Dissertations / Theses on the topic 'Scalable modeling and control'
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Jordan, Philip [Verfasser]. "Scalable Modelling of Aircraft Environmental Control Systems / Philip Jordan." München : Verlag Dr. Hut, 2019. http://d-nb.info/118151441X/34.
Kumar, Vibhore. "Enabling scalable self-management for enterprise-scale systems." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24788.
Committee Chair: Schwan, Karsten; Committee Member: Cooper, Brian F.; Committee Member: Feamster, Nick; Committee Member: Liu, Ling; Committee Member: Sahai, Akhil.
Chuku, Ejike E. "Security and Performance Engineering of Scalable Cognitive Radio Networks. Sensing, Performance and Security Modelling and Analysis of ’Optimal’ Trade-offs for Detection of Attacks and Congestion Control in Scalable Cognitive Radio Networks." Thesis, University of Bradford, 2019. http://hdl.handle.net/10454/18448.
May, Brian 1975. "Scalable access control." Monash University, School of Computer Science and Software, 2001. http://arrow.monash.edu.au/hdl/1959.1/8043.
Aroua, Ayoub. "Mise à l'échelle des entraînements électromécaniques pour la conception au niveau système dans les premières phases de développement des véhicules électriques." Electronic Thesis or Diss., Université de Lille (2022-....), 2023. http://www.theses.fr/2023ULILN042.
The automotive industry is required to accelerate the development and deployment of electrified vehicles at a faster pace than ever, to align the transportation sector with the climate goals. Reducing the development time of electric vehicles becomes an urgent priority. On the other hand, the industry is challenged by the increasing complexity and large design space of the emerging electrified powertrains. The existing approaches to address component design, such as numerical methods exemplified by finite element method, computational fluid dynamic, etc., are based on a detailed design process. This leads to a long computational burden when trying to incorporate them at system-level. Speeding up the early development phases of electrified vehicles necessitates new methodologies and tools, supporting the exploration of the system-level design space. These methodologies should allow for assessing different sizing choices of electrified powertrains in the early development phases, both efficiently in terms of computational time and with reliable results in terms of energy consumption at system-level. To address this challenge, this Ph.D. thesis aims to develop a scaling methodology for electric axles, allowing system-level investigation of different power-rated electric vehicles. The electric axle considered in this thesis comprises a voltage source inverter, an electric machine, a gearbox, and a control unit. The scaling procedure is aimed at predicting the data of a newly defined design of a given component with different specifications based on a reference design, without redoing time and effort-consuming steps. For this purpose, different derivations of scaling laws of the electric axle components are thoroughly discussed and compared at component-level in terms of power loss scaling. A particular emphasis is placed on examining the linear losses-to-power scaling method, which is widely employed in system-level studies. This is because, this method presents questionable assumptions, and has not been the subject of a comprehensive examination. A key contribution of the presented work is the derivation of power loss scaling laws of gearboxes, which has been identified as a gap in the current literature. This is achieved through an intensive experimental campaign using commercial gearboxes. To incorporate the scaling laws at system-level and study the interaction between the scaled components, the energetic macroscopic representation formalism is employed. The novelty of the proposed method lies in structuring a scalable model and control for a reference electric axle to be used in system-level simulation. The novel organization consists of a reference model and control complemented by two power adaptation elements at the electrical and mechanical sides. These latter elements consider the scaling effects, including the power losses. The methodology is applied for different study cases of battery electric vehicles, ranging from light to heavy-duty vehicles. Particular attention is paid to assessing the impact of the linear power-to-losses scaling method on the energy consumption considering different power scaling factors and driving cycles, as compared to high-fidelity scaling methods
TUCCI, MICHELE. "Scalable control of islanded microgrids." Doctoral thesis, Università degli studi di Pavia, 2018. http://hdl.handle.net/11571/1214890.
