Sparse approximate inverse preconditioners on high performance GPU platforms

Simulation with models based on partial differential equations often requires the solution of (sequences of) large and sparse algebraic linear systems. In multidimensional domains, preconditioned Krylov iterative solvers are often appropriate for these duties. Therefore, the search for efficient preconditioners for Krylov subspace methods is a crucial theme. Recent developments, especially in computing hardware, have renewed the interest in approximate inverse preconditioners in factorized form, because their application during the solution process can be more efficient. We present here some experiences focused on the approximate inverse preconditioners proposed by Benzi and Tůma from 1996 and the sparsification and inversion proposed by van Duin in 1999. Computational costs, reorderings and implementation issues are considered both on conventional and innovative computing architectures like Graphics Programming Units (GPUs)

Redefining managerial effectiveness in a multilevel organization : a structurationist account

Many organization theories consist of an interpretation frame and an idea about the ideal equilibrium state. This article explains how the equilibrium concept is used in four organization theories: the theories of Fayol, Mintzberg, Morgan, and Volberda. Equilibrium can be defined as balance, fit or requisite variety. Equilibrium is related to observables dependent on the definition of organization as work organization, formal organization or artifact organization. Equilibrium can be explicitly related to performance in the theory used, enabling cross-sectional research. The discussed theories can be mapped on a state space model in a way that clarifies the equilibrium concept, namely a mu-space (Fayol and Morgan), or a gamma-space (Mintzberg and Volberda). 1 Prof.dr. Henk W.M. Gazendam is professor of Information Systems in the Public Sector at the Faculty of Public Administration at Twente University and associate professor of Information Strategy at the Faculty of Management and Organization at Groningen University (P.O.Box 800, NL-9700-AV Groningen, The Netherlands, tel +31-50-3637078, email [email protected]). 2 Contribution to the Computational and Mathematical Organization Theory Workshop, May 3 and 4, 1996, Washington Hilton & Towers. 3 The author wishes to thank Vincent Homburg for his valuable comments.

A Multiscale Pyramid Transform for Graph Signals

Multiscale transforms designed to process analog and discrete-time signals and images cannot be directly applied to analyze high-dimensional data residing on the vertices of a weighted graph, as they do not capture the intrinsic geometric structure of the underlying graph data domain. In this paper, we adapt the Laplacian pyramid transform for signals on Euclidean domains so that it can be used to analyze high-dimensional data residing on the vertices of a weighted graph. Our approach is to study existing methods and develop new methods for the four fundamental operations of graph downsampling, graph reduction, and filtering and interpolation of signals on graphs. Equipped with appropriate notions of these operations, we leverage the basic multiscale constructs and intuitions from classical signal processing to generate a transform that yields both a multiresolution of graphs and an associated multiresolution of a graph signal on the underlying sequence of graphs.Comment: 16 pages, 13 figure

Pressed into Party Support? : Media Influence on Partisan Attitudes during the 2005 UK General Election Campaign

Peer reviewedPublisher PD

Post heat treatment effects on double layer metal structures for VLSI applications

The realization of high yield double layer metal systems using wet chemistry processes and the ability to extend yields beyond that attainable with wet chemistry by means of post sintering processes at temperatures below 500 C for potential applications in very large scale integration structures were studied. Yields in excess of 98% and average total contact resistance of less than 150 ohms and 200 ohms were realized for a series of 560 vias of 0.5 X 0.5 mils and 0.2 X 0.2 mils in size, respectively

Cultural differences in intimacy: The influence of gender-role ideology and individualism-collectivism

Two studies examined emotional intimacy in European Canadian and Chinese Canadian dating relationships. Cultural differences in gender-role ideology and individualism–collectivism were hypothesized to differentially contribute to selfdisclosure and responsiveness, and in turn, intimacy. Study 1 revealed that Chinese Canadians’ lower intimacy relative to European Canadians was mediated by their greater gender-role traditionalism but not by their individualism or collectivism. Study 2 further linked greater gender-role traditionalism to lower self-disclosure, and in turn, lower intimacy. Results also revealed that Chinese Canadians’ lower intimacy mediated their lower relationship satisfaction and higher rate of relationship termination in Study 1, but that Chinese Canadians were not any more likely to terminate their relationships in Study 2

The Conditional Electoral Connection in the European Parliament

This paper introduces a model of the electoral connection in the European Parliament. Emphasizing the problem of common agency – wherein agents are beholden to multiple principals who cannot coordinate – it assumes that national parties, European party groups, and voters are “latent principals” that differentially constrain members of the European Parliament (MEPs). The model proposes that the degree to which each of these principals constrain MEPs depends upon signals that MEPs receive from the national political arena about their electoral vulnerability. Re-election seeking MEPs will in turn cultivate closer connections with the principal whose support is most important for reducing electoral vulnerability. Drawing on the second-order election model, signals about MEP vulnerability are measured as a national party‟s success in the most recent national election, given the party‟s average size, governing status, and time remaining until the European election. The model predicts three broad outcomes. First, MEPs from large or governing parties will generally be more vulnerable as their party label suffers in European elections. Expecting losses, they should cultivate closer connections to their constituents by emphasizing personal record rather than party affiliation. Second, MEPs from small or opposition parties will generally be less vulnerable as their party label is more successful in European elections. Expecting gains, these MEPs will seek to appeal to their party leaders in order to secure the safest (often only the top) place on the electoral list. Finally, the model predicts that systemic-level attributes such as voters‟ right to re-order the ballot should contribute to variation in the first two outcomes. The model‟s propositions are tested empirically with qualitative and quantitative evidence from 30 interviews with MEPs in 2008 and an original dataset of MEPs‟ non-roll-call position taking in plenary sessions during the 6th European Parliament term

Securing the Right Skills: A Longitudinal Assessment of College Students’ Writing and Public Speaking Self-Efficacy

This research investigated the developmental patterns of students’ writing and public-speaking self-efficacy throughout their experience in the basic communication course (BCC). Questions were posed regarding (a) whether students grew in their reported writing and public speaking self-efficacy over two semesters, (b) whether growth differed based on biological sex, and (c) whether affinity and apprehension (as sources of performance self-efficacy) played a role in student growth. Two multilevel models revealed significant differences in students’ initial status and rate of growth for each outcome. Specifically, sex, affinity, and apprehension influenced students’ starting positions in the course, while only apprehension had a significant impact on growth. Analyses also revealed a contextual effect of the winter break on growth patterns. The results paint an important picture of the factors influencing students’ personal development in the BCC, while also highlighting the use of multilevel modeling as a potential and relevant tool for contextualizing communicative development over time