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See detailUse of the Sideguard (Cappella) stent in bifurcation lesions: a real-world experience.
Mamas, Mamas A.; Farooq, Vasim; Latib, Azeem et al

in EuroIntervention : journal of EuroPCR in collaboration with the Working Group on Interventional Cardiology of the European Society of Cardiology (2012), 7(10), 1170-80

AIMS: The Sideguard(R) stent (Cappella Medical Devices Ltd, Galway, Ireland), is a novel nitinol self-expanding dedicated bifurcation stent that flares proximally at the ostium of the side branch (SB ... [more ▼]

AIMS: The Sideguard(R) stent (Cappella Medical Devices Ltd, Galway, Ireland), is a novel nitinol self-expanding dedicated bifurcation stent that flares proximally at the ostium of the side branch (SB) into a trumpet shape thereby achieving full ostial coverage. The aim of this study is to report the utility and limitations of this stent in patients undergoing treatment to bifurcation coronary lesions in a real-world setting. METHODS AND RESULTS: We prospectively identified 20 successive patients admitted over a 6-month period in whom there was significant SB disease and who were suitable for a bifurcation procedure. The Sideguard(R) stent was successfully used in all 20 cases including several that would have been technically difficult using conventional bifurcation techniques. We highlight use of this system using five illustrative cases that illustrate its utility and limitations in the treatment of bifurcation lesions. CONCLUSIONS: The Sideguard(R) stent can be used to treat complex bifurcation lesions in a straight forward manner and is not subject to the limitations associated with conventional bifurcation PCI techniques including jailing of the SB ostium and inability to fully cover/scaffold the ostium of the SB. [less ▲]

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See detailUSE OF TIME- AND FREQUENCY-DOMAIN APPROACHES FOR DAMAGE DETECTION IN CIVIL ENGINEERING STRUCTURES
Nguyen, Viet Ha UL; Mahowald, Jean UL; Golinval, Jean-Claude et al

in Maia, NNM; Matos Neves, M.; Chedas Sampaio, R.P. (Eds.) International Conference on Structural Engineering Dynamics (ICEDyn 2013) - Sesimbra 17-19 June 2013 (2013, June)

The aim of this paper is to apply both time- and frequency-domain-based approaches on real-life civil engineering structures and to assess their capability for damage detection. The first structure is the ... [more ▼]

The aim of this paper is to apply both time- and frequency-domain-based approaches on real-life civil engineering structures and to assess their capability for damage detection. The first structure is the Champangshiehl Bridge located in Luxembourg. Several damage levels were intentionally created by cutting a growing number of prestressed tendons and vibration data were acquired by the University of Luxembourg for each damaged state. The second example consists in reinforced and prestressed concrete panels. Successive damages were introduced in the panels by loading heavy weights and by cutting steel wires. The illustrations show different consequences in damage identification by the considered techniques. [less ▲]

Detailed reference viewed: 138 (17 UL)
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See detailUse Of Time- And Frequency-Domain Approaches For Damage Detection In Civil Engineering Structures
Nguyen, Viet Ha UL; Mahowald, Jean UL; Maas, Stefan UL et al

in Shock and Vibration (2014), 2014

The aim of this paper is to apply both time- and frequency-domain-based approaches on real-life civil engineering structures and to assess their capability for damage detection. The methodology is based ... [more ▼]

The aim of this paper is to apply both time- and frequency-domain-based approaches on real-life civil engineering structures and to assess their capability for damage detection. The methodology is based on Principal Component Analysis. The first structure is the Champangshiehl Bridge located in Luxembourg. Several damage levels were intentionally created by cutting a growing number of prestressed tendons and vibration data were acquired by the University of Luxembourg for each damaged state. The second example consists in reinforced and prestressed concrete panels. Successive damages were introduced in the panels by loading heavy weights and by cutting steel wires. The illustrations show different consequences in damage identification by the considered techniques [less ▲]

Detailed reference viewed: 134 (13 UL)
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See detailThe use of value-added models for the identification of schools that perform “against the odds”
Levy, Jessica UL; Brunner, Martin; Keller, Ulrich UL et al