In the recent years, the increasing penetration of renewable energy sources has motivated a growing interest for microgrids, energy networks composed of interconnected Distributed Generation Units (DGUs) and loads. Microgrids are self-sustained electric systems that can operate either connected to the main grid or detached from it. In this thesis, we focus on the latter case, thus dealing with the so-called Islanded microGrids (ImGs). We propose scalable control design methodologies for both AC and DC ImGs, allowing DGUs and loads to be connected in general topologies and enter/leave the network over time. In order to ensure safe and reliable operations, we mirror the flexibility of ImGs structures in their primary and secondary control layers. Notably, off-line control design hinges on Plug-and-Play (PnP) synthesis, meaning that the computation of individual regulators is complemented by local optimization-based tests for denying dangerous plug-in/out requests. The solutions presented in this work aim to address some of the key challenges arising in control of AC and DC ImGs, while overcoming the limitations of the existing approaches. More precisely, this thesis comprises the following main contributions: (i) the development of decentralized primary control schemes for load-connected networks (i.e. where local loads appear only at the output terminals of each DGU) ensuring voltage stability in DC ImGs, and voltage and frequency stability in AC ImGs. In contrast with the most commonly used control strategies available in the literature, our regulators guarantee offset-free tracking of reference signals. Moreover, the proposed primary local controllers can be designed or updated on-the-fly when DGUs are plugged in/out, and the closed-loop stability of the ImG is always preserved. (ii) Novel approximate network reduction methods for handling totally general interconnections of DGUs and loads in AC ImGs. We study and exploit Kron reduction in order to derive an equivalent load-connected model of the original ImG, and designing stabilizing voltage and frequency regulators, independently of the ImG topology. (iii) Distributed secondary control schemes, built on top of primary layers, for accurate reactive power sharing in AC ImGs, and current sharing and voltage balancing in DC ImGs. In the latter case, we prove that the desired coordinated behaviors are achieved in a stable fashion and we describe how to design secondary regulators in a PnP manner when DGUs are added/removed to/from the network. (iv) Theoretical results are validated through extensive simulations, and some of the proposed design algorithms have been successfully tested on real ImG platforms.
Liu, Xin. "Scalable online simulation for modeling grid dynamics /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2004. http://wwwlib.umi.com/cr/ucsd/fullcit?p3158471.
Gramsamer, Ferdinand. "Scalable flow control for interconnection networks /." [Zürich] : [Institut für Technische Informatik und Kommunikationsnetze TIK, ETH Zürich], 2003. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=15020.
Gevros, Panagiotis. "Congestion control mechanisms for scalable bandwidth sharing." Thesis, University College London (University of London), 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249696.
Roman, Alexandru Bogdan. "Scalable cross-layer wireless medium access control." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609506.
Santiago, Alexandre José Batista. "HEVC scalable analysis : performance and bitrate control." Master's thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/21689.
Esta dissertação apresenta um estudo da norma de codificação de vídeo de alta eficiência (HEVC) e a sua extensão para vídeo escalável, SHVC. A norma de vídeo SHVC proporciona um melhor desempenho quando codifica várias camadas em simultâneo do que quando se usa o codificador HEVC numa configuração simulcast. Ambos os codificadores de referência, tanto para a camada base como para a camada superior usam o mesmo modelo de controlo de débito, modelo R-λ, que foi otimizado para o HEVC. Nenhuma otimização de alocação de débito entre camadas foi até ao momento proposto para o modelo de testes (SHM 8) para a escalabilidade do HEVC (SHVC). Derivamos um novo modelo R-λ apropriado para a camada superior e para o caso de escalabilidade espacial, que conduziu a um ganho de BD-débito de 1,81% e de BD-PSNR de 0,025 em relação ao modelo de débito-distorção existente no SHM do SHVC. Todavia, mostrou-se também nesta dissertação que o proposto modelo de R-λ não deve ser usado na camada inferior (camada base) no SHVC e por conseguinte no HEVC.
This dissertation provides a study of the High Efficiency Video Coding standard (HEVC) and its scalable extension, SHVC. The SHVC provides a better performance when encoding several layers simultaneously than using an HEVC encoder in a simulcast configuration. Both reference encoders, in the base layer and in the enhancement layer use the same rate control model, R-λ model, which was optimized for HEVC. No optimal bitrate partitioning amongst layers is proposed in scalable HEVC (SHVC) test model (SHM 8). We derived a new R-λ model for the enhancement layer and for the spatial case which led to a DB-rate gain of 1.81% and DB-PSNR gain of 0.025 in relation to the rate-distortion model of SHM-SHVC. Nevertheless, we also show in this dissertation that the proposed model of R-λ should not be used neither in the base layer nor in HEVC.
