Dr Sillas Hadjiloucas
- +44 (0) 118 378 6787
Systems Engineering, Rm 180
Areas of Interest
I was appointed Lecturer in Cybernetics in January 2000. My appointment follows two previous appointments as an EC TMR (Training and Mobility of Researchers) Post-Doctoral Research Fellow working on Terahertz Instrumentation as part of the INTERACT (International Terahertz Action) project in UK and Germany. My work aims to enhance the existing equipment infrastructure at Reading and develop novel on-line and off-line signal processing modalities. Work so far has concentrated in developing a range of sensing techniques across the electromagnetic spectrum and a range of novel signal processing algorithms. Most of the work has important applications in the biomedical field. Prior to completion of my PhD (1996) at the Department of Cybernetics, I obtained BSc and MPhil degrees from the Department of Pure and Applied Biology at the University of Leeds. I have considerable experience in cross-disciplinary research across all natural Sciences.
I currently teach the SE2SP11 Laplace and Fourier Theory module, the CY2J9 module in Sensors and Devices for Robotics Measurement Applications and the CY2B9 Electronics module. I also co-supervise the 'Flying Brains' group project (SE3GP11). Previously I used to teach Biological Systems (Part 2), Animal Feedback Systems (Part 3) and Biomedical Instrumentation (Part 4) modules, which were developed as new courses. My multi-disciplinary research interests are reflected in all the courses I teach. Lecture notes are enhanced with additional information from well selected research papers. I rely on alternative teaching styles, trying to foster reasoning from first principles whenever possible.
Current Administrative duties
Since 2006, I have been organising the School research seminars, (more than 100 seminars organized so far). Since 2011, I am the Admissions Tutor in Systems Engineering for Electrical Engineering and Cybernetics programmes.
Research in instrumentation and measurement
Development of novel amplitude modulated reflectance fibre-optic displacement sensors and novel feedback based optoelectronic stabilization schemes for accurately measuring displacement, velocity, acceleration, force and pressure. These are suitable for a range of automotive and robotic applications, and have been also used for flow measurement and the measurement of relative humidity in the atmosphere (through the development of a feedback dew-point sensor).
Development of optical force feedback microphones (this is a continuation of work performed by L. Karatzas, D. Keating and M. Usher). The innovation in the work lies in the use of force feedback to control the motion of the diaphragm in the capsule, with the sensing performed interferometrically. By measuring the amount of effort needed to keep the capsule in a set position in the presence of a disturbance (staying at the mid-point of a single fringe in a Fabry-Perot interference pattern), a very accurate (shot noise limited) estimate of the acoustic disturbance is obtained. The work required the design of a novel capsule topology that linearizes the feedback system. Applications include non-destructive testing, biomedical applications, audio research, echo-location and photoacoustic spectrometry.
Collaboration with the Department of Electronic and Electrical Engineering (Optoelectronics Division, headed by Prof. B.Culshaw) and the Department of Pure and Applied Chemistry, the University of Strathclyde led to work towards the development of a hydrogel (hydrophilic polymer) based distributed fibre optic microbend sensor for measuring of soil moisture and the water potential (a component of the chemical potential) in solutions. This sensor was based on measurements of quasi-sinusoidal distortions of fixed periodicity on a multimode graded index optical fibre using Optical Time Domain Reflectometry.
Much of the sensing work in millimetre and sub-millimetre wave techniques and Terahertz (THz) sensing started during my PhD in 1995 and has always been performed in collaboration with J. Bowen. The work started with the use of a terahertz null-balance transmissometer (a hybrid between a Mach-Zehnder and a Martin-Puplett polarising interferometer) for continuous in situ measurements of leaf relative water content. During my post-doctoral research fellowships, additional experience was gained in the use of a wide range of THz sources such as Impatt diodes, klystrons, backward wave oscillators and optically pumped far-infrared lasers, as well as room temperature and cryogenically cooled detectors. We used a dispersive Fourier Transform Spectrometer in transmission and reflection configurations to measure the complex refractive index of a range of materials at THz frequencies. Small refinements to this well established experimental technique have been made to account for reflection measurements of extremely thin samples as well as to account for the diffractive spreading of the beam during transmission measurements. The dispersive Fourier Transform Spectrometer has also been used for characteristic impedance measurements. There has been work in the characterisation of micro-machined passive millimetre and sub-millimetre wave components, measuring E-plane and H-plane antenna patterns at 140-200 GHz and 1.6 THz for micro-fabricated devices produced by Bath, Nottingham and Leeds Universities as part of the EPSRC-funded TINTIN (Terahertz Integrated Technology Initiative) program. This is important for optimizing the coupling between free space propagating EM waves and waveguide structures. Using Jones calculus, an error analysis has been developed for quasi-optical null balance bridge circuits commonly used for transmission and reflection coefficient measurements in the frequency range 100 GHz to 1 THz. This is of relevance to de-embedding waveguide impedance and attenuation as well as for the estimation of the impedance mismatch encountered in antenna structures mounted on substrates. As visiting researcher at the Department of Electrical and Electronic Engineering, The University of Leeds I performed high-frequency (75-110 GHz) in-waveguide and free-space measurements on a WR-10 Waveguide precision short with an 8510 HP vector network analyser. The results were compared with quasi-optical null-balance reflectometer measurements after using the new de-embedding technique which was developed at Reading for validation. A theoretical treatment that accounts for errors in the measured propagation constant due to imperfect coupling of two fundamental Gaussian beams in a quasi-optical reflectometer has been developed.
Through my employment by the Space Sensor Technology and Planetary Exploration Group in DLR Berlin as an EC TMR Post-Doctoral Research Fellow in the INTERACT project, I was responsible for the further development of a frequency and amplitude stabilisation scheme of a new type (rf excited) CO2 laser from DEOS (DeMaria Electro-optics, USA). Stabilisation was achieved by frequency locking the laser output to a confocal Fabry-Perot cavity which was also locked to the wavelength of a Zeeman stabilised He-Ne laser. The stabilised CO2 laser is to be used to either optically pump a far-infrared laser which served as local oscillator (operating at discrete frequencies between 1 and 5.2 THz) for an NbN hot electron bolometer mixer aboard SOFIA (the Stratospheric Observatory for Infrared Astronomy, a jointly funded project between NASA and DLR), or as a coherent source that in conjunction with a transversely excited far infra-red cavity, formed part of a laser magnetic resonance spectrometer to be used aboard an aircraft for the detection of free radicals in the lower stratosphere and upper troposphere. The laboratories in Berlin have state-of-the-art facilities for the development of solid-state THz sources (p-Ge and Si lasers) and detectors covering the whole frequency range 1-6 THz (Ge:Ga, InSb, GaAs, Si-Bolometer) as well as complete characterisation facilities for superconductor-insulator-superconductor tunnelling junction heterodyne receivers, and hot-electron bolometer mixers (HEBs) which are used for high-resolution heterodyne spectroscopy. As member of the Berlin group, I observed the lowest ever noise temperatures in heterodyne receivers using devices developed in Chalmers (Sweden) surpassing the world record previously held by the Jet Propulsion Laboratories Group in Pasadena USA. The HEB devices developed at Moscow Pedagogical University (Russian Academy of Sciences) and characterised in Berlin may be used aboard SOFIA. As part of the Reading-DLR collaboration I used a novel quasi-optical interferometric technique (which was originally developed by Dr. Bowen at Reading) for measuring antenna phase patterns without the need of a heterodyne receiver. The technique is particularly suited for the characterisation of terahertz antennas feeding power detectors or mixers employing quasi-optical local oscillator injection. Work in Berlin concentrated in adopting this technique for further characterisation of whisker contacted Schottky barrier diode mixers mounted on cube corner reflectors as well as for further characterisation of HEBs. Provided that the technique proves sufficiently user-friendly at frequencies up to 2.5 THz, it may be adopted for the characterisation of the quasi-optical circuits aboard FIRST, a satellite built by ESA.
