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See detailOn signature-based expressions of system reliability
Marichal, Jean-Luc UL; Mathonet, Pierre UL; Waldhauser, Tamás UL

in Journal of Multivariate Analysis (2011), 102(10), 1410-1416

The concept of signature was introduced by Samaniego for systems whose components have i.i.d. lifetimes. This concept proved to be useful in the analysis of theoretical behaviors of systems. In particular ... [more ▼]

The concept of signature was introduced by Samaniego for systems whose components have i.i.d. lifetimes. This concept proved to be useful in the analysis of theoretical behaviors of systems. In particular, it provides an interesting signature-based representation of the system reliability in terms of reliabilities of k-out-of-n systems. In the non-i.i.d. case, we show that, at any time, this representation still holds true for every coherent system if and only if the component states are exchangeable. We also discuss conditions for obtaining an alternative representation of the system reliability in which the signature is replaced by its non-i.i.d. extension. Finally, we discuss conditions for the system reliability to have both representations. [less ▲]

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See detailReview of The Promise of the Nation: Gender, History and Nationalism in Contemporary Ilocano Literature
Espinosa, Shirlita Africa UL

in Intersections: Gender and Sexuality in the Asia Pacific (2011), 27

This review looks into the Roderick Galam's articulations on gender, history and regional literature in the Philippines. I provided my own critique of Galam's interpretations of Ilocano literature and ... [more ▼]

This review looks into the Roderick Galam's articulations on gender, history and regional literature in the Philippines. I provided my own critique of Galam's interpretations of Ilocano literature and nationalist feminism. [less ▲]

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See detailExecutive functions in low-income multilingual children
Engel de Abreu, Pascale UL

Presentation (2011, November)

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See detailRobust Adaptive Controller and Observer Design for a Class of Nonlinear Systems with Unknown Backlash- Like Hysteresis
Jasim, Ibrahim UL

in 2011 IEEE International Conference on Control System, Computing and Engineering (2011, November)

This paper presents a controller and observer design for a class of nonlinear systems that have: i. the coupling of the unmeasured states and unknown parameters ii. unknown Backlash- Like Hysteresis (BLH ... [more ▼]

This paper presents a controller and observer design for a class of nonlinear systems that have: i. the coupling of the unmeasured states and unknown parameters ii. unknown Backlash- Like Hysteresis (BLH) at its actuation. Firstly, we use a developed mathematical model of the BLH in which the BLH is cast into two terms; a linear term and a bound. Then a robust adaptive control law, unmeasured states observer, and unknown parameters estimator are designed such that global stability is achieved for all signals involved. Using the suggested scheme, simulation is carried out for a single- link mechanical system with a BLH exist at its actuation and dynamic friction torque exerts on the joint. Excellent tracking performance is obtained through the suggested approach and all closed loop signals are bounded. [less ▲]

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See detailDevelopment of a method for ex-post identification of falsifications in survey data
Kemper, Christoph UL; Menold, N.; Storfinger, N. et al

Scientific Conference (2011, November)

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See detailReading between the lines: A transnational history of the Franco-British 'entente cordiale' in postwar television
Fickers, Andreas UL; O'Dwyer, Andy

in Journal of European Television History and Culture (2011), 1(2),

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See detailToolkit lemma: Superdiversity
Jørgensen, J. Normann; Juffermans, Kasper UL

Diverse speeches and writings (2011)

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See detailHydrologische Effekte in der terrestrischen Gravimetrie
Weigelt, Matthias UL

Presentation (2011, November)

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See detailRobust Control Design for Spacecraft Attitude Systems with Unknown Dead Zone
Jasim, Ibrahim UL; Jasim, Najah

in 2011 IEEE International Conference on Control System, Computing and Engineering (2011, November)

In this paper, we consider the challenge of controlling inherently complicated nonlinear systems accompanied by input's hard nonlinearities characterized by unknown parameters. This challenge is addressed ... [more ▼]

