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See detailA New Synchronization Method for Three - phase Grid - tied LC-Filtered Voltage Source Inverters
Kobou Ngani, Patrick UL; Hadji-Minaglou, Jean-Régis UL; De Jaeger, Emmanuel et al

in International Journal of Emerging Engineering Research and Technology (2017), 5(5), 7-15

In order to identify and to track the phase angle and magnitude of the grid voltage, several synchronization methods exist, among which the phase-locked loop (PLL) algorithm is the most popular. This ... [more ▼]

In order to identify and to track the phase angle and magnitude of the grid voltage, several synchronization methods exist, among which the phase-locked loop (PLL) algorithm is the most popular. This paper presents a new synchronization method for grid-tied voltage source inverters (VSIs) based on the intrinsic inverter synchronous reference frame. The absolute phase angle of the grid voltage is not required but its voltage direct and quadrature components into the well-known inverter frame. The advantages of this method is its low computational load with a reduced number of control parameters, as well as its robustness and effectiveness. This property makes it very convenient for embedded control systems with limited computing resources. Simulations and experimental test results are presented to prove the performance of the proposed method. [less ▲]

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See detailNew synthetic opioids: Part of a new addiction landscape.
Karila, Laurent; Marillier, Maude; Chaumette, Boris et al

in Neuroscience and biobehavioral reviews (2019), 106

Synthetic opioids (SO) are a major risk for public health across the world. These drugs can be divided into 2 categories, pharmaceutical and non-pharmaceutical fentanyls. A new generation of SO has ... [more ▼]

Synthetic opioids (SO) are a major risk for public health across the world. These drugs can be divided into 2 categories, pharmaceutical and non-pharmaceutical fentanyls. A new generation of SO has emerged on the drug market since 2010. North America is currently facing an opioid epidemic of morbi-mortality, caused by over-prescription of opioids, illegally diverted prescribed medicines, the increasing use of heroin, is and the emergence of SO. Furthermore, this opioid crisis is also seen in Europe. SO are new psychoactive substances characterized by different feature such as easy availability on the Internet, low price, purity, legality, and lack of detection in laboratory tests. They have not been approved or are not recommended for human use. Opioid misuse is associated with somatic and psychiatric complications. For many substances, limited pharmacological information is available, increasing the risk of harmful adverse events. Health actors and the general population need to be clearly informed of the potential risks and consequences of the diffusion and use of SO. [less ▲]

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See detailNew Target Genes of MITF-Induced microRNA-211 Contribute to Melanoma Cell Invasion
Margue, Christiane UL; Philippidou, Demetra UL; Reinsbach, Susanne UL et al

in PLoS ONE (2013), 8(9),

The non-coding microRNAs (miRNA) have tissue- and disease-specific expression patterns. They down-regulate target mRNAs, which likely impacts on most fundamental cellular processes. Differential ... [more ▼]

The non-coding microRNAs (miRNA) have tissue- and disease-specific expression patterns. They down-regulate target mRNAs, which likely impacts on most fundamental cellular processes. Differential expression patterns of miRNAs are currently being exploited for identification of biomarkers for early disease diagnosis, prediction of progression for melanoma and other cancers and as promising drug targets, since they can easily be inhibited or replaced in a given cellular context. Before successfully manipulating miRNAs in clinical settings, their precise expression levels, endogenous functions and thus their target genes have to be determined. MiR-211, a melanocyte lineage-specific small non-coding miRNA, is located in an intron of TRPM1, a target gene of the microphtalmia-associated transcription factor (MITF). By transcriptionally up-regulating TRPM1, MITF, which is critical for both melanocyte differentiation and survival and for melanoma progression, indirectly drives the expression of miR-211. Expression of this miRNA is often reduced in melanoma samples. Here, we investigated functional roles of miR-211 by identifying and studying new target genes. We show that MITF-correlated miR-211 expression levels are mostly but not always reduced in a panel of 11 melanoma cell lines and in primary and metastatic melanoma compared to normal melanocytes and nevi, respectively. MiR-211 itself only marginally impacted on cell invasion and migration, while perturbation of some new miR-211 target genes, such as AP1S2, SOX11, IGFBP5, and SERINC3 significantly increased invasion. These results and the variable expression levels of miR-211 raise serious doubts on the value of miR-211 as a melanoma tumor-suppressing miRNA and/or as a biomarker for melanoma. [less ▲]

