Self-Directed Work Teams (SDWT) are strategic organization designs based on the belief that the time required to make good decisions decreases when employees are empowered to tap their tacit job knowledge. Because this strategy requires employees to think differently about the way they perform their jobs, the supervisor plays a critical role in SDWT implementations. If leaders fail to adequately manage the challenges associated with the transition to the SDWT structure, employee commitment towards the team and organization at large may suffer, putting the realization of SDWT benefits at risk. To better understand this complicated process, this research describes a field study observation designed to explore the relationship between the constructs of Self-Determination Theory (autonomy, competence, relatedness) with employee affective commitment towards a SDWT transition. Additionally, this research evaluates the mediating role leadership influence tactics has on the relationship between Self-Determination Theory and employee affective commitment towards a SDWT transition.

This thesis consists of an introduction and five papers, of which two contribute to the theory of directed random graphs and three to the theory of greedy walks on point processes.           We consider a directed random graph on a partially ordered vertex set, with an edge between any two comparable vertices present with probability p, independently of all other edges, and each edge is directed from the vertex with smaller label to the vertex with larger label. In Paper I we consider a directed random graph on ℤ2 with the vertices ordered according to the product order and we show that the limiting distribution of the centered and rescaled length of the longest path from (0,0) to (n, [na] ), a<3/14, is the Tracy-Widom distribution. In Paper II we show that, under a suitable rescaling, the closure of vertex 0 of a directed random graph on ℤ with edge probability n−1 converges in distribution to the Poisson-weighted infinite tree. Moreover, we derive limit theorems for the length of the longest path of the Poisson-weighted infinite tree.           The greedy walk is a deterministic walk on a point process that always moves from its current position to the nearest not yet visited point. Since the greedy walk on a homogeneous Poisson process on the real line, starting from 0, almost surely does not visit all points, in Paper III we find the distribution of the number of visited points on the negative half-line and the distribution of the index at which the walk achieves its minimum. In Paper IV we place homogeneous Poisson processes first on two intersecting lines and then on two parallel lines and we study whether the greedy walk visits all points of the processes. In Paper V we consider the greedy walk on an inhomogeneous Poisson process on the real line and we determine sufficient and necessary conditions on the mean measure of the process for the walk to visit all points.

The problem of this study was the effectiveness of directed study as a method of teaching American history at the college level. This method involved the use of small discussion groups, independent reading, and a limited use of special lectures.

This empirical study is aimed at understanding the patterns of relationships among the organization structure of self-managed work teams in terms of three sets of constructs: 1. organization-based self-esteem; 2. consequent behaviors of intrinsic work motivation, general job satisfaction, organization citizenship, and organization commitment; and 3. performance. The primary significance of this study is that it adds to the pool of empirical knowledge in the field of self-managed work team research. The significance of this study to practicing managers is that it can help them make better-informed decisions on the use of the self-managed work team structure. This study was a sample survey composed of five standardized questionnaires using a five-point Likert-type scale, open-ended questions, and demographic questions. Unstructured interviews supplemented the structured survey and for means of triangulation of results. The variables were analyzed using regression analysis for the purpose of path analysis. The site was a manufacturing plant structured around self-managed work teams. The population was full-time, first-line production employees.

This study determined the number of self-directed learning projects undertaken by older adults and examined the motivational factors and anticipated benefits related to the learning activities. In addition, obstacles to conducting self-directed learning were identified by the respondents. A list of 20,032 names of adults, aged 50 or more years and residing in Tom Green County, Texas, was obtained from voter registration rolls and the residential rolls of four retirement complexes. Four hundred names were randomly selected to serve as the sample of the study. Of the 400 potential subjects, 120 persons agreed to be interviewed. Indepth interviews were conducted using the questions from Tough's Interview Schedule for Studying Some Basic Characteristics of Learning Projects and a probe sheet to identify obstacles to conducting self-directed learning projects. The interviews focused on the learning activities of older adults during the previous year. The 120 subjects of this study conducted a total of 239 learning projects in the previous year, an average of 1.99 self-directed learning projects per person. Ninety-five (95%) percent of the persons interviewed reported to have conducted at least one learning project in the past year. The majority of the learning projects were self-planned for the purpose of self-enjoyment and self-fulfillment. The most frequent obstacles to conducting self-directed learning projects identified by the subjects included: 1) finding the time for the learning activity; 2) the cost of the learning activity; 3) home responsibilities; 4) difficulty deciding what knowledge or skill to learn; 5) difficulty remembering new material or information; and 6) poor health. Comparisons of the results of this study were made with the results of previous studies by Tough, Hiemstra, and Ralston. The data support the belief that books, pamphlets, and newspapers are the primary source of information for the older adult. The results of this study indicate that older adults value self-directed learning as a major source of self~fulfillment in their lives and are motivated to develop new knowledge and skills through self-planned, self-directed learning projects.

