421 research outputs found
Scalable Group Secret Key Generation over Wireless Channels
In this paper, we consider the problem of secret key generation for multiple
parties. Multi-user networks usually require a trusted party to efficiently
distribute keys to the legitimate users and this process is a weakness against
eavesdroppers. With the help of the physical layer security techniques, users
can securely decide on a secret key without a trusted party by exploiting the
unique properties of the channel. In this context, we develop a physical layer
group key generation scheme that is also based on the ideas of the analog
function computation studies. We firstly consider the key generation as a
function to be computed over the wireless channel and propose two novel methods
depending on the users transmission capability (i.e. half-duplex and
full-duplex transmissions). Secondly, we exploit the uniqueness of the prime
integers in order to enable the simultaneous transmission of the users for key
generation. As a result, our approach contributes to the scalability of the
existing physical layer key generation algorithms since all users transmit
simultaneously rather than using pairwise communications. We prove that our
half-duplex network model reduces the required number of communications for
group key generation down to a linear scale. Furthermore, the full-duplex
network model reduces to a constant scale.Comment: 7 pages, 3 figure, transaction
Initial maternal meiotic I error leading to the formation of a maternal i(2q) and a paternal i(2p) in a healthy male
We report on the investigation of the parental origin and mode of formation of the two isochromosomes, i(2p) and i(2q), detected in a healthy adult male. Conventional cytogenetic analysis revealed the proband’s lack of structurally normal chromosomes 2, these being replaced by an i(2p) and an i(2q). Investigation of the parental origin of the isochromosomes revealed a paternal origin of the i(2p) chromosome and a maternal origin of the i(2q) chromosome. Thus, the formation of both isochromosomes, or at least of the paternal i(2p), appears to have occurred postzygotically. Interestingly, whilst a paternal isodisomy was observed for the entire 2p, maternal heterodisomy was detected for two segments of 2q, separated by a segment showing isodisomy. The results are indicative of an initial error (non-disjunction or i(2q) formation) concerning the maternal chromosomes 2 during meiosis I, which likely favored the subsequent mitotic recombination event resulting in the presence of two isochromosomes. To the best of our knowledge this is the first case of an initial meiotic error, followed by postzygotic trisomy rescue through the formation of isochromosomes, resulting in a normal phenotype. A prenatal detection, by cytogenetic and molecular analysis, of such chromosome abnormality would have led to the incorrect conclusion of a most likely poor prognosis for the fetus
Compressive Response of Polycrystalline NiCoMnGa High-Temperature Meta-magnetic Shape Memory Alloys
The effects of the addition of quaternary element, Co, to polycrystalline NiMnGa alloys on their magnetic and shape memory properties have been investigated. NiCoMnGa polycrystalline alloys have been found to demonstrate good shape memory and superelasticity behavior under compression at temperatures greater than 100 °C with about 3% transformation strain and low-temperature hysteresis. It is also possible to train the material to demonstrate a large two-way shape memory effect
Exchange-bias phenomenon: The role of the ferromagnetic spin strucutre
The exchange bias of antiferromagnetic-ferromagnetic (AFM-FM) bilayers is found to be strongly dependent on the ferromagnetic spin configuration. The widely accepted inverse proportionality of the exchange bias field with the ferromagnetic thickness is broken in FM layers thinner than the FM correlation length. Moreover, an anomalous thermal dependence of both exchange bias field and coercivity is also found. A model based on springlike domain walls parallel to the AFM-FM interface quantitatively accounts for the experimental results and, in particular, for the deviation from the inverse proportionality law. These results reveal the active role the ferromagnetic spin structure plays in AFM-FM hybrids which leads to a new paradigm of the exchange bias phenomenon
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