Thesis (Ph. D.)--Rand Graduate School, 2002. / Includes bibliographical references (p. 64-70). Also available online.

Thesis (M.S.)--University of Michigan, 1995.

Thesis (Ph. D.)--Rand Graduate School, 2002. / Includes bibliographical references (p. 64-70).

Switchgrass (Panicum virgatum L.) is a cellulosic feedstock for alternative energy production that could grow well between planted pines (Pinus spp.). Southeastern planted pine occupies 15.8 million hectares and thus, switchgrass intercropping could affect biodiversity if broadly implemented. Therefore, I evaluated effects of intercropping switchgrass in loblolly pine (P. taeda L.) plantations on plant community diversity, plant biomass production, and white-tailed deer (Odocoileus virginianus Zimmerman) nutritional carrying capacity. In a randomized complete block design, I assigned three treatments (switchgrass intercropped, switchgrass monoculture, and a “control” of traditional pine management) to 4 replicates of 10-ha experimental units in Kemper County, Mississippi during 2014-2015. I detected 246 different plant species. Switchgrass intercropping reduced plant species richness and diversity but maintained evenness. I observed reduced forb and high-use deer forage biomass but only in intercropped alleys (interbeds). Soil micronutrient interactions affected forage protein of deer plants. White-tailed deer nutritional carrying capacity remained unaffected.

The purpose of this study was to determine case managers’ understanding of their role in a managed care organisation and to develop recommendations for the improvement of case management practice. Quantitative descriptive research was conducted to explore perceptions of case managers regarding their role. A self-administered questionnaire was used as a formal data collection instrument and 25 respondents participated in the study. The findings revealed that the majority of case managers know what is expected of them in their job but that they do experience some barriers. There appears to be uncertainty with quite a number of respondents regarding certain aspects of their role. Recommendations were made for improved case management practice.

The main aim of this research study was to explore attraction factors pertaining to the literature and to the occupational context of nursing personnel who have exhibited employment interest in a managed care organisation. A qualitative research approach was adopted in which semi-structured interviews were held to collect rich exploratory data from the purposeful sample of nine applicants with nursing qualifications. Twenty-five themes were identified through interpretive data analysis as being important factors in the pre-interview attraction process. The highest ranking of these were identified to be opportunities for professional and personal growth and the relationship with the managed care client, followed by salary and working hours. This study contributes knowledge to Personnel and Career Psychology in the field of Industrial and Organisational Psychology and is pertinent to organisations recruiting nurses, advising them in the formulation of contextually appropriate attraction strategies that attend to the most notable attraction factors / Industrial & Organisational Psychology / M.Com. (Industrial and Organizational Psychology)

This study offers insights into the impact of competition among Managed Care organizations (MCOs) on infant birthing charges and birth outcomes. Kentucky provides one of the nation’s first case studies to determine successes and failures of Medicaid MCOs, and by doing so, provides a prediction of the impact of Patient Protection Affordable Care Act (PPACA) competition on healthcare costs and birth outcomes. An analysis of a natural policy experiment in the state of Kentucky reveals that infants insured by a Medicaid MCO stay longer in hospitals, are less healthy, and cost more than those insured under Traditional Medicaid prior to a policy change. Utilizing a difference-in-difference-in-difference (DDD) estimation, this study found initial evidence in a competitive MCO environment of Traditional Medicaid average birth charges substantially more than births under a Medicaid MCO, while outcomes also revealed the incidence of normal delivery increased almost identical to that of private insurance. However, after a short time, average birth charges for infants born under Medicaid MCO climb higher than other payer-types and infant health begins to decline. Outcomes of this study signal that Managed Care infants are actually less healthy and cost substantially more than anticipated but it is possible that these outcomes can be attributed to insurance selection.

