1,286 research outputs found
In Search of Independent Variables Beyond Speed: Five Factors of Affecting Network User Satisfaction
Blending in Gravitational Microlensing Experiments: Source Confusion And Related Systematics
Gravitational microlensing surveys target very dense stellar fields in the
local group. As a consequence the microlensed source stars are often blended
with nearby unresolved stars. The presence of `blending' is a cause of major
uncertainty when determining the lensing properties of events towards the
Galactic centre. After demonstrating empirical cases of blending we utilize
Monte Carlo simulations to probe the effects of blending. We generate
artificial microlensing events using an HST luminosity function convolved to
typical ground-based seeing, adopting a range of values for the stellar density
and seeing. We find that a significant fraction of bright events are blended,
contrary to the oft-quoted assumption that bright events should be free from
blending. We probe the effect that this erroneous assumption has on both the
observed event timescale distribution and the optical depth, using realistic
detection criteria relevent to the different surveys. Importantly, under this
assumption the latter quantity appears to be reasonably unaffected across our
adopted values for seeing and density. The timescale distribution is however
biased towards smaller values, even for the least dense fields. The dominant
source of blending is from lensing of faint source stars, rather than lensing
of bright source stars blended with nearby fainter stars. We also explore other
issues, such as the centroid motion of blended events and the phenomena of
`negative' blending. Furthermore, we breifly note that blending can affect the
determination of the centre of the red clump giant region from an observed
luminosity function. This has implications for a variety of studies, e.g.
mapping extinction towards the bulge and attempts to constrain the parameters
of the Galactic bar through red clump giant number counts. (Abridged)Comment: 18 pages, 10 figures. MNRAS (in press
Red-green-blue light sensitivity of oxide nanowire transistors for transparent display applications
In this study, the sensitivity of oxide nanowire transistors under red (R, 470 nm), green (G, 530 nm), and blue (B, 625 nm) light illumination was investigated. As the wavelength of light illuminating the nanowire channel region became shorter, a negative shift of threshold voltage, degradation of subthreshold slope, and increase of on-current were observed. This phenomenon can be explained in terms of photoinduced holes, creating interfacial traps between the gate dielectric and nanowire channel or reacting with oxygen ions on the surface of the nanowires. Thus, the attempt to minimize characteristic changes due to all RGB light sources was performed by employing ultraviolet-ozone treatment and passivation process. As a result, we could successfully fabricate oxide nanowire transistors providing high optical reliability which has broadened the possibilities for applying it to transparent and/or flexible pixel operation circuitry for displays with high optical reliability. Copyright 2013 Author(s). This article is distributed under a Creative Commons Attribution 3.0 Unported License. [http://dx.doi.org/10.1063/1.4789405
Persim - Simulator for Human Activities in Pervasive Spaces
Activity recognition research relies heavily on test data to verify the modeling technique and the performance of the activity recognition algorithm. But data from real deployments are expensive and time consuming to obtain. And even if cost is not an issue, regulatory limitations on the use of human subjects prohibit the collection of extensive datasets that can test all scenarios, under all circumstances. A powerful and verifiable simulation tool is needed to accelerate research on human activity recognition. We present Persim, an event driven simulator of human activities in pervasive spaces. Persim is capable of capturing elements of space, sensors, behaviors (activities), and their inter-relationships. We focus on presenting the five main use cases for Persim addressing dataset synthesis, reuse and extension of existing datasets, sharing of data and simulation projects, as well as data validation. © 2011 IEEE
Bandwidth-Controlled Insulator-Metal Transition and Correlated Metallic State in 5 Transition Metal Oxides SrIrO (=1, 2, and )
We investigated the electronic structures of the 5 Ruddlesden-Popper
series SrIrO (=1, 2, and ) using optical
spectroscopy and first-principles calculations. As 5 orbitals are spatially
more extended than 3 or 4 orbitals, it has been widely accepted that
correlation effects are minimal in 5 compounds. However, we observed a
bandwidth-controlled transition from a Mott insulator to a metal as we
increased . In addition, the artificially synthesized perovskite SrIrO
showed a very large mass enhancement of about 6, indicating that it was in a
correlated metallic state
Design of Object-based Information System Prototype
Researchers who use science and technology information were found to ask an information service in which they can excerpt the contents they needed, rather than using the information at article level. In this study, we micronized the contents of scholarly articles into text, image, and table and then constructed a micro-content DB to design a new information system prototype based on this micro-content. After designing the prototype, we performed usability test for this prototype so as to confirm the usefulness of the system prototype. We expect that the outcome of this study will fulfill the segmented and diversified information need of researchers
Free licensing strategy and ex post privatization in a mixed oligopoly
This paper investigates free licensing strategy with a flexible privatization policy in a mixed oligopoly in which licensing contracts are observable before the government chooses its optimal degree of ex post privatisation. We examine and compare foreign and public licensors and explore the strategic relationship between the foreign share of passive ownership in domestic firms and the cost efficiency gap between licensor and licensee. We show that licensing strategies always yield more privatization and higher welfare, but the incentive for free licensing between the foreign licensor and public licensor differ. We also consider open technology, where all firms have the same technology and find a contrasting result. The optimal degree of privatization under open technology is the lowest (highest) under foreign (public) licensing contracts
Detectability of Orbital Motion in Stellar Binary and Planetary Microlenses
A standard binary microlensing event lightcurve allows just two parameters of
the lensing system to be measured: the mass ratio of the companion to its host,
and the projected separation of the components in units of the Einstein radius.
