Unmanned Aerial Vehicles (UAV)s can control their altitude and orientation using the horizon as a... more Unmanned Aerial Vehicles (UAV)s can control their altitude and orientation using the horizon as a reference. Typically this task is performed via edge-detection vision processing techniques implemented in a computer or digital electronics. We demonstrate a proof-of-principle for a memristive cellular automata (CA) system which can simply interface with an analog electronic control system. Our aim is a cheaper, lighter and more robust low-level system. Low-quality, noisy and wideangle images consistent with cheap cameras have been tested and, even with these issues, the system can recognise the tilt angle and express it as relative activation of cells at the edge of a CA which could be used to drive motors to right the aircraft.
Solvation is limited by the frustration between solvent shells and controlled by available volume... more Solvation is limited by the frustration between solvent shells and controlled by available volume, therefore co-solvent molar volume is critical.
Solvent selection, using parameters ranges matched to experimentally determined "good" cosolvents... more Solvent selection, using parameters ranges matched to experimentally determined "good" cosolvents, allows identification of renewably derived, non-hazardous γ-valerolactone as a viable alternative to dipolar aprotic solvents in ionic liquid mediated dissolution of cellulose.
Solvent selection, using parameters ranges matched to experimentally determined "good" cosolvents... more Solvent selection, using parameters ranges matched to experimentally determined "good" cosolvents, allows identification of renewably derived, non-hazardous γ-valerolactone as a viable alternative to dipolar aprotic solvents in ionic liquid mediated dissolution of cellulose.
Ella Gale opened discussion of the introductory lecture by Rainer Waser: At the end of your talk ... more Ella Gale opened discussion of the introductory lecture by Rainer Waser: At the end of your talk you introduced complementary resistance switches, which you used for binary pattern matching. Do you have any insight into how you might use these systems to do computation in the real number space? Rainer Waser answered: We are currently working on this. (2:[2]2) Ilia Valov said: From your point of view, at the moment, what are the hottest points of research in memristive cells? What are the main challenges? Rainer Waser answered: The hot points of research are the physical understanding of the reliability-limiting processes in conjunction with the material's treasure map and, from the application side, the development of a convincing neuromorphic circuit that shows clear benet compared to standard CMOS solutions (4:[4]4) Hans Hilgenkamp asked: Most memristor embodiments shown in the papers are based on stacked devices with the current ow perpendicular to the plane. Do all applications necessarily favour this type of conguration, or are there also applications for which an in-plane conguration would be preferred? DIS C8FD90059K
This paper presents rules based on the physical behaviour of the device to instantiate logic gate... more This paper presents rules based on the physical behaviour of the device to instantiate logic gates for further computation and a method of understanding the memristor’s operation as a type of non-linear, sequence-sensitive perceptron.
2014 Uksim Amss 16th International Conference on Computer Modelling and Simulation, Mar 1, 2014
The memristor, the recently discovered fundamental circuit element, is of great interest for neur... more The memristor, the recently discovered fundamental circuit element, is of great interest for neuromorphic computing, nonlinear electronics and computer memory. It is usually modelled either using Chua's equations, which lack material device properties, or using Strukov's phenomenological model (or models derived from it), which deviates from Chua's definitions due to the lack of a magnetic flux term. It is shown that by modelling the magnetostatics of the memory-holding ionic current (oxygen vacancies in the Strukov memristor), the memristor's magnetic flux can be identified as the flux arising from the ions. This leads to a novel theory of memristance consisting of two components: 1. A memory function which describes how the memristance, as felt by the ions, affects the conducting electrons located in the 'on' part of the device; 2. A conservation function which describes the time-varying resistance in the 'off' part of the device. This model allows for a straightforward incorporation of the ions within the electronic theory and relates Chua's constitutive definition of a memristor with device material properties for the first time.
