Chris Petersen

Learn More
The first study with a PID controller based automatic drug delivery system for propofol anesthesia in children is presented. It is shown that a robustly tuned PID controller is capable of delivering safe and adequate anesthesia. The design process of the control system is reviewed. Results are discussed and compared to those of two previous studies in(More)
Infectious diseases such as pneumonia take the lives of millions of children in low- and middle-income countries every year. Many of these deaths could be prevented with the availability of robust and low-cost diagnostic tools using integrated sensor technology. Pulse oximetry in particular, offers a unique non-invasive and specific test for an increase in(More)
The development of mobile applications for the diagnosis and management of pregnant women with pre-eclampsia is described. These applications are designed for use by community-based health care providers (c-HCPs) in health facilities and during home visits to collect symptoms and perform clinical measurements (including pulse oximeter readings). The(More)
A modular framework for the development of medical applications that promotes deterministic, robust and correct code is presented. The system is based on the portable Gambit Scheme programming language and provides a flexible cross-platform environment for developing graphical applications on mobile devices as well as medical instrumentation interfaces(More)
The photoplethysmogram (PPG) obtained from pulse oximetry shows the local changes of blood volume in tissues. Respiration induces variation in the PPG baseline due to the variation in venous blood return during each breathing cycle. We have proposed an algorithm based on the synchrosqueezing transform (SST) to estimate instantaneous respiratory rate (IRR)(More)
—This paper describes the design of a robust PID controller for propofol infusion in children and presents the results of clinical evaluation of this closed-loop system during endoscopic investigations in children age 6y-17y. The controller design is based on a set of models that describes the inter-patient variability in the response to propofol infusion(More)
Many aspects of modern medicine, including the administration of anesthetic agents during general surgery, remain unautomated and reliant on the vigilance of the attending clinicians. In other fields where failures can have catastrophic consequences, such as the aviation and nuclear power industry, automated control regimens have been adopted to reduce the(More)
— This paper presents a novel approach to fuel efficient vehicle speed control. Motivated by potential fuel economy improvements through periodic time-varying cruise control, a finite state machine structure is designed to control transitions between discrete states of acceleration, constant speed, and deceleration. The scheme accounts for changes in road(More)
  • Lawrence S Powell, Editor, Dwight Jaffee, Howard Kunreuther, Erwann Michel-Kerjan, Robert Hoyt +46 others
  • 2010
Accounting & Reporting Accountants, members of the insurance industry and educators will find relevant information about statutory accounting practices and procedures. Consumer Information Consumers, educators and members of the insurance industry will find important answers to common questions in guides about auto, home, health and life insurance.(More)
  • 1