Dissertations / Theses on the topic 'Adaptive filters Design and construction'
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Sundaralingam, Sathiaseelan. "Evolving optimal IIR and adaptive filters." Thesis, University of Glasgow, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.300977.
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Pfann, Eugen. "Design and analysis of oversampled #sigma# #delta# adaptive LMS filters." Thesis, University of Strathclyde, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273397.
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Köroğlu, Mustafa Hadi. "High frequency integrated filters for wireless applications." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/14458.
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Babatunde, Patrick O. "Norm-based methods in observer design." Thesis, Brunel University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340841.
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Yunus, Haroon Iqbal. "Single phase active power filters." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/13282.
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Hezar, Rahmi. "Oversampled digital filters : a design methodology and implementation." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/14936.
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Zhou, Yi, and 周翊. "Improved analysis and design of efficient adaptive transversal filtering algorithms with particular emphasis on noise, input andchannel modeling." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B36653536.
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Zhou, Yi. "Improved analysis and design of efficient adaptive transversal filtering algorithms with particular emphasis on noise, input and channel modeling." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B36653536.
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Salah, Ben Romdhane Mohamed. "Design synthesis of application-specification ICs for DSP." Diss., Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/15392.
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Alexandrou, Alexandros. "Design of filter banks for subband coding systems." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63318.
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Johnson, Eric N. "Limited authority adaptive flight control." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/12953.
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Ritter, Robert D. "Parametric design of an adaptive line enhancer for multiple switching tones in a correlated noise environment." Thesis, Virginia Tech, 1988. http://hdl.handle.net/10919/45170.
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This thesis demonstrates how a Fast Gradient approximation to a Lattice Filter can be used as an Adaptive Line Enhancer for sampled data consisting of multiple switching tones in correlated noise. A tradeoff analysis is performed with four methods of digital filtering including a conventional Digital Fourier Transform (DFT) algorithm, a Least Mean Squares (LMS) adaptive algorithm, a Fast Recursive Least Squares (Fast RLS) adaptive algorithm, and the Fast Gradient adaptive algorithm. The DFT algorithm is incapable of removing correlations from the incoming noise, and the LMS and Fast RLS algorithms become unstable when a dynamic switching environment is being filtered. The Fast Gradient adaptive algorithm simulated on a computer is robust and capable of converging to an optimal set of FIR filter weights with minimum Mean Squared Error. Parameters for the Fast Gradient algorithm are optimized to provide good filter performance with a minimum number of computations.Master of Science
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Ni, Meng Yang. "Design of bandpass filter based on cross-shaped slotline resonators." Thesis, University of Macau, 2017. http://umaclib3.umac.mo/record=b3691134.
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Fox, Alan Sherwood. "An enhanced design procedure for microstrip band pass filters." Thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-05022009-040349/.
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Ernst, Eric Gerard. "Architecture design of a scalable adaptive deblocking filter for H.264/AVC /." Online version of thesis, 2007. http://hdl.handle.net/1850/5390.
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Szalkowski, Michael James. "An FPGA architecture design of a high performance adaptive notch filter /." Online version of thesis, 2008. http://hdl.handle.net/1850/7773.
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Barnes, Lemuel Gregory III. "Voltage-source inverter output waveform compensation using adaptive intelligent control." Diss., Virginia Tech, 1994. http://hdl.handle.net/10919/39997.
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A single-layer neural network-based voltage compensation technique which generates minimum-distortion sinusoidal output voltages from a three-phase PWM inverter used for uninterruptible power supplies (UPS) is described. The proposed compensation technique is implemented in a microprocessor-based controller constructed in the stationary d-q frame where the controller sampling rate is twice the inverter switching frequency. The structure of a feed-forward artificial neural network connects network inputs and outputs through multiple linear or nonlinear
neuron models, and processes these input/output data associations in a
parallel distributed manner. Network inputs in the form of UPS load voltage commands and load current feedback are propagated forward in the network each controller sampling period generating the inverter output voltage commands, the network outputs, which are converted to three phase inverter switching Signals using the space vector PWM waveform generation process.Ph. D.
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Bajic, Vladan. "DESIGN AND IMPLEMENTATION OF AN ADAPTIVE NOISE CANCELING SYSTEM IN WAVELET TRANSFORM DOMAIN." University of Akron / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=akron1132784671.
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Brotman, Susan Rose. "The Evaluation of Device Model Dependence in the Design of a High-Frequency, Analog, CMOS Transconductance-C Filter." PDXScholar, 1994. https://pdxscholar.library.pdx.edu/open_access_etds/4701.
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It is important to have the ability to predict the effects of device model variation when designing integrated transconductance-C type active filters. Applying these filters to integrated circuit design has become increasingly popular due to its ease of implementation in monolithic form. With the introduction of fully automated design tools, predictable behavior of high-level variables becomes still more important. The purpose of this study is to evaluate the process parameter spread of analog device models to determine the effect on the design parameters of an active filter. This information's significant contribution directly effects the feasibility and realization of automating analog filter design. In order to explore the dependence of filter performance on the device v model parameter spread, a fifth-order inverse Chebyshev filter is designed and simulated using a two year history of process models. It has not been observed that higher order filters have been successfully designed using fully automated design tools. This filter was realized using automated filter design currently being developed in parallel with this study. A single-ended input to single-ended output transconductance amplifier is chosen for this design for its simplicity and small size. Differential performance is easily adapted with exact duplication which is demonstrated in the measurements of the fabricated filter. Simulation of the design is performed using MOSIS SCNA device parameters. Filter performance data such as cutoff frequency, stopband attenuation, and phase response is collected. Experimental results from the fabricated device are compared to simulation and the original prototype. 2 It is shown that the most predicable effect on the design parameters of a filter is caused by the parasitic output conductance parameter g0. This process dependent variable causes both a deviation in the cutoff frequency, and a decrease in the filter quality factor. In addition, it is also shown that the practice employed to predistort for absorption of parasitic capacitors in a MOS technology is a very effective tool in the reduction of capacitive process dependence.n software
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Dong, Zhiwei. "Low-power, low-distortion constant transconductance Gm-C filters." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/25400.
