To see the other types of publications on this topic, follow the link: Digital access.
Dissertations / Theses on the topic 'Digital access'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'Digital access.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Helberger, Natali. "Controlling access to content regulating conditional access in digital broadcasting /." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2005. http://dare.uva.nl/document/78324.
Full text
2
Goh, Cheh-Ngee. "Random multiple access in digital communication networks." Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47079.
Full text
3
Guérin, Delphine. "MDPI Multidisciplinary Digital Publishing Institute." Universitätsbibliothek Chemnitz, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-213161.
Full textAbstract:
Im Rahmen der Internationalen Open Access Week 2016 fand am 26.10.2016 die Veranstaltung "Open in Action at TU Chemnitz" statt. Der Vortrag des MDPI - Multidisciplinary Digital Publishing Institute - berichtet über die Aktivitäten des Open-Access-Verlages und die Vorteile für Autoren. Die Präsentation zeigt das Leistungsspektrum und gibt Auskunft über den Peer Review-Prozess. Seit 2015 hat die Universitätsbibliothek eine Institutionelle Vereinbarung mit dem MDPI geschlossen. Der Publikationsworkflow ist für Wissenschaffende einfach und transparentIn the context of the International Open Access Week 2016, the event "Open in Action at TU Chemnitz" was held on 26 October 2016. The lecture of the MDPI – the Multidisciplinary Digital Publishing Institute – presents the past and current activities of the open access publisher and the author benefits. The presentation shows the procedures and the range of inhouse services in the editorial and the peer review process. The University Library of the Technische Universität Chemnitz has held an institutional membership with the MDPI AG since 2015. Thus, the publication and invoicing workflow is made simple and transparent for academics
4
O'Keeffe, Richard John. "Baby boomers and digital literacy| Their access to, and uses of, digital devices and digital media." Thesis, Pepperdine University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3644309.
Full textAbstract:
Digital literacy is fast becoming a necessary skill for mediating life in the 21st century. Digital technologies, digital media, and digital devices have become ubiquitous and intrinsic in modern society and using one to interact with the others requires specific skills—digital literacies—be learned. The purpose of this research was to understand the extent to which Baby Boomers are digitally literate, the digital devices they understand and use, and the purposes for which they are using them.
Residents living in a specific group of age-restricted communities comprised of people 55 years of age and older were e-mailed requests to participate in an online survey. More than 8,200 homes received the invitations and 659 people agreed to participate. The survey consisted of 17 three-part, forced-choice questions and five demographic identifiers. To analyze the data, the researcher used SPSS and ran chi-square tests on each response comparing Older Boomers to Younger Boomers regarding specific digital activities in which they engaged, the device(s) they used, and the frequencies with which they engaged in those activities.
The results of this study indicate that the Baby Boomers in the study possess basic functional digital literacies. They use the Internet daily to read news, check weather, and look up recipes, directions, and medical information. While participation in the various activities was fairly even between both Boomer groups, Younger Boomers tend to send and receive text messages, bank online, pay bills online, search for recipes, save online bookmarks, visit social networks, read blogs, and take online classes more than Older Boomers. The majority of respondents were women, college educated, with annual household incomes of $75,000.00 or more. The most popular digital devices used were laptops, desktops, tablets, and smartphones, respectively and respondents averaged using three different digital devices while engaging in their digital activities. The trend is toward decreasing use of desktop and laptop computers and a corresponding increase in the use of tablets and smartphones.
5
Bürger, Thomas. "Open Access für die Digitale Bibliothek." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-63372.
Full textAbstract:
Im Internet hat die Wissensgesellschaft des 21. Jahrhunderts ihr Medium der Zukunft gefunden. Aus der historischen Perspektive der Aufklärung ist die Menschheit dem Ziel näher denn je, möglichst vielen Menschen ungehinderten Zugang zu Information und Wissen zu verschaffen.
6
Zuta, Chávez María Enedina, and Serván Luis Homero Chuqui. "Repositorio digital Amazonense." Universidad Peruana de Ciencias Aplicadas (UPC), 2012. http://hdl.handle.net/10757/622616.
Full textAbstract:
Conferencia realizado del 12 al 14 de setiembre en Lima, Peru del 2012 en el marco del 15º Simposio Internacional de Tesis y Disertaciones Electrónicas (ETD 2012). Evento aupiciado por la Universidad Nacional Mayor de San Marcos (UNMSM) y la Universidad Peruana de Ciencias Aplicadas (UPC).La Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, con sede en la ciudad San Juan de la Frontera de los Chachapoyas, capital de la Región Amazonas, como Institución Educativa Superior, comprometida en su rol protagónico que asume ser líder con el Desarrollo del País a través de la Proyección Social y Extensión Cultural, utilizando los conocimientos y recursos que van acorde con las nuevas tecnologías de información y comunicación, por medio de la Oficina General de Información y Referencias Bibliográficas - OGIRB, se complace en presentar el primer Repositorio Digital , regional del Perú, denominado: “REPOSITORIO DIGITAL AMAZONENSE”, cuyo objetivo principal es acopiar e inventariar mediante el uso de recursos digitales, textos de autores, investigadores y aficionados de las diferentes áreas temáticas de la Región Amazonas, y plasmados en un gigante Repositorio de acceso abierto e universal, promueva y difunda la cultura regional a nivel nacional e internacional, creando nuevas puertas en el acceso universal a la investigación y resaltando en el País la presencia de esta Casa Superior de Estudios, motivando la integración de las demás regiones y juntos formar un SOLO REPOSITORIO DIGITAL PERUANO.
7
Klas, Claus-Peter Goevert Norbert Fuhr Norbert. "Distributed agents for user-friendly access of Digital Libraries." Gerhard-Mercator-Universitaet Duisburg, 2004. http://www.ub.uni-duisburg.de/ETD-db/theses/available/duett-04232004-151931/.
Full textAbstract:
Despite the fact that many Digital Libraries (DLs) are available on the Internet, users cannot effectively use them because of inadequate functionality, deficient visualisation and insufficient integration of different DLs. In the framework of this project we develop a user-oriented access system for DLs which overcomes these drawbacks. Based on experiences from the librarian area, higher functions to assist proved search strategies will be implemented. Different DLs will be tightly integrated, so that system-wide search and navigation is possible. The system will be adaptive towards different user wishes, regarding preferences concerning content and system involvement.
8
Kapur, Akash. "Bridging the digital divide : regulating universal access in India." Thesis, University of Oxford, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.410861.
Full text
9
Mudlapur, Anandshankar S. Agrawal Vishwani D. "Practically realizing random access scan." Auburn, Ala., 2006. http://repo.lib.auburn.edu/2006%20Spring/master's/MUDLAPUR_ANAND_14.pdf.
Full text
10
Shirazi, Hamidreza. "Cooperating broadcast and cellular conditional access system for digital television." Thesis, Brunel University, 2009. http://bura.brunel.ac.uk/handle/2438/3758.
Full textAbstract:
The lack of interoperability between Pay‐TV service providers and a horizontally integrated business transaction model have compromised the competition in the Pay‐TV market. In addition, the lack of interactivity with customers has resulted in high churn rate and improper security measures have contributed into considerable business loss. These issues are the main cause of high operational costs and subscription fees in the Pay‐TV systems. This paper presents a novel end‐to‐end system architecture for Pay‐TV systems cooperating mobile and broadcasting technologies. It provides a cost‐effective, scalable, dynamic and secure access control mechanism supporting converged services and new business opportunities in Pay‐TV systems. It enhances interactivity, security and potentially reduces customer attrition and operational cost. In this platform, service providers can effectively interact with their customers, personalise their services and adopt appropriate security measures. It breaks up the rigid relationship between a viewer and set‐top box as imposed by traditional conditional access systems, thus, a viewer can fully enjoy his entitlements via an arbitrary set‐top box. Having thoroughly considered state‐of‐the‐art technologies currently being used across the world, the thesis highlights novel use cases and presents the full design and implementation aspects of the system. The design section is enriched by providing possible security structures supported thereby. A business collaboration structure is proposed, followed by a reference model for implementing the system. Finally, the security architectures are analysed to propose the best architecture on the basis of security, complexity and set‐top box production cost criteria.
11
O'Beirne, Ronan. "Academic libraries, open access and digital scholarship : a Delphi study." Thesis, University of Sheffield, 2017. http://etheses.whiterose.ac.uk/20326/.
