Dissertations / Theses on the topic 'Complex problems'
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Bukhkalo, S. I., and A. O. Ageicheva. "Complex projects development problems." Thesis, National Technical University "Kharkiv Polytechnic Institute", 2019. http://repository.kpi.kharkov.ua/handle/KhPI-Press/41490.
Full textWhitmer, Brian C. "Improving Spreadsheets for Complex Problems." Diss., CLICK HERE for online access, 2008. http://contentdm.lib.byu.edu/ETD/image/etd2361.pdf.
Full textPérez, Foguet Agustí. "Numerical modelling of complex geomechanical problems." Doctoral thesis, Universitat Politècnica de Catalunya, 2000. http://hdl.handle.net/10803/6703.
Full textLas principales aportaciones de la tesis son: el desarrollo de una formulación ALE para modelos hyperelastoplásticos y el cálculo de operadores tangentes para distintas leyes constitutivas y esquemas de integración temporal no triviales (uso de esquemas de derivación numérica, técnicas de subincrementación y modelos elastoplásticos con endurecimiento y/o reblandecimiento dependientes del trabajo plástico o la densidad). Se presentan diversas aplicaciones que muestran las principales características de los desarrollos presentados (análisis del ensayo del molinete para arcillas blandas, del ensayo triaxial para arenas, de la rotura bajo una cimentación, del proceso de estricción de una barra metálica circular y de un proceso de estampación en frío), dedicando una especial atención a los aspectos computacionales de la resolución de dichos problemas. Por último, se dedica un capítulo específico a la modelización y la simulación numérica de procesos de compactación fría de polvos metálicos y cerámicos.
Numerical modelling of problems involving geomaterials (i.e. soils, rocks, concrete and ceramics) has been an area of active research over the past few decades. This fact is probably due to three main causes: the increasing interest of predicting the material behaviour in practical engineering situations, the great change of computer capabilities and resources, and the growing interaction between computational mechanics, applied mathematics and different engineering fields (concrete, soil mechanics...). This thesis fits within this last multidisciplinary approach. Based on constitutive modelling and applied mathematics and using both languages the numerical simulation of some complex geomechanical problems has been studied.
The state of the art regarding experiments, constitutive modelling, and numerical simulations involving geomaterials is very extensive. The thesis focuses in three of the most important and actual ongoing research topics within this framework: 1) the treatment of large boundary displacements by means of Arbitrary Lagrangian-Eulerian (ALE) formulations; 2) the numerical solution of highly nonlinear systems of equations in solid mechanics; and 3) the constitutive modelling of the nonlinear mechanical behaviour of granular materials. The three topics have been analysed and different contributions for each one of them have been developed. Moreover, some of the new developments have been applied to the numerical modelling of cold compaction processes of powders. The process consists in transforming a loose powder into a compacted sample through a large volume reduction. This problem has been chosen as a reference application of the thesis because it involves large boundary displacements, finite deformations and highly nonlinear material behaviour. Therefore, it is a challenging geomechanical problem from a numerical modelling point of view.
The most relevant contributions of the thesis are the following: 1) with respect to the treatment of large boundary displacements: quasistatic and dynamic analyses of the vane test for soft materials using a fluid-based ALE formulation and different non-newtonian constitutive laws, and the development of a solid-based ALE formulation for finite strain hyperelastic-plastic models, with applications to isochoric and non-isochoric cases; 2) referent to the solution of nonlinear systems of equations in solid mechanics: the use of simple and robust numerical differentiation schemes for the computation of tangent operators, including examples with several non-trivial elastoplastic constitutive laws, and the development of consistent tangent operators for different substepping time-integration rules, with the application to an adaptive time-integration scheme; and 3) in the field of constitutive modelling of granular materials: the efficient numerical modelling of different problems involving elastoplastic models, including work hardening-softening models for small strain problems and density-dependent hyperelastic-plastic models in a large strain context, and robust and accurate simulations of several powder compaction processes, with detailed analysis of spatial density distributions and verification of the mass conservation principle.