Detailed reference viewed: 146 (16 UL)
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See detailNew Technical Expertises of Multi-Sensor Analysers for Odour Evaluation and Applications in Liquid Measuring Instruments
Giebel, Stefan Markus; Frechen, Franz-Bernd; Franke, Wolfgang et al

Scientific Conference (2009, March 30)

Detailed reference viewed: 13 (0 UL)
See detailNew technologies in psychological assessment. The example of computer-based collaborative problem solving assessment.
Krkovic, Katarina UL; Pasztor-Kovacs, Anita; Molnar, Gyöngyvér et al

in International Journal of e-Assessment (2014), 1

Detailed reference viewed: 116 (2 UL)
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See detailNew technologies in psychological assessment: The example of computer-based collaborative problem solving assessment
Krkovic, Katarina UL; Pasztor-Kovacs, A.; Molnar, G. et al

Scientific Conference (2013, July 09)

Detailed reference viewed: 71 (4 UL)
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See detailA new test of linear hypothesis in regression
Baraud, Yannick UL; Huet, S.; Laurent, B.

in Goodness-of-fit tests and model validity (Paris, 2000) (2002)

Detailed reference viewed: 50 (3 UL)
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See detailA new thickness-based accelerated aging test methodology for resin materials: theory and preliminary experimental study
Wang, Yanlei; Zhang, Xue; Gaochuang, Cai et al

in Construction and Building Materials (2018)

Detailed reference viewed: 192 (23 UL)
See detailNew tools for conviviality. Masks, norms, ontology, requirements and measures. Bridging the conviviality gap between policy and informatics
Caire, Patrice UL

Doctoral thesis (2010)

The notion of conviviality has an intuitive meaning for human society, which is to feel welcome in a community and at ease with its members. We believe it also has particular significance for the design ... [more ▼]

The notion of conviviality has an intuitive meaning for human society, which is to feel welcome in a community and at ease with its members. We believe it also has particular significance for the design of artificial social systems. Traditionally conviviality has been shown to be useful in human interactions, thus the abundance of artificial social systems is likely to benefit from its application. In this thesis, we explore the possibility of developing the concept of conviviality in artificial social systems in depth. We provide a number of tools to help designers of artificial social systems to include conviviality at the onset of their design. First, we identify what we believe to constitute a promising field of research. Second, we abstract the notion of conviviality. Starting from the philosophical notion proposed by Illich, “individual freedom realized in personal interdependence”. Using Taylor’s intuition about a conviviality mask, we advance a formalization in terms of interdependence of agents and their goals, and the social norms that determine that interdependence. Third, we operationalize conviviality for the development of artificial social systems. We establish correspondence between software engineering and social science domains. We formalize the interdependence between members of a group with dependence networks, and use the stakeholder-agent concept to pro- vide individual agents’ points of view. Fourth, we propose a way to elicit conviviality requirements during the early phase of the development of artificial social systems, using the Tropos agent methodology. Finally, we provide a glimpse of the type of conviviality properties that can be measured in artificial social systems, and thus define the convivial quality of the system. Throughout this thesis we illustrate our arguments with two running examples, one from Second Life, the other from the city of Luxembourg. [less ▲]

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See detailNew tools for self-organised pattern formation
Bernhardt, K.; Carter, E. J.; Chand, N. S. et al

in IET Synthetic Biology (2007), 1(1.2), 29-31

Position-dependent gene expression is a critical aspect of the development and behaviour of multicellular organisms. It requires a complex series of interactions to occur between different cell types in ... [more ▼]

Position-dependent gene expression is a critical aspect of the development and behaviour of multicellular organisms. It requires a complex series of interactions to occur between different cell types in addition to intracellular signalling cascades. We used Escherichia coli to study the properties of an artificial signalling system at the interface between two expanding cell populations. We genetically engineered one population to produce a diffusible acyl-homoserine lactone (AHL) signal, and another population to respond to it. Our experiments demonstrate how such a signal can be used to reproducibly generate simple visible patterns with high accuracy in swimming agar. The producing and responding cassettes of two such signalling systems can be linked to produce a symmetric interface for bidirectional communication that can be used to visualise molecular logic. Intracellular feedback between these two cassetteswould then create a framework for self-organised patterning of higher complexity. Adapting the experiments of Basu et al. (Basu et al., 2005) using cell motility, rather than a differential response to AHL concentrations as a way to define zones of response, we noted how the interaction of sender and receiver cell populations on a swimming plate could lead to complex pattern formation. Equipping highly motile strains such as E. coli MC1000 with AHL-mediated autoinducing systems based on Vibrio fischeri luxI/luxR and Pseudomonas aeruginosa lasI/lasR cassettes would allow the amplification of a response to an AHL signal and its propagation. We designed and synthesised codon-optimised auto-inducing luxI/R and lasI/R cassettes as optimal gene expression is crucial for the generation of robust patterns. We still have to complete and test the entire genetic circuitry, although by modelling the system we were able to demonstrate its feasibility. [less ▲]

