Dissertations / Theses on the topic 'Workload modeling and performance evaluation'
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Ali-Eldin, Hassan Ahmed. "Workload characterization, controller design and performance evaluation for cloud capacity autoscaling." Doctoral thesis, Umeå universitet, Institutionen för datavetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-108398.
Rusnock, Christina. "Simulation-Based Cognitive Workload Modeling and Evaluation of Adaptive Automation Invoking and Revoking Strategies." Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5857.
Ph.D.
Doctorate
Industrial Engineering and Management Systems
Engineering and Computer Science
Industrial Engineering
Kreku, J. (Jari). "Early-phase performance evaluation of computer systems using workload models and SystemC." Doctoral thesis, Oulun yliopisto, 2012. http://urn.fi/urn:isbn:9789514299902.
Tiivistelmä Sulautettujen tietokonejärjestelmien suorituskyvyn arviointi muuttuu yhä haastavammaksi järjestelmien kasvavan kompleksisuuden vuoksi. Järjestelmissä on suuri määrä sovelluksia, jotka tarjoavat käyttäjälle palveluita liittyen esimerkiksi telekommunikaatioon, äänen ja videokuvan toistoon, internet-selaukseen ja navigaatioon. Tästä johtuen suoritusalustoilta edellytetään yhä enemmän joustavuutta, skaalautuvuutta ja modulaarisuutta. Suoritusarkkitehtuurit kehittyvät nykyisistä System-on-Chip (SoC) -ratkaisuista Network-on-Chip (NoC) -rinnakkaistietokoneiksi, jotka koostuvat heterogeenisistä alijärjestelmistä. Sovellusten ja suoritusalustan muodostaman järjestelmän suorituskyvyn arviointiin tarvitaan uusia menetelmiä ja työkaluja, joilla kompleksisuutta voidaan hallita. Tässä väitöskirjassa esitettävä ABSOLUT-simulointimenetelmä pienentää suorituskyvyn arvioinnin kompleksisuutta abstrahoimalla sovelluksen toiminnallisuutta työkuormamalleilla, jotka koostuvat kuormaprimitiiveistä suorittimen käskyjen sijaan. Työkuormamalleja voidaan luoda sovellusten spesifikaatioista, mittaustuloksista, suoritusjäljistä tai sovellusten lähdekoodeista. Suoritusalustoista ABSOLUT-menetelmä käyttää yksinkertaisia kapasiteettimalleja toiminnallisten mallien sijaan: suoritinarkkitehtuurit mallinnetaan korkealla tasolla ja tiedonsiirto ja tiedon varastointi mallinnetaan vain suorituskyvyn näkökulmasta. Menetelmä mahdollistaa aikaisen suorituskyvyn arvioinnin, koska malleja voidaan luoda ja simuloida jo ennen valmiin sovelluksen tai suoritusalustan olemassaoloa. ABSOLUT-menetelmää on käytetty useissa erilaisissa kokeiluissa, jotka sisälsivät esimerkiksi matkapuhelimen käyttöä, äänen ja videokuvan toistoa ja tallennusta, 3D-pelin pelaamista ja digitaalista tiedonsiirtoa. Esimerkeissä käytetiin tyypillisiä suoritusalustoja sekä kotitietokoneiden että sulautettujen järjestelmien maailmasta. Lisäksi osa esimerkeistä pohjautui tuleviin tai keksittyihin suoritusalustoihin. Osa simuloinneista on varmennettu vertaamalla simulointituloksia todellisista järjestelmistä saatuihin mittaustuloksiin. Niiden välillä huomattiin keskimäärin 12 prosentin poikkeama, mikä ylittää aikaisen vaiheen suorituskyvyn simulointimenetelmiltä vaadittavan tarkkuuden
Georgiou, Yiannis. "Contributions for resource and job management in high performance computing." Grenoble, 2010. http://www.theses.fr/2010GRENM079.