Bourki, Amine. "Towards scalable, multi-view urban modeling using structure priors." Thesis, Paris Est, 2017. http://www.theses.fr/2017PESC1062/document.
In this thesis, we address the problem of 3D reconstruction from a sequence of calibrated street-level photographs with a simultaneous focus on scalability and the use of structure priors in Multi-View Stereo (MVS).While both aspects have been studied broadly, existing scalable MVS approaches do not handle well the ubiquitous structural regularities, yet simple, of man-made environments. On the other hand, structure-aware 3D reconstruction methods are slow and scale poorly with the size of the input sequences and/or may even require additional restrictive information. The goal of this thesis is to reconcile scalability and structure awareness within common MVS grounds using soft, generic priors which encourage : (i) piecewise planarity, (ii) alignment of objects boundaries with image gradients and (iii) with vanishing directions (VDs), and (iv) objects co-planarity. To do so, we present the novel “Patchwork Stereo” framework which integrates photometric stereo from a handful of wide-baseline views and a sparse 3D point cloud combining robust 3D plane extraction and top-down image partitioning from a unified 2D-3D analysis in a principled Markov Random Field energy minimization. We evaluate our contributions quantitatively and qualitatively on challenging urban datasets and illustrate results which are at least on par with state-of-the-art methods in terms of geometric structure, but achieved in several orders of magnitude faster paving the way for photo-realistic city-scale modeling
Biatek, Thibaud. "Efficient rate control strategies for scalable video coding." Thesis, Rennes, INSA, 2016. http://www.theses.fr/2016ISAR0007/document.
High Efficiency Video Coding (HEVC/H.265) is the latest video coding standard, finalized in Janua1y 2013 as the successor of Advanced Video Coding (AVC/H.264). Its scalable extension, called SHVC was released in October 2014 and enables spatial, bitdepth, color-gamut (CGS) and even standard scalability. SHVC is a good candidate for introducing new services thanks to backward compatibility features with legacy HEVC receivers through the base-layer (BL) stream and next generation ones through the BL+EL (enhancement layer). In addition, SHVC saves substantial bitrate with respect to simulcast coding (independent coding of layers) and is also considered by DVB for UHD introduction and included in ATSC-3 .0. In this context, the work of this thesis aims at designing efficient rate-control strategies for HEVC and its scalable extension SHVC in the context of new UHD formats introduction. First, we have investigated the p-domain approach which consists in linking the number of non-zero transfonned and quantized residual coefficients with the bitrate, in a linear way, to achieve straightforward rate-control. After validating it in the context of HEVC and SHVC codings, we have developed an innovative Coding Tree Unit (CTU)-level rate-control algorithm using the p-domain. For each CTU and its associated targeted bit rate, our method accurately estimates the most appropriate quantization parameter (QP) based on neighborhood indicators, with a bit rate error below 4%. Then, we have proposed a deterministic way of estimating the p-domain model which avoids the implementation of look-up tables. The proposed method enables accurate model estimation over 90%. Second, we have explored the impact of the bitrate ratio between layers on the SHVC performance for the spatial, CGS and SDR-to-HDR scalability. Based on statistical observations, we have built an adaptive rate control algorithms (ARC). We have first proposed an ARC scheme which optimizes coding performance by selecting the optimal ratio into a fixed ratio inte1val, under a global bitrate instruction (BL+EL). This method is adaptive and considers the content and the type of scalability. This first approach enables a coding gain of 4.25% compared to fixed-ratio encoding. Then, this method has been enhanced with quality and bandwidth constraints in each layer instead of considering a fixed interval. This second method has been tested on hybrid delivery of HD/UHD services and backward compatible SHVC encoding of UHDI -PI /UHDI -P2 services (DVB use-case) where it enables significant coding gains of 7.51% and 8.30%, respectively. Finally, the statistical multiplexing of SHVC programs has been investigated. We have proposed a first approach which adjusts both the global bit rate to allocate in each program and the ratio between BL and EL to optimize the coding performance. In addition, the proposed method smooths the quality variations and enforces the quality homogeneity between programs. This method has been applied to a database containing pre-encoded bitstreams and enables an overhead reduction from 11.01% to 7.65% compared to constant bitrate encoding, while maintaining a good accuracy and an acceptable quality variations among programs
Wang, Zhikui. "Congestion control with scalable stability analysis and implementation /." Diss., Restricted to subscribing institutions, 2004. http://proquest.umi.com/pqdweb?did=828453671&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.
