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See detailDiscrete-Event Simulation and Integer Linear Programming for Constraint-Aware Resource Scheduling
Shin, Seung Yeob UL; Brun, Yuriy; Balasubramanian, Hari et al

in IEEE Transactions on Systems, Man, and Cybernetics (2017)

This paper presents a method for scheduling resources in complex systems that integrate humans with diverse hardware and software components, and for studying the impact of resource schedules on system ... [more ▼]

This paper presents a method for scheduling resources in complex systems that integrate humans with diverse hardware and software components, and for studying the impact of resource schedules on system characteristics. The method uses discrete-event simulation and integer linear programming, and relies on detailed models of the system’s processes, specifications of the capabilities of the system’s resources, and constraints on the operations of the system and its resources. As a case study, we examine processes involved in the operation of a hospital emergency department, studying the impact staffing policies have on such key quality measures as patient length of stay (LoS), number of handoffs, staff utilization levels, and cost. Our results suggest that physician and nurse utilization levels for clinical tasks of 70% result in a good balance between LoS and cost. Allowing shift lengths to vary and shifts to overlap increases scheduling flexibility. Clinical experts provided face validation of our results. Our approach improves on the state of the art by enabling using detailed resource and constraint specifications effectively to support analysis and decision making about complex processes in domains that currently rely largely on trial and error and other ad hoc methods. [less ▲]

Detailed reference viewed: 167 (38 UL)
See detailDiscrete-Phase Sequence Design for Coexistence of MIMO Radar and MIMO Communications
Alaee-Kerahroodi, Mohammad UL; Mishra, Kumar Vijay; Shankar, M. R. Bhavani et al

in 2019 IEEE 20th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) (2019)

Detailed reference viewed: 88 (5 UL)
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See detailDiscrete-Phase Sequence Design with Stopband and PSL Constraints for Cognitive Radar
Alaeekerahroodi, Mohammad UL; Kumar, Sumit UL; Mysore Rama Rao, Bhavani Shankar UL et al

in Proceedings of EuRAD 2020 (in press)

We present the design of discrete-phase sequences considering simultaneously the peak sidelobe level (PSL) and avoiding reserved frequency bands which are occupied by narrowband interferers or ... [more ▼]

We present the design of discrete-phase sequences considering simultaneously the peak sidelobe level (PSL) and avoiding reserved frequency bands which are occupied by narrowband interferers or communications. We use the coordinate descent framework and propose an algorithm to design discrete-phase sequences with spectral power suppressed in arbitrary bands and with low auto-correlation sidelobes in terms of PSL. Our proposed algorithm exploits fast Fourier transform and is, therefore, computationally efficient. The over-the-air experiments using implementation on software-defined radio show reasonable agreement with numerical simulations and feasibility for field-deployment [less ▲]

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See detailA discrete/continuous numerical approach to multi-physics
Peters, Bernhard UL; Besseron, Xavier UL; Estupinan Donoso, Alvaro Antonio UL et al

in IFAC-PapersOnLine (2015), 28(1), 645-650

A variety of technical applications are not only the physics of a single domain, but include several physical phenomena, and therefore are referred to as multi-physics. As long as the phenomena being ... [more ▼]

A variety of technical applications are not only the physics of a single domain, but include several physical phenomena, and therefore are referred to as multi-physics. As long as the phenomena being taken into account is either continuous or discrete i.e. Euler or Lagrangian a homogeneous solution concept can be employed. However, numerous challenges in engineering include continuous and discrete phase simultaneously, and therefore cannot be solved only by continuous or discrete approaches. Problems include both a continuous and a discrete phase are important in applications of the pharmaceutical Industry e.g. drug production, agriculture and food processing industry, mining, construction and Agricultural machinery, metal production, power generation and systems biology. The Extended Discrete Element Method (XDEM) is a novel technique, which provides a significant advance for the coupled discrete and continuous numerical simulation concepts. It expands the dynamics of particles as described by the classical discrete element method (DEM) by a thermodynamic state or stress/strain coupled as fluid flow or structures for each particle in a continuum phase. XDEM additionally estimates properties such as the interior temperature and/or species distribution. These predictive capabilities are extended to fluid flow through an interaction by heat, mass and momentum transfer important for process engineering. © 2015, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved. [less ▲]

