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Tesi sul tema "Systems analysis"
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1
O'Such, William R. "Information theoretic analysis of multi-stage communication/imaging systems /". Online version of thesis, 1988. http://hdl.handle.net/1850/10568.
Testo completo
2
Yu, Yin. "Analysis of structural vulnerability". Thesis, University of Bristol, 1997. http://hdl.handle.net/1983/7d8392ee-c2b6-4bf1-97d5-c3178bd93d45.
Testo completo
3
Wolting, Duane. "MULTIVARIATE SYSTEMS ANALYSIS". International Foundation for Telemetering, 1985. http://hdl.handle.net/10150/615760.
Testo completoAbstract (sommario):
International Telemetering Conference Proceedings / October 28-31, 1985 / Riviera Hotel, Las Vegas, NevadaIn many engineering applications, a systems analysis is performed to study the effects of random error propagation throughout a system. Often these errors are not independent, and have joint behavior characterized by arbitrary covariance structure. The multivariate nature of such problems is compounded in complex systems, where overall system performance is described by a q-dimensional random vector. To address this problem, a computer program was developed which generates Taylor series approximations for multivariate system performance in the presence of random component variablilty. A summary of an application of this approach is given in which an analysis was performed to assess simultaneous design margins and to ensure optimal component selection.
4
Redmond, Patrick J. "A system of systems interface hazard analysis technique". Thesis, Monterey, Calif. : Naval Postgraduate School, 2007. http://bosun.nps.edu/uhtbin/hyperion.exe/07Mar%5FRedmond.pdf.
Testo completoAbstract (sommario):
Thesis (M.S. in Software Engineering and M.S. in Systems Engineering)--Naval Postgraduate School, March 2007.Thesis Advisor(s): J. Bret Michael, Paul Shebalin. "March 2007." Includes bibliographical references (p. 131-132). Also available in print.
5
Corteggiani, Nassim. "Towards system-wide security analysis of embedded systems". Electronic Thesis or Diss., Sorbonne université, 2020. http://www.theses.fr/2020SORUS285.
Testo completoAbstract (sommario):
Cette thèse se consacre à l'amélioration des techniques d'analyse dynamiques permettant la vérification de logiciels conçus pour des systèmes embarqués, couramment appelé micrologiciel. Au vu de l'augmentation significative de la connectivité des appareils électroniques, les préoccupations concernant leur sécurité s'intensifient. Les conséquences d'une faille de sécurité sur ces appareils peuvent impliquer des répercussions économiques non négligeables et des difficultés techniques importantes pour appliquer un correctif. C’est le cas notamment des amorceurs de code qui sont généralement stockés sur des mémoires mortes et intégrées dans les couches physiques qui constituent le microcontrôleur. Par conséquent, l’analyse de code source spécifique aux systèmes embarqués pendant la phase de production des micro-contrôleurs est cruciale. Cette thèse présente des techniques d'analyse afin de tester la sécurité de composants logiciel et matériel à l'échelle du système. En particulier, nous nous intéressons aux techniques de test basé sur l'émulation partielle dont nous améliorons les capacités avec trois nouvelles approches. Premièrement, Inception un outil d’analyse dynamique permettant d’appliquer des méthodes de tests exhaustifs (exécution symbolique) sur le code source de micrologiciel même lorsque ce dernier dépend de code plus bas niveau (exemple, code binaire ou assembleur). Deuxièmement, une sonde haute performance basé sur le protocol USB 3.0 afin de réduire la latence lors des communications entre l'outil d'analyse et le vrai matériel. Troisièmement, HardSnap une méthode permettant de générer des instantanés des périphériques matériel afin d'augmenter le contrôle et la visibilité lors de l'exécution symbolique. Cet outil permet de réaliser une exploration concurrente de plusieurs chemins d'exécution sans inconsistanceThis thesis is dedicated to the improvement of dynamic analysis techniques allowing the verification of software designed for embedded systems, commonly called firmware. It is clear that the increasing pervasiveness and connectivity of embedded devices significantly increase their exposure to attacks. The consequences of a security issue can be dramatic not least in the economical field, but on the technical stage as well. Especially because of the difficulty to patch some devices. For instance, offline devices or code stored in a mask rom which are read only memory programmed during the chip fabrication. For all these reasons, it is important to thoughtfully test firmware program before the manufacturing process. This thesis presents analysis methods for system-wide testing of security and hardware components. In particular, we propose three impvrovements for partial emulation. First, Inception a dynamic analysis tool to test the security of firmware programs even when mixing different level of semantic (e.g., C/C++ mixed with assembly). Second, Steroids a high performance USB 3.0 probe that aims at minimizing the latency between the analyzer and the real device. Finally, HardSnap a hardware snapshotting method that offers higher visibility and control over the hardware peripherals. It enables testing concurently different execution paths without corrupting the hardware peripherals state
6
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.
Testo completoAbstract (sommario):
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.
7
Thomas, Alex S. M. Massachusetts Institute of Technology. "An analysis of distributed solar fuel systems". Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/76511.
Testo completoAbstract (sommario):
Thesis (S.M. in Engineering and Management)--Massachusetts Institute of Technology, Engineering Systems Division, System Design and Management Program, 2012.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 85-89).
While solar fuel systems offer tremendous potential to address global clean energy needs, most existing analyses have focused on the feasibility of large centralized systems and applications. Not much research exists on the feasibility of distributed solar fuel systems. This thesis is an attempt to understand the larger context of solar fuel systems, to examine the case for going distributed and to critically analyze a distributed solar fuel system available today in the context of a specific application. In doing so, this thesis seeks to a) provide a baseline analysis for the economic feasibility of a distributed solar fuel system based on state-of-the-art technology b) draw some general conclusions about the nature of such systems in order to provide guidance to those engaged in the development of the next generation of solar fuel systems. This study also compares the chosen baseline solar fuel system with a traditional fossil fuel-based alternative and undertakes a cost-to-emissions trade-off analysis. A key finding of this thesis is that for solar fuel systems to be viable, cost and efficiency improvements in individual sub-systems won't be sufficient. Due attention needs to be given to bring down cost of the entire system. Another key finding is that if carbon emissions are considered as a decision-making criterion in addition to cost, even at current cost levels photovoltaic hydrogen systems compare favorably with existing fossil fuel-based alternatives such as diesel generators.
by Alex Thomas.
