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Dissertations / Theses on the topic 'Systems'
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1
Heng, Jiin Shyang. "On systems engineering processes in system-of-systems acquisition." Thesis, Monterey, California. Naval Postgraduate School, 2011. http://hdl.handle.net/10945/5689.
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Approved for public release; distribution is unlimited.S results show that a low-risk SoS acquisition could continue with the current SE process as the benefits derived from an extensive front-end SE process are limited. Conversely, a high-risk SoS acquisition should adopt the SoS SE process proposed herein to enhance the SoS acquisition program's chance of success. It is highrisk SoS acquisitions such as the US Army's Future Combat System, the US Coast Guard's Deep Water System, the Joint Tactical Radio System (JTRS), and Homeland Security's SBInet that would likely benefit from the proposed SoS SE process.
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Werner, Matthias. "Verteilte Mobilität - Eine spannende Herausforderung." Universitätsbibliothek Chemnitz, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-78213.
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Cyber-physikalische Systeme (CPS) sind eine erweitere Sicht auf eingebettete Systeme, die die konkreten umgebenden Elemente in das Systemdesign einbeziehen. Das Design solcher Systeme erfordert neue Herangehensweisen: Während beispielsweise in "normalen" verteilten Systemen Aspekte wie "Bewegung" oder "Ort" möglichst transparent und damit für den Nutzer unsichtbar gestaltet werden, benötigen CPS-Anwendungen häufig Bewusstsein für Bewegung oder Ort, d.h., sie sind _motion aware_ oder _location aware_.
Die Professur "Betriebssysteme" der TUC hat sich die Frage gestellt, wie eine generische Unterstützung für solche verteilte mobile Systeme aussehen könnte. Im Vortrag werden Probleme, Konzepte und erste Lösungsansätze für ein künftiges Betriebssystem für diese Art von Systemen vorgestellt.
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Magee, Christopher, and Weck Olivier de. "Complex System Classification." International Council On Systems Engineering (INCOSE), 2004. http://hdl.handle.net/1721.1/6753.
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The use of terms such as “Engineering Systems”, “System of systems” and others have been coming into greater use over the past decade to denote systems of importance but with implied higher complexity than for the term systems alone. This paper searches for a useful taxonomy or classification scheme for complex Systems. There are two aspects to this problem: 1) distinguishing between Engineering Systems (the term we use) and other Systems, and 2) differentiating among Engineering Systems. Engineering Systems are found to be differentiated from other complex systems by being human-designed and having both significant human complexity as well as significant technical complexity. As far as differentiating among various engineering systems, it is suggested that functional type is the most useful attribute for classification differentiation. Information, energy, value and mass acted upon by various processes are the foundation concepts underlying the technical types.Engineering Systems Division and Mechanical Engineering, Center for Innovation in Product Development
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Venkatesh, Saligrama Ramaswamy. "System-identification for complex-systems." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10440.
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CRESTO, ALEINA SARA. "Design methodologies for space systems in a System of Systems (SoS) architecture." Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2790162.
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Schneider, Judith. "Dynamical structures and manifold detection in 2D and 3D chaotic flows." Phd thesis, [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=973637420.
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Hof, Jacoba Marchiena van den. "System theory and system identification of compartmental systems." [S.l. : [Groningen] : s.n.] ; [University Library Groningen] [Host], 1996. http://irs.ub.rug.nl/ppn/152829512.
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Bjelkemyr, Marcus. "System of Systems Characteristics in Production System Engineering." Doctoral thesis, Stockholm : Skolan för industriell teknik och management, Kungliga Tekniska högskolan, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10617.
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Van, Dyk Liezl. "Manufacturing execution systems." Diss., University of Pretoria, 1999. http://hdl.handle.net/2263/29348.
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The term Manufacturing Execution Systems (MES) was created in 1990 by Advanced Manufacturing Research (AMR) to describe the suite of software products which enables the execution of manufacturing through the integration of planning and control systems. The purpose of this dissertation is to determine the current status of MES and to investigate the possible role of the Industrial Engineer in the development, implementation and use of MES. To achieve this objective, the most commonly accepted, recent and relevant definitions, business models, functions and developments of MES are investigated. Based on these, a new MES Function Matrix is developed and validated by a case study. Finally, Industrial Engineering is related to MES and the role of the Industrial Engineer promoted. The emergence of MES is a result of the evolution of three interrelated elements, namely manufacturing strategies, manufacturing planning and control systems and information technology. The development of global markets and the requirement for agile manufacturing led to the need for MES. The evolution of various aspects of Enterprise Resource Planning (ERP), and more specifically Manufacturing Planning and Control (MPC) systems, is discussed as part of the investigation of the development of MES. The Three-Layer-model and REPAC-¬model by AMR Research, as well as variations of these models compiled by MESA ("International MES Association"), are investigated. Manufacturing execution is absent in traditional MPC models. Modern models, such as the Three-Layer-model, suggest an execution layer to be inserted between the planning and control layers. The investigation of the function models of McClellan and MESA International indicates that discrepancies exist between these models with regard to the functions of MES. A new MES Function Matrix is developed to address such shortcomings and is applied to a case study of DIAMES, a software product used by Aberdare Cables and promoted as an MES product. As an MES developer, the Industrial Engineer can act as designer, planner and innovator. The greatest value can, however, be added by the Industrial Engineer as integrator to ensure that horizontal plant-wide execution takes place, and not only vertical "islands of automation" integrated with planning systems. In order to accomplish this, the Industrial Engineer needs to fulfill the roles of boundary-spanner, facilitator, coordinator, analyst, chairperson, decision-maker, as well as trainer or educator. MES can also be used by the Industrial Engineer as a tool, for example as part of a program of continuous improvement. The identification of the relationship between the expertise of the Industrial Engineer and the roles to be played within the MES arena gave birth to the establishment of an MES research initiative at the Department of Industrial and Systems Engineering of the University of Pretoria.Dissertation (MEng (Industrial Engineering))--University of Pretoria, 2007.
Industrial and Systems Engineering
unrestricted
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Makhdum, Farah, and Kamran Mian. "Smarter City : A System to Systems." Thesis, Blekinge Tekniska Högskola, Sektionen för datavetenskap och kommunikation, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-4200.