Health Reimbursement Arrangements (HRAs) and Health Savings Account (HSA) eligible High Deductible Health Plans (HDHPs) emerged as a new health care insurance models referred to as Consumer Directed Health Plans (CDHPs) in the early 2000s. The purpose of this study is to examine the association between enrollees’ prior financial experiences as they relate to health care access and use with plan choice when a Managed Care Preferred Provider Organization (PPO), HRA, and HSA eligible HDHP are offered concurrently in an ESI program. It is important to examine new health insurance structures, such as CDHPs, to better understand their impact on enrollees’ choice of health plan. Factors that determine enrollees’ plan choice can influence the distribution of socio-economic, health risk, and behavioral characteristics across plans. These factors in turn can affect the financial costs, risk pools, and long-term solvency of such plans. The theoretical framework used in this study is adapted from Andersen’s behavioral model and suggests economic enabling resources, self-perceived need for health care, predisposing characteristics, and plan cost characteristics are significant factors in Managed Care verses CDHP choice. First, descriptive statistics are used to describe the enrollee population relative to available plans. Then, multivariate analyses are used to examine hypotheses developed to examine employee earnings, prior Flexible Spending Account (FSA) participation, prior total cost sharing and Relative Risk Scores (RRS). Findings suggest first that CDHPs benefit from favorable selection, however the type of CDHP is a critical factor in the dynamics of plan choice. It is important not to categorize different forms of HRAs and HSA eligible HDHPs generically as CDHPs, but treat them as unique based upon their cost and administrative characteristics. Second, enrollees appear to select a plan that minimizes their future financial exposure based on past ESI experiences. Finally, CDHP choice and enrollee earnings may not have a simple linear relationship as suggested by prior research. Plan choice may depend largely on the dynamics between factors of economic resources, perceived need, and plan cost characteristics.

In this qualitative case study, self-directed learning theory was used as the lens to explore experiences of nine women entrepreneurs during the first four years of business ownership as they sought to acquire skills necessary to run their businesses. Data were collected over six months through in-person 90-minute interviews and follow-up questions posed by telephone and email. Qualitative data software was used for coding and thematic analysis, resulting in five broad conclusions related to learning, with additional unanticipated findings. Study participants engaged in a variety of self-directed learning activities, mostly through trial and error experimentation, and possessed varying motivations for learning. Educational level and reliance on past industry experience limited openness to new experiences and commitment to learning for some, particularly those with high school degrees or limited college experience. The majority of learning was pursued “just-in-time” as the need mandated when a challenge presented itself rather than in a pre-planned manner. Learning was heavily reliant on other people: most sought the advice of paid professionals, former co-workers, or friends and family. The use of a mentor for learning was identified by one participant, while three employed business coaches for professional guidance. Much of their learning was highly instrumental in nature, focused on here-and-now problem solving related to managing employees, handling legal issues in establishing the business, and learning to market themselves. While extremely self-confident in their abilities, most of the women struggled with issues of family and work-life balance, and several described guilt over neglecting one aspect of their lives for the other. Study conclusions emphasize the importance of knowing how to learn in the entrepreneurial context and suggest ways entrepreneurs can access knowledge and new experiences for learning, with implications for entrepreneurship programs, government agencies, and educators.

