The linear pentadecapeptide gramicidin A (GA) HCO-L-Val-Gly-L-Ala-Z)Leu4-L-Ala-£»-Val-L-Val-Z?-Val-LTrp-Z^Leu-L-Trp-Z>-Leu-L-TrpD-Leu-L-Trp-NHCH2CH2OH attracts attention due to its ability to form monovalent cations permeable channels in membranes. Once it has been appreciated (1), that two molecules of GA are combined in such a way as to span the membrane bilayer (Fig. 1) a number of detailed ...

We consider a Spatial Division Multiple Access (S.D.M.A.) situation in which p users operate on the same carrier frequency and use the same linear digital modulation format. We consider m > p antennas receiving mixtures of these signals through multi-path propagation (equivalently, oversampling of the received signals of a smaller number of antenna signals could be used). Current approaches to ...

3 Résumé long de la thése en français 5 Introduction 15 1 State of the Art and Mathematical Background 20 1.1 Cooperative Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 1.1.1 General Context . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 1.1.2 Cooperative Communications Protocols . . . . . . . . . . . . . . . . . . . . . . . ....

P. D. García,* R. Sapienza, J. Bertolotti, M. D. Martín, Á Blanco, A. Altube, L. Viña, D. S. Wiersma, and C. López Instituto de Ciencia de Materiales de Madrid (CSIC) and Unidad Asociada CSIC-UVigo, Cantoblanco 28049 Madrid, Spain European Laboratory for Nonlinear Spectroscopy & INFM-BEC, 50019 Sesto Fiorentino (Florence), Italy Departamento de Fisica de Materiales, Universidad Autonoma de Madr...

An IBM eServer zSeries system uses various types of microcode (firmware) that implement functions such as the execution of complex instructions in the CPUs, I/O operations performed by the system assist processors (SAPs), the management of logical partitions (LPARs), and control by the support element (SE). Each microcode component must be verified by itself and in conjunction with the others. ...

This paper studies the problem of secure communication over a wiretap channel p(y, z|x) with a secure feedback link of rate Rf , where X is the channel input, and Y and Z are channel outputs observed by the legitimate receiver and the eavesdropper, respectively. It is shown that the secrecy capacity, the maximum data rate of reliable communication while the intended message is not revealed to t...

We discuss the lattice QCD simulations that search for the Z+ c with the unconventional quark content c̄cd̄u in the channel IG(JPC) = 1+(1+−). The major challenge is presented by the two-meson states J/ψ π , ψ2Sπ , ψ1Dπ , DD̄∗, D∗D̄∗, ηcρ that are also inevitably present in this channel. The available lattice simulations find expected two-meson eigenstates, but no additional eigenstate as a candida...

We examine the scenario where a leptophobic Z ′ boson accounts for the excess of events in the Wjj channel as observed by CDF. We assume generation independent couplings for the Z ′ and obtain allowed regions for the four hadronic couplings using the measured cross section as well as constraints from dijet production at UA2. These coupling regions translate into well-determined rates for the as...

Decentralized ledger-based cryptocurrencies such as Bitcoin provide a means to construct payment systems without requiring a trusted bank, yet the anonymity of Bitcoin is proved to be far from enough. Zerocash is the first full-fledged anonymouse digital currency based on the blockchain technology, using zk-SNARK as the zero-knowledge module for the privacy preserving. Zerocash solves the priva...

In secure two-party computation, two mutually distrusting parties are interested in jointly computing a function, while preserving the privacy of their respective inputs. However, when communicating over a clear channel, security against computationally unbounded adversaries is impossible. Thus is the importance of noisy channels, over which we can build Oblivious Transfer (OT), a fundamental p...