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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
151

Modelling and systematic assessment of maritime container supply chain risks

Wan, C. January 2019 (has links)
Maritime container supply chains (MCSCs) is exposed to various risks arising from both internal operations and the external environment, and the increasing complexity of the modern global logistics system makes the situation even worse, thus causing a significant challenge to the effective risk management of MCSCs. However, systematic studies on this topic are relatively few. In view of this, this study aims to explore and analyse various MCSC risks, develop suitable risk assessment methods, and evaluate the overall performance of MCSCs from a systematic perspective, so as to ensure the safety, reliability, and resilience of MCSCs. This research starts with the identification and classification of all possible risk factors that may be involved in an MCSC based on a comprehensive literature review, and the research results are further validated through a Delphi expert survey. The identified risk factors are then analysed, screened, and assessed in detail. The novelty of this study lies not only on the risk assessment of MCSCs under an uncertain environment from a supply chain level but also on the consideration of the impact of risk condition of each individual MCSC on the overall performance of the entire container supply network. The research results will provide useful insights and valuable information for both researchers and practitioners on the risk analysis and assessment of MCSCs, which is beneficial to different types of stakeholders involved in the maritime shipping industry. The work is also able to provide a theoretical foundation for risk-based decision making and shipping route optimisation in further work. Although the risk assessment methods are presented on the basis of the specific context in MCSCs, it is believed that, with domain-specific knowledge and data, they can also be tailored for a wide range of applications to evaluate the reliability and performance of other supply chain systems, especially where a high level of uncertainty is involved.
152

Smart policy for public value : strategic management in public sector reform

Blanes, Ramona January 2017 (has links)
This thesis explored the public value (PV) concept as strategic management to (re)introduce the concept of social responsibility and ethics within the public sector. Public sector governance relied on the assumption that the specific attributes of the various public sector governance approaches influenced public managers’ actions and decisions. The attributes of the management approach became more aligned with the PV concept as it moved along a public sector reform (PSR) continuum. To compare and contrast the PV concept in the various cultures and institutional settings through the lens of Intelligent Transportation Systems (ITS)-related policies and programmes, three countries at the different stages of PSR were chosen. The results showed there were varying degrees of PSR acceptance and compliance at the various government levels. Thus, more than one dominant PSR model existed simultaneously in a country. The extent to which the changes were accepted and complied with depended on several dynamics. Additionally, the results discovered that the PV concept influenced public managers’ practices despite the governance traditions. This discovery validated the fact that a country did not have to be at the most sophisticated PSR stage to strategise using the PV concept. Finally, the results supported the view that ITS enabled easy and continuous data collection for the public managers. This ease of data collection advanced the process of knowledge exchange to co-create/co-produce or share PV with the public. The knowledge collaboration and sharing could lead to innovation, sustainability and the perception of value by the public.
153

The role of tourism in sustainable rural development : A multiple case study in rural Taiwan

Chang, Jung-Chen January 2011 (has links)
This thesis adopts an integrated tourism research approach to investigate the role of tourism in sustainable rural development. It identifies what the key ingredients of sustainable rural tourism development (SRTD) could be, which include an effective policy framework, good partnerships between stakeholders and a strong connection between tourism and local resources. A qualitative approach is adopted in investigating the cases of the Puli, Yuchih, and Renai townships in Taiwan, and the investigation focuses on three key concepts of policy, partnership and place (3Ps). Several issues emerged from the investigation. Due to dependence on central government support, the public-private partnership appears problematic; however, the strong level of business support networks and community organisations engaging in tourism strengthens local initiative in promoting sustainable development. The effects of tourism on local development are perceived as having more positive outcomes than negative ones, even though, the contribution of tourism to SRTD is still considered limited due to the scale of the rural decline problem it is trying to address. The influential correlations between policy, partnership, and place that emerged from the empirical findings evidently support the 3 Ps integrated tourism concept proposed by this research. This provides a more realistic and holistic understanding of tourism in rural areas. The thesis contributes to the literature by introducing the 3 Ps integrated tourism concept, and empirically, through the case studies, it also contributes to the understanding of current rural tourism development in an East Asian context.
154

