4,479 research outputs found
Optimisation of supply chain management in Spotless Catering
Global warming is a reality. Organisations realise their corporate responsibility to conduct their business with the 'future' in mind. Sustainability is having a green conscience and ensuring the steps you take today do not have a negative impact on the future. Green Human Resources Management is to promote the sustainable use of resources within business organisations. The aim of this research is to provide organisations with a Green Human Resource Management Strategy (GHRM). A qualitative approach was followed, and five participants interviewed. The researcher followed this approach to gain an in-depth understanding of business eco-friendly practices, to ascertain if they utilise HR to drive “green” in the organisation and engage employees. The study found that most organisations have implemented some eco-friendly practice and know the value of becoming a 'green' employer. However, the researcher identified a significant gap in that organisations are not aware of or lack the knowledge of how to utilise HR practices to get staff engaged in green policies and procedures. The researcher will strive to come up with various ideas and recommendation to the business on how they can utilise their HR practices to go green and engage their staff
Usability Inspection Report of NCSTRL
An evaluation report of the www.ncstrl.org site outlining usability problems and solutions to these problems
Supersolid He Likely Has Nearly Isotropic Superflow
We extend previous calculations of the zero temperature superfluid fraction
(SFF) {\it vs} localization, from the fcc lattice to the experimentally
realized (for solid He) hcp and bcc lattices. The superfluid velocity is
assumed to be a one-body function, and dependent only on the local density,
taken to be a sum over sites of gaussians of width . Localization is
defined as , with the nearest-neighbor distance. As expected, for
fcc and bcc lattices the superfluid density tensor is proportional to the unit
tensor. To numerical accuracy of three-places (but no more), the hcp superfluid
density tensor is proportional to the unit tensor. This implies that a larger
spread in data on , if measured on pure crystals, is unlikely to be due to
crystal orientation. In addition, to three decimal places (but no more) the
curves of {\it vs} are the same for both the hcp and fcc
cases. An expected value for the localization gives an in reasonable
agreement with experiment. The bcc lattice has a similar curve of {\it
vs} , but is generally smaller because the lattice is more dilute.Comment: 9 pages, 1 figure, 3 table
Thumbs up? Sentiment Classification using Machine Learning Techniques
We consider the problem of classifying documents not by topic, but by overall
sentiment, e.g., determining whether a review is positive or negative. Using
movie reviews as data, we find that standard machine learning techniques
definitively outperform human-produced baselines. However, the three machine
learning methods we employed (Naive Bayes, maximum entropy classification, and
support vector machines) do not perform as well on sentiment classification as
on traditional topic-based categorization. We conclude by examining factors
that make the sentiment classification problem more challenging.Comment: To appear in EMNLP-200
Navier-Stokes calculations of transonic flows past cavities
A computational investigation of subsonic and transonic flows past 3-D deep transitional cavities is presented. Computational simulations of these self-induced oscillatory flows were generated through time-accurate solutions of the Reynolds averaged full Navier-Stokes equations, using the explicit MacCormack scheme. The Reynolds stresses were included through the Baldwin-Lomax algebraic turbulence model with certain modifications. Two cases were computed to demonstrate the capability of the numerical scheme in modeling the complex 3-D flow features inside a cavity. The results from an experimental investigation were used not only to benchmark the computations, but also to widen the database used for the discussions and conclusions. The computational results include instantaneous and time averaged flow properties everywhere in the computational zone. Time series analyses were performed for the instantaneous pressure values on the cavity floor. The features of deep and transitional cavity flows, and the effect of the sidewall on the cavity flow flowfield are illustrated through computational graphics
PIETOOLS: A Matlab Toolbox for Manipulation and Optimization of Partial Integral Operators
In this paper, we present PIETOOLS, a MATLAB toolbox for the construction and
handling of Partial Integral (PI) operators. The toolbox introduces a new class
of MATLAB object, opvar, for which standard MATLAB matrix operation syntax
(e.g. +, *, ' e tc.) is defined. PI operators are a generalization of bounded
linear operators on infinite-dimensional spaces that form a *-subalgebra with
two binary operations (addition and composition) on the space RxL2. These
operators frequently appear in analysis and control of infinite-dimensional
systems such as Partial Differential equations (PDE) and Time-delay systems
(TDS). Furthermore, PIETOOLS can: declare opvar decision variables, add
operator positivity constraints, declare an objective function, and solve the
resulting optimization problem using a syntax similar to the sdpvar class in
YALMIP. Use of the resulting Linear Operator Inequalities (LOIs) are
demonstrated on several examples, including stability analysis of a PDE,
bounding operator norms, and verifying integral inequalities. The result is
that PIETOOLS, packaged with SOSTOOLS and MULTIPOLY, offers a scalable,
user-friendly and computationally efficient toolbox for parsing, performing
algebraic operations, setting up and solving convex optimization problems on PI
operators
On the geometric structure of fMRI searchlight-based information maps
Information mapping is a popular application of Multivoxel Pattern Analysis
(MVPA) to fMRI. Information maps are constructed using the so called
searchlight method, where the spherical multivoxel neighborhood of every voxel
(i.e., a searchlight) in the brain is evaluated for the presence of
task-relevant response patterns. Despite their widespread use, information maps
present several challenges for interpretation. One such challenge has to do
with inferring the size and shape of a multivoxel pattern from its signature on
the information map. To address this issue, we formally examined the geometric
basis of this mapping relationship. Based on geometric considerations, we show
how and why small patterns (i.e., having smaller spatial extents) can produce a
larger signature on the information map as compared to large patterns,
independent of the size of the searchlight radius. Furthermore, we show that
the number of informative searchlights over the brain increase as a function of
searchlight radius, even in the complete absence of any multivariate response
patterns. These properties are unrelated to the statistical capabilities of the
pattern-analysis algorithms used but are obligatory geometric properties
arising from using the searchlight procedure.Comment: 15 pages, 7 figure
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