Relevant bibliographies by topics / Simultaneous optimisation

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Academic literature on the topic 'Simultaneous optimisation'

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Published: 19 February 2023

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Journal articles on the topic "Simultaneous optimisation"

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Bansal, V., J. D. Perkins, E. N. Pistikopoulos, R. Ross, and J. M. G. van Schijndel. "Simultaneous design and control optimisation under uncertainty." Computers & Chemical Engineering 24, no. 2-7 (July 2000): 261–66. http://dx.doi.org/10.1016/s0098-1354(00)00475-0.

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Bliss, P. J., E. R. Ostarcevic, and A. A. Potter. "Process optimisation for simultaneous biological nitrification and chemical phosphorus removal." Water Science and Technology 29, no. 12 (December 1, 1994): 107–15. http://dx.doi.org/10.2166/wst.1994.0591.

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Environmental regulations require sewage treatment plants originally designed for BOD and suspended solids removal to meet increasingly stringent effluent ammonia and total phosphorus standards. Operating a biological nitrification process in parallel with chemical phosphorus removal to achieve consistent effluent concentrations less than 1mg/L was successfully achieved through process optimisation. An optimisation program was developed and implemented which effectively allowed the combination of two essentially conflicting processes to produce high quality effluent. The process optimisation program utilised a structured approach to identify process deficiencies which reduced treatment capacity and reliability. Accurate identification of process deficiencies enabled appropriate solutions to be developed and implemented. Additional monitoring quantified improvements arising from process modifications or revised operating procedures. The average effluent ammonia concentration between June and September 1990 was 23.8mg/L. This was reduced to 0.6mg/L after optimisation in October 1992. The standard deviation of 3.4mg/L during the baseline monitoring program between February and April 1992 was reduced to 0.4mg/L after optimisation, at much lower mixed liquor temperatures. Similarly, the average effluent phosphorus concentration was reduced from 1.1mg/L with a standard deviation of 0.8mg/L to an average value of 0.6mg/L with a standard deviation of 0.3mg/L. Understanding process operations, combined with the ability to identify process deficiencies resulting from poor operating practices and environmental conditions, reduces the risk of generating poor effluent quality. The performance of any treatment process can derive significant benefits by implementing an effective process optimisation program. This work established that reliable process performance is possible, provided that process deficiencies are identified, and appropriate solutions are implemented and evaluated.
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Caivano, R., A. Tridello, D. Paolino, and G. Chiandussi. "Topology and fibre orientation simultaneous optimisation: A design methodology for fibre-reinforced composite components." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 234, no. 9 (June 18, 2020): 1267–79. http://dx.doi.org/10.1177/1464420720934142.

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Additive manufacturing for fibre-reinforced composite structures is rapidly diffusing, since it enables the production of lightweight structural parts characterized by complex geometries and tailored fibre orientations. Therefore, the development of design methodologies capable to simultaneously optimize the shape of the fibre-reinforced composite part and the fibre orientation in the additive manufacturing process is, at present, of utmost interest among industries and research centres. In this paper, a novel simultaneous optimisation method capable to optimise the topology and the local fibre orientation is proposed. The method is computationally cheap, fast convergent and permits to avoid stress peaks, working efficiently on 2D and on 3D models. The analytical formulation of the problem and the optimisation algorithm are at first described. The optimisation criteria are based on the uniform strain energy density distribution and the fibre alignement along the principal stress direction. The proposed method is then verified with several benchmarks from the literature and with a 3D illustrative example, confirming that it can be effectively and efficiently employed for the optimisation of composite components to be produced through additive manufacturing.
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Kok, Ka Yee, Hieng Ho Lau, Thanh Duoc Phan, and TIina Chui Huon Ting. "Design optimisation for cold-formed steel residential roof truss using genetic algorithm." World Journal of Engineering 15, no. 5 (October 1, 2018): 575–83. http://dx.doi.org/10.1108/wje-10-2017-0322.

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Purpose This paper aims to present the design optimisation using genetic algorithm (GA) to achieve the highest strength to weight (S/W) ratio, for cold-formed steel residential roof truss. Design/methodology/approach The GA developed in this research simultaneously optimises roof pitch, truss configurations, joint coordinates and applied loading of typical dual-pitched symmetrical residential roof truss. The residential roof truss was considered with incremental uniform distributed loading, in both gravitational and uplift directions. The structural analyses of trusses were executed in this GA using finite element toolbox. The ultimate strength and serviceability of trusses were checked through the design formulation implemented in GA, according to the Australian standard, AS/NZS 4600 Cold-formed Steel Structures. Findings An optimum double-Fink roof truss which possess highest S/W ratio using GA was determined, with optimum roof pitch of 15°. The optimised roof truss is suitable for industrial application with its higher S/W ratio and cost-effectiveness. The combined methodology of multi-level optimisation and simultaneous optimisation developed in this research could determine optimum roof truss with consistent S/W ratio, although with huge GA search space. Research limitations/implications The sizing of roof truss member is not optimised in this paper. Only single type of cold-formed steel section is used throughout the whole optimisation. The design of truss connection is not considered in this paper. The corresponding connection costs are not included in the proposed optimisation. Practical implications The optimum roof truss presented in this paper is suitable for industrial application with higher S/W ratio and lower cost, in either gravitational or uplift loading configurations. Originality/value This research demonstrates the approaches in combining multi-level optimisation and simultaneous optimisation to handle large number of variables and hence executed an efficient design optimisation. The GA designed in this research determines the optimum residential roof truss with highest S/W ratio, instead of lightest truss weight in previous studies.
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Tovar, Andres, Nelson Arzola de la Peña, and Alexander Gómez Cassab. "Multidisciplinary design optimisation techniques." Ingeniería e Investigación 27, no. 1 (January 1, 2007): 84–92. http://dx.doi.org/10.15446/ing.investig.v27n1.14785.

