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Ekeberg, Dennis. "Corpus Technologica : En religionshistorisk analys av Robert Anton Wilsons version av The Eight Circuit Model of Consciousness i ljuset av den västerländska esoterismen". Thesis, Södertörns högskola, Institutionen för historia och samtidsstudier, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-18590.
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This is a thesis about The Eight Circuit Model, a modern mind map developed for the purpose of illumination and enlighenment by Dr. Timothy Leary in the 1970s. Later, authors such as Robert Anton Wilson and Antero Alli elaborated upon the idea to make it more wholesome and compatible with other ideas expressing the same basic principle. In short, it is an intellectual abstraction of the evolution of consciousness through a series of eight stages, which Leary called Circuits. By looking at the brain as an evolving bio-computer, with thoughts working as software, upgrading itself through neurological imprints, Learys created a Hero's Journey for the modern age.The thesis tries to analyze this idea, as it is presented in Robert Anton Wilsons Prometheus Rising, through the lens of the discourse category ”Western Esoterism.” A hard-to-define subject but described as ”the dialectic of the hidden and the revealed in the field of religion.”
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Jordan, Stephen Paul. "Quantum computation beyond the circuit model". Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/45448.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2008.Includes bibliographical references (p. 133-144).
The quantum circuit model is the most widely used model of quantum computation. It provides both a framework for formulating quantum algorithms and an architecture for the physical construction of quantum computers. However, several other models of quantum computation exist which provide useful alternative frameworks for both discovering new quantum algorithms and devising new physical implementations of quantum computers. In this thesis, I first present necessary background material for a general physics audience and discuss existing models of quantum computation. Then, I present three new results relating to various models of quantum computation: a scheme for improving the intrinsic fault tolerance of adiabatic quantum computers using quantum error detecting codes, a proof that a certain problem of estimating Jones polynomials is complete for the one clean qubit complexity class, and a generalization of perturbative gadgets which allows k-body interactions to be directly simulated using 2-body interactions. Lastly, I discuss general principles regarding quantum computation that I learned in the course of my research, and using these principles I propose directions for future research.
by Stephen Paul Jordan.
Ph.D.
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Nguyen, An. "Mathematical model of competence regulation circuit". Thesis, University of Southampton, 2014. https://eprints.soton.ac.uk/374173/.
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Gene expression regulatory networks are molecular networks which describe interactions among gene products in terms of biochemical reactions. This helps us understand the molecular mechanisms underlying important biological processes as well as cell functioning as a whole. For instance, the phenomenon of bacterial competence, whereby a bacterium enters a transiently differentiated state, incorporating DNA fragments from its environment into its genome, has been studied with the help of such gene regulatory circuits (Suel et al., 2006; Maamar and Dubnau, 2005). As a result, a genetic circuit has been taken into account in order to describe the transition from a vegetative state to a transient state of competence and vice versa. In this work, we are going to study a genetic circuit presented by Suel et al. (2007) to describe this dynamical behaviour. The authors introduce model reduction techniques to study the behaviour of stochastic chemical system of X species by means of an adiabatic two dimensional model. While the adiabatic model helps us understand about the dynamics near the steady state, it gives an incorrect description of the time-scales of the competent state. For this reason, it is necessary to build up a model which better describes the system realistically. In the thesis, I propose an approximate two-dimensional model of the full high-dimensional system and from that, the dynamics of the system can be simulated more accurately compared to that of Suel et al. (2007). I then show how to put the noise back into the approximate model to be able come up with a stochastic model which can mathematically describe the dynamical behaviour of the original high dimensional system. I also found out that the evolution of the system is not well approximated by a Langevin process. This leads to a gap between the real behavior which is described by Gillespie's stochastic simulation and the Langevin approximation. To overcome this, I have fixed the stochastic Langevin model by incorporating empirically tunable noise into the model so as to obtain a similar behaviour as observed in the original system. I also introduce the chemical Fokker-Planck equation aimed to estimate the probability density function of species concentrations which are involved in the biochemical system.
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Silveira, Luís Miguel. "Model order reduction techniques for circuit simulation". Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/36451.
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Usher, N. B. "Quantum computation beyond the unitary circuit model". Thesis, University College London (University of London), 2017. http://discovery.ucl.ac.uk/1559869/.
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This thesis considers various paradigms of quantum computation in an attempt to understand the nature of the underlying physics. A standard approach is to consider unitary computation on pure input states, such that the outcome of the computation is determined by single computational basis measurement on the output state. It has been shown that there exists equivalent models of computation, such as measurement based quantum computing (MBQC), which provide insight into the role of entanglement and measurement. Furthermore, constraining or relaxing available resources can directly impacts the power of the computation, allowing one to gauge their role in the process. Here, we first extend known constructions such as Matrix Product States, MBQC and the oneclean qubit model to a mixed state formalism, in an attempt to develop computational models where noise acting on the physical resources, as might be experienced in laboratory settings, may be mapped to logical noise on the computation. Next, we introduce Measurement-Based Classical Computing, an essentially classical model of computation, wherein the complexity hard wired into probability distributions generated via quantum means yields surprising non classical results. Finally, we consider postselection the ability to discard displeasing measurement outcomes and argue that it may be used in a tame way, which does not provide a dramatic increase in computational power. From here, we develop a new Hamiltonian, based on a circuit to Hamiltonian construction, presenting evidence of QMA-hardness.
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Wicks, Kenneth. "A dynamic circuit-based model for ferromagnetic materials". Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/614.
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In recent years there has been increased interest in the development of sensorless switched reluctance machine drives. The proper operation of a switched reluctance machine (SRM) requires knowledge of the position of the rotor of the machine. The inclusion of a physical position sensor compromises the inherent robustness of this type of machine. Thus, there has been a need to develop techniques to estimate the position of the rotor in SRM drives.
Switched reluctance machines are able to operate over a large range in speed. A fully loaded SRM is typically designed to saturate the ferromagnetic material that comprises the stator and rotor of the machine whereas a lightly loaded machine does not. Therefore, the model of the machine should be able to handle both a large range in frequency and input excitation levels of the magnetic material in the machine.
The development of a new dynamic circuit-based ferromagnetic model is described in this thesis. The investigation of the behaviour of 24 gauge M19 silicon steel led to the conclusion that, for this material, a circuit model that has static parameters is unable to accurately reproduce the behaviour of the actual material over a large range of input frequencies and excitation levels without resorting to retuning the parameters of the model.
This thesis provides two new mechanisms that dynamically adjust the resistance values of the flux tubes of the model. Comparisons using a normalized vertical least-squares metric between the newly proposed dynamic model and a model that has static resistance values clearly show the improvement that is gained by using these mechanisms.
A practical implementation of the new model is also given. Timing using a general purpose CPU shows that this implementation of the model will most likely be able to be used as part of a multi-phase lumped parameter model for a SRM in realtime.