I worked as visiting researcher at RWTH Aachen with the fast-pulse (femtosecond) THz spectroscopy group (currently considered as one of the best group in the world in THz spectroscopy) and characterised polymers and waveguide structures at frequencies ranging from 100 GHz to 3.0 THz. This work led to a collaboration with GigaOptics GmbH, Mhlheim/Main Germany for the development of a novel dual frequency comb THz spectrometer, this is now known in the fast pulse community as the ASOPS modality. My knowledge of optics, femtosecond systems and the related research disciplines has led to my appointment to the position of 'Ultrafast Laser Lab committee member for the University until its re-deployment at Imperial College.
Research in signal processing, system identification and control
The research activities in Instrumentation and Measurement are further supported by advanced Signal Processing modalities and an innovative Chemometric framework. This work is performed in collaboration with R.K.H. Galvao of ITA, Brazil. Much of the work has focused on the signal processing (de-noising) of signals generated from THz transient spectrometers. Filtering by hard or soft thresholding is performed after transforming the signal in the Fourier, Windowed Fourier, Principal Component (PC) or wavelet domains. We have also developed a range of useful algorithms to de-embed the complex propagation constant from multi-modal excitation of micro-machined waveguides (useful for micro-spectroscopy applications where the waveguide is filled with small volumes of the dielectric to be characterised). This is achieved by adopting algorithms found in the Systems Identification literature (ARX, and N4SID subspace models for linear spectroscopy and NARX models to account for the non-linear cut-on of waveguide modes). Since a femtosecond duration pulse is capable of persistent excitation of the medium within which it propagates, all the resonances in the medium can be identified. The multimode Brownian oscillator time-domain response function represented in state-space form is a mathematically robust framework that can be used to describe the dispersive phenomena governed by Lorentzian, Debye and Drude responses. The optical properties of an arbitrary medium can be expressed as a linear combination of simple multimode Brownian oscillator functions. These algorithms are now extended to the domain of fractional order calculus (where the system dynamics are more faithfully modelled using differential equations of non-integral order). This extension should allow us to understand processes observed in broadband dielectric spectroscopy experiments of heterogeneous materials such as glasses, ceramics, amorphous semiconductors, heavily doped crystals, polymers, and composites excited at microwave, far-infrared, visible and UV frequencies which do not exhibit clear resonances and display Jonscher-like responses. The work is based on the development of a theoretical framework which utilizes descriptor representations and state space models of random RC networks. Additional routines developed include wavelet filtering of THz transients (using conventional mother wavelets and adaptive structures at each decomposition level), classification schemes in the PC domain and novel apodization structures which are needed because the time-domain background and sample interferograms are non-symmetrical. These algorithms have useful de-noising properties and can lead to a more precise estimation of the complex insertion loss function. Most of these algorithms are also applicable to a range of measurement modalities performed in the optical and infrared parts of the spectrum.
Under development are novel system identification tools in the wavelet domain for the further processing of spectroscopic transients. Defining the background and sample interferograms as the input and output signals, the frequency response of an identified model provides an estimate of the complex insertion loss (CIL). A wavelet-packet formulation is adopted and sub-band models Mi,j(z) are identified from the sample and background interferograms by following a least-squares procedure.
The wavelet-packet model structure consists of a decomposition tree, which defines frequency sub-bands. H(z), G(z) denote low-pass and high-pass decomposition filters, respectively, with reconstruction counterparts represented by Hr(z), Gr(z). The sub-band models are represented by the transfer functions M0,2(z), M1,2(z), M2,2(z), M3,2(z).
Model identification of a sample interferogram for a given frequency sub-band.
The signal processing work has also been extended to Wiener-Hammerstein systems to provide an identification window related to receiver motion dynamics using information from the non-linear addition of electric field amplitudes associated with multiple propagation channels (direct line-of-sight, ground/wall reflections, diffractive components) from multiple emitters. This is of interest from a mobile communications perspective. We have also performed analysis and classification of ECG signals using Linear Discriminant Analysis Classifiers as well as non-linear neural network based classifiers. A novelty in the work is the representation of the input signals to the classifiers in compact support wavelet bases. Wavelets are used to de-noise the signal and minimize the number of inputs to the neural network. The approach facilitates network training and provides a better framework for feature extraction. Furthermore, the generalization ability of the classifier is improved.
The work in Control theory (performed in collaboration with V. Becerra) concentrates on the development of a robust control theory framework for the analysis of biochemical processes encountered in cellular networks (e.g., the apoptotic process). Using mass action kinetics, a state space representation of the system dynamics is made. The network is then decomposed into several subsystems, each one associated with linear and non-linear processes. Well established tools from linear control theory such as Mu-synthesis and the D-K iteration are adopted to perform sensitivity analysis in the linear subsystems. Loop shaping design procedures (LSDP), co-prime factorization and the method of inequalities are adopted for controller design. Control is theoretically possible by adding new compounds antagonizing existing reactions, this may become possible in the future through advances in Synthetic Biology. The purpose of the simulations is to identify the sensitivity points of the system (rate sensitivities) and then postulate target sites where the Biologists should concentrate their efforts to maintain the optimal conditions that would keep a cell at a preferred state. We use a genetic algorithms multi-objective optimization (MOGA) framework for designing controllers of arbitrary order that fulfil simultaneously desirable time and frequency domain criteria in a robust manner. These algorithms represent extensions of common H-infinity analysis and synthesis approaches. A non-linear control framework based on the state-dependent Riccati equation (SDRE) is currently developed extending the linear framework. This work is of fundamental importance to Systems Biology and of relevance to Metabolic Control Analysis in general. The developed control framework has also important applications in Metrology (optimal controller design for electrical feedback substitution schemes).
Research in genetic algorithms for femtosecond pulse shaping experiments
Another line of work at Reading involves the development of a series of evolutionary meta-algorithms in MATLAB, running within the LabVIEW environment to perform pulse shaping of femtosecond duration laser pulses. Proof of principle experiments were performed where the signal from a LabVIEW controlled function generator was sent to an RF-excited acousto-optic modulator crystal which controls the spectral content and time domain characteristics of 120 femtosecond duration pulses generated from an optically pumped Ti:sapphire Kerr lens mode-locked laser oscillator. The pulses have a useful Fourier transform limited bandwidth of 50-80 nm around a centre frequency of 800 nm. The genetic algorithm (GA) population in the developed software consists of a collection of waveforms, each made from two concatenated vectors, one specifying phases over a range of frequencies and the other specifying corresponding magnitudes. Amplitude and phase genes are used to search the evolutionary landscape for desired pulse shapes with specific characteristics. With appropriate pulse shaping schemes realised in pump-probe experiments, it should in principle allow us to control bulk relaxation processes at picosecond timescales.
