Laurens De Vocht

Laurens De Vocht
Ghent University | UGhent · Department of Electronics and Information Systems

MSc, PhD

About

51
Publications
5,773
Reads
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686
Citations
Additional affiliations
May 2012 - present
Ghent University
Position
  • PhD Student
May 2012 - present
iMinds
Position
  • Researcher
August 2010 - February 2011
Graz University of Technology
Position
  • Researcher

Publications

Publications (51)
Article
The transformation of society towards a digital economy and government austerity creates a new context leading to changing roles for both government and private sector. Boundaries between public and private services are blurring, enabling government and private sector to collaborate and share responsibilities. In Belgium, the regional Government of...
Chapter
Enriching scholarly data with metadata enhances the publications’ meaning. Unfortunately, different publishers of overlapping or complementary scholarly data neglect general-purpose solutions for metadata and instead use their own ad-hoc solutions. This leads to duplicate efforts and entails non-negligible implementation and maintenance costs. In t...
Article
Full-text available
When researchers formulate search queries to find relevant content on the Web, those queries typically consist of keywords that can only be matched in the content or its metadata. The Web of Data extends this functionality by bringing structure and giving well-defined meaning to the content and it enables humans and machines to work together using...
Conference Paper
Full-text available
There exists an abundance of Linked Data storage solutions, but only few meet the requirements of a production environment with interlinked life sciences data. In such environments, a triple store has to support complex SPARQL queries and handle large datasets with hundreds of millions of triples. The Ontoforce platform DISQOVER offers federated se...
Conference Paper
Each government level uses its own different information system. At the same time citizens expect that these governmental levels adopt a user-centric approach and provide instant access to their data or to open government data. Therefore the applications at various government levels need to be interoperable in support of the 'once only-principle':...
Conference Paper
Path-based storytelling with Linked Data on the Web provides users the ability to discover concepts in an entertaining and educational way. Given a query context, many state-of-the-art pathfinding approaches aim at telling a story that coincides with the user’s expectations by investigating paths over Linked Data on the Web. By taking into account...
Conference Paper
Full-text available
Linked Data storage solutions often optimize for low latency querying and quick responsiveness. Meanwhile, in the back-end, offline ETL processes take care of integrating and preparing the data. In this paper we explain a workflow and the results of a benchmark that examines which Linked Data storage solution and setup should be chosen for differen...
Conference Paper
Searching for relationships between Linked Data resources is typically interpreted as a pathfinding problem: looking for chains of intermediary nodes (hops) forming the connection or bridge between these resources in a single dataset or across multiple datasets. In many cases centralizing all needed linked data in a certain (specialized) repository...
Conference Paper
In this paper, we investigate the Normalized Semantic Web Distance (NSWD), a semantics-aware distance measure between two concepts in a knowledge graph. Our measure advances the Normalized Web Distance, a recently established distance between two textual terms, to be more semantically aware. In addition to the theoretic fundamentals of the NSWD, we...
Conference Paper
Full-text available
Travelers expect access to tourism information at anytime, anywhere, with any media. Mobile tourism guides, accessible via the Web, provide an omnipresent approach to this. Thereby it is expensive and not trivial to (re)model, translate and transform data over and over. This inhibits many players, including governments, in developing such applicati...
Conference Paper
Public administrations are often still organised in vertical, closed silos. The lack of common data standards (common data models and reference data) for exchanging information between administrations in a cross-domain and/or cross-border setting stands in the way of digital public services and automated flow of information between public administr...
Article
Billions of Linked Data triples exist in thousands of RDF knowledge graphs on the Web, but few of those graphs can be queried live from Web applications. Only a limited number of knowledge graphs are available in a queryable interface, and existing interfaces can be expensive to host at high availability. To mitigate this shortage of live queryable...
Conference Paper
Travelers expect access to tourism information at anytime, anywhere, with any media. Mobile tourist guides, accessible via the Web, provide an omnipresent approach to this. Thereby it is expensive and not trivial to (re)model, translate and transform data over and over. This inhibits many players, including governments, in developing such applicati...
Conference Paper
In this paper, we propose and investigate a novel distance-based approach for measuring the semantic dissimilarity between two concepts in a knowledge graph. The proposed Normalized Semantic Web Distance (NSWD) extends the idea of the Normalized Web Distance, which is utilized to determine the dissimilarity between two textural terms, and utilizes...
Article
Full-text available
Recent developments on sharing research results and ideas on the Web, such as research collaboration platforms like Mendeley or ResearchGate, enable novel ways to explore research information. Current search interfaces in this field focus mostly on narrowing down the search scope through faceted search, keyword matching, or filtering. The interacti...