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Hu, Bo. "Model compiler driven device modeling and circuit simulation /". Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/6054.
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Ren, Shengru. "A nonlinear circuit model for lithium-ion batteries". Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/45621.
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Magampa, Agnes Randy Mmakotsedi. "The academic performance of orphaned primary school learners aged between eight and ten years in Mankweng Circuit : Limpopo Province". Thesis, University of Limpopo (Turfloop Campus), 2014. http://hdl.handle.net/10386/1371.
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Thesis (M.A. ( Research Psychology)) --University of Limpopo, 2014The study investigated the academic performance of orphaned primary school learners between the ages of eight and ten in Mankweng circuit. The study used both quantitative and qualitative methods. The quantitative component of the study included the sampling of 200 learners from ten schools in Mankweng circuit. One hundred learners formed the experimental group (orphans) whilst another hundred were placed in the comparison group (non-orphans). Availability and quota sampling was used for sampling the experimental group and simple random sampling was used to sample the comparison group. Four learning areas chosen for the study include Sepedi, Numeracy, English and Lifeskills. In all learning areas, it was found that the comparison group fell within level 2 (50-69) area whilst the experimental group fell within level 1 (0-49) area suggesting that the comparison group is performing better than the experimental group. The qualitative component of the study involved sampling ten educators from ten sampled primary schools in Mankweng Circuit, i.e. one educator per school. The main theme that emerged from these transcripts was the educators’ view that orphaned children tend to perform poorly at school when compared to non-orphaned children. Furthermore, the educators were of the view that orphaned children are more likely to show poor grades, lack of concentration and inability to write schoolwork when compared to non-orphans. The educators were also of the view that orphaned children were more likely to display behavioural and emotional problems when compared to non-orphans. Educators also suggested that guardians of orphaned learners are not coping well, and as such, are unable to adequately attend to the needs of these children. In conclusion, interventions at school, government as well as community levels are suggested. A suggestion is also made regarding the support that should be provided for grandparents (guardians) who tend to be drained as a result of having to look after orphaned children.
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Busuioc, Dan. "Circuit Model Parameter Extraction and Optimization for Microwave Filters". Thesis, University of Waterloo, 2002. http://hdl.handle.net/10012/804.
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This thesis presents a method for parameter extraction of circuit elements from microwave filters. This diagnosis method can be applied to a sufficiently large number of filters and it can also be used in conjunction with a neural network model for filter design, greatly reducing development time. This thesis is an introduction of parameter extraction and circuit modelling through use of neural networks. It also presents an implementation of the proposed method as well as numerical results and validation data. Detailed implementation code is presented in the appendix.
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Jones, Randolph D. "Circuit model of a low-voltage field emission cathode". Diss., Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/15631.
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Yigletu, Fetene Mulugeta. "Physics-based compact model of HEMTs for circuit simulation". Doctoral thesis, Universitat Rovira i Virgili, 2014. http://hdl.handle.net/10803/293908.
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Aquesta tesi adreça el modelatge de dispositius HEMTs. Es presenta un model compacte, de base física, d’ AlGaN/GaN HEMTs per a la simulación de circuits. Es desenvolupa un model complet del corrent de drenador, i de les càrregues i capacitàncies de porta. El model bàsic de corrent de drenador i càrregues de porta s’obté usant un model simple de control de càrrega desenvolupat a partir de les solucions de les equacions de Poisson i Schrödinger per a l’àrea activa d’operació del dispositiu. Es presenta també un model separat del col•lapse del corrent, que és un efecte important en els AlGaN/GaN HEMT. El model de col•lapse del corrent es desenvolupa emprant el model bàsic de model com a marc, la qual cosa resulta en un model robust de gran senyal que pot ser utilitzat amb i sense la presència del col•lapse del corrent. A més, es presenta una anàlisi de no linearitats i modelatge de AlGaAs/GaAs pHEMT utilitzant les sèries de Volterra.This thesis targets the modeling of III-V HEMTs devices. A physics-based compact modeling of AlGaN/GaN HEMTs for circuit simulation is presented. A complete modeling of drain current, gate charge and gate capacitances is developed. The core drain current and gate charge models are derived using a simple charge control model developed from the solutions of Poisson's equation and Schrödinger’s equation solved for the active operating area of the device. The models are simple continuous and applicable for the whole operating regime of the device. A separate model is also presented for the current collapse effect, which is a serious issue in AlGaN/GaN HEMT. The current collapse model is developed using the core current model as a framework which resulted in a robust large signal model that can be used with and without the presence of current collapse. In addition, nonlinearity analysis and modeling of commercial AlGaAs/GaAs pHEMTs using the Volterra series is also presented.
Esta tesis trata el modelado de dispositivos III-V HEMTs. Se presenta un modelo compacto, de base física, de AlGaN/GaN HEMTs para la simulación de circuitos. Se desarrolla un modelo completo de la corriente de drenador, y de cargas y capacitancias de puerta. El modelo básico de corriente de drenador y cargas de puerta se obtiene usando un modelo simple de control de carga desarrollado a partir de las soluciones de la ecuación de Poisson y Schrödinger para el área activa de operación del dispositivo. Se presenta también un modelo separado del colapso de la corriente, que es un efecto importante en AlGaN/GaN HEMT. El modelo de colapso de corriente de desarrolla empleando el modelo básico de corriente como marco, lo cual resulta en un modelo robusto de gran señal que puede ser utilizado con y sin la presencia del colapso de corriente. Además, se presenta un análisis de no linealidades y modelado de AlGaAs/GaAs pHEMT utilizando las series de Volterra.
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Humphrey, Dave. "Equivalent circuit model of a prestressed concrete pressure pipe". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0004/MQ42634.pdf.
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Jesser, Alexander. "Mixed signal circuit verification using symbolic model checking techniques". München Verl. Dr. Hut, 2008. http://d-nb.info/992162858/04.
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Bagheri, Rajeoni Alireza. "ANALOG CIRCUIT SIZING USING MACHINE LEARNING BASED TRANSISTORCIRCUIT MODEL". University of Akron / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=akron1609428170125214.
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Edwards, Robert Paul. "Expert system control of a flotation circuit". Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/29600.
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Expert systems technology is a discipline of artificial intelligence that has recently emerged from the research environment and is currently making significant inroads into business and industry. The proponents of expert systems make many attractive claims. Two of the claims are that expert systems can capture the knowledge of the experts and can be programmed by non-programmers. To date, most uses of this technology in the process industry are in off-line applications, that is, applications that are not directly tied to operating environments. Moreover, those that are used in on-line environments are used as advisors and only suggest changes, human operators are required to close-the-loop to the process. This technology should be applicable to operating environments and should the claims of its proponents be valid, then it should also be better than existing tools currently in use. In an operating environment it could use the knowledge of experienced operators as an intelligent controller and apply it directly to a process without the intervention of human operators.