Selecting a breeding subset from the N best fit members (amplitudes and phases) is a very greedy heuristic that often leads to convergence around local optima instead of the global solution. One attempt to circumvent this problem is to use a probabilistic selection of breeding candidates. For instance, with roulette wheel selection (RWS), each member of the population is assigned a slice with an area proportional to fitness. Then, using the proportional probabilities from the roulette wheel, one or two candidates are selected out of the entire population and passed to the operators for production of children. The process is repeated again and again until the desired number of children are created. Because members are never removed from the roulette wheel, members with high fitness are virile and, consequently, they are chosen as parents more frequently than those with low fitness. The process can easily be coded into the algorithm by firstly creating a vector F of corresponding fitnesses for the population and then creating a cumulative summed vector for each of all indices in F. As the population starts to converge to a solution, the average fitness of the population will also start to converge to the best fitness. In RWS, the slice size for each population member will be roughly the same size, leaving little differentiation between worst and best fit members. This in turn has a detrimental effect on the selection process, and slows down the convergence of the algorithm considerably. To keep the selection pressure high, we employ fitness scaling and use the scaled fitnesses in RWS instead. After measuring and then linearly scaling the fitness, an operator is selected by RWS from a vector of operator weights. Depending on the operator chosen, either one or two parents are selected and then passed on to the operator, thereby creating the child. Current work concentrates in developing a differential evolution scheme and operators in the wavelet domain to perform high resolution waveform matching with a much higher convergence rate. An important applications of the algorithms is in the control of chemical reactions. The light pulses can be used to catalyse a reaction. Other interesting applications include Opto-Genetics (where the light pulses will trigger/silence the expression of specific genes).
Research skills map
A summary of research skills mapped to a range of application areas is provided below.
Current research projects
- Co-investigator in an International (4 year) project funded by FAPESP (Brazilian Government) Grant Title: PROJETO TEMTICO Espectroscopia Terahertz no Domnio do Tempo: Desenvolvimento de Mtodos Analticos, Tcnicas de Processamento de Sinais, Estudos Bioqumicos e Fundamentais, Coordenador: Celio Pasquini, Instituto de Qumica Universidade Estadual de Campinas, UNICAMP and Instituto Tecnolgico de Aeronutica, So Jos dos Campos (ITA), Brazil.
Past project support and donations in kind
- EPSRC GR/R36213/01 award for 'Cavity Ringdown Far-Infrared Absorption Spectroscopy' Individual Grant Review Overall Assessment:'Good' Communication of Research Outputs 'Tending to Outstanding' (PI).
- EPSRC CASE AWARD 'Future terahertz mesh network architectures for mobile telecommunications' (project co-sponsored by VODAFONE (PI).
- CCLRC AWARD 'Heterodyne cavity ringdown absorption spectroscopy for atmospheric chemistry studies at THz frequencies,' (PI).
- HEFCE funded: 'Establishment of the Ultrafast Laser Laboratory at Reading University' (with John Bowen in Cybernetics, Dr. L,. Frasinski and Dr. S. O'Leary in Physics), (Co-I).
- GREEK GOVERNMENT: PhD studentship on 'Terahertz measurement techniques for plant water relations' (PI).
- NATIONAL INSTRUMENTS donation in kind: Hardware and LABVIEW software from National Instruments towards the 'Flying Brains' student project (PI).
- MAX-PLANCK Institute for Biochemistry, Munich (Prof. Keilmann) donation in kind: a custom-made close cycle temperature control incubator which is integrated with microwave components to perform in vivo studies of the biological effects of THz radiation on yeast cell cultures (PI).
- UoR, Department of Physics donations in kind: A laser (Nd:YAG, 1 Joule 10 ns pulse), with harmonic generator crystal, polarization optics and dedicated heat exchanger, an Argon ion laser (14W) with close cycle heat exchanger, an ultrasonic scanner for biomedical applications and various optoelectronic and microwave (10 GHz) equipment and lasers (PI).
- UoR RETF three year PhD Studentship for 'Biological Investigations Using Terahertz Radiation' (PI).
- Travel and subsistence visiting Scholarships in 2006 and 2010 to Instituto Tecnolgico de Aeronutica, So Jos dos Campos Brazil for projects titled 'Control of Dynamic systems' sponsored by PRONEX/CNPq (Brazilian government) and 'Spectro-analytical Instrumentation and Methodologies' sponsored by PROCAP/CAPES (Brazilian government), (PI for UK).
- Travel and subsistence funds for Xiaoxia (Sunny) Yin to visit Reading University as Pysden Memorial Fellow to conduct research in the summer term of 2007. Collaboration with Prof. Abbott's group (Department of Electrical and Electronic Engineering, University of Adelaide) in the area of signal processing of THz transients.
- Travel and subsistence grant from RIKEN Institute to Japan for collaborations on 'Investigations on the effects of non-thermal levels of terahertz radiation in yeast cells'.
- INTAS travel and subsistence grant for collaboration with Russian Academy of Sciences, Nizhny Novgorod, Russia on 'Prospects for Cavity Ringdown Spectroscopy at THz frequencies'.
- Collaborative agreement with GigaOptics GmbH, Mhlheim/Main Germany for the development of a novel dual frequency comb THz spectrometer based around two Ti:Sapphire oscillators producing 30 femtosecond duration pulses and operated at 1 GHz repetition rate. Prototype delivered at cost price.
Current PhD students
- Mr. Mirsha Trujillo on 'Identifying feedback substitution schemes in biological systems,' PhD studentship from Mexico.
- Mr. Alyami Hashem, on 'A systems theoretic approach to the modelling of network systems' PhD studentship from Saudi Arabia.
Previous PhD students
- Dr. Abdurrahman Izhac, (Graduated December 2006), EPSRC CASE Award in collaboration with VODAFONE on 'Future terahertz mesh network architectures for mobile telecommunications'. Since December 2005, working at HTSE Technical Services Enterprise, an HSBC telecoms subsidiary.
- Dr. Major Chahal, (Graduated Summer 2008), on 'Investigations on 'the effects of non-thermal levels of terahertz radiation in yeast cells'. Employed by European Space Agency - ESA/ SRON/ESTEC, Space Research Organisation of the Netherlands Groningen, from April 2006 to winter 2009.
- Dr. Apostolos Zafiropoulos (Graduated Summer 2009) on 'Terahertz measurement techniques for plant water relations' Currently Lecturer at Technological Education Institute of Larissa, School of Agricultural Technology, Dept. of Agricultural Machinery, Larissa, Greece.
Knowledge Transfer and outreach activities
- Elected to serve on the EPSRC Peer Review College from 2003-05, re-elected in 2010. Referee for several other international funding bodies (EU, US).