2014 UKSim-AMSS 16th International Conference on Computer Modelling and Simulation, 2014
The memristor, the recently discovered fundamental circuit element, is of great interest for neur... more The memristor, the recently discovered fundamental circuit element, is of great interest for neuromorphic computing, nonlinear electronics and computer memory. It is usually modelled either using Chua's equations, which lack material device properties, or using Strukov's phenomenological model (or models derived from it), which deviates from Chua's definitions due to the lack of a magnetic flux term. It is shown that by modelling the magnetostatics of the memory-holding ionic current (oxygen vacancies in the Strukov memristor), the memristor's magnetic flux can be identified as the flux arising from the ions. This leads to a novel theory of memristance consisting of two components: 1. A memory function which describes how the memristance, as felt by the ions, affects the conducting electrons located in the 'on' part of the device; 2. A conservation function which describes the time-varying resistance in the 'off' part of the device. This model allows for a straightforward incorporation of the ions within the electronic theory and relates Chua's constitutive definition of a memristor with device material properties for the first time.
Abstract This paper presents a spiking neuro-evolutionary system which implements memristors as n... more Abstract This paper presents a spiking neuro-evolutionary system which implements memristors as neuromodulatory connections, ie whose weights can vary during a trial. The evolutionary design process exploits parameter self-adaptation and a constructionist approach, allowing the number of neurons, connection weights, and inter-neural connectivity pattern to be evolved for each network. Additionally, each memristor has its own conductance profile, which alters the neuromodulatory behaviour of the memristor and ...
2011 IEEE Symposium on Artificial Life (ALIFE), 2011
Abstract This paper presents a spiking neuro-evolutionary system which implements memristors as n... more Abstract This paper presents a spiking neuro-evolutionary system which implements memristors as neuromodulatory connections, ie whose weights can vary during a trial. The evolutionary design process exploits parameter self-adaptation and a constructionist approach, allowing the number of neurons, connection weights, and inter-neural connectivity pattern to be evolved for each network. We demonstrate that this approach allows the evolution of networks of appropriate complexity to emerge whilst exploiting the ...
In laboratory experiments we demonstrate that protoplasmic tubes of acellular slime mould Physaru... more In laboratory experiments we demonstrate that protoplasmic tubes of acellular slime mould Physarum polycephalum show current versus voltage profiles consistent with memristive systems. This result complements previous findings on memristive properties of other living systems (human skin and blood and leaves) and contributes to development of self-growing bioelectronic circuits.
Gale, E., Adamatzky, A. and de Lacy Costello, B. (2012) Fabrication and modelling of titanium dio... more Gale, E., Adamatzky, A. and de Lacy Costello, B. (2012) Fabrication and modelling of titanium dioxide memristors. In: RSC Younger Members Symposium 2012, Nottingham, UK, 13 June 2012. ... We recommend you cite the published version. The publisher's URL is http://eprints.uwe.ac.uk/17057/ ... Poster abstract was referred and selected for conference. ... UWE has obtained warranties from all depositors as to their title in the material deposited and as to their right to deposit such material. ... UWE makes no representation or warranties ...
The caption states the potentiation and depression observed in Fig. 21a and 21b respectively are ... more The caption states the potentiation and depression observed in Fig. 21a and 21b respectively are for separate devices with different composition. Is it that each device exhibits only one of the behaviours shown or do the two devices exhibit both potentiation and depression as well? Also, what is the retention time of this potentiation and depression? Hyunsang Hwang responded: Thank you for your comment. It was a typo. We measured potentiation and depression using a Mo/TiO x /TiN device. I will revise the manuscript. Although we did not perform an in-depth study on retention characteristics, we cannot guarantee long-term retention using the Mo/TiO x /TiN device. Hyunsang Hwang answered: Thank you for your comments. I agree with your comments. We consider I-V linearity to implement matrix multiplication using an analog input voltage. If we cannot meet ideal I-V linearity, we can integrate the read current with multiple pulses which require additional circuits.
The memristor is the fundamental non-linear circuit element, with uses in computing and computer ... more The memristor is the fundamental non-linear circuit element, with uses in computing and computer memory. ReRAM (Resistive Random Access Memory) is a resistive switching memory proposed as a non-volatile memory. In this review we shall summarise the state of the art for these closely-related fields, concentrating on titanium dioxide, the well-utilised and archetypal material for both. We shall cover material properties, switching mechanisms and models to demonstrate what ReRAM and memristor scientists can learn from each other and examine the outlook for these technologies.