S.M.in Engineering and Management
8
Helferich, John D. "A systems approach to food accident analysis". Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/70799.
Testo completoAbstract (sommario):
Thesis (S.M. in Engineering and Management)--Massachusetts Institute of Technology, Engineering Systems Division, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 62-68).
Food borne illnesses lead to 3000 deaths per year in the United States. Some industries, such as aviation, have made great strides increasing safety through careful accident analysis leading to changes in industry practices. In the food industry, the current methods of accident analysis are grounded in regulations developed when the food industry was far simpler than today. The food industry has become more complex with international supply chains and a consumer desire for fresher food. This thesis demonstrates that application of a system theoretic accident analysis method, CAST, results in more learning than the current method of accident analysis. This increased learning will lead to improved safety performance in the food production system.
by John D. Helferich.
S.M.in Engineering and Management
9
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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10
Panagiotidis, Petros. "Business systems purpose, analysis". Thesis, Aston University, 1998. http://publications.aston.ac.uk/10706/.
Testo completoAbstract (sommario):
This thesis deals with the problematic of the business systems systemic purpose definition. The definition of the systemic purpose, which is regarded as the utmost expression of the system's purposefulness, is to be achieved by ensuring the participation of all the stakeholders, if possible, who affect or they are affected by the business system's operations. The nature of participation, defined as a process of the stakeholders' perceptual exchanges, is deemed to be problematic in itself due to the influence exerted upon it by organisational power, coercion and false consciousness. The main focus of the thesis then is to make aware and provide the stakeholders with an explicit philosophical pedestal and a set of principles upon which a meta- epistemological framework for the enquiry of the business system's purposeful behaviour is developed. In addition, the thesis focuses on the development of a methodology that can be used by the stakeholders to achieve self-knowledge through the critical and systemic examination of their normative presuppositions, about the business system, at both sociological as well as the psychological levels concurrently and the subsequent development of an organisational intrinsically motivated information system. According to the critical systems philosophy and principles, developed in this thesis, normative presuppositions define the stakeholders' perceptions about the purposeful behaviour of the business system they perceived as having a material, an informational and/or an emacipatory stake (human interest) in. The methodology will provide Information Systems that demonstrably improve coordination of organisational activities by enabling the development and maintenance of a single/multifaceted view of purpose throughout organisations.
11
Bradley, Aaron R. "Safety analysis of systems /". May be available electronically:, 2007. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.
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Tolsma, John E. "Analysis of heteroazenotropic systems". Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9508.
Testo completoAbstract (sommario):
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1999.Includes bibliographical references (p. 305-322).
Separation processes are used extensively in the chemical process industries and by far the most common of these is distillation. Although several alternative strategies have been developed, distillation will likely remain dominant particularly for the largescale separation of non-ideal liquid mixtures. A topic of particular interest in recent years has been heterogeneous azeotropic distillation or heteroazeotropic distillation. This technique is commonly employed to separate azeotropic mixtures by introducing a heterogeneous entrainer that causes liquid-liquid phase separation. Although the design and simulation of heteroazeotropic systems is far more complicated than its homogeneous counterpart, heteroazeotropic distillation is often preferred due to the ease of recovery of the entrainer and the crossing of distillation boundaries due to the liquid-liquid phase split in the decanter. The topic of this thesis is the analysis of heteroazeotropic systems. Specifically, an algorithm has been developed which, under reasonable assumptions, will compute all homogeneous and heterogeneous azeotropes present in a multicomponent mixture predicted by the phase equilibrium model employed. The approach is independent of both the particular representation of the nonideality of the mixture and the topology of the liquid-liquid region. Furthermore, the approach can be readily extended to handle any number of liquid and/or solid phases in equilibrium. Moreover, the heteroazeotrope finding algorithm can be extended to explore the phase equilibrium structure of a multicomponent mixture under system and/or property model parameter variation, including the detection of incipient homogeneous and heterogeneous azeotopes and the determination of the bifurcation values of the parameters where they appear, disappear, or switch between each other. The ability to predict the incipient homogeneous and heterogeneous azeotropes that may appear under different conditions or property parameter values can be incorporated into design algorithms to expand the number of alternative designs. Furthermore, the ability to systematically and efficiently explore the phase equilibrium structure is a valuable tool when fitting property model parameters, allowing the experimentalist to rapidly explore the capabilities and limitations of the phase equilibrium model. The techniques mentioned above are useful when analyzing heteroazetropic systems for design purposes. The second product of this thesis improves the efficiency of the actual simulation of the heteroazeotropic system (or any system for that matter). Specifically, a new class of automatic differentiation methods, known as 'subgraph reduction methods', have been developed that offer substantial improvement over existing techniques both in the increase in speed of the derivative evaluation and the reduction in memory required to store and evaluate the Jacobian matrix of a sparse system of equations. Furthermore, a variant of the subgraph reduction approach has been custom-tailored for use within an interpretive simulator architecture that dramatically increases speed and reduces memory requirements compared to other techniques commonly employed in this environment.
by John Eugene Tolsma.
Ph.D.
13
Carroll, Don, Craig Miller e Don Nickens. "An Object-Oriented Systems Analysis and Design Technique for Telemetry Systems". International Foundation for Telemetering, 1995. http://hdl.handle.net/10150/611496.
Testo completoAbstract (sommario):
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.
14
Venkatesh, G. "Systems performance analysis of Oslo’s water and wastewater system". Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for vann- og miljøteknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-12664.