In this paper, we consider the challenge of controlling inherently complicated nonlinear systems accompanied by input's hard nonlinearities characterized by unknown parameters. This challenge is addressed in this paper by considering the problem of controlling the attitude of a spacecraft when unknown dead zones exist at the actuators. The spacecraft's dynamics is described by the exact form of Euler's equations of motion, allowing for the case of large angle of rotations to be considered. We propose a control scheme that ensures the spacecraft's attitude to track time-varying maneuvers with an exponential tracking error convergence and robustness to actuator dead zones uncertainties. Numerical simulation results along with the theoretical proof show that the proposed control scheme can successfully stabilize the attitude of the spacecraft and achieve the desired tracking performance. [less ▲]

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See detailA mixed integer linear programming approach to pursuit evasion problems with optional connectivity constraints
Thunberg, Johan UL; Ögren, P.

in Autonomous Robots (2011), 31(4), 333-343

In this paper, we address the multi pursuer version of the pursuit evasion problem in polygonal environments. By discretizing the problem, and applying a Mixed Integer Linear Programming (MILP) framework ... [more ▼]

In this paper, we address the multi pursuer version of the pursuit evasion problem in polygonal environments. By discretizing the problem, and applying a Mixed Integer Linear Programming (MILP) framework, we are able to address problems requiring so-called recontamination and also impose additional constraints, such as connectivity between the pursuers. The proposed MILP formulation is less conservative than solutions based on graph discretizations of the environment, but still somewhat more conservative than the original underlying problem. It is well known that MILPs, as well as multi pursuer pursuit evasion problems, are NP-hard. Therefore we apply an iterative Receding Horizon Control (RHC) scheme where a number of smaller MILPs are solved over shorter planning horizons. The proposed approach is implemented in Matlab/Cplex and illustrated by a number of solved examples. [less ▲]

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See detailMobilizing Sustainability, Fixing Competitiveness: An examination of policy mobility Lux-embourg
Carr, Constance UL; Krueger, Robert; Hesse, Markus UL et al

Presentation (2011, November)

The movement of policies across space, often referred to as policy mobility, has been a vibrant area of discussion in the geographical literature in recent years (c.f. McCann 2011; González 2010; Larner ... [more ▼]

The movement of policies across space, often referred to as policy mobility, has been a vibrant area of discussion in the geographical literature in recent years (c.f. McCann 2011; González 2010; Larner and Laurie 2010; Peck and Theodore 2010; Ward 2006; Peck 2002). In particular, scholars have brought forth geographical concepts of relationality and territoriality, along with post-structural accounts of the social construction of knowledge and power, to provide sophisticated and complex accounts of the spatial flows of urban policies and their contingent ‘local’ expressions. In the tradition of urban geography and analysis, mobility stories tend to come from paradigmatic cases, such as Barcelona, Vancouver, New York and others. This paper brings to this conversation a policy mobility story from the rather specific, non-paradigmatic case of Luxembourg. In recent years Luxembourg’s welfare state has developed spatial development policies embedded in the rhetoric and practice of sustainability in an attempt to counteract the contradictions of the State’s rapid development. Much of this policy account emerged from the transfer of ideas and practices from neighboring countries and the European Union. While certainly similar to other new economy spaces in terms of tensions, Luxembourg’s unique system of governance and social and cultural context may yield new insights into the policy mobility literature. The paper thus seeks to contribute to the policy mobility literature by bringing into the fold a case study from a somewhat unique urban context, Luxembourg, concerning the under-explored area of policy mobility domain, urban sustainable development. We hypothesize that Luxembourg’s specific urban policy context could reveal limitations of current approaches. Further, by focusing on sustainability as a policy ‘fix’ for spatial planning, we expect to capture additional nuance of the politics of capital accumulation in a highly fragmented, increasingly relational urban and regional setting. [less ▲]

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See detailToolkit lemma: Languaging
Jørgensen, J. Normann; Juffermans, Kasper UL

Diverse speeches and writings (2011)

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See detailSwitched adaptive quantiser for speech compression based on optimal companding and correlation
Despotovic, Vladimir UL; Peric, Zoran; Velimirovic, Lazar et al

in IET Signal Processing (2011), 5(7), 701-707

This study describes a novel adaptive quantiser based on the optimal companding technique. Adaptation is achieved by adjusting the input of the fixed or non-adaptive quantiser according to the estimated ... [more ▼]