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See detailDiscretion, Care and Public Interests in the EU Administration: Probing the Limits of Law
Mendes, Joana UL

in Common Market Law Review (2016), 53(2), 419-452

Recent high profile judgments of the European Court of Justice (ESMA and Gauweiler) have endorsed the expansion of the EU’s executive powers, including those of its administration. Once such powers are ... [more ▼]

Recent high profile judgments of the European Court of Justice (ESMA and Gauweiler) have endorsed the expansion of the EU’s executive powers, including those of its administration. Once such powers are attributed or judicially endorsed, how far may law reach in structuring the exercise of discretion by EU administrative actors? The article analyses the way the EU courts have reviewed administrative discretion in instances where they have performed a close scrutiny thereof. It argues that the EU courts downplayed the role law ought to have in structuring the exercise of administrative discretion, by overlooking the public interests that ought to be pursued by force of legal norms. By contrast, the control of discretion by the European Ombudsman illustrates a different and normatively more demanding understanding of how law may operate in relation to discretion. [less ▲]

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See detailDiscretionary power, scientific uncertainty and right to life in the context of the Covid-19 pandemic: Lessons learnt from the Administrative Tribunal of Guadeloupe and the French Council of State
Donati, Alessandra UL

in European Journal of Risk Regulation (2020)

Administrative Tribunal of Guadeloupe 28 March 2020, case n° 2000295 (Judge for interim relief); French Council of State 4 April 2020, cases n° 439904, 439905 (Judge for interim relief) Based on the ... [more ▼]

Administrative Tribunal of Guadeloupe 28 March 2020, case n° 2000295 (Judge for interim relief); French Council of State 4 April 2020, cases n° 439904, 439905 (Judge for interim relief) Based on the precautionary principle and to protect the right to life under Article L. 521-2 of the French Code of Administrative Justice, the Administrative Tribunal of Guadeloupe (Judge for interim relief) ordered the Regional Health Agency of Guadeloupe and the University Hospital Centre of Guadeloupe to procure 200,000 COVID-19 screening tests corresponding to half of the population of Guadeloupe and to buy the doses necessary for the treatment of the COVID-19 epidemic with hydroxychloroquine and azithromycin for 20,000 patients. On appeal, the French Council of State, by disregarding the application of the precautionary principle and with controversial reasoning concerning the relationship between discretionary power and scientific uncertainty, annulled the decision of the Administrative Tribunal of Guadeloupe. [less ▲]

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See detailDiscretisation and Model Selection for Interface Problems in Mechanics
Bordas, Stéphane UL

in International Journal of Computational Methods (2017, August 04)

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See detailDiscretisation, Multiscale Fracture Mechanics Problems, Cutting & Surgical Simulation: extended finite element method, meshfree methods and isogeometric analysis
Bordas, Stéphane UL

Speeches/Talks (2014)

MATERIALS & SURFACE SCIENCE INSTITUTE PRESENTATION BY Professor Stéphane P. A. Bordas University of Luxembourg and Cardiff University PRESENTATION TITLE Cutting in Real-time in Co-rotational Elasticity ... [more ▼]