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Developments in the technological fields have opened doors to sustain quality of life for making cities smarter and democratic by allowing citizens to play active roles rather being just passive participants along with their governments. Therefore, in this study we have proposed an idealized interaction system- a process used for organizational development based on Interactive Planning Approach, where citizen and government adopt more effective and efficient ways to coordinate, collaborate and communicate for the development and growth of different systems in the city, which ultimately serves as “system to systems”. By using Delphi methodology- a reaserch approach by Norman Dalkey (1946), we invited 25 people representing a wide variety of interests participated in the series two rounds of surveys to suggest more effective and efficient methods of interaction for the citizens and government. All proposed ways after second round of survey are used to design the Idealized Smarter City model – a model of knowledge-based sustainable development. However, structural and behavioral comparisons suggest the need of further improvement to get the proposed system implemented, in review of rapidly increasing population and resulting deteriorating resource availability to sustain the social and technological needs.Farah Makhdum +92.321.4702133 Kamran Mian +92.321.3213219
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Majumdar, WindyJoy Springs. "System of systems technology readiness assessment." Thesis, Monterey, Calif. : Naval Postgraduate School, 2007. http://bosun.nps.edu/uhtbin/hyperion-image.exe/07Sep%5FMajumdar.pdf.
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Thesis (M.S. in System Engineering Management)--Naval Postgraduate School, September 2007.Thesis Advisor(s): Osmundson, John ; Mandelbaum, Jay. "September 2007." Description based on title screen as viewed on October 23, 2007. Includes bibliographical references (p. 137-140). Also available in print.
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Fasoulas, Aristides Ioannis. "Inmarsat communications system : a systems approach." Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/28293.
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Koo, Kevin C. K. (Kevin Cheng Keong). "Investigating Army systems and Systems of Systems for value robustness." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/59253.
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Thesis (S.M. in System Design and Management)--Massachusetts Institute of Technology, Engineering Systems Division, System Design and Management Program, 2010.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 243-250).
This thesis proposes a value robustness approach to architect defense systems and Systems of Systems (SoS). A value robust system or SoS has the ability to provide continued value to stakeholders by performing well to meet the mission intent under a variety of future contexts. The proposed approach encompasses three methods, namely "Needs to Architecture" framework, Multi-Attribute Tradespace Exploration (MATE) and Epoch-Era Analysis. The architecting approach will commence with the "Needs to Architecture" framework. Stakeholders' needs are elicited and design concepts will be formulated. MATE is then used to screen, evaluate and select suitable design concepts. Subsequently, Epoch-Era Analysis is used to guide system architects to anticipate changes across foreseeable epochs, which are time periods of fixed needs and context. The tradespace analysis is repeated across all these epochs. Pareto Trace and Filtered Outdegree metrics will be used to identify passive and active value robust designs. The proposed value robustness approach is demonstrated conceptually using an Intelligence, Surveillance and Reconnaissance (ISR) system and an Army SoS case study. The proposed value robustness approach offers a potential methodology to design and evaluate complex defense systems such that they continue to be valuable to stakeholders over time. The method is also complementary to existing architecting methods such as modeling and simulation. The end product of applying this approach is a cost efficient defense system, which might be passively or actively value robust. High switching and modification costs might be avoided even if changes to the active value robust defense system are required. Through the use of the Army SoS case study discussion, the author suggests that a value robust defense SoS architecture is one that encompasses the desired ilities of changeability and interoperability.
by Kevin C.K. Koo.
S.M.in System Design and Management
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Iacobucci, Joseph Vincent. "Rapid Architecture Alternative Modeling (RAAM): a framework for capability-based analysis of system of systems architectures." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/43697.
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The current national security environment and fiscal tightening make
it necessary for the Department of Defense to transition away from a
threat based acquisition mindset towards a capability based approach
to acquire portfolios of systems. This requires that groups of
interdependent systems must regularly interact and work together as
systems of systems to deliver desired capabilities. Technological
advances, especially in the areas of electronics, computing, and
communications also means that these systems of systems are tightly
integrated and more complex to acquire, operate, and manage. In
response to this, the Department of Defense has turned to system
architecting principles along with capability based analysis. However,
because of the diversity of the systems, technologies, and
organizations involved in creating a system of systems, the design
space of architecture alternatives is discrete and highly
non-linear. The design space is also very large due to the hundreds of
systems that can be used, the numerous variations in the way systems
can be employed and operated, and also the thousands of tasks that are
often required to fulfill a capability. This makes it very difficult
to fully explore the design space. As a result, capability based
analysis of system of systems architectures often only considers a
small number of alternatives. This places a severe limitation on the
development of capabilities that are necessary to address the needs of
the war fighter.
The research objective for this manuscript is to develop a Rapid
Architecture Alternative Modeling (RAAM) methodology to enable
traceable Pre-Milestone A decision making during the conceptual phase
of design of a system of systems. Rather than following current trends
that place an emphasis on adding more analysis which tends to increase
the complexity of the decision making problem, RAAM improves on
current methods by reducing both runtime and model creation
complexity. RAAM draws upon principles from computer science, system
architecting, and domain specific languages to enable the automatic
generation and evaluation of architecture alternatives. For example,
both mission dependent and mission independent metrics are
considered. Mission dependent metrics are determined by the
performance of systems accomplishing a task, such as Probability of
Success. In contrast, mission independent metrics, such as
acquisition cost, are solely determined and influenced by the other
systems in the portfolio. RAAM also leverages advances in parallel
computing to significantly reduce runtime by defining executable
models that are readily amendable to parallelization. This allows the
use of cloud computing infrastructures such as Amazon's Elastic
Compute Cloud and the PASTEC cluster operated by the Georgia Institute
of Technology Research Institute (GTRI). Also, the amount of data that
can be generated when fully exploring the design space can quickly
exceed the typical capacity of computational resources at the
analyst's disposal. To counter this, specific algorithms and
techniques are employed. Streaming algorithms and recursive
architecture alternative evaluation algorithms are used that reduce
computer memory requirements. Lastly, a domain specific language is
created to provide a reduction in the computational time of executing
the system of systems models. A domain specific language is a small,
usually declarative language that offers expressive power focused on a
particular problem domain by establishing an effective means to
communicate the semantics from the RAAM framework. These techniques
make it possible to include diverse multi-metric models within the
RAAM framework in addition to system and operational level trades.
A canonical example was used to explore the uses of the
methodology. The canonical example contains all of the features of a
full system of systems architecture analysis study but uses fewer
tasks and systems. Using RAAM with the canonical example it was
possible to consider both system and operational level trades in the
same analysis. Once the methodology had been tested with the canonical
example, a Suppression of Enemy Air Defenses (SEAD) capability model
was developed. Due to the sensitive nature of analyses on that
subject, notional data was developed. The notional data has similar
trends and properties to realistic Suppression of Enemy Air Defenses
data. RAAM was shown to be traceable and provided a mechanism for a
unified treatment of a variety of metrics. The SEAD capability model
demonstrated lower computer runtimes and reduced model creation
complexity as compared to methods currently in use. To determine the
usefulness of the implementation of the methodology on current
computing hardware, RAAM was tested with system of system architecture
studies of different sizes. This was necessary since system of systems
may be called upon to accomplish thousands of tasks. It has been
clearly demonstrated that RAAM is able to enumerate and evaluate the
types of large, complex design spaces usually encountered in
capability based design, oftentimes providing the ability to
efficiently search the entire decision space. The core algorithms for
generation and evaluation of alternatives scale linearly with expected
problem sizes. The SEAD capability model outputs prompted the
discovery a new issue, the data storage and manipulation requirements
for an analysis. Two strategies were developed to counter large data
sizes, the use of portfolio views and top `n' analysis. This proved
the usefulness of the RAAM framework and methodology during
Pre-Milestone A capability based analysis.