The purpose of this study was to determine case managers’ understanding of their role in a managed care organisation and to develop recommendations for the improvement of case management practice. Quantitative descriptive research was conducted to explore perceptions of case managers regarding their role. A self-administered questionnaire was used as a formal data collection instrument and 25 respondents participated in the study. The findings revealed that the majority of case managers know what is expected of them in their job but that they do experience some barriers. There appears to be uncertainty with quite a number of respondents regarding certain aspects of their role. Recommendations were made for improved case management practice.

The implementation of managed lanes (MLs), also known as dynamically priced express lanes, to improve freeway traffic flow and personal throughput is on the rise. Congestion pricing is increasingly becoming a common strategy for congestion management, often requiring microscopic simulation during both planning and operational stages. VISSIM is a recognized microscopic simulation software used for analyzing the performance of managed lanes (MLs). This thesis addressed two important microscopic simulation issues that affect the evaluation results of MLs. One of the microscopic simulation issues that has not yet been addressed by previous studies is the required minimum managed lane routing decision (MLRD) distance upstream of the ingress point of MLs. Decision distance is an optimal upstream distance prior to the ingress at which drivers decide to use MLs and change lanes to orient on a side of MLs ingress. To answer this question, this study used a VISSIM model simulating I-295 proposed MLs in Jacksonville, Florida, United States (U.S), varying the MLRD point at regular intervals from 500 feet to 7,000 feet for different levels of service (LOS) input. Three measures of effectiveness (MOEs) - speed, the number of vehicles changing lanes, and following distance - were used for the analysis. These MOEs were measured in the 500 feet zone prior to the ingress. The results indicate that as the LOS deteriorates, speed decreases, the number of vehicles changing lanes increases, and the following distance decreases. When the LOS is constant, the increase in the MLRD distance from the ingress point was associated with the increase in the speed at the 500 feet zone prior to the ingress, less number of lane changes, and the increase in following vehicle gap. However, the MOEs approached constant values after reaching a certain MLRD distance. LOS D was used to determine the minimum MLRD distance to the ingress of the MLs. The determined minimum MLRD distances were 4,000 and 3,000 feet for 6 and 3 lane segments prior to the ingress point, respectively. Another issue addressed in this thesis is the managed lane evaluation (MLE) outputs, which include speed, travel time, density, and tolls. In computing the performance measures, the existing VISSIM managed lane evaluation (EVMLE) tool is designed to use the section starting at the point when vehicles are assigned to use MLs, also known as the MLRD point, which is located upstream of the ingress. The longer the MLRD distance from the ingress, the more the EVMLE tool uses the traffic conditions of the MLs traffic before entering the ML in its computations. This study evaluates the impact of the MLRD distance on the EVMLE outputs and presents a proposed algorithm that addresses the EVMLE shortcomings. In order to examine the influence of the MLRD distance on the outputs of the above-mentioned two algorithms, simulation scenarios of varying MLRD distances from 500 ft to 7,000 feet from the ingress were created. For demonstration purposes, only the speed was used to represent other performance measures. The analysis of variance (ANOVA) test was performed to determine whether there was a significant difference in the speed results with the change in the MLRD distance. According to the ANOVA results, the EVMLE tool produced ML speeds that are MLRD dependent, yielding lower speeds with an increased MLRD distance. On the other hand, the ML speed results from the proposed algorithm were fairly constant, regardless of the MLRD distance.

The main aim of this research study was to explore attraction factors pertaining to the literature and to the occupational context of nursing personnel who have exhibited employment interest in a managed care organisation. A qualitative research approach was adopted in which semi-structured interviews were held to collect rich exploratory data from the purposeful sample of nine applicants with nursing qualifications. Twenty-five themes were identified through interpretive data analysis as being important factors in the pre-interview attraction process. The highest ranking of these were identified to be opportunities for professional and personal growth and the relationship with the managed care client, followed by salary and working hours. This study contributes knowledge to Personnel and Career Psychology in the field of Industrial and Organisational Psychology and is pertinent to organisations recruiting nurses, advising them in the formulation of contextually appropriate attraction strategies that attend to the most notable attraction factors / Industrial and Organisational Psychology / M.Com. (Industrial and Organizational Psychology)