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A variety of methods for obtaining detailed analyses regarding the timing and duration of winter weather across the state of Indiana for multiple seasons were compared and evaluated during this project. Meteorological information from sources such as surface reporting stations, National Weather Service radars, and three-dimensional weather analysis and prediction systems were utilized in this work. In addition, daily weather forecasts were provided by students at Purdue University during the 2012-13 winter season. These forecasts supplemented the weather forecast information already in use at INDOT. Purdue weather forecasts were systematically evaluated during this project. The results from these assessments are provided in this report, along with a set of recommendations for sources of detailed weather information to be utilized by INDOT in future winter seasons.

A variety of methods for obtaining detailed analyses regarding the timing and duration of winter weather across the state of Indiana for multiple seasons were compared and evaluated during this project. Meteorological information from sources such as surface reporting stations, National Weather Service radars, and three-dimensional weather analysis and prediction systems were utilized in this work. In addition, daily weather forecasts were provided by students at Purdue University during the 2012-13 winter season. These forecasts supplemented the weather forecast information already in use at INDOT. Purdue weather forecasts were systematically evaluated during this project. The results from these assessments are provided in this report, along with a set of recommendations for sources of detailed weather information to be utilized by INDOT in future winter seasons.

An upset is a deviation of system performance based on apriori knowledge of the system application task. There has heretofore been little experimental work reported in the literature regarding characterizations of upsets in computer systems. This problem was addressed in the research reported in this paper with two series of fault injection experiments on a representative microprocessor-based system. In the first series, the system executes a small machine language program; in the second series, a much larger software environment consisting of a Pascal interpreter running a general applications program is used. For each case, a broad spectrum of fault conditions is utilized for the fault injections. An extensive instrumentation complex has been developed to record microevent data associated with the upsets resulting from the injections. This data is used to characterize upsets in computer-based systems. It also serves as a benchmark for the performance of candidate upset monitors in the sense that coverage and latency figures for such devices can be deduced from this data. (Author), This article is from 'International Aerospace and Ground Conference on Lightning and Static Electricity (8th): 'Lightning Technology Roundup,' held at Fort Worth, Texas on 21-23 June 1983,' AD-A135 100, p78-1 thru 78-15.

Missile seekers will confront complex and hostile signal environments that can inhibit severely their ability to intercept threatening targets. Dramatic target detection and homing performance improvement in main beam and sidelobe jamming is realizable with a seeker antenna that can optimally adapt, in real time, its response to the signal environment. Adaptive array antennas can be designed to optimize the signal-to-interference-plus-noise ratio by forming pattern nulls directed toward sources of interference while simultaneously maximizing gain in the desired signal direction. Physical and operational missile constraints place severe requirements on an adaptive array. Nevertheless, there are several array configurations and adaptive processors that can satisfy these constraints in the next decade. Technology is a dominant limitation to adaptive array performance in a missile seeker. Signal processors and array implementations using state-of-the-art technology are required. Critical experimentation and representative simulations are needed to establish error effects, preferred adaptive array implementations, detailed requirements, and relative cost estimates. Although an adaptive missile seeker antenna is physically realizable in the next decade, the tradeoffs between cost, complexity, and performance will determine its utility and practicality. (Author)