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Thoms, Joanne. "Human centric systems engineering." Thesis, University of Bath, 2009. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501636.
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This thesis is a study into an engineering technology that enables us to investigate the cognitive aspects of systems. Where previous techniques have focused on individual human roles undertaking defined tasks, this work develops engineering technologies to understand the cognitive contribution of the human team participating in the system and how the deployment of machine decision making technologies can influence and change the possible human contribution in that system. This work first develops a framework for understanding an individual’s cognitive focus and then an engineering process that enables us to model the individual human cognitive contribution to the system and by combining these models to create a rich system model. This model can then be used to consider the deployment of advanced machine technologies, to identify new human or machine interaction requirements that are focused on maintaining the effectiveness of the human contribution. It then operationalises and verifies these engineering techniques by applying them to two systems. The first study chosen took an existing system whose effectiveness had been changed by the deployment of machine automation which has known problems; the use of the framework enabled the prediction of these problems and the identification of potential solutions. The second study investigated an existing human system and the potential deployment of machine technology. This study used the framework to create models of the human cognitive focus and joined them together to form a rich system model, into which the deployment of the machine technology was considered. This resulted in the ability to identify the impact of the machine technology across the entire human team, enabling the identification of additional requirements to support the human cognition and to maintain human knowledge.
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Zaks, Michael. "Fractal Fourier spectra in dynamical systems." Thesis, [S.l.] : [s.n.], 2001. http://pub.ub.uni-potsdam.de/2002/0019/zaks.ps.
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Li, Siying. "Context-aware recommender system for system of information systems." Thesis, Compiègne, 2021. http://www.theses.fr/2021COMP2602.
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Travailler en collaboration n’est plus une question mais une réalité, la question qui se pose aujourd’hui concerne la mise en œuvre de la collaboration de façon à ce qu’elle soit la plus réussie possible. Cependant, une collaboration réussie n’est pas facile et est conditionnée par différents facteurs qui peuvent l’influencer. Il est donc nécessaire de considérer ces facteurs au sein du contexte de collaboration pour favoriser l’efficacité de collaboration. Parmi ces facteurs, le collaborateur est un facteur principal, qui est étroitement associé à l’efficacité et à la réussite des collaborations. Le choix des collaborateurs et/ou la recommandation de ces derniers en tenant compte du contexte de la collaboration peut grandement influencer la réussite de cette dernière. En même temps, grâce au développement des technologies de l’information, de nombreux outils numériques de collaboration sont mis à la disposition tels que les outils de mail et de chat en temps réel. Ces outils numériques peuvent eux-mêmes être intégrés dans un environnement de travail collaboratif basé sur le web. De tels environnements permettent aux utilisateurs de collaborer au-delà de la limite des distances géographiques. Ces derniers laissent ainsi des traces d’activités qu’il devient possible d’exploiter. Cette exploitation sera d’autant plus précise que le contexte sera décrit et donc les traces enregistrées riches en description. Il devient donc intéressant de développer les environnements de travail collaboratif basé sur le web en tenant d’une modélisation du contexte de la collaboration. L’exploitation des traces enregistrés pourra alors prendre la forme de recommandation contextuelle de collaborateurs pouvant renforcer la collaboration. Afin de générer des recommandations de collaborateurs dans des environnements de travail collaboratifs basés sur le web, cette thèse se concentre sur la génération des recommandations contextuelles de collaborateurs en définissant, modélisant et traitant le contexte de collaboration. Pour cela, nous proposons d’abord une définition du contexte de collaboration et choisissons de créer une ontologie du contexte de collaboration compte tenu des avantages de l’approche de modélisation en l’ontologie. Ensuite, une similarité sémantique basée sur l’ontologie est développée et appliquée dans trois algorithmes différents (i.e., PreF1, PoF1 et PoF2) afin de générer des recommandations contextuelles des collaborateurs. Par ailleurs, nous déployons l’ontologie de contexte de collaboration dans des environnements de travail collaboratif basés sur le web en considérant une architecture de système des systèmes d’informations du point de vue des environnements de travail collaboratif basés sur le web. À partir de cette architecture, un prototype correspondant d’environnement de travail collaboratif basé sur le web est alors construit. Enfin, un ensemble de données de collaborations scientifiques est utilisé pour tester et évaluer les performances des trois algorithmes de recommandation contextuelle des collaborateursWorking collaboratively is no longer an issue but a reality, what matters today is how to implement collaboration so that it is as successful as possible. However, successful collaboration is not easy and is conditioned by different factors that can influence it. It is therefore necessary to take these impacting factors into account within the context of collaboration for promoting the effectiveness of collaboration. Among the impacting factors, collaborator is a main one, which is closely associated with the effectiveness and success of collaborations. The selection and/or recommendation of collaborators, taking into account the context of collaboration, can greatly influence the success of collaboration. Meanwhile, thanks to the development of information technology, many collaborative tools are available, such as e-mail and real-time chat tools. These tools can be integrated into a web-based collaborative work environment. Such environments allow users to collaborate beyond the limit of geographical distances. During collaboration, users can utilize multiple integrated tools, perform various activities, and thus leave traces of activities that can be exploited. This exploitation will be more precise when the context of collaboration is described. It is therefore worth developing web-based collaborative work environments with a model of the collaboration context. Processing the recorded traces can then lead to context-aware collaborator recommendations that can reinforce the collaboration. To generate collaborator recommendations in web-based Collaborative Working Environments, this thesis focuses on producing context-aware collaborator recommendations by defining, modeling, and processing the collaboration context. To achieve this, we first propose a definition of the collaboration context and choose to build a collaboration context ontology given the advantages of the ontology-based modeling approach. Next, an ontologybased semantic similarity is developed and applied in three different algorithms (i.e., PreF1, PoF1, and PoF2) to generate context-aware collaborator recommendations. Furthermore, we deploy the collaboration context ontology into web-based Collaborative Working Environments by considering an architecture of System of Information Systems from the viewpoint of web-based Collaborative Working Environments. Based on this architecture, a corresponding prototype of web-based Collaborative Working Environment is then constructed. Finally, a dataset of scientific collaborations is employed to test and evaluate the performances of the three context-aware collaborator recommendation algorithms
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O'Such, William R. "Information theoretic analysis of multi-stage communication/imaging systems /." Online version of thesis, 1988. http://hdl.handle.net/1850/10568.