Testo completoAbstract (sommario):
Introduction: An advanced urban water and wastewater network – from the source of raw water to the sink for the treated effluent wastewater – is, to say the least, a complex one. The interdependencies and interrelationships among the constituent network components make an integrated network analysis as necessary for an as-thorough-as-possible understanding of the system, as a separate analysis of each of the different network components. If sustainable development is to be pursued by urban water and wastewater utilities, a foreknowledge of the evolution of the network to its configuration at the time of the analysis, is a sine qua non. In simple terms, what is observed now, is the result of all that has been done in the past. More specifically, this evolution over time, has called for, and has been associated with, material inflows and outflows, energy consumption and related emissions, environmental impacts along the way, periodic capital investments to extend, expand and upgrade the systems, annual expenses on operation and maintenance, and changes in policies, rules and regulations at the administrative level. Materials and chemicals, energy and money, in addition to time and manual labour, are the ‘factors of production’ employed to fulfil the twin goals of water supply and wastewater treatment. The anthropogenic network components managed and operated by the utilities, are the water treatment plants (WTPs) and wastewater treatment plants (WWTPs), water pipelines, sewage, storm-water and combined-flow pipelines, and water and sewage pumping stations. (It goes without saying that the consumers ‘mid-stream’ linking the water supply subsystem to the wastewater handling sub-system, constitute the raison d’être of the network). Utilities should aim at providing acceptable levels of service to the consumers, while optimising the expenditure of money, the consumption of energy, chemicals and materials, and reducing environmental impacts. This is the triple bottom line approach (social-economic-environmental) which needs to be incorporated into asset management of the 21st century. Background of Oslo: The city ofOslo – the focus of this research – is inhabited by about 600,000 people (as in year-2010); and is serviced by three WTPs of different capacities - Oset, Skullerud and Langlia - drawing raw water from the lakes Maridalsvannet, Elvåga, and Langlivannet, respectively. The treated water from the three WTPs reaches the consumers in the domestic, industrial and commercial sectors of the city through approximately 35,000 water pipes with a total length of over1,500 kilometres. The sewage discharged by the consumers and the storm-water (rainwater and snowmelt) are transported to two WWTPs – BEVAS (Bekkelaget Vann AS) and VEAS (Vestfjorden Avløpselskap) – through more than 54,000 pipes with a total length of around2,200 kilometres. Water and sewage pumping stations pressurise the respective flows. The treated effluent wends its way into theOslofjord, which is contiguous with theAtlantic Ocean. IE tools and methods: The longest time-span considered for the time series analysis is 16 years – for the water and wastewater pipelines. For WTPs and WWTPs, the time window is much shorter - from year-2000 onwards. Material flow analysis (MFA) is performed to study the inflows of pipeline materials into the water and wastewater pipeline networks inOslo. The phenomenon of pipeline stock saturation is discussed vis-à-vis two other Norwegian cities –Trondheim and Tromsø; and an embodied energy analysis (EEA) is performed. Environmental life-cycle assessment (LCA) is carried out with the results of the MFA serving as the platform, to translate the past annual inflows into their associated environmental impacts, and to forecast the impacts that would occur in the future. Life-cycle costing (LCC) is performed in order to emphasize the importance of future investment decisions in, and rehabilitation approaches to the wastewater pipeline network. The flows of, expenses on, and the impacts associated with, chemicals and energy consumption at the WTPs and WWTPs, are analysed as time series. Energy, environmental and economic analyses are performed for the water and sewage pumping stations. Based on the sub-system studies, the system is visualised as a whole, and comparisons among the subsystems are done. The elaborateness of the studies, when it comes to historical (time-series in other words) analyses, is limited only by the non-availability of detailed data, and the aversion to make too many assumptions. Measuring sustainable development: Indicators are useful as metrics in order to measure a water-wastewater utility’s progress towards sustainability. Sustainability or sustainable development, when considered holistically with regard to the urban water and wastewater system, may be looked upon as fourpronged. Social, economic, environmental and functional indicators can be aggregated by using suitable weighting factors to arrive at criteria indices and a grand sustainability index. Time series analyses like the ones referred to in the earlier paragraph will yield indicators as a time series, and enable a systematic measurement of ‘sustainable development’. Targets and benchmarks can be set in order to stimulate progress. There are benefits and pitfalls associated with such an aggregation. Key findings: Useful insights are obtained from the analyses referred to, in the earlier paragraphs. As the water and wastewater pipeline networks evolve towards saturation, the annual environmental impacts decrease over time, and are increasingly dominated by the operation, maintenance and rehabilitation phases. Concrete is the dominant pipe-fabrication material in the wastewater pipeline network, while ferrous metals dominate the water pipeline network. LCC enables one to prove the superiority of a physical lifetime approach over the in-vogue economic lifetime approach, when it comes to economising and managing/utilising the pipeline assets more efficiently. The comparison among Trondheim,Oslo and Tromsø yields an interesting correlation between the population density and the mass of pipeline materials per capita of the population, which needs to be confirmed by obtaining more datasets – from cities within Norway firstly and foreign cities thereafter. The economic and environmental analyses of WTPs and WWTPs in the city give interesting results, when the energy consumption, costs and associated environmental impacts, expressed in terms of per-unit-service-delivered – unit volume of water supplied in the case of water treatment and unit volume of wastewater treated in the case of wastewater treatment – are compared with the corresponding values for chemicals. Eutrophication emerges as the dominant environmental impact when wastewater treatment and effluent discharge are considered, pointing to the possibility of channelling funds towards nutrient removal in the WWTPs, or looking upstream to initiate source control measures to impede the release of nitrogen and phosphorus into the wastewater. The capture and utilisation of biogas has played a significant role in avoiding the production of natural gas and electricity, and the associated environmental impacts. Gleanings: Thinking of the urban water and wastewater system as a single entity composed of interrelated components may possibly be easier on paper, but translating the knowledge of the interconnectedness to the adoption of new approaches to the management of the assets, is beset with numerous challenges. In a complex system in which there are ‘wheels within wheels’, changes or modifications made in one part, may have immediate or delayed effects on the others. Just as the component parts of the system are interconnected, so are the social, economic, environmental and functional aspects of sustainability. The priorities are never the same over time. There are innumerable external factors beyond the control of the utilities – prices of energy and chemicals for instance – which need to be taken into consideration. Sustainable development of urban water and wastewater systems is verily a tight-rope walk. Sustainability studies are never completed. This one is no exception. There are numerous aspects which have not been integrated into the research, owing to time constraints, paucity of data, and the subsequent need for narrowing down the scope. This study would however form the bedrock for consolidations, extensions and forays into more detailed examinations of the system.
