Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 43 for “"Warning signals"”.
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Predators vs. Prey: The information ecology of warning signals
… for evolutionary biologists because conspicuous warning signals are predicted to have a high initial predation cost before predators learn to avoid them. Most previous work has assumed that predators need to sample prey individually (personal information) to learn about these defences, however …
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Modelling the evolution of warning signals and mimicry with individual-based simulations
… for the origin and maintenance of animal warning displays and mimicry. The early chapters of the thesis review the literature on evolution and coevolution in general, as well as setting out a position on the use of computational models in science. The focus then moves to the evolution of …
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Poison frog warning signals: From the rainforest to the genome and back again
… and heterospecifics. Aposematic species use warning signals (e.g. bright coloration) to alert predators to the presence of a secondary defense (e.g., spines, toxins, etc). The presence of a conspicuous signal in combination with a secondary defense is thought to increase the efficiency of …
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The Detection of Warning Signals While Wearing Active Noise Reduction and Passive Hearing Protection Devices
The research described herein was undertaken to determine how masked thresholds changed when individuals wore an active noise reduction (ANR) hearing protection device (HPD), a passive HPD, or no HPD. An ANR earmuff, a passive earmuff, and a user-molded foam earplug were tested in two types of …
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The perceived urgency and detection time of multi-tone and frequency-modulated warning signals in broadband noise
… the perceived (psychoacoustic) urgency of a warning and its situational urgency. In addition, many auditory warnings are not detectable within their environments. This research examined several prominent pulse parameters which affect the perceived urgency and detection time of auditory …
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Towards a New Model for Early Warning Signals for Systemic Financial Fragility and Near Crises: An Application to OECD Countries
… crisis highlighted the failure of former early warning signals models. This research attributes this partly to dependent variable specification, independent variable specification, model empirical design, and looking at models in isolation (different empirical methodologies and macro and micro …
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Using signal detection theory to model the detection of warning signals in normal and hearing-impaired listeners while wearing hearing protection
… loss is capable of hearing an auditory alarm or warning is an extremely important industrial safety issue. International standard ISO 773 1—1986(E), Danger Signals for Work Places — Auditory Danger Signals, requires that any auditory alarm or warning be audible to all individuals in the …
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Non-linear dynamics and critical transitions in neonatal brain
… is a `critical transition'. Classical early warning signals, such as increased variance and autocorrelation, have proven to be robust measures for the detection and prediction of critical transitions in many different scenarios. In this study, we examine whether these classical early warning …
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Pulse rate, pulse pattern, and onset distance effects on subject braking responses while using an auditory collision warning signal
… distance had on the performance of an auditory warning signal. The warning signal's purpose was to alert mobile crane operators of their proximity to overhead power lines. The study consisted of two experimental phases. The first phase consisted of three sections; A) development and construction …
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Spatio-temporal dynamics before population collapse
… extended yeast populations to evaluate early warning signals based on spatio-temporal fluctuations. We found that indicators based on fluctuations increased before collapse of connected populations; however, the magnitude of increase was smaller than that observed in isolated populations, as …
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Automatic Control of Chemical Application Rate With Soil Organic Matter and Travel Speed as Inputs (Microprocessor, Digital Control)
… operating parameters and gave appropriate warning signals.
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Effect of Signalization and Temporal Predictability Upon Electrical Brain Stimulation Preference in the Rat.
… is the finding that there is no preference for signals when extremely brief shocks were used (Perkins et. al., 1966), and that subjects will tolerate more intense, longer, or more frequent shocks in order to receive warning signals (Badia, Culbertson, and Harsh, 1973; Badia, Coker, and Harsh, …
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The Effect of Aposematic Coloration on the Food Preference of Aphelocoma coerulescens, the Florida Scrub Jay
… observed in noxious organisms, serves as a warning to predators to avoid attacking specific prey. This coloration is conspicuous in nature, with one of the most common examples being a red and black pattern. The plant Abrus precatorius exhibits this warning signal in its seeds, which …
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Information, women's health and development : strategies for information provision in Africa
… protect themselves against AIDS, what the early warning signals of breast and cervical cancer are, and how best to look after their children and the community at large. The study further argues that these types of challenges can only be met with an efficient and effective health information …
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Disarmament, demobilization, and reintegration of FARC: a challenge for Colombia and a step toward andean region stability
The intention of this thesis is to determine the warning signals and preventive actions to conduct the Fuerzas Armadas Revolucionarias de Colombia (FARC) Disarmament, Demobilization and Reintegration (DDR) process successfully. Although Colombia has experienced multiple DDR processes during its …
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An analysis of organizational vision and mission statements with a focus on Eastman Chemical Company
… The ability to pick up on and act on "early warning signals" that threaten the firm's core capabilities, its competitiveness, and stakeholder satisfaction are critical for success.
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Evaluation and Installation Guidelines for Advance Warning Signal Systems in Utah
Advance warning signals (AWS) provide information warning drivers in advance of the end-of-green phase for an approaching signalized intersection. The purpose of this research was to develop guidelines for the placement of AWS in Utah, both conditions to evaluate the need for AWS installation and …
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Designing Machine Learning Models to Predict Financial Distress in NYSE and NASDAQ Companies
… governance indicators with manipulation-linked signals, demonstrating how strain theory enhances interpretability beyond predictive accuracy. The third paper extends the framework by positioning corporate governance characteristics as early-warning signals of manipulation-linked distress, …
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Effect of Sound Cue Frequency Filters on Front/Back Localization Performance for Three-Dimensional Verbal and Non-Verbal Warnings
… more demands are placed on the human operator, warnings have become an important part of display design. Although warnings have made a significant contribution to safety, problems still plague their design. Recent technological advances have been able to give sounds and warnings a …
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Development and validation of a driver distraction alert system for highway driving using a truck driving simulator
… distraction alert system that can generate early warning signals and prevent vehicle accidents. The proposed system is applied to a truck driving simulator by monitoring the driver response through the steering wheel and accelerator pedal during different driving experiments. In order to ensure an …
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