Full textAbstract:
The thesis is an examination of the changing relationship between the academic library and university research. Advances in information technology, shifts in the modes of knowledge production and changes in research practice have affected all points of the research lifecycle. The implications for library practice are far-reaching. Informed by a review of the literature on the drivers of open access, digital scholarship and the knowledge economy, a web-based Delphi study was designed, conducted and analysed to identify the factors likely to have most impact on library practice. Thirty-five expert participants, all employed in roles such as library directors within universities, were asked to consider current and future scenarios for the development of the academic library, its identity and its shape and direction. In particular, the Delphi study investigated the overlapping areas of open access policy, research data management, organisational capacity, scholarly communication and peer review, and library leadership and workforce development. The findings of the research highlighted, firstly, the complexity of the policies and strategies associated with open access, secondly, their likely profound impact on the concept and character of the academic library, and, thirdly, the extent to which university and library leaders have yet to fully appreciate the potency and urgency of digital scholarship. The argument of the thesis is that academic libraries need to embrace transformative change and cultural shift across the entire research lifecycle, rather than simply responding with local, iterative change. In drawing on the expert understandings and reflections of key players, a conceptual framework is developed, to raise awareness of emerging issues and serve as a guide to future action.
12
Whitacre, Brian E. "Bridging the Rural - Urban Digital Divide in Residential Internet Access." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/29102.
Full textAbstract:
This dissertation explores the persistent gap between rural and urban areas in the percentage of households that access the Internet at home (a discrepancy commonly known as the "digital divide"). The theoretical framework underlying a household's Internet adoption decision is examined, with emphasis on the roles that household characteristics, network externalities, and digital communication technology (DCT) infrastructure potentially play. This framework is transferred into a statistical model of household Internet access, where non-linear decomposition techniques are employed to estimate the contributions of these variables to the digital divide in a given year. Differences in Internet access rates between years are also analyzed to understand the importance of temporal resistance to the continuing digital divide.
The increasing prevalence of "high-speed" or broadband access is also taken into account by modeling a decision process where households that choose to have Internet access must decide between dial-up and high-speed access. This nested process is also decomposed in order to estimate the contributions of household characteristics, network externalities, DCT infrastructure, and temporal resistance to the high-speed digital divide.
The results suggest that public policies designed to alleviate digital divides in both general and high-speed access should focus more on the broader income and education inequities between rural and urban areas. The results also imply that the current policy environment of encouraging DCT infrastructure investment in rural areas may not be the most effective way to close the digital divide in both general and high-speed Internet access.Ph. D.
13
Slingsby, Aiden David. "Digital mapping in three dimensional space : geometry, features and access." Thesis, University College London (University of London), 2006. http://discovery.ucl.ac.uk/1445099/.
Full textAbstract:
Demand for large-scale digital vector base mapping is high, fuelled by developments in geographical information systems (GIS), spatial databases, and location-aware devices. The representation of real-world features (e.g. buildings, gardens, sheds), their properties and the spatial relationships between them are essential for supporting these types of applications and they provide an enduring focus for GIS research. There is an increasing and inevitable demand for three-dimensional (3D) however, many currently-available 3D data tend to focus on visualisation aspects, making them unsuitable for populating 3D feature-based databases for spatial analysis. The thesis considers how 3D data can be structured in order that it may be used to support applications in a GIS context. The guiding design principles used to develop the conceptual model are: establishment of a data repository to which information can be added in an in cremental fashion (in order that progress can be made without the requirement of exhaustive 3D surveys) storage of 3D geometry (facilitating the representation of complex multistorey and juxtaposed building parts) ability to describe different conceptualisations of features (e.g. 'rooms' and 'flats') and the relationships between them seamless treatment of space exterior and interior to buildings (in order to treat all space with equivalence) incorporate pedestrian accessibility (spaces are topologically connected and pedestrian access constraints are embedded) representation of a temporal dimension. The key concept is that of 'urban spaces' (discrete units of space in which human activity can occur) inside and outside buildings within the 3D environment. These are organised into layers whose surface geometries are interpolated, even where height data are poorly resolved. The thesis develops a conceptual model, implements a prototype and then illustrates its use for various applications. Particular emphasis is placed upon applications which require pedestrian access information and the definition and identification of 'spaces' and 'real-world features' in 3D built environments.
14
Garrett, Galen. "Equity of access: Exploring Internet connectivity within Oklahoma public schools." Thesis, University of North Texas, 2004. https://digital.library.unt.edu/ark:/67531/metadc4663/.
Full textAbstract:
The purpose of this study was to ascertain if conditions or combinations of conditions existed within Oklahoma public schools that created inequities in the availability of classroom Internet connections. A stratified random sample of the 471 school districts was used to identify 300 specific schools for the purpose of data analysis. Data was gathered utilizing a database provided by the Oklahoma State Department of Education and a researcher developed questionnaire. The database provided data relating to four independent variables (region, district size, school type, and school size,). The dependent variable, percentage of classrooms connected to the Internet, was obtained by the researcher designed questionnaire. The state database also provided percentage information relating to students who qualify as minorities and qualify for free or reduced lunches. The data was tested using a series of ANOVAs and a Pearson product-moment correlation coefficient. The findings of the study are as follows: (a) The analysis of variance showed that none of the independent variables had a significant effect upon the percentage of classrooms connected to the Internet; (b) The Pearson product-moment correlation coefficient revealed little or no correlation between the percentage of disadvantaged or minority students and the percentage of classroom Internet connections.
15
Ram, Shri, and Sanjay Kataria. "Facilitating access and use of Bioinformatics Information Resources through Digital Library Systems." Society for Advancement of Library and Information Science, 2006. http://hdl.handle.net/10150/106089.
Full textAbstract:
As the Recombinant DNA, Gene Cloning and DNA sequencing technologies improved in 1970s the scientists began to think about the possibilities of sequencing the 3x109 nucleotide pairs in human genome. This led to the launch of the Human Genome Project (1990), and the greatest discovery in the field of life sciences, is near to completion. Vast and ever expanding diverse information on bioinformatics resources are being developed. These include databases of biological information, software tools etc. Advances in Internet Technology have largely affected to the bioinformatics resources as heterogeneous sources of information. It facilitates the uniform access to the educational, academic and research information sources to the bioinformaticians for their research and developmental activities. This paper describes awareness about the bioinformatics information resources and digital library needs of students at Jaypee University of Information Technology, Solan (HP) and how it can be helpful to access the information resources on bioinformatics through digital library techniques.
16
Fu, Zhu. "Digital Pre-distortion for Interference Reduction in Dynamic Spectrum Access Networks." Digital WPI, 2014. https://digitalcommons.wpi.edu/etd-dissertations/152.
Full textAbstract:
Given the ever increasing reliance of today’s society on ubiquitous wireless access, the paradigm of dynamic spectrum access (DSA) as been proposed and implemented for utilizing the limited wireless spectrum more efficiently. Orthogonal frequency division multiplexing (OFDM) is growing in popularity for adoption into wireless services employing DSA frame- work, due to its high bandwidth efficiency and resiliency to multipath fading. While these advantages have been proven for many wireless applications, including LTE-Advanced and numerous IEEE wireless standards, one potential drawback of OFDM or its non-contiguous variant, NC-OFDM, is that it exhibits high peak-to-average power ratios (PAPR), which can induce in-band and out-of-band (OOB) distortions when the peaks of the waveform enter the compression region of the transmitter power amplifier (PA). Such OOB emissions can interfere with existing neighboring transmissions, and thereby severely deteriorate the reliability of the DSA network. A performance-enhancing digital pre-distortion (DPD) technique compensating for PA and in-phase/quadrature (I/Q) modulator distortions is proposed in this dissertation. Al- though substantial research efforts into designing DPD schemes have already been presented in the open literature, there still exists numerous opportunities to further improve upon the performance of OOB suppression for NC-OFDM transmission in the presence of RF front-end impairments. A set of orthogonal polynomial basis functions is proposed in this dissertation together with a simplified joint DPD structure. A performance analysis is presented to show that the OOB emissions is reduced to approximately 50 dBc with proposed algorithms employed during NC-OFDM transmission. Furthermore, a novel and intuitive DPD solution that can minimize the power regrowth at any pre-specified frequency in the spurious domain is proposed in this dissertation. Conventional DPD methods have been proven to be able to effectively reduce the OOB emissions that fall on top of adjacent channels. However more spectral emissions in more distant frequency ranges are generated by employing such DPD solutions, which are potentially in violation of the spurious emission limit. At the same time, the emissions in adjacent channel must be kept under the OOB limit. To the best of the author’s knowledge, there has not been extensive research conducted on this topic. Mathematical derivation procedures of the proposed algorithm are provided for both memoryless nonlinear model and memory-based nonlinear model. Simulation results show that the proposed method is able to provide a good balance of OOB emissions and emissions in the far out spurious domain, by reducing the spurious emissions by 4-5 dB while maintaining the adjacent channel leakage ratio (ACLR) improvement by at least 10 dB, comparing to the PA output spectrum without any DPD.
17
Chilvers, Alison H. "Managing long-term access to digital data objects : a metadata approach." Thesis, Loughborough University, 2000. https://dspace.lboro.ac.uk/2134/7239.
