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See detailWhen Redistribution Leads to Regressive Taxation
Hariton, Cyril; Piaser, Gwenaël UL

in Journal of Public Economic Theory (2007), 9(4), 589-606

We introduce labor contracts in a framework of optimal redistribution: firms have some local market power and try to discriminate among heterogeneous workers. In this setting we show that if the firms ... [more ▼]

We introduce labor contracts in a framework of optimal redistribution: firms have some local market power and try to discriminate among heterogeneous workers. In this setting we show that if the firms have perfect information, i.e., they perfectly discriminate against workers and take all the surplus, the best tax function is flat. If firms have imperfect information, i.e., if they offer incentive contracts, then (under some assumptions) the best redistributive taxation is regressive. [less ▲]

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See detailWhen RIS Meets GEO Satellite Communications: A New Sustainable Optimization Framework in 6G
Khan, Wali Ullah UL; Lagunas, Eva UL; Mahmood, Asad UL et al

Scientific Conference (2022, June 19)

Reflecting intelligent surfaces (RIS) is a low-cost and energy-efficient solution to achieve high spectral efficiency in sixth-generation (6G) networks. The basic idea of RIS is to smartly reconfigure the ... [more ▼]

Reflecting intelligent surfaces (RIS) is a low-cost and energy-efficient solution to achieve high spectral efficiency in sixth-generation (6G) networks. The basic idea of RIS is to smartly reconfigure the signal propagation by using passive reflecting elements. On the other side, the demand of high throughput geostationary (GEO) satellite communications (SatCom) is rapidly growing to deliver broadband services in inaccessible/insufficient covered areas of terrestrial networks. This paper proposes a GEO SatCom network, where a satellite transmits the signal to a ground mobile terminal using multicarrier communications. To enhance the effective gain, the signal delivery from satellite to the ground mobile terminal is also assisted by RIS which smartly shift the phase of the signal towards ground terminal. We consider that RIS is mounted on a high building and equipped with multiple re-configurable passive elements along with smart controller. We jointly optimize the power allocation and phase shift design to maximize the channel capacity of the system. The joint optimization problem is formulated as nonconvex due to coupled variables which is hard to solve through traditional convex optimization methods. Thus, we propose a new optimal algorithm which is based on Mesh Adaptive Direct Search to obtain an efficient solution. Simulation results unveil the benefits of RIS-assisted SatCom in terms of system channel capacity. [less ▲]

Detailed reference viewed: 56 (16 UL)
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See detailWhen small is left and large is right : Behavioural evidence for attentional shifts due to irrelevant numerical cues
Hoffmann, Danielle UL; Goffaux, Valérie; Schiltz, Christine UL

Poster (2010)

Numerous behavioural studies indicate the existence of a link between numerical representations and visuo-spatial processes (for review see DeHevia et al., 2008). A striking demonstration of this link was ... [more ▼]

Numerous behavioural studies indicate the existence of a link between numerical representations and visuo-spatial processes (for review see DeHevia et al., 2008). A striking demonstration of this link was provided by Fischer and colleagues (2003), who reported that participants detect a target faster in the left hemifield, if preceded by a small number (e.g. 2 or 3) and faster in the right hemifield if preceded by a large number (e.g. 8 or 9). This is strong evidence that numbers orient visuo-spatial attention to the left or right hemifield, depending on their magnitude (e.g., small and large, respectively) (see also Galfano et al., 2006; Ristic et al., 2006). We designed a modified version of this target detection paradigm, by replacing the detection task with a target discrimination task (cf. Hommel et al., 2001). The participants (n=16) were presented 1 task irrelevant digit (1,2 vs. 8,9) for 400ms. After a variable inter-stimulus interval (500, 1000 or 2000ms), they had to discriminate the colour of a brief (100ms) lateral target. We hypothesized that the centrally presented numbers would induce an orientation of attention, in the same direction as the initial observations by Fischer et al. (2003). The current results indicate a significant effect, but only for the shortest digit-target interval (500ms). We observed a significant interaction between number magnitude (small/large) and side of target presentation (left/right) (F1,15 =7.784, p<0.014). These findings indicate that the attentional shifts induced by irrelevant numerical material are independent of the exact nature of target processing (discrimination vs. detection). [less ▲]