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Uebe, Jochen. "Elektrochemie supramolekularer Systeme - Electrochemistry of supramolecular systems." Gerhard-Mercator-Universitaet Duisburg, 2001. http://www.ub.uni-duisburg.de/ETD-db/theses/available/duett-05232001-110245/.
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Host and guest compounds self-assemble to supramolecular complexes. Noncovalent bonding donor-acceptor-interactions of supramolecular complexes like that of J. F. Stoddart et al. can be weakened by redox reactions, but the complexes desintegrate. Here, it is described the reversed way. The initial reaction mixture contains a host and a potential guest compound not interacting with each other. The potential guest compound will be transferred in a real guest compound by electrochemical reduction and the supramolecular complexation is induced. Tetracationic, electronwithdrawing cyclophanes with two redoxactive units of 4,4-bipyridindiium respectively 2,7-diazapyrendiium act as host compounds, electronwithdrawing quinones as potential guest compounds. The host and guest compounds and their interaction in complex are characterized and studied by cyclic voltammetry and spectroelectrochemistry. It can be demonstrated that the reduction potentials are shifted, that the cyclophane and the guest compound form an inclusion complex and that the inclusion complexes are low soluble, exclusion complexes well soluble.
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Zhou, Wen, and 周雯. "A study of channel estimation for OFDM systems and system capacity forMIMO-OFDM systems." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B45555850.
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Lo, Hong Rui. "System characterisation and identification of non-linear systems (with particular reference to hysteretic systems)." Thesis, University of Southampton, 1988. https://eprints.soton.ac.uk/52277/.
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System identification is the process of building mathematical models of dynamical systems based on observed data. Many effective techniques have been developed for linear systems. For non-linear systems, some progress has been achieved, but techniques for practical use and which can deal with a large class of systems are limited. In particular few identification techniques have been found in the literature which can be applied to hysteretic systems. This thesis is devoted to the development of a system identification technique which can be applied to a relatively large class of non-linear systems, including hysteretic systems. The key to this technique is to select an appropriate subset of the state vector describing the system and generate a non-linear surface in this subspace which characterises the non-linearity. For non-hysteretic systems, this space is the normal state space. For hysteretic systems, the selection of the appropriate space usually needs some prior knowledge about the system. The procedure involves estimating the non-linear component as a function of time. This is approached via a deconvolution method, and a section of this thesis shows how an optimal deconvolution method may be used. The method of creating the surface is described, and identification is then conducted by analysing and fitting the surface. The success of identification is obviously affected by the quality of the surface, which is, in turn, affected by factors such as the type and the level of the excitation, the frequency range and the magnitude of the spectrum of the process, and errors in the signal processing. These problems are discussed in the application of this technique to several simulated non-linear systems (including both non-hysteretic and hysteretic types) and also to the practical case of a cable type vibration isolator.
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Yang, Jun Carleton University Dissertation Geography. "TMDS thematic map design advisory system; for geographical information systems and electronic mapping systems." Ottawa, 1993.
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Boyd, Richard K. "A weapons systems development decision support system." Thesis, Monterey, Calif. : Naval Postgraduate School, 1992. http://handle.dtic.mil/100.2/ADA251791.
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Thesis (M.S. in Information Systems)--Naval Postgraduate School, March 1992.Thesis Advisor: Nakagawa, Gordon. "March 1992." Description based on title screen as viewed on March 4, 2009. Includes bibliographical references (p. 66).
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Erturk, Alper. "An expert system for reward systems design." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2000. http://handle.dtic.mil/100.2/ADA383532.
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Thesis (M.S. in Information Technology Management and M.S. in Systems Management) Naval Postgraduate School, Sept. 2000.Thesis advisor(s): Jansen, Erik; Nissen, Mark E. Includes bibliographical references (p. 93-94). Also available online.
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Tosun, Suleyman. "Reliability-centric system design for embedded systems." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2005. http://wwwlib.umi.com/cr/syr/main.
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Lindblom, Sebastian, and David Johansson. "Automatic System Tests on Airborne Radar Systems." Thesis, Uppsala universitet, Fasta tillståndets elektronik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-340345.
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The aim of this master thesis was to create automated system tests on airborne radar systems. Automated tests can reduce time spent on repetitive and monotone work and instead create time for exploratory testing and customer criteria testing. Nightly builds and well designed tests can improve robustness and create a more stable system for the user. The project started with a pre-study, which consisted of researching the system in question, researching the possibilities of automated tests on said system and different tools that could be used in the project. Furthermore the pre-study contained interviews, visits and workshops within SAAB, with topics including automated tests, automation software and the SAAB GlobalEye system. The solution included two separated tests, one regression test and one startup test. The regression test verifies that selected standard functions works with the new soft/hardware updates and the Startup test verifies that the starting sequences for selected subsystems are executed correctly. Both of these tests were installed in the test laboratory. The tests were separated in to two parts; one control part and one analysis part. By recording the data being sent on the different interfaces while performing the tests, it's made possible to analyze the recorded data. This method enables many tests to be performed on the same set of data. The control part was solved with a third party software, called Squish, from a German company named Froglogic. The analysis part was written in MATLAB, where the test results were presented as well. The chain of events was set up and executed by Jenkins (an open source automation software), which also served as a scheduler, to enable nightly builds.
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Haidar, Ghayath. "Reasoning system for real time reactive systems." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0018/MQ47844.pdf.
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Rutherford, Matthew J. "Adequate system-level testing of distributed systems." Diss., Connect to online resource, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3219039.
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Papalexopoulos, Alexis D. "Modeling techniques for power system grounding systems." Diss., Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/13529.
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Freeman, Isaac. "A modular system for constructing dynamical systems." Thesis, University of Canterbury. Mathematics, 1998. http://hdl.handle.net/10092/8888.
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This thesis discusses a method based on the dual principle of Rössler, and developed by Deng, for systematically constructing robust dynamical systems from lower dimensional subsystems. Systems built using this method may be modified easily, and are suitable for mathematical modelling. Extensions are made to this scheme, which allow one to describe a wider range of dynamical behaviour. These extensions allow the creation of systems that reproduce qualitative features of the Lorenz Attractor (including bifurcation properties) and of Chua's circuit, but which are easily extensible.
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Merritt, John W. "Distributed file systems in an authentication system." Thesis, Kansas State University, 1986. http://hdl.handle.net/2097/9938.
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Keller, James (James Thomas). "System architecture of offshore oil production systems." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/45220.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2008.Includes bibliographical references (p. 117-118).