Full textAbstract:
As society becomes increasingly reliant on information technology for data exchange and long-term data storage the need for a system of data management to document and provide access to the 'societal memory' is becoming imperative. An examination of both the literature and current 'best practice' underlines the absence to date of a proven universal conceptual basis to digital data preservation. The examination of differences in nature and sources of origin, between traditional 'print-based' and digital objects leads to a re-appraisal of current practices of data selection and preservation. The need to embrace past, present and future metadata developments in a rapidly changing environment is considered. Various hypotheses were formulated and supported regarding: the similarities and differences required in selection criteria for different types of Digital Data Objects (DDOs), the ability to define universal threshold standards for a framework of metadata for digital data preservation, and the role of selection criteria in such a framework. The research uses Soft Systems Methodology to investigate the potential of the metadata concept as the key to universal data management. Semi-structured interviews were conducted to explore the attitudes of information professionals in the United Kingdom towards the challenges facing information-dependent organisations attempting to preserve digital data over the long-term. In particular, the nature of DDOs being encountered by stakeholders, the reasons, policies, and procedures for preserving them, together with a range of specific issues such as: the role of metadata, access to, and rights management of DDOs. The societal need for selection to ensure efficient long-term access is considered. Drawing on - SSM modelling, this research develops a flexible, long-term management framework for digital data at a level higher than metadata, with selection as an essential component. The framework's conceptual feasibility has been examined from both financial and societal benefit perspectives, together with the recognition of constraints. The super-metadata framework provides a possible systematic approach to managing a wide range of digital data in a variety of formats, created/owned by a spectrum of information-dependent organisations.
18
Lucchi, Nicola. "The role of Internet access in enabling individual’s rights and freedoms." Internationella Handelshögskolan, Högskolan i Jönköping, IHH, Redovisning och Rättsvetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-21576.
Full textAbstract:
The paper discusses the scientific and policy debate as to whether access to the Internet can be considered so fundamental for human interaction as to deserve a special legal protection. In particular, it examines the impact of computer-mediated communication on the realization of individual’s rights and freedoms as well as on democratization processes. It then considers how Internet content governance is posing regulatory issues directly related to the growing importance of an equitable access to digital information. In this regard, the paper looks at conflicts arising within the systems of rights and obligations attached to communication (and especially content provision) over the Internet. The paper finally concludes by identifying emerging tensions and drawing out the implications for the nature and definitions of rights (e.g. of communication and access, but also of intellectual property ownership) and for regulations and actions taken to protect, promote or qualify those rights. All these points are illustrated by a series of recent examples.
19
Tripathi, Manorama. "ETD initiatives: An audit of international landscape." Universidad Peruana de Ciencias Aplicadas (UPC), 2012. http://hdl.handle.net/10757/622617.
Full textAbstract:
Conferencia realizado del 12 al 14 de setiembre en Lima, Peru del 2012 en el marco del 15º Simposio Internacional de Tesis y Disertaciones Electrónicas (ETD 2012). Evento aupiciado por la Universidad Nacional Mayor de San Marcos (UNMSM) y la Universidad Peruana de Ciencias Aplicadas (UPC).Objectives: At present, libraries, worldwide, are making concerted efforts to facilitate transformation of theses to e- forms. In India, too, ETD activities are going on at an accelerated pace. The country has one of the largest educational systems across the globe. There are 634 universities and 33023 colleges in the country; every year more tan 11000 doctoral theses are awarded to the students. The University Grants Commission, (India) notification, 2009 has mandated submission of e-theses, by the research scholars, to the universities. All universities are required to setup e- theses repository to facilitate e- submission, archiving, maintenance and access to them. The paper focuses on the progress of ETD initiatives taken in India. The data is being collected through questionnaire method and whatever (information) is available in public domain in order to find out the following: 1. Current / Ongoing projects –various universities involved in ETD projects 2. Content/Total collection 3. Coverage of subject areas 4. Objectives of ETD 5. Use of software 6. Metadata schema used 7. Competency of the staff to maintain ETD 8. Policies of the universities with regard to acquisition/acceptance of etheses. 9. Policies of Government/Research Council/University Grants Commission(UGC) The paper elaborates and compares the ETD initiatives taken in UK and Australia with India. Methods: Questionnaire and whatever information is available on websites of the universities.
20
Babini, Dominique, and Pippa Smart. "Using digital libraries to provide online access to social science journals in Latin America." Association of Learned and Professional Society Publishers, 2006. http://hdl.handle.net/10150/106130.
Full textAbstract:
There is a strong history of social science research within Latin America, but its visibility (both within and outside the region) has been low for reasons of language and print distribution. The introduction of the Internet and online publication makes this information potentially more visible to the global research community, and within Latin America several organizations have undertaken to exploit this opportunity. The approaches taken show how collaboration between countries, and particularly between librarians and publishers, can provide innovative solutions. The CLACSO project uses a digital library model as a publishing platform for its member journals and this has provided a successful - and hopefully sustainable - model.
21
Lopes, Ana Patrícia da Silva. "Advanced modulation formats for optical access networks." Master's thesis, Universidade de Aveiro, 2013. http://hdl.handle.net/10773/11680.
Full textAbstract:
Mestrado em Engenharia Electrónica e TelecomunicaçõesNos últimos anos, as comunicações ópticas têm-se revelado a solução para a crescente procura de elevados ritmos de informação. De facto, nenhuma outra tecnologia (com ou sem fios) permite transmissões a Tbps, ou até dezenas de Tbps, como as comunicações ópticas permitem. Contudo, as actuais redes ópticas passivas não exibem uma capacidade agregada de fibra superior a 10 Gbps e os operadores esperam mais delas. Assim, uma evolução destas redes a médio prazo, a NG-PON2, tem sido discutida, sendo 40 e 10 Gbps as velocidades de download e upload que se preveem, respectivamente. Não obstante, estes ritmos podem não ser suficientes no futuro, com a emersão dos formatos 3D, dos novos serviços baseados em cloud computing, vídeo conferência, jogos on-line e outras/os aplicações/serviços. Neste contexto, diversos trabalhos de pesquisa têm sido efectuados. Devido á limitação do espectro e á largura de banda restrita dos dispositivos eletrónicos que complementam o sistema de transmissão óptico, elevadas eficiências espectrais são um requisito e consequentemente, a utilização de formatos de modulação avançados. A implementação intrínseca de detecção coerente e processamento digital de sinal proporcionam técnicas de compensação que melhoram o desempenho do sistema de uma forma muito significativa. Uma vez que, o crescente número de bits por símbolo exige uma maior relação sinal-ruído óptica e torna o sistema mais sensível ás não linearidades da fibra e ao ruído de fase do laser, estes algoritmos de compensação tornam-se essenciais. Esta dissertação fornece uma ampla visão dos sistemas ópticos coerentes que inclui, uma extensiva apresentação dos moduladores externos ópticos, um estudo teórico dos formatos de modulação e do formato do impulso, uma descrição de algoritmos de compensação e técnicas de detecção e finalmente, simulações e resultados laboratoriais que permitem concluir qual é o formato de modulação avançado mais indicado para transmissões ópticas a elevados ritmos.
In the last years, optical fibre communications have revealed themselves as the solution for the increasing demand of high data rates. In fact, no other communication technology (wireline or wireless) enables transmissions at Tbps, or even tens of Tbps, as optical communications do. However, the current passive optical networks do not exhibit aggregate fibre capacity beyond 10 Gbps and operators except more from them. Therefore, a middleterm evolution of these PONs, the NG-PON2, has been discussed, being 40 and 10 Gbps the predicted down- and upstream bit rates, respectively. Nevertheless, these rates upgrades may not be enough in the future, as 3D formats, new cloud computing services, videoconferencing, on-line games and alike applications/services become to emerge. In this context, much research is being carried on. Because of the limited spectrum and the restrict bandwidth of the electronic devices that complement the optical transmission system, high spectral efficiency is a requirement and consequently, the use of advanced modulation formats. The intrinsic employment of coherent detection and digital signal processing provides compensation techniques that increase hugely the performance of the system. Once the increasing number of bits per symbol requires higher optical signal-to-noise ratio and makes the system more sensitive to fibre nonlinearities and laser phase noise, these compensation algorithms become essential. This thesis provides an ample overview of coherent optical systems, which includes an extensive presentation of external modulators, a theoretical study of modulation formats and pulse shaping, a description of compensation algorithms and detection techniques and finally, simulations and laboratory results that will provide a conclusion about what is the most suited advanced modulation format for high data rates optical transmissions.
22
Islam, Mofakharul University of Ballarat. "Unsupervised Color Image Segmentation Using Markov Random Fields Model." University of Ballarat, 2008. http://archimedes.ballarat.edu.au:8080/vital/access/HandleResolver/1959.17/12827.
