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See detailTowards Optimized Deployment of Electric Bus Systems Using Cooperative ITS
Laskaris, Georgios UL; Seredynski, Marcin; Viti, Francesco UL

Poster (2019, January)

In this paper we analyze the impact of using cooperative intelligent transportation systems (C-ITS) to manage electrical bus systems. A simulation-based study is presented where three control strategies ... [more ▼]

In this paper we analyze the impact of using cooperative intelligent transportation systems (C-ITS) to manage electrical bus systems. A simulation-based study is presented where three control strategies are used to regulate the operations of a line, namely bus holding, Green Light Optimal Dwell Time Adaptation (GLODTA) and Transit Signal Priority (TSP). The results show, using a realistic scenario of a major line in Luxembourg City, that buses are efficiently operated without necessarily providing additional priority to public transport, hence without negatively affecting the capacity of the private vehicles system. Benefits in terms of headway regulations, energy consumption and travel time variance reductions are quantified. [less ▲]

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See detailTowards place-based exploration of Instagram: Using co-design to develop an interdisciplinary geovisualization prototype
Jones, Catherine UL; Guido, Daniele UL; Severo, Marta

in Journal of Spatial Information Science (2018), 17(Winter),

An abundance of geographic information is hidden within texts and multimedia objects that has the potential to enrich our knowledge about the relationship between people and places. One such example is ... [more ▼]

An abundance of geographic information is hidden within texts and multimedia objects that has the potential to enrich our knowledge about the relationship between people and places. One such example is the geographic information embedded within user-generated content collected and curated by the social media giants. Such geographic data can be encoded either explicitly as geotags or implicitly as geographical references expressed as texts that comprise part of a title or image caption. To use such data for knowledge building there is a need for new mapping interfaces. These interfaces should support both data integration and visualization, and geographical exploration with openended discovery. Based on a user scenario on the Via Francigena (a significant European cultural route), we set out to adapt an existing humanities interface to support social and spatial exploration of how the route is perceived. Our dataset was derived from Instagram. We adopted a thinking by doing approach to co-design an interdisciplinary prototype and discuss the six stages of activity, beginning with the definition of the use case and ending in experimentation with a working technology prototype. Through reflection on the process of tool modification and an in-depth exploration of the data encoding, we were better able to understand the strengths and limitations of the data, the tool, and the underlying workflows. This in-depth knowledge helped us to define a set of requirements for tools and data that will serve as a valuable contribution for those engaged in the design of deep mapping interfaces for place-based research [less ▲]

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See detailTowards PPP-RTK: Ambiguity Resolution in Real-Time Precise Point Positioning
Geng, J.; Teferle, Felix Norman UL; Meng, X. et al

in Advances in Space Research (2010)

Integer ambiguity resolution at a single station can be achieved by introducing predetermined uncalibrated phase delays (UPDs) into the float ambiguity estimates of precise point positioning (PPP). This ... [more ▼]

Integer ambiguity resolution at a single station can be achieved by introducing predetermined uncalibrated phase delays (UPDs) into the float ambiguity estimates of precise point positioning (PPP). This integer resolution technique has the potential of leading to a PPP-RTK (Real-Time Kinematic) model where PPP provides rapid convergence to a reliable centimeter-level positioning accuracy based on an RTK reference network. Nonetheless, implementing this model is technically subject to how rapidly we can fix wide-lane ambiguities, stabilize narrow-lane UPD estimates, and achieve the first ambiguity-fixed solution. To investigate these issues, we used seven days of 1-Hz sampling GPS data at 91 stations across Europe. We find that at least 10 minutes of observations are required for most receiver types to reliably fix about 90% of wide-lane ambiguities corresponding to high elevations, and over 20 minutes to fix about 90% of those corresponding to low elevations. Moreover, several tens of minutes are usually required for a regional network before a narrow-lane UPD estimate stabilizes to an accuracy of far better than 0.1 cycles. Finally, for hourly data, ambiguity resolution can significantly improve the accuracy of epoch-wise position estimates from 13.7, 7.1 and 11.4 cm to 0.8, 0.9 and 2.5 cm for the East, North and Up components, respectively, but a few tens of minutes is required to achieve the first ambiguity-fixed solution. Therefore, from the timeliness aspect, our PPP-RTK model currently cannot satisfy the critical requirement of instantaneous precise positioning where ambiguity-fixed solutions have to be achieved within at most a few seconds. However, this model can still be potentially applied to some near-real-time remote sensing applications, such as the GPS meteorology. [less ▲]

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See detailTowards Privacy-Neutral Travel Time Estimation from Mobile Phone Signalling Data
Derrmann, Thierry UL; Frank, Raphaël UL; Faye, Sébastien UL et al

in Proceedings of the 2016 IEEE International Smart Cities Conference (ISC2) (2016, September)

Today’s mobile penetration rates enable cellular signaling data to be useful in diverse fields such as transportation planning, the social sciences and epidemiology. Of particular interest for these ... [more ▼]

