65,866 research outputs found
Unsupervised Motion Artifact Detection in Wrist-Measured Electrodermal Activity Data
One of the main benefits of a wrist-worn computer is its ability to collect a
variety of physiological data in a minimally intrusive manner. Among these
data, electrodermal activity (EDA) is readily collected and provides a window
into a person's emotional and sympathetic responses. EDA data collected using a
wearable wristband are easily influenced by motion artifacts (MAs) that may
significantly distort the data and degrade the quality of analyses performed on
the data if not identified and removed. Prior work has demonstrated that MAs
can be successfully detected using supervised machine learning algorithms on a
small data set collected in a lab setting. In this paper, we demonstrate that
unsupervised learning algorithms perform competitively with supervised
algorithms for detecting MAs on EDA data collected in both a lab-based setting
and a real-world setting comprising about 23 hours of data. We also find,
somewhat surprisingly, that incorporating accelerometer data as well as EDA
improves detection accuracy only slightly for supervised algorithms and
significantly degrades the accuracy of unsupervised algorithms.Comment: To appear at International Symposium on Wearable Computers (ISWC)
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The FORTRAN static source code analyzer program (SAP) user's guide, revision 1
The FORTRAN Static Source Code Analyzer Program (SAP) User's Guide (Revision 1) is presented. SAP is a software tool designed to assist Software Engineering Laboratory (SEL) personnel in conducting studies of FORTRAN programs. SAP scans FORTRAN source code and produces reports that present statistics and measures of statements and structures that make up a module. This document is a revision of the previous SAP user's guide, Computer Sciences Corporation document CSC/TM-78/6045. SAP Revision 1 is the result of program modifications to provide several new reports, additional complexity analysis, and recognition of all statements described in the FORTRAN 77 standard. This document provides instructions for operating SAP and contains information useful in interpreting SAP output
Fluoroether modified epoxy composites
Addition of controlled amounts of perfluorinated alkyl ether diacyl fluoride to epoxy resin systems prior to cure results in a formulation which, exhibits improved energy absorbing properties
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Knowledge management: Using a knowledge requirements framework to enhance UK health sector supply chains
The gaps of mismatch both knowledge and understanding of beneficiaries and solution providers at the
initial stage of developing projects have led to the failures of many projects including supply chains
(SC) and related information technology systems (ITS) projects (Lyytinen and Hirschheim, 1987) . The
aims of this paper are first, to address theoretical framework by bridging the gaps of different types of
knowledge. Second, to establishing business requirements and the flow of information in supply chains
between beneficiaries and solution providers in the long and complicated supply chains of the UKās
Health Sector. On the basis of brief introduction to knowledge, knowledge management and supply
chain, the paper presents a practical framework that has been developed through critical and relevant
literatures in the above three subject areas. Techniques and Tools stem from both management science
and information systems were used to provide a possible solution for the problem in bridging the gaps
of mismatch knowledge and understanding at the initial stage of identifying requirements in projects
through knowledge sharing and transfer
Measuring forces between protein fibers by microscopy
We propose a general scheme for measuring the attraction between mechanically frustrated semiflexible fibers by measuring their thermal fluctuations and shape. We apply this analysis to a system of sickle hemoglobin (HbS) fibers that laterally attract one another. These fibers appear to āzipā together before reaching mechanical equilibrium due to the existence of cross-links into a dilute fiber network. We are also able to estimate the rigidities of the fibers. These rigidities are found to be consistent with sickle hemoglobin āsingleā fibers 20 nm in diameter, despite recent experiments indicating that fiber bundling sometimes occurs. Our estimate of the magnitude of the interfiber attraction for HbS fibers is in the range 8 Ā± 7 kBT/Ī¼m, or 4 Ā± 3 kBT/Ī¼m if the fibers are assumed, a priori to be single fibers (such an assumption is fully consistent with the data). This value is sufficient to bind the fibers, overcoming entropic effects, although extremely chemically weak. Our results are compared to models for the interfiber attraction that include depletion and van der Waals forces. This technique should also facilitate a similar analysis of other filamentous protein assembles in the future, including Ī²-amyloid, actin, and tubulin
Modern Vertical Deformation above the Sumatran Subduction Zone: Paleogeodetic Insights from Coral Microatolls
Coral microatolls from the coast and outer-arc islands of Western Sumatra retain a stratigraphic and morphologic record of relative sea-level change, which is due in large part to vertical tectonic deformation above the Sumatran subduction zone. Low water levels, whose fluctuations produce measurable changes in coral morphology, limit the upward growth of the microatolls. Annual rings, derived from seasonal variations in coral density, serve as an internal chronometer of coral growth. The microatolls act as natural long-term tide gauges, recording sea-level variations on time scales of decades. Field observations and stratigraphic analysis of seven microatolls, five from the outer-arc islands and two from the mainland coast, indicate that the Mentawai Islands have been submerging at rates of 4ā10 mm/yr over the last four or five decades, while the mainland has remained relatively stable. The presence of fossil microatolls up to several thousand years old in the intertidal zone indicates that little permanent vertical deformation has occurred over that time. Thus, most of the strain accumulated in the past few decades represents interseismic deformation that is recovered during earthquakes. Elastic dislocation models using these submergence data suggest that elastic strain is being accumulated in the interseismic period and that the subduction zone in this region is fully coupled
Paying attention to meaning
Several paradigms show that responses to one event
compromise responses to a second event for around 500 ms.
Such effects are generally attributed to attentional capacity
limitations associated with processing information in the first
event. In a task in which targets could be distinguished only by
their meaning, we varied the semantic relationship between
distractors and targets following at different lags. Semantic
relatedness alone produced a classic attentional blink. We conclude
by discussing how attention theory might best accommodate
these new effects
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