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See detailWhen solidarity melts into air: Philippines-born women migrants in Australia
Espinosa, Shirlita Africa UL

Book published by Bloomsbury Academic (in press)

This chapter looks at the (mis)recognition of the symbolic violence engendered by intra-ethnic women's solidarity in the context of international sexual division of labor. In particular I focus on the ... [more ▼]

This chapter looks at the (mis)recognition of the symbolic violence engendered by intra-ethnic women's solidarity in the context of international sexual division of labor. In particular I focus on the publications of Philippines-born women migrant's organisations. The chapter interrogates the violence of documenting the struggle against racialist and elitist marginalisation of migrant women in the context of multicultural Australia. [less ▲]

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See detailWhen Text Authors Lived Using Undated Citations
Mughaz, Dror; HaCohen-Kerner, Yaakov; Gabbay, Dov M. UL

in Lamas, David; Buitelaar, Paul (Eds.) Multidisciplinary Information Retrieval (2014)

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See detailWhen the exception becomes the rule … When the margins become the center …
Schafer, Valerie UL

Scientific Conference (2018, August 23)

This contribution invited participants of the Summer school to critically reflect upon centers and peripheries in Internet history, not only from a geographical perspective , but also from a narrative ... [more ▼]

This contribution invited participants of the Summer school to critically reflect upon centers and peripheries in Internet history, not only from a geographical perspective , but also from a narrative standpoint [less ▲]

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See detailWhen the Foundations of Life have been Upset… An Integrated Clinical and Experimental Study with Refugees and Asylum Seekers
Schiltz, Lony; Schiltz, Jang UL

in Archives of Psychiatry and Psychotherapy (2013), 15(2), 53-62

Aim Recent research results in clinical psychology, health psychology and neurobiology underline the relationship between dissociative states, complex posttraumatic syndromes and borderline functioning ... [more ▼]

Aim Recent research results in clinical psychology, health psychology and neurobiology underline the relationship between dissociative states, complex posttraumatic syndromes and borderline functioning [11]. Our study is meant to investigate the traumatic hypothesis of borderline functioning and to develop appropriate psychotherapeutic measures based on artistic mediations. Material and Methods.To estimate the effect of traumatic events, from the beginning of life up to recent stressors, linked to natural catastrophes, war, political persecution and migration, we undertook an integrated clinical and experimental study with a sample of 73 refugees and asylum seekers. In a second stage, those who suffered from PTSD or complex post-traumatic states were offered to attend arts psychotherapeutic sessions.. To investigate the personality functioning at the structural level, we used a mixed quantitative and qualitative methodology, combining a semi-structured biographical interview, a projective test, i.e. the Sentences Completion Test, for which we developed a new manner of interpretation , and psychometric scales, i.e. the HADS and the Index of Wellbeing . Furthermore, we analysed the artistic production (pictures, stories written under musical induction) with the help of rating scales constructed in the phenomenological and structural tradition. Results. With the help of non parametric multidimensional statistics, we extracted two profiles of personality functioning, linked either to repeated breaks, negligence and maltreatment from the beginning of life, or either to a recent external catastrophe, interrupting a continuous life course. Through the evaluation of the arts therapeutic sessions, we could note the first signs of resumption of the blocked process of subjectivation. Discussion.The results of the study support the traumatogenic hypothesis of borderline functioning, as well as current clinical considerations concerning the defensive role of dissociation in complex posttraumatic states. Conclusion. The study opens tracks for future research concerning an in depth investigation of the arts therapeutic process with traumatized people. [less ▲]

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See detailWhen the Going Gets Tough, Do the Tough Go Shopping?
Pan, Xiaodan; Dresner, Martin; Mantin, Benny UL

in Journal of Business Logistics (in press)

This study examines the impacts of consumer confidence on stockpiling behavior and, subsequently, retail inventory management. We show how stockpiling behavior evolved during the “Great Recession” of 2008 ... [more ▼]