In this thesis the prospect of using an expert system as an intelligent controller is investigated. The thesis offers background to expert systems, how expert systems are related to artificial intelligence and what the generic components of an expert system are. As a test of the technology an expert system was developed as an intelligent controller in a mineral processing application. The prototype expert system was developed as a supervisory controller in the copper flotation circuit in the concentrator at Brenda Mines Ltd..
The expert system operated on-line and controlled the process in real-time. It read sensor data and using the operating experience of Brenda's flotation
operators, manipulated regulatory controller setpoints as deemed necessary. The expert system was able to manipulate directly reagent flowrates and process air flowrates. Also, it suggested changes to other process variables not directly under its control. The manipulated variables were collector and frother reagent flowrates, the air flowrate to a bank of scavenger flotation cells and the air flowrate to four flotation columns. The operators were allowed to, and sometimes required to, intervene in instances of large process upsets. Results of a month long trial period in the flotation circuit indicated the success of the application. The expert system was indeed able to maintain metallurgical performance at a level approximating that of the operating experts, however, no direct comparison between the performance of the circuit under expert system control, versus performance under operator control, was possible. A rudimentary comparison was made between the circuit's performance under expert system control and its historic performance. The results were favourable. A less tangible measure, though as important, were the attitudes of the operators toward the system. Almost unanimously, the operators felt the system eased the task of circuit operation and was responsible for better circuit performance.Applied Science, Faculty of
Mining Engineering, Keevil Institute of
Graduate
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Hirtle, Sean T. "EIGHT DEGREE OF FREEDOM VEHICLE MODEL WITH PITCH, YAW, TIRE CONTROL AND SENSOR INPUTS". DigitalCommons@CalPoly, 2015. https://digitalcommons.calpoly.edu/theses/1360.
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This research focuses on the development of an eight degree of freedom vehicle model in the MATLAB computing language. Its purpose is to provide flexibility in the modeling and implementation of signal inputs and crash avoidance logic while maintaining accuracy in the physics of the vehicle’s motion. Firstly, the equations of motion for the bodies involved under a reasonable set of assumptions were developed. Next the model was translated to computer code. By writing the model in SimuLink with *.m files, the modularity of the code is enhanced. To validate the model, several well defined tests were simulated.
To establish some form of credibility, the solutions from this model were compared against three independent solution sets. Three different visual correlates were noted: dynamic response, steady state accuracy, and tendency to oscillate in the high frequency domain. The dynamic response of the model was shown to agree with the empirically measured results. Some steady state accuracy arguments were presented, with focus on further development of the tire model. Future research into other finite difference methods were also given.
Regarding three dimensional kinematics, it should be mentioned that this model uses the simplest approximation to a set of partial differential equations allowable, which gives it some form of presentability in the classroom. The method is comprehensible to even the most amateur computational physicist. For the tests presented, this approximation is convergent, and highlights the efficacy of residual methodologies.
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San, Pedro Martín Javier de. "Structure discovery techniques for circuit design and process model visualization". Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/461196.
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Graphs are one of the most used abstractions in many knowledge fields because of the easy and flexibility by which graphs can represent relationships between objects. The pervasiveness of graphs in many disciplines means that huge amounts
of data are available in graph form, allowing many opportunities for the extraction of useful structure from these graphs in order to produce insight into the data.
In this thesis we introduce a series of techniques to resolve well-known challenges in the areas of digital circuit design and process mining. The underlying idea that ties all the approaches together is discovering structures in graphs. We show how many problems of practical importance in these areas can be solved utilizing both common and novel structure mining approaches.
In the area of digital circuit design, this thesis proposes automatically discovering frequent, repetitive structures in a circuit netlist in order to improve the quality of physical planning. These structures can be used during floorplanning to produce regular designs, which are known to be highly efficient and economical. At the same time, detecting these repeating structures can exponentially reduce the total design time.
The second focus of this thesis is in the area of the visualization of process models. Process mining is a recent area of research which centers on studying the behavior of real-life systems and their interactions with the environment. Complicated process models, however, hamper this goal. By discovering the important structures in these models, we propose a series of methods that can derive visualization-friendly process models with minimal loss in accuracy.
In addition, and combining the areas of circuit design and process mining, this thesis opens the area of specification mining in asynchronous circuits. Instead of the usual design flow, which involves synthesizing circuits from
specifications, our proposal discovers specifications from implemented circuits. This area allows for many opportunities for verification and re-synthesis of asynchronous circuits.
The proposed methods have been tested using real-life benchmarks, and the quality of the results compared to the state-of-the-art.Els grafs són una de les representacions abstractes més comuns en molts camps de recerca, gràcies a la facilitat i flexibilitat amb la que poden representar relacions entre objectes. Aquesta popularitat fa que una gran quantitat de dades es puguin trobar en forma de graf, i obre moltes oportunitats per a extreure estructures d'aquest grafs, útils per tal de donar una intuïció millor de les dades subjacents. En aquesta tesi introduïm una sèrie de tècniques per resoldre reptes habitualment trobats en les àrees de disseny de circuits digitals i mineria de processos industrials. La idea comú sota tots els mètodes proposats es descobrir automàticament estructures en grafs. En la tesi es mostra que molts problemes trobats a la pràctica en aquestes àrees poden ser resolts utilitzant nous mètodes de descobriment d'estructures. En l'àrea de disseny de circuits, proposem descobrir, automàticament, estructures freqüents i repetitives en les definicions del circuit per tal de millorar la qualitat de les etapes posteriors de planificació física. Les estructures descobertes poden fer-se servir durant la planificació per produir dissenys regulars, que son molt més econòmics d'implementar. Al mateix temps, la descoberta i ús d'aquestes estructures pot reduir exponencialment el temps total de disseny. El segon punt focal d'aquesta tesi és en l'àrea de la visualització de models de processos industrials. La mineria de processos industrials es un tema jove de recerca que es centra en estudiar el comportament de sistemes reals i les interaccions d'aquests sistemes amb l'entorn. No obstant, quan d'aquest anàlisi s'obtenen models massa complexos visualment, l'estudi n'és problemàtic. Proposem una sèrie de mètodes que, gràcies al descobriment automàtic de les estructures més importants, poden generar models molt més fàcils de visualitzar que encara descriuen el comportament del sistema amb gran precisió. Combinant les àrees de disseny de circuits i mineria de processos, aquesta tesi també obre un nou tema de recerca: la mineria d'especificacions per circuits asíncrons. En l'estil de disseny asíncron habitual, sintetitzadors automàtics generen circuits a partir de les especificacions. En aquesta tesi proposem el pas invers: descobrir automàticament les especificacions de circuits ja implementats. Així, creem noves oportunitats per a la verificació i la re-síntesi de circuits asíncrons. Els mètodes proposats en aquesta tesi s'han validat fent servir dades obtingudes d'aplicacions pràctiques, i en comparem els resultats amb els mètodes existents.
