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See detailItem‐Austausch im Rahmen des DACHL – Konzeptvorschlag
Fischbach, Antoine UL; Martin, Romain UL

Presentation (2011, October)

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See detailiTEO
Kirsch, Claudine UL

Scientific Conference (2015, November 26)

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See detailiTEO als Tool zur Sprachentwicklung mehrsprachiger Kinder
Kirsch, Claudine UL

Scientific Conference (2016, February 18)

Dieser Workshop beleuchtet Eckpfeiler des Sprachenlernens wie zum Beispiel das Aufbauen auf den Ressourcen des Kindes, die Qualität des sprachlichen Inputs und der Interaktionen, die Wichtigkeit des ... [more ▼]

Dieser Workshop beleuchtet Eckpfeiler des Sprachenlernens wie zum Beispiel das Aufbauen auf den Ressourcen des Kindes, die Qualität des sprachlichen Inputs und der Interaktionen, die Wichtigkeit des sinnvollen Inhaltes und des Kontextes sowie die Bedeutung der Rückmeldung und der Reflektion über die Sprache. Theoriegeleitet werden wir Filmmaterial analysieren, das illustriert, wie Kindern des C1 und C2 mit iTEO arbeiten, Texte konstruieren und voneinander lernen. [less ▲]

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See detailiTEO as a translanguaging and learning space
Kirsch, Claudine UL; Bes Izuel, Maria Asuncion UL

Scientific Conference (2016, June 10)

The present paper investigates translanguaging practices and types of talk of 6 to 8 year-old multilinguals who record texts on the App iTEO in Luxembourg. ITEO enables users to record and edit oral text ... [more ▼]

The present paper investigates translanguaging practices and types of talk of 6 to 8 year-old multilinguals who record texts on the App iTEO in Luxembourg. ITEO enables users to record and edit oral text, to listen to recordings and to structure the recording process. The automatic playback materializes the language and provides opportunities for reflection. The collective process of recording and transforming texts presents children with opportunities to use exploratory talk proven to stimulate learning (Mercer 2000, 2004). Our qualitative longitudinal study focuses on the use of iTEO for teaching and learning languages in nursery and primary schools (http://storying.bsce.uni.lu/). The study’s multi-method approach, with data collected over two years, includes: observations of activities involving iTEO, video recording of children`s storying, interviews with all participants and the collection of documents. The data analysis followed the principles of Grounded Theory (Charmaz 2006, Strauss & Corbin 1990) and was assisted by the programme Nvivo. Findings have shown that children develop linguistic and metalinguistic competences and that they translanguage regularly while working with iTEO (Gretsch 2014, Kirsch & Gretsch, 2015). In this paper, we discuss a case study of children in the first grades of primary school with the following purposes: 1. To identify instances of translanguaging; 2. To analyze the different kinds of discourse emerging during the co-construction of text on iTEO; and 3. To show how these contribute to learning. We argue that iTEO creates a translanguaging space (García & Wei 2014), where children can draw on their entire repertoire in order to learn. Embedded in multilingual pedagogies, iTEO helps learners to co-construct linguistic knowledge through different types of talk. The results of our case study will contribute to a deeper understanding of the ways in which multilingual children translanguage and use different types of talk in autonomous, collaborative and computer-assisted activities. References Charmaz, K. 2006. Constructing Grounded Theory. A Practical Guide Through Qualitative Analysis. London: Sage. Garcia, O. & W. Li. 2014. Translanguaging: Language, Bilingualism and Education. New York: Basingstoke: Palgrave MacMillan. Kirsch, C. 2014, Storytelling at home and at the nursery school: A study of bilingual children`s literacy practices, in Morys N., C. Kirsch, I. De Saint-Georges and G. Gretsch, Lernen und Lehren in multilingualen Kontexten: Zum Umgang mit sprachlich-kultureller Vielfalt in Klassenraum. Frankfurt, Peter Lang Verlag, 219-246. Kirsch, C. and G. Gretsch. 2015. L`apprentissage langagier avec l`app iTEO, Multilinguisme: enseignement, littératures et cultures au Luxembourg, Synergies pays germanophones, Gerflint, 2015 (8), 37-48. Mercer, N. 2000. Words and minds: how we use language to think together. London: Routledge. Mercer, N. 2004. Sociocultural discourse analysis: Analysing a classroom talk as a social mode of thinking. Journal of Applied Linguistics, vol. 1(2): 137-168. Strauss, A. & J. Corbin. 1990. Basics of Qualitative Research: Grounded Theory Procedures and Techniques. Newbury Park: Sage. [less ▲]