This study examines the impacts of consumer confidence on stockpiling behavior and, subsequently, retail inventory management. We show how stockpiling behavior evolved during the “Great Recession” of 2008-2009 as consumer confidence waned and demonstrate the impact of this development on inventory management. Drawing on the two-segment household inventory theory consisting of non-stockpiling and stockpiling segments, we use a panel dataset (2005-2015) to calibrate household inventory holdings. This dataset then serves as input for a retailer-level case study. Our empirical analysis reveals significant impacts from changing stockpiling behavior. When consumer confidence is low, both stockpiling and non-stockpiling segments respond by reducing weekly consumption rates; however, the stockpiling segment also significantly lengthens the time between shopping trips, and ultimately increases the duration of inventory holdings. These changes to consumption and stockpiling add complexity to inventory planning, requiring retailers to carefully adjust inventory levels to maintain service levels. [less ▲]

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See detailWhen the reality of death strikes: Ways of dealing with existential fears in cancer patients.
Hoffmann, Martine UL; Ferring, Dieter UL

in Psychology and Health (2009), 24(1)

In the present study existential fears and concerns in cancer patients were explored with respect to coping behavior and measures of subjective well-being. Thereby, cancer-related existential fears were ... [more ▼]

In the present study existential fears and concerns in cancer patients were explored with respect to coping behavior and measures of subjective well-being. Thereby, cancer-related existential fears were assessed by means of a newly developed six-item scale. The study sample consisted of 126 patients undergoing ambulant treatment for different types of cancer. Data were collected at the University of Luxembourg, in cooperation with several medical centers and cancer foundations in Luxembourg, Germany and France. Results highlighted the importance of existential fears in cancer patients. Cluster analyses resulted in a two clustersolution, regrouping patients ‘‘high’’ and ‘‘low’’ levels of existential fears. Analyses of variance indicated that the cluster displaying high levels of existential fears showed significantly higher levels of ‘‘rumination’’ than the other cluster, associated with increased levels of ‘‘hopelessness’’ and lower ‘‘self-esteem’’. Results are discussed with respect to intervention programs focusing on the regulation of anxiety in cancer patients. [less ▲]

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See detailWhen the score function is the identity function - A tale of characterizations of the normal distribution
Ley, Christophe UL

in Econometrics and Statistics (2020)

The normal distribution is well-known for several results that it is the only to fulfil. Much less well-known is the fact that many of these characterizations follow from the fact that the derivative of ... [more ▼]

The normal distribution is well-known for several results that it is the only to fulfil. Much less well-known is the fact that many of these characterizations follow from the fact that the derivative of the log-density of the normal distribution is the (negative) identity function. This a priori very simple yet surprising observation allows a deeper understanding of existing characterizations and paves the way for an immediate extension of various seemingly normal-based characterizations to a general density by replacing the (negative) identity function in these results with the derivative of that log-density. [less ▲]

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See detailWhen the “vulnerable” talk back: subjective responses and individual experiences of young refugees
Gilodi, Amalia UL; Richard, Catherine UL

Scientific Conference (2022, June 30)

In the context of international protection and reception, an increasing amount of interest has been given to the assessment of vulnerability among forced migrants in order to provide special provisions ... [more ▼]

In the context of international protection and reception, an increasing amount of interest has been given to the assessment of vulnerability among forced migrants in order to provide special provisions and guarantees to ‘vulnerable refugees’. However, a common definition of vulnerability does not exist. The systematisation of individuals’ experiences in pre-defined bureaucratic categories risks ignoring the contextual and contingent nature of migrants’ vulnerability, the subjective and biographical differences among those considered vulnerable and the agency of each individual facing conditions of vulnerability. Thus, in the context of the H2020 project MIMY, this paper proposes to explore the experiences and feelings of the people living in an apparent condition of vulnerability. Based on in-depth interviews with young adults who obtained refugee status in Luxembourg but still live in ‘temporary’ reception centres, the current study wants to move beyond the bureaucratic vulnerability label, questioning the relationship between structural, contingent and material conditions of vulnerability and the subjective experiences and responses of the active agents who occupy them. Additionally, bringing the stories and perspectives of young refugees living in Luxembourg to the forefront, the study points to the variability of vulnerability at the individual level in the context of integration. We propose to analyse such plurality of stories through the lens of agency and temporality, as the unique product of past personal experiences, current situations of difficulty and conditions of(in)security (based on the interrelationship between obstacles and resources) and individual future perspectives and feelings of self-efficacy. [less ▲]