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Zhan, Song. "A development gene regulation network model for Electronic Circuit design". Thesis, University of York, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.516396.
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Machete, R. L. "Modelling a Moore-Spiegel Electronic Circuit : the imperfect model scenario". Thesis, University of Oxford, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.445775.
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The goal of this thesis is to investigate model imperfection in the context of forecasting. We focus on an electronic circuit built in a laboratory and then enclosed to reduce environmental effects. The non-dimensionalised model equations, obtained by applying Kirchhoff’s current and voltage laws, are the Moore-Spiegel Equations [47], but they exhibit a large disparity with the circuit. At parameter values used in the circuit, they yield a periodic trajectory whilst the circuit exhibits chaotic behaviour. Therefore, alternative models for the circuit are sought. The models we consider are local and global prediction models constructed from data. We acknowledge that all our models have errors and then seek to quantify how these errors are distributed across the circuit attractor. To this end, q-pling times of initial uncertainties are computed for the various models. A q-pling time is the time for an initial uncertainty to increase by a factor of q [67], where q is a real number. Whereas it is expected that different models should have different q-pling time distributions, it is found that the diversity in our models can be increased by constructing them in different coordinate spaces. To forecast the future dynamics of the circuit using any of the models, we make probabilistic forecasts [8]. The question of how to choose the spread of the initial ensemble is addressed by the use of skill scores [8, 9]. Finally, the diversity in our models is exploited by combining probabilistic forecasts from them so as to minimise some skill score. It is found that the skill of combined not-so-good models can be increased by combining them as discussed in this thesis.
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Morua, Michael L. "A Circuit Model for an Inductive Strip in Homogeneous Finline". Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA238001.
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Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, June 1990.Thesis Advisor(s): Knorr, Jeffrey B. Second Reader: Janaswamy, R. "June 1990." Description based on title screen as viewed on October 19, 2009. DTIC Indicator(s): Homogeneous finlines, Inductive strips, Theses, Program listings. Author(s) subject terms: Finline, Discontinuity, Inductive, Strip. Includes bibliographical references (p. 98). Also available online.
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Yan, Yingyi. "Equivalent Circuit Model for Current Mode Controls and Its Extensions". Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/50485.
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Current-mode control architectures have been an indispensable technique in many applications, such as Voltage Regulator, Point-of-load converters, power factor correction, battery charger and LED driver. Since the inductor current ramp is used in the modulator in current-mode control without any low pass filter, high order harmonics play important role in the feedback control. This is the reason for the difficulty in obtaining the small-signal model for current-mode control in the frequency domain. A continuous time domain model was recently proposed as a successful model for current-mode control architectures. However, the model was derived by describing function method, which is very arithmatically complicated, not to mention time consuming.For the analysis and design of non-linear system, equivalent circuit model, which is user friendly and intuitive, is an effective tool. In this dissertation, the primary objective is to develop a unified three-terminal switch model for current-mode controls using the results of describing function derivation, which characterizes the small signal property of the common subcircuit of current mode controlled PWM converters. Its application is extended to average current mode control, V2 control and other proposed novel current mode control schemes.
First, the existing model for current mode control is reviewed. The limitations of exsiting model for current-mode control are identified. Based on the universal small signal relationship between terminal currents and the results of describing function derivation, a unified three-terminal switch model for current mode control is proposed. A three-terminal equivalent circuit is developed to represent the small signal behavior of this common sub-circuit. The proposed model is applicable in both constant frequency and variable frequency modulation.
After that, the modeling of digital predictive current mode control is presented. Predictive current mode control is one of the promising digital current mode control method featuring fast dynamic response and low sample rate requirement. Many implementations were presented in past ten years. To understand the benefit and the limitation of each implementation, help the engineer to choose the modulation scheme and design the control loop, a small signal Laplace-domain model for digital predictive current mode controls is proposed. The model is extended to the multi-sampled implementation. The modeling result is summarize as the small signal equivalent circuit mode, whose form is consistant with that of analog current mode controls. Based on S-domain model, digital predictive current mode controls are compared with analog implementation to demonstrate the advantages and limitation. Implementation selection guideline and compensation is discussed based on the modeling results.
Then, using the proposed unified model is used in the analysis of average current mode control. Under proper design, the inductor current ripple passes through the current compensator and appears in PWM comparator. It significantly influence the high frequency small signal property of the converter. In chapter 3, the proportional feedback is separated from integral feedback so that the sideband frequency feedback effect can be taken into consideration. It extends the results obtained in peak-current model control to average current mode control. The proposed small signal model is accurate up to half switching frequency, predicting the sub-harmonic instability. Based on the proposed model, a new feedback design guideline is proposed. By designing the external ramp following the proposed design guideline, quality factor of the double poles at half of switching frequency in control-to-output transfer function can be precisely controlled. This helps the feedback design to achieve widest control bandwidth and proper damping.
V2 control is a popular control scheme in Point-of-load converters due to the unique fast transient response. As the output voltage ripple is used as PWM modulation ramp, V2 control has close relationship with current mode control but this relationship was not addressed in the exsiting model. Chapter 4 utilizes the three-terminal switch model to build the equivalent circuit model for V2 control, which clearly shows that V2 control is a particular implementation of current mode control, with proportional capacitor voltage feedback and load current feedback embeded.
The analysis presented in Chapter 3 provides a clear physical understanding of average current mode control. With constant frequency modulation, the control bandwidth is usually limited by the double pole at half of swithcing frequency, especially in the converters with wide duty cycle range. Chapter 5 proposed a novel I2 current mode control to improve the dynamic performance of average current mode control. In particular, constant on-time I2 control eliminates the need of external ramp while the current loop is inherently stable. Moreover, constant on-time modulation improves the light load efficiency.
As a conclusion, this dissertation proposed a unified three-terminal switch model for current mode controls. The application of this equivalent circuit model is extended to average current mode control, V2 control and the novel I2 current mode control. The Laplace-domain model of predictive current mode control is also presented. All the modeling results are verified through simulation and experiments.
Ph. D.
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Tian, Shuilin. "Equivalent Circuit Model of High Frequency PWM and Resonant Converters". Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/56676.
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Distributed power system (DPS) is widely adopted in Power supplies for the telecom, computer and network applications. Constant on-time current mode control and V2 control are widely used as point-of-load (POL) converters and voltage regulators (VR) in DPS systems. Series resonant converters (SRC) are widely used in aerospace systems and LLC resonant converters are widely used as Front-end converters in DPS systems. The technological innovations bring increasing demand for optimizing the dynamic performance of the switching regulators in these applications. There has been a strong desire to develop simple and accurate equivalent circuit models to facilitate the design of these converters.