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See detailNew trading risk indexes: application of the shapley value in finance
Terraza, Virginie UL; Mussard, Stéphane

in Economics Bulletin (2007), 3(25), 1-7

The aim of this paper is to offer new risk indicators that enable one to classify securities of a portfolio according to their risk degrees. These indexes are issued from a new method of the covariance ... [more ▼]

The aim of this paper is to offer new risk indicators that enable one to classify securities of a portfolio according to their risk degrees. These indexes are issued from a new method of the covariance decomposition based on the Shapley Value. The risk indicators are computed via the well-known Gini coefficient, which is viewed as a new risk measure and compared with the traditional measures related with the modern theory of portfolio. These indicators yield suitable information, which could be used by private or institutional investors to trade strategies on market portfolio. [less ▲]

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See detailNew Trends in Observer-based Control: An Introduction to Design Approaches and Engineering Applications, Chapter 13: Observer-based Event-triggered Attack-Tolerant Control Design for Cyber-physical Systems
Bezzaoucha, Souad UL; Voos, Holger UL

in New Trends in Observer-based Control: An Introduction to Design Approaches and Engineering Applications, Chapter 13: Observer-based Event-triggered Attack-Tolerant Control Design for Cyber-physical Systems (2019)

In the following chapter, we first introduce an appropriate model associating paradigms from control theory and computer science (system subject to both physical attacks and sensors/actuators attacks via ... [more ▼]

In the following chapter, we first introduce an appropriate model associating paradigms from control theory and computer science (system subject to both physical attacks and sensors/actuators attacks via the connected network, i.e., false-data injection attacks on actuators/sensors). Then, inspired by a combination between the classical fault-tolerant control (FTC) approach and the event-triggered control, an observer-based attack-tolerant control solution is proposed. The aim of our work is, first, to establish theoretical foundations for the development of model-based monitoring and attack-tolerant control for reliable deployment of a large number of advanced Cyber-Physical Systems. [less ▲]

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See detailNew unified H-infinity dynamic observer design for linear systems with unknown inputs
Gao, Nan; Darouach, Mohamed; Voos, Holger UL et al

in Automatica (2016), 65

In this paper, a unified dynamic observer (UO) is proposed for a class of linear systems in the presence of unknown inputs and disturbances. It generalizes the existing results on the proportional ... [more ▼]

In this paper, a unified dynamic observer (UO) is proposed for a class of linear systems in the presence of unknown inputs and disturbances. It generalizes the existing results on the proportional observer (PO), the proportional integral observer (PIO) and the dynamic observer (DO). The design approach of the UO is derived from the solution of the linear matrix inequality (LMI), based on the new dynamic observer formulation and the solution of the algebraic constraints obtained from the unbiased estimation error. A numerical example is provided to show the applicability and the performance of our results. [less ▲]

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See detailA new variant of the differential gravimetry approach
Weigelt, Matthias UL; van Dam, Tonie UL; Bandikova, T.

Scientific Conference (2013, June)

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See detailA New Vertical Land Movements Data Set from a Reprocessing of GNSS at Tide Gauge Stations
Hunegnaw, Addisu UL; Klos, Anna; Hansen, Dionne et al

Scientific Conference (2016, July 30)

The main objective of the International GNSS Service (IGS) Tide Gauge Benchmark Monitoring (TIGA) Working Group is to provide accurate coordinates and changes in them in the form of long-term trends for ... [more ▼]