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Design optimisation of a multidisciplinary project in engineering involves the decomposition of a system into disciplines and the subsequent association of their contributions. This work was aimed at presenting the most common decomposition and association techniques currently used in multidisciplinary design optimisation (MDO). Amongst the decomposition techniques this work includes hierarchical and non-hierarchical approaches as well as the most popular numerical procedures. The association techniques include: one-level methods (e.g. all-at-once optimisation and simultaneous analysis and design), multilevel methods (e.g. concurrent subspace optimisation and collaborative optimisation) and robust design. This work also incorporates an illustrative numerical example.
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Mahmoudi, Salah, Ezzeddine Srasra, and Fouad Zargouni. "SIMULTANEOUS OPTIMISATION OF DRYING PARAMETERS OF CERAMIC BODIES." American Journal of Geoscience 4, no. 1 (January 1, 2014): 1–7. http://dx.doi.org/10.3844/ajgsp.2014.1.7.

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Oke, Doris, Thokozani Majozi, Rajib Mukherjee, Debalina Sengupta, and Mahmoud El-Halwagi. "Simultaneous Energy and Water Optimisation in Shale Exploration." Processes 6, no. 7 (July 6, 2018): 86. http://dx.doi.org/10.3390/pr6070086.

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Lu, A., G. Stenz, H. Eisenmann, and F. M. Johannes. "Technology mapping for simultaneous gate and interconnect optimisation." IEE Proceedings - Computers and Digital Techniques 146, no. 1 (1999): 21. http://dx.doi.org/10.1049/ip-cdt:19990245.

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John, Boby, and Pooja Mansharamani. "An application of fuzzy optimisation methodology for simultaneous optimisation of continuous and categorical characteristics." International Journal of Quality Engineering and Technology 7, no. 3 (2019): 298. http://dx.doi.org/10.1504/ijqet.2019.104885.

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Zhang, Qingxia, Łukasz Jankowski, and Zhongdong Duan. "Simultaneous Identification of Moving Vehicles and Bridge Damages Considering Road Rough Surface." Mathematical Problems in Engineering 2013 (2013): 1–12. http://dx.doi.org/10.1155/2013/963424.

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A method for the simultaneous identification of moving vehicles and the damages of the supporting structure from measured responses is presented. A two-axle vehicle model with two degrees of freedom (DOF) is adopted. The extent of the damage and the vehicle parameters were chosen as the optimisation variables, which allow ill conditioning to be avoided and decrease the number of sensors required. The identification is performed by minimising the distance between the measured responses and the computed responses to given optimisation variables. The virtual distortion method (VDM) was used, such that the response of the damaged structure can be computed from comparison with the intact structure subjected to the same vehicle excitation and to the response-coupled virtual distortions. These are related to the optimisation variables by the system impulse response matrix and are expressed by a linear system, which allowed both types of optimisation variables to be treated in a unified way. The numerical cost is reduced by using a moving influence matrix. The adjoint variable method is used for fast sensitivity analysis. A three-span bridge numerical example is presented, where the identification was verified with 5% root mean square (RMS) measurement, and model, error whilst also considering the surface roughness of the road.
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Dissertations / Theses on the topic "Simultaneous optimisation"

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Almeida, Silva Salvado D. S. "SPECT system design optimisation for a simultaneous SPECT/MRI clinical scanner." Thesis, University College London (University of London), 2017. http://discovery.ucl.ac.uk/1564701/.

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The aim of this project was to optimize the design of a Single Photon Emission Computed Tomography (SPECT) insert based on high-resolution detectors and a high-sensitivity collimator, for a Magnetic Resonance Imaging (MRI) scanner, in order to perform simultaneous human brain SPECT/MRI and improve radionuclide-based therapies for glioma patients. The radionuclides of interest are 99mTc, 111In and 123I. Specific emphasis was given to the collimator and overall system design, data simulation and performance assessment, which would feed directly into the European-funded INSERT project. The SPECT insert was to consist of a stationary system with SiPM-based photodetectors, insensitive to magnetic fields. Regarding the design, a number of system and collimator geometries were evaluated considering the restricted space in the MRI bore and the limited angular sampling. High sensitivity was prioritised over high spatial resolution, because of the clinical application. Gamma shielding design was also addressed. Analytical calculations of system sensitivity and resolution, in addition to Monte Carlo simulations, were performed to compare various slit-slat and pinhole collimator designs. A new collimator design was proposed: multi-mini-slit slit-slat (MSS) collimator. The MSS has multiple mini-slits, some of which are shared between adjacent detectors, and they are embedded in the slat component, allowing for longer slats in comparison to a standard slit-slat collimator. The MSS design demonstrated to have the best overall performance, and the final system design consisted of a partial ring with 20 detectors. A framework for geometrical calibration of the system was developed and assessed, utilising a single prototype detector equipped with a prototype collimator. This framework takes advantage of the specific collimator design to estimate geometrical parameters from independent measurements of calibration phantoms. Experimental evaluation with tomographic acquisition of phantoms demonstrated the applicability of the new collimation concept, confirming the superiority of the MSS design over equivalent pinhole collimation.
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Khambalia, Hussein. "Peri-operative assessment and optimisation in simultaneous pancreas and kidney transplantation." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/perioperative-assessment-and-optimisation-in-simultaneous-pancreas-and-kidney-transplantation(c5b7d3b0-4ddc-4189-8579-244682eea7ec).html.