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Wang, Lei. "Design and implementation of a three-phase three-wire thyristor controlled LC-coupling hybrid active power filter with low dc-link voltage and wide compensation range." Thesis, University of Macau, 2017. http://umaclib3.umac.mo/record=b3691876.
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Xiao, Haiqiao. "Design of Radio-Frequency Filters and Oscillators in Deep-Submicron CMOS Technology." PDXScholar, 2008. https://pdxscholar.library.pdx.edu/open_access_etds/5233.
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Radio-frequency filters and oscillators are widely used in wireless communication and high-speed digital systems, and they are mostly built on passive integrated inductors, which occupy a relative large silicon area. This research attempted to implement filters and oscillators operating at 1-5 GHz using transistors only, to reduce the circuits’ area. The filters and oscillators are designed using active inductors, based on the gyrator principle; they are fabricated in standard digital CMOS technology to be compatible with logic circuits and further lower the cost. To obtain the highest operating frequency, only parasitic capacitors were used.
Two new active-inductor circuits are derived from this research, labeled allNMOS and all-NMOS-II. The all-NMOS active inductor was used to design high-Q bandpass filters and oscillators, which were fabricated in TSMC’s 0.18-µm digital CMOS process. The highest center frequency measured was 5.7 GHz at 0.20-µm gate length and the maximum repeatably measured Q was 665. 2.4-GHz circuits were also designed and fabricated in 0.40-µm gate length. The all-NMOS-II circuit has superior linearity and signal fidelity, which are robust against process and temperature variations, due to its novel structure. It was used in signal drivers and will be fabricated in commercial products.
Small-signal analysis was conducted for each of the active-inductor, filter and oscillator circuits, and the calculated performance matches those from simulations. The noise performance of the active inductor, active-inductor filter and oscillator was also analyzed and the calculated results agree with simulations. The difference between simulation and measured results is about 10% due to modeling and parasitic extraction error.
The all-NMOS active-inductor circuit was granted a US patent. The US patent for all-NMOS-II circuit is pending. This research generated three conference papers and two journal papers.
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Wu, Pan. "The Design of High-Frequency Continuous-Time Integrated Analog Signal Processing Circuits." PDXScholar, 1993. https://pdxscholar.library.pdx.edu/open_access_etds/1162.
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High-performance, high-frequency operational transconductance amplifiers (OTAs) are very important elements in the design of high-frequency continuous-time integrated analog signal processing circuits, because resistors, inductors, integrators, mutators, buffers, multipliers, and filters can be built by OTAs and capacitors. The critical considerations for OTA design are linearity, tuning, frequency response, output impedance, power supply rejection (PSR) and common-mode rejection (CMR). For linearity considerations, two different methods are proposed. One uses cross-coupled pairs (CMOS or NMOS), producing OTAs with very high linearity but either the input range is relatively small or the CMR to asymmetrical inputs is poor. Another employs multiple differential pairs (current addition or subtraction), producing OTAs with high linearity over a very large input range. So, there are tradeoffs among the critical considerations. For different applications, different OTAs should be selected. For consideration of frequency response, the first reported GaAs OTA was designed for achieving very-high-frequency performance, instead of using AC compensation techniques. GaAs is one of the fastest available technologies, but it was new and less mature than silicon when we started the design in 1989. So, there were several issues, such as low output impedance, no P-channel devices, and Schottky clamp. To overcome these problems, new techniques are proposed, and the designed OTA has comparable performance to a CMOS OTA. For PSR and CMR considerations, a fully balanced circuit structure is employed with a common-mode feedback (CMF) circuit used to stabilize the DC output voltages. To reduce the interaction of the operation of CMF and tuning of OTAs, three improved versions of the CMF circuits used in operational amplifiers are proposed. With the designed OTAs, a I GHz GaAs inductor with small parasitics is designed using the proposed procedure to reduce high-frequency effects. Two CMOS high-order, high-frequency filters are designed: one in cascade structure and one in LC ladder form. Also, a 200 MHz third-order elliptic GaAs filter is designed with special consideration of very-high-frequency parasitics. All circuits were fabricated and measured. The experimental results were used to verify the designs.
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Wang, Li Kang. "Design of ultra-wideabnd [sic] bandpass filter with reconfigurable bandwidth and notch using microstrip and slotline structure." Thesis, University of Macau, 2017. http://umaclib3.umac.mo/record=b3691126.
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Tsui, Kai-man, and 徐啟民. "New design methods for perfect reconstruction filter banks." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B30144991.
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Chang, Chih-Hui 1967. "An Adaptive Linearization Method for a Constraint Satisfaction Problem in Semiconductor Device Design Optimization." Thesis, University of North Texas, 1999. https://digital.library.unt.edu/ark:/67531/metadc500248/.
