A Model for the Effectiveness of Aircraft Alerting and Warning Systems

The effectiveness of an alerting system with a single alert was analyzed. The pilot's decision behavior is modeled by the theory of signal detection and therefore accounts for different strengths of cross check information and different pilot criteria. The model includes the effects of the alerting and warning system (CAWS) error rate; the pilot's past experience with the CAWS accuracy; his reliance on the CAWS rather than independent monitoring; missed alerts; and adoption of a minimum error or Neyman-Pearson objective rather than minimum cost objective. It is showwn that for rare events: (1) the expected cost is greatly increased if the pilot ignores the a posteriori information in the existence of an alert; (2) the expected cost is insensitive to CAWS Type 1 errors; and (3) the expected cost is sensitive to CAWS type 2 errors only when the cross check information is ambiguous

NASTRAN as a resource in code development

A case history is presented in which the NASTRAN system provided both guidelines and working software for use in the development of a discrete element program, PATCHES-111. To avoid duplication and to take advantage of the wide spread user familiarity with NASTRAN, the PATCHES-111 system uses NASTRAN bulk data syntax, NASTRAN matrix utilities, and the NASTRAN linkage editor. Problems in developing the program are discussed along with details on the architecture of the PATCHES-111 parametric cubic modeling system. The system includes model construction procedures, checkpoint/restart strategies, and other features

Discovering indigenous peoples: Accounting and the machinery of empire

This study examines the historical usage of accounting as a technology of government within the domain of government-indigenous peoples relations in Canada. Our thesis is that accounting was salient within the chain of circumstances that influenced the discovery/identification of indigenous peoples as a governable population. By the 1830s, accounting techniques had come to occupy a central place in the military machinery of empire. When the cost-cutting and reformist sentiments prevalent in Britain during the early 1800s encouraged the reconsideration of the military costs of empire, accounting techniques were one of the methods used in the attempt to interrogate military expenditures. Partially as a result of these interrogations, indigenous peoples came to be identified as a site for cost cutting by British bureaucrats. However, it was at the level of the colonial administration in the Upper and Lower Canadas that the competing demands of government encouraged indigenous peoples to be viewed as a potential site for government. And it was once this discovery was made that accounting and other techniques were utilized in the attempt to turn indigenous peoples into a governable population. This study contributes to our understanding of accounting by documenting the ways in which techniques such as accounting were central to the military machinery of empire and British imperialism. The study also contributes to our understanding of the historical antecedents that shape current-day usages of accounting as a technology of government within the domain of government-First Nations relations

Evaluation of the effects of space environment exposure on index of refraction and extinction coefficients of Apollo window materials

Temperature and radiation effects on index of refraction and extinction coefficients of Apollo window material

Diamond nanophotonics

© 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. The burgeoning field of nanophotonics has grown to be a major research area, primarily because of the ability to control and manipulate single quantum systems (emitters) and single photons on demand. For many years, studying nanophotonic phenomena was limited to traditional semiconductors (including silicon and GaAs) and experiments were carried out predominantly at cryogenic temperatures. In the last decade, however, diamond has emerged as a new contender to study photonic phenomena at the nanoscale. Offering a plethora of quantum emitters that are optically active at room temperature and ambient conditions, diamond has been exploited to demonstrate super-resolution microscopy and realize entanglement, Purcell enhancement, and other quantum and classical nanophotonic effects. Elucidating the importance of diamond as a material, this progress report highlights the recent achievements in the field of diamond nanophotonics, and conveys a roadmap for future experiments and technological advancements

Random matrix theory for CPA: Generalization of Wegner's nn--orbital model

We introduce a generalization of Wegner's $n$-orbital model for the description of randomly disordered systems by replacing his ensemble of Gaussian random matrices by an ensemble of randomly rotated matrices. We calculate the one- and two-particle Green's functions and the conductivity exactly in the limit $n\to\infty$. Our solution solves the CPA-equation of the $(n=1)$-Anderson model for arbitrarily distributed disorder. We show how the Lloyd model is included in our model.Comment: 3 pages, Rev-Te

The Use of Strategic Forces to Understand Competitive Advantages Provided by Information Technology

Porter’s Five Forces model of business strategy is foundational to understanding strategic forces and the role of information technology in the larger strategic framework of an organization. The authors describe how information technology changes the strength and/or influence of the competitive forces in Porter’s model. Furthermore, understanding how specific technologies potentially change specific forces within Porter’s model is the foundation of IT strategy. This theoretical framework of strategic alignment is developed through cases demonstrating how specific technologies change the strategic forces within specific industries and how organizations should take advantage of these changing forces. Empirical evidence for the validity of this approach is established through interviews in 136 businesses. Results indicate the utility of Porter’s model as applied to strategic information technology was affirmed. Specific findings revealed how current technologies are impacting the competitive landscape

Institute of Chartered Accountants of Ontario (ICAO) and the emergence of ethical codes

Starting from the premise that ethical codes fulfil important ideological functions, we document the trajectory of the Institute of Chartered Accountants of Ontario\u27s [ICAO] ethical code since their incorporation in 1883. In the analysis that follows, we argue that shifts occurred in how the written ethical code spoke of, and conceptualized, professional ethics . We also propose that these shifts can be read as responses to changing circumstances: the ideological effect being to provide compelling reasons for the maintenance of professional privilege. The provided analysis contributes to our understanding of the role and functioning of ethical codes and highlights the political importance of memory, especially given the ahistorical nature of current day discussions of professional ethics