Poster (2019, July)

Value-added (VA) modeling aims to quantify the effect of pedagogical actions on students’ achievement, independent of students’ backgrounds. VA modeling is primarily used for accountability and high ... [more ▼]

Value-added (VA) modeling aims to quantify the effect of pedagogical actions on students’ achievement, independent of students’ backgrounds. VA modeling is primarily used for accountability and high-stakes decisions. To date, there seems to be no consensus concerning the calculation of VA models. Our study aims to systematically analyze and compare different school VA models by using longitudinal large-scale data emerging from the Luxembourg School Monitoring Programme. Regarding the model covariates, first findings indicate the importance of language (i.e., language(s) spoken at home and prior language achievement) in VA models with either language or math achievement as a dependent variable, with the highest amount of explained variance in VA models for language. Concerning the congruence of different VA approaches, we found high correlations between school VA scores from the different models, but also high ranges between VA scores for single schools. We conclude that VA models should be used with caution and with awareness of the differences that may arise from methodological choices. Finally, we discuss the idea that VA models could be used for the identification of schools that perform “against the odds”, especially for those schools that have positive VA scores over several years. [less ▲]

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See detailUse of vitamin D supplements during infancy in an international feeding trial
Lehtonen, E.; Ormisson, A.; Nucci, A. et al

in Public Health Nutrition (2014), 17(4), 810-822

To examine the use of vitamin D supplements during infancy among the participants in an international infant feeding trial. Longitudinal study.

Detailed reference viewed: 90 (0 UL)
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See detailUser Experience challenges for designing and evaluating Computer-Based Assessments for children
Lehnert, Florence Kristin UL

in IDC '19 Proceedings of the 18th ACM International Conference on Interaction Design and Children (2019, June 12)

Computer-Based Assessment (CBA), i.e., the use of computers instead of paper & pencil for testing purposes is now increasingly used, both in education and in the workforce. Along with this trend, several ... [more ▼]

Computer-Based Assessment (CBA), i.e., the use of computers instead of paper & pencil for testing purposes is now increasingly used, both in education and in the workforce. Along with this trend, several issues regarding the usage of computers in assessment can be raised. With respect to CBA, test validity and acceptance appear at stake during interacting with a complex assessment system. For instance, individual differences in computer literacy (i.e. ability to handle technology) might cause different outcomes that are not related to the problem-solving task. Prior investigation has shown that there is a scarcity of research on the User Experience (UX) in the context of CBA, also due to a focus on adult users. This doctoral thesis aims to adapt and develop new evaluation methods from the Human-Computer Interaction (HCI) field, applied in the context of CBA. The contributions will result in the development of best practices guidelines for both research and practitioners by adopting design and evaluation methods drawn from the field of Child-computer Interaction (CCI). [less ▲]

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See detailUser Experience Design for E-Voting: How mental models align with security mechanisms
Zollinger, Marie-Laure UL; Distler, Verena UL; Roenne, Peter UL et al

in Electronic Voting (2019, October)

This paper presents a mobile application for vote-casting and vote-verification based on the Selene e-voting protocol and explains how it was developed and implemented using the User Experience Design ... [more ▼]

This paper presents a mobile application for vote-casting and vote-verification based on the Selene e-voting protocol and explains how it was developed and implemented using the User Experience Design process. The resulting interface was tested with 38 participants, and user experience data was collected via questionnaires and semi-structured interviews on user experience and perceived security. Results concerning the impact of displaying security mechanisms on UX were presented in a complementary paper. Here we expand on this analysis by studying the mental models revealed during the interviews and compare them with theoretical security notions. Finally, we propose a list of improvements for designs of future voting protocols. [less ▲]

Detailed reference viewed: 140 (12 UL)
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See detailUser Experience: a concept without consensus? Exploring practitioners' perspectives through an international survey.
Lallemand, Carine UL; Gronier, Guillaume; Koenig, Vincent UL

in Computers in Human Behavior (2015), (43), 35-48

For more than a decade, User Experience (UX) has grown into a core concept of Human–Computer Inter- action (HCI). Practitioners and researchers from a wide range of disciplines are daily working with this ... [more ▼]