Dai, Min. "Rate-distortion analysis and traffic modeling of scalable video coders." Texas A&M University, 2004. http://hdl.handle.net/1969.1/3143.
Mansour, Hassan Bader. "Modeling of scalable video content for multi-user wireless transmission." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/12550.
Wachtel, Amanda M. (Amanda Marie). "A scalable methodology for modeling cities as systems of systems." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/82418.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 144-146).
As cities evolve in size and complexity, their component systems become more interconnected. Comprehensive modeling and simulation is needed to capture interactions and correctly assess the impact of changes. This thesis presents a methodology for modeling cities from a systems of systems perspective. The framework supplies general modeling guidelines and key steps. Also addressed are the importance of stakeholder interactions, creating the model structure, using smart city sensor data, and applying the methodology to larger, traditional cities. As an initial step, four city modeling including CityNet, CityOne, Sim City 4, and SoSAT software programs were evaluated from both a user and mathematical perspective. From the assessments, a list was developed of features critical to successful city modeling software including visualization, a streamlined user interface, accurate mathematics, the ability to specify systems and attributes, and the ability to model interconnections between systems. SoSAT was selected as the modeling tool for the case study, which involved modeling the Army's Base Camp Integration Laboratory. A model of the camp's baseline configuration was built and the camp was simulated for 30 days with results recorded at one hour intervals. 100 trials were run with averaged results presented by time intervals and for the total simulation time. Results were presented at all levels of structural aggregation. Two sensitivity analyses were conducted to analyze the impact of maintenance personnel and the frequency of potable water deliveries. Adding or subtracting a maintenance person impacted the availability of the generator systems that were being serviced, in turn impacting the performance of the micro grid. Extending the time between deliveries by 24 and 48 hours revealed two systems experienced resource depletions. Lastly, two technology insertions cases were conducted to assess the impact of adding a laundry water reuse system (LWRS) and a solar powered hot water heater (SHWH). The LWRS provided 70% of the laundry system's water needs, significantly reducing dependency upon deliveries. The SHWH was expected to decrease electricity consumption and increase fuel consumption. However, the reduction in energy demand meant fewer generators were needed to power the micro grid and both electricity and fuel consumption decreased.
by Amanda M. Wachtel.
S.M.
Li, Yuliang. "Congestion control for scalable video transmission over IP networks." Thesis, University of Bristol, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.441312.
Jarratt, Marie Claire. "Readout and Control: Scalable Techniques for Quantum Information Processing." Thesis, The University of Sydney, 2019. https://hdl.handle.net/2123/21572.
Zhang, Yueping. "Stable and scalable congestion control for high-speed heterogeneous networks." Diss., Texas A&M University, 2008. http://hdl.handle.net/1969.1/85909.
Casas, Escoda Adrià. "An Erlang Implementation of a Scalable Node B Control Unit." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-37235.
Li, Ming. "Resource discovery and fair intelligent admission control over scalable Internet /." Electronic version, 2004. http://adt.lib.uts.edu.au/public/adt-NTSM20050314.180037/index.html.
Zhang, Zhixiong. "Scalable role & organization based access control and its administration." Fairfax, VA : George Mason University, 2008. http://hdl.handle.net/1920/3110.
Vita: p. 121. Thesis directors: Ravi S. Sandhu, Daniel Menascé. Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Information Technology. Title from PDF t.p. (viewed July 7, 2008). Includes bibliographical references (p. 113-120). Also issued in print.