This thesis presents an approach to applying Systems Architecture methods to the development of large, complex, commercial systems, particularly offshore oil and gas productions systems. The aim of this research was to assist BP in the development of concepts for a multi-billion dollar oil production system, particularly in the unprecedented deep water arctic locations prone to seismic activity, as well as in existing fields that must be extended. The thesis demonstrates that these systems can be decomposed and analyzed using rigorous, methodical system architecture thinking that archives and represents tacit knowledge in several graphical frameworks. The thesis breaks the architecture of oil and gas production systems into two problems. The first problem is the architecture of one facility and one reservoir; a classic problem of assigning function to form. The second problem is the architecture of multiple facilities and multiple reservoirs; a classic problem of connection and routing. For the first problem, the production process is decomposed using Object Process Methodology (OPM). The decompositions provide a methodology to capture industry knowledge that is not always explicitly stated and provides a framework to explore the entire architectural design space. The thesis then describes how these decompositions of general and specific oil systems can be used to develop software models, using the meta-language tool OPN (Object Process Network), that successfully generate thousands of architecture concepts. This set of feasible architectures can be prioritized and better understood using metrics in an effort to down-select to a handful of preferred concepts to be carried forward for more detailed study and eventual development.
(cont.) The approach to the second problem demonstrates that even a modest set of facilities and reservoirs have a huge number of connection possibilities. This space of connection possibilities is large and daunting, and typically is not fully explored. To solve the second problem the thesis presents two models that generate all the possible connection schemes between elements in a system, in this case oil facilities and reservoirs. It is then demonstrated that these possibilities can be prioritized through the use of metrics. The thesis presents a method that can identify new concepts, highlight preferred sets of concepts, and underline patterns common to those concepts. This method increases the architects' overall knowledge and understanding of the entire space of possibilities, and ensures that all options are considered in the development of complex systems.
by James Keller.
S.M.
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Bertrand, Allison R., Michael S. Moore, and Ben A. Abbott. "System Management in Network-Based Telemetry Systems." International Foundation for Telemetering, 2008. http://hdl.handle.net/10150/606174.
Full textAbstract:
ITC/USA 2008 Conference Proceedings / The Forty-Fourth Annual International Telemetering Conference and Technical Exhibition / October 27-30, 2008 / Town and Country Resort & Convention Center, San Diego, CaliforniaNetwork-based telemetry systems are increasingly being used to improve the flexibility and longevity of flight test systems. Modern network-based flight test systems utilize large numbers of devices including high-speed network switches, data acquisition devices, recorders, and telemetry interfaces, all of which must be managed in a coordinated fashion. The move to network-based testing provides the ability to build a standards-based System Management interface which can status and control a diverse set of devices. The benefits include the ability to easily tailor System Management tools to support many different styles of user interactions and to quickly integrate new types of devices. While the new capabilities presented by System Management are exciting, the very openness of the system presents challenges to ensure that future growth will be seamlessly supported. This paper will discuss issues encountered while implementing flight test System Management tools for a network-based telemetry system.
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Sörman, Simon. "System Information Distribution in Massive MIMO Systems." Thesis, Linköpings universitet, Kommunikationssystem, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-129294.
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The 5th generation mobile telecommunication system (5G) is currently being specified and developed, with large expectations on throughput and efficiency. While 4G and more specifically LTE might constitute a basis of the design of the network, there are some parts that should be improved. One thing to improve is the static signalling that occurs very frequently in a 4G network, of which system information such as synchronization signals, detection of network frequencies, operators, configurations etc. is a part. It has been shown that the static signalling requires both much energy and time-frequency resources. Since the system information is not intended for a single user it is always broadcast so that any user, and any amount of users can read it when needed. 5G will use a technique called massive MIMO, where the base station is equipped with a large number of antennas which can be used to direct signals in space, called beamforming. This thesis presents a new method for distribution of system information that can utilize the beamforming capabilities of massive MIMO. A simple model together with simulated user channel statistics from urban 4G scenarios are used to show that the new method outperforms the classical method of only broadcasting the information, with respect to time-frequency resources. Especially if there are high requirements on the latency of the system information, the new method results in a large gain.
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Smith, Barry S. "Integrated inspection system in manufacturing : vision systems /." Master's thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-04272010-020147/.
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Burton, Frank R. "Trade-offs in system of systems acquisition." Thesis, University of York, 2014. http://etheses.whiterose.ac.uk/7686/.
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Large organisations tend to have multiple organisational goals. Example goals for organisations that perform search and rescue might be being able to search large areas quickly, and to provide, for the speedy recovery of survivors. To satisfy these goals, organisations will acquire different resources such as new systems, training programmes, infrastructure and processes. These different resources when combined to meet the same organisational goals, can be considered as a System of Systems (SoS). Organisational goals can be satisfied by completely different resource combinations with each resource combination satisfying the individual goals to varying degrees and with different overall costs. Since organisations only have limited resources available to them, there is an incentive for organisations to find the most efficient resource combinations to satisfy their goals. This can be considered as performing trade-offs in SoS acquisition. There are several open research gaps in performing trade-offs in SoS acquisition. The first is that the resources involved are heterogeneous. How do you compare the benefits of new equipment against new training programmes or organisational structures? The second is the multi-objective nature of the problem with the different organisational goals competing for the same limited budget. The third is managing the problem through-life and maintaining the satisfaction of organisational goals as old system retire and new systems come into service. This thesis presents a model-based technique (with prototype tool support) that combines techniques from the fields of through life capability management, goal modelling, search-based software engineering and model-driven engineering. This technique addresses the three problems stated above allowing decision makers to more efficiently consider the trade-offs involved when performing SoS acquisition. The technique has been evaluated on a realistic case study and on a standard problem found in the field of search-based software engineering.
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Cioran, Anders. "System Integration Testing ofAdvanced Driver Assistance Systems." Thesis, KTH, Reglerteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-175371.
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En viktig faktor for att fortsatta forbattra traksakerheten ar genom att utveckla ochimplementera avancerade forarstodsfunktioner (ADAS) i fordon. Gemensamma aspekterhos de undersokta ADAS ar deras formagor att detektera och undvika farliga traksituationergenom att nyttja sensordata och fordonstillstand for att kontrollera fordonetsforyttning. Nya testmetoder maste overvagas eftersom nyutvecklade ADAS ar mer komplexaoch sakerhetskritiska. Detta arbete undersoker hur man kan testa nya ADAS fran etthelfordonsperspektiv, genom att bland annat ta hansyn till aspekter sasom lampliga testomgivningaroch trakscenarier, och darefter jamfora resultaten med nuvarande testmetoder.Olika typer av ADAS klassikationer har undersokts och kombinerat med egna komplexitetsoch traksakerhets klassikationer har gjort det mojligt att dra slutsatser och foreslagenerella teststrategier for olika ADAS.A key factor to further improve road safety is the development and implementation ofAdvanced Driver Assistance Systems (ADAS) in vehicles. Common aspects of the investigatedADAS' are their abilities of detecting and avoiding hazardous trac situations byusing sensor data and vehicle states in order to control the movement. As more complex andsafety critical ADAS are developed, new test methods have to be considered. This thesisinvestigate how to test new ADAS from a complete vehicle level by considering aspects suchas suitable test environments and trac scenarios, and thereafter compare the results withexisting testing methods. Dierent classications of ADAS have been investigated and combinedwith own classications considering complexity and trac safety aspects, have madeit possible to conclude and propose general test strategies for dierent ADAS.
