Development and evaluation of a general aviation real world noise simulator

An acoustic playback system is described which realistically simulates the sounds experienced by the pilot of a general aviation aircraft during engine idle, take-off, climb, cruise, descent, and landing. The physical parameters of the signal as they appear in the simulator environment are compared to analogous parameters derived from signals recorded during actual flight operations. The acoustic parameters of the simulated and real signals during cruise conditions are within plus or minus two dB in third octave bands from 0.04 to 4 kHz. The overall A-weighted levels of the signals are within one dB of signals generated in the actual aircraft during equivalent maneuvers. Psychoacoustic evaluations of the simulator signal are compared with similar measurements based on transcriptions of actual aircraft signals. The subjective judgments made by human observers support the conclusion that the simulated sound closely approximates transcribed sounds of real aircraft

Behavioral indicators of pilot workload

Using a technique that requires a subject to consult an imagined or remembered spatial array while performing a visual task, a reliable reduction in the number of directed eye movements that are available for the acquisition of visual information is shown

Visual art inspired by the collective feeding behavior of sand-bubbler crabs

Sand--bubblers are crabs of the genera Dotilla and Scopimera which are known to produce remarkable patterns and structures at tropical beaches. From these pattern-making abilities, we may draw inspiration for digital visual art. A simple mathematical model is proposed and an algorithm is designed that may create such sand-bubbler patterns artificially. In addition, design parameters to modify the patterns are identified and analyzed by computational aesthetic measures. Finally, an extension of the algorithm is discussed that may enable controlling and guiding generative evolution of the art-making process

Men and Women of the Bar: The Impact of Gender on Legal Careers

In this study, we use the University of Michigan Law School Alumni Data Set to undertake an empirical analysis of the impact of gender on the legal profession and the differences that gender makes in the careers and lives of attorneys. With regular survey responses from Michigan alumni from 1967 until the present, the University of Michigan Law School Alumni Data Set provides a unique opportunity to examine these questions from the days when female attorneys were rare, to the arrival of the first generation of women to achieve significant presence in the legal profession

Men and Women of the Bar: The Impact of Gender on Legal Careers

In the last three and a half decades, the legal profession has undergone a dramatic transformation in the gender composition of its members. During that time, the number of women applying to law school and entering the profession has gone from a few gallant pioneers to roughly equal representation with that of men. Between 1970 and 2000, the proportion of first-year law students who were female climbed from 8% to 49%. Because the existing bar consisted primarily of male lawyers, the percent of women in the legal profession changed more slowly, but still rose dramatically. Women, as a percent of all practicing lawyers, have risen from 3% in 1970 to 27% in 2000, while the percent of lawyers who are men has made a corresponding decline. In just the thirty years from 1970 to 2000, the number of women in the legal profession increased from fewer than 10,000, to almost 300,000, marking a steady growth rate of 12% a year. Over the same period, the number of male lawyers has increased from approximately 290,000 to 780,000, for an annual growth rate of just 3.3% per year

Does Arbitration Blossom When State Courts are Bad?

It is often conjectured that non-state dispute resolution blossoms when state courts are not independent or are perceived as low-quality courts. This conjecture implies a substitutive relationship between state and non-state dispute resolution. An alternative hypothesis argues that both the quality and the frequency of use of these two alternative mechanisms are complementary: societies with high-quality state courts would also be able to provide high-quality non-state dispute resolution. This is the first study that puts these hypotheses to an empirical test. It turns out that the lower the perceived quality of state courts, the less frequently conflicting firms resort to them. Second, firms in common-law countries turn away from state courts significantly more often than firms in civil-law countries. This result sheds doubt on the robustness of results generated within the legal traditions literature. Finally, in states that have created the preconditions for arbitration, businesspeople resort significantly more often to state courts. We interpret this as evidence in favor of the complementarity hypothesis

Creativity and Autonomy in Swarm Intelligence Systems

This work introduces two swarm intelligence algorithms -- one mimicking the behaviour of one species of ants (\emph{Leptothorax acervorum}) foraging (a `Stochastic Diffusion Search', SDS) and the other algorithm mimicking the behaviour of birds flocking (a `Particle Swarm Optimiser', PSO) -- and outlines a novel integration strategy exploiting the local search properties of the PSO with global SDS behaviour. The resulting hybrid algorithm is used to sketch novel drawings of an input image, exploliting an artistic tension between the local behaviour of the `birds flocking' - as they seek to follow the input sketch - and the global behaviour of the `ants foraging' - as they seek to encourage the flock to explore novel regions of the canvas. The paper concludes by exploring the putative `creativity' of this hybrid swarm system in the philosophical light of the `rhizome' and Deleuze's well known `Orchid and Wasp' metaphor