Timothy H. Harrison

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The CORBA Event Service provides a flexible model for asynchronous communication among objects. However, the standard CORBA Event Service specification lacks important features required by real-time applications. For instance, operational flight programs for fighter aircraft have complex real-time processing requirements. This paper describes the design and(More)
Many application domains (such as avionics, telecommunications , and multimedia) require real-time guarantees from the underlying networks, operating systems, and middleware components to achieve their quality of service (QoS) requirements. In addition to providing end-to-end QoS guarantees, applications in these domains must be flexible and reusable.(More)
This paper describes the design and performance of an object-oriented communication framework being developed by the Health Imaging division of Eastman Kodak and the Electronic Radiology Laboratory at Washington University School of Medicine. The framework is designed to meet the demands of next-generation electronic medical imaging systems, which must(More)
BACKGROUND Despite many studies addressing potential impact of helicopter transport on trauma mortality, debate as to the efficacy of air transport continues. METHODS This retrospective study combined trauma registry data from five urban Level I adult and pediatric centers. Logistic regression assessed effect of helicopter transport on mortality while(More)
This paper makes two contributions to the development and evaluation of object-oriented communication software. First, it reports performance results from benchmarking several network programming mechanisms (such as sockets and CORBA) on Ethernet and ATM networks. These results illustrate that developers of high-bandwidth, low-delay applications (such as(More)
This paper describes the design and performance of an object-oriented communication framework being developed by Kodak Health Imaging Systems and the Electronic Radiology Laboratory at Washington University School of Medicine. The framework is designed to meet the demands of Project Spectrum, which is a large-scale distributed electronic medical imaging(More)
OBJECTIVES Previous researchers have found that institution of an endotracheal intubation (ETI) protocol into a large urban paramedic program resulted in low success rates and had no beneficial effects. The primary goal of the current study was to assess ETI success rates achieved by a small cadre of nonphysician critical care transport (CCT) providers. A(More)
In theory, multi-threading an application can improve performance (by executing multiple instruction streams simultaneously) and simplify program structure (by allowing each thread to execute synchronously rather than reactively or asynchronously). In practice, multi-threaded applications often perform no better, or even worse, than single-threaded(More)
Many application domains (such as avionics, telecommunications , and multimedia) require real-time guarantees from the underlying networks, operating systems, and middleware components to achieve their quality of service (QoS) requirements. In addition to providing end-to-end QoS guarantees, applications in these domains must be flexible and reusable.(More)
Contemporary applications must respond to many types of events, ranging from user interface notifications to network messages. Delay-sensitive applications, such as network management systems, often perform long-running operations asynchronously to avoid blocking the processing of other pending events. When these asynchronous operations complete ,(More)