For more than a decade, User Experience (UX) has grown into a core concept of Human–Computer Inter- action (HCI). Practitioners and researchers from a wide range of disciplines are daily working with this concept. However, despite many attempts to understand, define and scope UX, one may still wonder whether a consensus has been reached on this concept. In a willingness to address the complexity of this research topic and bring the concept of UX to maturity, a replication of an international survey has been conducted. The main goal of the present study is to get a better understanding of practitioners’ view- points on the notion of UX and to analyze potential evolutions over time in the understanding and prac- tical use of the concept. As both practical and theoretical implications of UX are of the greatest importance for whoever designs interactive systems, the exploration of practitioners’ perspectives is a valuable step toward continual improvement of UX activities. The present survey has been conducted amongst 758 practitioners and researchers from 35 nationalities. It allows to better understand how this concept is understood and used throughout the world. Amongst interesting results, important differences were observed according to the geographical location and background of the respondents. [less ▲]

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See detailUser Required? On the Value of User Research in the Digital Humanities
Kemman, Max UL; Kleppe, Martijn

in Linköping Electronic Conference Proceedings (2015, August 26), (116), 63-74

Although computational tools play an increasingly important role in the humanities, adoption of tools by scholars does not always reach its potential. One approach to this problem is user research to ... [more ▼]

Although computational tools play an increasingly important role in the humanities, adoption of tools by scholars does not always reach its potential. One approach to this problem is user research to uncover the needs of the users. However, it is uncertain whether such user requirements can be generalized to a wider group of humanities scholars, and whether users are able to explicate their requirements for methodological innovation. We ask what the role of user research is in the Digital Humanities by discussing gathered user requirements for two projects. We categorized the requirements as within- or out-of-scope of the projects’ goals, and found a tension between the specificity of humanities’ research methods, and generalizability for a broader applicable tool. With the out-of-scope requirements we are able to map the wider research workflow, showing DH tools will most likely take a spot in the wider workflow, and that it is infeasible to create a tool for the entire workflow that is generic enough for a larger user group. However, the within-scope requirements led to features that were sufficiently generic for the tool to be adopted, also for unintended purposes. These insights show user research has a clear benefit for DH projects. [less ▲]

Detailed reference viewed: 160 (11 UL)
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See detailUser requirements in ICT-based social media use: Acceptance of a virtual coach
Leist, Anja UL; Ferring, Dieter UL; Klauss, Kerstin et al

Scientific Conference (2011)

Detailed reference viewed: 58 (0 UL)
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See detailUser Rewarding and Distributed Payment Platforms for Mobile Crowdsensing Systems
Capponi, Andrea UL

Scientific Conference (2018, April)

Mobile Crowdsensing (MCS) has become in the last years one of the most prominent paradigms for urban sensing. In MCS systems, citizens actively participate in the sensing process by contributing data from ... [more ▼]

Mobile Crowdsensing (MCS) has become in the last years one of the most prominent paradigms for urban sensing. In MCS systems, citizens actively participate in the sensing process by contributing data from their mobile devices. To make e ective a MCS campaign, large participation is fundamental. Users sustain costs to contribute data and they may be reluctant in joining the sensing process. Hence, it is essential to incentivize participants. Several incentive mechanisms have been investigated, such as monetary rewarding. In this context, distributed payment platforms based on custom built blockchains assume a fundamental role. We aim to develop a platform to distribute micro-payments following rewarding schemes. The key idea is to di erentiate between users through several parameters, such as the amount of acquired data and the Quality of Information (QoI), according to the particular campaign and the need of the organizers. [less ▲]

Detailed reference viewed: 98 (6 UL)
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See detailUser Scheduling for Coordinated Dual Satellite Systems with Linear Precoding
Christopoulos, Dimitrios UL; Chatzinotas, Symeon UL; Ottersten, Björn UL

in International Communications Conference, Budapest 2013 (2013)

Detailed reference viewed: 206 (31 UL)
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See detailUser Scheduling in Cooperative Satellite Systems
Christopoulos, Dimitrios UL; Chatzinotas, Symeon UL; Ottersten, Björn UL

in Cooperative and Cognitive Satellite Systems (2015)