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The device optimization is a very important element in semiconductor technology advancement. Its objective is to find a design point for a semiconductor device so that the optimized design goal meets all specified constraints. As in other engineering fields, a nonlinear optimizer is often used for design optimization. One major drawback of using a nonlinear optimizer is that it can only partially explore the design space and return a local optimal solution. This dissertation provides an adaptive optimization design methodology to allow the designer to explore the design space and obtain a globally optimal solution. One key element of our method is to quickly compute the set of all feasible solutions, also called the acceptability region. We described a polytope-based representation for the acceptability region and an adaptive linearization technique for device performance model approximation. These efficiency enhancements have enabled significant speed-up in estimating acceptability regions and allow acceptability regions to be estimated for a larger class of device design tasks. Our linearization technique also provides an efficient mechanism to guarantee the global accuracy of the computed acceptability region. To visualize the acceptability region, we study the orthogonal projection of high-dimensional convex polytopes and propose an output sensitive algorithm for projecting polytopes into two dimensions.
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Iltis, Ronald A. "Adaptive Space-Time Waveform Design in Ad hoc Networks using the IMMSE Algorithm." International Foundation for Telemetering, 2004. http://hdl.handle.net/10150/605789.
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International Telemetering Conference Proceedings / October 18-21, 2004 / Town & Country Resort, San Diego, CaliforniaAn Ad hoc network with unicasting is considered, in which each node has an M element antenna array. Transmission from node l(i) to i is quasi-synchronous, so that code acquisition is not required. Space-Time (S-T) waveforms are transmitted with temporal dimension Ns Nyquist samples. An adaptive, distributed S-T waveform design algorithm is developed, which maintains QoS while attempting to minimize transmit power. The resulting Iterative Minimum Mean-Square Error{Time Reversal algorithm (IMMSE-TR) sets the transmit S-T vector at node i to the conjugate time-reverse of the linear MMSE S-T detector. It is shown that IMMSE-TR corresponds to a noncooperative game which attempts to minimize transmit power while paying an interference tax. Simulation results are presented demonstrating high power efficiencies for heavily-loaded systems.
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Fakhry, Nader. "Design of a Digital Compensation Filter." PDXScholar, 1995. https://pdxscholar.library.pdx.edu/open_access_etds/4961.
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The 24-bit Motorola DSP56001 processor will be used in combination with the DSP56ADC16 and the PCM-56 to design a good FIR compensation filter. Our objective is to digitize the input analog signal, and to compensate for the attenuation in the magnitude response of the digital sine wave. Two different experiments will be conducted, a hands on approach, and a simulation program. The first one will be realized directly, using the DSP system. We will determine the magnitude response of the system, and then deduce the coefficients of the FIR sin(x)/x filter. A look up table will store those values which will be fetched by the DSP program. With a minimum set of instructions we will generate a new digital output sequence after a N-point circular convolution is performed. The output signal is a good reconstruction of the input signal at frequencies below 22 Khz. However, a second experiment will be needed to improve this FIR sin(x)/x compensation filter, because we are not able to go beyond a 300-point impulse sequence. After that value (300-point), the time that each value is read and is ready to be processed by the DSP56001 becomes smaller than the time each instruction in the DSP program is executed and written to the PCM-56 via the SSI register. To be able to expand our experiment, we need to write a simulation program. A simulation program of the previous experiment, which take as input the measured magnitude response of the system. The challenge will be to find ways to map the frequency domain, by using the maximum value of each linear convolution sequence, with a finite input sequence. A step by step approach will be drawn until our final objective is reached. Our final step will be, to increase the number of sampling point in the frequency domain and will be to demonstrate that the result of the simulated program value will coincide with our objective, which is to compensate for the attenuation of the magnitude response of the system. By increasing the sampling frequency we will eventually obtain a good compensation filter.
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Chandrasekaran, Girish. "Design of a Second-order Filter Using the gm-C Technique." PDXScholar, 1996. https://pdxscholar.library.pdx.edu/open_access_etds/5241.
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This thesis deals with the design, layout, fabrication, testing and characterization of a second-order filter (biquad) using the transconductance-C (gm-C) technique. The biquad was designed to realize the four filter functions - lowpass, highpass, bandpass and notch - by appropriate choice of input and output terminals and element values. The tunable range of frequencies for the biquad was designed to be 18-59MHz. The quality factor of the biquad was designed to be tunable from approximately 1/3 to 3. The filter was designed in LEVEL2 SPICE, laid out using MAGIC, and the circuit was fabricated using MOSIS's 2μm CMOS analog (n-well) process. The circuit board for testing the chip was designed using the PCB design system -PADS-PCB. The chip was tested using the Network Analyzer HP 4195A. The performance of the filter was then compared with the design objectives and simulation results. Both the pole frequency and the quality factor were found to be tunable by the same factor as the design. Noise analysis showed the output noise to be less than -65dB. The notch function could not be experimentally verified due to high sensitivity of this function to component tolerances and process variations. Power dissipation of the filter was found to be 6m W.
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Alvarez, Juan Camilo. "Estimation of the Longitudinal and Lateral Velocities of a Vehicle using Extended Kalman Filters." Thesis, Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/13951.
