Doctor of Philosophy

dissertationDetailed clinical models (DCMs) are the basis for retaining computable meaning when data are exchanged between heterogeneous computer systems. DCMs are also the basis for shared computable meaning when clinical data are referenced in decision support logic, and they provide a basis for data consistency in a longitudinal electronic medical record. Intermountain Healthcare has a long history in the design and evolution of these models, beginning with PAL (PTXT Application Language) and then the Clinical Event Model, which was developed in partnership with 3M. After the partnership between Intermountain and 3M dissolved, Intermountain decided to design a next-generation architecture for DCMs. The aim of this research is to develop a detailed clinical model architecture that meets the needs of Intermountain Healthcare and other healthcare organizations. The approach was as follows: 1. An updated version of the Clinical Event Model was created using XML Schema as a formalism to describe models. 2. In response to problems with XML Schema, The Clinical Element Model was designed and created using Clinical Element Modeling Language as a formalism to describe models. 3. To verify that our model met the needs of Intermountain Healthcare and others, a desiderata for Detailed Clinical Models was developed. 4. The Clinical Element Model is then critiqued using the desiderata as a guide, and suggestions for further refinements to the Clinical Element Model are described

A study of the mechanism of the reaction between styrene and tung oil

It is the purpose of this thesis to study the possible mechanisms by which styrene may react with tung oil. To this end, styrene is reacted with tung oil, using a peroxide catalyst, the reaction product is separated into its components, and a preliminary analysis of these components is made, in an attempt to determine whether the reaction occurs through a Diels-Alder or a co-polymerization type mechanism

The Application of Multi Frequency Resonant Controllers in in a DFIG to Improve Performance by Reducing Unwanted Power and Torque Pulsations and Reducing Current Harmonics.

The paper describes a method to control the rotor-side and grid side converters in a DFIG when subjected to the effects of network voltage unbalance conditions. Multi Frequency Resonant Controllers are incorporated into the grid side and rotor side converters to assist in the control functions. The Resonant Controllers are tuned to twice the network frequency to assist in the control of power and torque pulsations and to three times the network frequency to assist in the control of the generated third harmonic currents. A DFIG model is implemented in Matlab/Simulink and simulations show the reduction in power and torque oscillations and a reduction in the 3rd harmonic currents generated as a result of the applied voltage unbalance

Contract as Swag

In the past, legal scholars have analogized the contract to a product, a social artifact, and a form of technology. In this Article, we suggest that contracts may also be usefully analogized to swag. The term “swag” refers to branded merchandise that is given away for free to people who attend or participate in an event. Companies and law firms increasingly give away contracts—and specific contract provisions—to contract users with the goal of enhancing their reputations. In so doing, they deploy their contracts in a manner that resembles a water bottle or tote bag emblazoned with the name of a law firm. There are a number of benefits that flow from conceptualizing contracts as a form of swag. First, the analogy helps to explain why lawyers would invest time and energy in developing contract innovations that are ineligible for formal intellectual property protections. Second, the analogy provides important insights into how and why some contractual innovations become widely known in the years after their creation while others languish in obscurity. Third, and finally, the analogy highlights the futility in attempting to develop an all-encompassing theory of contractual innovation

Analysis of Compensation Techniques Applied to the Control of Converter Connected Synchronous Wind Turbines and DFIG’s During Grid Disturbances.

This paper investigates control schemes to improve the performance of converter connected synchronous generators and DFIG’s to grid voltage unbalance and grid faults. Both the synchronous generator with a full converter and a DFIG are modelled in Matlab/Simulink. The control schemes of both turbines are modified to improve their performance during grid disturbances including grid voltage unbalance and single-phase faults. These disturbances are introduced into the models at specific times to analyse the performance of the wind generation systems. The performances of both systems to the grid disturbances are compared and the results are analysed

The Control of Rotor Side and Grid Side Converters in a DFIG During Network Voltage Unbalance Conditions Using Resonant Current Controllers.

This paper implements control techniques to enable improved operation of DFIG’s when subjected to the effects of network voltage unbalance conditions. The control scheme involves the integration of a resonant regulator into the PI controllers of both the rotor side and grid side converters in a DFIG. The resonant controller is tuned to twice the network frequency (2ωe) and designed to mitigate against the oscillations in a DFIG due to network voltage unbalance conditions. The grid side converter controller also incorporates a second resonant controller tuned to three times the grid frequency (3ωe) to alleviate the amplitude of the generated third harmonic currents. The control schemes of both the rotor side and grid side converters are coordinated to enable concurrently reductions in both the torque pulsations and the total DFIG power oscillations. A DFIG model is implemented in the program Matlab/Simulink and simulations show the reduction in power and torque oscillations and a reduction in the high unbalanced currents generated as a result of the applied voltage unbalance

Analysis of Converter Connected Synchronous Wind Turbines to Grid Disturbances.

This paper investigates the performance of synchronous generators to grid voltage unbalance and grid faults. A Model of a synchronous generator with a full converter is implemented in the SimPowerSystems toolbox in Matlab/Simulink. Methods to modify the converter control schemes to improve the synchronous generator systems response to grid voltage unbalance and grid faults are investigated. Grid faults including grid voltage unbalance, and line-to-ground faults are introduced into the model at specific times to analyse the performance of the wind generation system. Improvements in the performance of the synchronous generator WECS to the grid disturbances are illustrated

The Application of Multi Frequency Resonant Controllers in in a DFIG to Improve Performance by Reducing Unwanted Power and Torque Pulsations and Reducing Current Harmonics.

The paper describes a method to control the rotor-side and grid side converters in a DFIG when subjected to the effects of network voltage unbalance conditions. Multi Frequency Resonant Controllers are incorporated into the grid side and rotor side converters to assist in the control functions. The Resonant Controllers are tuned to twice the network frequency to assist in the control of power and torque pulsations and to three times the network frequency to assist in the control of the generated third harmonic currents. A DFIG model is implemented in Matlab/Simulink and simulations show the reduction in power and torque oscillations and a reduction in the 3rd harmonic currents generated as a result of the applied voltage unbalance