Search engine bias : the structuration of traffic on the World-Wide Web

Van Couvering, Elizabeth January 2010 (has links)
Search engines are essential components of the World Wide Web; both commercially and in terms of everyday usage, their importance is hard to overstate. This thesis examines the question of why there is bias in search engine results – bias that invites users to click on links to large websites, commercial websites, websites based in certain countries, and websites written in certain languages. In this thesis, the historical development of the search engine industry is traced. Search engines first emerged as prototypical technological startups emanating from Silicon Valley, followed by the acquisition of search engine companies by major US media corporations and their development into portals. The subsequent development of pay-per-click advertising is central to the current industry structure, an oligarchy of virtually integrated companies managing networks of syndicated advertising and traffic distribution. The study also shows a global landscape in which search production is concentrated in and caters for large global advertising markets, leaving the rest of the world with patchy and uneven search results coverage. The analysis of interviews with senior search engine engineers indicates that issues of quality are addressed in terms of customer service and relevance in their discourse, while the analysis of documents, interviews with search marketers, and participant observation within a search engine marketing firm showed that producers and marketers had complex relationships that combine aspects of collaboration, competition, and indifference. The results of the study offer a basis for the synthesis of insights of the political economy of media and communication and the social studies of technology tradition, emphasising the importance of culture in constructing and maintaining both local structures and wider systems. In the case of search engines, the evidence indicates that the culture of the technological entrepreneur is very effective in creating a new megabusiness, but less successful in encouraging a debate on issues of the public good or public responsibility as they relate to the search engine industry.
155

Governmentality and the information society : ICT policy practices in Greece under the influence of the European Union

Chini, Ioanna January 2010 (has links)
The perceived socio-economic significance of Information and Communication Technology (ICT) has dramatically expanded the domains in which this cluster of technologies is being discussed and acted upon. Action to promote the 'information society' has made its way into governmental policy. National technology policy and action cannot however be adequately understood solely as the calculation of needs according to the development aspirations of the country concerned. Instead it needs to be placed in the intersection of simultaneous efforts by national and international organisations to shape technological developments. This research examines the nature of efforts made to promote ICT innovation through national policies and programmes in the midst of international and regional influences. The thesis involves the historical analysis of the policies for ICT diffusion in Greece within the context of the European efforts to promote the information society. It examines how the Greek state undertook to implement a large-scale ICT programme, in the backdrop of hesitant attempts at modernisation and technological innovation. The research traces the emergence of the ICT programme and the European visions which framed it, and explores the discourses and practices through which it came to materialise. The research is theoretically infomred by Foucault's ideas on governmentality, focusing on the government and self-government of conduct. The study explores the discourses sustained through the European and Greek policies on the information society. Practices of funding, monitoring and reporting are also scrutinised to understand the forms of discipline and contestation they gave rise to. Through this theoretical analysis, the research engages in a context-sensitive examination of the taken-for-granted relationship between policies and their implementation. The main contribution of the thesis lies in illuminating the often neglected role of international and regional organisations in shaping technological agendas, and the material practices which allow them to operate effectively across distances.
156

Satellite communications : the political determination of technological development, 1961-1975

Wasserman, Edward Jay January 1979 (has links)
The thesis sets forth a model relating political contention to technological development. The selective realisation of a technical potentiality is shown to have been determined by conflict and negotiation among shifting alliances of state and private-industrial entities, each attempting to impose its requirements upon an emergent technology and thereby to dictate the precise form and pace of technical development. The 'course of communications satellite development is examined during the technology's formative period from 1961 to 1975--as the product of struggles over technological control. Negotiation centered upon control, and contending modes of technical development were promoted and opposed on the basis of their perceived consequences upon the distribution of effective control over the technology. The initial mode of satellite development lasted from 1961 to 1971 and is characterised as pre-emptive underdevelopment; urgency and haste were combined with tight constraints on the qualitative breadth allowed to technological articulation. Pre-emptive underdevelopment derived from an uneasy political accommodation struck among constituencies dominant during this phases the U.S. government, American communications carrier industry and a Western European intergovernmental bloc. The reigning compromise was directed toward expediting satellite development sufficiently to forestall rival deployments without endangering existing and anticipated interests in both satellite and competitive technologies. Technical development beneath a minimum level risked undermining the regime of control by leaving open the possibility of rival satellite systems; but development beyond a maximum level would have harmed the outstanding industrial and political interests in whose defence control was sought, while subverting the control regime by widening the legitimate scope for multinational participation in authority over the technology. Pre-emptive underdevelopment, it is argued, was succeeded largely by the products of its own success in meeting the policy requirements of initially dominant entities and in thus reducing the continued importance of satellite technology as a political arena and instrumentality. Restraints upon development could therefore, in the post-1971 period, be relaxed, while the growing demand for a wider array of satellite services encouraged emergence of a more intensive mode of technological development under the auspices of a de-cartelised, quasi-federal and multinational political regime.
157

