Results 31 to 40 of about 3,423,318 (318)

Time-varying modulation systems

IET Communications, 2012
In the current communication standards, like WiMAX and LTE, the modulation system has usually fixed symbol block length or fixed subcarrier number. In this study, the authors introduce a new concept, namely time-varying symbol block or time-varying subcarrier number into the modulation systems to improve the system performance. The authors call the new
G. Wang, K. Shao, L. Zhuang
openaire   +1 more source

Pattern formation in individual-based systems with time-varying parameters

, 2013
We study the patterns generated in finite-time sweeps across symmetry-breaking bifurcations in individual-based models. Similar to the well-known Kibble-Zurek scenario of defect formation, large-scale patterns are generated when model parameters are ...
Ashcroft, Peter, Galla, Tobias
core   +1 more source

Achieving synchronization in arrays of coupled differential systems with time-varying couplings [PDF]

, 2013
In this paper, we study complete synchronization of the complex dynamical networks described by linearly coupled ordinary differential equation systems (LCODEs).
Chen, Tianping, Lu, Wenlian, Yi, Xinlei
core   +3 more sources

Density Criteria for the Identification of Linear Time-Varying Systems

, 2015
This paper addresses the problem of identifying a linear time-varying (LTV) system characterized by a (possibly infinite) discrete set of delays and Doppler shifts. We prove that stable identifiability is possible if the upper uniform Beurling density of
Aubel, Céline, Bölcskei, Helmut
core   +1 more source

Finite-time stabilization of stochastic systems with varying parameters

AIMS Mathematics, 2023
This research deals with the stabilization of the stochastic nonlinear systems. In order to achieve the asymptotic stability in probability with respect to unknown bounded disturbances, a control Lyapunov function is applied to present a modified Sontag ...
Wajdi Kallel , Noura Allugmani
doaj   +1 more source

Further Results on Lyapunov Functions for Slowly Time-Varying Systems

, 2006
We provide general methods for explicitly constructing strict Lyapunov functions for fully nonlinear slowly time-varying systems. Our results apply to cases where the given dynamics and corresponding frozen dynamics are not necessarily exponentially ...
Malisoff, Michael, Mazenc, Frederic
core   +3 more sources

Quadratic Performance Analysis of Switched Affine Time–Varying Systems

International Journal of Applied Mathematics and Computer Science, 2018
We analyze quadratic performance for switched systems which are composed of a finite set of affine time-varying subsystems, where both subsystem matrices and affine vectors are switched, and no single subsystem has desired quadratic performance.
Li Wenzhi, Huang Chi, Zhai Guisheng
doaj   +1 more source

The Necessity for a Time Local Dimension in Systems with Time Varying Attractors

, 1996
We show that a simple non-linear system of ordinary differential equations may possess a time varying attractor dimension. This indicates that it is infeasible to characterize EEG and MEG time series with a single time global dimension.
Abarbanel, Ashkenazy, Ashkenazy, Babloyantz, Babloyantz, Baker, Ding, Dvorak, Eckmann, Elbert, Frisch, Grassberger, J. Levitan, K. Saermark, Kowalick, M. Lewkowicz, Mayer-Kress, Mayer-Kress, Mayer-Kress, Pawelzik, Renyi, Ruelle, Saermark, Saermark, Sigeti, Smith, Takens, Theiler, Wolf, Y. Ashkenazy   +29 more
core   +2 more sources

A Quality Improvement Initiative to Standardize Pneumocystis jirovecii Pneumonia Prophylaxis in Pediatric Patients With Solid Tumors

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Background Pediatric patients with extracranial solid tumors (ST) receiving chemotherapy are at an increased risk for Pneumocystis jirovecii pneumonia (PJP). However, evidence guiding prophylaxis practices in this population is limited. A PJP‐related fatality at our institution highlighted inconsistent prescribing approaches and concerns about
Kriti Kumar, Denise M. Connolly, Ellen Kellington, Elyse Zelunka, Karla Kerrigan, Furqan Shaikh, Paul C. Nathan, Meredith S. Irwin, Sarah Cohen‐Gogo   +8 more
wiley   +1 more source

Psychosocial Outcomes in Patients With Endocrine Tumor Syndromes: A Systematic Review

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Introduction The combination of disease manifestations, the familial burden, and varying penetrance of endocrine tumor syndromes (ETSs) is unique. This review aimed to portray and summarize available data on psychosocial outcomes in patients with ETSs and explore gaps and opportunities for future research and care.
Daniël Zwerus, Floortje Strobbe, Annemarie A. Verrijn Stuart, Hanneke M. van Santen, Gerlof D. Valk, Sasja A. Schepers, Rachel S. van Leeuwaarde   +6 more
wiley   +1 more source