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See detailHow ill is your IT Portfolio? : Measuring Criticality in IT Portfolios Using Epidemiology
Guggenmos, Florian; Hofmann, Peter; Fridgen, Gilbert UL

in 40th International Conference on Information Systems, Munich, Germany, 2019 (2019)

IT project portfolios, consisting of IT projects, also interact with the entire IT landscape. In case of a failure of only one element, existing dependencies can lead to a cascade failure, which can cause ... [more ▼]

IT project portfolios, consisting of IT projects, also interact with the entire IT landscape. In case of a failure of only one element, existing dependencies can lead to a cascade failure, which can cause high losses. Despite the present effects of systemic risk, research into IT portfolio management lacks suitable methods to quantitatively assess systemic risk. We follow the design science research paradigm to develop and evaluate our ‘on track’ or ‘in difficulty’ (TD) method by applying the SI model, representing a recognized network diffusion model in epidemiology, in an IT portfolio context. We evaluate our method using a real-world dataset. We introduce a criticality measure for diffusion models in IT portfolios and compare the TD method’s results and the alpha centrality to human judgment as a benchmark. From our evaluation, we conclude that the TD method outperforms alpha centrality and is a suitable risk measure in IT portfolio management. [less ▲]

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See detailÜberprüfung der Machbarkeit eines offenen und dezentralen Mobilitätssystems (OMOS)
Fridgen, Gilbert UL; Röhlen, Jörg; Guggenberger, Tobias et al

Report (2019)

The customer requirements for mobility systems are changing. Travelers increasingly expect a carefree travel experience with any starting or destination point ("Seamless Mobility as a Service") - and that ... [more ▼]

The customer requirements for mobility systems are changing. Travelers increasingly expect a carefree travel experience with any starting or destination point ("Seamless Mobility as a Service") - and that with a single booking and billing for all means of transport used. In order to meet this need, the idea of ​​an open and decentralized mobility system is increasingly being discussed, which can integrate the offers of various mobility providers through a common, neutral system. Before such a system can take a concrete form, however, a clear understanding of the opportunities and risks as well as the specific requirements of end customers and mobility providers on such a system is required. The aim of this study is to identify and evaluate the general opportunities and risks of a corresponding system, as well as the general feasibility of the requirements placed on such a system. A multi-method approach was chosen for this purpose. This makes it possible to examine a holistic picture of the requirements of end customers as well as mobility providers and other stakeholders (e.g. technology providers). Records from a workshop with the (associated) partners in the OMOS project and the results of a literature analysis were used as the basis for data collection. To examine the end customer needs, two surveys were carried out with a total of 352 participants, whose questions were derived from practical workshops (survey I) and theoretical models (survey II). In addition, an interview study was carried out with 15 experts to discuss the requirements of various stakeholders, on the basis of which general topics in the field of seamless mobility were also asked. [less ▲]

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See detailAkkulturation als Integrationsressource
Maehler, Débora; Murdock, Elke UL; Albert, Isabelle UL

in Pickel, Gert; Decker, Oliver; Kailitz, Steffen (Eds.) et al Handbuch Integration (2019)

Akkulturation ist ein breit gefasstes Konzept, das Veränderungen in Folge eines interkulturellen Kontaktes beschreibt. Im Beitrag werden Modelle sowie der Bezugsahmen der Akkulturation dargestellt. Dabei ... [more ▼]

Akkulturation ist ein breit gefasstes Konzept, das Veränderungen in Folge eines interkulturellen Kontaktes beschreibt. Im Beitrag werden Modelle sowie der Bezugsahmen der Akkulturation dargestellt. Dabei können verschiedene Facetten des individuellen Akkulturationsprozesses betrachtet werden. Hierzu zählen die Einstellung zur Akkulturation, kognitive Kompetenzen, die soziale Interaktion, die Identität, das Verhaltensrepertoire und die strukturelle Platzierung. Basierend auf dem bidimensionalen Modell war die Akkulturationsforschung im letzten Jahrzehnt stark auf Typologien zentriert, die die Beziehung zwischen der Herkunftskultur und der Aufnahmegeschalt auf Individualebene beschreibt. Dabei wurde vorwiegend von einer Defizitperspektive ausgegangen. In Anbetracht einer globalisierten Welt sollte Akkulturation jedoch aus einer Ressourcenperspektive verstanden werden, da das Wissen um und über verschiedene Kulturen das Verhaltensrepertoire von Individuen erweitert. [less ▲]

