5,236 research outputs found
An adaptive loss-aware flow control scheme for delay-sensitive applications in OBS networks
No full textOptical Burst Switching (OBS) is one of the most promising switching technologies for next generation optical networks. As delay-sensitive applications such as Voice-over-IP (VoIP) have recently become popular, OBS networks should guarantee stringent Quality of Service (QoS) requirements for such applications. Thus, this paper proposes an Adaptive Loss-aware Flow Control (ALFC) scheme, which adaptively decides on the burst offset time based on loss-rate information delivered from core nodes for assigning a high priority to delay-sensitive application traffic. The proposed ALFC scheme also controls the upper-bounds of the factors inducing delay and jitter for guaranteeing the delay and jitter requirements of delay-sensitive application traffic. Moreover, a piggybacking method used in the proposed scheme accelerates the guarantee of the loss, delay, and jitter requirements because the response time for. flow control can be extremely reduced up to a quarter of the Round Trip Time (RTT) on average while minimizing the signaling overhead. Simulation results show that our mechanism can guarantee a 10(-3) loss-rate under any traffic load while offering satisfactory levels of delay and jitter for delay-sensitive applications.The work was supported in part by the Korea Science and Engineering foundation(KOSEF) grant funded by the Korea government(MEST) (No.R11-2000-074-01001-0) and MIC, Korea under the ITRC program (ITAC1090060300350001000100100) supervised by IITA
A cross-layer approach for TCP optimization over wireless and mobile networks
No full textWe propose a path recovery notification (TCP-PRN) mechanism to prevent performance degradation during a handoff. Even though Freeze-TCP achieves a performance increase during hancloff, detecting accurate handoff time and the vulnerability of high variation in the round trip time (RTT) become obstacles for deploying Freeze-TCP in a real environment. The proposed protocol, TCP-PRN, quickly recovers lost packets by restoring the congestion window, preventing the congestion window to decrease, or immediately initiating the slow start algorithm. The simulation results of our study show better performance in a more realistic environment where the handoff prediction is difficult and the variation of RTT is higher. (c) 2008 Elsevier B.V. All rights reserved.This work was partially supported by the Korea Science and Engineering Foundation (KOSEF) grant funded by the Korea government(MOST)(No. R11-2000-074-02006-0). This work was partially supported by 2nd Phase of Brain Korea 21 project sponsored by Ministry of Education and Human Resources Development, Korea
Pt3Mn Intermetallic Catalysts for Oxygen Reduction Reaction in PEMFCs with Improved Activity and Durability
No full textCatalogue of Central College Library, at Fayette, Mo. 1887
No full textPamphlet entitled "Catalogue of Central College Library at Fayette, Mo. 1887." 57 pages. 15.5 cm high. Has index of author names, possibly missing some pages. Several writings in pencil and stray pencil marks
Revealing the influence of Mo addition on interphase precipitation in Ti-bearing low carbon steels
No full textMo is widely used as an effective microalloying element to improve mechanical performance of interphase precipitation steels, but the precise role of Mo in interphase precipitation behavior is not fully understood. In this contribution, interphase precipitation behavior in a series of Ti-Mo-bearing low carbon steels is systematically studied, and the role of Mo in interphase precipitates and its coarsening behavior is revisited. It is found that (Ti, Mo)C precipitates instead of TiC are formed in the Mo-containing alloys, and the average site fraction of Mo in (Ti, Mo)C is almost independent of the bulk Mo content. Moreover, the number density of interphase precipitates can be substantially enhanced by a minor addition of Mo, albeit it does not further rise with increasing the bulk Mo content. This is because the Mo fraction in (Ti, Mo)C rather than the bulk Mo content governs the driving force for precipitation nucleation and the interfacial energy of the (Ti, Mo)C/α and (Ti, Mo)C/γ interfaces. In addition to the reduced interfacial energy, decrease of Ti trans-interface diffusivity has been identified as another key reason for the enhanced carbide coarsening resistance in Mo-containing alloys.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Novel Aerospace Material
Studies on Bis(imido) molybdenum complexes containing unsaturated hydrocarbon ligands