15
Chen, Chang-Chih. "System-level modeling and reliability analysis of microprocessor systems". Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/53033.
Testo completoAbstract (sommario):
Frontend and backend wearout mechanisms are major reliability concerns for modern microprocessors. In this research, a framework which contains modules for negative bias temperature instability (NBTI), positive bias temperature instability (PBTI), hot carrier injection (HCI), gate-oxide breakdown (GOBD), backend time-dependent dielectric breakdown (BTDDB), electromigration (EM), and stress-induced voiding (SIV) is proposed to analyze the impact of each wearout mechanism on state-of-art microprocessors and to accurately estimate microprocessor lifetimes due to each wearout mechanism. Taking into account the detailed thermal profiles, electrical stress profiles and a variety of use scenarios, composed of a fraction of time in operation, a fraction of time in standby, and a fraction of time when the system is off, this work provides insight into lifetime-limiting wearout mechanisms, along with the reliability-critical microprocessor functional units for a system. This enables circuit designers to know if their designs will achieve an adequate lifetime and further make any updates in the designs to enhance reliability prior to committing the designs to manufacture.
16
Eriksson, Daniel. "Diagnosability analysis and FDI system design for uncertain systems". Licentiate thesis, Linköpings universitet, Fordonssystem, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-89947.
Testo completoAbstract (sommario):
Our society depends on advanced and complex technical systems and machines, for example, cars for transportation, industrial robots in production lines, satellites for communication, and power plants for energy production. Consequences of a fault in such a system can be severe and result in human casualties, environmentally harmful emissions, high repair costs, or economical losses caused by unexpected stops in production lines. Thus, a diagnosis system is important, and in some applications also required by legislations, to monitor the system health in order to take appropriate preventive actions when a fault occurs. Important properties of diagnosis systems are their capability of detecting and identifying faults, i.e., their fault detectability and isolability performance. This thesis deals with quantitative analysis of fault detectability and isolability performance when taking model uncertainties and measurement noise into consideration. The goal is to analyze diagnosability performance given a mathematical model of the system to be monitored before a diagnosis system is developed. A measure of fault diagnosability performance, called distinguishability, is proposed based on the Kullback-Leibler divergence. For linear descriptor models with Gaussian noise, distinguishability gives an upper limit for the fault to noise ratio of any linear residual generator. Distinguishability is used to analyze fault detectability and isolability performance of a non-linear mean value engine model of gas flows in a heavy duty diesel engine by linearizing the model around different operating points. It is also shown how distinguishability is used for determine sensor placement, i.e, where sensors should be placed in a system to achieve a required fault diagnosability performance. The sensor placement problem is formulated as an optimization problem, where minimum required diagnosability performance is used as a constraint. Results show that the required diagnosability performance greatly affects which sensors to use, which is not captured if not model uncertainties and measurement noise are taken into consideration. Another problem considered here is the on-line sequential test selection problem. Distinguishability is used to quantify the performance of the different test quantities. The set of test quantities is changed on-line, depending on the output of the diagnosis system. Instead of using all test quantities the whole time, changing the set of active test quantities can be used to maintain a required diagnosability performance while reducing the computational cost of the diagnosis system. Results show that the number of used test quantities can be greatly reduced while maintaining a good fault isolability performance. A quantitative diagnosability analysis has been used during the design of an engine misfire detection algorithm based on the estimated torque at the flywheel. Decisions during the development of the misfire detection algorithm are motivated using quantitative analysis of the misfire detectability performance. Related to the misfire detection problem, a flywheel angular velocity model for misfire simulation is presented. An evaluation of the misfire detection algorithm show results of good detection performance as well as low false alarm rate.
17
Roberts, David Anthony. "Discontinuous Systems Analysis: an Interdisciplinary Analysis Tool". Oxford, Ohio : Miami University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=miami1196390609.
Testo completo
18
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.
Testo completoAbstract (sommario):
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.
19
Li, Lu. "New Method for Robotic Systems Architecture Analysis, Modeling, and Design". Case Western Reserve University School of Graduate Studies / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=case1562595008913311.
Testo completo
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Wirsch, Anton. "Analysis of a top-down bottom-up data analysis framework and software architecture design". Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/107346.
Testo completoAbstract (sommario):
Thesis: S.M. in Engineering and Management, Massachusetts Institute of Technology, School of Engineering, Institute for Data, Systems, and Society, System Design and Management Program, 2014.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 70-71).
Data analytics is currently a topic that is popular in academia and in industry. This is one form of bottom-up analysis, where insights are gained by analyzing data. System dynamics is the opposite, a top-down methodology, by gaining insight by analyzing the big picture. The merging of the two methodologies can possibly provide greater insight. What greater insight that can be gained is research that will be required in the future. The focus of this paper will be on the software connections for such a framework and how it can be automated. An analysis of the individual parts of the combined framework will be conducted along with current software tools that may be used. Lastly, a proposed software architecture design will be described.
by Anton Wirsch.
S.M. in Engineering and Management
21
Tang, Xiaoting. "New analytical tools for systems biology". Online access for everyone, 2006. http://www.dissertations.wsu.edu/Dissertations/Fall2006/x_tang_081706.pdf.
Testo completo
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Chung, Ka Kei. "Interactive visual optimization and analysis for RFID system performance /". View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?CSED%202009%20CHUNG.
Testo completo
23
Smith, Philip Hartley. "Electrical Distribution Modeling:An Integration of Engineering Analysis and Geographic Information Systems". Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/36158.
