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Article
Open AccessRobust and scalable content-and-structure indexing
Frequent queries on semi-structured hierarchical data are Content-and-Structure (CAS) queries that filter data items based on their location in the hierarchical structure and their value for some attribute. We...
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Article
Open AccessCache-efficient swee**-based interval joins for extended Allen relation predicates
We develop a family of efficient plane-swee** interval join algorithms for evaluating a wide range of interval predicates such as Allen’s relationships and parameterized relationships. Our technique is based...
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Article
Open AccessStructural textile pattern recognition and processing based on hypergraphs
The humanities, like many other areas of society, are currently undergoing major changes in the wake of digital transformation. However, in order to make collection of digitised material in this area easily ac...
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Chapter and Conference Paper
Inserting Keys into the Robust Content-and-Structure (RCAS) Index
Semi-structured data is prevalent and typically stored in formats like XML and JSON. The most common type of queries on such data are Content-and-Structure (CAS) queries, and a number of CAS indexes have been ...
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Article
Open AccessWhat is meaningful research and how should we measure it?
We discuss the trend towards using quantitative metrics for evaluating research. We claim that, rather than promoting meaningful research, purely metric-based research evaluation schemes potentially lead to a ...
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Article
Open AccessA Blockchain-based Decentralized Electronic Marketplace for Computing Resources
We propose a framework for building a decentralized electronic marketplace for computing resources. The idea is that anyone with spare capacities can offer them on this marketplace, opening up the cloud comput...
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Chapter and Conference Paper
High-Level Automatic Event Detection and User Classification in a Social Network Context
We present a framework for high-level automatic event detection and user classification in a social network context based on a novel temporal extension of relational algebra, which improves and extends our ear...
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Chapter and Conference Paper
Automating Assessment of Exercises as Means to Decrease MOOC Teachers’ Efforts
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 ...
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Chapter and Conference Paper
EthernityDB – Integrating Database Functionality into a Blockchain
We develop EthernityDB, a system that integrates database functionality into an Ethereum blockchain. In contrast to other systems, in our approach all the data is kept on the chain, giving us all the guarantee...
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Chapter and Conference Paper
A Platform for Edge Computing Based on Raspberry Pi Clusters
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 ...
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Chapter and Conference Paper
Hybrid Best-First Greedy Search for Orienteering with Category Constraints
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, priori...
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Chapter and Conference Paper
Itinerary Planning with Category Constraints Using a Probabilistic Approach
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 probabilit...
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Chapter and Conference Paper
Interactive Time Series Subsequence Matching
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 naïve implementation, our index has a storage cost that...
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Chapter and Conference Paper
Swee**-Based Temporal Aggregation
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 ...
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Chapter and Conference Paper
Using Time-Sensitive Rooted PageRank to Detect Hierarchical Social Relationships
We study the problem of detecting hierarchical ties in a social network by exploiting the interaction patterns between the actors (members) involved in the network. Motivated by earlier work using a rank-based...
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Article
Measuring structural similarity of semistructured data based on information-theoretic approaches
We propose and experimentally evaluate different approaches for measuring the structural similarity of semistructured documents based on information-theoretic concepts. Common to all approaches is a two-step p...
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Book
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Chapter
Introduction to Reasoning in Event-Based Distributed Systems
Event-based distributed systems have played an important role in distributed computing in the recent past and their influence is steadily increasing. With the rapid development of Internet technologies, such s...
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Chapter and Conference Paper
Towards Building a Knowledge Base for Research on Andean Weaving
We are working on a knowledge base to store 3D Andean textile patterns together with rich cultural and historic context information. This will allow ontological studies in museum collections as well as on ethn...
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Chapter and Conference Paper
On the Termination Problem for Declarative XML Message Processing
We define a formal syntax and semantics for the Rule Definition Language (RDL) of DemaqLite, which is a fragment of the declarative XML message processing system Demaq. Based on this definition, we prove that ...