Full textAbstract:
We propose a novel approach to investigate and implement unsupervised segmentation of color images particularly natural color images. The aim is to devise a robust unsu- pervised segmentation approach that can segment a color textured image accurately. Here, the color and texture information of each individual pixel along with the pixel's spatial relationship within its neighborhood have been considered for producing precise segmentation of color images. Precise segmentation of images has tremendous potential in various application domains like bioinformatics, forensics, security and surveillance, the mining and material industry and medical imaging where subtle information related to color and texture is required to analyze an image accurately. We intend to implement a robust unsupervised segmentation approach for color im- ages using a newly developed multidimensional spatially variant ¯nite mixture model (MSVFMM) using a Markov Random Fields (MRF) model for improving the over- all accuracy in segmentation and Haar wavelet transform for increasing the texture sensitivity of the proposed approach. [...]Master of Computing
23
Spencer, Beth University of Ballarat. "The Body as Fiction / Fiction as a Way of Thinking: On Writing A Short (Personal) History of the Bra and its Contents." University of Ballarat, 2006. http://archimedes.ballarat.edu.au:8080/vital/access/HandleResolver/1959.17/12813.
Full textAbstract:
This thesis uses fiction as a research technology for investigating and thinking about issues to do with bodies and knowledge at the cusp of the 20th and 21st centuries. It includes sample material from a novel in progress -- A Short (Personal) History of the Bra and its Contents -- to illustrate some of the unique outcomes of this approach to exploring cultural history and writing cultural criticism. One of the advantages of fiction is that it allows me to create a discursive field in which it is possible for the very wide range of issues raised by my topic to coexist, work off each other and cross-fertilise. These include ideas regarding gender, sexuality, nurture and subjectivity; issues to do with the implants controversy, the cancer industry and the corporatisation of medicine (and hence various current debates within science and medicine); as well as movements in fashion history and popular culture -- all of which contribute to making up the datasphere in which and through which we continually reproduce ourselves as subjects. [...]Doctor of Philosophy
24
Dafik, University of Ballarat. "Structural Properties and Labeling of Graphs." University of Ballarat, 2007. http://archimedes.ballarat.edu.au:8080/vital/access/HandleResolver/1959.17/12809.
Full textAbstract:
The complexity in building massive scale parallel processing systems has re- sulted in a growing interest in the study of interconnection networks design. Network design affects the performance, cost, scalability, and availability of parallel computers. Therefore, discovering a good structure of the network is one of the basic issues. From modeling point of view, the structure of networks can be naturally stud- ied in terms of graph theory. Several common desirable features of networks, such as large number of processing elements, good throughput, short data com- munication delay, modularity, good fault tolerance and diameter vulnerability correspond to properties of the underlying graphs of networks, including large number of vertices, small diameter, high connectivity and overall balance (or regularity) of the graph or digraph. The first part of this thesis deals with the issue of interconnection networks ad- dressing system. From graph theory point of view, this issue is mainly related to a graph labeling. We investigate a special family of graph labeling, namely antimagic labeling of a class of disconnected graphs. We present new results in super (a; d)-edge antimagic total labeling for disjoint union of multiple copies of special families of graphs. The second part of this thesis deals with the issue of regularity of digraphs with the number of vertices close to the upper bound, called the Moore bound, which is unobtainable for most values of out-degree and diameter. Regularity of the underlying graph of a network is often considered to be essential since the flow of messages and exchange of data between processing elements will be on average faster if there is a similar number of interconnections coming in and going out of each processing element. This means that the in-degree and out-degree of each processing element must be the same or almost the same. Our new results show that digraphs of order two less than Moore bound are either diregular or almost diregular.Doctor of Philosophy
25
Hafetz, Nina University of Ballarat. "DSM-IV AD/HD symptoms: Prevalence, gender and age differences, and construct validity of parent and teacher ratings of Malaysian children." University of Ballarat, 2007. http://archimedes.ballarat.edu.au:8080/vital/access/HandleResolver/1959.17/12807.
Full textAbstract:
Attention-deficit/hyperactivity disorder (AD/HD) is marked by deficits in attention, hyperactivity and impulsivity (American Psychiatric Association, 1994). The current DSM-IV conceptualisation of AD/HD as comprising of separate, but related, Inattention (IA) and Hyperactivity/Impulsivity (H/I) dimensions have been supported in confirmatory factor analytic (CFA) studies. Despite being one of the most extensively studied childhood disorder, there is a lack of research on AD/HD in non-western populations. Research on AD/HD in Asian countries, particularly, is limited. To date, no study has comprehensively investigated the characteristics of AD/HD in a Malaysian sample. The current study had 4 major aims. The first aim of the study was to investigate how the IA and H/I symptoms groups vary by age, gender, and age by gender interaction. The second aim of the study was to obtain prevalence rates of DSM-IV AD/HD and the three subtypes (i.e., Predominantly Inattentive Type, AD/HD-IA; Predominantly Hyperactive/Impulsive Type, AD/HD-H/I; and Combined Type, AD/HD-C) within this population. This was examined for boys and girls separately, and together. The third aim of the study was to investigate the internal validity of DSM-IV AD/HD using single source confirmatory factor analysis (CFA), while the fourth aim of the study was to examine trait, source and error variance of the AD/HD symptoms using the CFA multitrait (IA and H/I) by multisource (parent and teacher) approach (CFA MT-MS). All the CFA and CFA MT-MS analyses were conducted separately for boys and girls and used scores recoded via the binary method, as opposed to the ordinal scoring method. The sample consisted of 934 Malaysian schoolchildren aged 6-12 years (436 boys: mean age 8.86 years; and 498 girls: mean age 9.02 years) [...] There was more source than trait variance for parent rated H/I and teacher rated IA for girls. Unique to the current study is the use of binary as opposed to ordinal data to run the CFA and MTMS analysis. The implications of the findings for the conceptualisation, assessment, treatment, psychometric properties of AD/HD rating scales and the recognition of AD/HD in the Malaysian population are discussed. Suggestions for future research are offered.Doctor of Psychology (Clinical)
26
Douglas, Fabian University of Ballarat. "The sun-moths (lepidoptera: castniidae) of Victoria, with a detailed study of the pale sun-moth (Synemon selene klug, 1850)." University of Ballarat, 2007. http://archimedes.ballarat.edu.au:8080/vital/access/HandleResolver/1959.17/12787.
Full textAbstract:
The sun-moths (family Castniidae) are a distinctive group of monocot-feeding diurnal Lepidoptera that contains a high proportion of threatened species worldwide. Seven of the eight Victorian Synemon species are considered as threatened. This study has determined through extensive fieldwork that most of these species are now restricted to very small remnants of their particular habitats. These findings have been integrated into a review of the current distribution, biology and habitat requirements of all the Victorian species. This has enabled recommendations for their long-term conservation and management to be made. Special attention was paid to the Pale Sun-moth (Synemon selene Klug, 1850) because it appeared to be nationally endangered and without a government strategy for its conservation. Also, there was strong circumstantial evidence of complete parthenogenesis within all of its Victorian populations. The Victorian occurrences are shown to be parthenogenetic, although specimens of both sexes are known from a ?now-extinct population near Two Wells, South Australia. It was also established that these parthenogenetic populations include five distinct morphs, two or three of which occur sympatrically at four localities in the Wimmera area. Parthenogenetic populations of these morphs cannot interbreed, this potentially restricting their genetic diversity. The extent of genetic diversity was examined with all parthenogenetic Victorian morphs of S. selene. DNA sequencing of 1515 bp of the COI gene revealed a maximum divergence level of 12 bp between some of the morphs and 1 to 2 bp within some morphs. This level of genetic diversity implies that these morphs have continued to evolve in the absence of males through time. This study has highlighted the special academic interest of S. selene and the urgent need for its adequate conservation. Some important directions for future research on the species are also discussed.Master of Applied Science
27
Calderone, Ursula University of Ballarat. "I hope that I have got some art." University of Ballarat, 2008. http://archimedes.ballarat.edu.au:8080/vital/access/HandleResolver/1959.17/12783.