Article
Full-text available
Billions of Linked Data triples exist in thousands of RDF knowledge graphs on the Web, but few of those graphs can be queried live from Web applications. Only a limited number of knowledge graphs are available in a queryable interface, and existing interfaces can be expensive to host at high availability. To mitigate this shortage of live queryable...
Conference Paper
Full-text available
Linked Data offers an entity-based infrastructure to resolve indirect relations between resources, expressed as chains of links. If we could benchmark how effective retrieving chains of links from these sources is, we can motivate why they are a reliable addition for exploratory search interfaces. A vast number of applications could reap the benefi...
Conference Paper
Recently, Triple Pattern Fragments (TPFs) were introduced as an alternative to reduce server load when high numbers of clients need to evaluate SPARQL queries. This is achieved by moving part of the query execution to the client, at the cost of elevated query times. Since the TPF interface purposely does not support complex constructs such as SPARQ...
Conference Paper
Digital publications host a large amount of data that currently is not harvested, due to its unstructured nature. However, manually annotating these publications is tedious. Current tools that automatically analyze unstructured text are too fine-grained for larger amounts of text such as books. A workable machine-interpretable version of larger bod...
Conference Paper
Finding relevant content automatically is still not straightforward due to the unstructured nature of large text corpora. Moreover, traditional techniques to extract structured information out of these corpora are mostly very fine-grained, which deteriorates the needed high-level overview to be able to compare publications. Also, publishing this in...
Conference Paper
Making Linked Data queryable on the Web is not an easy task for publishers, for technical and logistical reasons. Can they afford to offer a SPARQL endpoint, or should they offer an api or data dump instead? And what technical knowledge is needed for that? This demo presents a user-friendly pipeline to compose APIs for Linked Datasets, consisting o...
Conference Paper
Full-text available
Algorithmic storytelling over Linked Data on the Web is a challenging task in which many graph-based pathfinding approaches experience issues with consistency regarding the resulting path that leads to a story. In order to mitigate arbitrariness and increase consistency, we propose to improve the semantic relatedness of concepts mentioned in a stor...
Conference Paper
Full-text available
The various ways of interacting with social media, web collaboration tools, co-authorship and citation networks for scientific and research purposes remain distinct. In this paper, we propose a solution to align such information. We particularly developed an exploratory visualization of research networks. The result is a scholar centered, multi-per...
Conference Paper
Full-text available
Conference Linked Data (COLINDA)3, a recent addition to the LOD (Linked Open Data) Cloud4, exposes information about scientific events (confer- ences and workshops) for the period from 2002 up to 2015. Beside title, descrip- tion and time COLINDA includes venue information of scientific events which is interlinked with Linked Data sets of GeoNames5...
Article
Full-text available
We report on the reflection of learning activities and revealing hidden information based on tracking user behaviors with Linked Data. With in this work we introduce a case study on usage of semantic context modelling and creation of Linked Data from logs in educational systems like a Personal Learning Environment (PLE) with focus on reflection and...
Article
Full-text available
The Open Access movement and the research management can take a new turn if the research information is published as Linked Open Data. With Linked Open Data, the management of the research information within institutions and across institutions can be facilitated, the quality of the available data can be improved and their availability to the publi...
Conference Paper
For publishers of Linked Open Data, providing queryable access to their dataset is costly. Those that offer a public sparql endpoint often have to sacrifice high availability; others merely provide non-queryable means of access such as data dumps. We have developed a client-side query execution approach for which servers only need to provide a ligh...
Article
A proposed technique quantifies the semantic interoperability of open government datasets with three metrics calculated using a set of statements that indicate for each pair of identifiers in the system whether or not they represent the same concept.
Conference Paper
As the Web of Data is growing at an ever increasing speed, the lack of reliable query solutions for live public data becomes apparent. SPARQL implementations have matured and deliver impressive performance for public SPARQL endpoints, but poor availability—especially under high loads—prevents their use in real-world applications. We propose to tack...
Conference Paper
Semantically annotating and interlinking Open Data results in Linked Open Data which concisely and unambiguously describes a knowledge domain. However, the uptake of the Linked Data depends on its usefulness to non-Semantic Web experts. Failing to support data consumers understanding the added-value of Linked Data and possible exploitation opportun...
Conference Paper
Full-text available
Researcher community produces a vast of content on the Web. We assume that every researcher interest oneself in events, persons and findings of other related community members who share the same interest. Although research related archives give access to their content most of them lack on analytic services and adequate visualizations for this data....
Conference Paper