Constant on-time current-mode control has been widely used in POL and VRM converters. For multi-phase application, external ramp is required to improve jittering performance using pulse distribution method. Chapter II analyzes the effect of external ramp on small-signal model of constant on-time current mode control. It is found that external ramp brings additional dynamics by introducing a moving pole and a static zero. Next, a three-terminal switch model is proposed based on non-ideal current source concept, where the non-idealness of the current source is presented by a Re2-Le2 branch. Based on the proposed model, design guidelines are proposed based on either worst case design strategy or auto-tuning strategy.
V2 control has advantages of simple implementation and fast transient response and is widely used in industry for POL and VR applications. However, the capacitor voltage sideband effect, which casues the instability problem when ceramic capacitors are employed, also needs to be taken into consideration in modeling. Chapter III proposed a unified equivalent circuit model of V2 control, the model is built based on non-ideal voltage source concept. The model represents capacitor voltage sideband effect with a Re2-Le2 branch, which forms the double pole by resonating with power stage output capacitor. The equivalent circuit model is a complete model and can be used to examine all the transfer functions. Bsed on the unified equivalent circuit model, design guidelines for VR applications and general POL applications are provided in Chapter IV, for both constant on-time V2 control and constant frequency V2 control.
For resonant converters, the small-sginal modelling is very challenging as some of the state variables do not have dc components but contain strong switching frequency component and therefore the average concept breaks down. For SRC, the equivalent circuit model proposed by E. Yang in [E26] based on the results by the extended describing function concept is the most successful model. However, the order of the equivalent circuit model is too high and the transfer functions are still derived based on numerical solution instead of analytical solutions. Chapter V proposes a methodology to simplify the fifth-order equivalent circuit of SRC to a third-order equivalent circuit. The proposed equivalent circuit model can be used to explain the beat frequency dynamics: when switching frequency is far away from resonant frequency, beat frequency will occur; when the two frequencies are close, beat frequency will disappear and another double pole which is determined by equivalent inductor and output capacitor will be formed. For the first time, analytical solutions are provided for all the transfer functions which are very helpful for feedback design.
LLC resonant converters are widely adopted as front-end converter in distributed power system for the telecom, computer and network applications [F2]. Besides, LLC resonant converters are also very popular in other applications, such as LCD, LED and plasma display in TV and flat panels [F3]-[F6]; iron implanter arc power supply[F7]; solar array simulator in photovoltaic application[F8]; fuel cell applications[F9],and so on. For LLC, no simple equivalent circuit model is available and no analytical expressions of transfer functions are presented. Chapter VI proposes an equivalent circuit model for LLC resonant converter. When Fs ≥ Fo, Lm is clamped by the output voltage and LLC behaves very similar as SRC. As a result, the dynamic behavior is similar as SRC: when switching frequency is larger than resonant frequency, the beat frequency double pole show up and the circuit is third-order; when switching frequency is close to resonant frequency, beat frequency double pole disappear and a new double pole formed by equivalent inductor Le and equivalent output capacitor Cf show up. The circuit reduces to second order. When Fs
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Otero-Forero, Andres. "Psychometric properties of the sport motivation scale : an analysis of the original model, a modified seven-factor model and an eight-factor model /". [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18512.pdf.
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Crampton, Raymond J. "A nonlinear statistical MESFET model using low order statistics of equivalent circuit model parameter sets". Thesis, This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-03032009-040420/.
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Angel, Nathan A. "EQUIVALENT CIRCUIT IMPLEMENTATION OF DEMYELINATED HUMAN NEURON IN SPICE". DigitalCommons@CalPoly, 2011. https://digitalcommons.calpoly.edu/theses/611.
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This work focuses on modeling a demyelinated Hodgkin and Huxley (HH) neuron with Simulated Program with Integrated Circuit Emphasis (SPICE) platform. Demyelinating disorders affect over 350,000 people in the U.S and understanding the demyelination process at the cellular level is necessary to find safe ways to treat the diseases [9]. Utilizing a previous SPICE model of an electrically small cell neuron developed by Szlavik [32], an extended core conductor myelinated neuron was produced in this work. The myelinated neuron developed has seven active Nodes of Ranvier (nodes) separated by a myelin sheath. The myelin sheath can be successfully modeled with a resistive and capacitive network known as internodes. Both the Nodes of Ranvier and internode equivalent circuits were implemented in P-SPICE sub-circuit library files. Properties of the neuron can be changed in the library files to simulate neurons of different electrical or geometric properties. Using the P-SPICE code developed in this work, a myelinated neuron’s action potential was simulated and the action potential at each node was recorded. The action potential at each node was uniform in amplitude and pulse width. The conduction velocity of the action potential was calculated to be 57.15 m/s.
Demyelination can be modeled by decreasing the capacitance and increasing the resistance of the myelin [34]. Two demyelinated neuron models were simulated in this work. The first model had one internode segment demyelinated, and the second model was of three consecutive internode segments. The resulting conduction velocity was calculated for both simulations. For one and three internode segment demyelinated the conduction velocity was slowed to 44.15 m/s, and 27.15 m/s respectively. This model successfully showed that an HH neuron implemented in SPICE could show the effects of demyelination on conduction velocity
The goal of this work is to develop a demyelinated neuron so that treatments for Multiple Sclerosis (MS) and other demyelinated neurons could be simulated to test various treatments’ effectiveness. A current treatment for MS is ion channel blockers. Future work would be to use this model to test current ion channel blocker therapy and to validate if such therapies alleviate conduction slowing.
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Courey, Karim Joseph. "An Investigation of the Electrical Short Circuit Characteristics of Tin Whiskers". Scholarly Repository, 2008. http://scholarlyrepository.miami.edu/oa_dissertations/38.
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Existing risk simulations make the assumption that when a free tin whisker has bridged two adjacent exposed electrical conductors, the result is an electrical short circuit. This conservative assumption is made because shorting is a random event that has a currently unknown probability associated with it. Due to contact resistance electrical shorts may not occur at lower voltage levels. In these experiments, the effect of varying voltage on the breakdown of the contact resistance which leads to a short circuit was studied. From this data, the probability of an electrical short was estimated, as a function of voltage, given that a free tin whisker has bridged two adjacent exposed electrical conductors. Also, three tin whiskers grown from the same Space Shuttle Orbiter card guide used in the aforementioned experiment were cross-sectioned and studied using a focused ion beam (FIB). The rare polycrystalline structure seen in the FIB cross section was confirmed using transmission electron microscopy (TEM). The FIB was also used to cross section two card guides to facilitate the measurement of the grain size of each card guide's tin plating to determine its finish.
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Hijazi, Abdallah. "Implementation of harmonic balance reduce model order equation". Thesis, Limoges, 2015. http://www.theses.fr/2015LIMO0139/document.