Full textAbstract:
In this thesis I have researched what I believe is the powerful, catalytic effect of poetry on the creative work of some artists. I have chosen three, Australian painters; Sidney Nolan, James Gleeson and Brett Whiteley. I have looked carefully at how the works of various poets have influenced and inspired these artists. I have put forward the idea that this engagement with the poetic realm has greatly enhanced the artist’s creative form-making. Indeed these artists have acknowledged their strong links with the world of poetry. I have touched very briefly on the ideas of some renowned philosophers who stress society’s need for fine works of art. In my opinion great works of art can come from this linking of painting with poetry and therefore, this nexus is to be encouraged. I have in my own painterly works looked to the poets for inspiration. In The Wimmera Series of landscape works, I read Brian Edwards’ and Homer Reith’s poetry, and found in their imagery a rich source of creative ideas. I continued to read the works of the poets and found that the poetry of Ezra Pound, Dante Alighieri, Judith Wright and the works of many others, were an inspirational and catalytic force. I have also discovered on this artistic journey that the very writing of poetry, my own attempts in this field, seemed to bring to my painting, a sharper, a more analytical and critical focus. Renowned art critics and art historians have criticised contemporary art for its lack of the poetic, and its boring shallowness. I would urge artists to engage with the poetic realm, and this interplay between painting and poetry, may produce fine works of lasting greatness.Master of Visual Arts
28
Owen, Karen. "The Sexual Beliefs, Attitudes And Script Of Men Convicted Of Sexual Offences Against Children: An Empirical Investigation." University of Ballarat, 2007. http://archimedes.ballarat.edu.au:8080/vital/access/HandleResolver/1959.17/12775.
Full textAbstract:
Community concern about sexual offending places continued pressure on correctional services to refine treatment and reduce re-offending. While cognitive processes have been identified as a key element in the development and maintenance of sexual offending, more research on the precise nature of these processes is required. The current study, based on Ward and Siegert’s Pathways Model, involved 100 male offenders of various types: 25 intra – familial sex offenders against children, 25 extra-familial sex offenders against children, 25 sex offenders who chose adult victims, and 25 convicted of non-sexual offences. There was also a control group of 25 non-offenders. The quantitative data, derived from a series of questionnaires concerning childhood and sexual experiences, provided evidence that the two types of child sex offender differed from the other groups with respect to their expectations of sexual behaviour among children, their experience of sexual abuse and neglect as children themselves, and, paradoxically, their current high self-esteem. In addition, scripts relating to hypothetical consenting adult sexual relations and sexual contact with a child were collected from the 50 sex offenders against children. The script content suggested that, compared with intra - familial offenders, extra-familial offenders had notably unrealistic, naïve and romanticised scripts for adult relationships and more sophisticated scripts for offences against children. The latter suggested that scripts might serve as a mediating function in offending behaviour and that offenders acquired a degree of task domain expertise. Despite some inherent problems undertaking research with the sex-offender population, the findings confirmed that sex-offenders do not constitute a homogenous group and that the pathways model offers a unique perspective on how males become and develop their capacity as sex-offenders, how they sustain a positive view of themselves, and how they continue to commit offences. Finally, the model was considered in terms of its capacity to suggest ways to better target treatment efforts to specific groups of sexual offenders to further reduce their rate of recidivismDoctor of Psychology (Clinical)
29
Purtill, Marie University of Ballarat. "An Investigation into Spring Water." University of Ballarat, 2008. http://archimedes.ballarat.edu.au:8080/vital/access/HandleResolver/1959.17/12754.
Full textAbstract:
This exegesis explores the sacred, holy and commercial aspects of spring water as revealed by an exploration of the relationships of Indigenous Australians and non–Indigenous European Australians to spring water. As a non–Indigenous Australian migrant, my knowledge of Indigenous Australian spiritual and cultural matters was limited, as was knowledge of Indigenous Australian history, both pre- and post-European settlement. As a migrant, I have many memories and experiences of spring water at European wells, springs and places of pilgrimage where healing, both physical and spiritual was sought. In childhood, I enjoyed reading the many myths and legends that surround the magical, mysterious and often invisible resource of spring water. Realising that my current knowledge of spring water relied more on folklore and anecdotal information than on fact, I decided that the topic of spring water offered worthwhile opportunities for research. [...] The availability of spring water is being challenged on more than one front. This research explores and investigates the abundance of (particularly) art references to spring water in Indigenous Australian culture and traditions, while noting the dearth of art references relating specifically to spring water in non-Indigenous Australian culture; although an abundance of art references to water in general is revealed. In the latter context, references to art depicting aspects of the hydrologic cycle have been substituted and explored.Master of Arts
30
Donald, Colin University of Ballarat. "Reflective space: A personal journey towards a re-envisioning of the Australian landscape." University of Ballarat, 2008. http://archimedes.ballarat.edu.au:8080/vital/access/HandleResolver/1959.17/12731.
Full textAbstract:
Whilst the notion of the ‘Reflective Space’ could arguably encompass many conceptual positions and propositions, for the purposes of this research investigation the ‘Reflective Space’ referred to in the title of this exegesis will focus upon what I consider as an emerging and growing consciousness of the natural world. As a theoretical and conceptual construct, the investigation considers how this growing consciousness can be seen to be expressed through the medium of representations of the Australian landscape. This work considers a number of contemporary theoretical positions and a number of relevant social and political questions; it also acknowledges that within such spheres of reflection, the issue of being sustainable in relation to our interactions and perceptions of this natural world looms as perhaps one of the most pressing of our time. While it will be acknowledged that the depiction of landscape enjoys a long-standing tradition within the Australian cultural mind, the suggestion will be made that certain aspects of these visualisations can be seen to be ‘reflective’ of a visual, cultural and physical degradation, and indeed even an apprehension of the physical ‘space’ that is represented as landscape. The investigation considers and reflects upon what can be observed as contentious and ambivalent attitudes expressed towards landscape perceived through works of art. Strategies for adopting a perceptual visual ethic grounded within the concepts and principles of sustainability will be presented for consideration. By applying such modes of interpretation to perceptions of land and landscape depiction, new appreciations for the cultural ‘space’ that is landscape will be developed. Such understandings will consider and reflect upon the temporal nature of our natural world. The thesis is this: that to be able to think and act in a sustainable fashion in relation to our environment, our perceptions and interpretations of visualisations of landscape must include a recognition that the land is a ‘temporal’ space, in which past and possible futures are immanent in the present.PhD (Visual Arts)
31
Islam, Mofakharul. "Unsupervised color image segmentation using Markov Random Fields Model." University of Ballarat, 2008. http://archimedes.ballarat.edu.au:8080/vital/access/HandleResolver/1959.17/15694.
Full textAbstract:
We propose a novel approach to investigate and implement unsupervised segmentation of color images particularly natural color images. The aim is to devise a robust unsu- pervised segmentation approach that can segment a color textured image accurately. Here, the color and texture information of each individual pixel along with the pixel's spatial relationship within its neighborhood have been considered for producing precise segmentation of color images. Precise segmentation of images has tremendous potential in various application domains like bioinformatics, forensics, security and surveillance, the mining and material industry and medical imaging where subtle information related to color and texture is required to analyze an image accurately. We intend to implement a robust unsupervised segmentation approach for color im- ages using a newly developed multidimensional spatially variant ¯nite mixture model (MSVFMM) using a Markov Random Fields (MRF) model for improving the over- all accuracy in segmentation and Haar wavelet transform for increasing the texture sensitivity of the proposed approach. [...]Master of Computing
32
Spencer, Beth. "The Body as Fiction / Fiction as a Way of Thinking: On Writing A Short (Personal) History of the Bra and its Contents." University of Ballarat, 2006. http://archimedes.ballarat.edu.au:8080/vital/access/HandleResolver/1959.17/15469.
Full textAbstract:
This thesis uses fiction as a research technology for investigating and thinking about issues to do with bodies and knowledge at the cusp of the 20th and 21st centuries. It includes sample material from a novel in progress -- A Short (Personal) History of the Bra and its Contents -- to illustrate some of the unique outcomes of this approach to exploring cultural history and writing cultural criticism. One of the advantages of fiction is that it allows me to create a discursive field in which it is possible for the very wide range of issues raised by my topic to coexist, work off each other and cross-fertilise. These include ideas regarding gender, sexuality, nurture and subjectivity; issues to do with the implants controversy, the cancer industry and the corporatisation of medicine (and hence various current debates within science and medicine); as well as movements in fashion history and popular culture -- all of which contribute to making up the datasphere in which and through which we continually reproduce ourselves as subjects. [...]Doctor of Philosophy
33
Purtill, Marie. "An Investigation into spring water." University of Ballarat, 2008. http://archimedes.ballarat.edu.au:8080/vital/access/HandleResolver/1959.17/15380.