Testo completoAbstract (sommario):
This thesis demonstrates the value of integrating electrical distribution engineering analysis with Geographic Information Systems (GIS). The 37-Node IEEE Feeder model was used as the base distribution system in this study. It was modeled separately, both in software capable of unbalanced load-flow and in an industry-standard GIS environment. Both tools utilized were commercially available, off-the shelf products indicative of those used in academia and in basic GIS installations. The foundational data necessary to build these models is representative of information required by a variety of utility departments for a multitude of applications. It is inherent to most systems within an enterprise-level, business-wide data model and therefore can be used to support a variety of applications. In this instance, infrastructure information is assumed to be managed and housed with the GIS. This data provides the required information as input for load-flow calculations. The engineering analysis is performed within DistributionSystem 4.01 and its output is passed back to the GIS in tabular format for incorporation. This thesis investigates the transfer of information between GIS and DistributionSystem 4.01 and demonstrates the extended display capabilities in the GIS environment. This research is implemented on a small scale, but is intended to highlight the need for standardization and automatic integration of these systems as well as others that are fundamental to the effective management of electrical distribution systems.Master of Science
24
Jensen, Deron Eugene. "System-wide Performance Analysis for Virtualization". PDXScholar, 2014. https://pdxscholar.library.pdx.edu/open_access_etds/1789.
Testo completoAbstract (sommario):
With the current trend in cloud computing and virtualization, more organizations are moving their systems from a physical host to a virtual server.
Although this can significantly reduce hardware, power, and administration costs, it can increase the cost of analyzing performance problems. With virtualization, there is an initial performance overhead, and as more virtual machines are added to a physical host the interference increases between various guest machines. When this interference occurs, a virtualized guest application may not perform as expected. There is little or no information to the virtual OS about the interference, and the current performance tools in the guest are unable to show this interference.
We examine the interference that has been shown in previous research, and relate that to existing tools and research in root cause analysis. We show that in virtualization there are additional layers which need to be analyzed, and design a framework to determine if degradation is occurring from an external virtualization layer. Additionally, we build a virtualization test suite with Xen and PostgreSQL and run multiple tests to create I/O interference. We show that our method can distinguish between a problem caused by interference from external systems and a problem from within the virtual guest.
25
Uddin, Amad. "Development of an integrated interface modelling methodology to support system architecture analysis". Thesis, University of Bradford, 2016. http://hdl.handle.net/10454/15905.
Testo completoAbstract (sommario):
This thesis presents the development and validation of a novel interface modelling methodology integrated with a system architectural analysis framework that emphasises the need to manage the integrity of deriving and allocating requirements across multiple levels of abstraction in a structured manner. The state of the art review in this research shows that there is no shared or complete interface definition model that could integrate diverse interaction viewpoints for defining system requirements with complete information. Furthermore, while existing system modelling approaches define system architecture with functions and their allocation to subsystems to meet system requirements, they do not robustly address the importance of considering well-defined interfaces in an integrated manner at each level of systems hierarchy. This results in decomposition and integration issues across the multiple levels of systems hierarchy. Therefore, this thesis develops and validates following: -Interface Analysis Template as a systematic tool that integrates diverse interaction viewpoints for modelling system interfaces with intensive information for deriving requirements. -Coupling Matrix as an architecture analysis framework that not only allocates functions to subsystems to meet requirements but also promotes consistent consideration of well-defined interfaces at each level of design hierarchy. Insights from the validation of developed approach with engineering case studies within an automotive OEM are discussed, reflecting on the effectiveness, efficiency and usability of the methods.
26
Kreider, David K. "Objectives, principles, and attributes : an approach to methodology development and evaluation for systems engineering /". Master's thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-01262010-020037/.
Testo completo
27
Xiong, Dapeng. "Stability analysis and controller synthesis of linear parameter varying systems /". Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.
Testo completo
28
Siebert, Stefan. "Analysis of arid agricultural systems using quantitative image analysis, modeling and geographical information systems". Kassel : Kassel Univ. Press, 2006. http://nbn-resolving.de/urn:nbn:de:0002-1929.
Testo completo
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Siebert, Stefan. "Analysis of arid agricultural systems using quantitative image analysis, modeling and geographical information systems". Kassel Kassel Univ. Press, 2005. http://deposit.d-nb.de/cgi-bin/dokserv?idn=982924984.
Testo completo
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Inada, Kenichiro. "Analysis of Japanese Software Business". Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/59244.
Testo completoAbstract (sommario):
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. 94-96).
Today, our society is surrounded by information system, computers, and software. It is no exaggeration to say that our daily life depends on software and its function. Accordingly, the business of software has made miraculous growth in the last two decades and is playing a significant role in various industries. In accordance with the growing business needs for effective software and information systems, various firms in various countries have entered the business of software seeking for prosperity. Some have succeeded, some have failed. What distinguishes these firms is its ability to manage and deliver quality products on demand, on time, at a low cost. To achieve such goal, software firms have thought out different methods and tools striving to establish its practice. Nevertheless, many software firms around the globe are struggling to satisfy its clients to achieve business success. With no exception, Japanese software firms are facing difficulties of managing software projects. While its ability to deliver high quality product is well acknowledged among software industry, its high cost structure and schedule delays are thought of as serious problems. Moreover, some of the transitions in the industry are forcing Japanese software firms to seek new opportunities. Therefore, it is important for Japanese software firms to establish more productive ways of developing software products and effective business strategies. Primal objective of this paper is to analyze the present conditions of Japanese software firms and to derive some recommendations which could enhance its current situation. It will also include the discussion of software development practices in US and India firms to better understand strength and weaknesses of Japanese firms and capture some important concepts which can be applied to improve current practice.
by Kenichiro Inada.
S.M.in System Design and Management
31
Qi, Li. "AC system stability analysis and assessment for Shipboard Power Systems". Texas A&M University, 2004. http://hdl.handle.net/1969.1/3128.
Testo completoAbstract (sommario):
The electric power systems in U.S. Navy ships supply energy to sophisticated systems for weapons, communications, navigation and operation. The reliability and survivability of a Shipboard Power System (SPS) are critical to the mission of a Navy ship, especially under battle conditions. When a weapon hits the ship in the event of battle, it can cause severe damage to the electrical systems on the ship. Researchers in the Power System Automation Laboratory (PSAL) at Texas A&M University have developed methods for performing reconfiguration of SPS before or after a weapon hit to reduce the damage to SPS. Reconfiguration operations change the topology of an SPS. When a system is stressed, these topology changes and induced dynamics of equipment due to reconfiguration might cause voltage instability, such as progressive voltage decreases or voltage oscillations. SPS stability thus should be assessed to ensure the stable operation of a system during reconfiguration.