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Vehicle motion and tire forces have been estimated using extended Kalman filters for many years. The use of extended Kalman filters is primarily motivated by the simultaneous presence of nonlinear dynamics and sensor noise. Two versions of extended Kalman filters are employed in this thesis: one using a deterministic tire-force model and the other using a stochastic tire-force model. Previous literature has focused on linear stochastic tire-force models and on linear deterministic tire-force models. However, it is well known that there exists a nonlinear relationship between slip variables and tire-force variables. For this reason, it is suitable to use a nonlinear deterministic tire-force model for the extended Kalman filter, and this is the novel aspect at this work. The objective of this research is to show the improvement of the extended Kalman filter using a nonlinear deterministic tire-force model in comparison to linear stochastic tire-force model. The simulation model is a seven degree-of-freedom bicycle model that includes vertical suspension dynamics but neglects the roll motion. A comparison between the linear stochastic tire-force model and the nonlinear deterministic tire-force model confirms the expected results. Simulation studies are performed on some illustrative examples obtaining good tracking performance.
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劉心雄 and Sum-hung Lau. "Adaptive FEM preprocessing for electro magnetic field analysis of electric machines." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1995. http://hub.hku.hk/bib/B31212451.
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Pham, Tien Ke. "Low-power, high-accuracy, and fast-tuning integrated continuous-time 450-KHz bandpass filter." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/13525.
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Poon, Kai-yin Kenny, and 潘啟然. "An investigation on the application of nonlinear robust adaptive control theory in AC/DC power systems." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B38898949.
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Mefteh, Wafa. "Simulation based design for adaptive multi-agent systems with the ADELFE methodology." Toulouse 3, 2014. http://thesesups.ups-tlse.fr/3062/.
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"Certains systèmes sont qualifiés de complexes par l'hétérogénéité et la diversité des acteurs en jeu, par la masse importante des données, par la distribution des informations manipulées ainsi que par la dynamique des environnements dans lesquels ils sont plongés. La modélisation de tels systèmes complexes nécessite l'utilisation de techniques efficientes. Durant ces dernières années, plusieurs travaux de recherche se sont intéressés aux développements de nouvelles techniques plus adaptées à ce genre de problèmes. La théorie des AMAS (Adaptive Multi-Agent System) a été proposée pour modéliser des systèmes complexes. Elle a montré que pour un système plongé dans un environnement dynamique, un système en interactions coopératives avec son environnement est fonctionnellement adéquat. La méthode ADELFE a été proposée afin de guider les concepteurs d'AMAS à travers une démarche basée sur le RUP (Rational Unified Process). Cependant, la théorie des AMAS stipule que le concepteur doit trouver toutes les Situations Non Coopératives qu'un agent peut rencontrer ou créer. Pour chacune de ces situations, il doit alors donner les actions à exécuter pour assurer à l'agent de revenir et de rester dans un état coopératif envers les autres et lui-même. Construire de tels systèmes auto-organisés n'est pas une tâche évidente. L'objectif de cette thèse est de doter les agents de comportements permettant de "s'auto-concevoir" et de valider ces systèmes. Le but est d'aider le concepteur, de le décharger de la difficulté inhérente à la recherche du comportement coopératif des agents et d'accélérer le temps de conception. Pour cela, cette thèse a étudié les apports de la simulation pour la conception de ces systèmes. La simulation permet d'améliorer et de tester le comportement d'un agent mais aussi le comportement du collectif. L'objectif est aussi d'enrichir la méthodologie ADELFE par un processus d'ingénierie et des outils pour réaliser de la "conception vivante" qui intègre les techniques de modélisation, de programmation et de simulation. "Some complex systems are qualified by the heterogeneity and diversity of actors involved, the large mass of data, by the distribution of the manipulated information and also by the dynamic of the environments in which they are immersed. Modeling such complex systems requires the use of efficient techniques. In recent years, several research works are interested in the development of new techniques best suited to this kind of problems. The AMAS theory (Adaptive Multi-Agent System) was proposed to model complex systems. This theory has shown that for a system immersed in a dynamic environment, a system in cooperative interactions with its environment is functionally adequate. The ADELFE methodology was proposed to guide the AMAS designers through an approach based on the RUP (Rational Unified Process). However, the AMAS theory stipulates that the designer must find all Non Cooperative Situations that an agent may encounter or create. For each of these situations, it must give the actions to be performed to ensure the agent to come back and stay in a cooperative state with others and himself. Building such self-organizing systems is not an easy task. The objective of this thesis is to provide agents behaviours to self-design and validate these systems. The goal is to help the designer, to discharge him from the inherent difficulty in search of cooperative behaviour of agents and accelerate design time. For this, this thesis studied the contribution of simulation to design these systems. Simulation enables to improve and test the behaviour of an agent but also the behaviour of the collective. The objective is also to enrich the ADELFE methodology by engineering processes and tools to achieve the "living design" that integrates modelling, programming and simulation techniques
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Troutman, Tia Shawana. "Development of low viscosity, high dielectric constant polymers for integral passive applications." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/8683.
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Unnikrishnan, Suraj. "Adaptive Envelope Protection Methods for Aircraft." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/11478.