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See detailWhen Time Breaks: The Hiatus of Refugee Status
Van Der Walt, Johan Willem Gous UL

E-print/Working paper (2018)

“In the first place, we don’t like to be called ‘refugees.’ We ourselves call one another ‘newcomers’ or ‘immigrants.’” Already here, in the first sentence of Arendt’s essay “We Refugees,” does the hiatus ... [more ▼]

“In the first place, we don’t like to be called ‘refugees.’ We ourselves call one another ‘newcomers’ or ‘immigrants.’” Already here, in the first sentence of Arendt’s essay “We Refugees,” does the hiatus of refugee status become manifest. A divide already opens up between different habits of reference. Refugees refer to themselves in one way, non-refugees refer to them in another, and so does the projected or desired possibility of one world in which both refugees and non-refugees might find accommodation, split into two very different realities. Consciousness of the split is of course solely that of the refugees, at first. Initially, the hiatus is theirs only. Others – non-refugees – remain soundly oblivious to this fundamental split until such time as it brutally breaks into their world too, for instance, when the corpse of a four-year old child washes up on a beach, and washes up on every doorstep in a succession of media waves. And then the hiatus is suddenly everywhere and no one remains exempted. As the last sentence of Arendt’s essay contends forcefully, the split begins with the refugee status of some, but it ends with the bigger split of a world that begins to falter and fall apart: “The comity of European peoples went to pieces when, and because, it allowed its weakest member to be excluded and persecuted.” The comity of European peoples show all signs of going to pieces again today. When the comity of peoples goes to pieces, it is not only common space that cracks up, but also common time, the common time that warrants common space according to Kant’s Schematismuslehre. It is ultimately this breaking of time – the hiatus of time – that Arendt thematises elsewhere with reference to “the desolate aimless wanderings of Israeli tribes in the wilderness and the dangers which befell Aeneas before he reached the Italian shore.” “[T]his hiatus,” she continues, obviously creeps into all time speculations which deviate from the currently accepted notion of time as a continuous flow.” (Arendt On Revolution, 205). This text is also a supplementary discussion of my reviews of two recent monographs on Arendt. See: RECENT ARENDT SCHOLARSHIP: Review of The Wandering Thought of Hannah Arendt by Hans Jörg Sigwart, Palgrave MacMillan, 2016, ISBN: 978-1-137-48214-3, 147 pages (abbreviated as WT below), and Rightlessness in an Age of Rights. Hannah Arendt and the Contemporary Struggles of Migrants by Ayten Gündoğdu, New York: Oxford University Press: 2015, 298 pages, forthcoming in Constellations. [less ▲]

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See detailWhen Time Gives. Reflections on Two Rivonia Renegades
Van Der Walt, Johan Willem Gous UL

in Allo, Awol (Ed.) The Court Room as a Space of Resistance. Reflections on the Legacy of the Rivonia Trial (2015)

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See detailWhen Trusting Your Family Hurts Your Family Business
Jaskiewicz, Peter; Carney, Michael G.; Hansen, Christopher UL

Article for general public (2021)

Detailed reference viewed: 103 (6 UL)
See detailWhen We Share More Than Ever
Schulze, Sabine; Ruelfs, Esther; Gruber, Teresa et al

Book published by Museum für Kunst und Gewerbe Hamburg (2015)

6th Triennial of Photography, MK&G Hamburg When we share more than everThe show “When We Share More Than Ever” consists of 246 works. It is the very nature of sharing in the digital age that (most) visual ... [more ▼]