This study describes a novel adaptive quantiser based on the optimal companding technique. Adaptation is achieved by adjusting the input of the fixed or non-adaptive quantiser according to the estimated and quantised gain on each particular frame. In such a way better quantiser adaptation to the varying input statistics is provided. Selection of the appropriate bit rate is performed depending on the value of the correlation coefficient ρ on each frame. The decision thresholds for ρ are determined under the condition that the signal to quantisation noise ratio does not drop under 34.3ρdB, satisfying the G.712 standard quality of speech, while decreasing the bit rate. The information about the gain and about the chosen bit rate is then transferred as a side information to a decoder. Although this slightly increases the side information, the overall savings in the bit rate have shown to be substantial. Theoretical and experimental results are provided, which point out the benefits that can be achieved using the proposed algorithm. [less ▲]

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See detail‘Do you want me to translate this in English or in a better Mandinka language?’: Unequal literacy regimes and grassroots spelling practices in peri-urban Gambia
Juffermans, Kasper UL

in International Journal of Educational Development (2011), 31(6), 643-653

This paper presents a comparative ethnographic analysis of two versions of a grassroots text in Mandinka language, one written by a non-formally educated man, the other a respelling by a formally educated ... [more ▼]

This paper presents a comparative ethnographic analysis of two versions of a grassroots text in Mandinka language, one written by a non-formally educated man, the other a respelling by a formally educated urbanite. The analysis points at a crucial difference in spelling practices and inequality in literacy regimes, i.e., between established orthographic English literacy and the more creative, heterographic and emergent local language literacy. It is shown how English orthography affects local ideologies of literacy as well as Mandinka spelling practices itself, in greater or lesser extent, depending on the educational history of the speller. [less ▲]

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See detailGeodasie und Hydrologie - gemeinsam zum erfolgreichen Resourcenmanagement
Weigelt, Matthias UL

Presentation (2011, November)

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See detailStereo estimation of depth along virtual cut planes
Goncalves Almeida Antunes, Michel UL; Barreto, João Pedro

in International Conference on Computer Vision (ICCV) Workshop on Computer Vision in Vehicle Technology: From Earth to Mars (2011, November)

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See detailSemidefinite Relaxations of Robust Binary Least Squares under Ellipsoidal Uncertainty Sets
Tsakonas, Efthymios; Jaldén, Joakim; Ottersten, Björn UL

in IEEE Transactions on Signal Processing (2011), 59(11), 5169-5180

The problem of finding the least squares solution s to a system of equations Hs = y is considered, when s is a vector of binary variables and the coefficient matrix H is unknown but of bounded uncertainty ... [more ▼]

The problem of finding the least squares solution s to a system of equations Hs = y is considered, when s is a vector of binary variables and the coefficient matrix H is unknown but of bounded uncertainty. Similar to previous approaches to robust binary least squares, we explore the potential of a min-max design with the aim to provide solutions that are less sensitive to the uncertainty in H. We concentrate on the important case of ellipsoidal uncertainty, i.e., the matrix H is assumed to be a deterministic unknown quantity which lies in a given uncertainty ellipsoid. The resulting problem is NP-hard, yet amenable to convex approximation techniques: Starting from a convenient reformulation of the original problem, we propose an approximation algorithm based on semidefinite relaxation that explicitly accounts for the ellipsoidal uncertainty in the coefficient matrix. Next, we show that it is possible to construct a tighter relaxation by suitably changing the description of the feasible region of the problem, and formulate an approximation algorithm that performs better in practice. Interestingly, both relaxations are derived as Lagrange bidual problems corresponding to the two equivalent problem reformulations. The strength of the proposed tightened relaxation is demonstrated by pertinent simulations. [less ▲]

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See detailChineseness as a moving target: Intermediate report for the HERA Project, Tilburg Case Study
Li, Jinling; Juffermans, Kasper UL; Kroon, Sjaak et al

E-print/Working paper (2011)

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