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Carefree handling refers to the ability of a pilot to operate an aircraft without the need to continuously monitor aircraft operating limits. At the heart of all carefree handling or maneuvering systems, also referred to as envelope protection systems, are algorithms and methods for predicting future limit violations. Recently, envelope protection methods that have gained more acceptance, translate limit proximity information to its equivalent in the control channel. Envelope protection algorithms either use very small prediction horizon or are static methods with no capability to adapt to changes in system configurations. Adaptive approaches maximizing prediction horizon such as dynamic trim, are only applicable to steady-state-response critical limit parameters. In this thesis, a new adaptive envelope protection method is developed that is applicable to steady-state and transient response critical limit parameters. The approach is based upon devising the most aggressive optimal control profile to the limit boundary and using it to compute control limits. Pilot-in-the-loop evaluations of the proposed approach are conducted at the Georgia Tech Carefree Maneuver lab for transient longitudinal hub moment limit protection. Carefree maneuvering is the dual of carefree handling in the realm of autonomous Uninhabited Aerial Vehicles (UAVs). Designing a flight control system to fully and effectively utilize the operational flight envelope is very difficult. With the increasing role and demands for extreme maneuverability there is a need for developing envelope protection methods for autonomous UAVs. In this thesis, a full-authority automatic envelope protection method is proposed for limit protection in UAVs. The approach uses adaptive estimate of limit parameter dynamics and finite-time horizon predictions to detect impending limit boundary violations. Limit violations are prevented by treating the limit boundary as an obstacle and by correcting nominal control/command inputs to track a limit parameter safe-response profile near the limit boundary. The method is evaluated using software-in-the-loop and flight evaluations on the Georgia Tech unmanned rotorcraft platform- GTMax. The thesis also develops and evaluates an extension for calculating control margins based on restricting limit parameter response aggressiveness near the limit boundary.
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Hagerty, David Joseph. "Designing and Simulating a Multistage Sampling Rate Conversion System Using a Set of PC Programs." PDXScholar, 1993. https://pdxscholar.library.pdx.edu/open_access_etds/4697.
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The thesis covers a series of PC programs that we have written that will enable users to easily design FIR linear phase lowpass digital filters and multistage sampling rate conversion systems. The first program is a rewrite of the McClellanParks computer program with some slight modifications. The second program uses an algorithm proposed by Rabiner that determines the length of a lowpass digital filter. Rabiner used a formula proposed by Herrmann et al. to initially estimate the filter length in his algorithm. The formula, however, assumes unity gain. We present a modification to the formula so that the gain of the filter is normalized to accommodate filters that have a gain greater than one (as in the case of a lowpass filter used in an interpolator). We have also changed the input specifications from digital to analog. Thus, the user supplies the sampling rate, passband frequency, stopband frequency, gain, and the respective maximum band errors. The program converts the specifications to digital. Then, the program iteratively estimates the filter length and interacts with the McClellan-Parks Program to determine the actual filter length that minimizes the maximum band errors. Once the actual length is known, the filter is designed and the filter coefficients may be saved to a file. Another new finding that we present is the condition that determines when to add a lowpass filter to a multistage decimator in order to reduce the total number of filter taps required to implement the system. In a typical example, we achieved a 34% reduction in the total required number of filter taps. The third program is a new program that optimizes the design of a multistage sampling rate conversion system based upon the sum of weighted computational rates and storage requirements. It determines the optimum number of stages and the corresponding upsampling and downsampling factors of each stage of the design. It also determines the length of the required lowpass digital filters using the second program. Quantization of the filter coefficients may have a significant impact on the frequency response. Consequently, we have included a routine within our program that determines the effects of such quantization on the allowable error margins within the passband and stopband. Once the filter coefficients are calculated, they can be saved to files and used in an appropriate implementation. The only requirements of the user are the initial sampling rate, final sampling rate, passband frequency, stopband frequency, corresponding maximum errors for each band, and the weighting factors to determine the optimization factor. We also present another new program that implements a sampling rate conversion from CD (44.1 kHz) to DAT (48 kHz) for digital audio. Using the third program to design the filter coefficients, the fourth program converts an input sequence (either samples of a sine wave or a unit sample sequence) sampled at the lower rate to an output sequence sampled at the higher rate. The frequency response is then plotted and the output block may be saved to a file.
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Swanson, Davin Karl. "Implementation of arbitrary path constraints using dissipative passive haptic displays." Diss., Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/17606.
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Hagerty, David Joesph. "Designing and Simulating a Multistage Sampling Rate Conversion System Using a Set of PC Programs." PDXScholar, 1993. https://pdxscholar.library.pdx.edu/open_access_etds/4762.
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The thesis covers a series of PC programs that we have written that will enable users to easily design FIR linear phase lowpass digital filters and multistage sampling rate conversion systems. The first program is a rewrite of the McClellanParks computer program with some slight modifications. The second program uses an algorithm proposed by Rabiner that determines the length of a lowpass digital filter. Rabiner used a formula proposed by Herrmann et al. to initially estimate the filter length in his algorithm. The formula, however, assumes unity gain. We present a modification to the formula so that the gain of the filter is normalized to accommodate filters that have a gain greater than one (as in the case of a lowpass filter used in an interpolator). We have also changed the input specifications from digital to analog. Thus, the user supplies the sampling rate, passband frequency, stopband frequency, gain, and the respective maximum band errors. The program converts the specifications to digital. Then, the program iteratively estimates the filter length and interacts with the McClellan-Parks Program to determine the actual filter length that minimizes the maximum band errors. Once the actual length is known, the filter is designed and the filter coefficients may be saved to a file. Another new finding that we present is the condition that determines when to add a lowpass filter to a multistage decimator in order to reduce the total number of filter taps required to implement the system. In a typical example, we achieved a 34% reduction in the total required number of filter taps. The third program is a new program that optimizes the design of a multistage sampling rate conversion system based upon the sum of weighted computational rates and storage requirements. It determines the optimum number of stages and the corresponding upsampling and downsampling factors of each stage of the design. It also determines the length of the required lowpass digital filters using the second program. Quantization of the filter coefficients may have a significant impact on the frequency response. Consequently, we have included a routine within our program that determines the effects of such quantization on the allowable error margins within the passband and stopband. Once the filter coefficients are calculated, they can be saved to files and used in an appropriate implementation. The only requirements of the user are the initial sampling rate, final sampling rate, passband frequency, stop band frequency, corresponding maximum errors for each band, and the weighting factors to determine the optimization factor. We also present another new program that implements a sampling rate conversion from CD (44.1 kHz) to DAT (48 kHz) for digital audio. Using the third program to design the filter coefficients, the fourth program converts an input sequence (either samples of a sine wave or a unit sample sequence) sampled at the lower rate to an output sequence sampled at the higher rate. The frequency response is then plotted and the output block may be saved to a file.
