7,978 research outputs found
Stakeholder engagement as a facilitator of organizational learning
This paper examines the relationship between stakeholder engagement and competence building. Following the dual perspective of the firm, which indicated that managers deal with both transactions and competences concurrently, we argue that stakeholder interactions also concern both transaction cost reduction and value creation. Based on a review of the extant literature, we incorporated a micro-macro connection between organizational learning and competence building. Further to this, we developed a conceptual framework by linking stakeholder engagement and organizational learning. This framework demonstrates that stakeholder relations may have significant effects on organizational learning and thus stakeholder engagement can play the role of facilitator in building firm competences
CU2CL: A CUDA-to-OpenCL Translator for Multi- and Many-core Architectures
The use of graphics processing units (GPUs) in
high-performance parallel computing continues to become more
prevalent, often as part of a heterogeneous system. For years,
CUDA has been the de facto programming environment for
nearly all general-purpose GPU (GPGPU) applications. In spite
of this, the framework is available only on NVIDIA GPUs,
traditionally requiring reimplementation in other frameworks
in order to utilize additional multi- or many-core devices.
On the other hand, OpenCL provides an open and vendorneutral
programming environment and runtime system. With
implementations available for CPUs, GPUs, and other types of
accelerators, OpenCL therefore holds the promise of a “write
once, run anywhere” ecosystem for heterogeneous computing.
Given the many similarities between CUDA and OpenCL,
manually porting a CUDA application to OpenCL is typically
straightforward, albeit tedious and error-prone. In response
to this issue, we created CU2CL, an automated CUDA-to-
OpenCL source-to-source translator that possesses a novel design
and clever reuse of the Clang compiler framework. Currently,
the CU2CL translator covers the primary constructs found in
CUDA runtime API, and we have successfully translated many
applications from the CUDA SDK and Rodinia benchmark suite.
The performance of our automatically translated applications via
CU2CL is on par with their manually ported countparts
Linking neutrino oscillations to the nucleosynthesis of elements
Neutrino interactions with matter play an important role in determining the
nucleosynthesis outcome in explosive astrophysical environments such as
core-collapse supernovae or mergers of compact objects. In this article, we
first discuss our recent work on the importance of studying the time evolution
of collective neutrino oscillations among active flavors in determining their
effects on nucleosynthesis. We then consider the possible active-sterile
neutrino mixing and demonstrate the need of a consistent approach to evolve
neutrino flavor oscillations, matter composition, and the hydrodynamics when
flavor oscillations can happen very deep inside the supernovae.Comment: 6 pages, 2 figures, OMEG 2015 conference proceedings, to appear in
EPJ WOC proceeding
Radioactivity and thermalization in the ejecta of compact object mergers and their impact on kilonova light curves
One of the most promising electromagnetic signatures of compact object
mergers are kilonovae: approximately isotropic radioactively-powered transients
that peak days to weeks post-merger. Key uncertainties in modeling kilonovae
include the emission profiles of the radioactive decay products---non-thermal
beta- and alpha-particles, fission fragments, and gamma-rays---and the
efficiency with which they deposit their energy in the ejecta. The total
radioactive energy and the efficiency of its thermalization sets the luminosity
budget and is therefore necessary for predicting kilonova light curves. We
outline the uncertainties in r-process decay, describe the physical processes
by which the energy of the decay products is absorbed in the ejecta, and
present time-dependent thermalization efficiencies for each particle type. We
determine the net heating efficiency and explore its dependence on r-process
yields---in particular, the production of translead nuclei that undergo
alpha-decay---and on the ejecta's mass, velocity, composition, and magnetic
field configuration. We incorporate our results into new time-dependent,
multi-wavelength radiation transport simulations, and calculate updated
predictions of kilonova light curves. Thermalization has a substantial effect
on kilonova photometry, reducing the luminosity by a factor of roughly 2 at
peak, and by an order of magnitude or more at later times (15 days or more
after explosion). We present simple analytic fits to time-dependent net
thermalization efficiencies, which can easily be used to improve light curve
models. We briefly revisit the putative kilonova that accompanied gamma ray
burst 130603B, and offer new estimates of the mass ejected in that event. We
find that later-time kilonova light curves can be significantly impacted by
alpha-decay from translead isotopes; data at these times may therefore be
diagnostic of ejecta abundances.Comment: Submitted to ApJ; comments welcom
Robust algorithm for calibration of robotic manipulator model
The paper focuses on the robust identification of geometrical and elastostatic parameters of robotic manipulator. The main attention is paid to the efficiency improvement of the identification algorithm. To increase the identification accuracy, it is proposed to apply the weighted least square technique that employs a new algorithm for assigning of the weighting coefficients. The latter allows taking into account variation of the measurement system precision in different directions and throughout the robot workspace. The advantages of the proposed approach are illustrated by an application example that deals with the elasto-static calibration of industrial robot.AN
Importance of second-order piezoelectric effects in zincblende semiconductors
We show that the piezoelectric effect that describes the emergence of an
electric field in response to a crystal deformation in III-V semiconductors
such as GaAs and InAs has strong contributions from second-order effects that
have been neglected so far. We calculate the second-order piezoelectric tensors
using density functional theory and obtain the piezoelectric field for
[111]-oriented InGaAs quantum wells of realistic dimensions and
concentration . We find that the linear and the quadratic piezoelectric
coefficients have the opposite effect on the field, and for large strains the
quadratic terms even dominate. Thus, the piezoelectric field turns out to be a
rare example of a physical quantity for which the first- and second-order
contributions are of comparable magnitude.Comment: 4 pages, 3 figures, Submitted to Phys. Rev. Let
- …