Today’s mobile penetration rates enable cellular signaling data to be useful in diverse fields such as transportation planning, the social sciences and epidemiology. Of particular interest for these applications are mobile subscriber dwell times. They express how long users stay in the service range of a base station. In this paper, we want to evaluate whether dwell time distributions can serve as predictors for road travel times. To this end, we transform floating car data into synthetic dwell times that we use as weights in a graph-based model. The model predictions are evaluated using the floating car ground truth data. Additionally, we show a potential link between handover density and travel times. We conclude that dwell times are a promising predictor for travel times, and can serve as a valuable input for intelligent transportation systems. [less ▲]

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See detailTowards Purposeful Enterprise Modeling for Enterprise Analysis
de Kinderen, Sybren; Ma, Qin UL

in 2018 International Conference on Information Management & Management Science (2018)

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See detailTowards Reinventing Online Privacy
Gheorghe, Gabriela UL; Engel, Thomas UL

in Berendt, Bettina; Engel, Thomas; Ikonomou, Demosthenes (Eds.) et al LNCS - Annual Privacy Forum 2015 - Bridging the gap between research and policy (2015)

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See detailTowards Safe and Secure Autonomous and Cooperative Vehicle Ecosystems
Caldeira Lima, Antonio UL; Rocha, Francisco UL; Volp, Marcus UL et al

in Proceedings of the Second ACM Workshop on Cyber-Physical Systems Security and PrivaCy (2016, October)

Semi-autonomous driver assists are already widely deployed and fully autonomous cars are progressively leaving the realm of laboratories. This evolution coexists with a progressive connectivity and ... [more ▼]

Semi-autonomous driver assists are already widely deployed and fully autonomous cars are progressively leaving the realm of laboratories. This evolution coexists with a progressive connectivity and cooperation, creating important safety and security challenges, the latter ranging from casual hackers to highly-skilled attackers, requiring a holistic analysis, under the perspective of fully-fledged ecosystems of autonomous and cooperative vehicles. This position paper attempts at contributing to a better understanding of the global threat plane and the specific threat vectors designers should be at- tentive to. We survey paradigms and mechanisms that may be used to overcome or at least mitigate the potential risks that may arise through the several threat vectors analyzed. [less ▲]

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See detailTowards safer foods and more democratic decisions: Is this a contradictory goal?
König, Ariane UL

in Oléagineux, Corps Gras, Lipides (2007), 14(2), 92-99

Since the mid-1990s and the BSE crisis food safety policy is a priority of the EU. In practise there are however many hurdles towards implementing principles of improved governance, such as transparency ... [more ▼]

Since the mid-1990s and the BSE crisis food safety policy is a priority of the EU. In practise there are however many hurdles towards implementing principles of improved governance, such as transparency and greater participation, especially at EU-level. This paper presents the work of the SAFE FOODS prospect towards the development an improved framework for risk analysis. The final aim is to develop concrete recommendations on how to facilitate coordination between risk assessors, risk managers and stakeholders across the EU, and to keep methods for risk assessment apace with developments in the life sciences. [less ▲]

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See detailTowards Seamless Integration of N-Version Programming in Model-Based Design
Hu, Tingting UL; Cibrario Bertolotti, Ivan; Navet, Nicolas UL

in 22nd IEEE International Conference on Emerging Technologies And Factory Automation (ETFA’2017), Limassol, Cyprus, September 12-15 2017 (2017)

The ever-growing complexity of present-day software systems raises new and more stringent requirements on their availability, pushing designers to make use of sophisticated fault tolerance techniques far ... [more ▼]

The ever-growing complexity of present-day software systems raises new and more stringent requirements on their availability, pushing designers to make use of sophisticated fault tolerance techniques far beyond the areas they were traditionally conceived for, and bringing new challenges to both the modelling and implementation phases. In this paper, we propose a design pattern to model in a domain-specific language one of the prominent fault-tolerant techniques, namely the N-version programming. It can be integrated seamlessly into existing applications to enhance their functional correctness, while still preserving the timing characteristics, in particular the sampling times. Besides, it is also designed in a way to ease the automatic code generation. A counterpart of the same framework is also implemented in a lower-level programming language, for use when direct model execution is impractical, like in severely resource-limited embedded targets. [less ▲]

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See detailTowards Securing Communications in Infrastructure-poor Areas
Ahmat, Daouda; Bissyande, Tegawendé François D Assise UL; Magoni, Damien

in Proceedings of the 5th EAI International Conference on e-Infrastructure and e-Services for Developing Countries (2013)

Structured P2P networks have proven to be effective in the exchange of data between nodes whose identity and content are generally indexed in a DHT. For years, such DHT networks have allowed, among other ... [more ▼]

Structured P2P networks have proven to be effective in the exchange of data between nodes whose identity and content are generally indexed in a DHT. For years, such DHT networks have allowed, among other users, third world inhabitants, such as African people, to exchange information among them and with the rest of the world without relying on a centralized infrastructure. Unfortunately, more than ever, reliability of communication across the Internet is threatened by various attacks, including usurpation of identity, eavesdropping or traffic modification. Thus, in order to overcome these security issues and allow peers to securely exchange data, we propose a new key management scheme that enables to handle public keys in the absence of a central coordination which would be required in a traditional PKI. [less ▲]

