HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt età la diffusion de documents scientifiques de niveau r...

The original power controlled multiple access (PCMA) protocol does not support service differentiation. In this paper, we extend PCMA to form a new media access control protocol supporting service differentiation in mobile ad hoc networks. To support QoS, we first introduce the in-station access category concept in 802.11e to PCMA. For service differentiation between access categories, our majo...

Interband cascade lasers are semiconductor emitting in the mid-infrared domain but relying on interband transitions, contrary to their intersubband counterparts, quantum lasers. Our experimental study of relative intensity noise a multi-mode laser at 4.1 ?m shows that room-temperature structure exhibits relaxation frequency GHz range. We demonstrate that, far above threshold current, increases ...

Knowledge work depends, almost by its very definition, on the use of information and data. Large amounts of information resides in the form of so-called “unstructured data” available in large organizations. Thus, leveraging available content in the knowledge processes in large organizations has been identified as an important opportunity. Many see content as a strategic element in the processes...

In [10, 18] the transformation technique has been proposed to store k-dimensional intervals { which serve as bounding boxes for arbitrary geometric objects in many applications { as 2k-dimensional points in a point access structure. Unfortunately the transformation technique has two pitfalls: (1) The transformation leads to a skew distribution of the 2k-dimensional image points. (2) Processing ...

A secret sharing scheme is non-perfect if some subsets of participants that cannot recover the secret value have partial information about it. The information ratio of a secret sharing scheme is the ratio between the maximum length of the shares and the length of the secret. This work is dedicated to the search of bounds on the information ratio of non-perfect secret sharing schemes. To this en...

Recently, three-dimensional structured ceramic composites with large threshold strengths (i.e., stress below which there is zero probability of failure) have been fabricated utilizing an architecture consisting of relatively stress-free, elongated prismatic domains, separated by thin compressive walls. We build upon prior work on laminate architectures, with the common feature that these struct...

A non-interactive (t,n)-publicly veriable secret sharing scheme (non-interactive (t,n)-PVSS scheme) is a (t,n)-secret sharing scheme in which anyone, not only the participants of the scheme, can verify the correctness of the produced shares without interacting with the dealer and participants. The (t,n)-PVSS schemes have found a lot of applications in cryptography because they are suitable for<...

In the past few decades, the significant developments in database and networking technologies contributed to advances in distributed database systems (DDS). The data allocation is a prominent issue in distributed database systems and is performed on data access static and dynamic patterns. This paper proposes a new strategy named Extended Threshold Algorithm (ETA) for non-redundant dynamic data...