Michael R. McCarthy

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Continuous passive motion (CPM) may have potential application as a physical modality in decreasing acute pain. The purpose of this study was to examine the effects of CPM immediately following an arthroscopically-assisted anterior cruciate ligament (ACL) reconstruction utilizing bone-patella-bone autograft on acute pain during the inflammatory phase of(More)
In this paper we present a user-centric position sensing system that is based on asynchronous, independent ultrasonic beacons. These stationary transmitter units are small, cheap to manufacture, and have power requirements low enough to run each from a small solar cell and a nearby light source. Each beacon is programmed to emit a short, 40 kHz ultrasonic(More)
A positioning system's design must account for several aspects of usability, most of which are determined by the application the system supports. The development of inexpensive, easy-to-use positioning technology simplifies the deployment of location-based applications. To explore the ubiquitous positioning systems' design space we use the term(More)
Ubiquitous computing technologies which are cheap and easy to use are more likely to be adopted by users beyond the ubiquitous computing community. We present an ultrasonic-only tracking system that is cheap to build, self-calibrating and self-orientating, and has a convenient form factor. The system tracks low-power tags in three dimensions. The tags are(More)
Pauses in distributed groupware activity can indicate anything from technical latency through infrastructure failure to a participant's thoughtful contemplation. Unraveling these ambiguities highlights mismatches between unseen off-screen activities and on-screen cursor behaviors. In this paper we suggest that groupware systems have typically been poor at(More)
This article describes the need and rationale for developing nursing informatics as a new area of graduate level specialization. Included are the results of a comprehensive needs assessment study that was conducted to determine the employment opportunities for graduates of such a program of study as well as the potential student applicant pool. The findings(More)
In this paper we present a study on how to estimate the position of a mobile receiver using ultrasonic beacons fixed in the environment. Unlike traditional approaches, the ultrasonic beacons are independent, and positioning is performed by measuring the Doppler shift within their observed periods. We show that this approach allows us to deduce both position(More)
The Dollar Bay Project is part of the North Dakota State University WWWIC (Worldwide Web Instructional Committee) Research effort. Dollar Bay is a fictitious seaside town simulated in an interactive, Web-based environment intended to teach the principles and practices of retailing. To begin the game, a player must first create a character and become a(More)