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MOR (Model Order Reduction) est devenu un domaine très répondu dans la recherche grâce à l'intérêt qu'il peut apporter dans la réduction des systèmes, ce qui permet d'économiser du temps, de la mémoire et le coût de CPU pour les outils de CAO. Ce domaine contient principalement deux branches: linéaires et non linéaires. MOR linéaire est un domaine mature avec des techniques numériques bien établie et bien connus dans la domaine de la recherche, par contre le domaine non linéaire reste vague, et jusqu'à présent il n'a pas montré des bons résultats dans la simulation des circuits électriques. La recherche est toujours en cours dans ce domaine, en raison de l’intérêt qu'il peut fournir aux simulateurs contemporains, surtout avec la croissance des puces électroniques en termes de taille et de complexité, et les exigences industrielles vers l'intégration des systèmes sur la même puce.Une contribution significative, pour résoudre le problème de Harmonic Balance (Equilibrage Harmonique) en utilisant la technique MOR, a été proposé en 2002 par E. Gad et M. Nakhla. La technique a montré une réduction substantielle de la dimension du système, tout en préservant, en sortie, la précision de l'analyse en régime permanent. Cette méthode de MOR utilise la technique de projection par l'intermédiaire de Krylov, et il préserve la passivité du système. Cependant, il souffre de quelques limitations importantes dans la construction de la matrice “pre-conditioner“ qui permettrait de réduire le système. La limitation principale est la nécessité d'une factorisation explicite comme une suite numérique de l'équation des dispositifs non linéaires . cette limitation rend la technique difficile à appliquer dans les conditions générales d'un simulateur. Cette thèse examinera les aspects non linéaires du modèle de réduction pour les équations de bilan harmoniques, et il étudiera les solutions pour surmonter les limitations mentionnées ci-dessus, en particulier en utilisant des approches de dérivateur numériquesMOR recently became a well-known research field, due to the interest that it shows in reducing the system, which saves time, memory, and CPU cost for CAD tools. This field contains two branches, linear and nonlinear MOR, the linear MOR is a mature domain with well-established theory and numerical techniques. Meanwhile, nonlinear MOR domain is still stammering, and so far it didn’t show good and successful results in electrical circuit simulation. Some improvements however started to pop-up recently, and research is still going on this field because of the help that it can give to the contemporary simulators, especially with the growth of the electronic chips in terms of size and complexity due to industrial demands towards integrating systems on the same chip. A significant contribution in the MOR technique of HB solution has been proposed a decade ago by E. Gad and M. Nakhla. The technique has shown to provide a substantial system dimension reduction while preserving the precision of the output in steady state analysis. This MOR method uses the technique of projection via Krylov, and it preserves the passivity of the system. However, it suffers a number of important limitations in the construction of the pre-conditioner matrix which is ought to reduce the system. The main limitation is the necessity for explicit factorization as a power series of the equation of the nonlinear devices. This makes the technique difficult to apply in general purpose simulator conditions. This thesis will review the aspects of the nonlinear model order reduction technique for harmonic balance equations, and it will study solutions to overcome the above mentioned limitations, in particular using numerical differentiation approaches
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Suwanasri, Thanapong. "Investigation on no load mechanical endurance and electrical degradation of a circuit breaker model under short circuit current interruption". [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=979106028.
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Takagi, Kentaro, Ichiro Jikuya, Gou Nishida, Maschke Bernhard y Kinji Asaka. "A study on the discretization of a distributed RC circuit model". IEEE, 2008. http://hdl.handle.net/2237/13888.
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Shina, Sammy G. "A design quality and cost model for printed circuit board assembly /". Thesis, Connect to Dissertations & Theses @ Tufts University, 1998.
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Thesis (Ph.D.)--Tufts University, 1998.Adviser: Anil Saigal. Submitted to the Dept. of Mechanical Engineering. Includes bibliographical references. Access restricted to members of the Tufts University community. Also available via the World Wide Web;
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Miller, Gregory A. "A circuit model for two-path cutoff waveguide dielectric resonator filters". Thesis, Monterey, Calif. : Naval Postgraduate School, 1992. http://handle.dtic.mil/100.2/ADA247785.
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Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, March 1992.Thesis Advisor: Knorr, Jeffrey B. "March 1992." Includes bibliographical references (p. 58-59). Also available in print.
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Danielsson, Christer. "Analysis of Synchronous machine dynamics using a novel equivalent circuit model". Licentiate thesis, Stockholm : Skolan för elektro- och systemteknik, Kungliga Tekniska högskolan, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10510.
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Lim, Eugene J. (Eugene Jungsud) 1980. "An engineering model of lower thalamo-cortico-basal ganglionic circuit function". Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/28458.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2003.Includes bibliographical references (leaves 59-60).
An engineering model of lower thalamo-cortico-basal ganglionic circuit functionality was extended and tested. This model attempts to explain the circuitry of the basal ganglia, examine its functional properties, and integrate these properties into an understanding of the diseases of the basal ganglia, such as Parkinson's disease and Huntington's disease. Using this model, simulations of various movements were developed, specifically those of the following: 1) one-step, cruise movements, 2) asynchronous, cruise movements, and 3) sequential cruise movements. Results of these movements include simulated movements of both normal patients and patients with movement disorders.
by Eugene J. Lim.
M.Eng.
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Pade, Jonas. "Analysis and waveform relaxation for a differential-algebraic electrical circuit model". Doctoral thesis, Humboldt-Universität zu Berlin, 2021. http://dx.doi.org/10.18452/23044.
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Die Hauptthemen dieser Arbeit sind einerseits eine tiefgehende Analyse von nichtlinearen differential-algebraischen Gleichungen (DAEs) vom Index 2, die aus der modifizierten Knotenanalyse (MNA) von elektrischen Schaltkreisen hervorgehen, und andererseits die Entwicklung von Konvergenzkriterien für Waveform Relaxationsmethoden zum Lösen gekoppelter Probleme. Ein Schwerpunkt in beiden genannten Themen ist die Beziehung zwischen der Topologie eines Schaltkreises und mathematischen Eigenschaften der zugehörigen DAE.
Der Analyse-Teil umfasst eine detaillierte Beschreibung einer Normalform für Schaltkreis DAEs vom Index 2 und Abschätzungen, die für die Sensitivität des Schaltkreises bezüglich seiner Input-Quellen folgen. Es wird gezeigt, wie diese Abschätzungen wesentlich von der topologischen Position der Input-Quellen im Schaltkreis abhängen.