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Pancreas transplantation (PT) is considered a gold-standard cure for brittle insulin dependent diabetes mellitus. In over 90% of cases, this is conducted simultaneously with a kidney transplant, providing concurrent treatment for end-stage renal failure (Simultaneous pancreas and kidney transplantation, SPKT). However, since its inception in the 1960’s, SPKT has been associated with considerable morbidity and mortality. Despite significant recent improvements in graft and patient survival, the multi-factorial nature of the procedure has resulted in persistently high peri-operative morbidity. This thesis has identified four areas to study in the peri-operative assessment and management of these patients, potentially resulting in improved clinical outcomes. 1. Pre-operative risk-prediction scoring systems aide in the consent process and the peri-operative planning of care following major surgery. In PT, multi-system risk-prediction tools are deficient. We therefore assessed the utility of commonly used general surgical risk prediction models in PT recipients. Our finding suggested that The Waterlow Score, a multi-system tool originally developed for predicting the development of decubitus skin ulcers, identified high-risk individuals and has value in predicting outcome following SPKT.2. Peri-operative physiological optimisation (Goal-directed therapy, GDT) is well-recognised to improve outcomes following major general surgery in high-risk individuals. A randomised controlled trial was therefore performed to investigate the benefits of GDT in the peri-operative period following SPKT. The findings demonstrated improved short-term outcomes following GDT in our cohort.3. The temporal evolution of biomarkers following major physiological stresses allow for application in the diagnosis, management surveillance and treatment of diseases. In our cohort the acute evolution of inflammatory and diabetes biomarkers were delineated and correlated to clinical outcome. We identified that cold ischaemic time is significantly negatively related to early pancreatic function and CRP provides an easily measurable predictor of recipient morbidity.4. The final study aimed to evaluate the feasibility and assess the benefits of contrast enhanced ultrasound (CEUS) in the immediate post-operative period following PT. We found CEUS to be a clinically useful adjunct in the post-operative assessment of allograft morphology and perfusion, although further validation and correlation with outcomes is required.
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Munro, Dirk Pieter. "Topology optimisation and simultaneous analysis and design : material penalisation and local stress constraints." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86679.

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Thesis (MEng)--Stellenbosch University, 2014.
ENGLISH ABSTRACT: We investigate the simultaneous analysis and design (SAND) formulation of the topology optimisation problem. The characteristics of the formulation are presented considering the simple compliance/weight constrained problem and the more complex local stress constrained case. The problems are solved in an efficient sparse sequential approximate optimisation (SAO) framework with the SAND formulation showing an significant reduction in computational requirements compared to the traditional and inherently expensive nested analysis and design (NAND) approach. In SAND the state equations are included in the optimisation problem as a set of equality constraints and not solved exactly in each iteration, as would be the case in NAND. Decision and state variables are thus independent, resulting in an immensely sparse optimisation problem. The availability of simple exact analytic expressions for all the constraint functions (via the finite element method) allows for the construction of accurate approximate subproblems with little computational effort. Furthermore, material can be removed completely from the design domain with few complications, resulting in a decrease in subproblem size as the algorithm progresses, further reducing computation time. The inclusion of void material in the design domain leads to the formulation of stress constraints as so-called ‘vanishing’ constraints. Furthermore, the SAND formulation provides a new perspective on the infamous singularity problem. Amongst other results, we present some test cases that seem to scale linearly in computational requirements for a specific range of problem sizes.
AFRIKAANSE OPSOMMING: Die formulering van die topologie optimerings probleem as ’n gelyktydige analise en ontwerp (simultaneous analysis and design (SAND)) formulering word ondersoek. Die eienskappe van die formulering word bespreek in die konteks van die eenvoudig begrensde styfheid/gewig geval en die meer komplekse plaaslike spanning begrensde geval. Die probleme word opgelos in ’n sekwenti¨ele benaderde optimering (SBO; sequential approximate optimisation (SAO)) raamwerk met die SAND formulering, wat lei tot ’n wesenlike vermindering in berekenings vereistes benodig in vergelyking met die tradisionele en inherente duur geneste analise en ontwerp (nested analysis and design (NAND)) geval. In SAND word die vergelykings wat die respons van die struktuur beskryf met gelykheidsbegrensings in die optimerings probleem verteenwoordig. Die respons van die struktuur word dus nie presies opgelos in elke iterasie nie, soos in die geval van NAND wel gebeur. Alle optimerings veranderlikes is dus onafhanklik en lei tot ’n baie yl optimerings probleem. Deur middel van die eindige element metode is die analitiese vorm van alle begrensings beskikbaar en kan dit gebruik word om akkurate benaderde subprobleme op te stel sonder ekstra berekenings koste. Verder kan materiaal heeltemal verwyder uit van die ontwerpsgebied met weinig komplikasies. Dit lei tot ’n verkleining van subprobleme soos die algoritme vordering maak wat berekenings tyd nog meer verminder. Die feit dat materiaal heeltemal verwyder kan word van die ontwerp gebied lei tot die formulering van spannings begrensings as sogenaamde ‘verdwynende’ begrensings. Verder gee die SAND formulering ’n nuwe uitsig op die bekende singulariteitsprobleem. Met verskeie ander resultate word daar ook gewys dat dit voorkom of ’n spesifieke stel toetsprobleme lineˆer skaal in berekenings tyd.
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Frost, Duncan. "Long range monocular SLAM." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:af38cfa6-fc0a-48ab-b919-63c440ae8774.

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This thesis explores approaches to two problems in the frame-rate computation of a priori unknown 3D scene structure and camera pose using a single camera, or monocular simultaneous localisation and mapping. The thesis reflects two trends in vision in general and structure from motion in particular: (i) the move from directly recovered and towards learnt geometry; and (ii) the sparsification of otherwise dense direct methods. The first contributions mitigate scale drift. Beyond the inevitable accumulation of random error, monocular SLAM accumulates error via the depth/speed scaling ambiguity. Three solutions are investigated. The first detects objects of known class and size using fixed descriptors, and incorporates their measurements in the 3D map. Experiments using databases with ground truth show that metric accuracy can be restored over kilometre distances; and similar gains are made using a hand-held camera. Our second method avoids explicit feature choice, instead employing a deep convolutional neural network to yield depth priors. Relative depths are learnt well, but absolute depths less so, and recourse to database-wide scaling is investigated. The third approach uses a novel trained network to infer speed from imagery. The second part of the thesis develops sparsified direct methods for monocular SLAM. The first contribution is a novel camera tracker operating directly using affine image warping, but on patches around sparse corners. Camera pose is recovered with an accuracy at least equal to the state of the art, while requiring only half the computational time. The second introduces a least squares adjustment to sparsified direct map refinement, again using patches from sparse corners. The accuracy of its 3D structure estimation is compared with that from the widely used method of depth filtering. It is found empirically that the new method's accuracy is often higher than that of its filtering counterpart, but that the method is more troubled by occlusion.
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Poline, Marie. "Contribution aux méthodes de conception et de gestion des systèmes énergétiques multi-sources par optimisation systémique : application aux trains hybrides électrique autonomes." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAT099/document.

