6,025 research outputs found
Provenance Views for Module Privacy
Scientific workflow systems increasingly store provenance information about
the module executions used to produce a data item, as well as the parameter
settings and intermediate data items passed between module executions. However,
authors/owners of workflows may wish to keep some of this information
confidential. In particular, a module may be proprietary, and users should not
be able to infer its behavior by seeing mappings between all data inputs and
outputs. The problem we address in this paper is the following: Given a
workflow, abstractly modeled by a relation R, a privacy requirement \Gamma and
costs associated with data. The owner of the workflow decides which data
(attributes) to hide, and provides the user with a view R' which is the
projection of R over attributes which have not been hidden. The goal is to
minimize the cost of hidden data while guaranteeing that individual modules are
\Gamma -private. We call this the "secureview" problem. We formally define the
problem, study its complexity, and offer algorithmic solutions
Phase transition in the massive Gross-Neveu model in toroidal topologies
We use methods of quantum field theory in toroidal topologies to study the
-component -dimensional massive Gross-Neveu model, at zero and finite
temperature, with compactified spatial coordinates. We discuss the behavior of
the large- coupling constant (), investigating its dependence on the
compactification length () and the temperature (). For all values of the
fixed coupling constant (), we find an asymptotic-freedom type of
behavior, with as and/or . At T=0, and for
(the strong coupling regime), we show that,
starting in the region of asymptotic freedom and increasing , a divergence
of appears at a finite value of , signaling the existence of a phase
transition with the system getting spatially confined. Such a spatial
confinement is destroyed by raising the temperature. The confining length,
, and the deconfining temperature, , are determined
as functions of and the mass () of the fermions, in the case of
. Taking as the constituent quark mass (), the
results obtained are of the same order of magnitude as the diameter () and the estimated deconfining temperature () of
hadrons.Comment: 14 pages, 10 figures, 1 table, to appear in Phys. Rev.
Complex-based analysis of dysregulated cellular processes in cancer
Background: Differential expression analysis of (individual) genes is often
used to study their roles in diseases. However, diseases such as cancer are a
result of the combined effect of multiple genes. Gene products such as proteins
seldom act in isolation, but instead constitute stable multi-protein complexes
performing dedicated functions. Therefore, complexes aggregate the effect of
individual genes (proteins) and can be used to gain a better understanding of
cancer mechanisms. Here, we observe that complexes show considerable changes in
their expression, in turn directed by the concerted action of transcription
factors (TFs), across cancer conditions. We seek to gain novel insights into
cancer mechanisms through a systematic analysis of complexes and their
transcriptional regulation.
Results: We integrated large-scale protein-interaction (PPI) and
gene-expression datasets to identify complexes that exhibit significant changes
in their expression across different conditions in cancer. We devised a
log-linear model to relate these changes to the differential regulation of
complexes by TFs. The application of our model on two case studies involving
pancreatic and familial breast tumour conditions revealed: (i) complexes in
core cellular processes, especially those responsible for maintaining genome
stability and cell proliferation (e.g. DNA damage repair and cell cycle) show
considerable changes in expression; (ii) these changes include decrease and
countering increase for different sets of complexes indicative of compensatory
mechanisms coming into play in tumours; and (iii) TFs work in cooperative and
counteractive ways to regulate these mechanisms. Such aberrant complexes and
their regulating TFs play vital roles in the initiation and progression of
cancer.Comment: 22 pages, BMC Systems Biolog
A State-Wide Effort to Promote Best Practices in Industrial Energy Efficiency in Missouri [abstract]
Only abstract of poster available.Track III: Energy InfrastructureMissouri Industrial Assessment Center is funded by the U.S. Department of Energy's IAC program to provide services in energy efficiency for industries in the state. The aim is to promote best practices in energy efficiency, reusable energy, waste reduction and productivity through integration of activities involving the University, the state agencies, the University of Missouri Extension, the Manufacturing Extension Partnership program, the state-wide and local utilities and industrial associations. The energy audit and productivity assessment is offered to qualified small- to medium-sized manufacturing companies.
The center carries out activities in research, education and outreach to:
• Provide students with practical experience and training in energy engineering, by: i) providing hands-on training of industrial and productivity assessment skills; ii) establishing online materials aimed at increasing awareness to industrial energy efficiency and conservation, waste reduction, renewable energy and productivity.
• Help small to medium-sized manufacturers improve energy efficiency, minimize waste and improve productivity, through: i) conducting energy audits for eligible industrial organizations in the state of Missouri and surrounding areas; ii) providing guidance to industrial organizations following the energy audits to meet or exceed the performance goal; iii) promoting interdisciplinary assessment teams of faculty, students and state energy managers and engineers.
• Integrate the IAC program into other areas to create innovative approaches to delivering services, by: i) promoting best practice in industry by conducting outreach seminars and workshops in the state; ii) working with the center's partners to establish Missouri IAC as the center of resources and services for industries in the state and the surrounding areas; iii) utilizing the synergy resulting from its newt work of partnerships to offer and deliver a more comprehensive range services to small and medium manufacturers.
Up to date, the center's services have covered many parts across the state of Missouri
Localised melorheostosis
Melorheostosis is a sclerosing bone dysplasia of unknown aetiology. Diagnosis is mainly based on a combination of clinical and imaging studies. The classical dripping candle wax picture on plain radiograph is diagnostic. We report a case of localized melorheostosis of a 14 year old boy on daily analgesics for two years for pain relief. Radiographs showed endosteal bone formation like dripping candle wax. Biopsy and decompression of the hyperostosis was done. However biopsy did not relieve his symptoms. Based on literature survey he was given a single infusion of zoledronic acid. This gave dramatic relief in pain
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