we proposed a link protocol called Burstoriented Transfer with Time-bounded Retransmission (BTTR) for wireless real-time communications. This scheme uses a large transmission window for sending/receiving a burst of timesensitive data, and within this window, another smaller observation window is repeatedly used for dynamic error retransmission(s). There is time limitation on each retransmission...

We first present a new formulation of parabolic approximation of the Maxwell equations for heterogeneous dielectric materials. We then discuss rigorous results about selfaveraging scaling limits of parabolic waves in terms of the Wigner distribution function. Among the 6 possible scaling limits two are exactly solvable. We use the Green function to analyze the time reversal operation in turbule...

Two equally skilled groups of students taking introductory mechanics solve related physics problem pairs in reverse order with respect to each other, using the web-based Socratic tutor, MasteringPhysics. In tutorial problems containing help in the form of requestable hints, descriptive text, and feedback, twice as many students were able to complete problems correctly in real-time compared to p...

Aims. We present first results and tests of a time-dependent extension to the general purpose model atmosphere code PHOENIX. We aim to produce light curves and spectra of hydro models for all types of supernovae. Methods. We extend our model atmosphere code PHOENIX to solve time-dependent non-grey, NLTE, radiative transfer in a special relativistic framework. A simple hydrodynamics solver was i...

We attack the problem of perfect equalizability of multi-user channels, in which the usual linear time-invariant assumption is dismissed. In the linear, time-invariant case, condition for perfect equalizability is plain and expressed in terms of the column rank of the channel’s transfer matrix. Using the module-theoretic approach developped by Fliess, in which the transfer matrix of a time-vary...

In this paper, model sets for linear time-invariant discrete-time systems spanned by fixed orthonormal bases are studied. It is shown that the Fourier series of the system transfer function with respect to these bases converges uniformly on the unit circle if the frequency response of the system is Dini-Lipschitz continuous.

Two well-known disturbance decoupling problems are considered. A checkable necessary and su cient condition is derived under which the disturbance decoupling problem with static measurement feedback (DDPKM) is solvable for a class of multi-input and multi-output linear time-invariant systems, which have a left invertible transfer matrix function from the control input to the controlled output....

The response of a linear time-invariant process on a stochastic input signal is characterized by the transfer function. Unknown past inputs and puture output are s0u1'ces of inaccuracy in relating a finite segment of an output signal via an estimated transfer function to the corresponding input segment. These end effects are usually characterized with error bounds on the Fourier transform of th...

In this paper, H∞ control for a class of linear time invariant systems with infinitely many unstable poles is considered. An example of such a plant is a high gain system with delayed feedback. We formulate the problem via a generalized plant which consists of a rational transfer matrix and the inverse of a scalar (possibly irrational) inner function. It is shown that the problem can be separat...

Time is Important To the Editor: Dalby et al1 have produced a meta-analysis on the transfer of patients for primary angioplasty versus non-transfer thrombolysis in acute myocardial infarction. Their conclusion from a collaboration of 6 papers is that primary angioplasty is the optimal method of treatment, rather than local thrombolytic therapy, despite delays in transfer times to tertiary refer...