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En France, il existe deux modes de traction pour les trains : la traction diesel ou la traction électrique. Chaque mode fait face à des problématiques qui lui sont propres. Dans le cas du diesel, les émissions de gaz à effet de serre étant de plus en plus contrôlées, il devient nécessaire de faire évoluer ce type de train vers une solution moins polluante. Dans le cas de la traction électrique, la consommation d’énergie entraine une chute de tension qui peut imposer un ralentissement des trains, empêchant ainsi le développement du trafic. La solution étudiée par la SNCF est l’hybridation des trains (ajout de systèmes de stockage en embarqué).Ces travaux de thèse ont pour objectif de mettre en place une méthode permettant de faire le pré-dimensionnement des systèmes de stockage embarqués dans le train. De plus, afin de tenir compte de l’influence réciproque de la gestion sur le dimensionnement, celle-ci est incluse dans le modèle de dimensionnement. La résolution du modèle global se fait à l’aide d’un algorithme d’optimisation.La méthode a été mise en place sur les deux modes de traction ferroviaire (diesel et électrique) et l’optimisation a été faite avec l’algorithme SQP (Sequential Quadratic Programming)
In France, there are two traction modes for railway: the diesel and electric traction. Each mode has its own issues. For diesel, the increasing control of the greenhouse gas emissions imposes to evolve this type of train to a less polluting solution. For electric traction, the energy consumption creates a voltage drop which can cause a traffic slowdown, which will limit the traffic development. The studied solution by SNCF is the hybridization of the train (adding storage system).Thus, these works have the objective to build a method to do the pre-sizing of storage systems embedded in trains. Moreover, to take into account the mutual influence of the sizing and the energy management, this last one is included in the sizing model. An optimization algorithm solves the global model.The method has been developed for the two traction modes (diesel and electric) and the optimization has been made with SQP algorithm (Sequential Quadratic Programming)
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Galea, Michelle. "Fuzzy rules from ant-inspired computation." Thesis, University of Edinburgh, 2007. http://hdl.handle.net/1842/2701.

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This research identifies and investigates major issues in inducing accurate and comprehensible fuzzy rules from datasets. A review of the current literature on fuzzy rulebase induction uncovers two significant issues: A. There is a tradeoff between inducing accurate fuzzy rules and inducing comprehensible fuzzy rules; and, B. A common strategy for the induction of fuzzy rulebases, that of iterative rule learning where the rules are generated one by one and independently of each other, may not be an optimal one. FRANTIC, a system that provides a framework for exploring the claims above is developed. At the core lies a mechanism for creating individual fuzzy rules. This is based on a significantly modified social insect-inspired heuristic for combinatorial optimisation -- Ant Colony Optimisation. The rule discovery mechanism is utilised in two very different strategies for the induction of a complete fuzzy rulebase: 1. The first follows the common iterative rule learning approach for the induction of crisp and fuzzy rules; 2. The second has been designed during this research explicitly for the induction of a fuzzy rulebase, and generates all rules in parallel. Both strategies have been tested on a number of classification problems, including medical diagnosis and industrial plant fault detection, and compared against other crisp or fuzzy induction algorithms that use more well-established approaches. The results challenge statement A above, by presenting evidence to show that one criterion need not be met at the expense of the other. This research also uncovers the cost that is paid -- that of computational expenditure -- and makes concrete suggestions on how this may be resolved. With regards to statement B, until now little or no evidence has been put forward to support or disprove the claim. The results of this research indicate that definite advantages are offered by the second simultaneous strategy, that are not offered by the iterative one. These benefits include improved accuracy over a wide range of values for several key system parameters. However, both approaches also fare well when compared to other learning algorithms. This latter fact is due to the rule discovery mechanism itself -- the adapted Ant Colony Optimisation algorithm -- which affords several additional advantages. These include a simple mechanism within the rule construction process that enables it to cope with datasets that have an imbalanced distribution between the classes, and another for controlling the amount of fit to the training data. In addition, several system parameters have been designed to be semi-autonomous so as to avoid unnecessary user intervention, and in future work the social insect metaphor may be exploited and extended further to enable it to deal with industrial-strength data mining issues involving large volumes of data, and distributed and/or heterogeneous databases.
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Meddeb, Mimouni Houda. "Contribution à la commande simultanée des systèmes linéaires." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0149/document.