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Katzenbach, Alfred, and Peyman Merat. "Methodik zum Austausch eines CAD Systems in einem Großunternehmen." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-228005.
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Nach einem 10 bis 15 Jahre dauernden Lebenszyklus besteht die Notwendigkeit große IT-Systeme durch eine neue Generation zu ersetzen. Dabei ist es vom Aufwand her unwesentlich, ob es sich um einen Generationswechsel des gleichen Herstellers handelt oder um die vergleichbare Lösung eines anderen Herstellers. Im beschriebenen Fall hat sich die Daimler AG im November 2010 entschieden auf ein anderes CAD-System zu wechseln und die Migration bis Ende 2016 abzuschließen. Der Beitrag zeigt die Vorgehensweise der Umstellung unter fünf Aspekten:
— Anwendungsmethodik inkl. Datenarchivierung
— Datenmigration
— Use-Case-Absicherung
— Rolloutplanung
— Schulungskonzept
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Becker, Basil. "Architectural modelling and verification of open service-oriented systems of systems." Phd thesis, Universität Potsdam, 2013. http://opus.kobv.de/ubp/volltexte/2014/7015/.
Full textAbstract:
Systems of Systems (SoS) have received a lot of attention recently. In
this thesis we will focus on SoS that are built atop the techniques of
Service-Oriented Architectures and thus combine the benefits and
challenges of both paradigms. For this thesis we will understand SoS
as ensembles of single autonomous systems that are integrated to a
larger system, the SoS. The interesting fact about these systems is
that the previously isolated systems are still maintained, improved
and developed on their own. Structural dynamics is an issue in SoS, as
at every point in time systems can join and leave the ensemble. This
and the fact that the cooperation among the constituent systems is not
necessarily observable means that we will consider these systems as open systems.
Of course, the system has a clear boundary at each point in time, but
this can only be identified by halting the complete SoS. However,
halting a system of that size is practically impossible. Often SoS
are combinations of software systems and physical systems. Hence a
failure in the software system can have a serious physical impact what
makes an SoS of this kind easily a safety-critical system.
The contribution of this thesis is a modelling approach that extends
OMG's SoaML and basically relies on collaborations and roles as an
abstraction layer above the components. This will allow us to describe
SoS at an architectural level. We will also give a formal semantics
for our modelling approach which employs hybrid graph-transformation
systems. The modelling approach is accompanied by a modular
verification scheme that will be able to cope with the complexity
constraints implied by the SoS' structural dynamics and size. Building such autonomous systems as SoS without evolution at the architectural level --- i. e. adding and removing of components and services --- is inadequate. Therefore our approach directly supports the modelling and verification of evolution.Systems of Systems (SoS) sind ein seit längerem bekanntes Konzept, das jedoch in letzter Zeit vermehrt Aufmerksamkeit erhielt. Das Hauptaugenmerk dieser Arbeit wird auf SoS liegen, die mit Hilfe von Techniken aus Service-Orientierten Architekturen erstellt werden. Somit vereinen die hier betrachteten SoS die Vorteile und Herausforderungen beider Paradigmen. SoS können definiert werden als Zusammenschlüsse einzelner, autonomer Systeme, die zu einem größeren System integriert werden. In diesem Zusammenhang interessant ist, dass die ehemals isolierten Systeme nach wie vor isoliert voneinander weiterentwickelt und gewartet werden. Desweiteren kommt der Strukturdynamik innerhalb des SoS eine beachtliche Bedeutung zu, da jederzeit Systeme dem SoS beitreten und es verlassen können. Zusammen mit der Tatsache, dass die Kooperationen zwischen den konstituierenden Systemen nicht immer beobachtbar sind, führt dies dazu, dass wir diese Systeme als offene Systeme bezeichnen. Wobei das System natürlich jederzeit eine klar definierte Grenze besitzt, diese aber nur durch ein Anhalten des Systems zu bestimmen ist. Dies jedoch ist, von einer praktischen Perspektive aus betrachtet, unmöglich. Häufig stellen SoS eine Kombination aus Softwaresystemen und pyhsikalischen Systemen dar mit der Folge, dass ein Fehler in der Software eine SoS schnell eine immense physikalische Wirkung entwickeln kann. Von daher fallen SoS leicht in die Klasse der sicherheitskritischen Systeme. In dieser Arbeit werden wir einen Modellierungsansatz vorstellen, der die Sprache SoaML der OMG erweitert. Die grundlegenden Konzepte dieses Ansatzes sind die Modellierung mit Kollaborationen und Rollen als Abstraktionsebene über Komponenten. Der vorgestellte Ansatz erlaubt es uns SoS auf einer architekturellen Ebene zu betrachten. Die formale Semantik unseres Modellierungsansatzes ist durch hybride Graphtransformationssysteme gegeben. Abgestimmt auf die Modellierung werden wir ebenfalls ein Verfahren zu Verifikation von SoS vorstellen, welches trotz der inhärenten Komplexität von SoS, diese zu verifizieren. Die Modellierung und Verifikation von Evolution wird von unserem Ansatz direkt unterstützt.
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Kraut, Suso. "Multistable systems under the influence of noise." Phd thesis, [S.l.] : [s.n.], 2001. http://pub.ub.uni-potsdam.de/2002/0011/kraut.pdf.
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Wang, Limin. "Modeling and real-time feedback control of MEMS device." Morgantown, W. Va. : [West Virginia University Libraries], 2004. https://etd.wvu.edu/etd/controller.jsp?moduleName=documentdata&jsp%5FetdId=3711.
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Thesis (Ph. D.)--West Virginia University, 2004.Title from document title page. Document formatted into pages; contains v, 132 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 128-132).
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Öhlund, Martin. "Ekonomisk Optimering av Systemtemperaturer i Radiatorsystem." Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-176210.
