A 10:1 Bandwidth Cryogenic Quadruple-Ridged Flared Horn Design for Reflector Antennas in Radio Astronomy
Journal Article
Ma, Y., See, C. H., Pang, F., Wu, D., Liu, D., Abidin, Z. Z., …Abd-Alhameed, R. A. (2020)
A 10:1 Bandwidth Cryogenic Quadruple-Ridged Flared Horn Design for Reflector Antennas in Radio Astronomy. IEEE Access, 8, 81101-81115. https://doi.org/10.1109/ACCESS.2020.2991350
A two port 2.4 to 24 GHz cryogenic Quadruple-Ridged Flared Horn (QRFH) Feed with 10:1 impedance bandwidth is selected for presentation and investigation in this paper. The an...
Modelling IoT devices communication employing representative operation modes to reveal traffic generation characteristics
Journal Article
Barakat, B., Keates, S., Wassell, I. J., & Arshad, K. (2021)
Modelling IoT devices communication employing representative operation modes to reveal traffic generation characteristics. International Journal of Parallel, Emergent and Distributed Systems, 36(2), 117-129. https://doi.org/10.1080/17445760.2019.1649402
Several traffic models for the Internet of Things (IoT) have been proposed in the literature. However, they can be considered as heuristic models since they only reflect the s...
Is the Zero-Wait Policy Always Optimum for Information Freshness (Peak Age) or Throughput?
Journal Article
Barakat, B., Keates, S., Wassell, I., & Arshad, K. (2019)
Is the Zero-Wait Policy Always Optimum for Information Freshness (Peak Age) or Throughput?. IEEE Communications Letters, 23(6), 987-990. https://doi.org/10.1109/LCOMM.2019.2907935
The Zero-Wait (ZW) policy is widely held to achieve maximum information 'freshness', i.e., to achieve minimum Peak Age (PA) and maximum throughput, for real-time Internet-of-T...
When Universal Access is not quite universal enough: Case studies and lessons to be learned
Journal Article
Keates, S. (2020)
When Universal Access is not quite universal enough: Case studies and lessons to be learned. Universal Access in the Information Society, 19, 133-144. https://doi.org/10.1007/s10209-018-0636-2
While the theory of designing for Universal Access is increasingly understood, there remain persistent issues over realising products and systems that meet the goal of being a...
Simultaneous Bayesian Clustering and Feature Selection Through Student’s ${t}$ Mixtures Model
Journal Article
Sun, J., Zhou, A., Keates, S., & Liao, S. (2018)
Simultaneous Bayesian Clustering and Feature Selection Through Student’s ${t}$ Mixtures Model. IEEE Transactions on Neural Networks and Learning Systems, 29(4), 1187-1199. https://doi.org/10.1109/tnnls.2016.2619061
In this paper, we proposed a generative model for feature selection under the unsupervised learning context. The model assumes that data are independently and identically samp...
Measuring acceptable input: What is "good enough"?
Journal Article
Keates, S. (2017)
Measuring acceptable input: What is "good enough"?. Universal Access in the Information Society, 16(3), 713-723. https://doi.org/10.1007/s10209-016-0498-4
Many new assistive input systems developed to meet the needs of users with functional impairments fail to make it out of the research laboratory and into regular use by the in...
A pedagogical example of teaching Universal Access
Journal Article
Keates, S. (2015)
A pedagogical example of teaching Universal Access. Universal Access in the Information Society, 14(1), 97-110. https://doi.org/10.1007/s10209-014-0398-4
Designing for Universal Access requires designers to have a good understanding of the full range of users and their capabilities, appropriate datasets, and the most suitable t...
Subdivision surface fitting to a dense mesh using ridges and umbilics
Journal Article
Ma, X., Keates, S., Jiang, Y., & Kosinka, J. (2015)
Subdivision surface fitting to a dense mesh using ridges and umbilics. Computer Aided Geometric Design, 32, 5-21. https://doi.org/10.1016/j.cagd.2014.10.001
Fitting a sparse surface to approximate vast dense data is of interest for many applications: reverse engineering, recognition and compression, etc. The present work provides ...
Canonical correlation analysis on data with censoring and error information
Journal Article
Sun, J., & Keates, S. (2013)
Canonical correlation analysis on data with censoring and error information. IEEE Transactions on Neural Networks and Learning Systems, 24(12), 1909-1919. https://doi.org/10.1109/TNNLS.2013.2262949
We developed a probabilistic model for canonical correlation analysis in the case when the associated datasets are incomplete. This case can arise where data entries either co...
Designing user interfaces for "ordinary users in extraordinary circumstances": a keyboard-only web-based application for use in airports
Journal Article
Keates, S. (2013)
Designing user interfaces for "ordinary users in extraordinary circumstances": a keyboard-only web-based application for use in airports. Universal Access in the Information Society, 12(2), 205-216. https://doi.org/10.1007/s10209-012-0276-x
Universal Access is commonly interpreted as focusing on designing for users with atypical requirements—specifically users with disabilities or older adults. However, Universal...