MATERIALS & SURFACE SCIENCE INSTITUTE PRESENTATION BY Professor Stéphane P. A. Bordas University of Luxembourg and Cardiff University PRESENTATION TITLE Cutting in Real-time in Co-rotational Elasticity and Perspectives on Simulating Cuts ABSTRACT We focus on the simulation of surgical acts of types similar to cutting and needle insertion in soft tissue, in real time (500Hz), where the scale of the surgical instrument is several orders of magnitude smaller than that of the organ. We provide review of the state of the art and make propositions to address some of the main difficulties in this area: complex geometries - implicit boundaries, XFEM, meshless, advanced meshing; multiple scales (large gradients) - domain decomposition and model reduction; error control and adaptivity; parallel implementation Graphical Processing Units (GPUs). We then describe a series of contributions in the field of real-time simulation of soft tissue biomechanics. These contributions address various requirements for interactive simulation of complex surgical procedures. In particular, we present results in the areas of soft tissue deformation, contact modelling, simulation of cutting, and haptic rendering, which are all relevant to a variety of medical interventions. The contributions we describe share a common underlying model of deformation and rely on GPU implementations to significantly reduce computational expense. Since the commencement of the ERC RealTcut Starting Research Grant, we have made a number of advances, in particular in the area of real-time simulation of cutting. We have started implementing a novel cutting algorithm and investigating co-rotational elasticity to non-linear materials. We have shown that it is possible to cut non-linear solids formulated within a co-rotational formalism in real-time with a tetrahedron subdivision method and a Sherman-Morrison update. The next steps include assessing the error associated with the single Newton iteration, extending to non-linear materials, and investigating the improvements enabled by enriched approximations. These results will form the basis of the real-time work. ABOUT THE PRESENTER In 1999, Stéphane Bordas joined a joint graduate programme of the French Institute of Technology (Ecole Spéciale des Travaux Publics) and the American Northwestern University. In 2003, he graduated in Theoretical and Applied Mechanics with a PhD from Northwestern University. Between 2003 and 2006, he was at the Laboratory of Structural and Continuum Mechanics at the Swiss Federal Institute of Technology in Lausanne, Switzerland. In 2006, he became permanent lecturer at Glasgow University’s Civil Engineering Department. Stéphane joined the Computational Mechanics team at Cardiff University in September 2009, as a Professor in Computational Mechanics and directed the institute of Mechanics and Advanced Materials from October 2010 to November 2013. He is the Editor of the book series “Advances in Applied Mechanics” since July 2013. In November 2013, he joined the University of Luxembourg as a Professor in Computational Mechanics. The main axes of his research team include (1) free boundary problems and problems involving complex geometries, in particular moving boundaries and (2) ‘a posteriori’ discretisation and model error control, rationalisation of the computational expense. Stéphane’s keen interest is to actively participate in innovation, technological transfer as well as software tool generation. This has been done through a number of joint ventures with various industrial partners (Bosch GmbH, Cenaero, inuTech GmbH, Siemens-LMS, Soitec SA) and the release of open-source software. He has been collaborating with over 110 academic partners over the last 10 years. In 2012, Stéphane was awarded an ERC Starting Independent Research Grant (RealTcut), to address the need for surgical simulators with a computational mechanics angle with a focus on the multi-scale simulation of cutting of heterogeneous materials in real-time. DATE: Monday, 10 February 2014 TIME: 15h30 VENUE: MSB-012 MSSI Building REFRESHMENTS WILL BE PROVIDED AT 15h15 For further information, please contact: Professor Michael McCarthy, Tel. No: (061) 202222 or Email: michael.mccarthy@ul.ie [less ▲]

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See detailDiscrezionalità dell'azione disciplinare e limiti esterni all'esercizio del potere
Ratti, Luca UL

in Mainardi, S. (Ed.) Nuova giurisprudenza sistematica civile e commerciale (2012)

Detailed reference viewed: 70 (0 UL)
See detailLa discrimination des femmes au travail: le cas de la Commission européenne
Weis, Christiane UL

Bachelor/master dissertation (2001)

Detailed reference viewed: 94 (6 UL)
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See detailDiscrimination of Angle-Doppler Signatures using Arbitrary Phase Center Motion for MIMO Radars
Hammes, Christian UL; Nijsure, Yogesh UL; Shankar, Bhavani UL et al

in IEEE Radar Conf 2017 (2017, May)