Bischof, Jonathan Michael. "Interpretable and Scalable Bayesian Models for Advertising and Text." Thesis, Harvard University, 2014. http://dissertations.umi.com/gsas.harvard:11400.
Statistics
Utermöhlen, Fabian [Verfasser]. "Modeling of MEMS Microbolometers : A Physics-Based Scalable Compact Model / Fabian Utermöhlen." Aachen : Shaker, 2015. http://d-nb.info/1070151580/34.
Rusert, Thomas [Verfasser]. "Distortion Modeling for Rate-Constrained Optimization of Scalable Video Coding / Thomas Rusert." Aachen : Shaker, 2007. http://d-nb.info/1164340301/34.
Behrens, Diogo, Marco Serafini, Sergei Arnautov, Flavio Junqueira, and Christof Fetzer. "Scalable error isolation for distributed systems: modeling, correctness proofs, and additional experiments." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-203622.
Chang, Hung-Ching. "Measuring, modeling, and optimizing counterintuitive performance phenomena in power-scalable, parallel systems." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/51682.
Ph. D.
Behrens, Diogo, Marco Serafini, Sergei Arnautov, Flavio Junqueira, and Christof Fetzer. "Scalable error isolation for distributed systems: modeling, correctness proofs, and additional experiments." Technische Universität Dresden, 2015. https://tud.qucosa.de/id/qucosa%3A29539.
Sjöberg, Bilstrup Katrin. "Predictable and Scalable Medium Access Control for Vehicular Ad Hoc Networks." Licentiate thesis, Halmstad University, Embedded Systems (CERES), 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-5482.
This licentiate thesis work investigates two medium access control (MAC) methods, when used in traffic safety applications over vehicular ad hoc networks (VANETs). The MAC methods are carrier sense multiple access (CSMA), as specified by the leading standard for VANETs IEEE 802.11p, and self-organizing time-division multiple access (STDMA) as used by the leading standard for transponders on ships. All vehicles in traffic safety applications periodically broadcast cooperative awareness messages (CAMs). The CAM based data traffic implies requirements on a predictable, fair and scalable medium access mechanism. The investigated performance measures are channel access delay, number of consecutive packet drops and the distance between concurrently transmitting nodes. Performance is evaluated by computer simulations of a highway scenario in which all vehicles broadcast CAMs with different update rates and packet lengths. The obtained results show that nodes in a CSMA system can experience unbounded channel access delays and further that there is a significant difference between the best case and worst case channel access delay that a node could experience. In addition, with CSMA there is a very high probability that several concurrently transmitting nodes are located close to each other. This occurs when nodes start their listening periods at the same time or when nodes choose the same backoff value, which results in nodes starting to transmit at the same time instant. The CSMA algorithm is therefore both unpredictable and unfair besides the fact that it scales badly for broadcasted CAMs. STDMA, on the other hand, will always grant channel access for all packets before a predetermined time, regardless of the number of competing nodes. Therefore, the STDMA algorithm is predictable and fair. STDMA, using parameter settings that have been adapted to the vehicular environment, is shown to outperform CSMA when considering the performance measure distance between concurrently transmitting nodes. In CSMA the distance between concurrent transmissions is random, whereas STDMA uses the side information from the CAMs to properly schedule concurrent transmissions in space. The price paid for the superior performance of STDMA is the required network synchronization through a global navigation satellite system, e.g., GPS. That aside since STDMA was shown to be scalable, predictable and fair; it is an excellent candidate for use in VANETs when complex communication requirements from traffic safety applications should be met.
Liu, Guanglei. "Management and Control of Scalable and Resilient Next-Generation Optical Networks." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/14610.
Liu, Yang. "Distributed Algorithms for Consensus and Formation Control in Scalable Robotic Swarms." Case Western Reserve University School of Graduate Studies / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=case1528376075213318.
Zhang, Xuan. "Scalable (re)design frameworks for optimal, distributed control in power networks." Thesis, University of Oxford, 2015. http://ora.ox.ac.uk/objects/uuid:4121ae7d-d505-4d3d-8ea6-49efeb9ba048.