In this dissertation, time frames of SPS dynamics are presented. Stability problems during SPS reconfiguration are classified as long-term stability problems. Since angle stability is strongly maintained in SPS, voltage stability is studied in this dissertation for SPS stability during reconfiguration. A test SPS computer model, whose simulation results were used for stability studies, is presented in this dissertation. The model used a new generalized methodology for modeling and simulating ungrounded stiffly grounded power systems.
This dissertation presents two new indices, a static voltage stability index (SVSILji) and a dynamic voltage stability index (DVSI), for assessing the voltage stability in static and dynamic analysis. SVSILji assesses system stability by all lines in SPS. DVSI detects local bifurcations in SPS. SVSILji was found to be a better index in comparison with some indices in the literature for a study on a two-bus power system. Also, results of DVSI were similar to the results of conventional bifurcation analysis software when applied to a small power system. Using SVSILji and DVSI on the test SPS computer model, three of four factors affection voltage stability during SPS reconfiguration were verified. During reconfiguration, SVSILji and DVSI are used together to assess SPS stability.
32
Greenwood, David. "Socio-technical analysis of system-of-systems using responsibility modelling". Thesis, University of St Andrews, 2012. http://hdl.handle.net/10023/3176.
Testo completoAbstract (sommario):
Society is challenging systems engineers by demanding increasingly complex and integrated IT systems (Northrop et al., 2006; RAE, 2004) e.g. integrated enterprise resource planning systems, integrated healthcare systems and business critical services provisioned using cloud based resources. These types of IT system are often systems-of-systems (SoS). That is to say they are composed of multiple systems that are operated and managed by independent parties and are distributed across multiple organisational boundaries, geographies or legal jurisdictions (Maier, 1998). SoS are notorious for becoming problematic due to interconnected technical and social issues. Practitioners claim that they are ill equipped to deal with the sociotechnical challenges posed by system-of-systems. One of these challenges is to identify the socio-technical threats associated with building, operating and managing systems whose parts are distributed across organisational boundaries. Another is how to troubleshoot these systems when they exhibit undesirable behaviour. This thesis aims to provide a modelling abstraction and an extensible technique that enables practitioners to identify socio-technical threats prior to implementation and troubleshoot SoS post-implementation. This thesis evaluates existing modelling abstractions for their suitability to represent SoS and suggests that an agent-responsibility based modelling abstraction may provide a practical and scalable way of representing SoS for socio-technical threat identification and troubleshooting. The practicality and scalability of the abstraction is explored through the use of case studies that motivate the extension of existing responsibility-based techniques so that new classes of system (coalitions-of-systems) and new classes of threat (agent-related threats) may be analysed. This thesis concludes that the notion of ‘responsibility' is a promising abstraction for representing and analysing systems that are composed of parts that are independently managed and maintained by agents spanning multiple organisational boundaries e.g. systems-of-systems, enterprise-scale systems.
33
Pires, Ana Lúcia Lourenço. "Municipal solid waste management system: decision support through systems analysis". Doctoral thesis, Faculdade de Ciências e Tecnologia, 2011. http://hdl.handle.net/10362/7509.
Testo completoAbstract (sommario):
Thesis submitted to the Universidade Nova de Lisboa, Faculdade de Ciências e Tecnologia for the degree of Doctor of Philosophy in Environmental EngineeringThe present study intends to show the development of systems analysis model applied to solid waste management system, applied into AMARSUL, a solid waste management system responsible for the management of municipal solid waste produced in Setúbal peninsula, Portugal. The model developed intended to promote sustainable decision making, covering the four columns: technical, environmental, economic and social aspects. To develop the model an intensive literature review have been conducted. To simplify the discussion, the spectrum of these systems engineering models and system assessment tools was divided into two broadly-based domains associated with fourteen categories although some of them may be intertwined with each other. The first domain comprises systems engineering models including cost-benefit analysis, forecasting analysis, simulation analysis, optimization analysis, and integrated modeling system whereas the second domain introduces system assessment tools including management information systems, scenario development, material flow analysis, life cycle assessment (LCA), risk assessment, environmental impact assessment, strategic environmental assessment, socio-economic assessment, and sustainable assessment. The literature performed have indicated that sustainable assessment models have been one of the most applied into solid waste management, being methods like LCA and optimization modeling (including multicriteria decision making(MCDM)) also important systems analysis methods. These were the methods (LCA and MCDM) applied to compose the system analysis model for solid waste. The life cycle assessment have been conducted based on ISO 14040 family of norms; for multicriteria decision making there is no procedure neither guidelines, being applied analytic hierarchy process (AHP) based Fuzzy Interval technique for order performance by similarity to ideal solution (TOPSIS). Multicriteria decision making have included several data from life cycle assessment to construct environmental, social and technical attributes, plus economic criteria obtained from collected data from stakeholders involved in the study. The results have shown that solutions including anaerobic digestion in mechanical biological treatment plant plus anaerobic digestion of biodegradable municipal waste from source separation, with energetic recovery of refuse derived fuel (RDF) and promoting pays-as-you-throw instrument to promote recycling targets compliance would be the best solutions to implement in AMARSUL system. The direct burning of high calorific fraction instead of RDF has not been advantageous considering all criteria, however, during LCA, the results were the reversal. Also it refers that aerobic mechanical biological treatment should be closed.
Fundação para a Ciência e Tecnologia - SFRH/BD/27402/2006
34
Lv, Chen. "Damping torque analysis of power system stabiliser in power systems". Thesis, Queen's University Belfast, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.707821.