A novel Phase Center Motion (PCM) based technique for discriminating angle-Doppler signatures within Multiple-Input-Multiple-Output (MIMO) radars using Frequency Modulated Continuous Wave (FMCW) has been ... [more ▼]

A novel Phase Center Motion (PCM) based technique for discriminating angle-Doppler signatures within Multiple-Input-Multiple-Output (MIMO) radars using Frequency Modulated Continuous Wave (FMCW) has been explored in this work. The PCM technique induces angle dependent Doppler shifts in the back-scattered signal, wherein a modified Doppler post processing for FMCW leads to joint angle-Doppler processing. Specifically, we intend to design unique spatialtemporal motion of the phase center on each individual MIMO radar channel in an effort to synthesize nearly orthogonal angle-Doppler signatures. Subsequently, we also develop a MIMO radar receiver design, which would be capable of discriminating between these induced angle-Doppler signatures. The asymptotic investigation provides a Bessel function characteristic. Simulation results demonstrate a significant side-lobe suppression of 8:5 dB for an individual PCM trajectory and 7 dB over distinct PCM trajectories, in an attempt towards realization of nearly orthogonal MIMO radar channels. [less ▲]

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See detailDiscrimination of Numerosities in children studied by means of Fast Periodic Visual Stimulation
Mejias, Sandrine; Rossion, Bruno; Schiltz, Christine UL

Poster (2014)

We are constantly dealing with quantities in our environment. This ability to process numerical magnitude is present in infants (Izard et al., 2009), a variety of animal species (Flombaum et al., 2005 ... [more ▼]

We are constantly dealing with quantities in our environment. This ability to process numerical magnitude is present in infants (Izard et al., 2009), a variety of animal species (Flombaum et al., 2005) and in tribes with small number words lexicon (Pica et al., 2004). It implies that our brain is able to extract the total number of items in a scene, regardless of perceptual interference (non-numerical properties of the stimuli). However, this ability seems to be refined through development (Halberda et al., 2012), due to visual-perception maturation and/or educational environment, e.g. when learning arithmetic. Here, we measured rapidly and objectively 6-to-12-y.o. children’s sensitivity to (non-)symbolic numerical stimuli (dots or Arabic numbers), using fast periodic visual stimulation (FVPS) as implemented in a repetition-suppression paradigm (Rossion & Boremanse, 2011). Children were presented with stimuli appearing at 3.5 items/second (fundamental frequency=3.5 Hz), for 60 seconds. Half of the sequences consisted of different stimuli at every cycle of stimulation (e.g., “10”, “18”, “12”,...), the other half of sequences were composed of same stimuli (“10”) repeated throughout the whole sequence. We observed a large increase of the EEG response at the fundamental frequency (a steady-state visual evoked potential; Regan, 1966) over the lateral parieto-occipital electrodes sites. This response was reduced when the same stimulus was repeated, especially for symbolic stimuli. These results are correlated to children’s age and visual-perception, arithmetic and non-symbolic numerical abilities (L-POST, KRT, Panamath). They indicate that FPVS of (non-)symbolic numerosities is a promising tool to study children’s sensitivity to numerical magnitude. [less ▲]

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See detailDiscrimination of thermal baths by single-qubit probes
Gianani, Ilaria; Farina, Donato; Barbieri, Marco et al

in Physical Review Research (2020)

Nonequilibrium states of quantum systems in contact with thermal baths help distinguishing between environments with different temperatures or different statistics. We extend these studies to a more ... [more ▼]

Nonequilibrium states of quantum systems in contact with thermal baths help distinguishing between environments with different temperatures or different statistics. We extend these studies to a more generic problem that consists in discriminating between two baths with disparate constituents at unequal temperatures. Notably there exist temperature regimes in which the presence of coherence in the initial state preparation is beneficial for the discrimination capability. We also find that nonequilibrium states are not universally optimal and detail the conditions in which it becomes advantageous to wait for complete thermalization of the probe. These concepts are illustrated in a linear-optical simulation. [less ▲]