- Elected to serve as Hon. Secretary and Treasurer of the Instrument Science and Technology (ISAT) Group of the Institute of Physics (IoP). Member of the Dielectrics Group Committee of the IoP, Hon. Member of the Institute of Measurement and Control (London Section).
- Member of the organizing committee for several National and International conferences: Chair of the 2013 IoP Dielectrics Conference at Reading, member of the organizing committee for the IoP 'Dielectrics' Conference in Kent April 2011, the IoP (ISAT) conferences on Sensors and Their Application (S&A) XV,' Heriot-Watt University, Edinburgh UK, October 2009, S&A XVI' Cork Ireland, September 2011, S&A XVII' Dubrovnik, Croatia, 2013, also for Drop Reaction and Microfluidic analysis (DRAMA) 11-13 September 2012, organized by the Royal Dublin Society, Ireland, member of the local organising committee for the 'IEEE SMC UK & RI,' 9th Conference on Cybernetic Intelligent Systems 2010 (Systems Man & Cybernetics), University of Reading, September 2010. For the past 4 years, co-organized the annual THz meetings of the IoP.
- Journal referee for more than 40 different IEEE, IoP, IET, OSA, RSoC, Springer, Elsevier, Taylor & Francis, Wiley Journals.
- Member of Editorial Boards: IFSA Sensors & Transducers Journal and 'Recent Patents on Signal Processing', (Bentham Open Publishers).
- Regular engagement in knowledge transfer (participated in some 100 conferences & meetings of the IoP, IET, InstMC, OSA, EOS and IEEE).
- Visiting Professor status from Universidade Estadual De Campinas, Instituto de Quimica UNICAMP, Brazil, (arguably the most famous research-led institution in Latin America) in September 2010. Also, visiting researcher at Instituto Tecnolgico de Aeronutica, So Jos dos Campos Brazil.
- Participation in several EPSRC Basic Technology open days.
- Received training by EPSRC for outreach activities ('Meet the Scientist' Programme).
- Given one of the 2010 'Frontier Science Lectures' at Reading University.
- Participation in UoR open day activities related to Instrumentation and Measurement.
- Member of Connect, a Technology Strategy Board Professional Networking Service since July 2010. Member of Electronics, Sensors, Photonics, Energy Generation and Supply, Environmental Sustainability, FP7UK, HealthTech and Medicines Knowledge transfer Networks.
- Co-authored journal and conference papers with academics within the UK: Leeds, Strathclyde, Durham, Nottingham, Bath, and Sussex Universities as well as the National Physical Laboratory (NPL), Time and Frequency Metrology Division.
- Abroad: DLR German Aerospace Center Berlin-Adlesrshof, Rheinisch-Westflische Technische Hochschule Aachen (RWTH) Germany, Georgia Institute of Technology USA, Stevens Institute of Technology USA, Instituto Tecnolgico de Aeronutica, So Jos dos Campos Brazil, Departmento de Cincia da Computao Universidade Catlica de Gois, Goinia Brazil, Electrical and Electronic Engineering Department Adelaide University.
Research groups / Centres
- Galvão, R. K. H., Kienitz, K. H. and Hadjiloucas, S. (2018) Conversion of descriptor representations to state-space form: an extension of the shuffle algorithm. International Journal of Control, 91 (10). pp. 2199-2213. ISSN 0020-7179 doi: https://doi.org/10.1080/00207179.2017.1336671
- Lupupa, M. and Hadjiloucas, S. (2018) Fractional-order system identification in massive MIMO systems. Journal of Physics: Conference Series, 1065. 212016. ISSN 1742-6588 doi: https://doi.org/10.1088/1742-6596/1065/21/212016
- Jannah, N. and Hadjiloucas, S. (2017) A comparison between ECG beat classifiers using multiclass SVM and SIMCA with time domain PCA feature reduction. In: 2017 UKSim-AMSS 19th International Conference on Modelling & Simulation, 5-7 April 2017, Cambridge University (Emmanuel College), pp. 126-131.
- Galvão, R. K. H., Matsuura, J. P., Colombo Jr., J. R. and Hadjiloucas, S. (2017) Detecting compositional changes in dielectric materials simulated by three-dimensional RC network models. IEEE Transactions on Dielectrics and Electrical Insulation, 24 (2). pp. 1141-1152. ISSN 1070-9878 doi: https://doi.org/10.1109/TDEI.2017.006203
- Yin, X. -X., Hadjiloucas, S., Chen, J. -H., Zhang, Y., Wu, J. -L. and Su, M. -Y. (2017) Tensor based multichannel reconstruction for breast tumours identification from DCE-MRIs. PLoS ONE, 12 (3). e0172111. ISSN 1932-6203 doi: https://doi.org/10.1371/journal.pone.0172111 (e0172111.)
- Xiao-Xia, Y., Hadjiloucas, S. and Zhang, Y. (2017) Pattern classification of medical images: computer aided diagnosis. Springer, pp218. ISBN 9783319570266 doi: https://doi.org/10.1007/978-3-319-57027-3
- Al-Mashhadani, I. B. N. and Hadjiloucas, S. (2017) Port hamiltonian formulation of a memristive switch circuit represented in bond graph. In: 2017 IEEE SENSORS. IEEE. ISBN 9781509010127 doi: https://doi.org/10.1109/ICSENS.2017.8233917 (Proceedings of 2017 IEEE Sensors 29 Oct -1 Nov 2017, Glasgow UK)
- Yin, X.-X., Zhang, Y., Cao, J., Wu, J.-L. and Hadjiloucas, S. (2016) Exploring the complementarity of THz pulse imaging and DCE-MRIs: toward a unified multi-channel classification and a deep learning framework. Computer methods and programs in biomedicine, 137. pp. 87-114. ISSN 1872-7565 doi: https://doi.org/10.1016/j.cmpb.2016.08.026
- Al-Mashhadani, I. and Hadjiloucas, S. (2016) Linearized bond graph of Hodgkin-Huxley memristor neuron model. In: CNNA 2016; 15th International Workshop on Cellular Nanoscale Networks and their Applications, 23-25 Aug 2016, Dresden, Germany.