Unmanned Aerial Vehicles (UAV)s can control their altitude and orientation using the horizon as a... more Unmanned Aerial Vehicles (UAV)s can control their altitude and orientation using the horizon as a reference. Typically this task is performed via edge-detection vision processing techniques implemented in a computer or digital electronics. We demonstrate a proof-of-principle for a memristive cellular automata (CA) system which can simply interface with an analog electronic control system. Our aim is a cheaper, lighter and more robust low-level system. Low-quality, noisy and wideangle images consistent with cheap cameras have been tested and, even with these issues, the system can recognise the tilt angle and express it as relative activation of cells at the edge of a CA which could be used to drive motors to right the aircraft.
Solvation is limited by the frustration between solvent shells and controlled by available volume... more Solvation is limited by the frustration between solvent shells and controlled by available volume, therefore co-solvent molar volume is critical.
Solvent selection, using parameters ranges matched to experimentally determined "good" cosolvents... more Solvent selection, using parameters ranges matched to experimentally determined "good" cosolvents, allows identification of renewably derived, non-hazardous γ-valerolactone as a viable alternative to dipolar aprotic solvents in ionic liquid mediated dissolution of cellulose.
Solvent selection, using parameters ranges matched to experimentally determined "good" cosolvents... more Solvent selection, using parameters ranges matched to experimentally determined "good" cosolvents, allows identification of renewably derived, non-hazardous γ-valerolactone as a viable alternative to dipolar aprotic solvents in ionic liquid mediated dissolution of cellulose.
Ella Gale opened discussion of the introductory lecture by Rainer Waser: At the end of your talk ... more Ella Gale opened discussion of the introductory lecture by Rainer Waser: At the end of your talk you introduced complementary resistance switches, which you used for binary pattern matching. Do you have any insight into how you might use these systems to do computation in the real number space? Rainer Waser answered: We are currently working on this. (2:[2]2) Ilia Valov said: From your point of view, at the moment, what are the hottest points of research in memristive cells? What are the main challenges? Rainer Waser answered: The hot points of research are the physical understanding of the reliability-limiting processes in conjunction with the material's treasure map and, from the application side, the development of a convincing neuromorphic circuit that shows clear benet compared to standard CMOS solutions (4:[4]4) Hans Hilgenkamp asked: Most memristor embodiments shown in the papers are based on stacked devices with the current ow perpendicular to the plane. Do all applications necessarily favour this type of conguration, or are there also applications for which an in-plane conguration would be preferred? DIS C8FD90059K
This paper presents rules based on the physical behaviour of the device to instantiate logic gate... more This paper presents rules based on the physical behaviour of the device to instantiate logic gates for further computation and a method of understanding the memristor’s operation as a type of non-linear, sequence-sensitive perceptron.
2014 Uksim Amss 16th International Conference on Computer Modelling and Simulation, Mar 1, 2014
The memristor, the recently discovered fundamental circuit element, is of great interest for neur... more The memristor, the recently discovered fundamental circuit element, is of great interest for neuromorphic computing, nonlinear electronics and computer memory. It is usually modelled either using Chua's equations, which lack material device properties, or using Strukov's phenomenological model (or models derived from it), which deviates from Chua's definitions due to the lack of a magnetic flux term. It is shown that by modelling the magnetostatics of the memory-holding ionic current (oxygen vacancies in the Strukov memristor), the memristor's magnetic flux can be identified as the flux arising from the ions. This leads to a novel theory of memristance consisting of two components: 1. A memory function which describes how the memristance, as felt by the ions, affects the conducting electrons located in the 'on' part of the device; 2. A conservation function which describes the time-varying resistance in the 'off' part of the device. This model allows for a straightforward incorporation of the ions within the electronic theory and relates Chua's constitutive definition of a memristor with device material properties for the first time.
2014 UKSim-AMSS 16th International Conference on Computer Modelling and Simulation, 2014
The memristor, the recently discovered fundamental circuit element, is of great interest for neur... more The memristor, the recently discovered fundamental circuit element, is of great interest for neuromorphic computing, nonlinear electronics and computer memory. It is usually modelled either using Chua's equations, which lack material device properties, or using Strukov's phenomenological model (or models derived from it), which deviates from Chua's definitions due to the lack of a magnetic flux term. It is shown that by modelling the magnetostatics of the memory-holding ionic current (oxygen vacancies in the Strukov memristor), the memristor's magnetic flux can be identified as the flux arising from the ions. This leads to a novel theory of memristance consisting of two components: 1. A memory function which describes how the memristance, as felt by the ions, affects the conducting electrons located in the 'on' part of the device; 2. A conservation function which describes the time-varying resistance in the 'off' part of the device. This model allows for a straightforward incorporation of the ions within the electronic theory and relates Chua's constitutive definition of a memristor with device material properties for the first time.