Die zunehmend komplexen Schaltkreise in technologischen Geräten erfordern oftmals eine Modellierung als gekoppeltes System. Waveform relaxation (WR) empfiehlt sich zur Lösung solch gekoppelter Probleme, da sie auf die Subprobleme angepasste Lösungsmethoden und Schrittweiten ermöglicht. Es ist bekannt, dass WR zwar bei Anwendung auf gewöhnliche Differentialgleichungen konvergiert, falls diese eine Lipschitz-Bedingung erfüllen, selbiges jedoch bei DAEs nicht ohne Hinzunahme eines Kontraktivitätskriteriums sichergestellt werden kann. Wir beschreiben allgemeine Konvergenzkriterien für WR auf DAEs vom Index 2. Für den Fall von Schaltkreisen, die entweder mit anderen Schaltkreisen oder mit elektromagnetischen Feldern verkoppelt sind, leiten wir außerdem hinreichende topologische Konvergenzkriterien her, die anhand von Beispielen veranschaulicht werden. Weiterhin werden die Konvergenzraten des Jacobi WR Verfahrens und des Gauss-Seidel WR Verfahrens verglichen. Simulationen von einfachen Beispielsystemen zeigen drastische Unterschiede des WR-Konvergenzverhaltens, abhängig davon, ob die Konvergenzbedingungen erfüllt sind oder nicht.The main topics of this thesis are firstly a thorough analysis of nonlinear differential-algebraic equations (DAEs) of index 2 which arise from the modified nodal analysis (MNA) for electrical circuits and secondly the derivation of convergence criteria for waveform relaxation (WR) methods on coupled problems. In both topics, a particular focus is put on the relations between a circuit's topology and the mathematical properties of the corresponding DAE. The analysis encompasses a detailed description of a normal form for circuit DAEs of index 2 and consequences for the sensitivity of the circuit with respect to its input source terms. More precisely, we provide bounds which describe how strongly changes in the input sources of the circuit affect its behaviour. Crucial constants in these bounds are determined in terms of the topological position of the input sources in the circuit. The increasingly complex electrical circuits in technological devices often call for coupled systems modelling. Allowing for each subsystem to be solved by dedicated numerical solvers and time scales, WR is an adequate method in this setting. It is well-known that while WR converges on ordinary differential equations if a Lipschitz condition is satisfied, an additional convergence criterion is required to guarantee convergence on DAEs. We present general convergence criteria for WR on higher index DAEs. Furthermore, based on our results of the analysis part, we derive topological convergence criteria for coupled circuit/circuit problems and field/circuit problems. Examples illustrate how to practically check if the criteria are satisfied. If a sufficient convergence criterion holds, we specify at which rate of convergence the Jacobi and Gauss-Seidel WR methods converge. Simulations of simple benchmark systems illustrate the drastically different convergence behaviour of WR depending on whether or not the circuit topological convergence conditions are satisfied.
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Lai, Yen-Chih y 賴彥志. "Improvement of Integrated-Circuit substrate short failure issue using Ford Eight Disciplines Methodology". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/jus29v.
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Shehu, Edvin. "Broadband equivalent circuit transformer model". 2005. http://link.library.utoronto.ca/eir/EIRdetail.cfm?Resources__ID=370246&T=F.
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Liu, Jen-Hei y 劉貞淮. "Backward Trajectory and Circuit Model". Thesis, 1998. http://ndltd.ncl.edu.tw/handle/69299656957242807606.
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Chang, Jhe-jia y 張哲嘉. "Equivalent Circuit Model of pHEMT". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/76983379795309628889.
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碩士國立雲林科技大學
光學電子工程研究所
95
In this thesis, device models are established for pHEMTs. The device models include a small-signal model and a large-signal model. Conventionally, Yang-Long’s measurement technique was used to extract the source parasitic resistance Rs, and then the cold-FET measurement was performed to extract other parasitic parameters of small-signal model. After extracting the parasitic parameters, one removes the parasitic effects to obtain the intrinsic equivalent circuit of pHEMTs with mathematic algorithms. Finally, using Y-parameters in the intrinsic circuit, one can calculate the intrinsic parameters. In contrast, a new technique using the influence of high-frequency parameters on high-frequency characteristics is proposed in this thesis. A specific procedure of several steps is presented to extract parameters of the small signal model systematically, and the extracted result is satisfactory. To extract DC parameters in the large signal model, equations of the EEHEMT model are used. A specific procedure of extracting DC parameters is developed without using the IC-CAP extraction software. DC characteristics are measured to extract the parameters of the large signal model. Simulation using the ADS (Advanced Design System) software is compared with measurement. The simulated result closely matches the DC measurement. The research results also provide a better insight into the EEHEMT model.
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Chen, Wei-Yu y 陳威宇. "Internal Mobile Phone Antenna with Distributed LC Matching Circuit for Eight-band LTE/WWAN Operation". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/55230103952509757105.
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碩士國立中山大學
電機工程學系研究所
98
In this thesis, an internal mobile phone antenna with a distributed matching circuit for eight-band LTE/WWAN operation is presented. By selecting proper dimensions of the distributed matching circuit, the bandwidth of the proposed antenna can be greatly enhanced. Good radiation characteristics are also obtained, and the proposed antenna occupies only 60 × 10 × 3 mm^3 and is very suitable for slim mobile phone applications. Effects of the human body including user’s head and hand are also studied, and the SAR and HAC issues are simulated and analyzed in this thesis.
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Rodriguez, Juan Antonio. "Process design and circuit model development". Thesis, 1995. http://hdl.handle.net/1911/13990.
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Process design for integrated circuit manufacturing has traditionally been implemented with little simulation prior to fabrication. As with circuit design of a decade ago, the available simulation tools were mainframe-based, often incompatible, and lacked accurate physical models. Recent developments in process and device simulation allow accurate process modeling which reflect actual fabrication plant capabilities. A highly structured simulation environment implemented for development of Texas Instruments' PRISM$\rm\sp{TM}$ technology is described, together with results of a simulation approach to circuit model development for a new class of silicon power transistors. A new analytical model for field effect transistor modeling is also proposed. This new model preserves continuity of both the drain current and conductance over all bias conditions. It also accurately models the effects of substrate bias on device behavior.
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梁雅欽. "An Equivalent Circuit Model for IGBT". Thesis, 1999. http://ndltd.ncl.edu.tw/handle/02272207427350309828.
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Moreira, João Miguel Carvalho Alves. "Nambu - Jona - Lasinio model with six and eight quark interactions". Doctoral thesis, 2009. http://hdl.handle.net/10316/11184.
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Yang, Pei-Jia y 楊沛佳. "Construction of a Unit Gene Circuit Model for Quantitative Gene Circuit Design". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/f2j96u.
