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Articles 1 - 15 of 15
Full-Text Articles in Physical Sciences and Mathematics
Intelligent Modelling And Control Of Grinding, Li Xue, Fazel Naghdy, John Simpson, Devi Saini
Intelligent Modelling And Control Of Grinding, Li Xue, Fazel Naghdy, John Simpson, Devi Saini
Professor Fazel Naghdy
No abstract provided.
Heuristic Monitoring And Control Of Surface Finish In Grinding Process, Fazel Naghdy, John Simpson, Li Xue
Heuristic Monitoring And Control Of Surface Finish In Grinding Process, Fazel Naghdy, John Simpson, Li Xue
Professor Fazel Naghdy
No abstract provided.
In Process Control Of Surface Finish In Grinding, Li Xue, Fazel Naghdy, John Simpson
In Process Control Of Surface Finish In Grinding, Li Xue, Fazel Naghdy, John Simpson
Professor Fazel Naghdy
No abstract provided.
Adaptive Self-Organisation Of Wireless Ad-Hoc Control Networks, Fazel Naghdy, Nathan Simiana
Adaptive Self-Organisation Of Wireless Ad-Hoc Control Networks, Fazel Naghdy, Nathan Simiana
Professor Fazel Naghdy
A novel concept called Wireless ad-hoc Control Networks (WACNets), exploring an ad-hoc approach to networked distributed control, has been under study for the last five years in the research group. Such systems represent a new stage in the evolution of distributed control and monitoring. The work carried out in developing an adaptive self-organisation algorithm for WACNet is reported. The algorithm deploys a distance measure technique while satisfying the rules and assumptions developed for WACNet framework. The effectiveness of the algorithm is verified through computer simulation under a number of given scenarios. The results obtained show that the algorithm effectively drives …
Fuzzy Stability Control Of Robotic Manipulator With Input Delays, Haiping Du, Fazel Naghdy, David A. Stirling
Fuzzy Stability Control Of Robotic Manipulator With Input Delays, Haiping Du, Fazel Naghdy, David A. Stirling
Professor Fazel Naghdy
This paper studies the stabilisation control problem of a robotic manipulator with input delays. To deal with the highly nonlinear dynamics of a robotic manipulator, the model-based Takagi-Sugeno (T-S) fuzzy control strategy is applied. With representing the nonlinear robotic manipulator model as a T-S fuzzy model, sufficient conditions for designing a controller such that the system is stabilised with given decay rate are derived by constructing a less conservative Lyapunov-Krasovskii functional and using a tighter bounding technology for cross terms and the free weighting matrix approach. With appropriate derivation, all the required conditions are expressed as linear matrix inequalities (LMIs). …
Active Control Of Along Wind Response Of Tall Building Using A Fuzzy Controller, Fazel Naghdy, Mohammed Aldawod, Bijan Samali, Kenny Kwok
Active Control Of Along Wind Response Of Tall Building Using A Fuzzy Controller, Fazel Naghdy, Mohammed Aldawod, Bijan Samali, Kenny Kwok
Professor Fazel Naghdy
No abstract provided.
Pointer States Via Engineered Dissipation, Kaveh Khodjasteh, Viatcheslav V. V. Dobrovitski, Lorenza Viola
Pointer States Via Engineered Dissipation, Kaveh Khodjasteh, Viatcheslav V. V. Dobrovitski, Lorenza Viola
Dartmouth Scholarship
Pointer states are long-lasting high-fidelity states in open quantum systems. We show how any pure state in a non-Markovian open quantum system can be made to behave as a pointer state by suitably engineering the coupling to the environment via open-loop periodic control. Engineered pointer states are constructed as approximate fixed points of the controlled open-system dynamics, in such a way that they are guaranteed to survive over a long time with a fidelity determined by the relative precision with which the dynamics is engineered. We provide quantitative minimum-fidelity bounds by identifying symmetry and ergodicity conditions that the decoherence-inducing perturbation …
Heterogeneity, Control, Social Infrastructure, And Possibilities Of Participation: Their Interplay In Modern Understandings Of Heredity And In Interpretation Of Science, Peter J. Taylor
Working Papers on Science in a Changing World
This working paper is a prospectus for research, writing, and engagement. It consists of vignettes, sketches of lines of inquiry, and proposals for engagement, all of which concern modern understandings of heredity and development over the life course as well as the social interpretation of science. The various items address a range of areas of science and of its interpretation: heritability studies, the social uses of genetic information, gene-by-environment interaction, personalized medicine, IQ paradoxes, racial group membership, biobanks, and life events and difficulties research. Fresh perspectives in these areas are opened up by examining the ways that research and application …
Limits On Preserving Quantum Coherence Using Multipulse Control, Kaveh Khodjasteh, Támas Erdélyi, Lorenza Viola
Limits On Preserving Quantum Coherence Using Multipulse Control, Kaveh Khodjasteh, Támas Erdélyi, Lorenza Viola
Dartmouth Scholarship
We explore the physical limits of pulsed dynamical decoupling methods for decoherence control as determined by finite timing resources. By focusing on a decohering qubit controlled by arbitrary sequences of π pulses, we establish a nonperturbative quantitative upper bound to the achievable coherence for specified maximum pulsing rate and noise spectral bandwidth. We introduce numerically optimized control “bandwidth-adapted” sequences that saturate the performance bound and show how they outperform existing sequences in a realistic excitonic-qubit system where timing constraints are significant. As a by-product, our analysis reinforces the impossibility of fault-tolerance accuracy thresholds for generic open quantum systems under purely …