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Systemtemperaturer i värmesystem är en debatterad fråga i Sverige. Vid projektering av ett värmesystem har valet av systemtemperatur en avgörande roll för kostnaden av värmesystemet. Frågan vilka systemtemperaturer i värmesystemen som är det mest ekonomiska är viktig för att värmesystemet ska ha en fördel jämfört med konkurrenterna på marknaden. Historiskt sett har systemtemperaturerna i de svenska värmesystemen varit 80/60 medans idag är den vanligaste temperaturerna 55/45. Under 60-talet stod Östen Sandberg som förespråkare för ett nytänkande värmesystem kallat lågflödesystem (LF). Detta värmesystem använder sig av låga flöden i rörledningarna och stora temperaturskillnader på framledningen och returledningen. Förespråkare av dessa lågflödesystem hävdar att vid rätt användning kan en omjustering av det befintliga värmesystemet från ett högflödesystem (HF) till ett lågflödesystem drastigt reducera energiförbrukningen för fastigheten och samtidigt uppnå acceptabla inomhusförhållanden. Hade ett LFsystem kunnat konkurrera mot ett HFsystem ekonomiskt? För att undersöka detta kommer ett 55/45-HFsystem att användas som ursprungsfall vid jämförelser mellan HFsystem och LFsystem med olika systemtemperaturer för att utreda om ett 55/45-HFsystem är det mest ekonomiska värmesystemet. Studien visar många fördelar med 55/45-HFsystemet. Ett 55/45-HFsystem har relativt låga investeringskostnader vid projekteringen i jämförelse med de andra värmesystemen. En annan fördel är att detta värmesystem är kompatibelt med både fjärrvärme samt bergvärme vilket gör detta system passande som ett standardiserat värmesystem. Det mest ekonomiska värmesystemet är ett 80/60-HFsystem, vilket har lägre investeringskostnader för både radiatorer samt rörkostnader. Förespråkare av LFsystem hävdar att de reducerade flödena medför reducerade elkostnader för cirkulationspumpen vilket i längden gör LFsystemet energisnålare. Denna studie visar att de reducerade flödena och dess påverkan av energiförbrukningen hos cirkulationspumpen är förhållandevis så låga i jämförelse med de totala energiförbrukningen hos värmesystemet att den möjliga vinsten är försumbar. Däremot kan de reducerade flödena minska risken för en snedfördelad värmefördelning i fastigheten. LFsystemens stora nackdel är ökade investeringskostnader jämfört med HFsystemen.The choice of temperatures in heating systems has long been a question for debate in Sweden. For the design engineer, the choice of system temperatures in a heating system has a decisive impact on the cost and in order to stay competitive on the market it is crucial to design the heating system as cost effective as possible. Historically the system temperature in Swedish heating systems has been 80/60 but today we see that the most common temperatures are 55/45. During the 1960´s Östen Sandberg became the leading advocate for a new type of heating system using a low flow principle (LF) for heat distribution. The LF principle requires a larger temperatur difference between the supply and return temperatures for the adequate heating. Advocates of the LF principle claims that large energy savings are possible if an exsisting high flow heating system (HF) undergoes an adjustment to a LF heating system. The question is how accurate is this claim? This article shows many advantages with the nowadays common 55/45-HFsystem. A 55/45-HFsystem has relatively low investment costs in comparison with other types of heating systems. Another advantage is the fact that the 55/45-HFsystem is compatible with both district heating and geothermal heat pump heating systems which makes this radiator system suitable as a standardized system. The most economical radiator system is the 80/60-HFsystem, which has a lower investment cost for both radiators and piping in comparison with a 55/45-HFsystem. The claim that LFsystems and the associated LF principle could result in a reduced energy cost for the heating system was not supported. This article shows that the energy savings that comes from the LF principle is negligible in comparison with the heating systems total energy cost. The LF principle could however reduce the risk of an uneven heating distribution in the building due to a more unpredictable regulation of the flow through the radiators. LFsystem disadvantage is an general overall larger investment cost in comparison with a HFsystem.
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Devereaux, Jaime E. (Jaime Erin). "Obsolescence : a systems engineering and management approach for complex systems." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/59233.
Full textAbstract:
Thesis (S.M. in System Design and Management)--Massachusetts Institute of Technology, Engineering Systems Division, Technology and Policy Program, 2010.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 79-81).
Obsolescence mitigation is an increasingly important aspect of large systems development & maintenance that has often only been considered once obsolescence is imminent. For long lifecycle systems, this has become a major concern as the lifecycles of the components that are encompassed within these systems are often far shorter - up to ten times shorter - than the overall system lifecycle. Many defense systems can be characterized in this manner and therefore require obsolescence mitigation approaches to ensure the continuing ability for the system to perform and evolve. Current system-level obsolescence mitigation practices make recommendations for designing new systems to slow the onset of obsolescence and make the system more flexible when change for obsolescence is required. However, currently fielded systems were often not designed with this in mind. Other obsolescence mitigation techniques focus only on the approach to mitigating component-level obsolescence locally without examining the impact of the change on the system as a whole. This thesis combines the recommended approaches for obsolescence mitigation, the experience and lessons learned for obsolescence mitigation on a real-world case study system gained from interviews with key subject matter experts, along with systems engineering techniques for dealing with engineering change in systems to develop a robust systems engineering and management approach for obsolescence in large complex systems. The thesis provides the reader with a flow chart and a clustered DSM of the tasks along with a checklist that could be used with this obsolescence engineering and management approach.
by Jaime E. Devereaux.
S.M.in System Design and Management
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Kristofersson, Filip, and Sara Elfberg. "Maximizing Solar Energy Production for Västra Stenhagenskolan : Designing an Optimal PV System." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-384723.
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Skolfastigheter is a municipality owned real estate company that manages most of the buildings used for lower education in Uppsala. The company is working in line with the environmental goals of the municipality by installing photovoltaic systems in schools and other educational buildings. Skolfastigheter are planning to install a photovoltaic system in a school in Stenhagen. The purpose of this study is to optimally design the proposed system. The system will be maximized, which in this study entails that the modules will be placed on every part of the roof where the insolation is sufficient. The system will also be grid connected. The design process includes finding an optimal placement of the modules, matching them with a suitable inverter bank and evaluating the potential of a battery storage. Economic aspects such as taxes, subsidies and electricity prices are taken into account when the system is simulated and analyzed. A sensitivity analysis is carried out to evaluate how the capacity of a battery bank affects the self-consumption, self-sufficiency and cost of the system. It is concluded that the optimal system has a total peak power of almost 600 kW and a net present value of 826 TSEK, meaning that it would be a profitable investment. A battery bank is excluded from the optimal design, since increasing the capacity of the bank steadily decreased the net present value and only marginally increased the self-consumption and self-sufficiency of the system.
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Stottlemyer, Alan R., and Kevin M. Hassett. "Open Systems Architecture in a COTS environment." International Foundation for Telemetering, 1996. http://hdl.handle.net/10150/608368.