Full textAbstract:
This exegesis explores the sacred, holy and commercial aspects of spring water as revealed by an exploration of the relationships of Indigenous Australians and non–Indigenous European Australians to spring water. As a non–Indigenous Australian migrant, my knowledge of Indigenous Australian spiritual and cultural matters was limited, as was knowledge of Indigenous Australian history, both pre- and post-European settlement. As a migrant, I have many memories and experiences of spring water at European wells, springs and places of pilgrimage where healing, both physical and spiritual was sought. In childhood, I enjoyed reading the many myths and legends that surround the magical, mysterious and often invisible resource of spring water. Realising that my current knowledge of spring water relied more on folklore and anecdotal information than on fact, I decided that the topic of spring water offered worthwhile opportunities for research. [...] The availability of spring water is being challenged on more than one front. This research explores and investigates the abundance of (particularly) art references to spring water in Indigenous Australian culture and traditions, while noting the dearth of art references relating specifically to spring water in non-Indigenous Australian culture; although an abundance of art references to water in general is revealed. In the latter context, references to art depicting aspects of the hydrologic cycle have been substituted and explored.Master of Arts
34
Hafetz, Nina. "DSM-IV AD/HD symptoms: Prevalence, gender and age differences, and construct validity of parent and teacher ratings of Malaysian children." University of Ballarat, 2007. http://archimedes.ballarat.edu.au:8080/vital/access/HandleResolver/1959.17/14638.
Full textAbstract:
Attention-deficit/hyperactivity disorder (AD/HD) is marked by deficits in attention, hyperactivity and impulsivity (American Psychiatric Association, 1994). The current DSM-IV conceptualisation of AD/HD as comprising of separate, but related, Inattention (IA) and Hyperactivity/Impulsivity (H/I) dimensions have been supported in confirmatory factor analytic (CFA) studies. Despite being one of the most extensively studied childhood disorder, there is a lack of research on AD/HD in non-western populations. Research on AD/HD in Asian countries, particularly, is limited. To date, no study has comprehensively investigated the characteristics of AD/HD in a Malaysian sample. The current study had 4 major aims. The first aim of the study was to investigate how the IA and H/I symptoms groups vary by age, gender, and age by gender interaction. The second aim of the study was to obtain prevalence rates of DSM-IV AD/HD and the three subtypes (i.e., Predominantly Inattentive Type, AD/HD-IA; Predominantly Hyperactive/Impulsive Type, AD/HD-H/I; and Combined Type, AD/HD-C) within this population. This was examined for boys and girls separately, and together. The third aim of the study was to investigate the internal validity of DSM-IV AD/HD using single source confirmatory factor analysis (CFA), while the fourth aim of the study was to examine trait, source and error variance of the AD/HD symptoms using the CFA multitrait (IA and H/I) by multisource (parent and teacher) approach (CFA MT-MS). All the CFA and CFA MT-MS analyses were conducted separately for boys and girls and used scores recoded via the binary method, as opposed to the ordinal scoring method. The sample consisted of 934 Malaysian schoolchildren aged 6-12 years (436 boys: mean age 8.86 years; and 498 girls: mean age 9.02 years) [...] There was more source than trait variance for parent rated H/I and teacher rated IA for girls. Unique to the current study is the use of binary as opposed to ordinal data to run the CFA and MTMS analysis. The implications of the findings for the conceptualisation, assessment, treatment, psychometric properties of AD/HD rating scales and the recognition of AD/HD in the Malaysian population are discussed. Suggestions for future research are offered.Doctor of Psychology (Clinical)
35
Donald, Colin. "Reflective space: A personal journey towards a re-envisioning of the Australian landscape." University of Ballarat, 2008. http://archimedes.ballarat.edu.au:8080/vital/access/HandleResolver/1959.17/14623.
Full textAbstract:
Whilst the notion of the ‘Reflective Space’ could arguably encompass many conceptual positions and propositions, for the purposes of this research investigation the ‘Reflective Space’ referred to in the title of this exegesis will focus upon what I consider as an emerging and growing consciousness of the natural world. As a theoretical and conceptual construct, the investigation considers how this growing consciousness can be seen to be expressed through the medium of representations of the Australian landscape. This work considers a number of contemporary theoretical positions and a number of relevant social and political questions; it also acknowledges that within such spheres of reflection, the issue of being sustainable in relation to our interactions and perceptions of this natural world looms as perhaps one of the most pressing of our time. While it will be acknowledged that the depiction of landscape enjoys a long-standing tradition within the Australian cultural mind, the suggestion will be made that certain aspects of these visualisations can be seen to be ‘reflective’ of a visual, cultural and physical degradation, and indeed even an apprehension of the physical ‘space’ that is represented as landscape. The investigation considers and reflects upon what can be observed as contentious and ambivalent attitudes expressed towards landscape perceived through works of art. Strategies for adopting a perceptual visual ethic grounded within the concepts and principles of sustainability will be presented for consideration. By applying such modes of interpretation to perceptions of land and landscape depiction, new appreciations for the cultural ‘space’ that is landscape will be developed. Such understandings will consider and reflect upon the temporal nature of our natural world. The thesis is this: that to be able to think and act in a sustainable fashion in relation to our environment, our perceptions and interpretations of visualisations of landscape must include a recognition that the land is a ‘temporal’ space, in which past and possible futures are immanent in the present.PhD (Visual Arts)
36
Douglas, Fabian. "The sun-moths (lepidoptera: castniidae) of Victoria, with a detailed study of the pale sun-moth (Synemon selene klug, 1850)." University of Ballarat, 2007. http://archimedes.ballarat.edu.au:8080/vital/access/HandleResolver/1959.17/14621.
Full textAbstract:
The sun-moths (family Castniidae) are a distinctive group of monocot-feeding diurnal Lepidoptera that contains a high proportion of threatened species worldwide. Seven of the eight Victorian Synemon species are considered as threatened. This study has determined through extensive fieldwork that most of these species are now restricted to very small remnants of their particular habitats. These findings have been integrated into a review of the current distribution, biology and habitat requirements of all the Victorian species. This has enabled recommendations for their long-term conservation and management to be made. Special attention was paid to the Pale Sun-moth (Synemon selene Klug, 1850) because it appeared to be nationally endangered and without a government strategy for its conservation. Also, there was strong circumstantial evidence of complete parthenogenesis within all of its Victorian populations. The Victorian occurrences are shown to be parthenogenetic, although specimens of both sexes are known from a ?now-extinct population near Two Wells, South Australia. It was also established that these parthenogenetic populations include five distinct morphs, two or three of which occur sympatrically at four localities in the Wimmera area. Parthenogenetic populations of these morphs cannot interbreed, this potentially restricting their genetic diversity. The extent of genetic diversity was examined with all parthenogenetic Victorian morphs of S. selene. DNA sequencing of 1515 bp of the COI gene revealed a maximum divergence level of 12 bp between some of the morphs and 1 to 2 bp within some morphs. This level of genetic diversity implies that these morphs have continued to evolve in the absence of males through time. This study has highlighted the special academic interest of S. selene and the urgent need for its adequate conservation. Some important directions for future research on the species are also discussed.Master of Applied Science
37
Calderone, Ursula. "I hope that I have got some art." University of Ballarat, 2008. http://archimedes.ballarat.edu.au:8080/vital/access/HandleResolver/1959.17/14619.
Full textAbstract:
In this thesis I have researched what I believe is the powerful, catalytic effect of poetry on the creative work of some artists. I have chosen three, Australian painters; Sidney Nolan, James Gleeson and Brett Whiteley. I have looked carefully at how the works of various poets have influenced and inspired these artists. I have put forward the idea that this engagement with the poetic realm has greatly enhanced the artist’s creative form-making. Indeed these artists have acknowledged their strong links with the world of poetry. I have touched very briefly on the ideas of some renowned philosophers who stress society’s need for fine works of art. In my opinion great works of art can come from this linking of painting with poetry and therefore, this nexus is to be encouraged. I have in my own painterly works looked to the poets for inspiration. In The Wimmera Series of landscape works, I read Brian Edwards’ and Homer Reith’s poetry, and found in their imagery a rich source of creative ideas. I continued to read the works of the poets and found that the poetry of Ezra Pound, Dante Alighieri, Judith Wright and the works of many others, were an inspirational and catalytic force. I have also discovered on this artistic journey that the very writing of poetry, my own attempts in this field, seemed to bring to my painting, a sharper, a more analytical and critical focus. Renowned art critics and art historians have criticised contemporary art for its lack of the poetic, and its boring shallowness. I would urge artists to engage with the poetic realm, and this interplay between painting and poetry, may produce fine works of lasting greatness.Master of Visual Arts
38
Jagodic, Jana. "The role of an ICT change agent in ICT diffusion within technology projects in public and private sector setting." University of Ballarat, 2008. http://archimedes.ballarat.edu.au:8080/vital/access/HandleResolver/1959.17/14613.