- Afonso, R. J. M., Galvao, R. K. H., Kienitz, K. H., Alyami, H., Becerra, V. M. and Hadjiloucas, S. (2016) Constrained pre-equalization accounting for multi-path fading emulated using large RC networks: applications to wireless and photonics communications. Optical and Quantum Electronics, 48 (7). 364. ISSN 1572-817X doi: https://doi.org/10.1007/s11082-016-0627-6
- Siuly, , Yin, X., Hadjiloucas, S. and Zhang, Y. (2016) Classification of THz pulse signals using two-dimensional cross-correlation feature extraction and non-linear classifiers. Computer Methods and Programmes in Biomedicine, 127. pp. 64-82. ISSN 0169-2607 doi: https://doi.org/10.1016/j.cmpb.2016.01.017
- Yin, X.-X., Hadjiloucas, S., Zhang, Y., Su, M.-Y., Miao, Y. and Abbott, D. (2016) Pattern identification of biomedical images with time series: contrasting THz pulse imaging with DCE-MRIs. Artificial Intelligence in Medicine, 67. pp. 1-23. ISSN 09333657 doi: https://doi.org/10.1016/j.artmed.2016.01.005
- Jacyntho, L. A., Teixeira, M. C. M., Assuncão, E., Cardim, R., Galvão, R. K. H. and Hadjiloucas, S. (2015) Identification of fractional-order transfer functions using a step excitation. IEEE Transactions on Circuits and Systems II, Express Briefs, 62 (9). pp. 896-900. ISSN 1549-7747 doi: https://doi.org/10.1109/TCSII.2015.2436052
- Yin, X.-X., Hadjiloucas, S., He, J., Zhang, Y., Wang, Y. and Zhang, Z. (2015) Application of complex extreme learning machine to multiclass classification problems with high dimensionality: a THz spectra classification problem. Digital Signal Processing, 40. pp. 40-52. ISSN 1051-2004 doi: https://doi.org/10.1016/j.dsp.2015.01.007
- Trujillo, M., Becerra, V. M. and Hadjiloucas, S. (2014) Applying robust control theory to solve problems in bio-medical sciences: study of an apoptotic model. Journal of Physics Conference Series, 490 (1). 012140. ISSN 1742-6588 doi: https://doi.org/10.1088/1742-6596/490/1/012140
- Yin, X. -X., Hadjiloucas, S. and Zhang, Y. (2014) Complex extreme learning machine applications in terahertz pulsed signals feature sets. Computer Methods and Programmes in Biomedicine, 117 (2). pp. 387-403. ISSN 0169-2607 doi: https://doi.org/10.1016/j.cmpb.2014.06.002
- Hadjiloucas, S. and Galvão, R. K. H. (2014) Fractional order and non-linear system identification algorithms for biomedical applications. Journal of Physics: Conference Series, 490 (1). 012141. ISSN 1742-6588 doi: https://doi.org/10.1088/1742-6596/490/1/012141
- Hadjiloucas, S., Jannah, N., Hwang, F. and Galvão, R. K. H. (2014) On the application of optimal wavelet filter banks for ECG signal classification. Journal of Physics: Conference Series, 490 (1). 012142. ISSN 1742-6588 doi: https://doi.org/10.1088/1742-6596/490/1/012142
- Zhu, Y., Hadjiloucas, S., Chen, J., Long, W. and Li, J. (2014) The chaotic frequency hopping signals for MIMO radar. Journal of Computational Information Systems, 10 (10). pp. 4261-4269. ISSN 1553-9105
- Galvão, R. K. H., Kienitz, K. H., Hadjiloucas, S., Walker, G., Bowen, J., Soares, S. F. C. and Araújo, M. C. U. (2013) Multivariate analysis of the dielectric response of materials modeled using networks of resistors and capacitors. IEEE Transactions on Dielectrics and Electrical Insulation, 20 (3). pp. 995-1008. ISSN 1070-9878 doi: https://doi.org/10.1109/TDEI.2013.6518970
- Hadjiloucas, S., Hashem, A., Becerra, V. and Galvao, R. (2013) Channel equalization for indoor lighting communications networks. Journal of Physics: Conference Series, 450 (1). 012051. ISSN 1742-6588 doi: https://doi.org/10.1088/1742-6596/450/1/012051
- Bowen, J. W., Hadjiloucas, S., Walker, G. C., Hüebers, H.-W. W. and Schubert, J. (2013) Interferometric technique for measuring terahertz antenna phase patterns. IEEE Sensors Journal, 13 (1). pp. 100-110. ISSN 1530-437X doi: https://doi.org/10.1109/JSEN.2012.2226714
- Alyami, H. M., Becerra, V. M. and Hadjiloucas, S. (2013) New opportunities for secure communication networks using shaped femtosecond laser pulses inducing filamentation processes in the atmosphere. Journal of Physics Conference Series, 472. 012009. ISSN 1742-6588 doi: https://doi.org/10.1088/1742-6596/472/1/012009
- Hadjiloucas, S., Walker, G. C. and Bowen, J. W. (2013) One-port de-embedding technique for the quasi-optical characterization of integrated components. IEEE Sensors Journal, 13 (1). pp. 111-123. ISSN 1530-437X doi: https://doi.org/10.1109/JSEN.2012.2226713
- Jannah, N., Hadjiloucas, S., Hwang, F. and Galvao, R. K. H. (2013) Smart-phone based electrocardiogram wavelet decomposition and neural network classification. Journal of Physics: Conference Series, 450. 012019. ISSN 1742-6588 doi: https://doi.org/10.1088/1742-6596/450/1/012019
- Paiva, H. M., Duarte, M. A. Q., Galvao, R. K. H. and Hadjiloucas, S. (2013) Wavelet based detection of changes in the composition of RLC networks. Journal of Physics: Conference Series, 472. 012011. ISSN 1742-6588 doi: https://doi.org/10.1088/1742-6596/472/1/012011
- Walker, G. C., Bowen, J. W., Labaune, J., Jackson, J.-B., Hadjiloucas, S., Roberts, J., Mourou, G. and Menu, M. (2012) Terahertz deconvolution. Optics Express, 20 (25). pp. 27230-27241. ISSN 1094-4087 doi: https://doi.org/10.1364/OE.20.027230
- Hadjiloucas, S. (2012) Interview. Electronics Letters, 48 (21). p. 1314. ISSN 0013-5194 doi: https://doi.org/10.1049/el.2012.3424
- Shaver, A., Hadjiloucas, S., Walker, G.C. and Bowen, J.W. (2012) Femtosecond pulse shaping using differential evolutionary algorithm and wavelet operators. Electronics Letters, 48 (21). pp. 1357-1358. ISSN 0013-5194 doi: https://doi.org/10.1049/el.2012.2292
- Galvão, R. K. H., Hadjiloucas, S., Kienitz, K. H., Paiva, H. M. and Afonso, R. J. M. (2012) Fractional order modeling of large three-dimensional RC networks. IEEE Transactions on Circuits & Systems I: regular papers, 60 (3). pp. 624-637. ISSN 1549-8328 doi: https://doi.org/10.1109/TCSI.2012.2209733
- Walker, G. C., Labaune, J., Bowen, J. W., Jackson, J., Hadjiloucas, S., Mourou, G. and Menu, M. (2011) Deconvolution: imaging the unturned page. In: 36th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2011), 02-07 Oct 2011, Houston, TX.
- Hadjiloucas, S., Walker, G.C. and Bowen, J. (2011) Extending Murty interferometry to the Terahertz part of the spectrum. Journal of Physics: Conference Series, 307. 012040. ISSN 1742-6588 doi: https://doi.org/10.1088/1742-6596/307/1/012012
- Hadjiloucas, S., Walker, G.C., Bowen, J.W. and Galvão, R.K.H. (2011) System identification algorithms for the analysis of dielectric responses from broadband spectroscopies. Journal of Physics: Conference Series, 310. 012002. ISSN 1742-6588 doi: https://doi.org/10.1088/1742-6596/310/1/012002
- Trujillo, M. M., Hadjiloucas, S. and Becerra, V. (2011) A robust controller design method for feedback substitution schemes using genetic algorithms. Journal of Physics: Conference Series, 307 (1). 012040. ISSN 1742-6596 doi: https://doi.org/10.1088/1742-6596/307/1/012040
- Hadjiloucas, S., Walker, G. C. and Bowen, J. W. (2010) Quantifying user perception of foodstuffs using THz spectrometry. In: IRMMW-THz 2010: the 35th International Conference on Infrared, Millimeter and Terahertz Waves, 5-10 Sept 2010, Rome, Italy.