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See detailMobility among older adults: Deconstructing the effects of motility and movement on wellbeing
Cuignet, T.; Perchoux, C.; Caruso, Geoffrey UL et al

in Urban Studies (2019)

Daily mobility has been shown to contribute to the wellbeing of older adults, as it promotes healthy and independent living. However, very little is known about how the complex relationships between ... [more ▼]

Daily mobility has been shown to contribute to the wellbeing of older adults, as it promotes healthy and independent living. However, very little is known about how the complex relationships between locations, geographic environments and daily mobility relate to wellbeing. In the current paper, we rely on the concept of ‘motility’– defined as potential mobility– and the concept of ‘movement’– defined as actual mobility– to take a step forwards in disentangling the relationship between mobility and wellbeing. We further examine how both motility and movement relate to two complementary definitions of wellbeing: hedonic wellbeing as a measurement of happiness, and eudaimonic wellbeing as the actualisation of an individual’s human potential. To investigate this relationship, we draw up a conceptual framework stressing pathways linking mobility to wellbeing, which we empirically test using structural equation modelling on a stratified sample of 470 older adults. We first quantitatively confirm that motility is defined by access, competences, appropriation and attitudes to modes of transportation. We then observe that motility has direct effects on eudaimonic wellbeing and, to a lesser extent, on hedonic wellbeing. Part of the motility effects on wellbeing are mediated by movement. Separating mobility into motility and movement stresses the independent and complementary role that potential and realised mobility play in shaping older adults’ wellbeing. © Urban Studies Journal Limited 2019. [less ▲]

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See detailWalking, trip purpose, and exposure to multiple environments: A case study of older adults in Luxembourg
Perchoux, C.; Brondeel, R.; Wasfi, R. et al

in Journal of Transport and Health (2019), 13

Purpose: Understanding the geographical and environmental triggers for active transport among older adults is crucial to promote healthy and independent lifestyles. While transportation research has long ... [more ▼]

Purpose: Understanding the geographical and environmental triggers for active transport among older adults is crucial to promote healthy and independent lifestyles. While transportation research has long considered trip purpose as a major determinant of transport mode choices, “place and health” research has paid little attention to it, and even less in connection with environmental determinants. To avoid an oversimplification of how neighborhood built environments influence utilitarian walking, it is critical to account simultaneously for trip purposes, the locations of visited places, and the related exposure to surrounding environments. Methods: Based on a cohort of 471 older adults in Luxembourg, this study examines the influence of trip purposes on utilitarian walking, and the potential interaction effects with characteristics of multiple geographic environments and distance to the place of residence. Information related to demographics, health status, and regularly visited destinations was collected in 2015 and 2016. Associations between trip purpose, environment, distance, and walking were analyzed using multilevel logistic regressions, accounting for demographics, neighborhood self-selection, and health status. Results: After accounting for environmental attributes, distance, and confounding factors, trip purpose remained a strong correlate of walking among older adults. Associations between distance and walking strongly differed by trip purpose (Wald Chi 2 test p < 0.001). Access to amenities, public transport stops, and street connectivity were associated with walking, although no interaction with trip purpose was observed. Conclusion: Trip purposes based on free-time activities–including visits to family and friends, and restaurants and cafés–seem to be less influenced by the barrier effect of distance on walking. While place and health studies increasingly address both the “where” and “when” of travel behaviors, the current study additionally stresses the importance of the trip purpose to emphasize “why” and “for what” people walk. © 2019 [less ▲]