The theory of self-leadership is gaining credibility and support in the era of globalisation and knowledge workers. As with many leadership theories, culture has been proposed to have a major impact on leadership processes. The purpose of this study was to determine the extent that self-leadership is correlated with national culture dimensions. Self-leadership was measured through the Revised Self-Leadership Questionnaire developed by Houghton and Neck (2002). The cultural values were measured through the use of Hofstede’s Value Survey Module 94 (VSM94). Hypotheses were formed regarding relationships between national culture background and Self-leadership practice. Pearson r, Chi-square test with cross tabulation and multiple regression were used to determine the associations. The results from the statistical tests showed associations between national culture values and self-leadership dimensions. PDI and UAI showed a positive relationship with visualising successful performance but a negative relationship with self-talk both aspects of constructive thought pattern strategies. MAS had a positive relationship with self-talk while negatively correlated to visualising successful performance. IDV had positive relationships with behaviour-focussed strategies, natural reward strategies and constructive thought pattern strategies. Long-term orientation had a strong negative relationship with behaviour-focussed and natural reward strategies and a very weak negative association with behaviour focussed strategies. / Graduate School of Business Leadership / M.B.L.

As a first step to producing a shape selective catalysts or enzyme mimic, two preorganized host molecules were synthesized. Binding studies of the two hosts with a variety of guests in three solvents demonstrated that an important driving force in the association was the formation of C-H???X-R hydrogen bonds (X = halogen). A deuterated host was utilized to further examine the formation of the C-H???X-R hydrogen bonds. In an effort to place functionality in the hydrophobic pocket of these hosts, two methods were developed. The first utilized directed ortho metallation to place electrophiles above and/or directed into the cavity. Perlithiation of the host could lead to sixty-nine products but reaction conditions and host rigidity limited product formation. This reaction technique led to the placement of carboxylic acid groups onto the host and the isolation of twelve products. Two different positions of the carboxylic acids (endoand exo-) direct the orientation of the guest. 1D- and 2D-NMR were utilized to examine how the was orientated inside the host. The second method employed to place functionality on the host, sited a tripodal zinc binding ligand on the side of the hydrophobic pocket of the host. The synthesized host was able to bind zinc strongly and in a 1:1 manner.

Recent years have seen tremendous developments in methods for computational modeling of (bio-) molecular systems. Ever larger reactive systems are being studied with high accuracy approaches, and high-level QM/MM calculations are being routinely performed. However, applying high-accuracy methods to large biological systems is computationally expensive and becomes problematic when conformational sampling is needed. To address this challenge, classical force field based approaches such as free energy perturbation (FEP) and empirical valence bond calculations (EVB) have been employed in this work. Specifically: Force-field independent metal parameters have been developed for a range of alkaline earth and transition metal ions, which successfully reproduce experimental solvation free energies, metal-oxygen distances, and coordination numbers. These are valuable for the computational study of biological systems. Experimental studies have shown that the epoxide hydrolase from Solanum tuberosum (StEH1) is not only an enantioselective enzyme, but for smaller substrates, displays enantioconvergent behavior. For StEH1, two detailed studies, involving combined experimental and computational efforts have been performed: We first used trans-stilbene oxide to establish the basic reaction mechanism of this enzyme. Importantly, a highly conserved and earlier ignored histidine was identified to be important for catalysis. Following from this, EVB and experiment have been used to investigate the enantioconvergence of the StEH1-catalyzed hydrolysis of styrene oxide. This combined approach involved wildtype StEH1 and an engineered enzyme variant, and established a molecular understanding of enantioconvergent behavior of StEH1. A novel framework was developed for the Computer-Aided Directed Evolution of Enzymes (CADEE), in order to be able to quickly prepare, simulate, and analyze hundreds of enzyme variants. CADEE’s easy applicability is demonstrated in the form of an educational example. In conclusion, classical approaches are a computationally economical means to achieve extensive conformational sampling. Using the EVB approach has enabled me to obtain a molecular understanding of complex enzymatic systems. I have also increased the reach of the EVB approach, through the implementation of CADEE, which enables efficient and highly parallel in silico testing of hundreds-to-thousands of individual enzyme variants.