- Trujillo, M., Hadjiloucas, S. and Becerra, V. M. (2010) Robust H∞ optimal controller designs for feedback substitution schemes using LSDP and MOGA 9th IEEE International Conference in Systems Man and Cybernetics. In: 9th IEEE International Conference in Systems Man and Cybernetics, Reading UK.
- Hadjiloucas, S. (2010) Mapping and controlling molecular processes: The application of control theory and system identification algorithms to ASOPS and other fast pulse spectroscopies. In: European Science Foundation Workshop, 7-10 June 2010, EPFL Lausanne Switzerland, pp. 101-102.
- Hadjiloucas, S., Walker, G. C., Bowen, J. W. and Karatzas, L. (2010) Proposed design for an ultrasonic optical force-feedback microphone. In: GDR-AFPAC 6th Conference of the GDR 2501 Research on Ultrasound Propagation for NDT jointly with the 10th Anglo-French Physical Acoustics Conference (AFPAC) Organised by the IOP Physical Acoustics Group and the French Group de Recherche (GDR) and GAPSUS, 18-22 January 2010, Castle Green Hotel, Lake District, UK , p. 74.
- Hadjiloucas, S., Walker, G. C., Bowen, J. W. and Galvão, R. K. H. (2010) Femto-chemometrics: the signal processing of fast pulse transients. In: 35th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2010), 05-10 Sep 2010, Rome, Italy.
- Hadjiloucas, S., Walker, G. and Bowen, J. (2010) Quantifying user perception of foodstuffs using THz spectrometry. In: 35th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2010), 05-10 Sep 2010, Rome, Italy.
- Hadjiloucas, S., Walker, G.C., Bowen, J.W., Becerra, V.M., Zafiropoulos, A. and Galvão, R.K.H. (2009) High signal to noise ratio THz spectroscopy with ASOPS and signal processing schemes for mapping and controlling molecular and bulk relaxation processes. Journal of Physics Conference Series, 183. 012003. ISSN 1742-6588 doi: https://doi.org/10.1088/1742-6596/183/1/012003
- Hadjiloucas, S., Zafiropoulos, A. , Walker, G.C. and Bowen, J.W. (2009) Inferring relative water content and water availability using THz radiation. In: 2nd annual meeting on THz sensing: techniques and applications, The Institute of Physics, London.
- Hadjiloucas, S., Franklin, T., Becerra, V. M., Walker, G. C. and Bowen, J. W. (2009) Optimising the feedback loop of a millimetre-wave absolute photoacoustic power meter using H-infinity control synthesis. Journal of Physics : Conference Series , 178 (1). p. 12042. ISSN 1742-6588 doi: https://doi.org/10.1088/1742-6596/178/1/012042
- Hadjiloucas, S., Walker, G. C., Bowen, J. W. and Karatzas, L. S. (2009) Performance limitations of piezoelectric and force feedback electrostatic transducers in different applications. Journal of Physics: Conference Series, 178 (1). 012036. ISSN 1742-6588 doi: https://doi.org/10.1088/1742-6596/178/1/012036
- Hadjiloucas, S., Walker, G. C., Bowen, J. W. and Zafiropoulos, A. (2009) Propagation of errors from a null balance terahertz reflectometer to a sample's relative water content. Journal of Physics: Conference Series, 178 (1). 012012. ISSN 1742-6588 doi: https://doi.org/10.1088/1742-6596/178/1/012012
- Hadjiloucas, S., Shaver, A., Walker, G.C. and Bowen, J.W. (2009) Prospects for bio-molecular control using femtosecond transients parametrised in the wavelet domain. In: Biophotonics: technology and applications meeting, The Institute of Physics, London .
- Bowen, J.W., Walker, G.C., Alozie, D. and Hadjiloucas, S. (2008) Achieving sub-wavelength spatial resolution in terahertz imaging by exploiting phase cancellation effects. In: European Optical Society Annual Meeting: EOSAM - TOM 2: Terahertz Science and Technology, Paris, France.
- Yin, X.X., Hadjiloucas, S., Fischer, B.M., Ng, B.W.H., Paiva, H.M., Galvao, R.K.H., Walker, G.C., Bowen, J.W. and Abbott, D. (2008) Classification of lactose and mandelic acid THz spectra using subspace and wavelet-packet algorithms. In: Conference on Microelectronics - Design, Technology and Packaging III, Canberra, Australia.
- Hadjiloucas, S., Shaver, A., Walker, G.C. and Bowen, J.W. (2008) Prospects for bio-molecular control using femtosecond transients parametrised in the wavelet domain [poster]. In: European Optical Society Annual Meeting, Paris, France.
- Fischer, B.M., Yin, X.X., Ng, B.W.H., Abbott, D., Galvao, R.K.H., Paiva, H.M., Hadjiloucas, S., Walker, G.C. and Bowen, J.W. (2008) Subspace and wavelet-packet algorithms for de-noising and classifying broadband THz transients. In: 33rd International Conference on Infrared, Millimeter and Terahertz Waves, Pasadena, USA. doi: https://doi.org/10.1109/ICIMW.2008.4665758
- Bowen, J.W., Walker, G.C. and Hadjiloucas, S. (2008) System-dependent features in terahertz time-domain images and spectra. In: IOP ISAT meeting on ‘terahertz sensing: techniques and applications', London, UK.
- Hadjiloucas, S., Walker, G.C., Bowen, J.W. and Karatzas, L.S. (2008) An optical force-feedback microphone for sensing biophotonics related photoacoustic and photo-thermal phenomena [poster]. In: European Optical Society Annual Meeting, Paris, France.
- Hadjiloucas, S., Walker, G., Bowen, J. and Karatzas, L. S. (2008) An optical force-feedback microphone for sensing biophotonics related photoacoustic and photothermal phenomena. In: EOS Annual Meeting, 2008, Paris, France, p. 968.
- Hadjiloucas, S., Walker, G. C., Bowen, J. W., Paiva, H. A., Galvao, R. K. H. and Dudley, R. (2007) Apodisation, denoising and system identification techniques for THz transients in the wavelet domain. In: 2007 Joint 32nd International Conference on Infrared and Millimeter Waves and 15th International Conference on Terahertz Electronics, Vols 1 and 2, Cardiff.
