W. Hofman
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14 records found
1
Government Accessing Business Data for Compliance Monitoring of Circular Economy
DATAPIPE White paper
Digital Infrastructures for Compliance Monitoring of Circular Economy
Requirements for Interoperable Data Spaces
Innovative Data Analytics, Data Sources, and Architecture for European Customs Risk Management
D8.8 Policy, Research and Standardization Recommendations
https://ec.europa.eu/research/participants/documents/downloadPublic?documentIds=080166e5f1716216&appId=PPGMS
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https://ec.europa.eu/research/participants/documents/downloadPublic?documentIds=080166e5f1716216&appId=PPGMS
Using Business Data in Customs Risk Management
Data Quality and Data Value Perspective
Ontology alignment is a fundamental task to reconcile the heterogeneity among various information systems using distinct information sources. The evolutionary algorithms (EAs) have been already considered as the primary strategy to develop an ontology alignment system. However, such systems have two significant drawbacks: they either need a ground truth that is often unavailable, or they utilize the population-based EAs in a way that they require massive computation and memory. This article presents a new ontology alignment system, called SANOM, which uses the well-known simulated annealing as the principal technique to find the mappings between two given ontologies while no ground truth is available. In contrast to population-based EAs, the simulated annealing need not generate populations, which makes it significantly swift and memory-efficient for the ontology alignment problem. This article models the ontology alignment problem as optimizing the fitness of a state whose optimum is obtained by using the simulated annealing. A complex fitness function is developed that takes advantage of various similarity metrics including string, linguistic, and structural similarities. A randomized warm initialization is specially tailored for the simulated annealing to expedite its convergence. The experiments illustrate that SANOM is competitive with the state-of-the-art and is significantly superior to other EA-based systems.
Simulated annealing-based ontology matching (SANOM) participates for the second time at the ontology alignment evaluation initiative (OAEI) 2019. This paper contains the configuration of SANOM and its results on the anatomy and conference tracks. In comparison to the OAEI 2017, SANOM has improved significantly, and its results are competitive with the state-of-the-art systems. In particular, SANOM has the highest recall rate among the participated systems in the conference track, and is competitive with AML, the best performing system, in terms of F-measure. SANOM is also competitive with LogMap on the anatomy track, which is the best performing system in this track with no usage of particular biomedical background knowledge. SANOM has been adapted to the HOBBIT platfrom and is now available for the registered users. abstract environment.
Comparing ontology matching systems are typically performed by comparing their average performances over multiple datasets. However, this paper examines the alignment systems using statistical inference since averaging is statistically unsafe and inappropriate. The statistical tests for comparison of two or multiple alignment systems are theoretically and empirically reviewed. For comparison of two systems, the Wilcoxon signed-rank and McNemar's mid-p and asymptotic tests are recommended due to their robustness and statistical safety in different circumstances. The Friedman and Quade tests with their corresponding post-hoc procedures are studied for comparison of multiple systems, and their [dis]advantages are discussed. The statistical methods are then applied to benchmark and multifarm tracks from the ontology matching evaluation initiative (OAEI) 2015 and their results are reported and visualized by critical difference diagrams.
Ontology alignment is widely used to find the correspondences between different ontologies in diverse fields. After discovering the alignments, several performance scores are available to evaluate them. The scores typically require the identified alignment and a reference containing the underlying actual correspondences of the given ontologies. The current trend in the alignment evaluation is to put forward a new score (e.g., precision, weighted precision, semantic precision, etc.) and to compare various alignments by juxtaposing the obtained scores. However, it is substantially provocative to select one measure among others for comparison. On top of that, claiming if one system has a better performance than one another cannot be substantiated solely by comparing two scalars. In this article, we propose the statistical procedures that enable us to theoretically favor one system over one another. The McNemar's test is the statistical means by which the comparison of two ontology alignment systems over one matching task is drawn. The test applies to a 2 × 2 contingency table, which can be constructed in two different ways based on the alignments, each of which has their own merits/pitfalls. The ways of the contingency table construction and various apposite statistics from the McNemar's test are elaborated in minute detail. In the case of having more than two alignment systems for comparison, the family wise error rate is expected to happen. Thus, the ways of preventing such an error are also discussed. A directed graph visualizes the outcome of the McNemar's test in the presence of multiple alignment systems. From this graph, it is readily understood if one system is better than one another or if their differences are imperceptible. The proposed statistical methodologies are applied to the systems participated in the OAEI 2016 anatomy track, and also compares several well-known similarity metrics for the same matching problem.
The l1-regularized least square problem has been considered in diverse fields. However, finding its solution is exacting as its objective function is not differentiable. In this paper, we propose a new one-layer neural network to find the optimal solution of the l1-regularized least squares problem. To solve the problem, we first convert it into a smooth quadratic minimization by splitting the desired variable into its positive and negative parts. Accordingly, a novel neural network is proposed to solve the resulting problem, which is guaranteed to converge to the solution of the problem. Furthermore, the rate of the convergence is dependent on a scaling parameter, not to the size of datasets. The proposed neural network is further adjusted to encompass the total variation regularization. Extensive experiments on the l1 and total variation regularized problems illustrate the reasonable performance of the proposed neural network.
Ontology matching evaluation
A statistical perspective
user owned data. All will prosper by sharing as much data as they are willing, thus interoperability amongst providers is required. An architecture in which a citizen not only can own its data, maintain its social network and sells its data to advertisers, but also provides data to authorities to apply for particular government services, addresses both dat but in some occasions also on subscriptions a privacy challenges and eGovernment services. Authorities can play an important role by stimulating the implementation of a Social Web Ontology, initiate the development of data privacy monitoring modules warning users of potential privacy issues when selling data, and base public services on the Social Web Ontology. It will also allow users to present themselves differently in different contexts based on access control settings, e.g. private, professional, and citizen. ...
user owned data. All will prosper by sharing as much data as they are willing, thus interoperability amongst providers is required. An architecture in which a citizen not only can own its data, maintain its social network and sells its data to advertisers, but also provides data to authorities to apply for particular government services, addresses both dat but in some occasions also on subscriptions a privacy challenges and eGovernment services. Authorities can play an important role by stimulating the implementation of a Social Web Ontology, initiate the development of data privacy monitoring modules warning users of potential privacy issues when selling data, and base public services on the Social Web Ontology. It will also allow users to present themselves differently in different contexts based on access control settings, e.g. private, professional, and citizen.