Müller, Paul [Verfasser], and Karlheinz [Akademischer Betreuer] Meier. "Modeling and Verification for a Scalable Neuromorphic Substrate / Paul Müller ; Betreuer: Karlheinz Meier." Heidelberg : Universitätsbibliothek Heidelberg, 2017. http://d-nb.info/1177688875/34.
Yang, Weiwei. "Towards Scalable Nanomanufacturing: Modeling the Interaction of Charged Droplets from Electrospray using GPU." Master's thesis, University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5583.
M.S.M.E.
Masters
Mechanical and Aerospace Engineering
Engineering and Computer Science
Mechanical Engineering; Thermofluids
Petrosyan, Vahan. "Fast, Robust and Scalable Clustering Algorithms with Applications in Computer Vision." Licentiate thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-238512.
Den här avhandlingen behandlar en rad utmaningar inom klusteranalys. Till att börja med undersöker vi ett av de äldsta och mest utmanande problemen: att bestämma antalet kluster k utifrån data. Vi föreslår en ny algoritm som, till skillnad från tidigare algoritmer, ger antalet kluster (samt själva klustren) från enbart en körning. (Tidigare algoritmer kräver att dessa algoritmer körs flera gånger för olika värden på k, eller från olika startpunkter för samma värde på k.) Den andra utmaningen vi behandlar är hur de idag vanligast förekommande klusteringsalgoritmerna (e.g., spektral-, EM-baserad-, samt k-means-klustering) bör initialiseras. Vi föreslår en initialiseringsmetod, och demonstrerar i numeriska simulationer att denna ger signifikant bättre resultat jämfört med de nuvarande bästa metoderna. Som tredje del i avhandlingen studerar vi konstruktionen av mått på parvis likhet mellan datapunkter. En matris bestående av sådana likheter ligger till grund för många klusteringsalgoritmer, samt metoder för oövervakad inlärning inom maskininlärning. Mer specifikt så demonstrerar vi hur en likhetstransformation kan tillämpas på ett givet likhetsmått för att främja likhet mellan datapunkter inom samma kluster och undertrycka likhet för punkter som ligger i områden där kluster överlappar. Transformationen vi föreslår är speciellt lämpad för klusterings- och dimensionsreduceringsalgoritmer, vilket vi demonstrerar i omfattande numeriska experiment. Till sist studerar vi tillämpningar av klusteringsalgoritmer på bild- och videodata. Vi föreslår en segmenteringsalgoritm med signifikant bättre prestanda än de nuvarande bästa algoritmerna; både i termer av beräkningskomplexitet samt precision. Vidare så utvecklar vi en mjukvara baserad på vår algoritm för snabb och precis bildsegmentering. Våra studier visar att bildsegmentering och -annotering kan utföras upp till 20 gånger snabbare än med nuvarande mjukvaror, utan att vi kompromissar på kvalit´en. Detta pekar mot stora möjligheter att snabba upp många applikationer inom datorseende, eftersom segmenterad bilddata ligger till grund som träningsdata för många algoritmer.
Harnischmacher, Gerrit. "Block structured modeling for control /." Düsseldorf : VDI-Verl, 2007. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=016244726&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Claflin, Robert Alan. "Modeling control in computer simulations." Thesis, Monterey, California. Naval Postgraduate School, 1994. http://hdl.handle.net/10945/30927.
Pais, Gabriel Dias. "Order book modeling and control." Instituto Tecnológico de Aeronáutica, 2012. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=2209.
Young, Vinson. "Hardware-assisted security: bloom cache – scalable low-overhead control flow integrity checking." Thesis, Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/53994.
Ho, Qirong. "Modeling Large Social Networks in Context." Research Showcase @ CMU, 2014. http://repository.cmu.edu/dissertations/543.
Wu, Tao. "Off-network control processing for scalable routing in very large sensor networks." Diss., Connect to online resource - MSU authorized users, 2008.
Seagraves, Andrew Nathan. "A scalable computational approach for modeling dynamic fracture of brittle solids in three dimensions." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/62997.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 133-140).
