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

The impact of changes in oil prices on monetary and trade policy in Algeria (2000-2017)

وبما أن الجزائر تعتبر من بين الدول الريعية التي تعتمد على المدخول البترولي في تنفيذ مشاريعها وبرامجها التنموية فهي كباقي دول العالم الريعية التي تتأثر بتقلبات أسعار البترول في الأسواق العالمية، وأي تحول مفاجئ في الأسعار وما يليه من كساد وازدهار في الدورات الاقتصادية أشياء يصعب على صناع السياسة إدارتها بفعالية. فإن التقلب في الأسعار قد مارس تأثيرات على السياسات الاقتصادية للدولة وذلك نتيجة أن السياسة النقدية والتجارية والسياسة المالية تتأثر سلبا وإيجابا مع حجم الإيرادات البترولية المتقلبة، فشهدت الجزائر حالات التقلب الإيجابية والسلبية لأسعار البترول خلال الفترة 2000-2017، فمن بداية سنة 2000 إلى غاية 2014 عرفت بحبوحة مالية من خلال الفوائض الناتجة عن ارتفاع أسعار البترول وفي الفترة 2015-2017 عرفت عجزا في العوائد المالية، لذلك سعت الجزائر إلى اتخاذ التدابير اللازمة لاستقرار اقتصادها في تلك الحالتين، وذلك عن طريق سياستها الاقتصادية المعتمدة.As Algeria is considered among the rentier states that depend on oil revenues in the implementation of projects and development programs, like other rentier countries of the world, they are affected by fluctuations in oil prices in world markets, and any sudden shift in prices and the subsequent recession and prosperity in economic cycles are situations that policymakers find it difficult to manage effectively. The volatility of prices has exerted effects on the economic policies of the state as a result of monetary and trade policy and fiscal policy negatively affected and positively with the volume of volatile oil revenues, Algeria witnessed the positive and negative fluctuations of oil prices during the period 2000-2017, from the beginning of 2000 to 2014 known In fiscal terms through surpluses resulting from the high oil prices and in the period 2015-2017 has been characterized by a deficit in financial returns, so Algeria sought to take the necessary measures to stabilize its economy in both cases, through its adopted economic polic

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-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

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)°

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