From strategy, to accounting : accounting practice and strategic discourse in the telecommunications industry

Lim, Gavin S. Z. January 2000 (has links)
Following Roberts (1990) and Dent (1990). this study investigates the importance of complexifying the relationship between strategy and accounting. The genealogical approach of Hoskin et al (1997) provides inspiration as to the ways in which strategic discourse (itself promoted as a subject of study by Knights and Morgan (1990,1991,1995)) is historically contingent upon practices of accounting. I take up this task of inaugurating the study of accounting practice and strategy discourse, from strategy to accounting, to develop a new perspective of how their interaction takes place. This gives birth to a re-reading of the strategy (and accounting) literatures, from the direction of a constitutive notion of accounting practices. In particular, the processual and critical schools of strategy are found to promote conventional notions of accounting as mirror, as secondary and passive practice, which circulate beneath the usual level of visibility. Building on this emergent approach, a post- Foucauldian theory of practices is outlined from a methodological viewpoint. This approach does not begin from such general categories as 'the individual', 'the social' or 'the economic', and thereby does not follow conventional understandings of 'doing ethnography'. The inquiry is empirically situated within the context of a longitudinal investigation (1997-2000) into the U. K. based part of a global telecommunications company, Teleco. I discover complex interactions between accounting practices and the workings of strategy, both as presence and absence. There is a partial presence of strategy even within the most 'strategic' parts of Teleco, in conjunction with a growing absence within those parts most distant from 'the strategy'. Despite this, or perhaps because of this, the spread of accounting and accounting based-practices rolls on, albeit in a non-uniform way. This brings forth the possibility of a strategic accounting, one whose practices are perhaps most visibly internalised and effected on my very self, thus adding weight to the rejection within this thesis of the metaphysical categories of either 'strategy' or 'accounting.
158

Traffic management and control of automated guided vehicles using artificial neural networks

Barbosa, Manuel Romano dos Santos Pinto January 1997 (has links)
An industrial traffic management and control system based on Automated Guided Vehicles faces several combined problems. Decisions must be made concerning which vehicles will respond, or are allocated to each of the transport orders. Once a vehicle is allocated a transport order, a route has to be selected that allows it to reach its target location. In order for the vehicle to move efficiently along the selected route it must be provided with the means to recognise and adapt to the changing characteristics of the path it must follow. When several vehicles are involved these decisions are interrelated and must take into account the coordination of the movements of the vehicles in order to avoid collisions and maximise the performance of the transport system. This research concentrates on the problem of routing the vehicles that have already been assigned destinations associated with transport orders. In nearly all existing AGV systems this problem is simplified by considering there to be a fixed route between source and destination workstations. However if the system is to be used more efficiently, and particularly if it must support the requirements of modern manufacturing strategies, such as Justin- Time and Flexible Manufacturing Systems, of moving very small batches more frequently, then there is a need for a system capable of dealing with the increased complexity of the routing problem. The consideration of alternative paths between any two workstations together with the possibility of other vehicles blocking routes while waiting at a particular location, increases enormously the number of alternatives that must be considered in order to identify the routes for each vehicle leading to an optimum solution. Current methods used to solve this type of problem do not provide satisfactory solutions for all cases, which leaves scope for improvement. The approach proposed in this work takes advantage of the use of Backpropagation Artificial Neural Networks to develop a solution for the routing problem. A novel aspect of the approach implemented is the use of a solution derived for routing a single vehicle in a physical layout when some pieces of track are set as unavailable, as the basis for the solution when several vehicles are involved. Another original aspect is the method developed to deal with the problem of selecting a route between two locations based on an analysis of the conditions of the traffic system, when each movement decision has to be made. This lead to the implementation of a step-by-step search of the available routes for each vehicle. Two distinct phases can be identified in the approach proposed. First the design of a solution based on an ANN to solve the single vehicle case, and subsequently the development and testing of a solution for a multi-vehicle case. To test and implement these phases a specific layout was selected, and an algorithm was implemented to generate the data required for the design of the ANN solution. During the development of alternative solutions it was found that the addition of simple rules provided a useful means to overcome some of the limitations of the ANN solution, and a "hybrid" solution was originated. Numerous computer simulations were performed to test the solutions developed against alternatives based on the best published heuristic rules. The results showed that while it was not possible to generate a globally optimal solution, near optimal solutions could be obtained and the best hybrid solution was marginally better than the best of the currently available heuristic rules.
159