Mohammed, Alip. "Boundary value problems of complex variables." [S.l. : s.n.], 2002. http://www.diss.fu-berlin.de/2003/23/index.html.
Full textKytmanov, Aleksandr, Simona Myslivets, Bert-Wolfgang Schulze, and Nikolai Tarkhanov. "Elliptic problems for the Dolbeault complex." Universität Potsdam, 2001. http://opus.kobv.de/ubp/volltexte/2008/2597/.
Full textMitchell, Helen Margaret. "Index policies for complex scheduling problems." Thesis, University of Newcastle Upon Tyne, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397534.
Full textMaidstone, Robert. "Efficient analysis of complex changepoint problems." Thesis, Lancaster University, 2016. http://eprints.lancs.ac.uk/83055/.
Full textHanna, S. "Addressing complex design problems through inductive learning." Thesis, University College London (University of London), 2012. http://discovery.ucl.ac.uk/1353781/.
Full textHarper, Courtney Christine. "Complex problems in peroxisome matrix protein import." Available to US Hopkins community, 2003. http://wwwlib.umi.com/dissertations/dlnow/3080674.
Full textViaud, Quentin. "Mathematical programming methods for complex cutting problems." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0350.
Full textThis thesis deals with a two-dimensional bin-packing problem with defects on bins from the glass industry. Cutting patterns have to be exact 4-stage guillotine and items defect-free. A standard way to solve it isto use Dantzig-Wolfe reformulation with column generation and branch-and price.This is impossible in our case due to large instance size. We first study and solve the defect-free pricing problem with an incremental labelling algorithm based on a dynamic program (DP), represented as a flow problem in a hypergraph. Our method is generic for guillotine knapsack problems but fails to solve large instance in a short amount of time. Instead we solve the defect freebin-packing problem with a DP and a diving heuristic. This DP generatesnon-proper columns, cutting patterns that cannot be in an integer solution.We adapt standard diving heuristic to this “non-proper” case while keeping itseffectiveness. We then extend the diving heuristic to deal with defects. Ourfirst proposal heuristically repairs a given defect-free solution. Secondly the defect-free diving heuristic is adjusted to handle defects during column fixing.Our industrial results outline the effectiveness of our methods
Turner, Stephen Richard. "The Role of Strategies in Complex Technology Problem Solving." Thesis, Griffith University, 2012. http://hdl.handle.net/10072/366076.
Full textThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Education and Professional Studies
Arts, Education and Law
Full Text
Otri, Sameh. "Improving the bees algorithm for complex optimisation problems." Thesis, Cardiff University, 2011. http://orca.cf.ac.uk/11568/.
Full textLiu, Wudong. "Evolutionary multiobjective optimisation for expensive and complex problems." Thesis, University of Essex, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.537937.
Full textBarr, Steven William. "An integrated approach to complex problems of organisations." Thesis, University of Bristol, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.768200.
Full textAbdollahi, Jafar. "Analysing Complex Oil Well Problems through Case-Based Reasoning." Doctoral thesis, Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, 2007. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-1702.
Full textThe history of oil well engineering applications has revealed that the frequent operational problems are still common in oil well practice. Well blowouts, stuck pipes, well leakages are examples of the repeated problems in the oil well engineering industry. The main reason why these unwanted problems are unavoidable can be the complexity and uncertainties of the oil well processes. Unforeseen problems happen again and again, because they are not fully predictable, which could be due to lack of sufficient data or improper modelling to simulate the real conditions in the process. Traditional mathematical models have not been able to totally eliminate unwanted oil well problems because of the many involved simplifications, uncertainties, and incomplete information. This research work proposes a new approach and breakthrough for overcoming these challenges. The main objective of this study is merging two scientific fields; artificial intelligence and petroleum engineering in order to implement a new methodology.