Testo completoAbstract (sommario):
Nowadays the small-signal angular stability problem caused by insufficient damping of low- frequency oscillations threatens the security and integrity of power grids when the power system is developing towards large or even super large interconnected grids. The low-frequency oscillation often persists for a long period of time, and in some cases it may interrupt stable operation of the power system. One effective way of suppressing the oscillations is that the auxiliary controllers called power system stabilisers (PSS) are installed in the excitation system of generators, to provide additional damping to the low-frequency power oscillations. The work presented in this thesis focuses on applying the damping torque analysis to power systems. The main contributions of the work are the following two aspects. Firstly, by using the damping torque analysis, an in-depth study on the damping contribution and distribution in modern power system is carried out. This study provides valuable detailed information about how and why the damping is distributed in the system as well as identifying the most responsible components to the damping. The results of extended analysis can be used to guide planning, operation and control of power systems, and have great value in practice. Secondly, the work has demonstrated that damping torque analysis is not only useful in studying global model of power systems as it was before, but can also be applied in local model of power systems and the new energy power generation systems (such as the wind power generation system). Hence the work significantly enhances the potential of the damping torque analysis technique in practical applications thereby making it comparable to the conventional method of modal analysis.
35
Whitcomb, Clifford Alan. "Composite system analysis of advanced shipboard electrical power distribution systems". Thesis, Cambridge, Massachusetts : Massachusetts Institute of Technology, 1992. http://handle.dtic.mil/100.2/ADA254851.
Testo completoAbstract (sommario):
Thesis (Nav. E.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1992 and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1992.Thesis Advisor: Kirtley, James L., Jr. "May 1992." Description based on title screen as viewed on March 30, 2009. Includes bibliographical references (p. 73-74). Also available in print.
36
Liles, Stewart Whitfield. "On the characterization and analysis of system of systems architectures". Fairfax, VA : George Mason University, 2008. http://hdl.handle.net/1920/3281.
Testo completoAbstract (sommario):
Thesis (Ph.D.)--George Mason University, 2008.Vita: p. 192. Thesis director: Alexander H. Levis. Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Information Technology. Title from PDF t.p. (viewed Jan. 11, 2009). Includes bibliographical references (p. 184-191). Also issued in print.
37
Wadsworth, Christopher S. "A systems analysis of the Army Substance Abuse Program". Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/100387.
Testo completoAbstract (sommario):
Thesis: S.M. in Engineering and Management, Massachusetts Institute of Technology, Engineering Systems Division, System Design and Management Program, 2015.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 104-105).
The Army Substance Abuse Program is a program within the United States Army that has the mission to deter, detect, and treat substance abuse by US Army Soldiers, Civilians, and Family Members. This thesis examines the program from a systems point of view, using the generic US Army installation for the system boundary, and how the system creates value for the installation enterprise. This thesis first explores the motivation for this research, drawing on contemporary reports from the US Army, published news articles, and my own personal experience. Secondly, I examine the system from a systems architecture perspective, employing design structure matrices or adjacency matrices, based on the normative state of the system codified in US Army Regulations. In doing so, I highlight the important architectural changes within the program since 2001 and determine what aspects of the architecture inhibit the program's performance. Thirdly, I examine the system's dynamic behavior over time and establish a causal loop diagram to explain that behavior, drawing on the US Army's reports, the literature surrounding management response to substance abuse in the workplace, and field interviews. I then examine whether commanders are actually adhering to the required processes and if key commander-driven processes are effective in deterring substance abuse. Concluding, I recommend specific actions that can drive more benefit from the program, particularly from the point of view of leader supervision. The research here suggests a degree of architectural dissonance within the program that may limit performance across the US Army. The choices of data capture, access, and authority across organizational boundaries inhibit real-time supervision through command channels and coordination of medical care. Although actions seem to be mostly in compliance with regulations, the rate of non-referrals after positive drug tests is a notable exception. The rate of testing soldiers seems to have the desired impact on behavior while the impact of other commander-driven actions is mixed.
by Christopher S. Wadsworth.
S.M. in Engineering and Management
38
Moolman, G. Chris. "A relational database management systems approach to system design /". This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-07102009-040421/.
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Wedgwood, Kyle. "Dynamical systems techniques in the analysis of neural systems". Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/13599/.
Testo completoAbstract (sommario):
As we strive to understand the mechanisms underlying neural computation, mathematical models are increasingly being used as a counterpart to biological experimentation. Alongside building such models, there is a need for mathematical techniques to be developed to examine the often complex behaviour that can arise from even the simplest models. There are now a plethora of mathematical models to describe activity at the single neuron level, ranging from one-dimensional, phenomenological ones, to complex biophysical models with large numbers of state variables. Network models present even more of a challenge, as rich patterns of behaviour can arise due to the coupling alone. We first analyse a planar integrate-and-fire model in a piecewise-linear regime. We advocate using piecewise-linear models as caricatures of nonlinear models, owing to the fact that explicit solutions can be found in the former. Through the use of explicit solutions that are available to us, we categorise the model in terms of its bifurcation structure, noting that the non-smooth dynamics involving the reset mechanism give rise to mathematically interesting behaviour. We highlight the pitfalls in using techniques for smooth dynamical systems in the study of non-smooth models, and show how these can be overcome using non-smooth analysis. Following this, we shift our focus onto the use of phase reduction techniques in the analysis of neural oscillators. We begin by presenting concrete examples showcasing where these techniques fail to capture dynamics of the full system for both deterministic and stochastic forcing. To overcome these failures, we derive new coordinate systems which include some notion of distance from the underlying limit cycle. With these coordinates, we are able to capture the effect of phase space structures away from the limit cycle, and we go on to show how they can be used to explain complex behaviour in typical oscillatory neuron models.
40
Xie, Jinsheng. "On the analysis of selected automated storage and retrieval systems". Diss., Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/25020.
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41
Zhao, Ning. "Analysis of priority service systems". Thesis, University of Macau, 2011. http://umaclib3.umac.mo/record=b1027673.
Testo completo
42
MUKAI, Naoto, Masakazu IKEZAKI e Toyohide WATANABE. "Simulation Analysis for Social Systems". INTELLIGENT MEDIA INTEGRATION NAGOYA UNIVERSITY / COE, 2005. http://hdl.handle.net/2237/10432.
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Ahmadi, Hamed. "Distribution systems analysis and optimization". Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/52784.