The main objective of the International GNSS Service (IGS) Tide Gauge Benchmark Monitoring (TIGA) Working Group is to provide accurate coordinates and changes in them in the form of long-term trends for globally distributed Global Navigation Satellite System (GNSS) stations at or close to tide gauges (TGs). Mean sea level (MSL) records derived from TG observations measure sea level relative to benchmarks on the land and structures supporting the TGs. Therefore, any changes in land levels affect the MSL records and the computed estimates of sea level change, ie. the MSL trends. In order to compute regionally or globally averaged MSL required for climate studies, these MSL trends have to be corrected for the vertical land movements (VLMs) derived from the GNSS observations. In this study, we have estimated a new set of VLMs at or close to TGs from the recent reprocessing campaign “repro2” undertaken by British Isles continuous GNSS Facility and University of Luxembourg TIGA Analysis Center (BLT). The position time series of more than 700 stations distributed around the world have been reprocessed for the period 1994 to 2015 using the latest bias models and processing strategies following the conventions of the International Earth Rotation and Reference Frame Service (IERS). It is well known that position time series are affected by discontinuities, which stem from different sources such as earthquakes, hardware changes and other artificial offsets that do not reflect real geophysical events. Since uncorrected discontinuities adversely affect the trend estimates, we have, after applying all known offset epochs, inspected the time series of all stations manually and added any further offset epochs required during the analysis. We have included a total of 2500+ discontinuities of which two-thirds are from hardware changes, 4% from earthquakes and 9% from unknown sources. We fit a deterministic model (sum of linear trend and seasonal terms) to the position time series using the Hector software package. As expected the annual terms show the highest power with amplitudes of a few millimeters. The stochastic model for estimating trend and associated uncertainties follows a power-law noise process as has previously been described as optimal for GNSS-derived position time series. The new set of VLM estimates from our repro2 solution is evaluated through comparison with a published GNSS solution, the recent ICE-6G model of glacial isostatic adjustment and by application to the latest release of MSL trends from the Permanent Service For Mean Sea Level. [less ▲]

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See detailA new ‘logic’ of emancipation: The methodology of Jacques Ranciere.
Biesta, Gert UL

in Educational Theory (2010), 60(1), 39-59

Detailed reference viewed: 132 (0 UL)
See detailNewcomers’ translanguaging practices in learning situations
Degano, Sarah UL

Presentation (2019, November 06)

To expand learning opportunities for all students in bilingual schools, including newly-arrived ones, a growing number of scholars advocate for implementing translanguaging pedagogies that leverage the ... [more ▼]

To expand learning opportunities for all students in bilingual schools, including newly-arrived ones, a growing number of scholars advocate for implementing translanguaging pedagogies that leverage the students’ full range of semiotic resources (García et al. 2012). Yet, research which focusses on the newcomers’ translanguaging practices and involves multiple languages remains scarce. Counting less than 2% of Luxembourg’s primary school population (MENEJ 2018), newly-arrived students face an important educational challenge as the instruction of French, German and Luxembourgish accounts for 40.5% of all curricular time. While the present doctoral project investigates the language practices of fourth-graders of different language and migration backgrounds, this paper explores the extent to which two newcomers from different schools, Portuguese-speaking Harry and Slovenian-speaking Leon, mobilize their semiotic resources to learn curricular content in French and Science lessons while interacting with their peers and teachers. Data stem from forty-two days of observation throughout Years 4 and 5, approximately twenty hours of video-recordings and four semi-structured interviews with the students about some of the recorded events. Findings first show that, with peers, Harry and Leon used all institutional languages to discuss curricular content and Harry additionally used Portuguese and English. Second, with teachers, Leon flexibly used all institutional languages, but Harry did not. Third, both newcomers regularly translanguaged in Year 4 but almost completely dropped this practice in Year 5. The students’ differing translanguaging practices likely connect to the language practices of their interlocutors and the learning situations within the classroom contexts. [less ▲]

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See detailA newform theory for Katz modular forms
Berhanu, Daniel UL

E-print/Working paper (2020)

In this paper, a strong multiplicity one theorem for Katz modular forms is studied. We show that a cuspidal Katz eigenform which admits an irreducible Galois representation is in the level and weight old ... [more ▼]

In this paper, a strong multiplicity one theorem for Katz modular forms is studied. We show that a cuspidal Katz eigenform which admits an irreducible Galois representation is in the level and weight old space of a uniquely associated Katz newform. We also set up multiplicity one results for Katz eigenforms which have reducible Galois representation. [less ▲]

Detailed reference viewed: 90 (3 UL)