<p>This thesis presents empirical research in the field of software development with a focus on handling semantic aspects. There is a general lack of empirical data in the field of software development. This makes it difficult for industry to choose an appropriate method for their particular needs. The lack of empirical data also makes it difficult to convey academic results to the industrial world.</p><p>This thesis tries to remedy this problem by presenting a number of empirical evaluations that have been conducted to evaluate some common approaches in the field of semantics handling. The evaluations have produced some interesting results, but their main contribution is the addition to the body of knowledge on how to perform empirical evaluations in software development. The evaluations presented in this thesis include a between-groups controlled experiment, industrial case studies and a full factorial design controlled experiment. The factorial design seems like the most promising approach to use when the number of factors that need to be controlled is high and the number of available test subjects is low. A factorial design has the power to evaluate more than one factor at a time and hence to gauge the effects from different factors on the output.</p><p>Another contribution of the thesis is the development of a method for handling semantic aspects in an industrial setting. A background investigation performed concludes that there seems to be a gap between what academia proposes and how industry handles semantics in the development process. The proposed method aims at bridging this gap. It is based on academic results but has reduced formalism to better suit industrial needs. The method is applicable in an industrial setting without interfering too much with the normal way of working, yet providing important benefits. This method is evaluated in the empirical studies along with other methods for handling semantics. In the area of semantic handling, further contributions of the thesis include a taxonomy for semantic handling methods as well as an improved understanding of the relation between semantic errors and the concept of contracts as a means of avoiding and handling these errors.</p>

Mining Software Repositories, which is the process of analyzing the data related to software development practices, is an emerging field which aims to aid development teams in their day to day tasks. However, data in many software repositories is currently unused because the data is unstructured, and therefore difficult to mine and analyze. Information Retrieval (IR) techniques, which were developed specifically to handle unstructured data, have recently been used by researchers to mine and analyze the unstructured data in software repositories, with some success. The main contribution of this thesis is the idea that the research and practice of using IR models to mine unstructured software repositories can be improved by going beyond the current state of affairs. First, we propose new applications of IR models to existing software engineering tasks. Specifically, we present a technique to prioritize test cases based on their IR similarity, giving highest priority to those test cases that are most dissimilar. In another new application of IR models, we empirically recover how developers use their mailing list while developing software. Next, we show how the use of advanced IR techniques can improve results. Using a framework for combining disparate IR models, we find that bug localization performance can be improved by 14–56% on average, compared to the best individual IR model. In addition, by using topic evolution models on the history of source code, we can uncover the evolution of source code concepts with an accuracy of 87–89%. Finally, we show the risks of current research, which uses IR models as black boxes without fully understanding their assumptions and parameters. We show that data duplication in source code has undesirable effects for IR models, and that by eliminating the duplication, the accuracy of IR models improves. Additionally, we find that in the bug localization task, an unwise choice of parameter values results in an accuracy of only 1%, where optimal parameters can achieve an accuracy of 55%. Through empirical case studies on real-world systems, we show that all of our proposed techniques and methodologies significantly improve the state-of-the-art. / Thesis (Ph.D, Computing) -- Queen's University, 2012-12-12 12:34:59.854

An organization’s internal processes of identity management is argued to influence its communication, which in turn influence the perceived reputation of the organization. The aim of this study is to investigate how the organizational identity is reflected upon and perceived integrated in employees’ daily work. This is done through applying the internal factors of a theoretical model, comprising of identity, culture and image, at an empirical setting. Literature on organizational identity in relation to organizational culture and organizational image is reviewed followed by conducting 12 semi structured interviews with managers from the marketing and human resource departments at Arla Foods in Sweden. The findings suggest that although employees reflect on the identity, there is a gap between reflection and action, meaning that the identity is not necessarily integrated in practice in the daily work due to different understandings of the organizational culture. In relation to the model, it is suggested that culture may not be so clearly connected to identity, whereas image and identity are very closely related. Also, the context in which the employees conduct their work is shown through the empirical setting, to be important for how employees reflect upon the identity.