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See detailiTEO – ein Tool zur Valorisierung der Mehrsprachigkeit
Kirsch, Claudine UL; Gretsch, Gérard UL

Scientific Conference (2013, June 28)

iTEO ist eine iPad App, die es ermöglicht, Sprache aufzunehmen und Texte (Wörter, Sätze) zu editieren. Wir setzten iTEO in verschiedenen Grundschulklassen in Luxemburg ein, um zu untersuchen, wie Kinder ... [more ▼]

iTEO ist eine iPad App, die es ermöglicht, Sprache aufzunehmen und Texte (Wörter, Sätze) zu editieren. Wir setzten iTEO in verschiedenen Grundschulklassen in Luxemburg ein, um zu untersuchen, wie Kinder und Lehrpersonen das Tool zur Sprachförderung im Unterricht einsetzen. Die Ergebnisse unserer Studien zeigen, dass Kinder, die gemeinsam mit Kameraden Geschichten erzählten, ihre Sprache entwickelten (z.B. Wortschatz, Grammatik, diskursive Kompetenzen), sich metalinguistisches Wissen aneigneten und Lernstrategien erwarben. [less ▲]

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See detailiTEO, a learning and teaching tool that valorises and promotes language diverity
Kirsch, Claudine UL

Scientific Conference (2013, July 08)

Luxembourg’s multilingualism and multiculturalism are reflected both in its trilingual education system and its diverse school population. However, despite the official policy of trilingualism, language ... [more ▼]

Luxembourg’s multilingualism and multiculturalism are reflected both in its trilingual education system and its diverse school population. However, despite the official policy of trilingualism, language learning programmes tend to be underpinned by a monoglossic view that sees languages as autonomous skills that need to be developed separately. Statistics have repeatedly shown that ethnic minority children, 48% of the school population, underachieve. In response, the ministry of Education has developed approaches to further the development of multiple languages. However, these are neither sufficiently specific nor systematic. Our project addresses the need for the development of appropriate didactics and of innovative strategies to cope with the diversity and heterogeneity in Luxembourg’s schools. We believe in working with rather than against the diversity of the school population and base our understanding of language learning on sociocultural theories. We investigate how young children of ethnic minority background learn Luxembourgish, German and French through collaborative storytelling on the iPAD App iTEO and how teachers support their learning with this new technology. The App iTEO is a learning-and-teaching tool that records and edits language. It structures the learning process, mediates language learning and promotes metalinguistic awareness. Findings of the pilot study have shown that the tool facilitates children’s collaborative, exploratory and open-ended language learning and allows children to draw on their diverse language repertoires and to deploy a range of strategies. [less ▲]

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See detailIterated Local Search for de Novo Genomic Sequencing
Dorronsoro, Bernabé UL; Bouvry, Pascal UL; Alba, Enrique

in Lecture Notes in Computer Science (2010), 6114

The sequencing process of a DNA chain for reading its components supposes a complex process, since only small DNA fragments can be read nowadays. Therefore, the use of optimization algorithms is required ... [more ▼]

The sequencing process of a DNA chain for reading its components supposes a complex process, since only small DNA fragments can be read nowadays. Therefore, the use of optimization algorithms is required to rebuild a single chain from all the small pieces. We address here a simplified version of the problem, in which no errors in the sequencing process are allowed. The methods typically used in the literature for this problem are not satisfactory when solving realistic size instances, so there is a need for new more efficient and accurate methods. We propose a new iterated local search algorithm, highly competitive with the best algorithms in the literature, and considerably faster. [less ▲]

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See detailAn Iterative Approach to Nonconvex QCQP with Applications in Signal Processing
Gharanjik, Ahmad UL; Shankar, Bhavani UL; Soltanalian, Mojtaba et al

in 2016 IEEE Sensor Array and Multichannel Signal Processing Workshop (SAM) (2016, July 10)