In this thesis a new parallel computational method is proposed for modeling threedimensional dynamic fracture of brittle solids. The method is based on a combination of the discontinuous Galerkin (DG) formulation of the continuum elastodynamic problem with Cohesive Zone Models (CZM) of fracture. In the proposed framework, discontinuous displacement jumps are allowed to occur at all element boundaries in the pre-fracture regime in a manner similar to "intrinsic" cohesive element methods. However, owing to the DG framework, consistency and stability of the finite element solution are guaranteed prior to fracture. This in stark contrast to the intrinsic cohesive element methods which suffer wave propagation and stability issues as a result of allowing discontinuous displacement jumps in the pre-fracture regime without properly accounting for them in the weak statement of the problem. In the new method, a fracture criterion is evaluated at all element boundaries throughout the calculation and upon satisfaction of this criterion, cracks are allowed to nucleate and propagate in the finite element mesh, governed by a cohesive tractionseparation law (TSL). This aspect of the method is similar to existing "extrinsic" cohesive element methods which introduce new fracture surfaces in the mesh through the adaptive insertion of cohesive elements subsequent to the onset of fracture. Typically this requires the mesh topology to be modified on-the-fly, a process which is highly complex and hinders the scalability of parallel implementations. However, for the DG method, discontinuities exist at element boundaries from the start of the calculation and so modifications of the mesh topology are unnecessary for introducing new fracture surfaces. As a result, the parallel computational framework is highly scalable and algorithmically simple. In this thesis, the formulation and numerical implementation of the method is described in detail. The method is then applied to simulate two practical problems. First a ceramic spall test is simulated. In this example, the DG method is shown to accurately capture the propagation of longitudinal elastic waves and the formation of a spall plane. Mesh dependency of the predicted spall plane and the dissipated cohesive energy is investigated for refined meshes resolving the size of the fracture process zone and the results are shown to be highly mesh-sensitive for the range of mesh sizes used. The spall test is also simulated using an existing intrinsic cohesive approach which is shown to alter the propagation of elastic stress waves, leading to the spurious result that no spallation occurs. In a second numerical example, the proposed DG method is applied to simulate high-velocity impact of an unconfined ceramic plate with a rigid spherical projectile. The method is shown to capture some of the basic fundamental aspects of the impact response of unconfined ceramics including the formation of conical and radial cracking patterns.
by Andrew Nathan Seagraves.
S.M.
Agbi, Clarence. "Scalable and Robust Designs of Model - Based Control Strategies for Energy - Efficient Buildings." Research Showcase @ CMU, 2014. http://repository.cmu.edu/dissertations/333.
Li, Dong. "Scalable and Energy Efficient Execution Methods for Multicore Systems." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/26098.
Ph. D.
Helal, Ahmed Elmohamadi Mohamed. "Automated Runtime Analysis and Adaptation for Scalable Heterogeneous Computing." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/96607.
Doctor of Philosophy
Current supercomputers integrate a massive number of heterogeneous compute units with varying speed, computational throughput, memory bandwidth, and memory access latency. This trend represents a major challenge to end users, as their applications have been designed from the ground up to primarily exploit homogeneous CPUs. While heterogeneous systems can deliver several orders of magnitude speedup compared to traditional CPU-based systems, end users need extensive software and hardware expertise as well as significant time and effort to efficiently utilize all the available compute resources. To streamline such a daunting process, this dissertation presents automated frameworks for analyzing and modeling the performance on parallel architectures and for transforming the execution of user applications at runtime. The proposed frameworks incorporate domain knowledge and adapt to the input data and the underlying hardware using novel static and dynamic analyses. The experimental results show the efficacy of the introduced frameworks across many important application domains, such as computational fluid dynamics (CFD), and computer-aided design (CAD). In particular, the adaptive execution approach on heterogeneous systems achieves up to an order-of-magnitude speedup over the optimized parallel implementations.
Blanpain, Yannick. "A scalable and deployable approach for achieving fair rate allocation in high speed networks." Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/14868.
Fitje, Tryggve. "Monetary macroeconomic modeling, simulation and control." Thesis, Norwegian University of Science and Technology, Department of Engineering Cybernetics, 2008. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-10416.