The United States acute care hospital (ACH) market provides a unique environment in which to examine questions about market structure and performance. The ACHs operate in a mature market of health services that is highly regulated and has one dominant primary consumer of services. The uncharacteristic industry structure offers the opportunity to analyze pervasive agency relationships and capital structure issues in a new setting. In addition, the policies of the U.S. Government have created an environment in which tacit collusion is likely to flourish, which leads to market buyer power (monopsony, or buyers acting as one monopoly buyer). A key question is the extent to which monopsony and agency affect capital structure decisions. Agency is defined by Ross (1973, p.134) as a relationship formed between a principle and their agents, “when one, designated as the agent, acts for, on behalf of, or as representative for the other, designated the principal, in a particular domain of decision problems.” This thesis extends the agency framework provided by Jensen and Meckling (1976), along with the econometric understanding of monopsony in healthcare via tacit collusion, as suggested by Pauly (1998) and Sevilla (2005), and the research constraints of monopsony under an all-or-nothing contract, as outlined by Taylor (2003). Using data on ACHs from the period of 1995 to 2007 for approximately 5,000 ACHs, which was derived from the Medicare Cost Report and medical payments for a sub-population of 1,500, this research examines the determinants of capital structure in a distorted market. Building upon this initial analysis, the research seeks to examine the effects of market distortions upon free cash flow, and ultimately, capital structure. Two theories of distortion are presented that would affect free cash flow: The first is that of the agency cost of free cash flow and signaling, and the second is a theory of monopsony via tacit collusion between buyers. A model of the agency relationship between ACHs and the U.S. Government is proposed, promoting agency cost (signaling and the agency cost of free cash flows) as a causal relation with free cash flows and capital structure (Jensen & Meckling 1976; Jensen 1986). Empirical models of agency are constructed, examining the dependence on government business and the relation to the leverage (signaling) and free cash flows (agency cost of free cash flows) for ACHs. In addition, a complementary theory of capital structure determinant via market power (monopsony) is formulated, suggesting that monopsony conditions within the ACH market affect free cash flows and capital structure. The analysis provides a framework for understanding the environments in which ACHs operate and the strength of bargaining within the market. The research concludes with a review of the determinants of capital structure in light of the inefficiencies and distortions of the industry and the relationships observed.

Beginning in October 2015, student protests erupted at many U.S. colleges and universities. This wave of demonstrations prompted an ongoing national debate over the following question: what caused this activism? Leveraging existing theoretical explanations, this paper attempts to answer this question through an empirical study of the 73 most prominent college protests from October 2015 to April 2016. I use an original data set with information collected from U.S. News and World Report to determine what factors at these 73 schools were most predictive of the protests. My findings strongly suggest that the probability of a protest increases at larger, more selective institutions. I also find evidence against the dominant argument that the marginalization of minority students exclusively caused this activism. Using my empirical results, this paper presents a new theoretical explanation for the 2015-2016 protests. I argue that racial tensions sparked the first demonstration. However, as the protests spread to other campuses, they were driven less by racial grievances and more by a pervasive culture of political correctness. This paper concludes by applying this new theoretical framework to the budding wave of 2017 protests.

The aim of this paper is to demonstrate whether stakeholders activating a project shape team building, the structure and magnitude of resource investment levels, and to what extent these levels impact ERP project effectiveness. The process view of an ERP project includes project initiation, system justification and funding, implementation, and early system use. Results from a nationwide empirical survey conducted in Austria (N = 88) show that activating actors influence team formation and resource investments, which impact project effectiveness levels. Resource-intensive justification and funding phases tend to precede resource-intensive implementations in heavy-weight projects, which seem to be less effective than light-weight projects. Resource and change conflicts are associated with lower project performance and are more common in resource-intensive ERP projects, where early system use appears to be relatively less stable. (author's abstract)

