constant intervals, has the potential of becoming a universal index for temporal database systems. Here we present a family of ... -
Itinerary Planning with Category Constraints Using a Probabilistic Approach
(Springer, 2017)We propose a probabilistic approach for finding approximate solutions to rooted orienteering problems with category constraints. The basic idea is to select nodes from the input graph according to a probability distribution ... -
An Interactive Framework for Video Surveillance Event Detection and Modeling
(ACM, 2017)We present a framework for high-level event detection in video streams based on a novel temporal extension of relational algebra. With the help of intuitive and interactive graphical user interfaces, a user can have a look ... -
PIEJoin: Towards Parallel Set Containment Joins
(ACM, 2016)The efficient computation of set containment joins (SCJ) over set-valued attributes is a well-studied problem with many applications in commercial and scientific fields. Nevertheless, there still exists a number of open ... -
Labeling the Frames of a Video Stream with Interval Events
(IEEE, 2017)We propose a framework for detecting medium-level events referring to intervals of frames of a video stream. The detected events can serve as input for an earlier developed framework detecting high-level surveillance events. ... -
A Platform for Edge Computing Based on Raspberry Pi Clusters
(Springer, 2017)Small credit-card-sized single-board computers, such as the Raspberry Pi, are becoming ever more popular in areas unrelated to the education of children, for which they were originally intended. So far, these computers ...