Coherent-State Transfer Via Highly Mixed Quantum Spin Chains, Paola Cappellaro, Lorenza Viola, Chandrasekhar Ramanathan
Coherent-State Transfer Via Highly Mixed Quantum Spin Chains, Paola Cappellaro, Lorenza Viola, Chandrasekhar Ramanathan
Dartmouth Scholarship
Spin chains have been proposed as quantum wires in many quantum-information processing architectures. Coherent transmission of quantum information in spin chains over short distances is enabled by their internal dynamics, which drives the transport of single-spin excitations in perfectly polarized chains. Given the practical challenge of preparing the chain in a pure state, we propose to use a chain that is initially in the maximally mixed state. We compare the transport properties of pure and mixed-state chains and find similarities that enable the experimental study of pure-state transfer via mixed-state chains. We also demonstrate protocols for the perfect transfer of …
Application Of Microsimulation To Disease Transmission And Control, A Green, Y Zhang, I Piper, Daniel Keep
Application Of Microsimulation To Disease Transmission And Control, A Green, Y Zhang, I Piper, Daniel Keep
Faculty of Informatics - Papers (Archive)
In this paper, we present an extension of our novel microsimulation technique, as applied to biological infection spread, to estimate the underlying causal parameters driving an infectious process. The underlying simulation framework, Simulacron, was developed in order to understand the development and course of, response to and recovery from single and multiple threats on community populations. Such threats include a range of natural (such as disease spread in communities, fire, flood etc.) and manmade events (such as terrorism, including the use of biological agents, money laundering, smuggling as well as accidents etc.). These threats can cause serious disruption to modern …
Vibration Control Of Seat Considering Vehicle Suspension And Human-Body Models, Haiping Du, Weihua Li, Nong Zhang
Vibration Control Of Seat Considering Vehicle Suspension And Human-Body Models, Haiping Du, Weihua Li, Nong Zhang
Faculty of Informatics - Papers (Archive)
Vehicle seat suspension is one of very important components to provide ride comfort, in particular, commercial vehicles, to reduce driver fatigue due to long hours driving. This paper presents a study on active control of seat suspension to reduce vertical vibration transmitted from uneven road profile to driver body. The control problem will be firstly studied by proposing an integrated seat suspension model which includes vehicle chassis suspension, seat suspension, and driver body model. This is a new concept in the field of study because most of the current active and semi-active seat suspension studies only consider seat suspension or …
T-S Fuzzy H Tracking Control Of Input Delayed Robotic Manipulators, Haiping Du, Weihua Li
T-S Fuzzy H Tracking Control Of Input Delayed Robotic Manipulators, Haiping Du, Weihua Li
Faculty of Informatics - Papers (Archive)
Time delays are often encountered by practical control systems while they are acquiring, processing, communicating, and sending signals. Time delays may affect the system stability and degrade the control system performance if they are not properly dealt with. Taking the classical robot control problem as an example, the significant effect of time delay on the closed-loop system stability has been highlighted in the bilateral teleoperation, where the communication delay transmitted through a network medium has been received widespread attention and different approaches have been proposed to address this problem (Hokayem and Spong, 2006). In addition, examples like processing delays in …
Control Of Biodegradation Of A Mg Alloy In Simulated Body Fluid, Yafei Zhang, Maria Forsyth, Bruce Hinton, Gordon G. Wallace
Control Of Biodegradation Of A Mg Alloy In Simulated Body Fluid, Yafei Zhang, Maria Forsyth, Bruce Hinton, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
Mg alloy AZ31 is an attractive candidate for coronary artery stents, as it possesses excellent biocompatibility in human body and good mechanical properties. However, AZ31 magnesium alloys generally have poor corrosion resistance in the body environment. This paper reports on the early stages of an investigation into the corrosion mechanism and the morphology of corrosion of AZ31 in simulated body fluid (SBF), The investigation will also consider ways of improving corrosion resistance of this alloy in SBF through the use of ionic liquids. The results to date have shown that AZ31 suffers severe localized pitting corrosion in SBF. The pits …
A Case Study In Forensic Analysis Of Control, Fred Cohen
A Case Study In Forensic Analysis Of Control, Fred Cohen
Journal of Digital Forensics, Security and Law
This paper describes a case study in which a method for forensic analysis of control was applied to resolve probative technical issues in a legal action. It describes one instance in which the analysis was successfully applied without challenge, addresses the details of most of the different facets of the analysis method, and demonstrates how such analysis provides a systematic approach to using technical methods to address legal issues as a case study.