京都大学 / 0048 / 新制・論文博士 / 博士(医学) / 乙第13061号 / 論医博第2119号 / 新制||医||1018(附属図書館) / (主査)教授 羽賀 博典, 教授 妹尾 浩, 教授 戸井 雅和 / 学位規則第4条第2項該当 / Doctor of Medical Science / Kyoto University / DFAM

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A total of 320 rats were employed in experiments analyzing the phenomenon of disinhibition of an operant bar-pressing response. The parameters explored were type of "inhibitory operation" preceding the test for disinhibition, and modality, duration, directionality, intensity, and prior exposure to the disinhibiting stimulus. The disinhibition phenomenon was highly general, occurring under almost all test conditions. The phenomenon, however, could be produced during extinction only when probability of response was at a "critical" low, but greater than zero, level. When animals with the same "critical" response probability were tested during acquisition, before bar-pressing had reached a higher level of probability, disinhibition never occurred. Theories attempting to account for both the inhibiting and disinhibiting effects of extraneous stimuli were examined. / Thesis / Doctor of Philosophy (PhD)

Ionic polymer transducers comprise a class of active material that exhibit interesting chemoelectromechanical coupling capabilities. With the ability to convert energy between chemical, electrical and mechanical domains, these materials offer potential for use in numerous engineering applications. The research presented in this dissertation focuses primarily on the electromechanical coupling that exists within these ionic polymer materials. When plated with a conductive surface electrode, these ionomeric membranes function effectively as either sensors or actuators. Mechanically compliant, these transducers demonstrate large strain, but limited force, capabilites while operating at low excitation voltages. The objective of this research is to improve understanding of the transduction properties inherent in the ionic polymer. Most of the existing work in this area has focused on the actuation response, therefore the focus of this research is on providing a better understanding of the sensing and impedance responses of the ionic polymer transducer. Using transport theory as the basis, a set of analytical models are developed to characterize the charge motion that develops within an ionomer when subject to either mechanical or electrical loading. These models characterize the internal potential and charge density responses of the membrane, as well as the expected surface current that would be measured as the result of external loading. In addition to the analytical work, numerous experimental characterizations of the membrane are also presented. The ionic polymer's actuation, sensing and impedance responses are each considered as a function of the counterion and solvent type present within the ionic polymer. These studies demonstrate the importance of the ionomer's impedance response in understanding the electromechanical capabilites of an ionic polymer transducer. Most sample-to-sample variation can be attributed to the voltage to current conversion that occurs within the ionic polymer. By relating these experimental results to the analytical models, it is possible to characterize these changes in performance in terms of the effective diffusion and permittivity parameters of the transducer. A final series of experiments are also considered to determine the effectiveness of the model in predicting the impedance response as a function of temperature, solvent viscosity and preloading of the membrane. / Ph. D.

No / Surveys are a common method of data collection within health service research. An essential aspect of reporting survey research is ensuring that sufficient information is provided to enable readers to determine the validity and representativeness of research findings. Method This study reports a secondary analysis of survey research published in Radiography and Clinical Radiology between 2001 and 2010. The purpose of the study was to evaluate trends in response rates and establish how non-response bias was being addressed. Results Analysis of non-response bias was undertaken in 9.4% (n = 9/96) of studies. Where analysis was performed, strong reliance on demographic characteristics to determine sample representativeness was noted (n = 8/9; 88.9%). Conclusion The findings of this study suggest that non-response bias is not being adequately addressed within published imaging related survey research and more needs to be done to encourage a rigorous approach to the analysis and reporting of survey results.

The objective of this research work was to develop a design tool to analyze and design undamped beam and rotor systems in two dimensions. Systems modeled in two dimensions, such as beams with different moments of inertia, could produce varying responses in the each direction of motion. A coupling between the vertical and horizontal motions also exists in rotor systems mounted of fluid film bearings. The computer program called 2DBEAM has been developed to model and provide analyses of such systems in two dimensions. The tool has been based on an existing design package, BEAM9, which in its present state provides the response of beams and rotors in one plane of motion. The 2DBEAM program has the capability of performing the static response, free vibration, forced dynamic response, and frequency response analyses of a system. The Transfer Matrix Method has been used in the development of the software and an explanation of the method is included in this thesis. Mathematical problems and solutions encountered while developing 2DBEAM are also documented in this study. The code has been tested against analytical and published solutions for the types of analysis mentioned above and on coupled and uncoupled system models. / Master of Science