Ontology-based data access: An application to intermodal logistics

Abstract

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Ontologies in System Engineering: A Field Report

“…As we can observe in Figure 3, OBDA-based solutions show higher overall computation times than the RDB-based solution -from 1 to 2 orders of magnitude -together with an apparently growing trend associated to the time span of the simulation. However, as we have shown in [4], a trend test performed on the results obtained with the best OBDA solutions for various KPIs, displays no statistically significant increase in the CPU time required to answer various queries with respect to the number of days. Considering that for most KPIs we can adopt an "eager" solution similar to that considered in Section 3, we can conclude that OBDA is practically feasible for monitoring medium-to-large scale systems.…”

“…Scenarios are simulated for an increasing number of days to evaluate scalability, and all of them share common settings as far as number of train travels, number of cars per train, and timetabling are concerned. Unexpected delays as well as the number of customers per terminal follow a probabilistic model -see [4] for more details. In Figure 3 we display the results 5 obtained in the case of an heavy utilization scenario to compute a specific KPI, namely the average number of ITUs unloaded per hour.…”

“…The first case study is about an on-board rolling-stock condition analyzer, i.e., a system to perform fault detection and classification [3]. The second one is about monitoring an intermodal logistic system [4]. The third one is about an ontology-based framework to generate diagnostic-decision support systems [5].…”

“…Ontologies for system monitoring. In [4] we provided strong evidence of practical uses for ontologies in complex systems engineering by implementing a monitor for Intermodal Logistics Systems (ILSs), i.e., systems supporting the movement of containerized goods. In particular, we considered combination of rail and road transport, where rail transport is provided by short-distance shuttle trains, and network coverage is achieved through connections at specialized terminals.…”

ECMS 2021 Proceedings edited by Khalid Al-Begain, Mauro Iacono, Lelio Campanile, Andrzej Bargiela

“…The simulator models an Intermodal Logistics System (ILS) which support receiving, storing and shipping goods packaged in Intermodal Transport Units (ITUs, also known as "containers"). A detailed description of the context is provided in [CCT13]. Here we restrict our attention to ILSs wherein rail transportation is supported by a network of terminals equipped with systems for fast ITU handling.…”