Case-Based Reasoning (CBR) and Model-Based Reasoning (MBR), two branches of the artificial intelligence science, are applied for solving complex oil well problems. There are many CBR and MBR modelling tools which are generally used for different applications for implementing and demonstrating CBR and MBR methodologies; however, in this study, the Creek system which combines CBR and MBR has been utilized as a framework. One specific challenging task related to oil well engineering has been selected to exemplify and examine the methodology. To select a correct candidate for this application was a challenging step by itself. After testing many different issues in the oil well engineering, a well integrity issue has been chosen for the context. Thus, 18 leaking wells, production and injection wells, from three different oil fields have been analysed in depth. Then, they have been encoded and stored as cases in an ontology model given the name Wellogy.
The challenges related to well integrity issues are a growing concern. Many oil wells have been reported with annulus gas leaks (called internal leaks) on the Norwegian Continental Shelf (NCS) area. Interventions to repair the leaking wells or closing and abandoning wells have led to: high operating cost, low overall oil recovery, and in some cases unsafe operation. The reasons why leakages occur can be different, and finding the causes is a very complex task. For gas lift and gas injection wells the integrity of the well is often compromised. As the pressure of the hydrocarbon reserves decreases, particularly in mature fields, the need for boosting increases. Gas is injected into the well either to lift the oil in the production well or to maintain pressure in the reservoir from the injection well. The challenge is that this gas can lead to breakdown of the well integrity and cause leakages. However, as there are many types of leakages that can occur and due to their complexity it can be hard to find the cause or causal relationships. For this purpose, a new methodology, the Creek tool, which combines CBR and MBR is applied to investigate the reasons for the leakages. Creek is basically a CBR system, but it also includes MBR methods.
In addition to the well integrity cases, two complex cases (knowledge-rich cases) within oil well engineering have also been studied and analysed through the research work which is part of the PhD. The goal here is to show how the knowledge stored in two cases can be extracted for the CBR application.
A model comprising general knowledge (well-known rules and theories) and specific knowledge (stored in cases) has been developed. The results of the Wellogy model show that the CBR methodology can automate reasoning in addition to human reasoning through solving complex and repeated oil well problems. Moreover, the methodology showed that the valuable knowledge gained through the solved cases can be sustained and whenever it is needed, it can be retrieved and reused. The model has been verified for unsolved cases by evaluating case-matching results. The model gives elaborated explanations of the unsolved cases through the building of causal relationships. The model also facilitates knowledge acquisition and learning curves through its growing case base.
The study showed that building a CBR model is a rather time-consuming process due to four reasons:
1. Finding appropriate cases for the CBR application is not straightforward
2. Challenges related to constructing cases when transforming reported information to symbolic entities
3. Lack of defined criteria for amount of information (number of findings) for cases
4. Incomplete data and information to fully describe problems of the cases at the knowledge level
In this study only 12 solved cases (knowledge-rich cases) have been built in the Wellogy model. More cases (typically hundreds for knowledge-lean cases and around 50 for knowledge-rich cases) would be required to have a robust and efficient CBR model. As the CBR methodology is a new approach for solving complex oil well problems (research and development phase), additional research work is necessary for both areas, i.e. developing CBR frameworks (user interfaces) and building CBR models (core of CBR). Feasibility studies should be performed for implemented CBR models in order to use them in real oil field operations. So far, the existing Wellogy model has showed some benefits in terms of; representing the knowledge of leaking well cases in the form of an ontology, retrieving solved cases, and reusing pervious cases.
Burkov, Andriy. "Leveraging Repeated Games for Solving Complex Multiagent Decision Problems." Thesis, Université Laval, 2011. http://www.theses.ulaval.ca/2011/28028/28028.pdf.
