Home  About us  Contact
 

Sample Database (sample + database)

Distribution by Scientific Domains
Medical Sciences50%
Information Science and Computing50%

Selected Abstracts

Progressive multifocal leukoencephalopathy: A national estimate of frequency in systemic lupus erythematosus and other rheumatic diseases

ARTHRITIS & RHEUMATISM, Issue 12 2009
Eamonn S. Molloy
Objective Progressive multifocal leukoencephalopathy (PML) is a rare, typically fatal, central nervous system demyelinating disease that results from reactivation of the JC virus, which generally occurs in immunosuppressed hosts. The aim of this study was to generate a national estimate of the frequency of PML among patients with rheumatic diseases. Methods Data were obtained from the Nationwide Inpatient Sample database. This is a 20% sample of all hospital discharges, weighted to represent the entire US inpatient population. Data were analyzed for the years 1998,2005 inclusive, representing 297,797,180 hospital discharges. Cases of PML, systemic lupus erythematosus (SLE), and other rheumatic diseases were identified by diagnostic codes from the International Classification of Diseases, Ninth Revision, Clinical Modification. Results A total of 9,675 cases of PML were identified. The majority were associated with human immunodeficiency virus (HIV; 7,934 patients [82.00%]), hematologic cancers (813 patients [8.40%]), and solid cancers (274 patients [2.83%]). Among the rheumatic diseases, 43 cases of PML (0.44%) were associated with SLE, 24 (0.25%) with rheumatoid arthritis (RA), and 25 (0.26%) with other connective tissue diseases (CTDs). When patients with other potential risk factors for PML (HIV, malignancy, bone marrow or other organ transplantation) were excluded, the rates of PML per 100,000 discharges coded for SLE, RA, and other CTDs were 4, 0.4 and 2, respectively, compared with a rate of PML in the background population of 0.2/100,000 discharges. Conclusion This study was confined to hospitalized patients with rheumatic diseases, and it was also limited by the lack of information regarding immunosuppressive therapy. Nevertheless, the findings suggest that, although rare overall, PML occurs more commonly in SLE than in other rheumatic diseases. [source]

Analysis of co-articulation regions for performance-driven facial animation

COMPUTER ANIMATION AND VIRTUAL WORLDS (PREV: JNL OF VISUALISATION & COMPUTER ANIMATION), Issue 1 2004
Douglas Fidaleo
Abstract A facial gesture analysis procedure is presented for the control of animated faces. Facial images are partitioned into a set of local, independently actuated regions of appearance change termed co-articulation regions (CRs). Each CR is parameterized by the activation level of a set of face gestures that affect the region. The activation of a CR is analyzed using independent component analysis (ICA) on a set of training images acquired from an actor. Gesture intensity classification is performed in ICA space by correlation to training samples. Correlation in ICA space proves to be an efficient and stable method for gesture intensity classification with limited training data. A discrete sample-based synthesis method is also presented. An artist creates an actor-independent reconstruction sample database that is indexed with CR state information analyzed in real time from video. Copyright © 2004 John Wiley & Sons, Ltd. [source]

Consistent database sampling as a database prototyping approach

JOURNAL OF SOFTWARE MAINTENANCE AND EVOLUTION: RESEARCH AND PRACTICE, Issue 6 2002
Jesús Bisbal
Abstract Requirements elicitation has been reported to be the stage of software development when errors have the most expensive consequences. Users usually find it difficult to articulate a consistent and complete set of requirements at the beginning of a development project. Prototyping is considered a powerful technique to ease this problem by exposing a partial implementation of the software system to the user, who can then identify required modifications. When prototyping data-intensive applications a so-called prototype database is needed. This paper investigates how a prototype database can be built. Two different approaches are analysed, namely test databases and sample databases; the former populates the resulting database with synthetic values, while the latter uses data values from an existing database. The application areas that require prototype databases, in addition to requirements analysis, are also identified. The paper reports on existing research into the construction of both types of prototype databases, and indicates to which type of application area each is best suited. This paper advocates for the use of sample databases when an operational database is available, as is commonly the case in software maintenance and evolution. Domain-relevant data values and integrity constraints will produce a prototype database which will support the information system development process better than synthetic data. The process of extracting a sample database is also investigated. Copyright © 2002 John Wiley & Sons, Ltd. [source]

The burden of emergency department use for sickle-cell disease: An analysis of the national emergency department sample database,

AMERICAN JOURNAL OF HEMATOLOGY, Issue 10 2010
Sophie Lanzkron
No abstract is available for this article. [source]