The use of the internet in the lives of women with breast cancer : narrating and storytelling online and offline

Orgad, Shani January 2003 (has links)
This thesis explores the experience of breast cancer patients' online participation in relation to their illness. The research focuses on the work of narrating as the key process in patients' online communication. Empirically, it stems from the noticeable recent proliferation of breast cancer forums, particularly in online spaces. I argue that the production of a story and its telling online enables the patient to cope with a radically new situation in her life. The claim for the significance of breast cancer patients' online communication, particularly narrating, is located within the historical and cultural context of the illness. In examining the process of narrating and storytelling, I draw on sociological and psychoanalytical theories of narrative and storytelling, and sociological debates on issues of health and illness, everyday life and the nature of agency, social exchange, and the tension between the public and the private. The study is based on a phenomenological study that included twenty nine online (e-mail) and twelve face-toface interviews with breast cancer patients, and a textual analysis of related websites. It shows how the work of narrating is facilitated through the online space, highlighting it as a process that has significant consequences for their ability to cope with their illness. The thesis concludes with a self-reflexive account of the employment of narrating as a conceptual, analytical and methodological tool for the study of breast cancer patients' processes of online communication. It argues for the need to acknowledge the constraints that shape the online space, calling into doubt its supposed openness, borderlessness, fluidity and lack of structure. In particular, the discussion highlights the persistence of the cultural dimension of the online communication, questioning the extent to which the nature of online communication is global, as is often argued. The concluding chapter uses the empirical case to engage with the broader concern with the relationship between media, communication and agency. Key words: narrative; narrating; storytelling; Internet; online; offline; breast cancer; agency; interviews.
160

Haptic communication for remote mobile and manipulator robot operations in hazardous environments

Counsell, M. January 2003 (has links)
Nuclear decommissioning involves the use of remotely deployed mobile vehicles and manipulators controlled via teleoperation systems. Manipulators are used for tooling and sorting tasks, and mobile vehicles are used to locate a manipulator near to the area that it is to be operated upon and also to carry a camera into a remote area for monitoring and assessment purposes. Teleoperations in hazardous environments are often hampered by a lack of visual information. Direct line of sight is often only available through small, thick windows, which often become discoloured and less transparent over time. Ideal camera locations are generally not possible, which can lead to areas of the cell not being visible, or at least difficult to see. Damage to the mobile, manipulator, tool or environment can be very expensive and dangerous. Despite the advances in the recent years of autonomous systems, the nuclear industry prefers generally to ensure that there is a human in the loop. This is due to the safety critical nature of the industry. Haptic interfaces provide a means of allowing an operator to control aspects of a task that would be difficult or impossible to control with impoverished visual feedback alone. Manipulator endeffector force control and mobile vehicle collision avoidance are examples of such tasks. Haptic communication has been integrated with both a Schilling Titan II manipulator teleoperation system and Cybermotion K2A mobile vehicle teleoperation system. The manipulator research was carried out using a real manipulator whereas the mobile research was carried out in simulation. Novel haptic communication generation algorithms have been developed. Experiments have been conducted using both the mobile and the manipulator to assess the performance gains offered by haptic communication. The results of the mobile vehicle experiments show that haptic feedback offered performance improvements in systems where the operator is solely responsible for control of the vehicle. However in systems where the operator is assisted by semi autonomous behaviour that can perform obstacle avoidance, the advantages of haptic feedback were more subtle. The results from the manipulator experiments served to support the results from the mobile vehicle experiments since they also show that haptic feedback does not always improve operator performance. Instead, performance gains rely heavily on the nature of the task, other system feedback channels and operator assistance features. The tasks performed with the manipulator were peg insertion, grinding and drilling.

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