Full textMaking good decisions in multiagent environments is a hard problem in the sense that the presence of several decision makers implies conflicts of interests, a lack of coordination, and a multiplicity of possible decisions. If, then, the same decision makers interact continuously through time, they have to decide not only what to do in the present, but also how their present decisions may affect the behavior of the others in the future. Game theory is a mathematical tool that aims to model such interactions as strategic games of multiple players. Therefore, multiagent decision problems are often studied using game theory. In this context, and being restricted to dynamic games, complex multiagent decision problems can be algorithmically approached. The contribution of this thesis is three-fold. First, this thesis contributes an algorithmic framework for distributed planning in non-cooperative dynamic games. The multiplicity of possible plans is a matter of serious complications for any planning approach. We propose a novel approach based on the concept of learning in repeated games. Our approach permits overcoming the aforementioned complications by means of communication between players. We then propose a learning algorithm for repeated game self-play. Our algorithm allows players to converge, in an initially unknown repeated game, to a joint behavior optimal in a certain, well-defined sense, without communication between players. Finally, we propose a family of algorithms for approximately solving dynamic games, and for extracting equilibrium strategy profiles. In this context, we first propose a method to compute a nonempty subset of approximate subgame-perfect equilibria in repeated games. We then demonstrate how to extend this method for approximating all subgame-perfect equilibria in repeated games, and also for solving more complex dynamic games.
Weiss, John C. (John Chandler). "Adaptive dialogues--a university's response to complex environmental problems." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/36490.
Full textDukellis, John N. (John Nicholas) 1977. "Applications of auction algorithms to complex problems with constraints." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/28455.
Full textIncludes bibliographical references (leaves 87-88).
Linear and nonlinear assignment problems are addressed by the use of auction algorithms. The application of auction to the standard linear assignment problem is reviewed. The extension to nonlinear problems is introduced and illustrated with two examples. Techniques that are employed for model reduction include discretization, classification, and imposition of assignment constraints. The tradeoff between solution speed and optimality for the nonlinear problem is analyzed and demonstrated for the sample problem.
by John N. Dukellis.
M.Eng.
Ghaderi, Reza. "Arranging simple neural networks to solve complex classification problems." Thesis, University of Surrey, 2000. http://epubs.surrey.ac.uk/844428/.
Full textDu, Dawei. "Biogeography-based optimization for combinatorial problems and complex systems." Cleveland State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=csu1400504249.
Full textKiss, Kristina, and P. G. Pererva. "Strategic problems of economic security of Ukraine." Thesis, Національний технічний університет "Харківський політехнічний інститут", 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/40227.
Full textKandjani, Hadi Esmaeilzadeh. "Engineering Self-designing Enterprises as Complex Systems Using Enterprise Architecture Cybernetics." Thesis, Griffith University, 2013. http://hdl.handle.net/10072/367332.
Full textThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Information and Communication Technology
Science, Environment, Engineering and Technology
Full Text
Sterner, Paula Franzen. "The influence of process utilization and analogous problem solving experiences in solving complex, multiple-step problems /." free to MU campus, to others for purchase, 1997. http://wwwlib.umi.com/cr/mo/fullcit?p9841337.
Full textHector, Donald Charles Alexander. "Towards a new philosophy of engineering: structuring the complex problems from the sustainability discourse." Thesis, The University of Sydney, 2008. http://hdl.handle.net/2123/2690.
Full textHector, Donald Charles Alexander. "Towards a new philosophy of engineering: structuring the complex problems from the sustainability discourse." University of Sydney, 2008. http://hdl.handle.net/2123/2690.
Full textRevised work with minor emendations approved by supervisor.
