3,267 research outputs found
Shaping Metrics for HEI Cultural Engagement - Knowledge Transfer
An application was submitted to the Arts and Humanities Research Council (AHRC) for support for a project that would identify and define activities deemed relevant to Knowledge Transfer (KT) - Cultural Engagement (CE), and propose appropriate means to evaluate them. It was acknowledged from the outset that efforts at agreeing “metrics” for the impact of such activities had been attempted before, albeit with limited success. (One such notable example has been lately provided by the Higher Education and Business Community Interaction Survey (HEBCIS) which has collected some data on social, community, and cultural engagement for some years; however, the robustness and consistency of the data for these purposes have often been questioned.
An Imaging Infrared (IIR) seeker using a microprogrammed processor
A recently developed Imaging Infrared Seeker uses a microprogrammed processor to perform gimbal servo control and system interface while performing the seeker functions of automatic target detection, acquisition, and tracking. The automatic detection mode requires up to 80% of the available capability of a high performance microprogrammed processor. Although system complexity was increased significantly, this approach can be cost effective when the basic computation capacity is already available
Shaping Metrics for HEI Cultural Engagement - Knowledge Transfer
An application was submitted to the Arts and Humanities Research Council (AHRC) for support for a project that would identify and define activities deemed relevant to Knowledge Transfer (KT) - Cultural Engagement (CE), and propose appropriate means to evaluate them. It was acknowledged from the outset that efforts at agreeing “metrics” for the impact of such activities had been attempted before, albeit with limited success. (One such notable example has been lately provided by the Higher Education and Business Community Interaction Survey (HEBCIS) which has collected some data on social, community, and cultural engagement for some years; however, the robustness and consistency of the data for these purposes have often been questioned.
Modelling financial markets by the multiplicative sequence of trades
We introduce the stochastic multiplicative point process modelling trading
activity of financial markets. Such a model system exhibits power-law spectral
density S(f) ~ 1/f**beta, scaled as power of frequency for various values of
beta between 0.5 and 2. Furthermore, we analyze the relation between the
power-law autocorrelations and the origin of the power-law probability
distribution of the trading activity. The model reproduces the spectral
properties of trading activity and explains the mechanism of power-law
distribution in real markets.Comment: 6 pages, 2 figure
Consumer-oriented Drug Information Service Needs Assessment
Federal legislation that has been introduced to amend the Social Security Act in order to provide for coverage of cognitive pharmacist services under the Medicare program in medically underserved communities. In the rural state of Arkansas this legislation would be well-received because a large portion of the state meets the criteria of a health professional shortage area. Considering the growing interest of using telecommunications as an alternative means of delivering healthcare services to medically underserved rural areas, a pharmacist-staffed consumer-oriented drug information service was explored. Over a 5-day period, 473 face-to-face consumer surveys were conducted in pharmacy and non-pharmacy settings in an urban cluster population center that serves the surrounding rural area. The survey was designed to determine whether or not consumers had a perceived need for a drug information service that was independent from and supplemental to services provided by their pharmacist. Results reveal that 71% of participants surveyed did not perceive a need for medication information that was supplemental to that provided by their pharmacist. When queried regarding the likelihood of using a drug information service if one was available their response was neutral, and they became less likely if a fee was associated with the service. While the results are not conclusive and cannot be generalized as to whether a consumer-oriented drug information service would contribute to improving patient care, the survey suggests that this telepharmacy service is not perceived as being needed by the public
SN 1997bs in M66: Another Extragalactic Eta Carinae Analog?