High Performance Computing is characterized by the latest technological evolutions in computing architectures and by the increasing needs of applications for computing power. A particular middleware called Resource and Job Management System (RJMS), is responsible for delivering computing power to applications. The RJMS plays an important role in HPC since it has a strategic place in the whole software stack because it stands between the above two layers. However, the latest evolutions in hardware and applications layers have provided new levels of complexities to this middleware. Issues like scalability, management of topological constraints, energy efficiency and fault tolerance have to be particularly considered, among others, in order to provide a better system exploitation from both the system and user point of view. This dissertation provides a state of the art upon the fundamental concepts and research issues of Resources and Jobs Management Systems. It provides a multi-level comparison (concepts, functionalities, performance) of some Resource and Jobs Management Systems in High Performance Computing. An important metric to evaluate the work of a RJMS on a platform is the observed system utilization. However, studies and logs of production platforms show that HPC systems in general suffer of significant un-utilization rates. Our study deals with these clusters' un-utilization periods by proposing methods to aggregate otherwise un-utilized resources for the benefit of the system or the application. More particularly this thesis explores RJMS level mechanisms: 1) for increasing the jobs valuable computation rates in the high volatile environments of a lightweight grid context, 2) for improving system utilization with malleability techniques and 3) providing energy efficient system management through the exploitation of idle computing machines. The experimentation and evaluation in this type of contexts provide important complexities due to the inter-dependency of multiple parameters that have to be taken into control. In this thesis we have developed a methodology based upon real-scale controlled experimentation with submission of synthetic or real workload traces
Middlebrooks, Sam E. "The COMPASS Paradigm For The Systematic Evaluation Of U.S. Army Command And Control Systems Using Neural Network And Discrete Event Computer Simulation." Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/26605.
Ph. D.
Peña, Ortiz Raúl. "Accurate workload design for web performance evaluation." Doctoral thesis, Editorial Universitat Politècnica de València, 2013. http://hdl.handle.net/10251/21054.
Peña Ortiz, R. (2013). Accurate workload design for web performance evaluation [Tesis doctoral]. Editorial Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/21054
Palancia
Wojciechowski, Josephine Quinn. "Validation of a Task Network Human Performance Model of Driving." Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/31713.
Master of Science
Emeras, Joseph. "Workload Traces Analysis and Replay in Large Scale Distributed Systems." Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENM081/document.
High Performance Computing is preparing the era of the transition from Petascale to Exascale. Distributed computing systems are already facing new scalability problems due to the increasing number of computing resources to manage. It is now necessary to study in depth these systems and comprehend their behaviors, strengths and weaknesses to better build the next generation.The complexity of managing users applications on the resources conducted to the analysis of the workload the platform has to support, this to provide them an efficient service.The need for workload comprehension has lead to the collection of traces from production systems and to the proposal of a standard workload format. These contributions enabled the study of numerous of these traces. This also lead to the construction of several models, based on the statistical analysis of the different workloads from the collection.Until recently, existing workload traces did not enabled researchers to study the consumption of resources by the jobs in a temporal way. This is now changing with the need for characterization of jobs consumption patterns.In the first part of this thesis we propose a study of existing workload traces. Then we contribute with an observation of cluster workloads with the consideration of the jobs resource consumptions over time. This highlights specific and unattended patterns in the usage of resources from users.Finally, we propose an extension of the former standard workload format that enables to add such temporal consumptions without loosing the benefit of the existing works.Experimental approaches based on workload models have also served the goal of distributed systems evaluation. Existing models describe the average behavior of observed systems.However, although the study of average behaviors is essential for the understanding of distributed systems, the study of critical cases and particular scenarios is also necessary. This study would give a more complete view and understanding of the performance of the resources and jobs management. In the second part of this thesis we propose an experimental method for performance evaluation of distributed systems based on the replay of production workload trace extracts. These extracts, replaced in their original context, enable to experiment the change of configuration of the system in an online workload and observe the different configurations results. Our technical contribution in this experimental approach is twofold. We propose a first tool to construct the environment in which the experimentation will take place, then we propose a second set of tools that automatize the experiment setup and that replay the trace extract within its original context.Finally, these contributions conducted together, enable to gain a better knowledge of HPC platforms. As future works, the approach proposed in this thesis will serve as a basis to further study larger infrastructures
Lundin, Mikael. "Simulating the effects of mental workload on tactical and operational performance in tankcrew." Thesis, Linköping University, Department of Computer and Information Science, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2693.
