To assess the protein quality and the nutritive value of seven Algerian local sorghum cultivars, the in vitro pepsin digestibility was determined, which ranged from 25.0% to 65.0%, and the amino acid composition of each cultivar was compared with other sorghum cultivars. In addition, the amino acid scores (AAS) and the protein digestibility-corrected amino acid scores (PDCAAS) were calculated. Relative to the WHO protein standard, most of the sorghum cultivars tested, scored very high AAS, with values ranging between 0.9 and 2.6 except for lysine, methionine and cysteine. The PDCAAS were high for Ain Salah cultivars AS1 and AS3, however, all other cultivars showed low values except for leucine. This study confirmed that in terms of both quantity and quality, sorghum proteins could serve as a source of essential amino acids and as a potential source of proteins in the future. 相似文献
The need for on-demand QoS support for communications over satellite is of primary importance for distributed multimedia applications.
This is particularly true for the return link which is often a bottleneck due to the large set of end-users accessing a very limited uplink resource. Facing this need,
Demand Assignment Multiple Access (DAMA) is a classical technique that allows satellite operators to offer various types of
services, while managing the resources of the satellite system efficiently. Tackling the quality degradation and delay accumulation
issues that can result from the use of these techniques, this paper proposes an instantiation of the Application Layer Framing
(ALF) approach, using a cross-layer interpreter (xQoS-Interpreter). The information provided by this interpreter is used to manage the resource provided to a terminal by the satellite system
in order to improve the quality of multimedia presentations from the end user’s point of view. Several experiments are carried
out for different loads on the return link. Their impact on QoS is measured through different application as well as network
level metrics.
Although very developed in many sectors (databases, filesystems), access control schemes are still somewhat elusive when it
comes to wireless sensor networks. However, it is clear that many WSN systems—such as healthcare and automotive ones—need
a controlled access to data that sensor nodes produce, given its high sensitivity. Enforcing access control in wireless sensor
networks is a particularly difficult task due to the limited computational capacity of wireless sensor nodes. In this paper
we present a full-fledged access control scheme for wireless sensor data. We enforce access control through data encryption,
thus embedding access control in sensor data units. We also propose a lightweight key generation mechanism, based on cryptographic
hash functions, that allows for hierarchical key derivation. The suggested protocol only relies on simple operations, does
not require interactions between nodes and data consumers and has minimal storage requirements.
Piervito ScagliosoEmail:
Alessandro Sorniotti
has a double MSc degree from Politecnico di Torino (Turin, Italy) in Computer Science and from EURECOM in Networking. He also
obtained a Research Master diploma (DOA) in Networking and Distributed Systems from Université de Nice-Sophia Antipolis (UNSA,
Nice, France). Alessandro has won a scholarship (bourse CIFRE) and he is a PhD candidate at ENST, working as a Research Associate
at SAP Labs France. His current research topic is the study of protocols for Secret Exchange, Secret Matching and Secret Handshake.
Refik Molva
is a full professor and the head of the Computer Communications Department at Institute Eurécom in Sophia Antipolis, France.
His current research interests are the design and evaluation of protocols for security and privacy in self-organizing systems.
He previously worked on several research projects on multicast and mobile network security, anonymity and intrusion detection.
Beside security, he worked on distributed multimedia applications over high speed networks and on network interconnection.
Prior to joining Eurécom, he worked in the Zurich Research Laboratory of IBM where he was one of the key designers of the
KryptoKnight security system. He also worked as a consultant in security for the IBM Consulting Group. He has a PhD in Computer
Science from the Paul Sabatier University in Toulouse (1986) and a BSc in Computer Science (1981) from Joseph Fourier University,
Grenoble, France.
Laurent Gomez
is a senior researcher at SAP Research France since 2001. He is currently involved in WASP and ATLAS projects. His research
activities are focused on security and context-aware systems. Prior to joining SAP Research, Laurent Gomez worked as engineer
at research projects for Ericsson. He has a strong background in security of mobile applications, with a focus on context-aware
systems. Laurent holds a Engineer Degree in Computing Systems from ESSI (Ecole Superieure en Sciences Informatique), Nice
France.
Christophe Trefois
received his BSc degree in Communication Systems from the Ecole Polytechnique Fédérale de Lausanne (EPFL) in Switzerland in
2006. In 2008, he obtained his MSc degree in Communication Systems from EPFL. From March to August 2008, he worked as a Research
Assistant at SAP Labs France in Sophia Antipolis. Christophe is currently working as an IT Consultant at Ernst & Young Luxembourg
and is a member of the ISACA Lux Chapter.
Annett Laube
joined SAP Research Security & Trust program in 2006. She is a senior researcher currently leading in the WASP project. Prior
to joining SAP, she worked at IBM Scientific Center in Heidelberg in the areas of machine translation of natural languages
and text mining. Later she worked as an IBM consultant for e-business and data warehouse. In parallel she wrote her PhD thesis
about the translation of dependency structures in the transfer process from one natural language to another. She started to
work for SAP in 2001 at SAP Labs Montreal/Quebec and worked as a software developer for Supply Chain Event Management.