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Dans ce mémoire, nous avons proposé une nouvelle approche pour la stabilisation des polytopes de systèmes SISO LTI avec un contrôleur d’ordre fixe. En utilisant le théorème des segments étendus, nous avons montré que, pour stabiliser un polytope de systèmes LTI, il suffit de stabiliser simultanément tous ses sommets en considérant une condition supplémentaire associée à ces derniers. Nous avons présenté également dans ce mémoire des méthodes originales pour la synthèse des contrôleurs simultanés en combinant les techniques polynomiales et l’optimisation linéaire. Avec les méthodes de synthèse proposées, nous avons montré non seulement que le contrôleur stabilise simultanément les sommets du polytope de systèmes (commande simultanée), mais également tous les systèmes appartenant au polytope (commande robuste). Il s’agit donc de contrôleur simultané et robuste pour les polytopes de systèmes. Avant de pouvoir énoncer des résultats concernant la commande simultanée de l’ensemble des segments d’un polytope de systèmes, nous avons étudié la commande d’un segment de systèmes avec un contrôleur LTI. Ce segment de systèmes est défini par les deux systèmes situés à chacune de ses extrémités et par un paramètre appartenant à un intervalle donné. La question de la stabilisation de cette classe de systèmes incertains a été formulée comme celle d’un problème de commande simultanée de deux systèmes situés aux extrémités avec une contrainte d’égalité des parties paires de chacun des deux polynômes caractéristiques en boucle fermée. Des conditions d’existence d’un régulateur stabilisant un segment de systèmes ont été données en utilisant deux critères de stabilité polynomiaux : le critère d’Hermite-Fujiwara et le critère d’Hermite-Biehler. Les résultats obtenus pour la commande simultanée d’un segment de systèmes ont été étendus à la stabilisation d’un polytope de systèmes. Ce problème a été réduit à la stabilisation des sommets du polytope avec un contrôleur simultané générant des polynômes caractéristiques en boucle fermée ayant la même partie paire (ou impaire). Des conditions d’existence de ces contrôleurs simultanés robustes d’ordre fixe sont données en utilisant les deux critères de stabilité mentionnés ci-dessus. Des algorithmes de synthèse sont également développés pour calculer ces régulateurs
In this manuscript, a new approach is proposed for the stabilization of polytopes of SISO LTI systems with a fixed order controller. Using the extended segment theorem, we have shown that to stabilize a polytope of LTI systems, it is sufficient to simultaneously stabilize all its vertices by considering an additional condition associated with them. In this paper, we have also presented original methods for the synthesis of simultaneous controllers by combining polynomial techniques and linear optimization. With the proposed synthesis methods, we have shown not only that the controller simultaneously stabilizes the vertices of the system polytope (simultaneous control), but also all systems belonging to the polytope (robust control). It is therefore a simultaneous and robust controller for system polytopes. Before stating results concerning the simultaneous control of all the segments of a polytope of systems, we have studied the control of a segment of systems with an LTI controller. This segment of systems is defined by the two systems located at each of its ends and by a parameter belonging to a given interval. The question of the stabilization of this class of uncertain systems has been formulated as that of a problem of simultaneous control of two systems located at the ends with an equal constraint of the even parts of each of the two characteristic polynomials in closed loop. Conditions of existence of a stabilizing controller for a segment of systems have been given using two polynomial stability criteria : the Hermite-Fujiwara criterion and the Hermite-Biehler criterion. The results obtained for the simultaneous control of a segment of systems have been extended to the stabilization of a polytope of systems. This problem has been reduced to the stabilization of the vertices of the polytope with a simultaneous controller generating closed loop characteristic polynomials having the same even (or odd) part. The existence conditions of these robust, fixed-order and simultaneous controllers are given using the two stability criteria mentioned above. Synthesis algorithms are also developed to design these controllers
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Chen, Zhouye. "Reconstruction of enhanced ultrasound images from compressed measurements." Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30222/document.

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L'intérêt de l'échantillonnage compressé dans l'imagerie ultrasonore a été récemment évalué largement par plusieurs équipes de recherche. Suite aux différentes configurations d'application, il a été démontré que les données RF peuvent être reconstituées à partir d'un faible nombre de mesures et / ou en utilisant un nombre réduit d'émission d'impulsions ultrasonores. Selon le modèle de l'échantillonnage compressé, la résolution des images ultrasonores reconstruites à partir des mesures compressées dépend principalement de trois aspects: la configuration d'acquisition, c.à.d. l'incohérence de la matrice d'échantillonnage, la régularisation de l'image, c.à.d. l'a priori de parcimonie et la technique d'optimisation. Nous nous sommes concentrés principalement sur les deux derniers aspects dans cette thèse. Néanmoins, la résolution spatiale d'image RF, le contraste et le rapport signal sur bruit dépendent de la bande passante limitée du transducteur d'imagerie et du phénomène physique lié à la propagation des ondes ultrasonores. Pour surmonter ces limitations, plusieurs techniques de traitement d'image en fonction de déconvolution ont été proposées pour améliorer les images ultrasonores. Dans cette thèse, nous proposons d'abord un nouveau cadre de travail pour l'imagerie ultrasonore, nommé déconvolution compressée, pour combiner l'échantillonnage compressé et la déconvolution. Exploitant une formulation unifiée du modèle d'acquisition directe, combinant des projections aléatoires et une convolution 2D avec une réponse impulsionnelle spatialement invariante, l'avantage de ce cadre de travail est la réduction du volume de données et l'amélioration de la qualité de l'image. Une méthode d'optimisation basée sur l'algorithme des directions alternées est ensuite proposée pour inverser le modèle linéaire, en incluant deux termes de régularisation exprimant la parcimonie des images RF dans une base donnée et l'hypothèse statistique gaussienne généralisée sur les fonctions de réflectivité des tissus. Nous améliorons les résultats ensuite par la méthode basée sur l'algorithme des directions simultanées. Les deux algorithmes sont évalués sur des données simulées et des données in vivo. Avec les techniques de régularisation, une nouvelle approche basée sur la minimisation alternée est finalement développée pour estimer conjointement les fonctions de réflectivité des tissus et la réponse impulsionnelle. Une investigation préliminaire est effectuée sur des données simulées
The interest of compressive sampling in ultrasound imaging has been recently extensively evaluated by several research teams. Following the different application setups, it has been shown that the RF data may be reconstructed from a small number of measurements and/or using a reduced number of ultrasound pulse emissions. According to the model of compressive sampling, the resolution of reconstructed ultrasound images from compressed measurements mainly depends on three aspects: the acquisition setup, i.e. the incoherence of the sampling matrix, the image regularization, i.e. the sparsity prior, and the optimization technique. We mainly focused on the last two aspects in this thesis. Nevertheless, RF image spatial resolution, contrast and signal to noise ratio are affected by the limited bandwidth of the imaging transducer and the physical phenomenon related to Ultrasound wave propagation. To overcome these limitations, several deconvolution-based image processing techniques have been proposed to enhance the ultrasound images. In this thesis, we first propose a novel framework for Ultrasound imaging, named compressive deconvolution, to combine the compressive sampling and deconvolution. Exploiting an unified formulation of the direct acquisition model, combining random projections and 2D convolution with a spatially invariant point spread function, the benefit of this framework is the joint data volume reduction and image quality improvement. An optimization method based on the Alternating Direction Method of Multipliers is then proposed to invert the linear model, including two regularization terms expressing the sparsity of the RF images in a given basis and the generalized Gaussian statistical assumption on tissue reflectivity functions. It is improved afterwards by the method based on the Simultaneous Direction Method of Multipliers. Both algorithms are evaluated on simulated and in vivo data. With regularization techniques, a novel approach based on Alternating Minimization is finally developed to jointly estimate the tissue reflectivity function and the point spread function. A preliminary investigation is made on simulated data
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Swiha, Stéphanie. "Optimisation du suivi de l'exposition aux hydrocarbures aromatiques polycycliques pendant la grossesse avec le développement et la validation de méthodes analytiques et biologiques Analysis of polycyclic aromatic hydrocarbons in human biological samples Development of an analytical method for the simultaneous quantitation of 24 regulated Polycyclic Aromatic Hydrocarbons (PAHs) in maternal and umbilical cord sera Validation of the analytical procedure for the determination of 22 regulated polycyclic aromatic hydrocarbons in maternal and umbilical cord sera." Thesis, Sorbonne Paris Cité, 2019. http://www.theses.fr/2019USPCB020.