In this report a dynamic macroeconomic model is built in an incremental manner. The economic units are built on an understandable tank analogy that can be described with the use of first order differential equations. The units are realised in the form of block diagrams in Mathworks Simulink®. Simulink block diagrams gives an explicit mathematical formulation of the model, thereby making all the equations, the model consists of, readily available. The economys ability to service debt in different settings is tested. The first part of this model is kept simple, so as to make it understandable to people with different backgrounds. Then model realism gets increased priority, but still it is considered vital for the usefulness of the model that the reader truly understands it. However, the fundamental point of the thesis is made before model complexity should become an issue. The foundation for the thesis, which is the work of Trond Andresen is represented in an oral manner, with simple mathematics at the base. The model is built by adding new elements to the model throughout the report, giving an understanding of the individual parts of the model, before they are merged together and the complexity increase. A system that models economic mood is implemented, which has an amplifying effect on the current trend in the economy, and adds new dynamics because of its lag to the actual state of the economy. Real economy deposits are implemented as a counterweight to the financial sectors loan issuing. Insolvency in both the real economy and the financial sector is implemented. They both make up balancing loops, setting limits on real economy earnings on deposits, as well as banks earnings on issued loans. They both also prevent the model from displaying impossible dynamics under extreme conditions. Banks lending is limited by capital requirement, set by the bank of international settlements, BIS. An regulating agent is also implemented, to guide the economy and keep it on track. It imposes a reserve requirement on the financial sector, which it makes the bank sector uphold through open market operations. Finally a stock market with innate oscillations , developed by Trond Andresen, is implemented in the model. It is not connected to the economy via vessel dynamics, rather it influence the economy through the implemented mood system. This makes the economy more less robust, and induces oscillations in to the economy in otherwise static settings. The economy appear as very fragile, just minor variations in interest rates makes for large fluctuations in the debt burden. The model exhibits path dependence. Minor changes in parameters makes the economy lock into states from which it does not recover. Modelling dynamic systems, especially nontechnical is an imperfect try and fail science. The model will always contain flaws and shortcomings. The best we can do is try to minimize the flaws in the elements that are important for answering the questions we want answered.
Reite, Karl Johan. "Modeling and Control of Trawl Systems." Doctoral thesis, Norwegian University of Science and Technology, Department of Marine Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-1706.
This thesis is motivated by the possible benefits of a more precise trawl control system with respect to both environmental impact and fishing efficiency. It considers how the control performance of a pelagic trawl system can be improved, partly by introducing a control architecture tailor-made for the trawl system subject to industrial requirements, and partly by developing a trawl door control concept.
A mathematical model of the trawl system is developed, including an accurate model of the hydrodynamic forces on the trawl doors. This model estimates both the steady state and the transient forces on trawl doors moving in six degrees of freedom. The steady state hydrodynamic forces are based on wind tunnel experiments. To estimate the transient forces, a software code based on potential theory is developed. This software estimates the time-dependency of the forces from circulation about the foil, the angular damping forces, and the forces from relative accelerations between the fluid and the trawl door.
Various concepts for trawl door control are evaluated. This is done both analytically, by simulations and by towing tank experiments. Based on the results, a new trawl door control concept is proposed. The trawl door control concept is developed to fulfill the demands on both energy consumption, robustness and control performance. Because of the contradictory demands on performance, stability and energy efficiency, the control concept is improved using numerical optimization. The optimization is based on timedomain simulations of the trawl system.
The design of an overall trawl control architecture taking advantage of the trawl door control system is presented. This takes industrial constraints into account, such as the energy supply on the trawl doors. The control system is based on model predictive control and facilitates complex objectives, constraints and process models. The use of model predictive control is made possible by letting PID plant controllers act as a layer between the model predictive controller and the trawl system. The model predictive controller is thus able to operate on a stable and predictable system with no fast dynamics. To reduce the energy consumption of the trawl door, conventional feedback control is avoided on this part of the control system, and step wise feedforward control is instead employed.
The main contributions in this work are the mathematical modeling of the hydrodynamic forces on a trawl door, the design of a control architecture tailor-made for trawl system control and the method for optimization of the trawl door control concept.
Agi, Egemen. "Mathematical Modeling Of Gate Control Theory." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12611468/index.pdf.