This dissertation considers three broad issues which emerge from the sustainability discourse. First is the nature of the discourse itself, particularly the underlying philosophical positions which are represented. Second, is the nature of the highly complex types of problem which the discourse exposes. And third is whether the engineering profession, as it is practised currently, is adequate to deal with such problems. The sustainability discourse exposes two distinct, fundamentally irreconcilable philosophical positions. The first, “sustainable development”, considers humanity to be privileged in relation to all other species and ecosystems. It is only incumbent upon us to look after the environment to the extent to which it is in our interests to do so. The second, “sustainability”, sees humanity as having no special moral privilege and recognises the moral status of other species, ecosystems, and even wilderness areas. Thus, sustainability imposes upon us a moral obligation to take their status into account and not to degrade or to destroy them. These two conflicting positions give rise to extremely complex problems. An innovative taxonomy of problem complexity has been developed which identifies three broad categories of problem. Of particular interest in this dissertation is the most complex of these, referred to here as the Type 3 problem. The Type 3 problem recognises the systemic complexity of the problem situation but also includes differences of the domain of interests as a fundamental, constituent part of the problem itself. Hence, established systems analysis techniques and reductionist approaches do not work. The domain of interests will typically have disparate ideas and positions, which may be entirely irreconcilable. The dissertation explores the development of philosophy of science, particularly in the last 70 years. It is noted that, unlike the philosophy of science, the philosophy of engineering has not been influenced by developments of critical theory, cultural theory, and postmodernism, which have had significant impact in late 20th-century Western society. This is seen as a constraint on the practice of engineering. Thus, a set of philosophical principles for sustainable engineering practice is developed. Such a change in the philosophy underlying the practice of engineering is seen as necessary if engineers are to engage with and contribute to the resolution of Type 3 problems. Two particular challenges must be overcome, if Type 3 problems are to be satisfactorily resolved. First, issues of belief, values, and morals are central to this problem type and must be included in problem consideration. And second, the problem situation is usually so complex that it challenges the capacity of human cognition to deal with it. Consequently, extensive consideration is given to cognitive and behavioural psychology, in particular to choice, judgement and decision-making in uncertainty. A novel problem-structuring approach is developed on three levels. A set philosophical foundation is established; a theoretical framework, based on general systems theory and established behavioural and cognitive psychological theory, is devised; and a set of tools is proposed to model Type 3 complex problems as a dynamic systems. The approach is different to other systems approaches, in that it enables qualitative exploration of the system to plausible, hypothetical disturbances. The problem-structuring approach is applied in a case study, which relates to the development of a water subsystem for a major metropolis (Sydney, Australia). The technique is also used to critique existing infrastructure planning processes and to propose an alternative approach.
Gaertner, Evgeniya. "Basic complex boundary value problems in the upper half-plane." [S.l.] : [s.n.], 2006. http://www.diss.fu-berlin.de/2006/320/index.html.
Full textGong, Jing. "Hybrid Methods for Unsteady Fluid Flow Problems in Complex Geometries." Doctoral thesis, Uppsala universitet, Avdelningen för teknisk databehandling, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-8341.
Full textShi, Ning. "Dynamic resource allocation problems with uncertainties and complex work rules." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?IELM%202007%20SHI.
Full textMalm, Catharina, and Mika Silfver. "Investigating the complex problems of waste paper at Larsson Offsettryck." Thesis, Linköpings universitet, Institutionen för teknik och naturvetenskap, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-95276.
Full textPappersmakulatur ar ett stort problem inom den grafiska branschen, bade ur miljoperspektiv och ur en ekonomisk synvinkel. Eftersom fokus ofta laggs pa att halla laga priser och hog produktionshastighet blir arbetet med att minska mangden pappersmakulatur en sekundar fraga for manga foretag. I detta examensarbete har vi sokt orsaker till makulaturuppkomst i borjan av tryckprocessen, installningsfasen, genom att studera tryckpressen Heidelberg Speedmaster CD 102-5 pa tryckeriet Larsson Offsettryck AB i Linkoping. Vi har tagit fram forslag pa hur mangden makulatur kan minskas genom att observera och intervjua personalen pa Larsson Offsettryck AB, mata tryckkvalitet och utfora analyser baserade pa den teoretiska kunskap vi inforskaffat under var utbildning vid Linkopings universitet. For vara testtryckningar har vi anvant oss av en bestruken typ av papper, Tom&Otto Silk 150 g, och en obestruken typ av papper, Maxi Offset 170 g. For att analysera vara resultat har vi anvant oss av bade objektiva och subjektiva utvarderingsmetoder. Vara resultat visar att de justeringar som gors i borjan av tryckprocessen, for att astadkomma ratt fargbalans i tryckpressen, kan avslutas tidigare an vad tryckpressen indikerar. Under varje justering kan 40-60 ark sparas. Enligt var undersokning kravs det idag omkring 140 ark per justering pa Larsson Offsettryck AB, vilket innebar att antalet installningsark kan minskas med cirka 35 % genom denna enkla forandring av tryckprocessen. Vi har aven undersokt Larsson Offsettryck AB:s ICC-profiler och slutit oss till att den grabalans som aterfinns i profilen for obestruket papper inte ar optimal och kraver forbattring.