However, other exotic effects can provide more information about the lensing
system. Orbital motion in the lens is one such effect, which if detected, can
be used to constrain the physical properties of the lens. To determine the
fraction of binary lens lightcurves affected by orbital motion (the detection
efficiency) we simulate lightcurves of orbiting binary star and star-planet
(planetary) lenses and simulate the continuous, high-cadence photometric
monitoring that will be conducted by the next generation of microlensing
surveys that are beginning to enter operation. The effect of orbital motion is
measured by fitting simulated lightcurve data with standard static binary
microlensing models; lightcurves that are poorly fit by these models are
considered to be detections of orbital motion. We correct for systematic false
positive detections by also fitting the lightcurves of static binary lenses.
For a continuous monitoring survey without intensive follow-up of high
magnification events, we find the orbital motion detection efficiency for
planetary events with caustic crossings to be 0.061+-0.010, consistent with
observational results, and 0.0130+-0.0055 for events without caustic crossings
(smooth events). Similarly for stellar binaries, the orbital motion detection
efficiency is 0.098+-0.011 for events with caustic crossings and is
0.048+-0.006 for smooth events. These result in combined (caustic crossing and
smooth) orbital motion detection efficiencies of 0.029+-0.005 for planetary
lenses and 0.070+-0.006 for stellar binary lenses. We also investigate how
various microlensing parameters affect the orbital motion detectability.
[Abridged]Comment: 21 pages, 22 figures, 5 table
Enabling End-To-End Orchestration of Multi-Cloud Applications
The orchestration of application components across heterogeneous cloud providers is a problem that has been tackled using various approaches, some of which led to the creation of cloud orchestration and management standards, such as TOSCA and CAMP. Standardization is a definitive method of providing an end-To-end solution capable of defining, deploying, and managing applications and their components across heterogeneous cloud providers. TOSCA and CAMP, however, perform different functions with regard to cloud applications. TOSCA is focused primarily on topology modeling and orchestration, whereas CAMP is focused on deployment and management of applications. This paper presents a novel solution that not only involves the combination of the emerging standards TOSCA and CAMP, but also introduces extensions to CAMP to allow for multi-cloud application orchestration through the use of declarative policies. Extensions to the CAMP platform are also made, which brings the standards closer together to enable a seamless integration. Our proposal provides an end-To-end cloud orchestration solution that supports a cloud application modeling and deployment process, allowing a cloud application to span and be deployed over multiple clouds. The feasibility and the benefit of our approach are demonstrated in our validation study
Amniotic membrane transplantation for wound dehiscence after deep lamellar keratoplasty: a case report
<p>Abstract</p> <p>Purpose</p> <p>To report amniotic membrane (AM) transplantation in a patient with wound dehiscence 5 months after deep lamellar keratoplasty (DLKP)</p> <p>Methods</p> <p>The patient was an 84-year-old Japanese man who had undergone right DLKP 5 months earlier for central corneal scarring due to recurrent stromal herpetic keratitis. He developed wound dehiscence with corneal stromal melting due to recurrence of stromal herpes in both the donor and recipient sites. "AM roll-in filling technique" and AM patching were performed.</p> <p>Results</p> <p>Following AM transplantation, stromal inflammation subsided and complete epithelization occurred within 10 days of surgery.</p> <p>At 8 months postoperatively, biomicroscopy revealed stable wound apposition or stromal gain. Following AM transplantation, stromal inflammation subsided and complete epithelialization was achieved within 10 days after surgery.</p> <p>Conclusion</p> <p>AM transplantation may offer an effective treatment modality for herpetic corneal wound dehiscence after DLKP.</p
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