This paper introduces a new iterative approach to solve or to approximate the solutions of the nonconvex quadratically constrained quadratic programs (QCQP). First, this constrained problem is transformed ... [more ▼]

This paper introduces a new iterative approach to solve or to approximate the solutions of the nonconvex quadratically constrained quadratic programs (QCQP). First, this constrained problem is transformed to an unconstrained problem using a specialized penalty-based method. A tight upper-bound for the alternative unconstrained objective is introduced. Then an efficient minimization approach to the alternative unconstrained objective is proposed and further studied. The proposed approach involves power iterations and minimization of a convex scalar function in each iteration, which are computationally fast. The important design problem of multigroup multicast beamforming is formulated as a nonconvex QCQP and solved using the proposed method. [less ▲]

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See detailIterative design of mobile learning systems for school projects
Melzer, André UL; Hadley, L.; Glasemann, M. et al

in Technology, Instruction, Cognition & Learning (2009), 6(4), 235-251

Different approaches have been proposed on the design and development of digital and interactive technology in mobile learning contexts. In line with recent findings in literature, we suggest that mobile ... [more ▼]

Different approaches have been proposed on the design and development of digital and interactive technology in mobile learning contexts. In line with recent findings in literature, we suggest that mobile learning systems benefit from a criteria-based iterative design and development process that incorporates evaluation results of mobile learning scenarios based on school curricula. Underlying these scenarios is a holistic, socio-technical system view, which makes allowance for the complex dynamics between teachers, students, researchers, the multiplicity of contextual factors, and the specifications and requirements of the digital devices and applications, as well as their interrelations. Five school project scenarios are described, as well as the evaluation process involved that served as an integral part in creating a dynamic optimization process for the design and development of digital and interactive systems that follow efficiency criteria for mobile learning (i.e., construction, contextualization, communication, and control). In addition, we argue that mobile systems should also allow for users’ or students’ participatory activities in the preparation phase to bridge the gap between indoor and outdoor learning. [less ▲]

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See detailAn iterative economic residential choice ABM of urban growth in Luxembourg (extended abstract)
Caruso, Geoffrey UL; Medard de Chardon, Cyrille UL

in Pinto N (Ed.) Proceedings of the Symposium on Cellular Automata Models of Urban and Spatial Systems (2012)

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See detailAn iterative learning approach for anticipatory traffic signal control on urban networks
Huang, Wei; Viti, Francesco UL; Tampere, Chris

in Transportmetrica B: Transport Dynamics (2016)

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See detailAn iterative learning approach for anticipatory traffic signal control on urban networks
Huang, Wei; Viti, Francesco UL; Tampere, Chris

in Transportmetrica B: Transport Dynamics (2017), 5(4), 407-430

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See detailAn Iterative Learning Approach for Signal Control in Urban Traffic Networks
Huang, Wei; Viti, Francesco UL; Tampere, Chris M.J.

in Proceedings of IEEE-ITS Conference (2013)

Traffic signal control influences route choice in traffic networks, and may even determine whether a traffic system settles in equilibrium or destabilizes into oscillatory patterns. Ideally, a stable ... [more ▼]

Traffic signal control influences route choice in traffic networks, and may even determine whether a traffic system settles in equilibrium or destabilizes into oscillatory patterns. Ideally, a stable equilibrium flow pattern should result from the interaction between control and route choice on a long-term horizon. This paper proposes an iterative learning approach for designing signal controls able to attract the system to equilibrium in an acceptable convergence speed. The traffic assignment model and combined traffic assignment and control problem are first introduced. An iterative learning control (ILC) based signal control is formulated and a basic model inversion method is analyzed. To deal with the nonlinearity of traffic system, a Newton based ILC algorithm is applied. Test in an example network verifies the effectiveness of the ILC method in achieving stable equilibrium in the traffic system. [less ▲]

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See detailAn iterative Mixed Integer Linear Programming Approach to pursuit evasion problems in polygonal environments
Thunberg, Johan UL; Ögren, P.

in Proceedings of the 2010 IEEE International Conference on Robotics and Automation (ICRA) (2010)