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See detailDecoupling, Information Technology, and the Tradeoff between Organizational Reliability and Organizational Agility
Keller, Robert; Ollig, Philipp; Fridgen, Gilbert UL

in 27th European Conference on Information Systems (ECIS) (2019)

Information technology (IT) units within organizations pursue both organizational reliability and agility goals. Reliability ensures the stability and business continuity of organizations, whereas agility ... [more ▼]

Information technology (IT) units within organizations pursue both organizational reliability and agility goals. Reliability ensures the stability and business continuity of organizations, whereas agility helps to detect and exploit market opportunities. In our research, we study projects in 19 organizations and unravel the relationship between agility and reliability. We observe that in certain cases reliability can undermine agility and vice versa. Global rules, routines, and procedures can hinder organizational agility whereas responding creatively for agility can locally undermine global organizational reliability. Further, we find that organizations often use decoupling to deal with this trade-off. Although decoupling enables them to be agile and reliable at the same time, it risks undermining both capabilities in the future, by encouraging the accumulation of technical debt. We find indications of how technical debt limits opportunities to creatively respond and can increase vulnerabilities. [less ▲]

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See detailAffordance-Experimentation-Actualization Theory in Artificial Intelligence Research : a Predictive Maintenance Story
Keller, Robert; Stohr, Alexander; Fridgen, Gilbert UL et al

in 40th International Conference on Information Systems (2019)

Artificial intelligence currently counts among the most prominent digital technologies and promises to generate significant business value in the future. Despite a growing body of knowledge, research ... [more ▼]

Artificial intelligence currently counts among the most prominent digital technologies and promises to generate significant business value in the future. Despite a growing body of knowledge, research could further benefit from incorporating technological features, human actors, and organizational goals into the examination of artificial intelligence-enabled systems. This integrative perspective is crucial for effective implementation. Our study intends to fill this gap by introducing affordance-experimentation-actualization theory to artificial intelligence research. In doing so, we conduct a case study on the implementation of predictive maintenance using affordance-experimentation-actualization theory as our theoretical lens. From our study, we find further evidence for the existence of the experimentation phase during which organizations make new technologies ready for effective use. We propose extending the experimentation phase with the activity of ‘conceptual exploration’ in order to make affordance-experimentation-actualization theory applicable to a broader range of technologies and the domain of AI-enabled systems in particular. [less ▲]

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See detailDie Folgen des Wiener Kongresses für Westeuropa - eine Einleitung.
Fickers, Andreas UL; Franz, Norbert; Laux, Stephan

in Laux, Stephan; Fickers, Andreas; Franz, Norbert (Eds.) Repression, Reform und Neuordnung im Zeitalter der Revolutionen. Die Folgen des Wiener Kongresses für Westeuropa (2019)

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See detailRepression, Reform und Neuordnung im Zeitalter der Revolution. Die Folgen des Wiener Kongresses für Westeuropa.
Fickers, Andreas UL; Franz, Norbert; Laux, Stephan

Book published by Peter Lang (2019)

Dieser Band reflektiert die Folgen des Wiener Kongresses für Westeuropa, insbesondere aus der Perspektive der europäischen Großregion Saarland-Lothringen-Luxemburg-Rheinland-Pfalz-Wallonie. Die ... [more ▼]

Dieser Band reflektiert die Folgen des Wiener Kongresses für Westeuropa, insbesondere aus der Perspektive der europäischen Großregion Saarland-Lothringen-Luxemburg-Rheinland-Pfalz-Wallonie. Die territoriale und politische Neuordnung Europas wird aus regionalhistorischer Perspektive untersucht, ohne die transnationalen Dimensionen dieses komplexen Prozesses aus den Augen zu verlieren. [less ▲]

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See detailCompensating Balancing Demand by Spatial Load Migration : The Case of Geographically Distributed Data Center
Thimmel, Markus; Fridgen, Gilbert UL; Keller, Robert et al

in Energy Policy (2019), 130

The increasing share of renewables confronts existing power grids with a massive challenge, stemming from additional volatility to power grids introduced by renewable energy sources. This increases the ... [more ▼]

