Dissertation com mär 2005 (4 Ergebnisse)
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Taschenbuch. Zustand: Neu. Neuware - The primary objective of this study is to determine whether practicing personnelists and research scholars agree on what constitutes an effective performance appraisal system in public safety organization. If Personnel managers at public safety organization possess knowledge of the characteri…stics of effective performance appraisal system in public safety organizations, they are more likely to design and/or advocate performance appraisal system in public safety organizations that include these important attributes. In addition, the research is an opportunity for the academic community to learn from the experience of practitioners. Concepts and techniques that are valued by academics may not be functional or effective for those involved in the development and administration of performance appraisal system in public safety organizations. Thus, areas of disagreement can serve to identify subjects for further research and improve both theory and practice.
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Taschenbuch. Zustand: Neu. Neuware - Software developer turnover can have disastrous effects on an organization due to the loss of business process knowledge, as well as acquired technical skills. Annual rates of turnover in information technology (IT) departments have been estimated at 20% or more with the cost of replacing tec…hnology workers ranging from 1.5 to 2.5 times annual salaries. This study purposely focused only on software developers as opposed to IT employees in general due to the critical nature of their work.The factors leading to turnover intention in this field are poorly understood; therefore, this study was designed to further understand the relationships between job characteristics, job satisfaction, and turnover intention among software developers. 326 web surveys were completed that contained questions relating to job characteristics, job satisfaction, turnover intention, and demographic information. The first four job characteristics are specific to software developers while the last five job characteristics and the job satisfaction scales are from the Hackman and Oldham Job Diagnostic Survey (JDS).Two research questions, sixteen hypotheses, and a theoretical path model were developed to understand which job characteristic variables contribute to the various dimensions of job satisfaction and which job satisfaction dimensions contribute to turnover intention. Additionally, the indirect effects of job characteristics through job satisfaction on turnover intention were also determined. The statistical testing consisted of descriptive and inferential statistical analysis. Bivariate correlations are presented, as well as path analysis, an extension of multiple regression analysis.The results of the study uncovered several factors that can influence turnover intention among software developers. Identified in the study as statistically significant job characteristics that can be influenced by management are training, autonomy, feedback, number of developers, task significance, and skill variety. With the results of this study, management can better understand the unique needs of software developers and design development jobs to ensure that these needs are met. The study concludes with implications for practitioners and recommendations for future research.
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Taschenbuch. Zustand: Neu. Neuware.
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Taschenbuch. Zustand: Neu. Neuware - This dissertation proposes a computational technique for automated 'invention' of conceptual schemes of thermal systems. The input provided to the automated problem solver is a description of the streams entering and leaving the system. The output is a network of elementary processes: compres…sion, expansion, heating, cooling, and chemical processes. The problem solver seeks a network that is feasible, and offers an optimal (or at least favorable) combination of energy and capital costs. The synthesis process is modeled as a heuristic search conducted in a state-space of all possible design versions. The main ideas of the dissertation have been implemented in a computer program called TED, which invented a number of nontrivial schemes.TED starts with an initial state (or states), which may be either proposed by the user or generated automatically. TED evaluates each state using a special technique of exergy analysis applied to an infinitesimal temperature interval. This allows us to describe the thermal system by several integral characteristics which are functions of temperature. One particularly important integral characteristic - a measure of system's Second Law infeasibility - is introduced in this work; it allows a uniform treatment of both feasible and infeasible design states.TED then selects the most promising of the available designs. This selection is guided by a specialized search algorithm BP\* which is shown to be probabilistically admissible. The results of the exergy analysis are used to perform a look-ahead evaluation of the design states. BP\* also uses backpropagation of the state evaluation function to reduce the amount of backtracking.TED then improves the selected design by applying one of the transforming operators and thereby generating a new design. Each transformation involves addition of an incremental network of thermal processes to the original state and reduces either irreversibility (exergy loss) or infeasibility of the thermal system. The application of the transformations is controlled by a heuristic move generation function that selects the most promising transformations. The new design is added to the database of the available design states.The search continues with these evaluate-select-transform iterations until an (approximately) optimal design is found.