Maden, William. "Models and heuristic algorithms for complex routing and scheduling problems." Thesis, Lancaster University, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.441791.
Full textJia, Haibo. "Semantic enhanced argumentation based group decision making for complex problems." Thesis, Glasgow Caledonian University, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.555820.
Full textCox, Jürgen 1970. "Solution of sign and complex action problems with cluster algorithms." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8646.
Full textIncludes bibliographical references (p. [105]-109) and index.
Two kinds of models are considered which have a Boltzmann weight which is either not real or real but not positive and so standard Monte Carlo methods are not applicable. These sign or complex action problems are solved with the help of cluster algorithms. In each case improved estimators for the Boltzmann weight are constructed which are real and positive. The models considered belong to two classes: fermionic and non-fermionic models. An example for a non-fermionic model is the Potts model approximation to QCD at non-zero baryon density. The three-dimensional three-state Potts model captures the qualitative features of this theory. It has a complex action and so the Boltzmann weight cannot be interpreted as a probability. The complex action problem is solved by using a cluster algorithm. The improved estimator for the complex phase of the Boltzmann factor is real and positive and is used for importance sampling. The first order deconfinement transition line is investigated and the universal behavior at its critical endpoint is studied.
(cont.) An example for a fermionic model with a sign problem are staggered fermions with 2 flavors in 3+1 dimensions. Here the sign is connected to the permutation sign of fermion world lines and is of nonlocal nature. Cluster flips change the topology of the fermion world lines and they have a well defined effect on the permutation sign independent of the other clusters. The sign problem is solved by suppressing those clusters whose contribution to the partition function and observables of interest would be zero. We confirm that the universal critical behavior of the finite temperature chiral phase transition is the one of the three dimensional Ising model. We also study staggered fermions with one flavor in 2+1 dimensions and confirm that the chiral phase transition then belongs to the universality class of the two dimensional Ising model.
by Jürgen Cox.
Ph.D.
AlAbed-AlHaq, Abrar Fawwaz. "APPLYING GRAPH MINING TECHNIQUES TO SOLVE COMPLEX SOFTWARE ENGINEERING PROBLEMS." Kent State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=kent1442986844.
Full textDaroui, Danesh. "Efficient PEEC-based solver for complex electromagnetic problems in power electronics." Doctoral thesis, Luleå tekniska universitet, EISLAB, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26524.
Full textGodkänd; 2012; 20121114 (dan); DISPUTATION Ämne: Industriell elektronik/Industrial Electronics Opponent: PhD Bruce Archambeault, IBM, Research Triangle Park, North Carolina, USA. Opponenten utför sitt uppdrag via distansöverbryggande teknik Ordförande: Docent Jonas Ekman, Institutionen för system- och rymdteknik, Luleå tekniska universitet Tid: Torsdag den 17 januari 2013, kl 13.30 Plats: A109, Luleå tekniska universitet
Laber, Micaela. "The Politics of Biosimilars: Understanding Stakeholder Influence Over Complex Policy Problems." Scholarship @ Claremont, 2018. http://scholarship.claremont.edu/cmc_theses/1815.
Full textZhang, Zili, and mikewood@deakin edu au. "An Agent-based hybrid framework for decision making on complex problems." Deakin University. School of Computing and Mathematics, 2001. http://tux.lib.deakin.edu.au./adt-VDU/public/adt-VDU20050815.110726.
Full textFeng, Luming. "PRACTICAL APPROACHES TO COMPLEX ROLE ASSIGNMENT PROBLEMS IN ROLE-BASED COLLABORATION." Thesis, Laurentian University of Sudbury, 2013. https://zone.biblio.laurentian.ca/dspace/handle/10219/2105.
