Theses (M.S.)--Ohio University, June, 1980. / Title from PDF t.p.

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A digital motor controller for student lab use is designed, built, and tested. The controller uses an encoder for position measurement, and an H-bridge to drive the electromechanical plant. A user interface is created to enhance usability of the device. The user interface is able to display key parameters of the control algorithm as well as the state of the system. It is also used to modify the gains and sample rate of the control algorithm. The design of the system is refined, and 10 units are built for the EE472 Digital Controls Lab. The lab manuals for the first 4 experiments are revised to match and support the new system. The possible future for the project is described with some suggestions for improving the system.

In recent years, multi-robot systems have been widely used in many applications such as warehouse inventory tracking and automatic search and rescue operations. Probability roadmap (PRM) is a typical path planning algorithm that can determine an optimal trajectory once the robot start and goal positions are specified. However, when the number of robots in the system increases, it converges slowly and may even fail to find the solution. In this thesis, a fuzzy inference system is proposed and combined with the probability roadmap algorithm for robot path planning. Computer simulation results in five different environments show this approach is very effective to reduce computation cost in most cases for multi-robot systems of various sizes. It is able to reduce the number of collision checks by at least 27% with a trade off of increased average path length of 12% at the most. It is also noticed that the proposed fuzzy system is not advantageous when combined with the sub-dimension expansion algorithm. More research will be conducted in the future to further improve the performance of the proposed fuzzy inference system.

Apex-Adams-Simulink co-simulation is applied to active magnetic bearing (AMB) rotors, demonstrating results unshown in literature, including continuous frequency response, and unavailable in known rotor dynamics software, including touchdown bearing impact. AMBs levitate rotors without contact, so they involve no friction, wear, lubrication, pollution, or shaft speed limits and are thus valuable for large, high-speed applications. Modeling of such rotors, necessary for safety and performance, simultaneously requires flexible body dynamics and advanced control design, but simulation programs tend to specialize in only one or the other. The co-simulation method combines multiple such programs—MSC Apex (finite element modeling), Adams (multibody dynamics), and Simulink (graphical control design) with MATLAB (visualization tools)—expanding the design space for AMB rotor modeling beyond that of available commercial software. In this work, accuracy of co-simulation to theory is validated through a rigid AMB rotor and a hanging disk on a steel wire, and new results are shown for a flexible anisotropic rotor and a simplified touchdown bearing impact test.

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2 pp. / The first sign of a potential alfalfa caterpillar (Colias eurytheme) outbreak is the influx of large numbers of yellow or white butterflies in late spring or early summer. This publication discusses the biology of the alfalfa caterpillar, the damage it causes, the biological and cultural controls, and the treatments for it.

Thesis (Ph. D.)--University of Texas at Austin, 2003. / Vita. Includes bibliographical references. Available also from UMI Company.

While a significant amount of research has examined the more traditional budgetary and procedural controls used by governments to maintain control over social security expenditure, very little research has examined the more obscure formal social controls used to achieve the same purpose. The primary aim of this study was to fill this research vacuum by examining both the formal and informal mechanisms used by governments to maintain control over social security expenditure and to achieve longer-term public policy appropriation. In particular the study focused on the payment of Job Newstart and Youth Allowances and how the social control discourse of marginalisation was used to achieve such control. The study was undertaken in two stages. In stage one, an e-mail questionnaire was distributed to Job Network consultants (n = 739) employed at 66 not-for-profit Job Network Providers throughout Australia. In stage two, focus group interviews were conducted to expand on the responses previously obtained from the e-mail questionnaire survey. The study produced several significant findings from the views of Job Network consultants. Most significantly the results support Foucault's discourse on marginalisation. That is the results help to explain how consultants identify and single out people who do not fit the norm and therefore represent a case for special treatment. The effect of this marginalisation process is that governments are able to assert power and authority over welfare claimants and that the process is justified from the government's viewpoint. It would also seem that society and the individual accept such institutional arrangements. The techniques of marginalisation are disciplinary in their nature and relate to the multiplication of social security rules and procedures and a correlative division of the claimant population in accordance with constitutive criteria of status and entitlement. The study also concluded that Job Network consultants recognised that the breaching regime should be modified longer-term to take account of the i nformal ethical and moral criteria of fairness, justice and the rights of individuals. Having said this however, the same group of consultant's indicated in very strong terms that recipients' of Newstart and Youth Allowances should comply with their mutual obligation requirements and that they should be penalised in those instances where they do not comply with these requirements.