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See detailTowards Security-aware Mutation Testing
Loise, Thomas; Devroey, Xavier; Perrouin, Gilles et al

in The 12th International Workshop on Mutation Analysis (Mutation 2017) (2017)

Detailed reference viewed: 91 (2 UL)
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See detailTowards Semantic Interoperability in an Open IoT Ecosystem for Connected Vehicle Services
Kolbe, Niklas UL; Kubler, Sylvain UL; Robert, Jérémy UL et al

in 2017 IEEE Global Internet of Things Summit (GIoTS) Proceedings (2017, July)

A present challenge in today’s Internet of Things (IoT) ecosystem is to enable interoperability across hetero- geneous systems and service providers. Restricted access to data sources and services limits ... [more ▼]

A present challenge in today’s Internet of Things (IoT) ecosystem is to enable interoperability across hetero- geneous systems and service providers. Restricted access to data sources and services limits the capabilities of a smart city to improve social, environmental and economic aspects. Interoperability in the IoT is concerned with both, messaging interfaces and semantic understanding of heterogeneous data. In this paper, the first building blocks of an emerging open IoT ecosystem developed at the EU level are presented. Se- mantic web technologies are applied to the existing messaging components to support and improve semantic interoperability. The approach is demonstrated with a proof-of-concept for connected vehicle services in a smart city setting. [less ▲]

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See detailTowards sustainable materials for solar energy conversion: Preparation and photoelectrochemical characterization of Cu2ZnSnS4
Scragg, Jonathan J.; Dale, Phillip UL; Peter, Laurence

in Electrochemistry Communications (2008), 10(4), 639-642

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See detailTowards Systematic Specification of Non-Functional Requirements for Sharing Economy Services
Symeonidis, Iraklis UL; Schroers, Jessica; Mustafa A. Mustafa, Mustafa A. et al

in Abstract book of International Workshop on Smart Circular Economy, IEEE (2019)

Sharing Economy (SE) systems use technologies to enable sharing of physical assets and services among individuals. This allows optimisation of resources, thus contributing to the re-use principle of ... [more ▼]

Sharing Economy (SE) systems use technologies to enable sharing of physical assets and services among individuals. This allows optimisation of resources, thus contributing to the re-use principle of Circular Economy. In this paper, we assess existing SE services and identify their challenges in areas that are not technically connected to their core functionality but are essential in creating trust: information security and privacy, personal data protection and fair economic incentives. Existing frameworks for elicitation of non-functional requirements are heterogeneous in their focus and domain specific. Hence, we propose to develop a holistic methodology for non-functional requirements specification for SE systems following a top-down-top approach. A holistic methodology considering non-functional requirements is essential and can assist in the analysis and design of SE systems in a systematic and unified way applied from the early stages of the system development. [less ▲]

Detailed reference viewed: 66 (3 UL)
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See detailTowards systemic change: On the co-creation and evaluation of a study programme in transformative sustainability science with stakeholders in Luxembourg
König, Ariane UL

in Current Opinion in Environmental Sustainability (2015), 16

This paper examines a study programme in ‘Sustainability and social innovation’ at the University of Luxembourg that was co-created with key external stakeholders in local sustainability transitions.The ... [more ▼]

This paper examines a study programme in ‘Sustainability and social innovation’ at the University of Luxembourg that was co-created with key external stakeholders in local sustainability transitions.The programme’s aim is to equip scientists and citizens for the practice of transformative sustainability science to change human environment interactions. Addressing socially salient, complex problems invites a re-conception of what role universities can play in knowledge production processes in more applied and local contexts. We critically discuss the programme’s ambition to provide a platform for transformative social learning for sustainability and to contribute to fostering systemic change in Luxembourg. We deduce design requisites to achieve these ambitions. The paper also discusses the role of different forms of evaluation in effecting individual programme and systemic change. Research insights were drawn from documentary and literature research, concept-building, programme implementation, observation, analysis, and evaluation by students and contributors. [less ▲]

Detailed reference viewed: 172 (13 UL)
See detailTowards systems ecology of the human gut microbiome
Wilmes, Paul UL

Presentation (2017, March)

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See detailTowards Temporal Conviviality Measures
Caire, Patrice UL; Alcalde, Baptiste UL; van der Torre, Leon UL et al

in Benelux Conference on Artificial Intelligence (2011)

Detailed reference viewed: 44 (1 UL)
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See detailTowards Test-Driven and Architecture Model-Based Security and Resilience Engineering
Saidane, Ayda; Guelfi, Nicolas UL

in Singh, Hardeep; Kaur, Kulwant (Eds.) Designing, Engineering, and Analyzing Reliable and Efficient Software (2013)

Detailed reference viewed: 70 (0 UL)
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See detailTowards the Arms Trade Treaty
Mochtak, Michal UL

in Majer, Marián; Ondrejcsál, Róbert; Tarasovič, Vladimír (Eds.) et al Panorama of global security environment 2014 (2015)

Detailed reference viewed: 11 (0 UL)