The increasing share of renewables confronts existing power grids with a massive challenge, stemming from additional volatility to power grids introduced by renewable energy sources. This increases the demand for balancing mechanisms, which provide balancing power to ensure that power supply always meets with demand. However, the ability to provide cost-efficient and eco-friendly balancing power can vary significantly between locations. Fridgen et al. (2017) introduce an approach based on geographically distributed data centers, aiming at the spatial migration of balancing power demand between distant locations. Although their approach enables the migration of balancing demand to cost-efficient and/or eco-friendly balancing mechanisms, it will come up against limits if deployed on a global scale. In this paper, we extend Fridgen et al. (2017)’s approach by developing a model based on geographically distributed data centers, which not only enables the migration of balancing demand but also compensates for this migration when it is contradictory between different balancing power markets without burdening conventional balancing mechanisms. Using a simulation based on real-world data, we demonstrate the possibility to exploit the potential of compensation balancing demand offered by spatial load migration resulting in economic gains that will incentivize data center operators to apply our model. [less ▲]

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See detailOn privacy notions in anonymous communication
Kuhn, Christiane; Beck, Martin; Schiffner, Stefan UL et al

in Proceedings on Privacy Enhancing Technologies (2019), 2019(2), 105--125

Many anonymous communication networks (ACNs) with different privacy goals have been devel- oped. Still, there are no accepted formal definitions of privacy goals, and ACNs often define their goals ad hoc ... [more ▼]

Many anonymous communication networks (ACNs) with different privacy goals have been devel- oped. Still, there are no accepted formal definitions of privacy goals, and ACNs often define their goals ad hoc. However, the formal definition of privacy goals benefits the understanding and comparison of different flavors of privacy and, as a result, the improvement of ACNs. In this paper, we work towards defining and comparing pri- vacy goals by formalizing them as privacy notions and identifying their building blocks. For any pair of no- tions we prove whether one is strictly stronger, and, if so, which. Hence, we are able to present a complete hier- archy. Using this rigorous comparison between notions, we revise inconsistencies between the existing works and improve the understanding of privacy goals. [less ▲]

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See detailEarly Pleistocene enamel proteome from Dmanisi resolves Stephanorhinus phylogeny.
Cappellini, Enrico; Welker, Frido; Pandolfi, Luca et al

in Nature (2019)

The sequencing of ancient DNA has enabled the reconstruction of speciation, migration and admixture events for extinct taxa(1). However, the irreversible post-mortem degradation(2) of ancient DNA has so ... [more ▼]

The sequencing of ancient DNA has enabled the reconstruction of speciation, migration and admixture events for extinct taxa(1). However, the irreversible post-mortem degradation(2) of ancient DNA has so far limited its recovery-outside permafrost areas-to specimens that are not older than approximately 0.5 million years (Myr)(3). By contrast, tandem mass spectrometry has enabled the sequencing of approximately 1.5-Myr-old collagen type I(4), and suggested the presence of protein residues in fossils of the Cretaceous period(5)-although with limited phylogenetic use(6). In the absence of molecular evidence, the speciation of several extinct species of the Early and Middle Pleistocene epoch remains contentious. Here we address the phylogenetic relationships of the Eurasian Rhinocerotidae of the Pleistocene epoch(7-9), using the proteome of dental enamel from a Stephanorhinus tooth that is approximately 1.77-Myr old, recovered from the archaeological site of Dmanisi (South Caucasus, Georgia)(10). Molecular phylogenetic analyses place this Stephanorhinus as a sister group to the clade formed by the woolly rhinoceros (Coelodonta antiquitatis) and Merck's rhinoceros (Stephanorhinus kirchbergensis). We show that Coelodonta evolved from an early Stephanorhinus lineage, and that this latter genus includes at least two distinct evolutionary lines. The genus Stephanorhinus is therefore currently paraphyletic, and its systematic revision is needed. We demonstrate that sequencing the proteome of Early Pleistocene dental enamel overcomes the limitations of phylogenetic inference based on ancient collagen or DNA. Our approach also provides additional information about the sex and taxonomic assignment of other specimens from Dmanisi. Our findings reveal that proteomic investigation of ancient dental enamel-which is the hardest tissue in vertebrates(11), and is highly abundant in the fossil record-can push the reconstruction of molecular evolution further back into the Early Pleistocene epoch, beyond the currently known limits of ancient DNA preservation. [less ▲]