Full textRoper, Mark. "Honeybee visual cognition : a miniature brain's simple solutions to complex problems." Thesis, Queen Mary, University of London, 2017. http://qmro.qmul.ac.uk/xmlui/handle/123456789/25938.
Full textHu, Kun. "Three Essays on Modeling Complex Dynamic Problems in Health and Safety." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/27621.
Full textPh. D.
Lawson, Suzanne. "Addressing Complex Problems: Spatial Targeting, Disadvantage and Urban Governance in Australia." Thesis, Griffith University, 2011. http://hdl.handle.net/10072/366655.
Full textThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Environment
Science, Environment, Engineering and Technology
Full Text
Gül, Asmen. "Crowdsourcing of Complex Problems in Industrial Firms : A Case Study Within the Packaging Industry." Thesis, KTH, Industriell ekonomi och organisation (Inst.), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-284204.
Full textDenna studie grundar sig i uppkomsten av nya crowdsourcing-tekniker som har gjort det möjligt att lösa affärsproblem av komplexa natur genom att nå utanför organisationens traditionella gränser. Även om crowdsourcing inte är ett nytt koncept har nya teknologiska trender som Industri 4.0 och ett ökat intresse från organisationer att dra nytta av kunskap från internetbaserade grupper och plattformar gjort det till ett intressant fall att studera. Fallstudien genomfördes i USA på ett väletablerat svenskt företag inom förpackningsindustring. Till skillnad från traditionella former av crowdsourcing av repetitiva och enkla uppgifter, fokuserar denna studie på komplexa problem med öppna mål, vilket ofta kräver iteration och expert-kompetens. Fallstudien om projektet Megatron avser en förpackningsprodukt utvecklad för att transportera dataservrar till globala teknikföretag i Silicon Valley. Projektet skiljer sig avsevärt i form av produktens material och design jämfört tidigare förpackningsversioner som tjänat samma syfte. Dels kan den vikas som tom för att spara utrymme, erhålla logistikfördelar som mindre koldioxidutsläpp och kostnad, och dels har den konkurrenskraftiga egenskaper som starkt och lätt material. Med utgångspunkt från projektet och produktens nya egenskaper klassas det i rapporten som ett komplext problem för industriföretaget. Innovation, kostnad och projektetstidsaspekt användes som mätvärden för att utvärdera möjligheterna kring crowdsourcing. Den empiriska datan inkluderade intervjuer och dokumentationen kring projektets olika faser. Empirin analyserades därefter med hjälp av litteratur, teorier och modeller som syftade till sambandet mellan problemtyper och innovation, samt hur dessa förhåller sig till crowdsourcing och företagets affärsvärde. Studien visar en stark vilja bland företagets anställda att integrera digitala plattformar och verktyg för experimentering och prototyputveckling. Vidare identifierade studien paradoxer såsom mycket förändringsbara egenskapen av komplexa problem I förhållande till innovation. Däremot presenterar arbetet rekommendationer för att hantera osäkerheten, exempelvis genom ryktesbaserade plattformar och och granskningsverktyg för att validera arbetens kvalitet.
Cameron, Mark A., and Mark Cameron@csiro au. "A Problem Model for Decision Support Systems." The Australian National University. Faculty of Engineering and Information Technology, 2000. http://thesis.anu.edu.au./public/adt-ANU20020717.144031.
Full textThies, Anna. "Understanding Complex Problems in Healthcare : By Applying a Free-Flowing Design Practice." Licentiate thesis, Stockholms universitet, Institutionen för data- och systemvetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-129710.