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Les Hydrocarbures Aromatiques Polycycliques (HAP) sont principalement émis par les activités humaines et représentent l'un des principaux groupes de polluants dans l'air, les sols, les eaux et les aliments. Par conséquent, ils font l'objet d'une surveillance atmosphérique, et alimentaire. Cette étude s'attache au cas particulier de la femme enceinte et son fœtus. En effet, l'exposition pendant la grossesse est à l'origine de malformations fœtales, de prématurité et de troubles pouvant survenir ensuite chez l'enfant mais aussi chez l'adulte. À ce jour, seuls quelques HAP réglementés par l'environnement ont été recherchés et quantifiés dans le sang maternel ou le sang de cordon ombilical. De plus, les données sur les performances analytiques sont souvent manquantes. Ainsi ce projet vise pour la première fois en France à développer et valider des méthodes analytiques et biologiques pour la surveillance de l'exposition aux HAP durant la grossesse. Dans une première partie, la quantification simultanée des 24 HAP réglementés dans les sérums de sang maternel et de sang de cordon ombilical a été développée. Tout d'abord, l'analyse des 24 HAP par chromatographie en phase liquide et par détections UV et fluorescence (HPLC-UV-FD) et par chromatographie en phase gazeuse couplée à la spectrométrie de masse (GC-MS) a été optimisée. Le prétraitement des échantillons de sérum a ensuite été développé. La précipitation des protéines présentes dans le sérum a été optimisée avec un plan d'expérience afin d'interrompre toutes les interactions entre les protéines et les HAP. Un protocole d'extraction sur phase solide (SPE), avec un supportt à base de silice greffée C18, a ensuite été optimisé pour extraire et concentrer les HAP. Pour améliorer les facteurs d'enrichissement, les fractions d'élution de SPE ont ensuite été évaporées et 2 approches ont été évaluées: une évaporation totale ou partielle (méthode "dernière goutte"). Le protocole analytique final impliquant la préparation d'échantillon suivi par l'analyse en HPLC-UV-FD ou GC-MS a été validé avec succès à partir d'un mélange de sérums maternels dopés et un mélange de sérums dopés provenant de sangs de cordons ombilicaux avec l'approche des profils d'exactitude. Ensuite, des échantillons de sérum provenant de sang maternel et de sang de cordon ombilical ont été analysés par HPLC-UV-FD et GC-MS. Enfin, les méthodes analytiques développées précédemment ont été utilisées pour l'étude du transfert placentaire des HAP avec le modèle de perfusion du cotylédons humains ex vivo. Les perfusions ont été réalisées pour la première fois avec un mélange de 14 HAP (concentration totale : 1 microM) et leur transfert placentaire a été démontré. De plus, des cultures cellulaires de trophoblastes humains exposées avec ce mélange de 14 HAP (concentration totale : 1 microM) ont été réalisées pour évaluer l'impact de l'exposition aux HAP sur les fonctions placentaires. Le dysfonctionnement de certaines fonctions placentaires telles que la fusion et la différentiation des trophoblastes, les fonctions endocrines et les fonctions de détoxifications
Polycyclic Aromatic Hydrocarbons (PAHs) are mainly emitted by human activities and are one of the main pollutant groups in air, soils, waters, and food. Therefore, they are subject to atmospheric, environmental and food monitoring. This study focuses on the particular case of exposure of pregnant women and their fetus, which are at risks. Indeed, PAH exposure can lead to fetal malformations, prematurity and even disorders in children and adult. To date, only a few PAHs regulated by US-EPA were searched and quantified in maternal or umbilical cord blood. Moreover, analytical performance data are often lacking. Hence, this study aims for the first time in France, at developing analytical and biological methods for the monitoring of PAH exposure during pregnancy. In a first part, the simultaneous determination of the 24 regulated PAHs in sera from maternal and umbilical cord bloods was developed. First, the analysis of the 24 PAHs by liquid chromatography and UV and fluorescence detections (HPLC-UV-FD) and by gas chromatography hyphenated to mass spectrometry (GC-MS) were optimized. The sample pretreatment of the plasma samples was next developed. The precipitation of the proteins present in the plasma was optimized with a Design of Experiment to disrupt all the interactions between them and the PAHs. A solid phase extraction (SPE) protocol, with a C18-based sorbent, was next optimized to extract and concentrate the PAHs. To improve the enrichment factors, the elution SPE fractions were next evaporated and 2 approaches were evaluated: a total or a partial evaporation ("last drop" method). The final analytical protocol involving the sample pretreatment followed by HPLC-UV-FD or GC-MS was successfully validated with spiked pooled sera from maternal and umbilical cord bloods with the accuracy profile approach. Then, sera samples from maternal and umbilical cord bloods were analyzed by LC/UV-FD and GC/MS. Finally, the previously developed analytical methods were used for a study with the ex vivo human cotyledon perfusion model. Perfusions were carried out for the first time with a mix of 14 US-EPA PAHs and their placental transfer was demonstrated. In addition, human trophoblast cell cultures with 1 µM with 14 US-EPA PAHs were carried out to evaluate the impact of PAH exposure on placental functions. The dysfunction of certain placental functions such as trophoblast fusion and differentiation, endocrine functions and detoxification functions was demonstrated
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Oesterle, Jonathan. "Holistic approach to designing hybrid assembly lines A comparative study of Multi-Objective Algorithms for the Assembly Line Balancing and Equipment Selection Problem under consideration of Product Design Alternatives Evaluation of the influence of dominance rules for the assembly line design problem under consideration of product design alternatives Hybrid Multi-objective Optimization Method for Solving Simultaneously the line Balancing, Equipment and Buffer Sizing Problems for Hybrid Assembly Systems Comparison of Multiobjective Algorithms for the Assembly Line Balancing Design Problem Efficient multi-objective optimization method for the mixed-model-line assembly line design problem Detaillierungsgrad von Simulationsmodellen Rechnergestützte Austaktung einer Mixed-Model Line. Der Weg zur optimalen Austaktung." Thesis, Troyes, 2017. http://www.theses.fr/2017TROY0012.

