Dorothy Curtis - Academia.edu (original) (raw)

Papers by Dorothy Curtis

Continuous, pervasive medical monitoring has the potential to improve the quality of healthcare i... more Continuous, pervasive medical monitoring has the potential to improve the quality of healthcare in the United States for hospitals and individuals. By monitoring continuously, medical emergencies can be detected

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Lecture Notes in Computer Science, 2015

This paper presents an assistive device for assessment and prevention of pressure ulcers in long-... more This paper presents an assistive device for assessment and prevention of pressure ulcers in long-term wheelchair patients. The system consists of several sensors deployed on the wheelchair non-invasively for monitoring pressure changes and tilt usage during daily activities. A pilot study was conducted to evaluate the potential capabilities of the system and the feasibility of implementing alarms based on clinical recommendations. During two weeks, six full-time wheelchair users with severe disability were monitored. Their wheelchairs were electric-powered and equipped with tilt-in-space systems and pressure relief cushions as methods for relieving pressure. Results show that the system is able to capture tilt usage and pressure changes during daily life. Also, it provides relevant information regarding to wheelchair occupancy and activity level. The study shows that most of the subjects spent long hours on the wheelchair without performing pressure relief as often as recommended, confirming the usefulness of a personalized alarm system.

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The main objective of this thesis is to provide a framework for evaluating the correctness of TCP... more The main objective of this thesis is to provide a framework for evaluating the correctness of TCP implementations. We use this framework in order to assess the completeness and correctness of four widely available implementations: DEC OSF 3.2, FreeBSD 2.2.2, Windows 95 and Windows NT 4.0. Through our evaluation, we will attempt to determine which TCP mechanisms each implementation provides and whether these mechanisms are implemented correctly according to TCP standards. We also show that our approach can be extended to evaluate the communication properties of applications that use TCP as their mean of communication. Our approach is to analyze real TCP traffic passively; that is, we obtain packet traces from the network and, later, we evaluate this traffic. In order to facilitate the evaluation process, we represent TCP traffic in graphical format. The development of a network traffic tracing tool was necessary to conduct the evaluation. The tool uses already existing packet tracing...

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La presente invention concerne des systemes et des procedes d'execution d'une auscultatio... more La presente invention concerne des systemes et des procedes d'execution d'une auscultation automatisee et d'un diagnostic de conditions du systeme cardio-vasculaire. L'invention acquiert un signal acoustique provenant du systeme cardio-vasculaire via un capteur. De plus, dans certains modes de realisation de l'invention, un signal electrique, par exemple un electrocardiogramme (EKG) est acquis simultanement. Les signaux sont numerises et facultativement filtres afin d'eliminer le bruit. Ensuite l'invention consiste a traiter et a analyser le signal/les signaux afin de donner une conclusion ou une recommandation cliniquement pertinente telle qu'un diagnostic, des analyses ou une therapie additionnelle suggeree. Dans les modes de realisation preferes, le systeme comprend: (1) un constituant de selection de battements lequel selectionne une pluralite de battements aux fins d'une analyse, chaque battement comprenant un signal acoustique emanant du sys...

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Information Sciences, 2016

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Organizational Initiatives

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Mobile Information Systems, 2016

This paper presents an assistive device for wheelchair users with severe disability. It consists ... more This paper presents an assistive device for wheelchair users with severe disability. It consists of several sensors deployed on a wheelchair, able to sense pressure relief habits, activity level, vital signs, and ambient conditions. A pilot study was conducted to evaluate the potential capabilities of the system and the feasibility of implementing alarms. During a period of two weeks, six full-time wheelchair users were monitored. Results show that the system is able to capture pressure relief patterns and tilt-in-space usage, a mechanism required to avoid pressure ulcers. Data analysis shows that none of the volunteers fully complied with the tilting recommendations. It also shows varied activity levels, both within and between patients, indicating their engagement in daily activities. The system is also able to estimate heart and respiration rate during passive activities (e.g., watching TV and/or resting). Also, high temperatures in summer were monitored while patients were outsi...

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This paper describes the implementation and evaluation of an operating system module, the Congest... more This paper describes the implementation and evaluation of an operating system module, the Congestion Manager (CM), which provides integrated network ow management and exports a convenient programming interface that allows applications to be notified of, and adapt to, changing network conditions. We describe the API by which applications interface with the CM, and the architectural considerations that factored into the design. To evaluate the architecture and API, we describe our implementations of TCP; a streaming layered audio/video application; and an interactive audio application using the CM, and show that they achieve adaptive behavior without incurring much end-system overhead. All flows including TCP benefit from the sharing of congestion information, and applications are able to incorporate new functionality such as congestion control and adaptive behavior.

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There is an increasing amount of data in the world that is distributed over many machines. Some o... more There is an increasing amount of data in the world that is distributed over many machines. Some of this data may be relatively static. However, certain types of data may be changing frequently. Client applications may be interested in changes that are made to a small subset of the data. Notification of such changes allows a client to be made aware of changes that are made by another client application in a timely fashion. In this paper, we explore the implementation of a notification mechanism in the unique object-oriented environment of the THOR distributed database system. 2 ACKNOWLEDGEMENTS I would like to express my heartfelt thanks to my advisor, Dorothy Curtis, for her invaluable contributions that went well above and beyond that of a thesis advisor. Her thoughtful support and guidance throughout the duration of this project truly helped make this the most satisfying learning experience of my academic career. I would also like to thank Sidney Chang for so selflessly giving of ...

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Proceedings Third International Conference on Mobile Data Management MDM 2002

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The Cricket indoor location system [1] was motivated by the importance of mobile and context-awar... more The Cricket indoor location system [1] was motivated by the importance of mobile and context-aware applications in sensor networks and pervasive computing environments, and the poor indoor performance of the Global Positioning System (GPS). A compelling attribute of applications in pervasive environments is context-awareness, being able to discover the external context and adapting accordingly. An important example of context is location: the position in some coordinate system of a device or user, the geographic space in which a device or user is (e.g., the room or portion of a room), or the orientation of a device within some coordinate system. Knowledge of location in the form of coordinate position, spatial resolution, and orientation (a.k.a. “directionality” or “heading”) enables a wide variety of pervasive computing applications such as resource discovery, pose-aware “point-and-use” interfaces, navigation, and augmented reality. Although location information in outdoor environm...

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Neural networks perform well when they are built for a specific task and the set of inputs and th... more Neural networks perform well when they are built for a specific task and the set of inputs and the set of outputs are well defined. However, these results are very limited in scope, and communication between different neural networks to share knowledge that can lead to the performance of more general tasks is still inadequate. Communication between specialized neural networks is the goal of the present work. We utilize independent sets of neural networks trained for specific tasks, while transferring knowledge among the neural networks allows them to evolve chaining the input and output information. The idea is based on computer network architecture, which is a communication system that transfers data between components inside a computer or between computers. The idea can similarly allow each neural network to specialize in its own task while transferring and receiving information from other neural networks. This can allow different neural networks to be plugged in and knowledge tra...

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