- Yin, X.X., Ng, B.W.H., Ferguson, B., Abbott, D. and Hadjiloucas, S. (2007) Application of auto regressive models of wavelet sub-bands for classifying Terahertz pulse measurements. Journal of Biological Systems, 15 (4). pp. 551-571. ISSN 0218-3390 doi: https://doi.org/10.1142/S0218339007002374
- Galvao, R. K. H., Izhac, A., Hadjiloucas, S., Becerra, V. M. and Bowen, J. W. (2007) MIMO Wiener model identification for large scale fading of wireless mobile communications links. IEEE Communications Letters, 11 (6). pp. 513-515. ISSN 1089-7798 doi: https://doi.org/10.1109/lcomm.2007.070242
- Galvão, R. K. H., Hadjiloucas, S., Zafiropoulos, A., Walker, G. C., Bowen, J. W. and Dudley, R. (2007) Optimization of apodization functions in terahertz transient spectrometry. Optics Letters, 32 (20). pp. 3008-3010. ISSN 0146-9592
- Walker, G. C., Bowen, J. W., Hadjiloucas, S., Zafiropoulos, A., Hadlington, T. and Chamberlain, J. M. (2007) Quantification of boundary definition using pulsed terahertz radiation for wedged geometries. In: 2007 Joint 32nd International Conference on Infrared and Millimeter Waves and 15th International Conference on Terahertz Electronics, Vols 1 and 2. IEEE, New York, pp. 512-513. ISBN 9781424414383
- Bowen, J. W., Walker, G. C. and Hadjiloucas, S. (2007) Sample-induced beam distortions in terahertz time domain spectroscopy and imaging systems. In: 2007 Joint 32nd International Conference on Infrared and Millimeter Waves and 15th International Conference on Terahertz Electronics, Vols 1 and 2. IEEE, New York, pp. 208-209. ISBN 9781424414383
- Zafiropoulos, A., Hadjiloucas, S., Walker, G. C., Bowen, J. W. and Dudley, R. (2007) Towards a THz osmometer. In: 2007 Joint 32nd International Conference on Infrared and Millimeter Waves and 15th International Conference on Terahertz Electronics, Vols 1 and 2. UNSPECIFIED, New York, pp. 295-296. ISBN 9781424414383
- Galvao, R.K.H., Hadjiloucas, S., Izhac, A., Becerra, V.M. and Bowen, J.M. (2007) Wiener-System subspace identification for mobile wireless mm-wave networks. IEEE Transactions on Vehicular Technology, 56 (4). pp. 1935-1948. ISSN 0018-9545 doi: https://doi.org/10.1109/TVT.2007.897250
- Froese, T., Hadjiloucas, S., Galvao, R. K. H., Becerra, V. M. and Coelho, C. J. (2006) Comparison of extrasystolic ECG signal classifiers using discrete wavelet transforms. Pattern Recognition Letters, 27 (5). pp. 393-407. ISSN 0167-8655 doi: https://doi.org/10.1016/j.patrec.2005.09.002
- Hadjiloucas, S., Shaver, A.K., Walker, G.C., Bowen, J.W. and O'Leary, S.V. (2006) Feedback control of Femtosecond laser pulse shapes using Labview. National Instruments Labview in the Curriculum 2006 Academic Conference. 34 - 45.
- Hadjiloucas, S. (2006) Femtosecond optical technologies for biomolecular control. In: Workshop on wave phenomena, Reading, United Kingdom.
- Hadjiloucas, S., Walker, G.C. and Bowen, J.W. (2006) Femtosecond reserach activities at Reading. In: LSF User Meeting, Rutherford Appleton Laboratory, Oxon.
- Hadjiloucas, S. (2006) Instrumentation, signal processing and applications of optical and far-infrared spectroscopy. In: UNSPECIFIED, University of Campinas, Brazil.
- Bowen, J. W., Hadjiloucas, S., Towlson, B. M., Karatzas, L. S., Wootton, S. T. G., Cronin, N. J., Davies, S. R., McIntosh, C. E., Chamberlain, J. M., Miles, R. E. and Pollard, R. D. (2006) Micromachined waveguide antennas for 1.6 THz. Electronics Letters, 42 (15). pp. 842-843. ISSN 0013-5194 doi: https://doi.org/10.1049/el:20061766
- Hadjiloucas, S. (2006) THz technologies and models for mobile communications. In: Instituto Tecnologico de Aeronautica, San Jose dos Campos, Brazil.
- Hadjiloucas, S. and Shaver, A.K. (2005) Labview-Matlab platform for the femtosecond pulse shaping. In: Software presentatino to the Centre for Basic, Thermal and Length Metrology, Teddington, UK.
- Hadjiloucas, S. and Bowen, J.W. (2005) Measurement facilities for the electronics community at Reading. In: Poster Presentation at the EPSRC Interconnections, Reading, UK.
- Hadjiloucas, S., Shaver, A.K., Becerra, V.M., Walker, G.M., Bowen, J.W., O'Leary, S.V., Frasinski, L.J. and Galvao, R.K.H. (2005) Pseudospectral issues in tailored femtosecond pulses. Laser driven plasma acelerators: new sources of energetic particles and radiation. In: Poster Presentation at the Royal Society Discussion Meeting, London, UK.
- Galvao, R. K. H., Hadjiloucas, S., Becerra, V. M. and Bowen, J. W. (2005) Subspace system identification framework for the analysis of multimoded propagation of THz-transient signals. Measurement Science & Technology, 16 (5). pp. 1037-1053. ISSN 0957-0233 doi: https://doi.org/10.1088/0957-0233/16/5/001
- Hadjiloucas, S. (2005) Thz technology at the ULL and its potential for cross-disciplinary work at Reading University. In: Physics Colloquia Presentation, Reading, UK.
- Hadjiloucas, S., Galvao, R. K. H., Becerra, V. M., Bowen, J. W., Martini, R., Brucherseifer, M., Pellemans, H. P. M., Bolivar, P. H., Kurz, H. and Chamberlain, J. M. (2004) Comparison of subspace and ARX models of a waveguide's terahertz transient response after optimal wavelet filtering. Ieee Transactions on Microwave Theory and Techniques, 52 (10). pp. 2409-2419. ISSN 0018-9480 doi: https://doi.org/10.1109/tmtt.2004.835983
- Hadjiloucas, S., Bowen, J. W., Galvao, R. K. H. and Becerra, V. M. (2004) Pulse shaping using state space algorithms. In: Thumm, M. and Wiesbeck, W. (eds.) Conference Digest of the 2004 Joint 29th International Conference on Infrared and Millimeter Waves and 12th International Conference on Terahertz Electronics. IEEE, New York, pp. 415-416. ISBN 0780384903
- Hadjiloucas, S., Izhac, A., Galvao, R. K. H., Bowen, J. W. and Becerra, V. M. (2004) State-space model identification of a wireless THz network. In: Thumm, M. and Wiesbeck, W. (eds.) Conference Digest of the 2004 Joint 29th International Conference on Infrared and Millimeter Waves and 12th International Conference on Terahertz Electronics. IEEE, New York, pp. 375-376. ISBN 0780384903
- Hadjiloucas, S., Galvao, R.K.H., Izhac, A., Becerra, V.M. and Bowen, J.W. (2004) A black-box identification framework for wireless terahertz networks. In: IFAC Symposium, Brazil.