Battletank crew must perform many diverse tasks during a normal mission: Crewmembers have to navigate, communicate, control on-board systems, and engage with the enemy, to mention a few. As human processing capacity is limited, the crewmembers will find themselves in situations where task requirements, due to the number of tasks and task complexity, exceed their mental capacity. The stress that results from mental overload has documented quantitative and qualitative effects on performance; effects that could lead to mission failure.
This thesis describes a simulation of tankcrew during a mission where mental workload is a key factor to the outcome of mission performance. The thesis work has given rise to a number of results. First, conceptual models have been developed of the tank crewmembers. Mental workload is represented in these models as a behavior moderator, which can be manipulated to demonstrate and predict behavioral effects. Second, cognitive models of the tank crewmembers are implemented as Soar agents, which interact with tanks in a 3D simulated battlefield. The empirical data underlying these models was collected from experiments with tankcrew, and involved first hand observations and task analyses. Afterwards, the model’s behavior was verified against an a priori established behavioral pattern and successfully face validated with two subject matter experts.
Kwok, Alice S. L. "Modeling, simulation, and performance evaluation of telecommunication networks." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0009/MQ41729.pdf.
Gutierrez, Mauricio F. "Masonry heater performance evaluation : efficiency, emissions, and thermal modeling /." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-10062009-020208/.
Wang, Shanshan. "Modeling and Performance Evaluation of Spatially-correlated Cellular Networks." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS079.
In the modeling and performance evaluation of wireless cellular communication, stochastic geometry is widely applied, in order to provide more efficient and accurate solutions. Homogeneous Poisson point process (H-PPP) with identically independently distributed variables, is the most widely used point process to model the spatial locations of base stations (BSs) due to its mathematical tractability and simplicity. For strong spatial correlations between locations of BSs, only point processes (PPs) with spatial inhibitions and attractions can help. However, the long simulation time and weak mathematical tractability make non-Poisson PPs not suitable for system level performance evaluation. Therefore, to overcome mentioned problems, we have the following contributions in this thesis: First, we introduce a new methodology for modeling and analyzing downlink cellular networks, where the base stations constitute a motion-invariant point process that exhibits some degree of interactions among the points. The proposed approach is based on the theory of inhomogeneous Poisson PPs (I-PPPs) and is referred to as inhomogeneous double thinning (IDT) approach. The proposed approach consists of approximating the original motion-invariant PP with an equivalent PP that is made of the superposition of two conditionally independent I-PPPs. The inhomogeneities of both PPs are created from the point of view of the typical user. The inhomogeneities are mathematically modeled through two distance-dependent thinning functions and a tractable expression of the coverage probability is obtained. Sufficient conditions on the parameters of the thinning functions that guarantee better or worse coverage compared with the baseline homogeneous PPP model are identified. The accuracy of the IDT approach is substantiated with the aid of empirical data for the spatial distribution of the BSs. Then, based on the IDT approach, a new tractable analytical expression of mean interference to signal ratio (MISR) of cellular networks where BSs exhibits spatial correlations is introduced.For non-Poisson PPs, we apply proposed IDT approach to approximate the performance of non-Poisson PPs. Taking β-Ginibre point process (β -GPP) as an example, we propose new approximation functions for key parameters in IDT approach to model different degree of spatial inhibition and we successfully prove that MISR for β -GPP is constant under network densification with our proposed approximation functions. We prove that of MISR performance under β-GPP case only depends on the degree of spatial repulsion, i.e., β , regardless of different BS densities. We also prove that with the increase of β or (given fixed γ or β respectively), the corresponding MISR for β-GPP decreases. The new approximation functions and the trends are validated by numerical