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See detailOscillator Models and Collective Motion: Splay State Stabilization of Self-Propelled Particles
Paley, Derek; Leonard, Naomi; Sepulchre, Rodolphe ULg

in Proceedings of the 44th IEEE Conference on Decision and Control and European Control Conference (2005)

This paper presents a Lyapunov design for the stabilization of collective motion in a planar kinematic model of N particles moving at constant speed. We derive a control law that achieves asymptotic ... [more ▼]

This paper presents a Lyapunov design for the stabilization of collective motion in a planar kinematic model of N particles moving at constant speed. We derive a control law that achieves asymptotic stability of the splay state formation, characterized by uniform rotation of N evenly spaced particles on a circle. In designing the control law, the particle headings are treated as a system of coupled phase oscillators. The coupling function which exponentially stabilizes the splay state of particle phases is combined with a decentralized beacon control law that stabilizes circular motion of the particles in the splay state formation around the center of mass of the group. [less ▲]

Detailed reference viewed: 16 (1 ULg)
See detailOscillator strength for K-like iron, cobalt and nickel
Quinet, Pascal ULg; Hansen, J E

in Proceedings of the 5th International Colloquium on Atomic Spectra and Oscillator Strengths for Astrophysical and Laboratory Plasmas (1996)

Detailed reference viewed: 14 (0 ULg)
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See detailOscillator strengths for Ca-like iron, cobalt and nickel (Fe VII, Co VIII, Ni IX)
Quinet, Pascal ULg; Hansen, J E

in Journal of Physics : B Atomic Molecular & Optical Physics (1996), 29

Detailed reference viewed: 11 (0 ULg)
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See detailOscillator strengths for lines of astrophysical interest in Rh II
Quinet, Pascal ULg; Biémont, E; Palmeri, P et al

in Astronomy and Astrophysics (2012), 537

Detailed reference viewed: 3 (0 ULg)
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See detailOscillator strengths for the gallium-like ions Br V - In XIX
Biémont, E; Quinet, Pascal ULg

in Atomic Spectra and Oscillator Strengths for Astrophysics and Fusion Research (1990)

Detailed reference viewed: 13 (0 ULg)
See detailOscillator strengths for transitions in Pd II
Quinet, Pascal ULg

in Proceedings of the 5th International Colloquium on Atomic Spectra and Oscillator Strengths for Astrophysical and Laboratory Plasmas (1996)

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See detailOscillatority of Nonlinear Systems with Static Feedback
Efimov, Denis ULg; Fradkov, Alexander

in SIAM Journal on Control & Optimization (2009), 48(2), 618-640

New Lyapunov-like conditions for oscillatority of dynamical systems in the sense of Yakubovich are proposed. Unlike previous results these conditions are applicable to nonlinear systems and allow for ... [more ▼]

New Lyapunov-like conditions for oscillatority of dynamical systems in the sense of Yakubovich are proposed. Unlike previous results these conditions are applicable to nonlinear systems and allow for consideration of nonperiodic, e.g., chaotic modes. Upper and lower bounds for oscillations amplitude are obtained. The relation between the oscillatority bounds and excitability indices for the systems with the input are established. Control design procedure providing nonlinear systems with oscillatority property is proposed. Examples illustrating proposed results for Van der Pol system, Lorenz system, and Hindmarsh–Rose neuron model as well as computer simulation results are given. [less ▲]

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See detailOscillators as Systems and Synchrony as a Design Principle
Sepulchre, Rodolphe ULg

in Menini, L.; Zaccarian, L.; Abdallah, C. T. (Eds.) Current trends in nonlinear systems and control (2005)

The chapter presents an expository survey of ongoing research by the author on a system theory for oscillators. Oscillators are regarded as open systems that can be interconnected to robustly stabilize ... [more ▼]

The chapter presents an expository survey of ongoing research by the author on a system theory for oscillators. Oscillators are regarded as open systems that can be interconnected to robustly stabilize ensemble phenomena characterized by a certain level of synchrony. The first part of the chapter provides examples of design (stabilization) problems in which synchrony plays an important role. The second part of the chapter shows that dissipativity theory provides an interconnection theory for oscillators. [less ▲]

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See detailOsculating circle with microscopes within microscopes
Bair, Jacques ULg; Henry, Valérie ULg

in Foundations of Science (2013), 18(2), 319-325

Classically, an osculating circle at a point of a planar curve is introduced technically, often with formula giving its radius and the coordinates of its center. In this note, we propose a new and ... [more ▼]

Classically, an osculating circle at a point of a planar curve is introduced technically, often with formula giving its radius and the coordinates of its center. In this note, we propose a new and intuitive definition of this concept: among all the circles which have, at the considered point, the same tangent as the studied curve and thus seem equal to the curve through a microscope, the osculating circle is this that seems equal to the curve through a microscope within microscope. [less ▲]