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Kim, Chul. "3D-SoftChip: A novel 3D vertically integrated adaptive computing system [thesis]." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2005. https://ro.ecu.edu.au/theses/656.
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At present, as we enter the nano and giga-scaled integrated-circuit era, there are many system design challenges which must be overcome to resolve problems in current systems. The incredibly increased nonrecurring engineering (NRE) cost, abruptly shortened Time-to- Market (ITA) period and ever widening design productive gaps are good examples illustrating the problems in current systems. To cope with these problems, the concept of an Adaptive Computing System is becoming a critical technology for next generation computing systems. The other big problem is an explosion in the interconnection wire requirements in standard planar technology resulting from the very high data-bandwidth requirements demanded for real-time communications and multimedia signal processing. The concept of 3D-vertical integration of 2D planar chips becomes an attractive solution to combat the ever increasing interconnect wire requirements. As a result, this research proposes the concept of a novel 3D integrated adaptive computing system, which we term 3D-ACSoC. The architecture and advanced system design methodology of the proposed 3D-SoftChip as a forthcoming giga-scaled integrated circuit computing system has been introduced, along with high-level system modeling and functional verification in the early design stage using SystemC.
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Kumar, Ajay. "A novel Q tuning technique for high-Q high-frequency IF bandpass filter." Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/15904.
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Mears, Michael Laine. "Geometry estimation and adaptive actuation for centering preprocessing and precision measurement." Diss., Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-03312006-125319/.
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Thesis (Ph. D.)--Mechanical Engineering, Georgia Institute of Technology, 2006.Dr. Richard F. Salant, Committee Member ; Dr. Shreyes N. Melkote, Committee Member ; Dr. Francis M. Kolarits, Committee Member ; Dr. Jane C. Ammons, Committee Member ; Dr. Thomas R. Kurfess, Committee Chair.
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Amarnath, Avinash. "A Self-Configurable Architecture on an Irregular Reconfigurable Fabric." PDXScholar, 2011. https://pdxscholar.library.pdx.edu/open_access_etds/634.
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Reconfigurable computing architectures combine the flexibility of software with the performance of custom hardware. Such architectures are of particular interest at the nanoscale level. We argue that a bottom-up self-assembled fabric of nodes will be easier and cheaper to manufacture, however, one has to make compromises with regards to the device regularity, homogeneity, and reliability. The goal of this thesis is to evaluate the performance and cost of a self-configurable computing architecture composed of simple reconfigurable nodes for unstructured and unknown fabrics. We built a software and hardware framework for this purpose. The framework enables creating an irregular network of compute nodes where each node can be configured as a simple 2-input, 4-bit logic gate. The compute nodes are organized hierarchically by sending a packet through a top anchor node that recruits compute nodes with a chemically-inspired algorithm. The nodes are then self-configured by means of a gate-level netlist describing any digital logic circuit. A topology-agnostic optimization algorithm inspired by simulated annealing is then initiated to self-optimize the circuit for latency. Latency comparisons between non-optimized, brute-force optimized and our optimization algorithm are made. We further implement the architecture in VHDL and evaluate hardware cost, area, and energy consumption. The simple on-chip topology-agnostic optimization algorithm we propose results in a significant (up to 50\%) performance improvement compared to the non-optimized circuits. Our findings are of particular interest for emerging nano and molecular-scale circuits.
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Sperlich, Roland. "Adaptive power amplifier linearization by digital pre-distortion with narrowband feedback using genetic algorithms." Diss., Available online, Georgia Institute of Technology, 2005, 2005. http://etd.gatech.edu/theses/available/etd-06232005-152633/.
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Thesis (Ph. D.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2006.Leach, William M., Committee Member ; Sills, James A., Committee Member ; Kenney, J. Stevenson, Committee Chair ; Zhou, G. Tong, Committee Co-Chair ; Fenney, Robert K., Committee Member.
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Vong, Chi Man. "Integrated machine learning techniques with application to adaptive decision support system for automotive engineering." Thesis, University of Macau, 2005. http://umaclib3.umac.mo/record=b1637079.
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Yiu, Candy. "High Speed Wireless Networking for 60GHz." PDXScholar, 2011. https://pdxscholar.library.pdx.edu/open_access_etds/373.
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This thesis examines the problem of providing high data-rate wireless connectivity to users in indoor environments. The goal is to be able to reach Gbps/user rates even when there are multiple users present. The technology that we study is to use the 60 GHz spectrum whose special propagation properties make it ideally suited to this task. The approaches developed include using multiple spatially distributed smart antennas in a room or multiple co-located antennas to provide coverage where needed and when needed. All the antennas are connected to a single access point which allows us to dynamically change spectrum and link allocation among the users (as they move or as their needs change). The innovations in this work include the exploitation of the special properties of 60 GHz and the corresponding design of algorithms for efficient spectrum allocation. We use detailed simulations to demonstrate that very high data rates are indeed achievable.