Almost one-half of the annual precipitation in the southwestern United States occurs during the North American monsoon (NAM). Given favorable synoptic-scale conditions, organized monsoon thunderstorms may affect relatively large geographic areas. Through an objective analysis of atmospheric reanalysis and observational data, the dominant synoptic patterns associated with NAM extreme events are determined for the period from 1993 to 2010. Thermodynamically favorable extreme-weather-event days are selected on the basis of atmospheric instability and precipitable water vapor from Tucson, Arizona, rawinsonde data. The atmospheric circulation patterns at 500 hPa associated with the extreme events are objectively characterized using principal component analysis. The first two dominant modes of 500-hPa geopotential-height anomalies of the severe-weather-event days correspond to type-I and type-II severe-weather-event patterns previously subjectively identified by Maddox et al. These patterns reflect a positioning of the monsoon ridge to the north and east or north and west, respectively, from its position in the "Four Corners" region during the period of the climatological maximum of monsoon precipitation from mid-July to mid-August. An hourly radar gauge precipitation product shows evidence of organized, westward-propagating convection in Arizona during the type-I and type-II severe weather events. This new methodological approach for objectively identifying severe weather events may be easily adapted to inform operational forecasting or analysis of gridded climate data.

Characterization of rock masses and evaluation of their mechanical properties are important and challenging tasks in rock mechanics and rock engineering. Since in many cases rock quality designation (RQD) is the only rock mass classification index available, this paper outlines the key aspects on determination of RQD and evaluates the empirical methods based on RQD for determining the deformation modulus and unconfined compressive strength of rock masses. First, various methods for determining RQD are presented and the effects of different factors on determination of RQD are highlighted. Then, the empirical methods based on RQD for determining the deformation modulus and unconfined compressive strength of rock masses are briefly reviewed. Finally, the empirical methods based on RQD are used to determine the deformation modulus and unconfined compressive strength of rock masses at five different sites including 13 cases, and the results are compared with those obtained by other empirical methods based on rock mass classification indices such as rock mass rating (RMR), Q-system (Q) and geological strength index (GSI). It is shown that the empirical methods based on RQD tend to give deformation modulus values close to the lower bound (conservative) and unconfined compressive strength values in the middle of the corresponding values from different empirical methods based on RMR, Q and GSI. The empirical methods based on RQD provide a convenient way for estimating the mechanical properties of rock masses but, whenever possible, they should be used together with other empirical methods based on RMR, Q and GSI. (C) 2016 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting by Elsevier B.V.

No description available.

The Church of England is living through a time of significant change in attitudes towards local church ministry, congregational participation and pastoral practices. As it seeks to respond with integrity to changes in contemporary society the Church’s dialogue with empirical social research is beginning to develop more fully. This thesis focuses on a pioneer national project to explore the effectiveness of pastoral ministry in contemporary church weddings. The social science research methods used in this project revealed insights into the ministry of contemporary church weddings with the intention of shaping responsive parochial wedding policies. This thesis considers the potential for further local enquiry by individual marrying clergy to understand the ordinary theology (proposed by Astley) of their communities using methods of ordinary research alongside a shared reflective practice. It highlights the socio-theological interface within reflective empirical theology by pastoral practitioners in the Church. A model of participatory action research incorporating online clergy forums and change agent groups is explored to stimulate parochial and institutional change among clergy in partnership with each other. The role of priest researchers is proposed and identified in other pastoral contexts to examine factors that motivate clergy to participate in the development of pastorally responsive national policies. A methodology of personal diaries, focus groups and one to one interviews is used to explore the responses of clergy to participating in reflective praxis. The findings point to key factors in developing pastoral practice and policies involving the place of ministerial development and attitudes towards collaborative working. A typology of pastoral ministry is developed towards identifying priest researchers in the Church. The research affirms the contribution of pastoral practitioners towards the development of pastorally responsive national policies but the nature of parochial deployment and clergy relationships with each other and the Church institutions frequently preclude much of this contribution.