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See detailCreditor Protection in Private Companies - the Luxembourg Experience
Corbisier, Isabelle UL

in Bruloot, Diederik (Ed.) Belgian and European Perspectives on Creditor Protection in Closed Companies (2019)

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See detailThe LuNa Open Toolbox for the Luxembourgish Language
Sirajzade, Joshgun UL; Schommer, Christoph UL

in Perner, Petra (Ed.) Advances in Data Mining, Applications and Theoretical Aspects, Poster Proceedings 2019 (2019)

Despite some recent work, the ongoing research for the processing of Luxembourgish is still largely in its infancy. While a rich variety of linguistic processing tools exist, especially for English, these ... [more ▼]

Despite some recent work, the ongoing research for the processing of Luxembourgish is still largely in its infancy. While a rich variety of linguistic processing tools exist, especially for English, these software tools offer little scope for the Luxembourgish language. LuNa (a Tool for Luxembourgish National Corpus) is an Open Toolbox that allows researchers to annotate a text corpus written in Luxembourgish language and to build/query an annotated corpus. The aim of the paper is to demonstrate the components of the system and its usage for Machine Learning applications like Topic Modelling and Sentiment Detection. Overall, LuNa bases on a XML-database to store the data and to define the XML scheme, it offers a Graphical User Interface (GUI) for a linguistic data preparation such as tokenization, Part-Of-Speech tagging, and morphological analysis -- just to name a few. [less ▲]

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See detailBeyond internationalisation and isomorphism – the construction of a global higher education regime
Zapp, Mike UL; Ramirez, Francisco

in Comparative Education (2019)

National higher education systems are undergoing profound changes, discussed in many but unrelated studies as outcomes of internationalisation dynamics and institutional isomorphism pressures. We propose ... [more ▼]

National higher education systems are undergoing profound changes, discussed in many but unrelated studies as outcomes of internationalisation dynamics and institutional isomorphism pressures. We propose to link these studies by emphasising the influence of both internationalisation and isomorphism on the formation of a global educational regime. Through a broad range of indicators, we describe the growth of the discursive, normative, and regulatory dimensions of such a global higher education regime. We find evidence of the following developments: (1) a rapidly growing network of international organisations focused on conferences, initiatives, and programmes supporting a global higher education agenda; (2) a striking increase in the number of international and national accreditation agencies, their mutual cross-national recognition as well as the number of universities that are nationally and internationally accredited; and lastly, (3) parallel increases in regional qualification frameworks and in the implementation of national qualification frameworks. These developments create integration pressures manifest in the mutual recognition of higher education degrees, for which a new generation of regional conventions has emerged worldwide in the past two decades. We discuss these processes and their implications for understanding ‘national’ higher education as well as the threats and limits to the burgeoning higher education regime. [less ▲]

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See detailProblematic smartphone use: An empirically validated model
Pivetta, Erika; Harkin, Lydia; Billieux, Joël UL et al

in Computers in Human Behavior (2019), 100

Given the prominent role that smartphones have in everyday life, research in the field has proliferated. From a theoretical perspective, problematic smartphone use (PSPU) is described as a multi-faceted ... [more ▼]

