scholarly journals Graph Analysis for Detecting Fraud, Waste, and Abuse in Healthcare Data

AI Magazine ◽  
2016 ◽  
Vol 37 (2) ◽  
pp. 33-46 ◽  
Author(s):  
Juan Liu ◽  
Eric Bier ◽  
Aaron Wilson ◽  
John Alexis Guerra-Gomez ◽  
Tomonori Honda ◽  
...  
Keyword(s):  
Network Structure ◽  
Heterogeneous Network ◽  
Graph Analysis ◽  
Challenging Problem ◽  
Analysis Techniques ◽  
Healthcare Data ◽  
On Demand ◽  
Potential Value ◽  
Changes Over Time ◽  
Over Time

Detection of fraud, waste, and abuse (FWA) is an important yet challenging problem. In this article, we describe a system to detect suspicious activities in large healthcare datasets. Each healthcare dataset is viewed as a heterogeneous network consisting of millions of patients, hundreds of thousands of doctors, tens of thousands of pharmacies, and other entities. Graph analysis techniques are developed to find suspicious individuals, suspicious relationships between individuals, unusual changes over time, unusual geospatial dispersion, and anomalous network structure. The visualization interface, known as the Network Explorer, provides a good overview of data and enables users to filter, select, and zoom into network details on demand. The system has been deployed on multiple sites and datasets, both government and commercial, and identified many overpayments with a potential value of several million dollars per month.

scholarly journals Views from the boundaries

2021 ◽  
Vol 37 (70) ◽  
pp. 032-049
Author(s):  
Daniel Nordgård
Keyword(s):  
Economic Models ◽  
Qualitative Approach ◽  
On Demand ◽  
Growing Body ◽  
Changes Over Time ◽  
Depth Interviews ◽  
Over Time

This article explores how Norwegian record label managers understand their current positions and future possibilities in a market that is increasingly driven by on-demand subscription-based streaming. It adds to a growing body of research by adopting a qualitative approach, seeking to describe issues at a personal or company level, and provide nuance and dynamics in a discourse that is often described in dichotomies and on aggregate levels. The article argues that stakeholders have more varied attitudes than simply being for or against the innovation, the new economic models and their eff ects on their own business, and the market in general. It also demonstrates that perceptions change as markets develop, and stakeholders and their businesses adjust. The article uses four in-depth interviews to assess a 2013 government-initiated project, and provides insights into differing positions and changes over time.

The Experience of Feminism

1989 ◽  
Vol 13 (2) ◽  
pp. 133-146 ◽  
Author(s):  
Ellen B. Kimmel
Keyword(s):  
Lived Experience ◽  
Thematic Analysis ◽  
Presidential Address ◽  
Phenomenological Method ◽  
Analysis Techniques ◽  
Changes Over Time ◽  
Over Time

For this Presidential Address, Fellows of Division 35 were surveyed by means of an open-ended questionnaire about their experience of feminism. The narrative data of a sample of the 51 replies received were analyzed using thematic analysis techniques adapted from an existential phenomenological method. Participants shared many themes, indicating that the experience of feminism can be defined through reports of its lived experience and that this experience changes over time.

scholarly journals Dynamic View Selection for OLAP

2011 ◽  
pp. 91-106
Author(s):  
Lawrence Michael ◽  
Rau-Chaplin Andrew
Keyword(s):  
Data Warehousing ◽  
Materialized Views ◽  
Challenging Problem ◽  
View Selection ◽  
Dynamic View ◽  
Aggregate Queries ◽  
Speed Up ◽  
Analytical Processing ◽  
Changes Over Time ◽  
Over Time

In a data warehousing environment, aggregate views are often materialized in order to speed up aggregate queries of online analytical processing (OLAP). Due to the increasing size of data warehouses, it is often infeasible to materialize all views. View selection, the task of selecting a subset of views to materialize based on updates and expectations of the query load, is an important and challenging problem. In this article, we explore dynamic view selection in which the distribution of queries changes over time and the set of materialized views must be tuned by replacing some of the previously materialized views with new ones.

Comparison of two devices for measuring exercise transcutaneous oxygen pressures in patients with claudication

VASA ◽  
2015 ◽  
Vol 44 (5) ◽  
pp. 355-362 ◽  
Author(s):  
Marie Urban ◽  
Alban Fouasson-Chailloux ◽  
Isabelle Signolet ◽  
Christophe Colas Ribas ◽  
Mathieu Feuilloy ◽  
...  
Keyword(s):  
Oxygen Pressure ◽  
Optical Sensors ◽  
Chemical Sensors ◽  
Transcutaneous Oxygen ◽  
Starting Values ◽  
Two Systems ◽  
Transcutaneous Oxygen Pressure ◽  
New Sensors ◽  
Changes Over Time ◽  
Over Time

Abstract. Summary: Background: We aimed at estimating the agreement between the Medicap® (photo-optical) and Radiometer® (electro-chemical) sensors during exercise transcutaneous oxygen pressure (tcpO2) tests. Our hypothesis was that although absolute starting values (tcpO2rest: mean over 2 minutes) might be different, tcpO2-changes over time and the minimal value of the decrease from rest of oxygen pressure (DROPmin) results at exercise shall be concordant between the two systems. Patients and methods: Forty seven patients with arterial claudication (65 + / - 7 years) performed a treadmill test with 5 probes each of the electro-chemical and photo-optical devices simultaneously, one of each system on the chest, on each buttock and on each calf. Results: Seventeen Medicap® probes disconnected during the tests. tcpO2rest and DROPmin values were higher with Medicap® than with Radiometer®, by 13.7 + / - 17.1 mm Hg and 3.4 + / - 11.7 mm Hg, respectively. Despite the differences in absolute starting values, changes over time were similar between the two systems. The concordance between the two systems was approximately 70 % for classification of test results from DROPmin. Conclusions: Photo-optical sensors are promising alternatives to electro-chemical sensors for exercise oximetry, provided that miniaturisation and weight reduction of the new sensors are possible.

Neuropsychological Symptoms in Posttraumatic Stress Disorder and Changes Over Time

2007 ◽  
Author(s):  
Miranda Olff ◽  
Mirjam Nijdam ◽  
Kristin Samuelson ◽  
Julia Golier ◽  
Mariel Meewisse ◽  
...  
Keyword(s):  
Posttraumatic Stress Disorder ◽  
Posttraumatic Stress ◽  
Stress Disorder ◽  
Neuropsychological Symptoms ◽  
Changes Over Time ◽  
Over Time

Changes Over Time in Adaptive Behavior Functioning of Twice-Exceptional Children

2010 ◽  
Author(s):  
Rebecca D. Stinson ◽  
Zachary Sussman ◽  
Megan Foley Nicpon ◽  
Allison L. Allmon ◽  
Courtney Cornick ◽  
...  
Keyword(s):  
Adaptive Behavior ◽  
Exceptional Children ◽  
Twice Exceptional ◽  
Changes Over Time ◽  
Over Time

Kategorisierung der Schädelform des Cavalier King Charles Spaniels

2019 ◽  
Vol 47 (02) ◽  
pp. 133-133
Keyword(s):  
Pilot Study ◽  
Cavalier King Charles Spaniel ◽  
Conformation Changes ◽  
Veterinary Record ◽  
Changes Over Time ◽  
Over Time

Knowler SP, Gillstedt L, Mitchell TJ et al. Pilot study of head conformation changes over time in the Cavalier King Charles spaniel breed. Veterinary Record 2019. doi:10.1136/vr.105135.

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