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See detailOSEM reconstruction of pinhole SPECT acquired in body contour mode.
Seret, Alain ULg; Flérès, D.; Defrise, Michel

Poster (2003)

Detailed reference viewed: 40 (1 ULg)
See detailOser la qualité, un référentiel en Communauté française de Belgique et son accompagnement
Pirard, Florence ULg

in Rayna, S.; Bouve, C.; Moisset, P. (Eds.) Pour un accueil de qualité de la petite enfance: quel curriculum ? (2009)

Detailed reference viewed: 46 (3 ULg)
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See detailOser le doctorat
Halleux, Isabelle ULg

Article for general public (2006)

According to the Bologna Process, the doctorate is now the (only) 3rd cycle of the university graduation in Belgium. The doctorate is made of 3 components : the doctoral education, the research works and ... [more ▼]

According to the Bologna Process, the doctorate is now the (only) 3rd cycle of the university graduation in Belgium. The doctorate is made of 3 components : the doctoral education, the research works and the public presentation of the thesis showing the graduate's capacity for creativity, research and dissemination. So that the graduation relies on the academic education as well as on the experience of research and on soft skills capacities. So : dare to do a PhD ? [less ▲]

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See detailThe OSI 95 Connection-mode Transport Service-The Enhanced QoS
Danthine, André ULg; Baguette, Yves; Leduc, Guy ULg et al

in Danthine, André; Spaniol, Otto (Eds.) HIGH PERFORMANCE NETWORKING, IV (1992, December)

During the last ten years, tremendous changes have taken place in the communication environments. First, there has been a continuous increase in network performance that has led, for instance, to ... [more ▼]

During the last ten years, tremendous changes have taken place in the communication environments. First, there has been a continuous increase in network performance that has led, for instance, to increasingly high access data rates available in the lower layers. Furthermore, the changes in the offered network services have raised the issue of providing, at the transport level, services already provided at the subnetwork level, such as multicast or synchronous services for example. With the arrival of new applications, such as multimedia or client/server applications, a widening of the application requirements has also been observed. It is this evolving environment that has been at the origin of the ESPRIT II project OSI 95. An important task in the framework of this project is the definition of an enhanced Transport Service taking account of the aforementioned evolutions. The enhanced Transport Service specified for OSI 95 consists of several types of service. The paper presents the connection-mode Transport Service. We focus mainly on the following original features of our connection-mode service: a new semantics for QoS parameters and the associated negotiation and re-negotiation. [less ▲]

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See detailOSI 95 Enhanced Transport Facilities and Functions
Baguette, Yves; Léonard, Luc; Leduc, Guy ULg et al

Report (1992)

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See detailThe OSI95 Connection-Mode Transport Service
Baguette, Yves; Léonard, Luc; Leduc, Guy ULg et al

in The OSI95 Transport Service with Multimedia Support (1994)

We present the main features of the connection-mode service developed as a part of the entire OSI95 Enhanced Transport Service. This connection-mode service results from modifications and enhancements to ... [more ▼]

We present the main features of the connection-mode service developed as a part of the entire OSI95 Enhanced Transport Service. This connection-mode service results from modifications and enhancements to the standard ISO/IEC Connection-Mode Transport Service. Some of the enhancements are just mentioned in this paper for they are addressed in detail in companion papers. [less ▲]

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See detailOSI95 Contributions to ISO/IEC and ETSI
Leduc, Guy ULg; Danthine, André ULg

in The OSI95 Transport Service with Multimedia Support (1994)

This paper summarizes the activities that were carried out within the standardization bodies ISO/IEC and ETSI during the two-year period of the OSI95 project. However it focuses mainly on the OSI95 ... [more ▼]

This paper summarizes the activities that were carried out within the standardization bodies ISO/IEC and ETSI during the two-year period of the OSI95 project. However it focuses mainly on the OSI95 contributions. [less ▲]

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See detailThe OSI95 Enhanced Transport Services
Baguette; Léonard, Luc; Leduc, Guy ULg et al

Report (1993)

Detailed reference viewed: 19 (3 ULg)
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See detailThe OSIRIS Project (Optical Systems for Interferometric-Photogrammetric Relief Investigation and Scanning). Development of a device for 3D numerical recording of archaeological and epigraphic documents by optoelectronic processes
Laboury, Dimitri ULg; Renotte, Yvon ULg; Tilkens, Bernard et al

in Boehler, Wolfgang (Ed.) PROCEEDINGS OF THE CIPA WG 6 INTERNATIONAL WORKSHOP ON SCANNING FOR CULTURAL HERITAGE RECORDING (2002, September)

Detailed reference viewed: 87 (9 ULg)