In this thesis, firstly we have reviewed both previous and current state of optical CDMA (OCDMA) technologies. Search for appropriate spreading codes is one of the main challenges of OCDMA applications and hence is an important topic which is heavily addressed in the literature.…
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It has been of major interest in recent research to produce faster optical processing for many telecommunications applications, as well as other applications of high performance optoelectronics. The combination of one-dimensional photonic crystal structures (PhC) and narrow phot…
This thesis is about the development of microelectrodes array system (MEAs), the simulation of the neuron and the recording to the living neural network. We cultured the nerve cells of rat inside a container called 'neural bathtub' and guided them to form predetermined network (…
In this thesis, monolithically integrated photonic devices for next generation optical telecommunications networks were investigated, namely semiconductor modelocked ring lasers and Mach-Zehnder interferometers operating at 1550 nm. Fabricated on the aluminium quaternary, the 2.…
This thesis describes a comprehensive, simulation based scaling study – including device design, performance characterization, and the impact of statistical variability – on deca-nanometer bulk MOSFETs. After careful calibration of fabrication processes and electrical characteri…
Systems Integration is widely accepted as the basis for improving the efficiency and performance of many engineering products. The aim is to build a unified optimised system not a collection of subsystems that are combined in some ad hoc manner. This moves traditional design bou…
The field of Autonomous Underwater Vehicles (AUVs) has increased dramatically in size and scope over the past two decades. Application areas for AUVs are numerous and varied; from deep sea exploration, to pipeline surveillance to mine clearing. However, one limiting factor with …
Electron beam lithography is capable of defining structures with sub-10 nm linewidths. To exploit this capability to produce working devices with structures defined in multiple 'lithographic steps' a process of alignment must be used. The conventional method of scanning the elec…
In recent years, the use of encoded beads has received considerable attention due to their potential for measuring multiple analytes in solution.(1-4) This can be achieved without the need for knowledge of their spatial position, as in the case of microarray technology. Encoded …
This thesis describes the design, development, construction and performance of an instrumentation system suitable for the measurement of single electron quantum dot devices. The inaugural measurement with this new system produced fascinating experimental data from a novel magnet…
This thesis is concerned with investigating the use of Gaussian Process (GP) models for the identification of nonlinear dynamic systems. The Gaussian Process model is a non-parametric approach to system identification where the model of the underlying system is to be identified …
High Electron Mobility Transistors (HEMTs) are crucially important devices in microwave circuit applications. As the technology has matured, new applications have arisen, particularly at millimetre-wave and sub-millimetre wave frequencies. There now exists great demand for low-v…
Multilevel converters have attracted a great deal of interest in recent years since they offer a number of advantages in many high voltage and high power applications, such as adjustable speed electric motor drives and power systems through Flexible Alternating Current Transmiss…
In this thesis, current work carried out on analyzing the strategic behaviours in electricity trading is first reviewed. An intelligent decision-making and support technique, game theory, is often used in the market practice. Game theory is a discipline concerned with how indivi…
Modern railways are required to operate with a high level of safety and reliability. The weakest components are those which have the highest safety requirements and the lowest inherent reliability. Single-throw mechanical actuators, such as powered train doors, trainstops, level…
This study investigates the Internet's resilience to instabilities caused by the mismatch of its topological state and routing information. A first numerical analysis proves that the Internet possesses unused path diversity which could be employed to strengthen its resilience to…
Due to its increasing applications in personal communications systems, body-centric wireless communications has become a major field of interest for researchers. Fading and interference are the two concerns that affect the reliability and quality of service of wireless links. Di…
Testing of digital VLSI circuits entails many challenges as a consequence of rapid growth of semiconductor manufacturing technology and the unprecedented levels of design complexity and the gigahertz range of operating frequencies. These challenges include keeping the average an…
The thesis presents study to explore the role of dynamic features in speaker verification. Based on the theory that dynamic information should contain important speaker information, modelling the dynamics should have the potential to improve the speaker verification performance.…