Computing and Information Systems - Theses
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ItemInterest-based negotiation in multi-agent systems( 2004)Software systems involving autonomous interacting software entities (or agents) present new challenges in computer science and software engineering. A particularly challenging problem is the engineering of various forms of interaction among agents. Interaction may be aimed at enabling agents to coordinate their activities, cooperate to reach common objectives, or exchange resources to better achieve their individual objectives. This thesis is concerned with negotiation: a process through which multiple self-interested agents can reach agreement over the exchange of scarce resources. In particular, I focus on settings where agents have limited or uncertain information, precluding them from making optimal individual decisions. I demonstrate that this form of bounded-rationality may lead agents to sub-optimal negotiation agreements. I argue that rational dialogue based on the exchange of arguments can enable agents to overcome this problem. Since agents make decisions based on particular underlying reasons, namely their interests, beliefs and planning knowledge, then rational dialogue over these reasons can enable agents to refine their individual decisions and consequently reach better agreements. I refer to this form of interaction as “interested-based negotiation.” (For complete abstract open document)
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ItemAn investigation of interactivity and flow: student behaviour during online instruction( 2004-12)This thesis combines ideas from human-computer interaction, education and psychology to explore the interactions of students in an online learning environment. The motivation for the work was to understand better how to engage students in a highly enjoyable experience of online learning. The thesis describes three experiments. The first experiment was an exploratory study investigating the influence of learner interactions in an online physics learning task. Students worked through an online learning experience that offered high and low levels of interactivity. The aim was to explore their interactions and choices in an environment in which they could elect to move from the highly interactive mode to the less interactive mode at any time. Web logs were used to track their interactions and question probes gathered data on their emotions, learning goals and strategies. The analysis revealed a number of different patterns of interaction. Statistical analysis showed that most, but not all, preferred to follow an interactive path through the material. Students who used the interactive materials showed improved learning gains in transfer-style questions compared to those in the less interactive mode. Several issues were identified as important to consider in a follow-up study: emotions, affect, challenge, and the degree of control that the learner perceives.
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ItemBrowsing and searching compressed documents( 2003-12)Compression and information retrieval are two areas of document management that exist separately due to the conflicting methods of achieving their goals. This research examines a mechanism which provides lossless compression and phrase-based browsing and searching of large document collections. The framework for the investigation is an existing off-line dictionary-based compression algorithm. (For complete abstract open document)
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ItemEfficient mining of interesting emerging patterns and their effective use in classification( 2004-07)Knowledge Discovery in Databases (KDD), or Data Mining is used to discover interesting or useful patterns and relationships in data, with an emphasis on large volume of observational databases. Among many other types of information (knowledge) that can be discovered in data, patterns that are expressed in terms of features are popular because they can be understood and used directly by people. The recently proposed Emerging Pattern (EP) is one type of such knowledge patterns. Emerging Patterns are sets of items (conjunctions of attribute values) whose frequency change significantly from one dataset to another. They are useful as a means of discovering distinctions inherently present amongst a collection of datasets and have been shown to be a powerful method for constructing accurate classifiers. (For complete abstract open document)
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ItemInnovation in university computer-facilitated learning systems: product, workplace experience and the organisation( 2003-06)This thesis reports on the development of a generic online system to support learning and teaching at the University of Melbourne. New online technologies, the fostering of innovation at national and university levels and my position within a central educational unit provided the opportunity in 1996 to adapt a previous software package for online use. My observations of the problematic nature of computer-facilitated learning (CFL) production led me to take an open approach to the development, seeking both a practical product and enhanced understanding. A series of formative questions defined the scope and goals of the study, which were to: *produce a generic online learning system; *increase understanding of the workplace experience of that development; and *develop an organisational model for the further development of generic CFL systems. Given this multi-disciplinary focus, many paradigms in the literature could potentially have guided the study. A number of these aligning with the research purposes, context and constructivist philosophy of the study, were reviewed from the perspectives of learning, CFL development and the organisation.
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ItemCustom as a source of supranational internet commerce law( 2003)The Internet has changed the world. Its impact on the global society has been enormous, redefining almost every aspect of our life. It has also added a new quality to traditional commerce that in many instances has drastically transformed the way companies and individuals trade. However, electronic commerce is not a legally safe environment, as there exists a regulatory gap that introduces uncertainty surrounding rights and obligations in cyberspace. This may result in unexpected outcomes for e-commerce participants involved in litigation.
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ItemAccounting conservatism: evidence from the oil and gas industry( 2004)Prior evidence in the oil and gas industry suggests that investors, when assessing firm value, seem to distinguish between different degrees of accounting conservatism that result from the application of the successful efforts (SE) method versus the full cost (FC) method. However, research addressing the valuation implications of accounting choice in the oil and gas industry primarily investigated periods prior to the issuance of SFAS 121. The effect of SFAS 121 on accounting conservatism in the oil and gas industry and hence on the usefulness of the SE method, relative to the FC method, remains untested. This study extends the existing literature by re-examining the effect of accounting conservatism on the usefulness of accounting numbers produced by SE and FC methods during the period 1995-2001, a period in which both SFAS 121 and the ceiling test rules were applied. Empirical results show that in an environment of both SFAS 121 and the ceiling test, there is no difference between SE and FC firms with respect to conservatism associated with the application of accounting rules. Moreover, the results show that the usefulness of accounting numbers to investors does not differ across SE and FC methods. That is, investors attach no valuation premium of one method over the other in the oil and gas industry. This examination provides updated evidence that should be of interest to regulators and standards setters.