Testo completoAbstract (sommario):
Distribution systems (DS) are the last stage of any large power system, delivering electricity to the end-users. Conventionally, simplicity of DS operation has been a priority over its optimality. However, with the recent advancements in the automation and measurement infrastructures, it is now possible to improve the efficiency of DS operation. In this dissertation, a load modeling procedure is proposed which takes advantage of the data available at the smart meters. An algorithm is proposed to decompose the load at each customer level using the smart meter measurements. The proposed load model represents the voltage dependence of loads according to the load composition. Based on the voltage-dependent load model, a linear power flow formulation is developed for DS analysis. The linear current flow equations are then proposed which calculate the branch flows directly without requiring the nodal voltages. Sensitivity factors in terms of current transfer and branch outage distribution factors are also derived using the linear power flow concept. The advantages of having a set of linear equations describing the system statics are demonstrated in a variety of DS optimization problems, such as topological reconfiguration, capacitor placement, and volt-VAR optimization. Using the linear current flow equations, the mixed-integer nonlinear programming problem of DS reconfiguration is reformulated into a mixed-integer quadratic/linear programming problem, which substantially reduces the computational burden of the nonlinear combinatorial problem. Besides developing a direct mathematical optimization approach, a fast heuristic method is also developed here for the minimum-loss network reconfiguration based on the minimum spanning tree problem. This heuristic method provides a good suboptimal solution to initialize the direct mathematical optimization approaches such as branch-and-cut algorithm used for solving combinatorial problems. Based on planar graph theory, an efficient mathematical formulation for the representation of the radiality constraint in reconfiguration problems is introduced. It is shown that this formulation is advantageous over the available methods in terms of accuracy and computational efficiency. The proposed algorithms are tested using a variety of DS benchmarks and promising results are achieved.Applied Science, Faculty of
Electrical and Computer Engineering, Department of
Graduate
44
Karamanos, Konstantinos. "Entropy analysis of nonequilibrium systems". Doctoral thesis, Universite Libre de Bruxelles, 2002. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211390.
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45
Gagnon, Gregory. "Dynamic analysis of economic systems". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0019/NQ53728.pdf.
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Liebeherr, Jorg. "Performance analysis of synchronized systems". Diss., Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/9169.
Testo completo
47
Perucic, Michele. "Performance analysis of computer systems". Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=33020.
Testo completoAbstract (sommario):
With an ever-growing and more productive computer industry, the performance of computer systems has become a major concern. Problems related to computer performance usually occur either because the system is not correctly sized or because its resources are not adequately allocated.Performance analysis of computer systems is the process of evaluating the current performance of a system by monitoring and studying its behavior under different loads. It involves a deep understanding of the functioning of the basic components of a system. Performance analysis is typically followed by performance tuning, in which required changes are applied to the system in order to achieve optimum performance.
In this thesis, we discuss the basics of performance analysis. The different resources of a system are described and an overview of performance-monitoring tools for these resources is presented. An application of performance analysis is also included: two new major systems at McGill University are analyzed (the library management system ALEPH and the finance system BANNER).
48
Mottola, Laura. "Systems analysis for robotic mining". Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=23751.
Testo completoAbstract (sommario):
Mining automation has incrementally progressed from line-of-sight remote operation to teleoperation and automatic control of mobile machines, mainly due to significant advances in underground communication systems. The present trend points towards a robotic mining environment where mobile machinery and stationary equipment will be fully integrated with a mine-wide information system overseeing all aspects of mining via a communication network. The successful design and implementation of the software and hardware components necessary to realize this vision depends on the level of seamless integration achieved. The complexity involved in terms of systems functionality and coherence necessitates systems analysis and computer-aided software engineering tools to actively support this integration effort.Hence, the primary objective of this thesis is to introduce and relate systems analysis concepts and tools to the business of mining. This investigation begins by setting the industrial context of this work with respect to past initiatives and future trends. It discusses different approaches to the design and implementation of mining information systems. It reviews the fundamentals of software and information engineering as well as structured and object-oriented analysis and design. It presents a survey of computerized tools for systems analysis. It then applies systems analysis concepts and tools to a high-level top-down analysis of a Mine Information System and examines a specific mining process in detail. Finally, it compares the applicability of structured versus object-oriented analysis and design methodologies to the complex problem of mining.
49
Cui, L. "Reliability analysis of repairable systems". Thesis, Swansea University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636331.
Testo completoAbstract (sommario):
In this thesis five repairable systems are considered for which the formulations of steady-state availability and downtime distribution are presented. The components in the reliability configurations, standby, series systems and R-out-of-N systems, are assumed identical. A finite number of spares, M, is available to install into the system to replace failed items and repair action returns the failed items to a good-as-new state. There is only one server who has to undertake both replacement and repair, the replacement action has priority over repair action. Throughout this thesis the replacement times and repair times are assumed to have general probability distributions. In chapter two, warm waiting is added; the working times of components and lifetimes of warm waiting spares are assumed to have exponential distributions. In chapters 3 and 5, the working times are also distributed exponentially. In chapters 4 and 6 the working system lifetimes are allowed to have general distributions. The stochastic models considered in this thesis are studied using the supplementary variable method. A lot of the equations can be solved by intuitive probabilistic arguments: this makes our results and their processes simple and beautiful. Numerical examples are shown in all chapters, except chapters one and seven. The calculations and simulation were done by using FORTRAN, and many subroutine programs come from the NAG software library.
50
Ham, William K. "Telemetry systems analysis and design". Thesis, Monterey, California: Naval Postgraduate School, 2000. http://hdl.handle.net/10945/7808.
Testo completoAbstract (sommario):
Approved for public release; distribution is unlimitedThe Navy has a valuable opportunity to improve its own products and operations efficiency by showing its future leaders and designers how to design effective and viabletelemetry, tracking, and commanding (TT&C) systems, and their operation. One system is the FLTSAT military communications constellation of spacecraft, one of which has been a static display at the Naval Postgraduate School (NPS) until June, 2000. The primary objective was to make this spacecraft operational and thus provide a new operational spacecraft laboratory for other NPS students. This thesis may also be used as a primer for the space engineering or space operations student regarding TT&C systems design. Great effort has been taken to document and discuss current design practices and standards adopted by DOD laboratories, test facilities, and operations centers. A TT&C system designed for a spacecraft incorporating all the traditional subsystems (payload, thermal, structural, power, TT&C, attitude control) is included.