Piervito Scaglioso
received his MSc degree from Politecnico di Torino in 2006. He is currently enrolled as PhD student in the Department of Computer
Science at the Politecnico di Torino. His research interests include: Policy-based system and their application to manage
access control, access control for wireless sensor network and hierarchical key management scheme.
相似文献
The influence of the support synthesis for the preparation of supported Pd/LaFeO3 perovskite based catalysts and the nature of the palladium precursor on the catalytic performances in the selective reduction of NO to N2 by hydrocarbons have been investigated. According to the preparation method, subsequent surface and bulk characterisation revealed significant changes in the degree of dispersion and the chemical environment of oxidic palladium species depending on the extent of interaction with the support. Pd nitrate precursor leads to the stabilisation of the Pd surface concentration. The metal support interactions thus obtained strongly enhance the catalytic performances, particularly the resistance to thermal ageing whereas sol–gel synthesis produces the higher support activity. 相似文献
Whereas the house mouse (Mus domesticus) has been studied extensively in terms of physiology/behavior and pheromonal attributes, the evolutionarily related mound-building
mouse (Mus spicilegus) has received attention only recently due to its divergent behavioral traits related to olfaction. To date, no chemical studies
on urinary volatile compounds have been performed on M. spicilegus. The rationale for our investigations was to determine if there are differences in urinary volatiles of intact and castrated
M. spicilegus males and to explore further whether this species could utilize the same or structurally similar pheromones as the male house
mouse, M. domesticus. The use of capillary gas chromatography/mass spectrometry (GC-MS) together with sorptive stir bar extraction sampling enabled
quantitative comparisons between the intact and castrated M. spicilegus urinary profiles. Additionally, through GC-MS and atomic emission (sulfur-selective) detection, we identified qualitative
molecular differences between intact M. spicilegus and M. domesticus. A series of volatile and odoriferous lactones and the presence of coumarin were the unique features of M. spicilegus, as was the notable absence of 2-sec-butyl-4,5-dihydrothiazole (a prominent M. domesticus male pheromone) and other sulfur-containing compounds. Castration of M. spicilegus males eliminated several substances, including δ-hexalactone and γ-octalactone, and substantially decreased additional compounds,
suggesting their possible role in chemical communication. Some other M. domesticus pheromone components were also found in M. spicilegus urine. These comparative chemical analyses support the notion of metabolic similarities as well as the uniqueness of some
volatiles for M. spicilegus, which may have a distinct physiological function in reproduction and behavior. 相似文献
Collective particle behavior such as interparticle coordination and particle rearrangement plays a significant role in the sintering of heterogeneous powder systems. Those phenomena have been investigated by in situ X-ray microtomography and discrete element simulation (DEM). In situ 3D images of sintering copper-based systems have been obtained at the European Synchrotron Research Facilities. The sintered systems comprise a dense packing of atomized copper powder with a size range of 0–63 μm and the same powder including artificial pores. Quantitative analysis of these images provided valuable data on local strain, coordination number, and particle movement. The sintering of the same systems has been simulated with the discrete element code dp3D. From this set of information, the importance of collective behavior on densification and microstructural evolution is assessed and the relevance of DEM to describe it is discussed. 相似文献
A novel series of diarylpyrimidine analogues (DAPYs) featuring a naphthyl moiety at the C4 position were designed, with all compounds exhibiting strong activity against wild‐type HIV‐1.
We address the problem of the segmentation of cerebral white matter structures from diffusion tensor images (DTI). A DTI produces, from a set of diffusion-weighted MR images, tensor-valued images where each voxel is assigned with a 3 x 3 symmetric, positive-definite matrix. This second order tensor is simply the covariance matrix of a local Gaussian process, with zero-mean, modeling the average motion of water molecules. As we will show in this paper, the definition of a dissimilarity measure and statistics between such quantities is a nontrivial task which must be tackled carefully. We claim and demonstrate that, by using the theoretically well-founded differential geometrical properties of the manifold of multivariate normal distributions, it is possible to improve the quality of the segmentation results obtained with other dissimilarity measures such as the Euclidean distance or the Kullback-Leibler divergence. The main goal of this paper is to prove that the choice of the probability metric, i.e., the dissimilarity measure, has a deep impact on the tensor statistics and, hence, on the achieved results. We introduce a variational formulation, in the level-set framework, to estimate the optimal segmentation of a DTI according to the following hypothesis: Diffusion tensors exhibit a Gaussian distribution in the different partitions. We must also respect the geometric constraints imposed by the interfaces existing among the cerebral structures and detected by the gradient of the DTI. We show how to express all the statistical quantities for the different probability metrics. We validate and compare the results obtained on various synthetic data-sets, a biological rat spinal cord phantom and human brain DTIs. 相似文献