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Caenepeel, Matthias. "Techniques de modélisation pour une conception efficace de filtres passe-bande micro-ondes." Thesis, Université Côte d'Azur (ComUE), 2016. http://www.theses.fr/2016AZUR4052.
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La conception de filtres hautes fréquences requiert l’optimisation des paramètres physiques du filtre afin d’obtenir une réponse en fréquence qui remplit les conditions imposées par le gabarit de fréquence. Cette optimisation dépend de simulations électromagnétiques. La résolution de ces équations aux dérivées partielles étant très couteuse en temps de calcul, nous proposons de développer des modèles pour le filtre qui permettent de réduire le nombre de simulations EM nécessaires au réglage du filtre. Le but recherché est d’incorporer ces modèles dans une méthode de conception assistée par ordinateur. Dans cette thèse, je propose différentes approches pour la modélisation du filtre. La première approche utilise la matrice de couplage du filtre, qu’elle décrit en fonction des paramètres physiques. La deuxième approche modélise les paramètres S en fonction de ces mêmes paramètres. Dans la première méthode, on se concentre essentiellement sur l’extraction de la matrice de couplage physique. On introduit une technique pour estimer la matrice de sensibilité (le Jacobien) qui lie les paramètres physiques aux paramètres de couplage. Cette estimation utilise les sensibilités adjointes des paramètres. L’utilisation de cette information réduit drastiquement le nombre de simulations EM et donc le temps de calcul global. Une deuxième approche utilise le concept de méta-modèle. L’idée maitresse de cette approche est que l’évaluation de ce modèle est numériquement beaucoup plus avantageuse que celle des simulations EM. Les méthodes développées sont tour à tour appliquées à la conception de filtres complexes qui sont réalisés en technologie microstripThe design of microwave bandpass filter generally requires optimization or fine-tuning of the physical design parameters in order to meet the electrical specifications given by a frequency template. In this thesis we develop models to assist the designer in the time-efficient physical design of the distributed element microwave filters. The aim is to incorporate these models in different CAD methods. By a time-efficient design, we mean a design that requires a low number of EM simulations. The EM-simulations typically represent the most time-consuming step during the optimization process. We propose different modeling approaches for the frequency response behavior of the filter. The first approach models the coupling matrix as a function of the physical design parameters and the second approach models the scattering parameters, again as a function of the physical parameters. In the first part we focus on the extraction of the coupling matrix. We introduce a novel CAT technique based on an efficient estimation of the Jacobian of the function relating the design parameters to the coupling parameters. The estimation of the Jacobian uses adjoint sensitivity analysis, which drastically reduces the number of required EM-simulations. In the second part of the thesis we propose an alternative modeling approach which is based on the concept of a metamodel. The idea is that the metamodel is numerically much cheaper to evaluate than the original simulation model while keeping an acceptable accuracy. We apply these methods to several state of-the-art microstrip bandpass filters
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Moustapha, Maliki. "Métamodèles adaptatifs pour l'optimisation fiable multi-prestations de la masse de véhicules." Thesis, Clermont-Ferrand 2, 2016. http://www.theses.fr/2016CLF22670/document.
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Cette thèse s’inscrit dans le cadre des travaux menés par PSA Peugeot Citroën pour l’allègement de ses véhicules. Les optimisations masse multi-prestations réalisées sur le périmètre de la structure contribuent directement à cette démarche en recherchant une allocation d’épaisseurs de tôles à masse minimale qui respectent des spécifications physiques relatives à différentes prestations (choc, vibro-acoustique, etc.). Ces spécifications sont généralement évaluées à travers des modèles numériques à très haute-fidélité qui présentent des temps de restitution particulièrement élevés. Le recours à des fonctions de substitution, connues sous le nom de métamodèles, reste alors la seule alternative pour mener une étude d’optimisation tout en respectant les délais projet. Cependant la prestation qui nous intéresse, à savoir le choc frontal, présente quelques particularités (grande dimensionnalité, fortes non-linéarités, dispersions physique et numérique) qui rendent sa métamodélisation difficile.L’objectif de la thèse est alors de proposer une approche d’optimisation basée sur des métamodèles adaptatifs afin de dégager de nouveaux gains de masse. Cela passe par la prise en compte du choc frontal dont le caractère chaotique est exacerbé par la présence d’incertitudes. Nous proposons ainsi une méthode d’optimisation fiabiliste avec l’introduction de quantiles comme mesure de conservatisme. L’approche est basée sur des modèles de krigeage avec enrichissement adaptatif afin de réduire au mieux le nombre d’appels aux modèles éléments finis. Une application sur un véhicule complet permet de valider la méthodeOne of the most challenging tasks in modern engineering is that of keeping the cost of manufactured goods small. With the advent of computational design, prototyping for instance, a major source of expenses, is reduced to its bare essentials. In fact, through the use of high-fidelity models, engineers can predict the behaviors of the systems they design quite faithfully. To be fully realistic, such models must embed uncertainties that may affect the physical properties or operating conditions of the system. This PhD thesis deals with the constrained optimization of structures under uncertainties in the context of automotive design. The constraints are assessed through expensive finite element models. For practical purposes, such models are conveniently substituted by so-called surrogate models which stand as cheap and easy-to-evaluate proxies. In this PhD thesis, Gaussian process modeling and support vector machines are considered. Upon reviewing state-of-the-art techniques for optimization under uncertainties, we propose a novel formulation for reliability-based design optimization which relies on quantiles. The formal equivalence of this formulation with the traditional ones is proved. This approach is then coupled to surrogate modeling. Kriging is considered thanks to its built-in error estimate which makes it convenient to adaptive sampling strategies. Such an approach allows us to reduce the computational budget by running the true model only in regions that are of interest to optimization. We therefore propose a two-stage enrichment scheme. The first stage is aimed at globally reducing the Kriging epistemic uncertainty in the vicinity of the limit-state surface. The second one is performed within iterations of optimization so as to locally improve the quantile accuracy. The efficiency of this approach is demonstrated through comparison with benchmark results. An industrial application featuring a car under frontal impact is considered. The crash behavior of a car is indeed particularly affected by uncertainties. The proposed approach therefore allows us to find a reliable solution within a reduced number of calls to the true finite element model. For the extreme case where uncertainties trigger various crash scenarios of the car, it is proposed to rely on support vector machines for classification so as to predict the possible scenarios before metamodeling each of them separately
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Mazzoli, Cecilia. "Sistemi tecnologici innovativi di involucro per il recupero del patrimonio edilizio recente : l’edilizia scolastica nel comune di Bologna." Thesis, Paris Est, 2015. http://www.theses.fr/2015PEST1082/document.