Given the prominent role that smartphones have in everyday life, research in the field has proliferated. From a theoretical perspective, problematic smartphone use (PSPU) is described as a multi-faceted phenomenon entailing a variety of dysfunctional manifestations (e.g., addictive, antisocial and dangerous use). To date, however, there is still a lack of empirical evidence supporting the identification of PSPU as a potential behavioural addiction. Driven by theory, the aim of the present study was to provide an empirically validated model by testing the contribution of specific factors leading to PSPU. Relationships among individual characteristics (internalised psychopathology, impulsivity and personality traits) and PSPU uses (addictive, antisocial and dangerous) were investigated according to the updated version of the theoretical framework provided by the Pathway Model of problematic smartphone use (Billieux et al., 2015). An online survey was administered to a convenience sample (N = 511) of smartphone users in order to examine their daily engagement, problematic usage patterns and related psychological correlates. Path analysis revealed important information about different PSPU components and results are discussed in light of the available literature. Recommendations for future research are proposed to further investigate the problematic behaviour, including the study of additional variables, such as the fear of missing out (FoMO), nomophobia and excessive social media use. [less ▲]

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See detailD'"Erfanne" vun der Nationalliteratur am Essai sur la poésie luxembourgeoise (1854) vum Félix Thyes
Glesener, Jeanne UL

in Millim, Anne-Marie; De Toffoli, Ian (Eds.) Madernismen in Luxemburg. Traditionen-Variationen-Brüche. Modernismes au Luxembourg. Traditions-Variations-Ruptures (2019)

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See detailInitial conditions for the marketing of demand flexibility: status quo analysis and meta study. 2 version
Buhl, Hans Ulrich; Fridgen, Gilbert UL; rner, Marc-Fabian K. O et al

Report (2019)

The present work is part of the research project "Synchronized and energy-adaptive production technology for the flexible alignment of industrial processes to a fluctuating energy supply (SynErgie ... [more ▼]

The present work is part of the research project "Synchronized and energy-adaptive production technology for the flexible alignment of industrial processes to a fluctuating energy supply (SynErgie)" funded by the Federal Ministry of Education and Research. As one of the "Kopernikus projects for the energy transition", the SynErgie research project aims to enable energy-intensive industries in Germany to adapt their electricity demand to the increasingly fluctuating electricity supply. In the past, electricity systems were usually designed so that the generation side of the market was adapted to the temporal behavior of consumption. However, due to the increased expansion of volatile renewable energies, power generation is subject to uncontrollable, weather-dependent fluctuations, which is why making the overall system more flexible is becoming increasingly important. Because the producer side can only offer the required flexibility in the form of a reduction in feed-in, there is a so-called flexibility gap. As became clear on December 14, 2018 and January 10, 2019, this flexibility gap is already pushing the power system to its limits of stability. Only through the use of many compensation mechanisms or With options for flexibility, the security of supply could just be maintained on these days. The industrial processes considered in SynErgie represent a subset of potential flexibility options and can contribute to load adjustment to fluctuating generation as well as to the provision of system services and relief of the grids. In a liberalized, competitive electricity market, the market and regulatory framework conditions are of great relevance with regard to the development of the potential for flexibility in demand. This study therefore first describes the basics of the electricity market design and the constituent legal framework. Current discussions about the basic price system (unit price system vs. zonal system vs. nodal system) are not dealt with. The processing of these discussions as well as the specific analysis of the effects of the price system on demand flexibility is the content of the work packages of the Cluster IV “Market and Electricity System” pending in SynErgie II. The present study therefore rather works on potential obstacles to the participation of flexible demand processes and always refers to the application to industrial processes. The analysis forms the basis for future work in Cluster IV and provides cross-cluster information about the status quo of market structures and regulatory framework conditions. In addition to the systematic processing of the market framework, the scientific literature and already published studies on the subject of demand flexibility (demand side management and demand response) are analyzed and summarized in a meta study. The analysis forms the basis for future work in Cluster IV and provides cross-cluster information about the status quo of market structures and regulatory framework conditions. In addition to the systematic processing of the market framework, the scientific literature and already published studies on the subject of demand flexibility (demand side management and demand response) are analyzed and summarized in a meta study. The analysis forms the basis for future work in Cluster IV and provides cross-cluster information about the status quo of market structures and regulatory framework conditions. In addition to the systematic processing of the market framework, the scientific literature and already published studies on the subject of demand flexibility (demand side management and demand response) are analyzed and summarized in a meta study. [less ▲]

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