During the past three years, the Johns Hopkins University Applied Physics Laboratory, together with its subcontractors, have designed, fabricated, and deployed a number of sophisticated oceanographic instrumentation systems. These systems have been used to obtain detailed property measurements in the ocean in the vicinity of St. Croix, in the Virgin Islands. They include a large aperture-towed thermistor-fluorometer chain, a self-propelled underwater research vehicle, an acoustically tracked current/shear profiler, a moored current-meter array, and cable-deployed CTD and CTD microprofilers. A sampling of measurements made with each of the systems is presented. New methods of processing and displaying the data are discussed, and are used to describe some of the physical features of the ocean in the lee of the island of St. Croix.
Modern safety-critical systems (e.g., combined pacemaker/deliberator devices, distributed patient therapy delivery systems) incorporate more functionality than similar devices of the past. The development of these complex systems challenges existing quality assurance techniques; results in significantly longer development times; and demands greater staffing resources to ensure quality and timely product completion.
This is an interim report on a case study of the efficacy and viability of Automatic Code Generation (ACG) techniques applied in the development of real-time, safety-critical software-dependent systems [1]. The research uses Model-Based Software Engineering (MBSE) practices that incorporate integrated analysis and designiterations throughout the development process. The focus of these investigations is the application of automated code generation tools that embody various methodologies, in the development of safety critical systems. There was no attempt to embark on explicit tool comparisons or evaluations.
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