Digital Model of a Generic Infrared Tracker

Personal computer based simulations are popular because of the wide availability of personal computers. In this thesis, a simple simulation model of a generic infrared tracker is developed for the personal computer. This thesis first centers on the definition of a generic infrared tracker and the development of a tracker model. The remainder of this thesis is a description of the personal computer based computer simulation model, and a discussion of results of simulation runs to characterize the tracker model response. The conclusion of this thesis is that the simple simulation model serves both as a prototype for developing a simulation model of a real tracker, and as a simple introduction to infrared trackers

Research in the Aloha system

The Aloha system was studied and developed and extended to advanced forms of computer communications networks. Theoretical and simulation studies of Aloha type radio channels for use in packet switched communications networks were performed. Improved versions of the Aloha communications techniques and their extensions were tested experimentally. A packet radio repeater suitable for use with the Aloha system operational network was developed. General studies of the organization of multiprocessor systems centered on the development of the BCC 500 computer were concluded

Power system applications of fiber optics

Power system applications of optical systems, primarily using fiber optics, are reviewed. The first section reviews fibers as components of communication systems. The second section deals with fiber sensors for power systems, reviewing the many ways light sources and fibers can be combined to make measurements. Methods of measuring electric field gradient are discussed. Optical data processing is the subject of the third section, which begins by reviewing some widely different examples and concludes by outlining some potential applications in power systems: fault location in transformers, optical switching for light fired thyristors and fault detection based on the inherent symmetry of most power apparatus. The fourth and final section is concerned with using optical fibers to transmit power to electric equipment in a high voltage situation, potentially replacing expensive high voltage low power transformers. JPL has designed small photodiodes specifically for this purpose, and fabricated and tested several samples. This work is described

Progress toward practical quantum cryptanalysis by variational quantum cloning

Cryptanalysis of quantum cryptographic systems generally involves finding optimal adversarial attack strategies on the underlying protocols. The core principle of modeling quantum attacks often reduces to the ability of the adversary to clone unknown quantum states and to extract thereby meaningful secret information. Explicit optimal attack strategies typically require high computational resources due to large circuit depths or, in many cases, are unknown. Here we introduce variational quantum cloning (VarQlone), a cryptanalysis algorithm based on quantum machine learning, which allows an adversary to obtain optimal approximate cloning strategies with short depth quantum circuits, trained using hybrid classical-quantum techniques. The algorithm contains operationally meaningful cost functions with theoretical guarantees, quantum circuit structure learning and gradient-descent-based optimization. Our approach enables the end-to-end discovery of hardware-efficient quantum circuits to clone specific families of quantum states, which we demonstrate in an implementation on the Rigetti Aspen quantum hardware. We connect these results to quantum cryptographic primitives and derive explicit attacks facilitated by VarQlone. We expect that quantum machine learning will serve as a resource for improving attacks on current and future quantum cryptographic protocols

NASA Tech Briefs Index, 1976

Abstracts of new technology derived from the research and development activities of the National Aeronautics and Space Administration are presented. Emphasis is placed on information considered likely to be transferrable across industrial, regional, or disciplinary lines. Subject matter covered includes: electronic components and circuits; electronic systems; physical sciences; materials; life sciences; mechanics; machinery; fabrication technology; and mathematics and information sciences

Library Trends 41 (1) 1992: Libraries Serving an Underserved Population: Deaf and Hearing-Impaired Patrons

published or submitted for publicatio

Component-based control system development for agile manufacturing machine systems

It is now a common sense that manufactures including machine suppliers and system integrators of the 21 st century will need to compete on global marketplaces, which are frequently shifting and fragmenting, with new technologies continuously emerging. Future production machines and manufacturing systems need to offer the "agility" required in providing responsiveness to product changes and the ability to reconfigure. The primary aim for this research is to advance studies in machine control system design, in the context of the European project VIR-ENG - "Integrated Design, Simulation and Distributed Control of Agile Modular Machinery"

Surprise. Aesthetics and Sensibilities of Rhetorics

This dissertation investigates relationships scholars have with information and art associated with aesthetic and theoretical disruptions. Its governing metaphor is the surprise affect, figured as a rhetorical and aesthetic event. My purposes are to evaluate institutional and scholastic responses to both desirable and disastrous information-aesthetic liminalities, trial performative engagements with surprises, and propose viable ways of engaging innovation for writing instruction. It is argued that aesthetic (i.e., relational in the sense that it is not immediate), performative, and temporal engagements with surprising objects of study are relatively viable options when considered alongside the critical manuscript. While the aesthetic has sometimes occupied a minor and inferior position relative to codified and metricized intelligences, such relegation rests on false and pernicious but well known and persistent dichotomies including intelligibility v. sensibility, knowing v. feeling, thinking v. experiencing, and aesthetic v. epistemic. The intelligibility presupposed by the critical model, however, cannot achieve immediate engagement with its ostensible object ; it therefore remains relational and aesthetic. Few would counter the claim, yet actual performances of relation are rare. To test its payoff, the dissertation performs two engagements with challenging objects associated with surprise: novelty or the new as such, and the currency of idiosyncrasy in the timbre of recent electronic music. While not incidental, novelty and timbre are examples in the project\u27s larger attempt to rethink not just any given surprise, but ways of treating and dealing with the inevitability of metaphysical shock and overhaul