Full textHälso- och sjukvården är i behov av förändring. Ökningen av kroniska tillstånd utgör en stor utmaning för sjukvårdsorganisationens struktur som fortfarande till stor del baseras på akut, snarare än kronisk vård. Sjukvårdsutveckling sker ofta i fragmenterade processer, och utifrån professioners, snarare än patienters perspektiv. En ny typ av designmetodologi har på senare år börjat tillämpas för att utveckla och skapa innovationer inom hälso- och sjukvården. Den har allt mer börjat användas för att utveckla sjukvårdsorganisationen i sig, snarare än att bara utveckla dess produkter, IT-system eller tjänster. Avhandlingen fokuserar på problem som kan beskrivas som öppna, komplexa, föränderliga, sammanlänkade eller 'wicked' [onda]. Följande forskningsfrågor undersöks: I. Hur kan designers kompetens bidra till innovation inom hälso-och sjukvården? II. Hur kan designers bidra till att identifiera komplexa problem inom hälso- och sjukvården? Empirisk data har samlats in i samband med två innovationsprojekt inom sjukvården där författaren haft en aktiv roll som såväl designer som forskare. Forskningen baseras på kvalitativ data som har samlats in genom etnografisk metodologi (dvs. intervjuer, deltagande observationer och fältanteckningar). Datan har analyserats enligt 'open coding'-principer och aktivitetsteori. Resultaten lyfter fram värdet av en 'free-flowing design practice' [fritt föränderlig designpraktik] för att förstå komplexa problem. Den fritt föränderliga designpraktiken medför att problem-rymden och lösnings-rymden sam-utvecklas. Dessa rymder expanderar iterativt, medan de kontinuerligt påverkar varandra mot en omdefiniering av problem, i syfte att hitta lösningar som kan leda till radikal innovation, snarare än bara inkrementella förbättringar.
Middleton, Howard Eric, and n/a. "The Role of Visual Mental Imagery in Solving Complex Problems in Design." Griffith University. School of Education, 1998. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20050919.170056.
Full textTap, Koray. "Complex source point beam expansions for some electromagnetic radiation and scattering problems." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1190015563.
Full textDu, Zhihua [Verfasser]. "Boundary Value Problems for Higher Order Complex Partial Differential Equations / Zhihua Du." Berlin : Freie Universität Berlin, 2008. http://d-nb.info/1022870912/34.
Full textSpellman, Kevin James. "Using ideation tools for face-to-face collaboration within complex design problems." Thesis, Goldsmiths College (University of London), 2010. http://research.gold.ac.uk/4744/.
Full textMiddleton, Howard Eric. "The Role of Visual Mental Imagery in Solving Complex Problems in Design." Thesis, Griffith University, 1998. http://hdl.handle.net/10072/366392.
Full textThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Education
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Taylor, Ryan M. "Bioinformatic Solutions to Complex Problems in Mass Spectrometry Based Analysis of Biomolecules." BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/5585.
Full textCharles, Mehdi. "Modeling and solving complex multi-item lot-sizing problems with inventory constraints." Thesis, Lyon, 2021. http://www.theses.fr/2021LYSEM039.
Full textIn this thesis, we considered the capacitated multi-item lot-sizing problem with setup times and lost sales. We extended this problem to take into account important industrial aspects, especially with regards to inventory management. We first studied the end-of-horizon effects on optimal solutions of lot-sizing problems that, even on a rolling horizon, can lead to important additional costs. To reduce these effects, we have added a global minimum ending inventory constraint as well as a maximum ending inventory constraint for each item. These values were deduced from the analysis of a cyclical capacitated lot-sizing problem with setup times, whose linear relaxation can be analytically solved. Then, we modeled the inventory evolution within each period. This point is especially relevant when the storage capacity is limited. We added new inventory constraints to better respect inventory bounds when scheduling productions within each period. The constraints differ based on hypotheses on the shapes of evolution of production and demand. Numerical experiments showed that these new constraints enable to schedule production plans with a better inventory management. Decomposition approaches (Lagrangian relaxation, relax-and-fix) were developed in order to propose generic approaches to solve capacitated lot-sizing problems with setup times. An original use of parallelization was proposed in order to reduce the size of the subproblems to solve and to use Decisionbrain's tools.Finally, the parallelized relax-and-fix was implemented into DecisionBrain's optimization tool and tests were performed on industrial instances