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Le travail présenté dans cette thèse concerne la formulation et la résolution de deux problèmes d'optimisation multi-objectifs. Ces problèmes de décision, liés à une approche holistique, ont pour but de sélectionner la meilleure configuration « produit/ligne d’assemblage » à partir d'un ensemble de design produits, et de ressources. Concernant le premier problème, un modèle de coût a été développé afin de traduire les interdépendances complexes entre la sélection d’un design produit et les caractéristiques des ressources. Une étude empirique est proposée et vise à comparer, selon plusieurs indicateurs de qualité multi-objectifs, différentes méthodes de résolution - comprenant des algorithmes génétiques, de colonies de fourmis, d’optimisation par essaims particulaires, des chauves-souris, de recherche du coucou et de pollinisation des fleurs. Plusieurs règles de dominance et une recherche locale spécifique au problème ont été appliquées aux méthodes de résolution les plus prometteuses. Concernant le second problème, qui se penche également sur le dimensionnement des stocks tampons, les méthodes de résolution sont à un modèle de simulation à événements discrets, dont la fonction première est l’évaluation des valeurs des différentes fonctions objectives. L’approche holistique associée aux deux problèmes a été validée avec deux cas industriels
The work presented in this thesis concerns the formulation and the resolution of two holistic multi-objective optimization problems associated with the selection of the best product and hybrid assembly line configuration out of a set of products, processes and resources alternatives. Regarding the first problem, a cost model was developed in order to translate the complex interdependencies between the selection of specific product designs, processes and resources characteristics. An empirical study is proposed, which aimed at comparing, according to several multi-objective quality indicators, various resolution methods – including variants of evolutionary algorithms, ant colony optimization, particle swarm optimization, bat algorithms, cuckoo search algorithms, and flower-pollination algorithms. Several dominance rules and a problem-specific local search were applied to the most promising resolution methods. Regarding the second problem, which also considers the buffer sizing, the developed algorithms were enhanced with a genetic discrete-event simulation model, whose primary function is to evaluate the value of the various objective functions. The demonstration of the associated resolution frameworks for both problems was validated through two industrial-cases
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Books on the topic "Simultaneous optimisation"

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Bilow, Marcel, Tillmann Klein, and Ulrich Knaack. FAÇADES. 010 publishers, 2008. http://dx.doi.org/10.47982/bookrxiv.12.

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Façade technology of the 20th century is related to the dissolution of the massive wall into a separation of structure and façade. Looking at the development of façade technology, after 60 years of curtain wall systems, 30 years of element-façade systems and ten years of experience with the integration of environmental services in double façades, it can be concluded that the peak of optimisation has been reached. No further technical developments can be expected by continuing to apply extra layers for each additional technical function. Understanding façades - or better envelopes - as part of an integral building, we have to see that creating the future envelope has to be done on a ’network’ basis: employing systems - but also methods of thinking - which provide the possibility to develop different aspects simultaneously and combine them as required. The envelope has to be seen as a functional part of the entire building, serving a part of the demand by providing the necessary technologies and qualities. In this regard, we have to withdraw from material and structure-orientated thinking and construction – we have to develop the envelope as a hybrid system: materials, technologies and production processes have to be integrated into the summation and combined into an all-encompassing result. Façades comprise various themes covering strategic, material and technological developments. Aspects such as function integration, networking of elements, new structures and materials as well as the addition of functions to existing structures will be investigated and explained in 85 or so concrete ideas.
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Book chapters on the topic "Simultaneous optimisation"

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Villadiego, Harlem M. M., José Elías C. Arroyo, and André Gustavo dos Santos. "An Iterated Greedy Heuristic for Simultaneous Lot-Sizing and Scheduling Problem in Production Flow Shop Environments." In Evolutionary Computation in Combinatorial Optimisation, 61–72. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-662-44320-0_6.

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Goodfellow, R., and R. Dimitrakopoulos. "Stochastic Optimisation of Mineral Value Chains—Developments and Applications for the Simultaneous Optimisation of Mining Complexes with Uncertainty." In Advances in Applied Strategic Mine Planning, 707–23. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-69320-0_41.

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Kee, Chan Mieow, Wang Chan Chin, Tee Hoe Chun, and Nurul Adela Bukhari. "Optimisation and Prediction of Glucose Production from Oil Palm Trunk via Simultaneous Enzymatic Hydrolysis." In Intelligent Computing & Optimization, 55–64. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-93247-3_6.

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Pathak, Biswajit, Laura Young, and Hannah Smithson. "Simultaneous Optimisation of Confocal and Non-confocal Images in an AOSLO with a Reconfigurable Aperture Pattern." In Communications in Computer and Information Science, 410–19. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-52791-4_32.

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Starkey, A. J., H. Hagras, S. Shakya, and G. Owusu. "A Genetic Algorithm Based Approach for the Simultaneous Optimisation of Workforce Skill Sets and Team Allocation." In Research and Development in Intelligent Systems XXXIII, 253–66. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-47175-4_19.

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Humphreys, Joseph, Christopher Peers, Jun Li, Yuhui Wan, Jingcheng Sun, Robert Richardson, and Chengxu Zhou. "Teleoperating a Legged Manipulator Through Whole-Body Control." In Towards Autonomous Robotic Systems, 63–77. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-15908-4_6.