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ItemTowards reframing outsourcing: a study of choices regarding processes, structures, and success: exploration into an organization's choices regarding the outsourcing process lifecycle, the configuration structures, and the nature of success( 2005)Pervasive adoption has made outsourcing a growing multi-billion dollar industry. The market is ever maturing, suppliers and their offerings ever expanding, and technology advancements are increasingly enabling the separation of management, delivery, and operations. Furthermore, with "offshore outsourcing" attracting increasing attention, the level of outsourcing activity seems set to grow even larger, lending a new dimension to the role of a CIO — that of service broker between internal and external service providers (Baty, 2001). This is in spite of all too frequent failures emerging in recent studies. Consistent with the self-interest arguments of agency theory and transaction cost economics, outsourcing unleashes powerful forces of organizational self-interest that can spell doom for the inexperienced outsourcing manager. Research into outsourcing has attempted to help managers achieve greater success with outsourcing; however, along with mixed success has come mixed advice. Numerous studies propose a wide range of recipes for success, but problems continue, seemingly unabated. In particular, despite over a decade of research into IT outsourcing (ITO), no comprehensive models of ITO processes, structures, or success have emerged. This research attempts to achieve a degree of unification, of what is presently a fragmented literature, by developing and testing three frameworks designed assist research and management with decision-making. Those three frameworks are as follows: (1) a process framework for ITO consisting of a four-phase "Outsourcing Lifecycle" with 54 key activities, (2) a taxonomic framework, "Configuration", for classifying different ITO structures, comprised of seven structural attributes with 27 high-level options at both the deal (individual outsourcing arrangement) and portfolio (organizational) level, and (3) a conceptual framework for measuring ITO success, with 25 goals/outcomes grouped into three categories of financial, operational, and strategic. These three frameworks were developed through careful analysis of 100 outsourcing cases from 1994 to 2003, three ITO surveys conducted in Australia during 1994 to 2001, and the literature. To explore their validity and usefulness, the frameworks were tested during 2003 and 2004 via in-depth interviews in seven large Australian organizations. The findings add further weight to the conclusions from the original 100 cases, surveys, and the prior literature: the three frameworks are important for understanding, comparing, and managing ITO arrangements. Building on these three frameworks, the primary contribution of this thesis is its demonstration that outsourcing is more about complex choices than has ever been recognized in the prior literature. Organizations contemplating outsourcing face an inestimable number of choices. The fundamental proposition of this thesis is that when guided on what choices must be made, the rationale behind the choices, and the potential issues each choice creates, management can make better decisions to achieve their desired objectives. The implication for management of this insight is that if made and managed appropriately, sound choices will enable firms to manage the extremely strong forces of organizational self-interest and help deliver benefits that outsourcing can be capable of delivering. The implication for researchers is that prior studies may have yielded inconsistent and incomplete results because researchers failed to recognize the different choices that firms face, and their importance, in fully understanding ITO.
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ItemTechniques for academic timetabling( 2005)This thesis examines two different academic timetabling problems: the Examination Timetabling problem and the Population and Class Timetabling Problem. Initially an extensive survey of academic timetabling literature is undertaken, examining those methods and algorithms that have proved useful for solving academic timetabling problems. A hybrid algorithm, combining constraint programming, simulated annealing and hill climbing, is presented as a method for solving the examination timetabling problem. This algorithm is able to solve the examination timetabling problem at the University of Melbourne, and provides good results on international benchmark data. The population and class timetabling problem is decomposed using the blocking decomposition into a series of integer programs that are all solved to optimality. A model is presented for a simplified version of the class blocking and population problem which solves this problem to optimality without further decomposition. The model is expanded to solve this problem faced by Xavier College, an Australian secondary school. Two separate overlapping blocking schemes are used to allow the problem for different year levels to be solved simultaneously. Two more integer programs allocate to sessions the lessons of the blocks and a subset of the classes from the school. When combined these three stages produce a feasible timetable for Xavier College in a fraction of the time it takes using the current methodology.
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ItemThe institutional and technical antecedents of organisational design: a case study in the Victorian metropolitan hospital system( 2002)This dissertation examines organisational structures and management control systems in the health care sector. The influence of two antecedent variables, the institutional environment and the technical environment, on organisational design choice is examined through the use of institutional theory and transaction cost economics. These theories are used to interpret the structural and management control system responses of hospitals under pressure to form inter-organisational networks. The implications of these design responses for organisational outcomes are examined in order to assess the relative importance of efficiency and/or effectiveness versus legitimacy as the principle logic of organisational action. A case-based investigation into three large public hospital networks in Victoria Australia is undertaken. Semi-structured interviews are the primary source of empirical evidence used to address the research questions of interest. Systematic data collection and analysis protocols are employed to ensure the reliability and validity of the qualitative research method employed. The results of this study indicate that both the technical and institutional environments in which an organisation operates jointly influence organisational design. Hospital networks are found to exhibit a range of structures, which are described according to the extent of horizontal integration observed. Both the type and use of control systems employed in these networks differs according to the extent of integration. Significant integration of core services across constituent hospitals of a network is found to be associated with an increase in the prevalence of integrative liaison devices. Such networks also realign other management control systems, such as the performance measurement system and standard operating procedures, to reflect the network-wide nature of activities. It is found that where a 'fit' is achieved between the antecedent environment variables and organisational design, organisational outcomes are enhanced.