Full textAbstract:
International Telemetering Conference Proceedings / October 28-31, 1996 / Town and Country Hotel and Convention Center, San Diego, CaliforniaA distributed architecture framework has been developed for NASA at Goddard Space Flight Center (GSFC) as the basis for developing an extended series of space mission support data systems. The architecture is designed to include both mission development and operations. It specifically addresses the problems of standardizing a framework for which commercial off-the-shelf (COTS) applications and infrastructure are expected to provide most of the components of the systems. The resulting distributed architecture is developed based on a combination of a layered architecture, and carefully selected open standards. The layering provides the needed flexibility in mission design to support the wide variability of mission requirements. The standards are selected to address the most important interfaces, while not over constraining the implementation options.
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Zhang, Liqian. "Optimal H2 model reduction for dynamic systems /." Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B21841548.
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Wang, Bo. "Analysis and implementation of time-delay systems and networked control systems." Thesis, University of South Wales, 2008. https://pure.southwales.ac.uk/en/studentthesis/analysis-and-implementation-of-timedelay-systems-and-networked-control-systems(f54e4378-db9b-443d-b505-88b4af5bb72a).html.
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Systems with delays frequently appear in engineering. The presence of delays makes system analysis and control design much more complicated. Networked control systems where the delays are often random are typical cases of such systems. For one particular category of time-delays systems, integral processes with dead time (IPDTs), the control limits that a PI controller can achieve are discussed in this thesis. These limits include the region of the control parameters to guarantee the system stability, the control parameters to achieve the given gain and/or phase margins (GPMs), the constraint on achievable gain and phase margins, the performance of set point tracking and disturbance rejection. Three types of PI controllers, namely typical PI controller, single tuning-parameter PI controller and PI controller under two-degree-of-freedom (2-DOF) structure, are studied. In control schemes of the modified Smith predictor (MSP) where the controller usually includes a distributed delay, the system implementation is not trivial because of the inherent hidden unstable poles. This thesis provides an estimation of the minimal number of implementation steps for the distributed delay in linear control laws. This is obtained by solving an inequality with respect to the number of implementation steps. A coarse estimation is given as the initial value to solve the inequality using bisection algorithms. A minimization process as well as some other techniques are also introduced to further improve the estimation. In networked control systems, the network-transmission delay and data dropout are combinedly represented by a network-induced delay. By designing a data pre processing mechanism, the network-induced delay can be assigned. Such delay as signment is applied to networked predictive control schemes, which alleviates systemstability limits on the network-induced delay. Two stability criteria are given for the closed-loop system with random network-induced delay, and a resulting implementation algorithm is also provided. The control and implementation of a magnetic levitation system over the network is studied in this thesis. Firstly, a test-rig which is suitable to implement control over a network is set up. Feedback linearization and direct local linearization methods for the nonlinear MagLev system are presented. In order to improve the control performance, a networked predictive method is employed, where the system model is identified in real-time. Local control and networked control are implemented on this test-rig, including networked predictive control. Model predictive control demonstrates a clear performance advantage over the networked control strategies which does not incorporate compensation for the network-induced delay. In order to quickly implement networked control systems (NCSs) by simulation or practical application, a MATLAB/Simulink based NCS toolbox is developed. This toolbox incorporates basic parts of a general NCS, that is, network simulation, network interface, plant interface and typical control schemes. With the NCS toolbox, users can focus on the study of new control schemes.
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Rafiliu, Sergiu. "Stability of Adaptive Distributed Real-TimeSystems with Dynamic Resource Management." Doctoral thesis, Linköpings universitet, Programvara och system, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-98721.
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Today's embedded distributed real-time systems, are exposed to large variations in resource usage due to complex software applications, sophisticated hardware platforms, and the impact of their run-time environment. As eciency becomes more important, the applications running on these systems are extended with on-line resource managers whose job is to adapt the system in the face of such variations. Distributed systems are often heterogeneous, meaning that the hardware platform consists of computing nodes with dierent performance, operating systems, and scheduling policies, linked through one or more networks using dierent protocols. In this thesis we explore whether resource managers used in such distributed embedded systems are stable, meaning that the system's resource usage is controlled under all possible run-time scenarios. Stability implies a bounded worst-case behavior of the system and can be linked with classic real-time systems' properties such as bounded response times for the software applications. In the case of distributed systems, the stability problem is particularly hard because software applications distributed over the dierent resources generate complex, cyclic dependencies between the resources, that need to be taken into account. In this thesis we develop a detailed mathematical model of an adaptive, distributed real-time system and we derive conditions that, if satised, guarantee its stability.
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Tuffley, David John. "Towards Improved IS Usability: an Investigation of Technical Writer Facilitating the Communication Between Users and Developer to Overcome Their Differences During the Systems Requirements Analysis." Thesis, Griffith University, 2005. http://hdl.handle.net/10072/366370.
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Poor communication due to cultural differences between IS developers and system users has been cited as one reason why user requirements are not captured to the necessary level of detail and completeness, resulting in lower levels of system usability. This project set out to (a) better understand the nature of the 'gap' that apparently exists between users and developers of systems, especially in relation to the gathering of user requirements, (b) examine the role of the technical writer in relation to Hirschheim and Klein’s (1989) paradigms of the Analyst as Systems Expert and Analyst as Facilitator, (c) explore whether a system can be made more usable (as defined by the SOLE model) by the technical writer acting as a facilitator between user and developer during requirements gathering, and (d) explore factors which influence the problem of developer and user resistance to existing integrative processes. To these ends, an action research project was performed in which the researcher does the work of a technical writer on a commercial software development project in which he is to develop a statement of user requirements after facilitating communication between the project stakeholders, including IS developers and users. The research is designed to allow the researcher to outwardly act in the capacity of a technical writer performing a commercial contract, such that to the client he did not appear to be other than a technical writer. Hence the research site could have been any organisation wanting a technical writer to develop the user requirements for a software development project. The research site is the Energy Trading Department a leading retailer of electricity and gas in Australia. EnergyCorp had been formed some two years earlier to capitalise on newly deregulated markets. The organisation's annual sales at the time were in the region of A$1.5 Billion.Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Computing and Information Technology
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Carroll, Don, Craig Miller, and Don Nickens. "An Object-Oriented Systems Analysis and Design Technique for Telemetry Systems." International Foundation for Telemetering, 1995. http://hdl.handle.net/10150/611496.
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International Telemetering Conference Proceedings / October 30-November 02, 1995 / Riviera Hotel, Las Vegas, NevadaObject Oriented techniques have been successfully applied to all phases of software development including Requirements Analysis, Design, and Implementation. There has been some reluctance to extend the Object paradigm into the System Analysis, Architecture Development, and System Design phases. This is due to reasons generally related to technology immaturity and concerns with applicability. Telemetry systems in particular appear to be somewhat slow in embracing object technology. The Range Standardization and Automation program has integrated proven techniques to successfully produce an Object-oriented Systems Model. This paper presents the techniques and benefits.