6th Triennial of Photography, MK&G Hamburg When we share more than everThe show “When We Share More Than Ever” consists of 246 works. It is the very nature of sharing in the digital age that (most) visual information is treated horizontally: democratically not in the sense of a philosophical prerogative, but rather a form of free-to-choose availability that is – at least partially – neutrally presented. This form of neutrality is based on a supposed pragmatic objectivity. Just think about Google Image Search. If I can have it at my fingertip, I am the one to make the decision. With the aforementioned in mind, we have created a central-access exhibition layout, which takes as a primary motif the ambition of the inventory. From all that we have heard, been told, seen and experienced, the show and its meta-narrative is dealing with (and producing) different forms and formats of the archival. Even the (forthcoming) blog functions as an archive. Producing a (spatial) inventory of all works (which you will find in this document), we have studied each “sharing”-cluster, investigating size against content and vice versa. The central driving force of our investigation is considering the huge number of works on show, the archival nature of the collection, and the meta-context of the Triennial as a form of Future Archive. Hence, our proposal for the show is dealing with the inherent relationship between art and trade, which – especially at the Museum für Kunst & Gewerbe – has, historically, been a major focal point. The exhibition design interrogates the role, function, and contextualization of an individual work within a cluster and the show at large. Moreover, it interrogates the relationship between different works as well as the role and position of the artist(s). In an exhibition format that attempts to unite 13 institutions (+ 38 satellite shows) within a content framework dealing with a specific form of production and output, photography and film, this underlying narrative of the archival becomes even more relevant. The exhibition design works around a single concept of hanging, which is horizontally organized around a 1,2m baseline. This form of organization produces a fixed horizontal datum. It further means that each work has to negotiate as well as that is has to be negotiated – it produces an archival show in its purest form. All physical elements and objects to be built react to the very same datum and are cut off vertically at the horizontal datum. This form of vertical and horizontal display allows for a no-nonsense inventory that formulates a framework for a virtual-era Neue Sachlichkeit. As part of our design, we would like to propose to go even a step further and remove any physically present information about artist(s) and work(s). Each individual work on the wall (or in space) would simply be allocated with a number, underlining the intrinsic relationship between spatial installation and the printed matter guide, which will act as a deciphering manual for the entire exhibition. The setting up of such scaffold and borderlines is crucial as each individual member of the audience to the project needs to take a position. Taking a position always has consequences. Only when a border is acknowledged, understood and recognised it can be broken, transgressed or (mis)used. By deliberately producing such agonistic field of (productive) encounters, the design aims to nurture and exploit notions of misunderstanding(s) and a pro-active outlook on the value of failure as the starting point of all forms of experiment. We understand the design of the show to act both as an act of enabling (facilitating consensus), as well as an act of disabling (exploiting dissensus). Invited Artists: Laia Abril, Ai Weiwei, Regula Bochsler, Natalie Bookchin, Heman Chong, Aurélien Froment, David Horvitz, Trevor Paglen, Doug Rickard, Taryn Simon, Jens Sundheim, Penelope Umbrico. From the Photography and New Media Collection of the MKG: Fratelli Alinari, Hanns-Jörg Anders, Nobuyoshi Araki, Francis Bedford, Félix Bonfils, Adolphe Braun, Natascha A. Brunswick, Atelier d’Ora-Benda, Minya Diez-Dührkoop, Rudolf Dührkoop, Harold E. Edgerton, Tsuneo Enari, Andreas Feininger, Johann Hamann, Theodor und Oscar Hofmeister, Thomas Höpker, Lotte Jacobi, Gertrude Käsebier, Kaku Kurita, Atelier Manassé, Hansi Müller-Schorp, Eadweard Muybridge, Arnold Newman, Terry Richardson, Max Scheler, Hildi Schmidt-Heins, Hiromi Tsuchida, Carl Strüwe, Léon Vidal, and more. [less ▲]

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See detailWhen will smart antennas be ready for the market? Part I
Kaiser, T.; Bourdoux, A.; Choi, S. et al

in EURASIP Journal on Wireless Communications and Networking (2005), 22(2), 87-92

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See detailWhen will smart antennas be ready for the market? Part II - results
Kaiser, T.; Bourdoux, A.; Choi, S. et al

in IEEE Signal Processing Magazine (2005), 22(6), 174176

Detailed reference viewed: 34 (0 UL)