Proactive content caching at user devices and coded delivery is studied considering a non-uniform file popularity distribution. A novel centralized uncoded caching and coded delivery scheme, which can be applied to large file libraries, is proposed. The proposed cross-level coded delivery (CLCD) scheme is shown to achieve a lower average delivery rate than the state of art. In the proposed CLCD...

Implicit dealiasing is a method for computing in-place linear convolutions via fast Fourier transforms that decouples work memory from input data. It offers easier memory management and, for long one-dimensional input sequences, greater efficiency than conventional zero-padding. Furthermore, for convolutions of multidimensional data, the segregation of data and work buffers can be exploited to ...

Introduction PROPELLER [1] and Turboprop DWI [2] have shown advantages over traditional EPI DWI which include higher resolution, relative insensitivity to motion and robustness to off-resonance. In this work, we propose a new sequence dubbed TURBINE (TURBoprop IN Elevation), which adapts the TurboProp scheme to 3D DWI imaging. The potential benefits of this approach over EPI and turboprop inclu...

The application of medical textiles used in woundcare nursing, implants, and healthcare and hygiene products has been discussed. The production and properties of biodegradable polysaccharide fibres obtained from natural sources, such as alginate, chit in/chitosan, collagen, catgut and branan ferulate, have been highl ighted. Speciality medical polymeric fibres used for produci ng wound dressing...

Tiling is a well-known loop transformation technique to enhance temporal data locality. In our previous work, we have developed a skewed tiling technique for relaxation codes, which requires to apply loop skewing before loop tiling. In this paper, we study how to effectively usc the level-two cache for skewed tiling through a tile-size selection algorithm, STS. Particularly, we address two ques...

Low-latency anonymous communication protocols in general, and the popular onion-routing protocol in particular, are broken against simple timing attacks. While there have been few proposed solutions to this problem when the adversary is active, several padding schemes have been proposed to defend against a passive adversary that just observes timing patterns. Unfortunately active adversaries ca...

A multiple access system is developed in this paper by means of Linear Periodic Time Varying (LPTV) filters. We construct an LPTV−based Multiple Access (LPTVMA) system with complex modulators and matrix interleavers. This LPTVMA system has good spreading properties and small Multi User Interference (MUI). However, the equalization problem of such LPTV filters in stationary multipath channels re...

The study of the human visual system (HVS) is very interesting to quantify the quality of an image or to predict perceived information. The contrast sensitivity function (CSF) is one of the main ways to incorporate the HVS properties in an imaging system. It characterizes its sensitivity to spatial and temporal frequencies. In this paper we are interested in establishing a metric with full refe...

Generalized Frequency Division Multiplexing (GFDM) with its flexible pulse shaping filters can provide extremely low out of band leakage to adjacent legacy channels. This makes it an attractive choice for a PHY layer of cognitive radios operating in fragmented TV white spaces. Introducing zero padding to the transmission data block significantly reduces the said out of band leakage even further...

In this paper a new induction motor speed method based on Chirp-Z Transform and zero padding of the supply current is presented. The algorithm has been implemented on a microprocessor. A virtual instrument has been built to control and to monitor on line motor speed. The motor speed method has been tested on a 7.5 kW induction motor driven by a pulse width modulation voltage source inverter for...