Full textAbstract:
Rapid changes in the competitive environment and increasing customer demands drive the public and private sectors to innovate by continually investing millions of dollars in Information and Communication Technology (ICT) projects. Basically, organisations depend on ICT technology for every part of their business. Companies are not only challenged to apply new technologies to remain competitive, they also need to spread (diffuse), manage and implement technological innovation across extended organisational boundaries. Diffusion, management and implementation of ICT innovation involve a considerable amount of risk and potentially protracted delays of technological projects. As a consequence of high demand for ICT innovation, as well as the risk of failure, a wide range of organisations such as state agencies and banks now employ so-called change agents to diffuse, manage and implement innovation within technological projects. While a large number of academics and practitioners are concerned with change agents who alter organisational culture, structure and processes, relatively little research has been undertaken on the role of ICT change agents in the innovation process. Thus, this professional doctorate study aims to fill that gap by exploring ICT change agents’ project work experiences within state agencies and banks and fuse them with theory. The research is based on case study methodology, including 41 cases within 12 target organisations in Australia and Germany. As a former ICT change agent, the researcher of this Doctor of Business Administration (DBA) study applied mixed research methods, also incorporating her ICT project experiences by using an individual reflection model. From this investigation emerged that change agents’ roles are embedded in components (organisational structure, project stages) and processes (ICT diffusion, informal networks). These findings underpin the model of ICT change agents who perform the multiple linker roles of these components and processes in order to deliver set project outcomes. The model is designed to inform practice by providing guidance for advanced ICT change agents’ training in public and private sector settings.Doctor of Business Administration
39
Dafik. "Structural Properties and Labeling of Graphs." University of Ballarat, 2007. http://archimedes.ballarat.edu.au:8080/vital/access/HandleResolver/1959.17/13722.
Full textAbstract:
The complexity in building massive scale parallel processing systems has re- sulted in a growing interest in the study of interconnection networks design. Network design affects the performance, cost, scalability, and availability of parallel computers. Therefore, discovering a good structure of the network is one of the basic issues. From modeling point of view, the structure of networks can be naturally stud- ied in terms of graph theory. Several common desirable features of networks, such as large number of processing elements, good throughput, short data com- munication delay, modularity, good fault tolerance and diameter vulnerability correspond to properties of the underlying graphs of networks, including large number of vertices, small diameter, high connectivity and overall balance (or regularity) of the graph or digraph. The first part of this thesis deals with the issue of interconnection networks ad- dressing system. From graph theory point of view, this issue is mainly related to a graph labeling. We investigate a special family of graph labeling, namely antimagic labeling of a class of disconnected graphs. We present new results in super (a; d)-edge antimagic total labeling for disjoint union of multiple copies of special families of graphs. The second part of this thesis deals with the issue of regularity of digraphs with the number of vertices close to the upper bound, called the Moore bound, which is unobtainable for most values of out-degree and diameter. Regularity of the underlying graph of a network is often considered to be essential since the flow of messages and exchange of data between processing elements will be on average faster if there is a similar number of interconnections coming in and going out of each processing element. This means that the in-degree and out-degree of each processing element must be the same or almost the same. Our new results show that digraphs of order two less than Moore bound are either diregular or almost diregular.Doctor of Philosophy
40
謝正學 and Ching-hok Tse. "A digital-implementation technique for a new multitone code-division-multiple-access system." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B31226784.
Full text
41
Tse, Ching-hok. "A digital-implementation technique for a new multitone code-division-multiple-access system /." Hong Kong : University of Hong Kong, 2001. http://sunzi.lib.hku.hk/hkuto/record.jsp?B25100774.
Full text
42
Meng, Chulin. "Using query-based concept structures to improve subject access to digital libraries." School of Communication & Information, Nanyang Technological University, 2006. http://hdl.handle.net/10150/106185.
Full textAbstract:
From the early information retrieval systems to recent web search engines, most systems ask user to express their information need in a query. While the online information systems, such as search engines and digital libraries, bring the great opportunity of accessing huge amount of information directly, they also present challenges on users’ competence of formulating good queries. In library, thesauri and classification schemes are not only indexing tools, but also concept consultation tools. Thesauri and classification schemes haven’t fully adapted in to digital library and IR system, because there are not universal concept hierarchies. This essay introduces the ideal of using query-based concept structures to improve subject access to digital libraries. It reports some early work of an ongoing project that explores the usability and effectiveness of query-based concept structures, which naturally connects static knowledge in the information collection and user dynamic information need, as intermediary. Methodologies and experimental designs are laid out. The preliminary results are presented and further research is discussed.
43
Khoshbin-Ghomash, Hossein. "Multiple-access interference rejecting receivers in DS-CDMA communication system." Thesis, University of Bath, 2000. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323569.
Full text
44
Das, Anup Kumar. "Open Access to Knowledge and Information: Scholarly Literature and Digital Library Initiatives - the South Asian Scenario." UNESCO, New Delhi, 2008. http://hdl.handle.net/10150/106335.
Full textAbstract:
The South Asia sub-region is now in the forefront of the Open Access movement within developing countries in the world, with India being the most prominent partner in terms of its successful Open Access and Digital Library initiatives. Institutional and policy frameworks in India also facilitate innovative solutions for increasing international visibility and accessibility of scholarly literature and documentary heritage in this country.
This publication has its genesis in the recommendations and proceedings of UNESCO-supported international conferences and workshops including the 4th International Conference of Asian Digital Libraries (ICADL2001, Bangalore); the International Conferences on Digital Libraries (ICDL2004 & ICDL2006, New Delhi); and the International Workshop on Greenstone Digital Library Software (2006, Kozhikode), where many information professionals of this sub-region demonstrated their Digital Library and Open Access initiatives. This book describes successful digital library and open access initiatives in the South Asia sub-region that are available in the forms of open courseware, open access journals, metadata harvesting services, national-level open access repositories and institutional repositories. This book may be considered an authoritative Source-book on Open Access development in this sub-region.
45
Wertlen, Ronald. "A P2P middleware design for digital access nodes in marginalised rural areas." Thesis, University of Fort Hare, 2010. http://hdl.handle.net/10353/254.
Full textAbstract:
This thesis addresses software design within the field of Information and Communications Technology for Development (ICTD). Specifically, it makes a case for the design and development of software which is custom-made for the context of marginalised rural areas (MRAs). One of the main aims of any ICTD project is sustainability and such sustainability is particularly difficult in MRAs because of the high costs of projects located there. Most literature on ICTD projects focuses on other factors, such as management, regulations, social and community issues when discussing this issue. Technical matters are often down-played or ignored entirely. This thesis argues that MRAs exhibit unique technical characteristics and that by understanding these characteristics, one can possibly design more cost-effective software. One specific characteristic is described and addressed in this thesis – a characteristic we describe here for the first time and call a network island. Further analysis of the literature generates a picture of a distributed network of access nodes (DANs) within such network islands, which are connected by high speed networks and are able to share resources and stimulate usage of technology by offering a wide range of services. This thesis attempts to design a fitting middleware platform for such a context, which would achieve the following aims: i) allow software developers to create solutions for the context more efficiently (correctly, rapidly); ii) stimulate product managers and business owners to create innovative software products more easily (cost-effectively). A given in the context of this thesis is that the software should use free/libre open source software (FLOSS) – good arguments do also exist for the use of FLOSS. A review of useful FLOSS frameworks is undertaken and several of these are examined in an applied part of the thesis, to see how useful they may be. They form the basis for a walking skeleton implementation of the proposed middleware. The Spring framework is the basis for experiments, along with Spring-Webservices, JMX and PHP 5’s web service capabilities. This thesis builds on three years of work at the Siyakhula Living Lab (SLL), an experimental testbed in a MRA in the Mbashe district of the Eastern Cape of South Africa. Several existing products are deployed at the SLL in the fields of eCommerce, eGovernment and eLearning. Requirements specifications are engineered from a variety of sources, including interviews, mailing lists, the author’s experience as a supervisor at the SLL, and a review of the existing SLL products. Future products are also investigated, as the thesis considers current trends in ICTD. Use cases are also derived and listed. Most of the use cases are concerned with management functions of DANs that can be automated, so that operators of DANs can focus on their core business and not on technology. Using the UML Components methodology, the thesis then proceeds to design a middleware component architecture that is derived from the requirements specification. The process proceeds step-by-step, so that the reader can follow how business rules, operations and interfaces are derived from the use cases. Ultimately, the business rules, interfaces and operations are related to business logic, system interfaces and operations that are situated in specific components. The components in turn are derived from the business information model, that is derived from the business concepts that were initially used to describe the context for the requirements engineering. In this way, a logical method for software design is applied to the problem domain to methodically derive a software design for a middleware solution. The thesis tests the design by considering possible weaknesses in the design. The network aspect is tested by interpolating from formal assumptions about the nature of the context. The data access layer is also identified as a possible bottleneck. We suggest the use of fast indexing methods instead of relational databases to maintain flexibility and efficiency of the data layer. Lessons learned from the exercise are discussed, within the context of the author’s experience in software development teams, as well as in ICTD projects. This synthesis of information leads to warnings about the psychology of middleware development. We note that the ICTD domain is a particularly difficult one with regards to software development as business requirements are not usually clearly formulated and developers do not have the requisite domain knowledge. In conclusion, the core arguments of the thesis are recounted in a bullet form, to lay bare the reasoning behind this work. Novel aspects of the work are also highlighted. They include the description of a network island, and aspects of the DAN middleware requirements engineering and design. Future steps for work based on this thesis are mapped out and open problems relating to this research are touched upon.
