474 research outputs found
Sensor Drift Compensation Using Fuzzy Interference System and Sparse-Grid Quadrature Filter in Blood Glucose Control
Diabetes mellitus is a serious chronic condition of the human
metabolism. The development of an automated treatment has reached
clinical phase in the last few years. The goal is to keep the blood glucose
concentration within a certain region with minimal interaction required
by the patient or medical personnel. However, there are still several prac-
tical problems to solve. One of these would be that the available sensors
have significant noise and drift. The latter is rather difficult to manage,
because the deviating signal can cause the controller to drive the glu-
cose concentration out of the safe region even in the case of frequent
calibration. In this study a linear-quadratic-Gaussian (LQG) controller
is employed on a widely used diabetes model and enhanced with an ad-
vanced Sparse-grid quadratic filter and a fuzzy interference system-based
calibration supervisor
Data Mining the SDSS SkyServer Database
An earlier paper (Szalay et. al. "Designing and Mining MultiTerabyte
Astronomy Archives: The Sloan Digital Sky Survey," ACM SIGMOD 2000) described
the Sloan Digital Sky Survey's (SDSS) data management needs by defining twenty
database queries and twelve data visualization tasks that a good data
management system should support. We built a database and interfaces to support
both the query load and also a website for ad-hoc access. This paper reports on
the database design, describes the data loading pipeline, and reports on the
query implementation and performance. The queries typically translated to a
single SQL statement. Most queries run in less than 20 seconds, allowing
scientists to interactively explore the database. This paper is an in-depth
tour of those queries. Readers should first have studied the companion overview
paper Szalay et. al. "The SDSS SkyServer, Public Access to the Sloan Digital
Sky Server Data" ACM SIGMOND 2002.Comment: 40 pages, Original source is at
http://research.microsoft.com/~gray/Papers/MSR_TR_O2_01_20_queries.do
Comparison of sigma-point filters for state estimation of diabetes models
In physiological control there is a need to esti-
mate signals that cannot be measured directly. Burdened by
measurement noise and unknown disturbances this proves to be
challenging, since the models are usually highly nonlinear. Sigma-
point filters could represent an adequate choice to overcome
this problem. The paper investigates the applicability of several
different versions of sigma-point filters for the Artificial Pancreas
problem on the widely used Cambridge (Hovorka)-model
SUPERVISING MICROWAVE TELECOMMUNICATION NETWORKS WITH THE REALEX EXPERT SYSTEM SHELL
To effectively supervise a telecommunication network, an intelligent supervisory system is proposed consisting of a traditional process monitoring. a fault diagnostic, a communication handler and a database manager subsystem. The whole system is based on a generic expert system shell designed to operate in industrial environment. The diagnostic subsystem contains a two-level inference engine to operate on structural information and traditional if-then rules. To ensure easy mapping of the supervisory system to any telecommunication network a configuration environment consisting of several compilers integrated into a multi-window editor was also developed. The system was implemented on two interconnected IBM PC-s running MS WINDOWS 3.0
Distribution of Maximal Luminosity of Galaxies in the Sloan Digital Sky Survey
Extreme value statistics (EVS) is applied to the distribution of galaxy luminosities in the Sloan Digital Sky Survey (SDSS). We analyze the DR8 Main Galaxy Sample (MGS), as well as the Luminous Red Galaxies (LRG). Maximal luminosities are sampled from batches consisting of elongated pencil beams in the radial direction of sight. For the MGS, results suggest a small and positive tail index , effectively ruling out the possibility of having a finite maximum cutoff luminosity, and implying that the luminosity distribution function may decay as a power law at the high luminosity end. Assuming, however, , a non-parametric comparison of the maximal luminosities with the Fisher-Tippett-Gumbel distribution (limit distribution for variables distributed by the Schechter fit) indicates a good agreement provided uncertainties arising both from the finite batch size and from the batch size distribution are accounted for. For a volume limited sample of LRGs, results show that they can be described as being the extremes of a luminosity distribution with an exponentially decaying tail, provided the uncertainties related to batch-size distribution are taken care of
The Sloan Digital Sky Survey Science Archive: Migrating a Multi-Terabyte Astronomical Archive from Object to Relational DBMS
The Sloan Digital Sky Survey Science Archive is the first in a series of
multi-Terabyte digital archives in Astronomy and other data-intensive sciences.
To facilitate data mining in the SDSS archive, we adapted a commercial database
engine and built specialized tools on top of it. Originally we chose an
object-oriented database management system due to its data organization
capabilities, platform independence, query performance and conceptual fit to
the data. However, after using the object database for the first couple of
years of the project, it soon began to fall short in terms of its query support
and data mining performance. This was as much due to the inability of the
database vendor to respond our demands for features and bug fixes as it was due
to their failure to keep up with the rapid improvements in hardware
performance, particularly faster RAID disk systems. In the end, we were forced
to abandon the object database and migrate our data to a relational database.
We describe below the technical issues that we faced with the object database
and how and why we migrated to relational technology
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