We report on SN 1997bs in NGC 3627 (M66), the first supernova discovered by
the Lick Observatory Supernova Search using the 0.75-m Katzman Automatic
Imaging Telescope (KAIT). Based on its early-time optical spectrum, SN 1997bs
was classified as Type IIn. However, from the BVRI light curves obtained by
KAIT early in the supernova's evolution, and F555W and F814W light curves
obtained from Hubble Space Telescope archival WFPC2 images at late times, we
question the identification of SN 1997bs as a bona fide supernova. We believe
that it is more likely a super-outburst of a very massive luminous blue
variable star, analogous to Eta Carinae, and similar to SN 1961V in NGC 1058
(Filippenko et al. 1995 [AJ, 110, 2261]) and SN 1954J (``Variable 12'') in NGC
2403 (Humphreys & Davidson 1994 [PASP, 106, 1025]). The progenitor may have
survived the outburst, since the SN is seen in early 1998 at m_F555W=23.4,
about 0.5 mag fainter than the progenitor identified by Van Dyk et al. (1999,
[AJ, 118, 2331]) in a pre-discovery image. Based on analysis of its environment
in the Hubble Space Telescope images, the progenitor was not in an H II region
or association of massive stars. The recent discovery of additional objects
with properties similar to those of SN 1997bs suggests that the heterogeneous
class of Type IIn supernovae consists in part of ``impostors.''Comment: 15 pages, 8 figures, to appear in the PASP (2000 Dec issue
A zeta function approach to the relation between the numbers of symmetry planes and axes of a polytope
A derivation of the Ces\`aro-Fedorov relation from the Selberg trace formula
on an orbifolded 2-sphere is elaborated and extended to higher dimensions using
the known heat-kernel coefficients for manifolds with piecewise-linear
boundaries. Several results are obtained that relate the coefficients, ,
in the Shephard-Todd polynomial to the geometry of the fundamental domain. For
the 3-sphere we show that is given by the ratio of the volume of the
fundamental tetrahedron to its Schl\"afli reciprocal.Comment: Plain TeX, 26 pages (eqn. (86) corrected
Multiplicative point process as a model of trading activity
Signals consisting of a sequence of pulses show that inherent origin of the
1/f noise is a Brownian fluctuation of the average interevent time between
subsequent pulses of the pulse sequence. In this paper we generalize the model
of interevent time to reproduce a variety of self-affine time series exhibiting
power spectral density S(f) scaling as a power of the frequency f. Furthermore,
we analyze the relation between the power-law correlations and the origin of
the power-law probability distribution of the signal intensity. We introduce a
stochastic multiplicative model for the time intervals between point events and
analyze the statistical properties of the signal analytically and numerically.
Such model system exhibits power-law spectral density S(f)~1/f**beta for
various values of beta, including beta=1/2, 1 and 3/2. Explicit expressions for
the power spectra in the low frequency limit and for the distribution density
of the interevent time are obtained. The counting statistics of the events is
analyzed analytically and numerically, as well. The specific interest of our
analysis is related with the financial markets, where long-range correlations
of price fluctuations largely depend on the number of transactions. We analyze
the spectral density and counting statistics of the number of transactions. The
model reproduces spectral properties of the real markets and explains the
mechanism of power-law distribution of trading activity. The study provides
evidence that the statistical properties of the financial markets are enclosed
in the statistics of the time interval between trades. A multiplicative point
process serves as a consistent model generating this statistics.Comment: 10 pages, 3 figure
High-throughput sequencing reveals a simple model of nucleosome energetics
We use nucleosome maps obtained by high-throughput sequencing to study
sequence specificity of intrinsic histone-DNA interactions. In contrast with
previous approaches, we employ an analogy between a classical one-dimensional
fluid of finite-size particles in an arbitrary external potential and arrays of
DNA-bound histone octamers. We derive an analytical solution to infer free
energies of nucleosome formation directly from nucleosome occupancies measured
in high-throughput experiments. The sequence-specific part of free energies is
then captured by fitting them to a sum of energies assigned to individual
nucleotide motifs. We have developed hierarchical models of increasing
complexity and spatial resolution, establishing that nucleosome occupancies can
be explained by systematic differences in mono- and dinucleotide content
between nucleosomal and linker DNA sequences, with periodic dinucleotide
distributions and longer sequence motifs playing a secondary role. Furthermore,
similar sequence signatures are exhibited by control experiments in which
genomic DNA is either sonicated or digested with micrococcal nuclease in the
absence of nucleosomes, making it possible that current predictions based on
high-throughput nucleosome positioning maps are biased by experimental
artifacts.Comment: 36 pages, 13 figure
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