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ChesterRep is the University of Chester's institutional repository and an online platform designed to collate, store, and aid discoverability of research carried out at the university to the wider research community

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  • Efficient Surrogate Model-Assisted Evolutionary Algorithm for Electromagnetic Design Automation with Applications

    Akinsolu, Mobayode, O. (University of ChesterWrexham Glyndŵr University, 2019-10)
    In this thesis, the surrogate model-aware evolutionary search (SMAS) framework is extended for efficient interactive optimisation of multiple criteria electromagnetic (EM) designs and/or devices through a novel method called two-stage interactive efficient EM micro-actuator design optimisation (TIEMO). The first robust analytical and behavioural study of the SMAS framework is also carried out in this thesis to serve as a guide for the meticulous selection of multiple differential evolution (DE) mutation strategies to make SMAS fit for use in parallel computing environments. Based on the study of SMAS and the self-adaptive use of the selected multiple DE mutation strategies and reinforcement learning techniques, a novel method, parallel surrogate model-assisted evolutionary algorithm for EM design (PSAED) is proposed. PSAED is tested extensively using mathematical benchmark problems and numerical EM design problems. For all cases, the efficiency improvement of PSAED compared to state-of-the-art evolutionary algorithms (EAs) is demonstrated by the several times up to about 20 times speed improvement observed and the high quality of design solutions. PSAED is then applied to real-world EM design problems as two purposebuilt methods for antenna design and optimisation and high-performance microelectro-mechanical systems (MEMS) design and optimisation in parallel computing environments, parallel surrogate model-assisted hybrid DE for antenna optimisation (PSADEA) and adaptive surrogate model-assisted differential evolution for MEMS optimisation (ASDEMO), respectively. For all the real-world antenna and MEMS design cases, PSAED methods obtain very satisfactory design solutions using an affordable optimisation time and comparisons are made with available alternative methods. Results from the comparisons show that PSAED methods obtain very satisfactory design solutions in all runs using an affordable optimisation time in each, whereas the alternative methods fail and/or seldom succeed to obtain feasible or satisfactory design solutions. PSAED methods also show better robustness and stability. In the future, PSAED methods will be embedded into commercial CAD/CEM tools and will be further extended for use in higher-order parallel clusters.
  • Probing NaCl hydrate formation from aqueous solutions by Terahertz Time-Domain Spectroscopy

    Yang, Bin; University of Chester
    The cooling-induced formation of hydrate in aqueous NaCl solutions was probed using terahertz time-domain spectroscopy (THz-TDS). It was found that the NaCl hydrate formation is accompanied with emergence of four new absorption peaks at 1.60, 2.43, 3.34 and 3.78 THz. Combining the X-ray diffraction measurement with the solid-state based density functional theory (DFT) calculations, we assign the observed terahertz absorption peaks to the vibrational modes of the formed NaCl⋅2H2O hydrate during cooling. This work dedicates THz-TDS based analysis great potential in studying ionic hydrate and the newly revealed collective vibrational modes could be the sensitive indicators to achieve quantitative analysis in phase transitions and lattice dynamics.
  • Sustainable leadership and its implications for the further education sector,

    Lambert, Steve; University of Hull
    The purpose of this article is to review the models of sustainable leadership which are currently available in the compulsory sector to establish whether the models are appropriate for post-compulsory education, and in particular for general further education colleges. Due to the complexities of the environment in which further education colleges operate, models of sustainable leadership have not been applied to this sector. In order to achieve this, leadership challenges for further education will be explored and the sector’s responses to these will be considered. Many of these challenges are based on government pressure for efficiency and effectiveness savings, and so will be contextualised in a new managerial framework. The article then goes on to examine current models of sustainable leadership, looking at whether they are applicable for general further education colleges. Should they not be appropriate, then a suggested model will be put forward which draws on the transferable components for existing models with additions which are appropriate to the post-compulsory sector.
  • Leading for the future

    Lambert, Steve; University of Chester
    Developing the next generation of leaders is critical to the success of further education colleges. However, this has to be more than talent development or succession planning if colleges are going to succeed in the highly complex and political environment in which they currently operate. This book looks at developing future leaders through a different lens. The book advocates for leadership development to be located within a sustainable leadership framework which encompasses a range of existing leadership theories. This enables leadership to be developed holistically from deep within an organisation and provides a framework for developing individuals who have the skills necessary to lead further education colleges.
  • Defining a tri-dimensional approach to the development of leaders of further education colleges.

    Lambert, Steve; University of Hull
    This article presents a review of current leadership practices of principals in further education colleges and suggests that principalship is more than a two-dimensional functional model comprising internal or externally focused activities. During the past 20 years further education leadership has become more demanding, with greater accountability imposed by a state-controlled system and, as Hargreaves and Fink (2005) suggest, this has impacted on the number of individuals entering senior leadership posts. In light of these changes it is appropriate to review the role of the principal and what is known about the way the role has changed. As a result of the way in which principalship has evolved, this article introduces a tri-dimensional model of principalship first by reflecting on leadership practices of college principals and identifying the key elements of their role, and second by suggesting that college principalship compasses three theoretical aspects: a public, an internal–public and an internal–private.

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