No full textThis thesis describes the synthesis and characterisation of molybdenum bis(imido) complexes containing unsaturated hydrocarbon ligands. A principal objective of the work was to examine the effect of various imido substituents on the coordination number of the complex and the orientations adopted by olefin and acetylene ligands. Chapter One highlights areas of transition metal chemistry relevant to the thesis, with particular emphasis on the psuedo-isolobal analogy between cyclopentadienyl and imido ligands, A convenient one-pot synthesis of molybdenum bis(imido) complexes of the type Mo(NR)(NR')Cl(_2).DME (R=R'=l-adamantyl, 2-t- BUC(_6)H(_4); R=2,6-i-Pr(_2)C(_6)H(_3), R'=t-Bu) is described in Chapter Two. Mo(N-l- adamantyl)(O)Cl(_2).DME has been synthesised, and its structure determined by single crystal X-ray diffraction.- The preparation of olefin complexes Mo(NR)(NR')(C(_2)H(_4))(PMe(_3))n (R=R'=l-adamantyl, n=l; R=R'=2-t-BuC(_6)H(_4), n=2; R=2,6-i-Pr(_2)C(_6)H(_3), R'=t- Bu, n=l) is outlined in Chapter Three. Structural information derived from NMR data has allowed comparison with metallocene-like olefin adducts. Chapter Four describes the synthesis of complexes containing σ-bound phenyl ligands (Mo(NR)(NR')(σ-C(_6)H(_5))(PMe(_3)) (R=R'=l-adamantyl, 2-t-BuC(_6)H(_4); R=2,6-i-Pr(_2)C(_6)H(_3), R'=t-Bu)) as potential precursors to benzyne complexes. Chapter Five describes the preparation of diphenylacetylene complexes Mo(NR)(NR')(PhC=CPh)(PMe(_3)), structural information derived from NMR data allows comparison with previously known metallocene-like acetylene complexes. Full experimental details for Chapters Two to Five are given in Chapter Six
Avatars of the author in Mo Yan's novels
No full textL’écrivain chinois Mo Yan a mis en scène dans son œuvre romanesque des avatars de l’auteur, identifiés à lui par le nom dans deux romans et par le rôle de créateur du récit dans plusieurs récits. Ces représentants ne sauraient être identifiés à l’auteur empirique, mais peuvent être interprétés à l’aune de ce que représente pour nous l’auteur, au sens large, ou dans une visée individuelle, lorsque nous analysons leur caractérisation en fonction d’autres textes, fictifs ou référentiels, construisant la figure biographique, théorique et fantasmatique de l’auteur. Outre qu’elle joue sur l’aporie de sa présence dans la fiction, cette représentation métafictionnelle a des fonctions diverses. Dans Le Pays de l’alcool, elle souligne l’allégorie tout en déjouant la censure ; dans La Dure Loi du karma, elle brosse un portrait comique du romancier, reflétant ses différents rôles pour le lecteur et la société. La suite de l’étude porte sur des narrateurs révélant un statut de créateur du récit, de sorte qu’ils provoquent une distanciation et un doute sur leur situation diégétique, en les associant à une tendance métafictionnelle présente dans l’œuvre de Mo Yan depuis son premier roman long, Le Clan du sorgho rouge, où elle est l’effet d’un narrateur omniscient et présent dans l’univers de la fiction. Ces figures d’autorité thématisent l’imagination à l’œuvre, tout en signalant l’altérité de la figure de l’auteur que le lecteur infère de ses indices supposés. Elles représentent l’auteur en une logique non référentielle, comme produit d’un ensemble mouvant d’hypothèses, issues d’une interprétation des récits comme éléments constitutifs de l’œuvre.In his fictional works, Chinese novelist Mo Yan created avatars of the author, who are either identified by their name such as the characters Mo Yan in The Republic of Wine and in Life and Death Are Wearing Me Out or by a creative role they reveal, in other narratives. Both doubles, Mo Yan’s fictional homonyms, cannot be considered as the empirical author, and yet may be interpreted in the light of what the author means to us, whether in a broad or individual sense, when their characteristics are confronted with the biographical, theoretical and fantasmatic figure of Mo Yan which other texts create. Drawing attention to the aporetical presence of the author in a universe he created, metafictional author representations have various functions. In The Republic of Wine, it enlights the allegorical value of the novel and, to the real author, is a means to deter censorship. In Life and Death Are Wearing Me Out, Mo Yan is a parody of a novelist, where the role he plays for the reader and in society appear in a nutshell. Next, the sign of the author is to be extended to other narrators who reveal, more or less explicitly, that they create the narrative, thus inducing readers to suspend belief and reconsider their diegetic posture. Beginning with his first long novel Red Sorghum, metafiction has been an obsessive tendency in Mo Yan’s novels, making imagination a theme of the novel while suggesting the figure of the author a reader infers from the text is but a shifting body of hypotheses, which envision narratives a part of the whole works that make the author
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