Performance Analysis Of Resource Scheduling In LTE Femtocells Networks

3GPP has introduced LTE Femtocells to manipulate the traffic for indoor users and to minimize the charge on the Macro cells. A key mechanism in the LTE traffic handling is the packet scheduler which is in charge of allocating resources to active flows in both the frequency and time dimension. So several scheduling algorithms need to be analyzed for femtocells networks. In this paper we introduce a performance analysis of three distinct scheduling algorithms of mixed type of traffic flows in LTE femtocells networks. The particularly study is evaluated in terms of throughput, packet loss ratio, fairness index and spectral efficiencyComment: 11 pages, 9 figures, 3 tables, The Sixth International Conference on Networks & Communications (NETCOM - 2014

3-{[3-(4-Meth­oxy­phen­yl)-4,5-dihydro-1,2-oxazol-5-yl]meth­yl}-1,5-dimethyl-1H-1,5-benzodiazepine-2,4(3H,5H)-dione

The mol­ecule of the title compound, C22H23N3O4, features a benzodiazepine fused-ring system whose seven-membered ring adopts a boat-shaped conformation (with the C atoms of the fused-ring as the stern and the methine C atom as the prow). The methyl­ene C atom connected to the methine C atom occupies an equatorial position. The methyl­ene C atom is connected to the five-membered oxazole ring, both of which are disordered over two positions in a 0.634 (4):0.366 (4) ratio. Weak inter­molecular C—H⋯O hydrogen bonding is present in the crystal structure

3-[(1-Benzyl-1H-1,2,3-triazol-5-yl)methyl]-1,5-dimethyl-1,5-benzodiazepine-2,4-dione monohydrate

In the title compound, C21H21N5O2·H2O, the seven-membered ring adopts a boat-shaped conformation with the methine C atom as the prow. In the crystal, the water mol­ecule links adjacent mol­ecules by O—H⋯O and O—H⋯N hydrogen bonds into a zigzag chain running along the c axis of the monoclinic cell

3-Benzoyl-1,5-dimethyl-1H-1,5-benzodiazepine-2,4(3H,5H)-dione

The seven-membered ring of the title compound, C18H16N2O3, adopts a boat-shaped conformation (with the C atoms of the fused ring as the stern and the methine C atom as the prow). The substituent at the 3-position occupies an axial position, and the aromatic ring of the substituent is arched over the seven-membered ring in a parasol-like manner, the dihedral angle between the phenyl­ene and phenyl rings being 28.7 (1)°

3-Hexadecyl-1,5-dimethyl-1H-1,5-benzo­diazepine-2,4(3H,5H)-dione

In the title mol­ecule, C27H44N2O2, the seven-membered ring adopts a boat-shaped conformation, with two C atoms of the fused benzene ring forming the stern and the methine C atom forming the prow. The hexa­decyl substituent occupies an equatorial position, with the aliphatic chain exhibibiting an extended zigzag conformation

Etude de l'erreur de positionnement de l'outil dans le procédé de soudage FSW robotisé

Le soudage par friction-malaxage (Friction Stir Welding FSW) est un procédé de soudage qui permet d'assembler deux pièces sans fusion de matière. Généralement ce procédé est réalisé par des machines FSW rigides et spécialement développées qui offrent d'excellentes caractéristiques mais qui nécessitent des investissements importants. Cette étude porte sur la robotisation du procédé par l'utilisation de manipulateur industriel capable de manipuler de fortes charges. Le procédé FSW nécessite des forces d'appui très importantes, qui peuvent aller jusqu'à 10kN. Lors du soudage, l'application de ces efforts engendre une déformation du robot liée au manque de rigidité. Cette déformation provoque des erreurs entre la position désirée et la position réelle de l'outil. L'objectif de ce travail est de trouver des solutions pour minimiser l'erreur par des dispositifs d'assistance mécanique liés au robot