Web resources can be linked directly to their provenance, as specified in W3C PROV-AQ. On its own, this solution places all responsibility to the resource's publisher, who hopefully maintains and publishes provenance information. In reality, however, most publishers lack of incentives to publish the resources' provenance, even if the authors would...
Conference Paper
Full-text available
To inform citizens when they can use government services, governments publish the services' opening hours on their website. When opening hours would be published in a machine interpretable manner, software agents would be able to answer queries about when it is possible to contact a certain service. We introduce an ontology for describing opening h...
Conference Paper
Full-text available
In this paper, we propose the Normalized Freebase Distance (NFD), a new measure for determing semantic concept relatedness that is based on similar principles as the Normalized Web Distance (NWD). We illustrate that the NFD is more effective when comparing ambiguous concepts.
Conference Paper
Despite the significant number of existing tools, incorporating data into the Linked Open Data cloud remains complicated; hence discouraging data owners to publish their data as Linked Data. Unlocking the semantics of published data, even if they are not provided by the data owners, can contribute to surpass the barriers posed by the low availabili...
Conference Paper
Full-text available
Resources for research are not always easy to explore, and rarely come with strong support for identifying, linking and selecting those that can be of interest to scholars. In this work we introduce a model that uses state-of-the-art semantic technologies to interlink structured research data and data from Web collaboration tools, social media and...
Conference Paper
Describing multimedia content in general and TV programs in particular is a hard problem. Relying on subtitles to extract named entities that can be used to index fragments of a program is a common method. However, this approach is limited to what is being said in a program and written in a subtitle, therefore lacking a broader context. Furthermore...
Conference Paper
As the Web evolves in an integrated and interlinked knowledge space thanks to the growing amount of published Linked Open Data, the need to find solutions that enable the scholars to discover, explore and analyse the underlying research data emerges. Scholars, typically non-expert technology users, lack of in-depth understanding of the underlying s...
Article
When building reliable data-driven applications for local governments to interact with public servants or citizens, data publishers and consumers have to be sure that the applied data structure and schema definition are accurate and lead to reusable data. To understand the characteristics of reusable local government data, we motivate how the proce...
Conference Paper
Full-text available
Research information is widely available on the Web. Both as peer-reviewed research publications or as resources shared via (mi- cro)blogging platforms or other Social Media. Usually the platforms sup- porting this information exchange have an API that allows access to the structured content. This opens a new way to search and explore research info...
Conference Paper
Full-text available
We report about work in progress on tracking the activities and trends of users from logs in a widget based Personal Learning Environment (PLE) using semantic technologies and standards for retrieval. As input for the observations, we are using the data from our self developed PLE with around 4000 active users. Last two years we logged their activi...
Chapter
Full-text available
We report on the reflection of learning activities and revealing hidden information based on tracked user behaviour in our widget based PLE (Personal Learning Environment) at Graz University of Technology. Our reference data set includes information of more then 4000 active learners for a period of around two years. We have modelled activity and us...
Article
Full-text available
Based upon findings and results from our recent research (De Vocht et al., 2011) we propose a generic framework concept for researcher profiling with appliance to the areas of "Science 2.0" and "Research 2.0". Intensive growth of users in social networks, such as Twitter generated a vast amount of information. It has been shown in many previous wor...
Article
We will show that semantically annotated paths lead to discovering meaningful, non-trivial relations and connections between multiple resources in large online datasets such as the Web of Data. Graph algorithms have always been key in path finding applications (e.g., navigation systems). They make optimal use of available computation resources to f...
Conference Paper
Along with the latest developments in ICT, more specifically Social Media and Web 2.0 tools, there is a tendency towards the use of online services in research and education. This is often referred to as Research 2.0 and Technology Enhanced Learning. Web 2.0 tools are especially useful in cases where experts from different disciplines want to colla...
Conference Paper
This paper introduces a Linked Data application for automatically generating a story between two concepts in the Web of Data, based on formally described links. A path between two concepts is obtained by querying multiple linked open datasets; the path is then enriched with multimedia presentation material for each node in order to obtain a full mu...
Conference Paper
Full-text available
We propose a framework to address an important issue in the context of the ongoing adoption of the "Web 2.0" in science and research, often referred to as "Science 2.0" or "Research 2.0". A growing number of people are linked via acquaintances and online social networks such as Twitter1allows indirect access to a huge amount of ideas. These ideas a...

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Projects (6)
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