Safe self-scheduling: A parallel loop scheduling scheme for shared-memory multiprocessors

The article of record as published may be found at https://doi.org/10.1007/BF02577870In this paper we present Safe Self-Scheduling (SSS), a new scheduling scheme that schedules parallel loops with variable length iteration execution times not known at compile time. The scheme assumes a shared memory space. SSS combines static scheduling with dynamic scheduling and draws favorable advantages from each. First, it reduces the dynamic scheduling overhead by statistically scheduling a major portion of loop iterations. Second, the workload is balanced with simple and efficient self-scheduling scheme by applying a new measure, the smallest critical chore size. Experimental results comparing SSS with other scheduling schemes indicate that SSS surpasses other scheduling schemes. In the experiment on Gauss-Jordan, an application that is suitable for static scheduling schemes, SSS is the only self-scheduling scheme that outperforms the static scheduling scheme. This indicates that SSS achieves a balanced workload with a very small amount of overhead.USDO

When High Touch Meets Low Tech: Knowledge Management in a Small Enterprise

In this article, we propose an analytical framework for investigating how control of knowledge and knowledge workers is achieved in a translation agency. The organizational size and an organizational logic of self-management were found to drive control mechanisms into a minimalist style of joint management. On the one hand, the translators managed themselves through (a) the buy-in of an open and sharing culture and a new psychological contract, (b) information from the appraisal results, and (c) conversation and communication with other experts. On the other hand, the managers manage by employing (a) a strategy centered on the dictionary and directory elements of an open and sharing culture, (b) minimalist interventions to induce and structure spontaneous communication, and (c) freelancers to complement expertise within organizational boundaries. Our analysis establishes a prototype for managing individualistic knowledge work in small organizations. Implications of these findings include a configurational approach to KM research, a shift from the concern of rent appropriation to that of rent sharing, and viewing organizations as the context covered with communication channels that craft, groom and enable communication, conversation and mutual learning. Available at: https://aisel.aisnet.org/pajais/vol1/iss2/3

Spanning Knowledge Holes In IS Projects

Prior studies have demonstrated the importance of bridging structural holes across functional groups in IS projects. In this study, we argue that bridging structural holes is necessary but insufficient for ensuring project success. An additional requirement is that knowledge holes across functional groups need to be bridged to enable effective problem-solving across functional groups. We propose and empirically study the concept of knowledge holes in a case study of an ERP upgrade. Our findings suggest that complementary to the concept of structural holes, the concept of knowledge holes is useful for explaining different project outcomes. Our findings also demonstrate methods for bridging knowledge holes. Contributions of this study are manifold

Obtaining Top Management Support in IT Projects: A Case Study

Research has argued that one reason for IT project failure is the lack of top management support. However, obtaining top management support is often considered outside the IT project team’s locus of control. Our research demonstrates that top management support can be obtained through continuous engagement. Also, a failure to engage can decrease top management support. We reveal an engagement strategy that starts with small favor requests followed by increasingly onerous favors rewarded by small concessions. This is demonstrated through a case study of the support of three division heads and their corresponding divisions in the implementation of an enterprise system. In case 1, an indifferent division head withdrew support after a lack of IT engagement. In case 2, a hostile division head became an advocate of the system after continuous IT engagement. Finally, in case 3, a supportive division head became more supportive as a result of continuous engagement by IT

Co-production of synfuels and electricity from coal + biomass with zero net carbon emissions: An Illinois case study

Abstract Energy, carbon, and economic performance are estimated for facilities co-producing Fischer–Tropsch Liquid (FTL) fuels and electricity from a co-feed of biomass and coal in Illinois, with capture and storage of by-product CO 2 . The estimates include detailed models of supply systems for corn stover or mixed prairie grasses and of feedstock conversion facilities. The Illinois results are extrapolated to estimate the potential FTL production in 23 states

Quark Effects in the Gluon Condensate Contribution to the Scalar Glueball Correlation Function

One-loop quark contributions to the dimension-four gluon condensate term in the operator product expansion (OPE) of the scalar glueball correlation function are calculated in the MS-bar scheme in the chiral limit of $n_f$ quark flavours. The presence of quark effects is shown not to alter the cancellation of infrared (IR) singularities in the gluon condensate OPE coefficients. The dimension-four gluonic condensate term represents the leading power corrections to the scalar glueball correlator and, therein, the one-loop logarithmic contributions provide the most important condensate contribution to those QCD sum-rules independent of the low-energy theorem (the subtracted sum-rules).Comment: latex2e, 6 pages, 7 figures embedded in latex fil

Deflection of coronal rays by remote CMEs: shock wave or magnetic pressure?

We analyze five events of the interaction of coronal mass ejections (CMEs) with the remote coronal rays located up to 90^\circ away from the CME as observed by the SOHO/LASCO C2 coronagraph. Using sequences of SOHO/LASCO C2 images, we estimate the kink propagation in the coronal rays during their interaction with the corresponding CMEs ranging from 180 to 920 km/s within the interval of radial distances form 3 R. to 6 R. . We conclude that all studied events do not correspond to the expected pattern of shock wave propagation in the corona. Coronal ray deflection can be interpreted as the influence of the magnetic field of a moving flux rope related to a CME. The motion of a large-scale flux rope away from the Sun creates changes in the structure of surrounding field lines, which are similar to the kink propagation along coronal rays. The retardation of the potential should be taken into account since the flux rope moves at high speed comparable with the Alfven speed.Comment: Accepted for Publication in Solar Physic

Geometry of Frictionless and Frictional Sphere Packings

We study static packings of frictionless and frictional spheres in three dimensions, obtained via molecular dynamics simulations, in which we vary particle hardness, friction coefficient, and coefficient of restitution. Although frictionless packings of hard-spheres are always isostatic (with six contacts) regardless of construction history and restitution coefficient, frictional packings achieve a multitude of hyperstatic packings that depend on system parameters and construction history. Instead of immediately dropping to four, the coordination number reduces smoothly from $z=6$ as the friction coefficient $\mu$ between two particles is increased.Comment: 6 pages, 9 figures, submitted to Phys. Rev.

Bio-pulsating architecture for object-based processing in next generation vision systems

Accepted versio

Instanton Effects on the Role of the Low-Energy Theorem for the Scalar Gluonic Correlation Function

Instanton contributions to the Laplace sum-rules for correlation functions of scalar gluonic currents are calculated. The role of the constant low-energy theorem term, whose substantial contribution is unique to the leading Laplace sum-rule $L_{-1}$, is shown to be diminished by instanton contributions, significantly increasing the resulting mass bounds for the ground state of scalar gluonium and improving compatibility with results from higher-weight sum-rules.Comment: latex2e, 12 pages, 10 encapsulated postscript figures. Revised version includes additional analysis, figures, and reference