Communication in data-parallel applications often involves a collection of parallel flows. Traditional techniques to optimize flow-level metrics do not perform well in optimizing such collections, because the network is largely agnostic to application-level requirements. The recently proposed coflow abstraction bridges this gap and creates new opportunities for network scheduling. In this paper, we address inter-coflow scheduling for two different objectives: decreasing communication time of data-intensive jobs and guaranteeing predictable communication time. We introduce the concurrent open shop scheduling with coupled resources problem, analyze its complexity, and propose effective heuristics to optimize either objective. We present Varys, a system that enables data-intensive frameworks to use coflows and the proposed algorithms while maintaining high network utilization and guaranteeing starvation freedom. EC2 deployments and trace-driven simulations show that communication stages complete up to 3.16X faster on average and up to 2X more coflows meet their deadlines using Varys in comparison to per-flow mechanisms. Moreover, Varys outperforms non-preemptive coflow schedulers by more than 5X.
A novel family of functionalized styrenic copolymers that are susceptible to a base-catalyzed β-elimination reaction is reported. The reactive copolymers, poly-{(2-phenyl-2-cyanoethoxycarbonyloxystyrene)-co-(4-hydroxystyrene)}, are prepared by chemical modification of poly(4-hydroxystyrene) using 2-phenyl-2-cyanoethyl chloroformate. A photoresist material consisting of the copolymer and bis[[(2-nitrobenzyl)-oxy] carbonyl]-4,4′-trimethylenedipiperidine used as an amine photogenerator affords positive tone images by UV irradiation. The effect of copolymer structure and composition on imaging, thermal stability, and the ease of β-elimination reaction is discussed. © 1997 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 35: 3543–3552 1997
Our direct DFT decomposition of CO frequency shifts updates the paradigm for metal carbonyl binding.
A pesquisa socio-histórica sobre o corpo – sua configuração social, usos culturais e alterações físicas – passou por um crescimento sem precedentes nas duas últimas décadas, como demonstrado pela produção extraordinária de monografias historiográficas, tratados filosóficos, investigações antropológicas e estudos variados inspirados pelo feminismo, ou interessados em sexualidade, e os incontáveis números especiais de revistas que vão da literatura à psiquiatria, sem falar do lançamento, emblemático desse florescimento que torna-se tendência, do periódico inglês Body & Society que tem como obetivo agir como catalizador para a aplicação de teorias pós-estruturalistas e pós-modernas à esse objeto recentemente reabilitado e reconduzido ao centro das ciências sociais e humanas. Mas, ainda assim, essa profusão de trabalhos em múltiplas áreas apresenta uma característica notável e paradoxal que é esconder da vista corpos “verdadeiramente existentes” através da sua substituição por um corpo quase completamente virtual formado por signos, portador de códigos, e receptáculo passivo (ou recalcitrante) de forças sociais consideradas externas a ele, em resumo, um corpo mais ou menos reduzido ao nível de outro texto sujeito a uma tratamento essencialmente hermenêutico.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTrialkoxysiloxy complexes of nickel. Molecular structures of Na3(.mu.3-I){Ni[.mu.3-OSi(O-tert-Bu)3]3I}.cntdot.0.5THF.cntdot.0.5C5H12 and {(.eta.3-C3H5)Ni[.mu.2-OSi(O-tert-Bu)3]}2Anne K. McMullen, T. Don Tilley, Arnold L. Rheingold, and Steven J. GeibCite this: Inorg. Chem. 1990, 29, 12, 2228–2232Publication Date (Print):June 1, 1990Publication History Published online1 May 2002Published inissue 1 June 1990https://pubs.acs.org/doi/10.1021/ic00337a010https://doi.org/10.1021/ic00337a010research-articleACS PublicationsRequest reuse permissionsArticle Views154Altmetric-Citations27LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-AlertscloseSupporting Info (1)»Supporting Information Supporting Information Get e-Alerts
We describe the first results from a program of multi-wavelength monitoring of symbiotic binary stars in outburst. The prototypical symbiotic star Z Andromedae was observed extensively at radio, optical, far-UV, and X-ray wavelengths during its current (ongoing) outburst. These observations provide evidence for an initial obscuration or the source of ionizing radiation by an optically thick shell of material, outflow with velocities of 100s of km/s, plus collisional excitation and shock heating of the red-giant wind. In addition, the optical light curve reveals variability on time scales as short as days on both the rise to and decline from optical maximum.
Previous research has associated the development of social phobia with parental rearing practices, learning influences such as conditioning, vicarious transmission and verbal acquisition, and the individual's own response to social situations. The present study aimed to further investigate these possible antecedents of social phobia. A Learning History Questionnaire (LHQ) was completed by patients with social phobia ( n =55), patients with posttraumatic stress disorder (PTSD; n =30), and non-patient controls ( n =30). The LHQ focused on events that occurred before the age of 14 (the median age of onset for social phobia). The results indicated the importance of parental rearing practices such as not actively encouraging participation in social situations and emotional coldness. Difficulties with peer group were highlighted as important contributors to conditioning experiences. Individual response factors, especially post-event rumination, are potentially associated with the development of social phobia. Four of the 12 significant variables were unique to the social phobia group when the results from the PTSD group were taken into account. Further research is required to clarify the extent to which the environmental factors assessed in this study specifically contribute to the development of social phobia or to the development of anxiety more generally.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