In this paper, we address the multi pursuer version of the pursuit evasion problem in polygonal environments. It is well known that this problem is NP-hard, and therefore we seek efficient, but not ... [more ▼]

In this paper, we address the multi pursuer version of the pursuit evasion problem in polygonal environments. It is well known that this problem is NP-hard, and therefore we seek efficient, but not optimal, solutions by relaxing the problem and applying the tools of Mixed Integer Linear Programming (MILP) and Receding Horizon Control (RHC). Approaches using MILP and RHC are known to produce efficient algorithms in other path planning domains, such as obstacle avoidance. Here we show how the MILP formalism can be used in a pursuit evasion setting to capture the motion of the pursuers as well as the partitioning of the pursuit search region into a cleared and a contaminated part. RHC is furthermore a well known way of balancing performance and computation requirements by iteratively solving path planning problems over a receding planning horizon, and adapt the length of that horizon to the computational resources available. The proposed approach is implemented in Matlab/Cplex and illustrated by a number of solved examples. [less ▲]

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See detailIterative observer-based state and parameter estimation for linear systems
Aalto, Atte UL

in ESAIM: Control, Optimisation and Calculus of Variations (2018), 24(1), 265-288

We propose an iterative method for joint state and parameter estimation using measurements on a time interval [0,T] for systems that are backward output stabilizable. Since this time interval is fixed ... [more ▼]

We propose an iterative method for joint state and parameter estimation using measurements on a time interval [0,T] for systems that are backward output stabilizable. Since this time interval is fixed, errors in initial state may have a big impact on the parameter estimate. We propose to use the back and forth nudging (BFN) method for estimating the system’s initial state and a Gauss–Newton step between BFN iterations for estimating the system parameters. Taking advantage of results on the optimality of the BFN method, we show that for systems with skew-adjoint generators, the initial state and parameter estimate minimizing an output error cost functional is an attractive fixed point for the proposed method. We treat both linear source estimation and bilinear parameter estimation problems. [less ▲]

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See detailIterative optimization for adaptive anticipatory control in urban traffic networks
Huang, Wei; Viti, Francesco UL; Tampere, Chris M.J.

Scientific Conference (2015, July)

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See detailIterative Precoder Design and User Scheduling for Block-Diagonalized Systems
Tran, Le-Nam; Bengtsson, Mats; Ottersten, Björn UL

in IEEE Transactions on Signal Processing (2012), 60(7), 3726-3739

The block diagonalization (BD) scheme is a low-complexity suboptimal precoding technique for multiuser multiple input-multiple output (MIMO) downlink channels, which completely precancels the multiuser ... [more ▼]

The block diagonalization (BD) scheme is a low-complexity suboptimal precoding technique for multiuser multiple input-multiple output (MIMO) downlink channels, which completely precancels the multiuser interference. Accordingly, the precoder of each user lies in the null space of other users' channel matrices. In this paper, we propose an iterative algorithm using QR decompositions (QRDs) to compute the precoders. Specifically, to avoid dealing with a large concatenated matrix, we apply the QRD to a sequence of matrices of lower dimensions. One problem of BD schemes is that the number of users that can be simultaneously supported is limited due to zero interference constraints. When the number of users is large, a set of users must be selected, and selection algorithms should be designed to exploit the multiuser diversity gain. Finding the optimal set of users requires an exhaustive search, which has too high computational complexity to be practically useful. Based on the iterative precoder design, this paper proposes a low-complexity user selection algorithm using a greedy method, in which the precoders of selected users are recursively updated after each selection step. The selection metric of the proposed scheduling algorithm relies on the product of the squared row norms of the effective channel matrices, which is related to the eigenvalues by the Hadamard and Schur inequalities. An asymptotic analysis is provided to show that the proposed algorithm can achieve the optimal sum rate scaling of the MIMO broadcast channel. The numerical results show that the proposed algorithm achieves a good trade-off between sum rate performance and computational complexity. When users suffer different channel conditions, providing fairness among users is of critical importance. To address this problem, we also propose two fair scheduling (FS) algorithms, one imposing fairness in the approximation of the data rate, and another directly imposing fairness in the product of the sq- ared row norms of the effective channel matrices. [less ▲]

Detailed reference viewed: 103 (2 UL)