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Le projet de doctorat vise à présenter une nouvelle approche intégrée en support des opérateurs dans la gestion du processus de conception d'interventions de rénovation énergétique et architecturale du patrimoine bâti récent, grâce à l'emploie de solutions technologiques d'enveloppe innovantes. La recherche se fonde sur la collection d'un répertoire sélectionné des solutions architecturales et constructives d'enveloppe, nécessaire pour constituer une base valide sur laquelle étudier des solutions technologiques novatrices pour la réhabilitation énergétique des écoles dans l'après-guerre, en béton armé, généralement préfabriquées. Le projet identifie des processus constructifs éco-durables pour la conception des composants de façade “active”, adaptable et efficace, à assembler à sec, en conformité avec les exigences de performance requises par la réglementation actuelle. La recherche est finalisée à la gestion de l'ensemble du processus, soutenu par des systèmes de relevé géométrique, connectés aux logiciels de programmation paramétrique pour la modélisation des surfaces capables de s'adapter aux différentes morphologies du patrimoine existant. Ces outils informatisés CAO-FAO sont reliés aux machines à contrôle numérique CNC pour la fabrication des éléments de façade “sur mesure”. À démonstration de l'approche innovante proposée, deux possibles solutions d'enveloppes ont présentées, dans la ligne droit des principes de durabilité, comprise comme modularité, rapidité de mise en œuvre, réversibilité, récupération et réutilise des matériaux. En particulier, les solutions innovantes sont réunies par l'application d'une technique basée sur l'assemblage d'éléments préfabriqués, l'adoption d'un pavage hexagonal pour le dessin de la nouvelle surface d'enveloppe, et l'utilisation du même matériau isolant thermique, plastique et inorganique, recyclé, éco-durable, à faible impact environnemental (AAM - Alkali Activated Materials).Les solutions proposées, développées dans les sièges de cotutelle (Université de Bologne, Université Paris-Est) sont envisagées selon un protocole scientifique qui prévoit: conception du système constructif, analyse mécanique et thermique, expérimentation constructive, validation des techniques de mise en œuvre et des performancesThe research is aimed at presenting a new integrated approach to aid operators and designers to manage the design process as a whole in refurbishment interventions of recent existing building stock, through the use of innovative technological envelope solutions. The study requires the acquisition of a selection of typological and constructive envelope solutions, as a starting point for the development of design solutions to be used for architectural renovation of schools built after the Second World War, in reinforced concrete and mostly prefabricated. The project identifies sustainable construction processes for the design of “active”, adaptive, efficient and dry assembled envelope components, in accordance with the performance requirements prescribed by current regulations. The purpose of the research is to manage the whole design process with the support of geometrical survey, connected to parametric programming software for modelling surfaces which can be adapted to the morphology of existing buildings. These computerized CAD-CAM tools are connected to CNC machines for “customized” industrialized production. To illustrate this innovative approach, two envelope solutions are proposed, according to the research paradigms and the principles of sustainability, meant as modularity, speed of setup, reversibility, recycling and reuse of materials with low environmental impact. In particular, the innovative solutions have in common the application of a technique based on the assembly of prefabricated components, the adoption of hexagonal patterns for the tessellation of the new surface of the façade, and the use of the same plastic and inorganic, recycled and sustainable, thermal insulation material (AAM-Alkali Activated Materials).The design solutions proposed are developed at the two sites involved in the joint
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Badyal, Rajeev. "VLSI implementation of adaptive BIT/serial IIR filters." Thesis, 1992. http://hdl.handle.net/1957/36521.
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A new structure for the implementation of bit/serial adaptive IIR filter is
presented. The bit level system consists of gated full adders for the arithmetic
unit and data latches for the data path. This approach allows recursive
operation of the IIR filter to be implemented without any global
interconnections, minimal delay time, chip area and I/O pins. The
coefficients of the filter can be updated serially in real time for time invariant
and adaptive filtering. A fourth order bit/serial IIR filter is implemented on a
2 micron CMOS technology clocked at 55 MHz.Graduation date: 1992