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AbstractIn this work, we present a highly functional teleoperation system, that integrates a full-body inertia-based motion capture suit and three intuitive teleoperation strategies with a Whole-Body Control (WBC) framework, for quadrupedal legged manipulators. This enables the realisation of commands from the teleoperator that would otherwise not be possible, as the framework is able to utilise DoF redundancy to meet several objectives simultaneously, such as locking the gripper frame in position while the trunk completes a task. This is achieved through the WBC framework featuring a defined optimisation problem that solves a range of Cartesian and joint space tasks, while subject to a set of constraints (e.g. halt constraints). These tasks and constraints are highly modular and can be configured dynamically, allowing the teleoperator to switch between teleoperation strategies seamlessly. The overall system has been tested and validated through a physics-based simulation and a hardware test, demonstrating all functionality of the system, which in turn has been used to evaluate its effectiveness.
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Tran, Binh, Bing Xue, and Mengjie Zhang. "Bare-Bone Particle Swarm Optimisation for Simultaneously Discretising and Selecting Features for High-Dimensional Classification." In Applications of Evolutionary Computation, 701–18. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-31204-0_45.

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Feng, Z., P. Gu, M. Zheng, X. Yan, and D. W. Bao. "Environmental Data-Driven Performance-Based Topological Optimisation for Morphology Evolution of Artificial Taihu Stone." In Proceedings of the 2021 DigitalFUTURES, 117–28. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-5983-6_11.

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AbstractTaihu stone is the most famous one among the top four stones in China. It is formed by the water's erosion in Taihu Lake for hundreds or even thousands of years. It has become a common ornamental stone in classical Chinese gardens because of its porous and intricate forms. At the same time, it has become a cultural symbol through thousands of years of history in China; later, people researched its spatial aesthetics; there are also some studies on its structural properties. For example, it has been found that the opening of Taihu stone caves has a steady-state effect which people develop its value in the theory of Poros City, Porosity in Architecture and some cultural symbols based on the original ornamental value of Taihu stone. This paper introduces a hybrid generative design method that integrates the Computational Fluid Dynamics (CFD) and Bi-directional Evolutionary Structural Optimization (BESO) techniques. Computational Fluid Dynamics (CFD) simulation enables architects and engineers to predict and optimise the performance of buildings and environment in the early stage of the design and topology optimisation techniques BESO has been widely used in structural design to evolve a structure from the full design domain towards an optimum by gradually removing inefficient material and adding materials simultaneously. This research aims to design the artificial Taihu stone based on the environmental data-driven performance feedback using the topological optimisation method. As traditional and historical ornament craftwork in China, the new artificial Taihu stone stimulates thinking about the new value and unique significance of the cultural symbol of Taihu stone in modern society. It proposes possibilities and reflections on exploring the related fields of Porosity in Architecture and Poros City from the perspective of structure.
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Wilson, J. A. "DYNAMIC MODEL BASED OPTIMISATION IN THE DESIGN OF A BATCH PROCESS INVOLVING SIMULTANEOUS REACTION AND DISTILLATION." In Process Optimisation, 163–81. Elsevier, 1987. http://dx.doi.org/10.1016/b978-0-85295-205-4.50018-9.

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"Simplified modelling of stiffened panels for simultaneous static and dynamic optimisation." In Research and Applications in Structural Engineering, Mechanics and Computation, 355–56. CRC Press, 2013. http://dx.doi.org/10.1201/b15963-165.

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Conference papers on the topic "Simultaneous optimisation"

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Mai, Sebastian, Christoph Steup, and Sanaz Mostaghim. "Simultaneous Localisation and Optimisation for Swarm Robotics." In 2018 IEEE Symposium Series on Computational Intelligence (SSCI). IEEE, 2018. http://dx.doi.org/10.1109/ssci.2018.8628767.

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Pearce, Michael. "Acquisition functions for simultaneous Bayesian optimisation of multiple problems." In 2017 Winter Simulation Conference (WSC). IEEE, 2017. http://dx.doi.org/10.1109/wsc.2017.8248233.

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Munkelt, Christoph, Andreas Breitbarth, Gunther Notni, and Joachim Denzler. "Multi-View Planning for Simultaneous Coverage and Accuracy Optimisation." In British Machine Vision Conference 2010. British Machine Vision Association, 2010. http://dx.doi.org/10.5244/c.24.118.

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Thurman, Edward, James Riordan, and Daniel Toal. "Automated Optimisation of Simultaneous Multibeam and Sidescan Sonar Seabed Mapping." In OCEANS 2007 - Europe. IEEE, 2007. http://dx.doi.org/10.1109/oceanse.2007.4302324.

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Senders, Walther, Marianne Kugler, and Louis Boves. "Simultaneous optimisation of several variables in a probabilistic language model." In First European Conference on Speech Communication and Technology (Eurospeech 1989). ISCA: ISCA, 1989. http://dx.doi.org/10.21437/eurospeech.1989-196.

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Lensen, Andrew, Bing Xue, and Mengjie Zhang. "Particle swarm optimisation representations for simultaneous clustering and feature selection." In 2016 IEEE Symposium Series on Computational Intelligence (SSCI). IEEE, 2016. http://dx.doi.org/10.1109/ssci.2016.7850124.

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Sham Mohd Sayuti, M. Norazizi. "Simultaneous Multi-Objective Optimisation for Low-Power Real-Time Networks-On-Chip." In 2018 4th International Conference on Electrical, Electronics and System Engineering (ICEESE). IEEE, 2018. http://dx.doi.org/10.1109/iceese.2018.8703596.

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Bascetta, Luca, and Alberto Leva. "Simultaneous optimisation of set point tracking and decoupling in autotuning multivariable regulators." In 2007 American Control Conference. IEEE, 2007. http://dx.doi.org/10.1109/acc.2007.4282369.

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El Dabee, Faraj, Romeo Marian, and Yousef Amer. "A simultaneous cost-risk reduction optimisation in JIT systems using genetic algorithms." In 2014 IEEE International Conference on Control System, Computing and Engineering (ICCSCE). IEEE, 2014. http://dx.doi.org/10.1109/iccsce.2014.7072694.

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Sayuti, M. Norazizi Sham Mohd, and Leandro Soares Indrusiak. "Simultaneous Optimisation of Task Mapping and Priority Assignment for Real-Time Embedded NoCs." In 2015 23rd Euromicro International Conference on Parallel, Distributed and Network-Based Processing (PDP). IEEE, 2015. http://dx.doi.org/10.1109/pdp.2015.84.

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