Browsing Institutt for datateknologi og informatikk by Author "Ahlers, Dirk"
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Investigating contextual ontologies and document corpus characteristics for information access in engineering settings
Mehrpoor, Mahsa; Ahlers, Dirk; Gulla, Jon Atle; Kristensen, Kjetil; Sivertsen, Ole Ivar (Journal article; Peer reviewed, 2017)Knowledge and information are valuable resources in enterprises for solution reuse. However, identifying relevant information from a rapidly growing number of unstructured resources is challenging for users. We discuss a ... -
Linkage Quality Analysis of GeoNames in the Semantic Web
Ahlers, Dirk (Chapter, 2017)We examine the GeoNames gazetteer as a hub of Linked Geospatial Data. We survey quality and linkage characteristics to understand how well it supports the traversal of the Semantic Web and which limitations exist. We examine ... -
Mining Twitter Features for Event Summarization and Rating
Mallela, Deepa; Ahlers, Dirk; Pera, Maria Soledad (Chapter, 2017)We present CEST, a generic method for detection and rich summarization of events occurring in a city. CEST exploits Twitter metadata, does not need prior information on events, and is event category and structure agnostic. ... -
Modelling pervasive platforms and digital services for smart urban transformation using an enterprise architecture framework
Bokolo, Anthony Junior; Petersen, Sobah Abbas; Helfert, Markus; Ahlers, Dirk; Krogstie, John (Peer reviewed; Journal article, 2021)Purpose In smart cities pervasive systems are deployed by enterprises and stakeholders in municipalities to provide digital services to citizens. But cities are faced with the challenge of achieving system pluggability, ... -
Multi-source entity-based conflation for local search
Ahlers, Dirk (Peer reviewed; Journal article, 2012)Local search is a well-established mode of Web search engines today. For most developed countries, a huge amount of data is directly available on the Web and can be extracted and processed by search engines. In many ... -
Poisson Factorization Models for Spatiotemporal Retrieval
de Souza da Silva, Eliezer; Ahlers, Dirk (Chapter, 2017)New retrieval models promise deeper integration of multiple features and sources of information. The inclusion of thematic and location features in a joint factorization model allows location to be modeled as a first-class ... -
Spatio-Temporal Quality Issues for Local Search
Ahlers, Dirk (Chapter, 2014)Geographic search is routinely used in many services and applications that exploit the availability of Web content which is related to a real world place, region or object. However, do you trust the location information? ... -
Supporting Municipal Greenhouse Gas (GHG) Emission Inventories Using Business Process Modeling: A Case Study of Trondheim Municipality
Ahlers, Dirk; Krogstie, John; Driscoll, Patrick Arthur; Lundli, Hans Einar; Loveland, Simon-James; Rothballer, Carsten; Wyckmans, Annemie (Journal article, 2017)Business process modeling and business process management has been used to capture, support and improve a large variety of processes and practices in the private and public sector. Traditionally what is regarded as a good ... -
Surveying GeoNames Gazetteer Data for the Nordic Countries
Ahlers, Dirk (Peer reviewed; Journal article, 2015)Gazetteers are the basis of many geospatial applications and serve an important role to collect and make available knowledge about the physical world such as place names and their coordinates. GeoNames is one of the largest ... -
Towards a Development Process for Geospatial Information Retrieval and Search
Ahlers, Dirk (Chapter, 2013)Geospatial search as a special type of vertical search has specific requirements and challenges. While the general principle of resource discovery, extraction, indexing, and search holds, geospatial search systems are ... -
Towards understanding digital support contributing to climate neutral, inclusive, and beautiful cities: A systematic literature review
Takaoka, Alicia Julia Wilson; Ahlers, Dirk; Ådlandsvik, Ferdinand Ward; Dovland, Eivind Syrdalen; Jaccheri, Maria Letizia (Chapter, 2023)Climate change is an existential threat to Europe and the world, and is impacting and influencing people. At the same time, the urbanization of the world is increasing, meaning that these challenges need to be solved mainly ... -
Towards understanding digital support contributing to climate neutral, inclusive, and beautiful cities: A systematic literature review
Takaoka, Alicia Julia Wilson; Ahlers, Dirk; Jaccheri, Maria Letizia; Dovland, Eivind Syrdalen; Ådlandsvik, Ferdinand Ward (Journal article, 2023)Climate change is an existential threat to Europe and the world, and is impacting and influencing people. At the same time, the urbanization of the world is increasing, meaning that these challenges need to be solved mainly ... -
Understanding challenges in municipal greenhouse gas emission inventories
Ahlers, Dirk; Driscoll, Patrick (Chapter, 2016)A necessary prerequisite for impactful climate mitigation action is the availability of suitable and reliable baselines of emissions. This is especially true for urban and citylevel actions and strategies that need reliable ... -
Understanding Smart Cities as Social Machines
Ahlers, Dirk; Driscoll, Patrick; Löfström, Erica; Krogstie, John; Wyckmans, Annemie (Chapter, 2016)Smart Cities denote a stronger integration of information technology into the organisation of a city and the interaction and participation of its citizens. In developing the concept further, we propose to understand Smart ... -
Value-Added Services, Virtual Enterprises and Data Spaces Inspired Enterprise Architecture for Smart Cities
Petersen, Sobah Abbas; Pourzolfaghar, Zohreh; Alloush, Iyas; Ahlers, Dirk; Krogstie, John; Helfert, Markus (Chapter, 2019)As a part of their digital transformation, municipalities across Europe have taken initiatives to support Open Data platforms and provide services leveraging on data. This challenges the traditional business driven IT ... -
Visualizing a city within a city – Mapping mobility within a university campus
Ahlers, Dirk; Aulie, Kristoffer; Eriksen, Jeppe; Krogstie, John (Peer reviewed; Journal article, 2016)Urban mobility analysis usually examines large cities or even regions. We take another angle and examine a university campus as a city within a city to focus on small-scale and hyperlocal characteristics. The campus mobility ... -
Where the streets have no name - Experiences in GIR for a developing country
Ahlers, Dirk (Chapter, 2013)This paper gives a short overview of a project on Geographic Information Retrieval in developing countries in the form of an experience report based in Honduras. It provides some insights into encountered challenges of ... -
Zero Emission Neighbourhoods in Smart Cities. Definition, Key Performance Indicators and Assessment Criteria: Version 2.0
Wiik, Marianne Rose Kjendseth; Fufa, Selamawit Mamo; Fjellheim, Kristin; Lien, Synne Krekling; Krogstie, John; Ahlers, Dirk; Wyckmans, Annemie; Driscoll, Patrick Arthur; Brattebø, Helge; Gustavsen, Arild (ZEN Report;, Research report, 2021)This document outlines the definition, key performance indicators (KPI) and assessment criteria for the Research Centre on Zero Emission Neighbourhoods in Smart Cities (ZEN research centre). This second version of the ZEN ... -
Zero Emission Neighbourhoods in Smart Cities: Definition, Key Performance Indicators and Assessment Criteria: Version 1.0
Wiik, Marianne Rose Kjendseth; Fufa, Selamawit Mamo; Krogstie, John; Ahlers, Dirk; Wyckmans, Annemie; Driscoll, Patrick Arthur; Brattebø, Helge; Gustavsen, Arild (ZEN Report;, Research report, 2018)This document outlines the definition, key performance indicators (KPI) and assessment criteria for the Research Centre on Zero Emission Neighbourhoods in Smart Cities (ZEN research centre). This first version of the ZEN ...