Abstract This paper presents a spiking neuro-evolutionary system which implements memristors as n... more Abstract This paper presents a spiking neuro-evolutionary system which implements memristors as neuromodulatory connections, ie whose weights can vary during a trial. The evolutionary design process exploits parameter self-adaptation and a constructionist approach, allowing the number of neurons, connection weights, and inter-neural connectivity pattern to be evolved for each network. Additionally, each memristor has its own conductance profile, which alters the neuromodulatory behaviour of the memristor and ...
2011 IEEE Symposium on Artificial Life (ALIFE), 2011
Abstract This paper presents a spiking neuro-evolutionary system which implements memristors as n... more Abstract This paper presents a spiking neuro-evolutionary system which implements memristors as neuromodulatory connections, ie whose weights can vary during a trial. The evolutionary design process exploits parameter self-adaptation and a constructionist approach, allowing the number of neurons, connection weights, and inter-neural connectivity pattern to be evolved for each network. We demonstrate that this approach allows the evolution of networks of appropriate complexity to emerge whilst exploiting the ...
In laboratory experiments we demonstrate that protoplasmic tubes of acellular slime mould Physaru... more In laboratory experiments we demonstrate that protoplasmic tubes of acellular slime mould Physarum polycephalum show current versus voltage profiles consistent with memristive systems. This result complements previous findings on memristive properties of other living systems (human skin and blood and leaves) and contributes to development of self-growing bioelectronic circuits.
Gale, E., Adamatzky, A. and de Lacy Costello, B. (2012) Fabrication and modelling of titanium dio... more Gale, E., Adamatzky, A. and de Lacy Costello, B. (2012) Fabrication and modelling of titanium dioxide memristors. In: RSC Younger Members Symposium 2012, Nottingham, UK, 13 June 2012. ... We recommend you cite the published version. The publisher's URL is http://eprints.uwe.ac.uk/17057/ ... Poster abstract was referred and selected for conference. ... UWE has obtained warranties from all depositors as to their title in the material deposited and as to their right to deposit such material. ... UWE makes no representation or warranties ...
The caption states the potentiation and depression observed in Fig. 21a and 21b respectively are ... more The caption states the potentiation and depression observed in Fig. 21a and 21b respectively are for separate devices with different composition. Is it that each device exhibits only one of the behaviours shown or do the two devices exhibit both potentiation and depression as well? Also, what is the retention time of this potentiation and depression? Hyunsang Hwang responded: Thank you for your comment. It was a typo. We measured potentiation and depression using a Mo/TiO x /TiN device. I will revise the manuscript. Although we did not perform an in-depth study on retention characteristics, we cannot guarantee long-term retention using the Mo/TiO x /TiN device. Hyunsang Hwang answered: Thank you for your comments. I agree with your comments. We consider I-V linearity to implement matrix multiplication using an analog input voltage. If we cannot meet ideal I-V linearity, we can integrate the read current with multiple pulses which require additional circuits.
The memristor is the fundamental non-linear circuit element, with uses in computing and computer ... more The memristor is the fundamental non-linear circuit element, with uses in computing and computer memory. ReRAM (Resistive Random Access Memory) is a resistive switching memory proposed as a non-volatile memory. In this review we shall summarise the state of the art for these closely-related fields, concentrating on titanium dioxide, the well-utilised and archetypal material for both. We shall cover material properties, switching mechanisms and models to demonstrate what ReRAM and memristor scientists can learn from each other and examine the outlook for these technologies.
Resilient electronics. Presented at TES Milton Keynes, 2013.
There is a conference paper associa... more Resilient electronics. Presented at TES Milton Keynes, 2013. There is a conference paper associated with this
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Papers by Ella Gale
There is a conference paper associated with this