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See detailDiscriminative power of different nonmotor signs in early Parkinson's disease. A case-control study
Diederich, Nico UL; Pieri, Vannina; Hipp, Geraldine et al

in Movement Disorders (2010), 25(7), 882-887

The objective of this study was to evaluate the discriminative power of different nonmotor signs for early diagnosis of Parkinson's disease (PD). Thirty patients with PD with <or=3 years of disease ... [more ▼]

The objective of this study was to evaluate the discriminative power of different nonmotor signs for early diagnosis of Parkinson's disease (PD). Thirty patients with PD with <or=3 years of disease duration were compared with 30 healthy controls. Six deficit domains (DD) were defined: hyposmia, sleep abnormalities, dysautonomia, visual deficits, executive dysfunction, and depression. Plotting of Receiver operating characteristic (ROC) curves and exact conditional logistic modeling, followed by manual stepwise descending procedure were used to identify a model for nonmotor signs that detects early PD. Patients with PD and controls did not differ in terms of age, gender, and educational level. Several DD discriminated patients with PD from healthy controls. Visual deficits showed the largest area under the ROC curve (0.83), followed by hyposmia (0.81) and dysautonomia (0.80). When combining the DD visual deficits and dysautonomia, the best residual model was obtained; it maximized both sensitivity and specificity for PD at a level of 0.77. At an early disease stage, several nonmotor domains were already able to discriminate patients with PD from healthy controls. Visual deficits had the best discriminatory power. Being brief and inexpensive, visual tests should be further investigated in larger cohorts as potential screening tool for early PD. [less ▲]

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See detailDiscursive Input/Output Logic: Deontic Modals, and Computation
Farjami, Ali UL

Doctoral thesis (2020)

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See detailThe discursive uses of the Bologna Process in Romanian Higher Education reform
Deca, Ligia UL

Scientific Conference (2013, June 20)

Since its inception in Sorbonne (2008), the Bologna Process or part of its action lines have been ‘framed’ in different ways in national contexts by various actors, in order to legitimize the change in ... [more ▼]

Since its inception in Sorbonne (2008), the Bologna Process or part of its action lines have been ‘framed’ in different ways in national contexts by various actors, in order to legitimize the change in higher education brought about with the pretext of the adherence to this voluntary intergovernmental initiative. The present paper seeks to contribute to better understanding the way in which the Bologna Process appears in the Romanian public discourse of various actors, across more than a decade since the first European Higher Education Area ministerial meeting (1999). Attention will be paid to when, why and by whom the Bologna Process and other international influences were used in the Romanian public discourse. The conclusions of the paper will analyse the level of discursive Europeanisation in Romanian higher education between 1999-2012, problematising the manner in which the ‘external constraint’ represented by the process is used (or opposed) as a strategic resource in the domestic arena. [less ▲]

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See detailDiscursos de oprimidas. Análisis de los discursos de trabajadoras del hogar peruanas en Lima
Mick, Carola UL

in Papeles de Poblacion (2010), 16(63), 187-218

Discourses by the oppressed: critical analysis of the discourses of Peruvian maids in Lima This article is based on 32 interviews, in the capital of Peru, Lima, with domestic workers (all women) who ... [more ▼]

Discourses by the oppressed: critical analysis of the discourses of Peruvian maids in Lima This article is based on 32 interviews, in the capital of Peru, Lima, with domestic workers (all women) who migrated from other regions of the country. It analyzes their migration experiences taking into account their current situation, social and professional, as a social problem with a semiotic aspect. It investigates the language-power relationship from a critical discourse-analytical bottom up-perspective, focusing on how domestic workers construct their identity and social reality, relating to basic ideological structures which defi ne them as ‘oppressed’, and choosing different strategies in view of them. With a combination of the methods of conversation and discourse analysis while focusing on membership categorization processes, it shows how domestic workers transform ideologies in this process, contributing to social change and thus exercising infl uence and power in discourse. [less ▲]

Detailed reference viewed: 134 (0 UL)