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碩士國立陽明大學
生物醫學資訊研究所
104
Abstract The emerging discipline of synthetic biology is dedicated to engineer biological processes with specific functions and desired behaviors for practical use. In order to engineer the functions of cells, synthetic biologists transform engineered gene circuits with specific function into them. Therefore, Massachusetts Institute of Technology established The Registry of Standard Biological Parts (BioBricks) which provides the needed standard biological parts with specific characteristics for synthetic gene circuit design. However, extensive research works are required for engineering synthetic gene circuits with desired behaviors, since the quantitative characteristics of gene circuits are less recognized compared to the qualitative information. Moreover, some of them are difficult to be identified by experiments only. Hence, in order to characterize the quantitative features of each gene circuit we are interested in, in this study, we define the unit gene circuit as the simplest gene circuit including four biological parts: a promoter, a ribosome binding site, a coding gene and a terminator. A mathematically computable unit gene circuit model is then constructed to represent the quantitative features of a unit gene circuit. Furthermore, to generate the data for modeling, we construct synthetic gene circuits by standard biological parts based on lac operon system in E. coli to detect the protein expression and regulation process of gene circuits. Subsequently, the unit gene circuit model is separated into two parts, pre-translational model and post-translational model, to represent the quantitative features of protein expression process before and after gene translation, respectively. Specifically, the binding process between gene regulation factors is described in steady state in the pre-translational model and the dynamic concentration change of gene products in cell is modeled in the post-translational model. Based on the constructed models and experimental data, the parameters in each model are identified using our proposed parameter identification method to make the model predictable. In the process of parameter identification, the parameters in post-translational model are obtained by literature survey and calculation rather than training since the information of experimental data is not sufficient for model training. On the other hand, the parameters in pre-translational model are identified by our proposed method, called Sigmoidization. Finally, the unit gene circuit model with identified parameters are validated by predicting the quantitative features of gene circuit. The results show that the pre-translational model performs well, however, the post-translational model does not due to the imprecision of the surveyed parameters. Despite that the performance of our constructed model may not be fully satisfied, we still make a progress in engineering or designing biological processes by quantitative gene circuit design.
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"Model order reduction techniques for circuit simulation". Research Laboratory of Electronics, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/4161.
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Luis Miguel Silveira.Includes bibliographical references (p. 156-160).
Supported in part by the Semiconductor Research Corporation. SRC 93-SJ-558 Supported in part by the National Science Foundation / Advanced Research Projects Agency. MIP 91-17724
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Cheng, Wen-Chin y 鄭文欽. "Supercapacitor Equivalent Circuit Model With Thermal Effects". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/5529kg.
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碩士國立臺灣科技大學
機械工程系
99
The purpose of this thesis is to establish the supercapacitor equivalent circuit model with voltage and temperature effects on its parameter. Model parameter identification is conducted by alternative current impedance spectroscopy (ACIS) experiment, which uses the least squares method to obtain the supercapacitor equivalent series resistance (ESR), capacitance (C) and RC parallel resistor-capacitor time constant (_ ) at different voltages and temperatures. The supercapacitor model is then validated against experimental data under different charge/discharge cycles and thermal conditions. A potential application of this model to fast warm-up of a supercapacitor in cold weather is demonstrated via simulation. In the future, the supercapacitor model developed in this thesis can be applied to estimation of the state of charge and temperature which is important for the power and thermal management of a power system consisting of supercapacitors.
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Liu, Wei-Chen y 劉瑋宸. "Dynamic Electric Circuit Model for Photovoltaic Panel". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/57412268660596337817.
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碩士國立中山大學
電機工程學系研究所
102
A dynamic electric circuit model is proposed for a photovoltaic (PV) panel with a power electronic converter used for drawing a maximum power with ripple currents. The dynamic circuit model is derived on basis of the static single-diode model, in which the PV diode equation is replaced by a voltage source in series with a resistance standing for the diode’s threshold voltage and conduction loss. In practice, the threshold voltage is approximately identical to the voltage at the maximum power point (MPP). An additional parasitic capacitance is introduced to account for the dynamic characteristics as the instantaneous current goes beyond the MPP. The parasitic capacitance dominates the dynamic voltage-current (V-I) characteristics whereas the PV voltage is less than the threshold, meaning that the diode is at the cut-off state. The circuit parameters of the proposed model can be obtained simply from four test points without the need of the intrinsic parameters of the PV panel given by datasheets. As the light irradiance varies, both the static and dynamic characteristic curves can be easily estimated by stretching along the current axis from the pre-known one. Experimental tests are carried out on a laboratory system with a PV panel attached by a boost converter. The dynamic electric circuit model has been demonstrated to be capable of interpreting the starting transient and the dynamic responses of a PV panel under stable illumination.
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HSU, CHIC-WEI y 許志瑋. "An Integrated Circuit (IC) Yield Model Considering". Thesis, 2003. http://ndltd.ncl.edu.tw/handle/60146019817830040870.
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碩士國立交通大學
工業工程與管理系
91
Yield is always the key point to evaluate the ability of manufacturing for the Integrated circuit (IC) manufacturer. There are two major factors affecting the IC yield. One is the total number of defects on a wafer and the other is the degree of defects clustering on a wafer. As the wafer size increase, the defects clustering phenomenon tends to get serious. Though there are many kinds of cluster index proposed to evaluate the degree of defects clustering, it is still very difficult to quantify the defects clustering phenomenon perfectly by using these cluster indices we had, especially when it comes to an edge type defects pattern on the wafer. In this paper, an “constellation index” which can detect the edge type defects pattern effectively has been developed first. Then an IC yield model which using Backpropagation network (BPN) considering the “constellation index”, the cluster index CIR and defects numbers has been proposed. To verify the effectiveness of the proposed IC yield model, a simulation experiment and a case study are presented. Comparisons are also made among the Negative Binomial yield model, modified yield model and the proposed yield model.
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Ting, Chien-yi y 丁健益. "Comparison between BJT model and MOSFET model with linear circuit elements". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/11935380668995021910.
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碩士國立中央大學
電機工程研究所碩士在職專班
99
In this thesis, to compare the bipolar-junction transistor (BJT) and metal-oxide-semiconductor field-effect transistor (MOSFET) model, we develop nonlinear circuit simulations based on the linear components. The basic linear components include voltage source, resistor, capacitor, and voltage-control current source (VCCS), etc. In the program, we will use explicit representation structure to display the implicit parameters of the nonlinear elements and linear components in the main program. We use the basic linear VCCS with the current and transconductance for Newton-Raphson iteration. The difficulty of MOSFET modeling by linear VCCS will be compared to BJT modeling. We successfully verify the program by the applied circuit of MOSFETs.
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Lee, Siang-Ru y 李翔儒. "Applications of Circuit Breaker Arc Model for Transient Behavior Analysis of Circuit Breaker Interrupting". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/41122242319872728972.
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碩士逢甲大學
電機工程所
96
Be used ATPDraw software in this paper, simulating the transformation of voltage and current in the system when circuit breaker is acting. Using ATPDraw simulates circuit breaker arc model. The mathematic operation of arc model is done by TACS function. And feedbacks continuously operate in the simulated system. The model, that has the dynamic refreshing function, can get the more precisely simulating results. In this paper, circuit breaker arc effect at opening shunt reactor is simulated by this model in Taipower power system. This simulating result compared with the actually test data proves the validation of the proposed model. In addition, this paper uses actual measurements of voltage and current waveforms, with MAYR arc model equation, the voltage and current data, the internal circuit breaker found dielectric strength MAYR Arc model can be used in the equation parameters P and τ changes the protection of the circuit breaker proposal to increase electricity safety.