1,691 research outputs found
The accessibility dimension for structured document retrieval
Structured document retrieval aims at retrieving the document components that best satisfy a query, instead of merely retrieving pre-defined document units. This paper reports on an investigation of a tf-idf-acc approach, where tf and idf are the classical term frequency and inverse document frequency, and acc, a new parameter called accessibility, that captures the structure of documents. The tf-idf-acc approach is defined using a probabilistic relational algebra. To investigate the retrieval quality and estimate the acc values, we developed a method that automatically constructs diverse test collections of structured documents from a standard test collection, with which experiments were carried out. The analysis of the experiments provides estimates of the acc values
The Future is Big Graphs! A Community View on Graph Processing Systems
Graphs are by nature unifying abstractions that can leverage
interconnectedness to represent, explore, predict, and explain real- and
digital-world phenomena. Although real users and consumers of graph instances
and graph workloads understand these abstractions, future problems will require
new abstractions and systems. What needs to happen in the next decade for big
graph processing to continue to succeed?Comment: 12 pages, 3 figures, collaboration between the large-scale systems
and data management communities, work started at the Dagstuhl Seminar 19491
on Big Graph Processing Systems, to be published in the Communications of the
AC
An event-driven approach to dynamic situation detection
To cope with the emerging demand for individual products and services, new approaches for handling the individualization in dynamic supply chains are needed. Our object of investigation is to establish Situation-awareness (SA) in an assistant information system for supply chain partners to cope with individualization-driven demands. Our contribution is an event-driven architecture design to enable situational planning using the Situation Calculus upon distributed contextual information. Sensors raise events among supply chain partner’s information systems, which are combined to context events in order to derive situations on partner level. Our works follows the Design Science in Information Systems Research to design and evaluate the architecture design. The preliminary descriptive evaluation uses life stock transports as an example
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Topology-based protein structure comparison using a pattern discovery technique
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A computer system to perform structure comparison using TOPS representations of protein structure
We describe the design and implementation of a fast topology–based method
for protein structure comparison. The approach uses the TOPS topological representation
of protein structure, aligning two structures using a common discovered
pattern and generating measure of distance derived from an insert score. Heavy
use is made of a constraint-based pattern matching algorithm for TOPS diagrams
that we have designed and described elsewhere Gilbert et al. (1999). The comparison
system is maintained at the European Bioinformatics Institute and is available
over the Web via the at tops.ebi.ac.uk/tops. Users submit a structure description in
Protein Data Bank (PDB) format and can compare it with structures in the entire
PDB or a representative subset of protein domains, receiving the results by email
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