In this paper, we propose an efficient (n − t)-out-of-n threshold ring signature scheme which is efficient when t is small compared with n. Our scheme has a kind of dual structure of the Bresson– Stern–Szydlo threshold ring signature scheme [2], which is infeasible when t is small compared with n. In particular, we modify the trap-door one-way permutations in the ring signature scheme, and use ...

In this paper, a new interweave cognitive radio (CR) transmission scheme is analytically presented for energy harvesting (EH)-enabled transmitting nodes. EH is performed via a dedicated power beacon (PB) base station through wireless power transfer, which harvests energy to both primary and secondary systems. The out-band mode-of-operation between PB and the two heterogeneous systems is conside...

Motivated by performance evaluation of a computer communication system, we consider a renewal input, general service time, single-server, and infinite-capacity queuing system with generally distributed time-out threshold. We obtain two-moment approximate formulas for the mean system performance measures (including the mean number of customers in the system and the mean response time) by using t...

Recently, Chai et al. proposed a threshold password authentication scheme that t out of n server nodes could efficiently carry out mutual authentication with a user while preserving strong security requirements in the mobile ad hoc networks. In this article, we will show that their scheme suffers from a number of security vulnerabilities by passive attacks.

We report on our research results on effective volume visualization techniques for medical and anatomical data. Our volume rendering approach employs GPU accelerated out-of-core direct rendering algorithms to fully support high resolution, 16 bits, raw medical datasets as well as segmentation. Images can be presented on a special light field display based on projection technology. Human anatomi...

A new oceanographic measurement concept, Acousti-cally Focused Ocean Sampling-AFOS, is presented, combining a tomographic network with small autonomous underwater vehicles. Using wireless local area network technology, the acoustic tomography data are recorded and processed in real time for achieving a low-resolution estimate of oceanographic parameters. The results are used to focus direct mea...

the coast of bangladesh has a specialty in terms of high bending and many off- shore islands. incorporation of the coastline and island boundaries properly in the numerical scheme is essential for accurate estimation of water levels due to surge. for that purpose a numerical scheme consisting of very fine mesh is required along the coastal belt, whereas this is unnecessary away from the coast. in...

Nucleosome organization in eukaryotic genomes has a deep impact on gene function. Although progress has been recently made in the identification of various concurring factors influencing nucleosome positioning, it is still unclear whether nucleosome positions are sequence dictated or determined by a random process. It has been postulated for a long time that, in the proximity of TSS, a barrier ...

Introduction: Higher B0 fields are expected to optimize fiber tracking and to increase the signal-to-noise ratio which should lead to higher spatial resolution of DTI [1,2]. However, at high fields B1 inhomogeneities are strong and result in sever distortions and signal voids in DTI. The B1 inhomogeneity results in ill-defined pulse angles that vary considerably over the probe volume. Parallel ...

This work presents a novel approach for modelling laminar myelin patterns in the human cortex in brain MR images on the basis of known cytoarchitecture. For the first time, it is possible to estimate intracortical contrast visible in quantitative ultra-high resolution MR images in specific primary and secondary cytoarchitectonic areas. The presented technique reveals different area-specific sig...