- Bowen, J. W., Walker, G. C., Hadjiloucas, S. and Berry, E. (2004) The consequences of diffractively spreading beams in ultrafast THz spectroscopy. In: Thumm, M. and Wiesbeck, W. (eds.) Conference Digest of the 2004 Joint 29th International Conference on Infrared and Millimeter Waves and 12th International Conference on Terahertz Electronics. IEEE, New York, pp. 551-552. ISBN 0780384903
- Chahal, M.S., Bowen, J.W., Hadjiloucas, S. and Crabbe, M.J.C. (2003) Cell cycle studies of the non-thermal effects of near-millimetre wave radiation on the growth of S. cerevisiae. In: 11th IEEE International Conference on Terahertz Electronics, Sendai, Japan.
- Hadjiloucas, S., Galvao, R. K. H., Bowen, J. W., Martini, R., Brucherseifer, M., Pellemans, H. P. M., Bolivar, P. H., Kurz, H., Digby, J., Parkhurst, G. M. and Chamberlain, J. M. (2003) Measurement of propagation constant in waveguides with wideband coherent terahertz spectroscopy. Journal of the Optical Society of America B-Optical Physics, 20 (2). pp. 391-401. ISSN 0740-3224
- Galvâo, R. K. H., Hadjiloucas, S., Bowen, J. W. and Coelho, C. J. (2003) Optimal discrimination and classification of THz spectra in the wavelet domain. Optics Express, 11 (12). pp. 1462-1473. ISSN 1094-4087
- Bowen, J. W., Hadjiloucas, S. and Galvâo, (2003) Optimisation of integration time in Fourier transform Spectrometry using optimal wavelet transforms. In: 28th International Conference on Infrared and Millimeter Waves, Otsu, Japan.
- Hadjiloucas, S., Galvao, R. K. H., Becerra, V. M., Bowen, J. W., Martini, R., Brucherseifer, M., Pellemans, H. P. M., Bolivar, P. H., Kurz, H. and Chamberlain, J. M. (2003) Wavelet filtered modelling applied to measurements of a waveguide's THz time domain response. In: IEEE 10th International Conference on Terahertz Electronics (THz 2002), 9-10 Sep 2002, Cambridge, UK, pp. 129-132. doi: https://doi.org/10.1109/THZ.2002.1037608
- Hadjiloucas, S., Galvão, R. K. H. and Bowen, J. W. (2002) Analysis of spectroscopic measurements of leaf water content at terahertz frequencies using linear transforms. Journal of the Optical Society of America A, 19 (12). pp. 2495-2509. ISSN 1084-7529 doi: https://doi.org/10.1364/JOSAA.19.002495
- Hadjiloucas, S., Chahal, M. S. and Bowen, J. W. (2002) Preliminary results on the non-thermal effects of 200-350 GHz radiation on the growth rate of S. cerevisiae cells in microcolonies. Physics in Medicine and Biology, 47 (21). pp. 3831-3839. ISSN 1361-6560 doi: https://doi.org/10.1088/0031-9155/47/21/322
- Galvão, R. K. H., Hadjiloucas, S. and Bowen, J. W. (2002) Use of the statistical properties of the wavelet-transform coefficients for optimization of integration time in Fourier transform spectrometry. Optics Letters, 27 (8). pp. 643-645. ISSN 1539-4794 doi: https://doi.org/10.1364/OL.27.000643
- Digby, J.W., McIntosh, C.E., Parkhurst, G.M., Towlson, B.M., Hadjiloucas, S., Bowen, J. W., Chamberlain, J.M., Pollard, R.D., Miles, R.E., Steenson, D.P., Karatzas, L.S., Cronin, N.J. and Davies, S.R. (2000) Fabrication and characterization of micromachined rectangular waveguide components for use at millimeter-wave and terahertz frequencies. IEEE Transactions on Microwave Theory and Techniques, 48 (8). pp. 1293-1302. ISSN 0018-9480 doi: https://doi.org/10.1109/22.859472
- Hadjiloucas, S., Irvine, J. and Keating, D. A. (2000) Feedback dew-point sensor utilising optimally cut plastic optical fibres. Measurement Science and Technology, 11 (1). p. 1. ISSN 1361-6501 doi: https://doi.org/10.1088/0957-0233/11/1/301
- Hadjiloucas, S., Irvine, J. J. and Bowen, J. W. (2000) Radiometric analysis of the light coupled by optimally cut plastic optical fiber amplitude modulating reflectance displacement sensors. Review of Scientific Instruments, 71 (8). pp. 3007-3009. ISSN 0034-6748 doi: https://doi.org/10.1063/1.1304858
- Hadjiloucas, S. and Keating, D. (2000) Recent advances in measurement and instrumentation systems based on optical techniques. In: Vaezi-Nejad , S. M. (ed.) Selected topics in advanced solid state and fibre optic sensors. IET Circuits, Devices and Systems Series 11 (11). IET The Institution of Engineering and Technology, Stevenage Herts, pp. 33-74. ISBN 9780852967799
- Hadjiloucas, S. and Keating , D. (2000) Recent development on amplitude, wavelength, phase and polarisation modulating sensors. In: Vaezi-Nejad , S. M. (ed.) Selected topics in advanced solid state and fibre optic sensors. IET Circuits, Devices and Systems Series 11 . IET The Institution of Engineering and Technology, Stevenage Herts, pp. 75-122. ISBN 9780852967799
- Hadjiloucas, S., Karatzas, L. S. and Bowen, J. W. (1999) Measurements of leaf water content using terahertz radiation. IEEE Transactions on Microwave Theory and Techniques, 47 (2). pp. 142-149. ISSN 0018-9480 doi: https://doi.org/10.1109/22.744288
- Hadjiloucas, S. and Bowen, J. W. (1999) Precision of quasi-optical null-balanced bridge techniques for transmission and reflection coefficient measurements. Review of Scientific Instruments, 70 (1). 213. ISSN 0034-6748 doi: https://doi.org/10.1063/1.1149568
- Michie, W.C., Culshaw, B., McLean, A., Konstantaki, M. and Hadjiloucas, S. (1997) Distributed water ingress and water potential measurements using fibre optics. Cement and Concrete Composites, 19 (1). pp. 35-44. ISSN 0958-9465 doi: https://doi.org/10.1016/S0958-9465(96)00039-X
- Irvine, J. J., Hadjiloucas, S., Keating, D. A. and Usher, M. J. (1996) Automatic optical fibre feedback potometer for transpiration studies. Measurement Science and Technology, 7 (11). pp. 1611-1618. ISSN 1361-6501 doi: https://doi.org/10.1088/0957-0233/7/11/010
- Hadjiloucas, S. (1996) Optical sensors and techniques for plant-water relations. PhD thesis, University of Reading.
- Hadjiloucas, S., Karatzas, L.S., Keating, D.A. and Usher, M.J. (1995) Optical sensors for monitoring water uptake in plants. Journal of Lightwave Technology, 13 (7). pp. 1421-1428. ISSN 0733-8724 doi: https://doi.org/10.1109/50.400707
Study for a PhD with Dr Sillas Hadjiloucas