1,547 research outputs found
Informativeness of sleep cycle features in Bayesian assessment of newborn electroencephalographic maturation
Clinical experts assess the newborn brain development by analyzing and interpreting maturity-related features in sleep EEGs. Typically, these features widely vary during the sleep hours, and their informativeness can be different in different sleep stages. Normally, the level of muscle and electrode artifacts during the active sleep stage is higher than that during the quiet sleep that could reduce the informative-ness of features extracted from the active stage. In this paper, we use the methodology of Bayesian averaging over Decision Trees (DTs) to assess the newborn brain maturity and explore the informativeness of EEG features extracted from different sleep stages. This methodology has been shown providing the most accurate inference and estimates of uncertainty, while the use of DT models enables to find the EEG features most important for the brain maturity assessment
Feature extraction from electroencephalograms for Bayesian assessment of newborn brain maturity
We explored the feature extraction techniques for Bayesian assessment of EEG maturity of newborns in the context that the continuity of EEG is the most important feature for assessment of the brain development. The continuity is associated with EEG “stationarity” which we propose to evaluate with adaptive segmentation of EEG into pseudo-stationary intervals. The histograms of these intervals are then used as new features for the assessment of EEG maturity. In our experiments, we used Bayesian model averaging over decision trees to differentiate two age groups, each included 110 EEG recordings. The use of the proposed EEG features has shown, on average, a 6% increase in the accuracy of age differentiation
Nahm's Equations and Rational Maps from to
We consider Nahm's equations on a bounded open interval with first order
poles at the ends. By imposing further boundary conditions, extended moduli
spaces are identified with spaces of rational maps from
to . Having the residues at
one end define sums of irreducible representations of , the
dimensions of those summands correspond to holomorphic charge on the rational
map side. Technical difficulties arise due to half powers in the boundary
conditions. Further, a symplectomorphic identification with moduli spaces
corresponding to spaces of rational maps into complete flag varieties is given.Comment: 41 pages, 5 figure
Wissen im Doppelpack : Fallbasierte Expertensystemshell CBR Express
Die fallbasierte Expertensystemshell CBR Express wird vorgestellt
"If You Can't Beat them, Join them": A Usability Approach to Interdependent Privacy in Cloud Apps
Cloud storage services, like Dropbox and Google Drive, have growing
ecosystems of 3rd party apps that are designed to work with users' cloud files.
Such apps often request full access to users' files, including files shared
with collaborators. Hence, whenever a user grants access to a new vendor, she
is inflicting a privacy loss on herself and on her collaborators too. Based on
analyzing a real dataset of 183 Google Drive users and 131 third party apps, we
discover that collaborators inflict a privacy loss which is at least 39% higher
than what users themselves cause. We take a step toward minimizing this loss by
introducing the concept of History-based decisions. Simply put, users are
informed at decision time about the vendors which have been previously granted
access to their data. Thus, they can reduce their privacy loss by not
installing apps from new vendors whenever possible. Next, we realize this
concept by introducing a new privacy indicator, which can be integrated within
the cloud apps' authorization interface. Via a web experiment with 141
participants recruited from CrowdFlower, we show that our privacy indicator can
significantly increase the user's likelihood of choosing the app that minimizes
her privacy loss. Finally, we explore the network effect of History-based
decisions via a simulation on top of large collaboration networks. We
demonstrate that adopting such a decision-making process is capable of reducing
the growth of users' privacy loss by 70% in a Google Drive-based network and by
40% in an author collaboration network. This is despite the fact that we
neither assume that users cooperate nor that they exhibit altruistic behavior.
To our knowledge, our work is the first to provide quantifiable evidence of the
privacy risk that collaborators pose in cloud apps. We are also the first to
mitigate this problem via a usable privacy approach.Comment: Authors' extended version of the paper published at CODASPY 201
Neuartige Plattenwärmeübertrager - Teil B: Zum Einfluss von Bypass-Strömung auf Druckverlust und Wärmeübergang in Plattenwärmeübertragern
Im Rahmen von experimentellen Leistungstests an Plattenwärmeübertragern tritt u.a. die Frage nach dem Einfluss von Bypassströmungen im Mantelraum auf. Zweifellos werden sowohl Druckverlust als auch Wärmeübergang davon beeinflusst. In der vorliegenden Arbeit soll dieser Frage nachgegangen werden
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