Welcome to UDORA, the University of Derby Online Research Archive.

UDORA is the institutional repository of research produced by staff at the University of Derby, and an archive of our completed doctoral theses.

If you are a member of staff ready to submit your research, please see our Quick Guide to Getting Started.

We welcome any feedback. Please contact UDORA@derby.ac.uk

 

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  • An active deep learning approach for minimally supervised polsar image classification

    Xue, Yong; Limbert, Holly; University of Derby; Fudan University, Shanghai, China; X'ian Electronics and Engineering Institute, China (IEEE, 2019-08-01)
    Recently, deep neural networks have received intense interests in polarimetric synthetic aperture radar (PolSAR) image classification. However, its success is subject to the availability of large amounts of annotated data which require great efforts of experienced human annotators. Aiming at improving the classification performance with greatly reduced annotation cost, this paper presents an active deep learning approach for minimally supervised PolSAR image classification, which integrates active learning and fine-tuned convolutional neural network (CNN) into a principled framework. Starting from a CNN trained using a very limited number of labeled pixels, we iteratively and actively select the most informative candidates for annotation, and incrementally fine-tune the CNN by incorporating the newly annotated pixels. Moreover, to boost the performance and robustness of the proposed method, we employ Markov random field (MRF) to enforce class label smoothness, and data augmentation technique to enlarge the training set. We conducted extensive experiments on four real benchmark PolSAR images, and experiments demonstrated that our approach achieved state-of-the-art classification results with significantly reduced annotation cost.
  • Retrospective analysis of plagiaristic practices within a cinematic industry in india – a tip in the ocean of icebergs

    Sivasubramaniam, Shiva D; Paneerselvam, Umamaheswaran; Ramachandran, Sharavan; News7-Tamil Tamil Television; Health Sciences Centre, University of Texas (Springer, 2020-01-24)
    Music plagiarism is defined as using tune, or melody that would closely imitate with another author’s music without proper attributions. It may occur either by stealing a musical idea (a melody or motif) or sampling (a portion of one sound, or tune is copied into a different song). Unlike the traditional music, the Indian cinematic music is extremely popular amongst the public. Since the expectations of the public for songs that are enjoyable are high, many music directors are seeking elsewhere to “borrow” tunes. Whilst a vast majority of Indian cinemagoers may not have noticed these plagiarised tunes, some journalists and vigilant music lovers have noticed these activities. This study has taken the initiative to investigate the extent of plagiaristic activities within one Indian cinematic music industry. A list of plagiarised songs was produced by using YouTube® searches for “comparative videos” made by the vigilant music lovers about accused/detected music plagiarism. Some of these individuals were also interviewed to understand their views on this. During the investigation, it was possible to identify a vast number of plagiarised tunes, snippets, or even the full songs. In fact, some of these examples’ dates to 1954, during the era when no one would have noticed plagiarism. The paper would highlight the similarities of these music files. It will also show some examples of the excuses/denial given by the composers and would try to highlight the attitudes of general public towards these types of activities.
  • National guidelines and your continuing professional development

    Bryson, David; University of Derby (Taylor & Francis, 2020-01-23)
    There are several links between the national guidelines produced by the Institute of Medical Illustrators (IMI), the development of evidence-based practice and continuing professional development (CPD). This includes their development, research and testing in practice, their use either to support the development of best practice or their direct implementation. This paper suggests a number of ways to engage with the guidelines to support your professional learning and CPD.
  • Descriptive framework for simulation-aided sustainability decision-making: a delphi study

    Gbededo, Mijoh A; Liyanage, Kapila; University of Derby; University of Strathclyde (Elsevier, 2020-02-13)
    Making an effective sustainability decision at every stage of a product life cycle is key to achieving a holistic sustainable product development. The extant literature highlights the challenges and lack of effective tools for determining the impact of manufacturing processes on the environmental, economic and social dimensions, as well as the interdependence of the outcome of one dimension on the other. This research paper identifies methodologies, tools, and approaches that can be integrated into a single descriptive framework to enable both assessment and analysis of the aspects of the three sustainability dimensions. The paper also details the development of the framework using inductive methods and conceptual synthesis of key sustainability approaches and a Delphi study involving panels of international researchers and practitioners in the field of sustainable manufacturing. The framework can provide a platform for both practitioners and sustainability analysts to build impact analysis models that will support effective sustainability decision-making. It will also enable a clear perspective of the required elements, processes and indicators that need to be considered in sustainable manufacturing design and assessments.
  • A dinuclear ruthenium(II) complex excited by near-infrared light through two-photon absorption induces phototoxicity deep within hypoxic regions of melanoma cancer spheroids

    Raza, Ahtasham; Archer, Stuart A; Fairbanks, Simon D; Smitten, Kirsty L.; Botchway, Stanley W.; Thomas, Jim A; MacNeil, Sheila; Haycock, John W.; The University of Derby (American Chemical Society (ACS), 2020-02-17)
    The dinuclear photo-oxidizing RuII complex [{Ru(TAP2)}2(tpphz)]4+ (TAP = 1,4,5,8- tetraazaphenanthrene, tpphz = tetrapyrido[3,2-a:2′,3′-c:3′′,2′′- h:2′′′,3′′′-j]phenazine), 14+ is readily taken up by live cells localizing in mitochondria and nuclei. In this study, the two-photon absorption cross-section of 14+ is quantified and its use as a two-photon absorbing phototherapeutic is reported. It was confirmed that the complex is readily photo-excited using near infrared, NIR, light through two-photon absorption, TPA. In 2-D cell cultures, irradiation with NIR light at low power results in precisely focused photo-toxicity effects in which human melanoma cells were killed after 5 minutes of light exposure. Similar experiments were then carried out in human cancer spheroids that provide a realistic tumor model for the development of therapeutics and phototherapeutics. Using the characteristic emission of the complex as a probe, its uptake into 280 µm spheroids was investigated and confirmed that the spheroid takes up the complex. Notably TPA excitation results in more intense luminescence being observed throughout the depth of the spheroids, although emission intensity still drops off toward the necrotic core. As 14+ can directly photo-oxidize DNA without the mediation of singlet oxygen or other reactive oxygen species, photo-toxicity within the deeper, hypoxic layers of the spheroids was also investigated. To quantify the penetration of these phototoxic effects, 14+ was photo-excited through TPA at a power of 60 mW, which was progressively focused in 10 µm steps throughout the entire z-axis of individual spheroids. These experiments revealed that, in irradiated spheroids treated with 14+, acute and rapid photo-induced cell death was observed throughout their depth, including the hypoxic region.

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