Detailed reference viewed: 160 (13 UL)
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See detailUser Selection based on Inter-channel Interference for Massive MIMO under Line-of-sight Propagation
Chaves, Rafael S.; Cetin, Ediz; Lima, Markus V. S. et al

in URSI GASS 2021, Rome 28 August - 4 September 2021 (2021)

Massive multiple-input multiple-output (MIMO) is seen as a key enabler for next-generation wireless communication systems. Increased throughput afforded by massive MIMO, however, may severely degrade when ... [more ▼]

Massive multiple-input multiple-output (MIMO) is seen as a key enabler for next-generation wireless communication systems. Increased throughput afforded by massive MIMO, however, may severely degrade when the number of users served by a single base station increases, calling for user scheduling algorithms. To deal with this problem, a new user selection algorithm, called inter-channel interference-based selection (ICIBS), is proposed. ICIBS drops those users that induce the highest interference to the remaining users. Simulations show that selecting users with ICIBS significantly improves the throughput, outperforming state-of-the-art user selection algorithms. [less ▲]

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See detailUser Selection for symbol-level multigroup multicasting precoding in the downlink of MISO channels
Alodeh, Maha UL; Chatzinotas, Symeon UL; Ottersten, Björn UL

in 2018 IEEE International Conference on Communications (ICC) (2018)

We consider the problem of user selection for symbol-level multigroup multicasting in the downlink of multiuser MISO systems. Symbol-level precoding is a new paradigm for multiuser multiple-antenna ... [more ▼]

We consider the problem of user selection for symbol-level multigroup multicasting in the downlink of multiuser MISO systems. Symbol-level precoding is a new paradigm for multiuser multiple-antenna downlink systems which aims at creating constructive interference among the simultaneous data streams. This can be enabled by designing the precoded signal of the multiantenna transmitter on a symbol level, taking into account both channel state information and data symbols. This work proposes a user selection algorithm to facilitate serving multiple groups of users, by transmitting a stream of common symbols to each group on symbol-by-symbol basis if we have large number of users. We provide numerical results to validate the proposed algorithm. [less ▲]

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See detailUser Study on Remotely Controlled UAVs with Focus on Interfaces and Data Link Quality
Riestock, Maik; Engelhard, Frank; Zug, Sebastian et al

in IEEE/RAS International Conference on Intelligent Robots and Systems (2017)

Detailed reference viewed: 98 (2 UL)
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See detailUser Terminal Wideband Modem for Very High Throughput Satellites
Kisseleff, Steven UL; Maturo, Nicola UL; Chatzinotas, Symeon UL et al

in 37th International Communications Satellite Systems Conference (ICSSC), Japan, October 2019 (2019, November)

Detailed reference viewed: 50 (5 UL)
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See detailUser’s guide to apply, configure and adapt the Genetics Lab
Sonnleitner, Philipp UL; Mayer, Hélène; Keller, Ulrich UL et al

E-print/Working paper (2012)

Detailed reference viewed: 54 (2 UL)
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See detailUser-Centered Activity Management System for Elderly People
Otjacques, Benoît; Krier, Marc; Feltz, Fernand et al

in International Conference on Pervasive Computing Technologies for Healthcare (2009)

Abstract — This paper presents the preliminary results of a multi-disciplinary project aiming at studying technology supported life in a retirement home. The results of semistructured interviews conducted ... [more ▼]

Abstract — This paper presents the preliminary results of a multi-disciplinary project aiming at studying technology supported life in a retirement home. The results of semistructured interviews conducted with a group of 40 (semi-) autonomously living elderly persons are presented. In general they point in the direction of a “differential indication” of technologies in the sense of identifying personal solution for individual needs. Second, results show that the crucial dimension underlying the acceptance of technologies is the notion of personal control. The paper also identifies ten key design factors to build successful applications for elderly people. Finally an initial version of a new system mixing RFID, tactile screen and large display is described. [less ▲]

Detailed reference viewed: 65 (2 UL)