46
Goodman, David. "Open Access: What Comes Next." Association of Learned and Professional Society Publishers, 2005. http://hdl.handle.net/10150/105958.
Full textAbstract:
Please see the revised version
"Open Access: What Comes Next After 2004"
(also in this archive)This article examines the effects that present decisions about open access (OA) will have over the next ten years. It will be shown that the consequences are affected both by deliberate choices of policy by librarians and publishers, as well as by the adoption of various alternatives by scientific authors. The eventual result could be excellent, or quite otherwise.
47
Näder, Johannes. "Open Access." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-160760.
Full textAbstract:
Seit der Jahrtausendwende prägt das Schlagwort Open Access die Debatten um wissenschaftliches Publizieren. Je nach Kontext geht es dabei um handfeste Strategien angesichts der Zeitschriftenkrise, um ein mehr oder weniger einheitliches Programm zur Verabschiedung des Gutenberg-Zeitalters oder um visionäre Vorstellungen digitaler Wissenskulturen.
Die Untersuchung verfolgt zwei Ziele: Zunächst erklärt sie, auf welche Konzepte sich der Begriff Open Access bezieht, wie sich diese Konzepte entwickelt haben und wie sie zusammenfassend beschrieben werden können. Diese Betrachtungsweise ermöglicht es, Open Access in einem zweiten Schritt aus seiner strategischen und programmatischen Funktionalisierung zu lösen und medien-/kulturwissenschaftlich zu deuten: Nicht zufällig entsteht die Open-Access-Bewegung zu einem Zeitpunkt, da sich die medientechnischen Infrastrukturen der Gesellschaft und damit auch der Wissenschaft tiefgreifend verändern. Die Untersuchung analysiert Open Access als den Versuch der Wissenschaftsgemeinschaft, durch die Beeinflussung des Mediensystems auch unter veränderten medialen Bedigungen wissenschaftliche Öffentlichkeit herstellen zu können und dabei Verwerfungen für wissenschaftliche Arbeitsabläufe und für das gesamte Wissenssystem zu vermeiden.
Dabei wird deutlich, dass verschiedene Disziplinen unterschiedliche Anforderungen an wissenschaftliche Öffentlichkeit haben und dass daher Aushandlungsprozesse nötig sind. Gleichzeitig reflektiert die Untersuchung, dass es sich bei den gerade entstehenden neuen Medieninfrastrukturen genau wie beim sich wandelnden wissenschaftlichen Publikationswesen um fragile, grundsätzlich kontingente Strukturen handelt, deren Zukunft keineswegs gesichert ist: Statt Open Access könnten sich auch andere Organisationsformen wissenschaftlicher Öffentlichkeit im digitalen Zeitalter etablieren, die aber nicht unbedingt im Sinne eines offenen und produktiven wissenschaftlichen Austausches und einer breiten gesellschaftlichen Partizipation an wissenschaftlicher Kultur sein müssen. Open Access erscheint vor diesem Hintergrund als vorsichtiger und vergleichweise schadensarmer Aushandlungsprozess, nicht als radikale Revolution des Wissenschaftssystems an der Schwelle zum digitalen Zeitalter.
Methodisch knüpft die Untersuchung an die Mediologie an, die durch die Beschreibung von Wechselwirkungen zwischen technischen Medien und kulturellen Praxen die Konstruktion einseitiger Kausalzusammenhänge vermeiden will. In einem Exkurs wird untersucht, worin sich die Konzepte von Open Access und Open Source bzw. Freier Software unterscheiden. Der Anhang der Arbeit enthält den Volltext der drei Erklärungen von Budapest, Bethesda und Berlin, in denen wichtige Prinzipien von Open Access niedergelegt sind.
48
Hornery, Daniel University of Ballarat. "A comprehensive profile of elite tennis and strategies to enhance match play performance." University of Ballarat, 2006. http://archimedes.ballarat.edu.au:8080/vital/access/HandleResolver/1959.17/12799.
Full textAbstract:
"This dissertation illustrates an interdisciplinary sport science approach to further understand the interaction between physiology and performance in tennis. An integral theme throughout the experimental phases was the emphasis on obtaining information from actual competitive scenarios or settings that simulated a match environment. [...] This study extended the work of similar investigations through the multifaceted methods in which performance was quantified. Overall the thesis provides unique insight into the physiological demands of professional tournament tennis and the constraints these impose on performance. Furthermore, evidence was accrued to support some of the common preparatory and in-match behaviours used by players to enhance performance."Doctor of Philosophy
49
Hornery, Daniel. "A comprehensive profile of elite tennis and strategies to enhance match play performance." University of Ballarat, 2006. http://archimedes.ballarat.edu.au:8080/vital/access/HandleResolver/1959.17/14634.
Full textAbstract:
"This dissertation illustrates an interdisciplinary sport science approach to further understand the interaction between physiology and performance in tennis. An integral theme throughout the experimental phases was the emphasis on obtaining information from actual competitive scenarios or settings that simulated a match environment. [...] This study extended the work of similar investigations through the multifaceted methods in which performance was quantified. Overall the thesis provides unique insight into the physiological demands of professional tournament tennis and the constraints these impose on performance. Furthermore, evidence was accrued to support some of the common preparatory and in-match behaviours used by players to enhance performance."Doctor of Philosophy
50
Borah, Deva Kanta, and dborah@nmsu edu. "Detection and Estimation in Digital Wireless Communications." The Australian National University. Research School of Information Sciences and Engineering, 2000. http://thesis.anu.edu.au./public/adt-ANU20050506.015503.
Full textAbstract:
This thesis investigates reliable data communication techniques for wireless channels. The problem of data detection at the receiver is considered and several novel detectors and parameter estimators are presented.¶
It is shown that by using a noise-limiting prefilter, with a spectral support at least equal to the signal part of the received signal, and sampling its output at the Nyquist rate, a set of sufficient statistics for maximum likelihood sequence detection (MLSD) is obtained.¶
Observing that the time-variations of the multipaths in a wireless channel are
bandlimited, channel taps are closely approximated as polynomials in time. Using this representation, detection techniques for frequency-flat and frequency-selective channels are obtained. The proposed polynomial predictor based sequence
detector (PPSD) for frequency-flat channels is similar in structure to the MLSD that employs channel prediction. However, the PPSD uses {\em a priori} known
polynomial based predictor taps. It is observed that the PPSD, without any explicit knowledge of the channel autocovariance, performs close to the Innovations based MLSD.¶
New techniques for frequency-selective channel estimation are presented. They are based on a rectangular windowed least squares algorithm, and they employ a
polynomial model of the channel taps. A recursive form of the least squares algorithm with orthonormal polynomial basis vectors is developed. Given the appropriate window size and polynomial model order, the proposed method outperforms the conventional least mean squares (LMS) and the exponentially weighted recursive least squares (EW-RLS) algorithms. Novel algorithms are proposed to obtain near optimal window size and polynomial model order.¶
The improved channel estimation techniques developed for frequency-selective channels are incorporated into sliding window and fixed block channel estimators. The sliding window estimator uses received samples over a time window to calculate the channel taps. Every symbol period, the window is moved along another symbol period and a new estimate is calculated. A fixed block estimator uses all
received samples to estimate the channel taps throughout a data packet, all at once. In fast fading and at a high signal-to-noise ratio (SNR), both techniques
outperform the MLSD receivers which employ the LMS algorithm for channel estimation.¶
An adaptive multiuser detector, optimal in the weighted least squares (WLS) sense, is derived for direct sequence code division multiple access (DS-CDMA) systems. In a multicellular configuration, this detector jointly detects the users within the cell of interest, while suppressing the intercell interferers in a WLS sense. In the absence of intercell interferers, the detector reduces to the well-known multiuser MLSD structure that employs a bank of matched filters. The relationship between the proposed detector and a centralized decision feedback detector is derived. The effects of narrowband interference are investigated and compared with the multiuser MLSD.¶
Since in a fast time-varying channel, the LMS or the EW-RLS algorithms cannot track the channel variations effectively, the receiver structures proposed for single user communications are extended to multiuser DS-CDMA systems. The fractionally-chip-spaced channel taps of the convolution of the chip waveform with the multipath channel are estimated. Linear equalizer, decision feedback equalizer
and MLSDs are studied, and under fast fading, as the SNR increases, they are found to outperform the LMS based adaptive minimum mean squared error (MMSE) linear receivers.