simulations. Third, we further study meta distribution of the SIR with the help of the IDT approach. Meta distribution is the distribution of the conditional success probability given the point process. We derive and compare the closed-form expression for the b-th moment under H-PPP and non-Poisson PP case. Since the direct computation of the complementary cumulative distribution function (CCDF) for meta distribution is not available, we propose a simple and accurate numerical method based on numerical inversion of Laplace transforms. The proposed approach is more efficient and stable than the conventional approach using Gil-Pelaez theorem. The asymptotic value of CCDF of meta distribution is computed under new definition of success probability. Furthermore, the proposed method is compared with some other approximations and bounds, e.g., beta approximation, Markov bounds and Paley-Zygmund bound. However, the other approximation models and bounds are compared to be less accurate than our proposed method
Lu, Yao. "Propagation Modeling and Performance Evaluation in an Atrium Building." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-177375.
Evans, Jason P. "Dynamics modeling and performance evaluation of an autonomous underwater vehicle." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=19581.
Zhao, Jian. "Performance modeling and evaluation of digital video over wireless networks /." View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?COMP%202003%20ZHAO.
Vita. Includes bibliographical references (leaves 149-160). Also available in electronic version. Access restricted to campus users.
Vattyam, Priya. "Performance Modeling Methodologies using PDL+ and ARC." University of Cincinnati / OhioLINK, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=ucin962373966.
Trevena, Samuel. "Developing and Evaluating a Tool for Automating the Process of Modelling Web Server Workloads : An Explorative Feasibility Study in the Field of Performance Testing." Thesis, Karlstads universitet, Handelshögskolan, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-47784.
Stojanova, Marija. "Performance Modeling of IEEE 802.11 WLANs." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1338.
It is virtually impossible to name all the spheres of society that have been profoundly changed by the widespread of the Internet or to measure its impact inside each sphere. However, a consensus opinion of network experts is that this influence will only grow in the coming years. In the networking community, we are expecting an ever-increasing amount of traffic that will more than ever depend on wireless technologies, specifically Wireless Local Area Networks (WLANs). The increase of traffic volume means that standardization organisms, vendors, and network architects need to come up with solutions for more coverage and capacity for WLANs. Given the distributed nature of resource sharing in 802.11-based WLANs, these solutions can become inefficient when they amount to simply deploying a larger number of resources. Thus, proper configuration and deployment of the networks is crucial to their performance. In this thesis, we propose stochastic performance modeling approaches for WLANs. All our models are designed for unsaturated WLANs with arbitrary topologies. The first three models are based on Markov chains and model the network at a high level of abstraction. Each new model refines its predecessor by being conceptually simpler and at the same time closer to the real system. Our last Markovian model is tailor-made for IEEE 802.11ac WLANs and incorporates channel bonding, MCS indexes, and frame aggregation. The increasing system fidelity of the models and their precision have allowed us to propose several different applications regarding the performance evaluation and configuration of centrally-managed WLANs. In particular, we are interested in issues of fairness and throughput maximization and propose several approaches that can help a network administrator to properly configure a network given a certain performance metric. Our last modeling approach is profoundly different and incorporates a Graph Signal Processing (GSP) method for the performance modeling of WLANs. The need for such modeling arises mostly from scalability issues, as even though our Markovian models' accuracy makes them suitable for many applications, their lack of scalability can sometimes be seen as restrictive. We show that this black box approach can be successfully used for modeling the network and that incorporating WLAN-specific knowledge can help increase the accuracy of the model. The final chapter of this manuscript details the contributions and limitations of each modeling approach we proposed, including a discussion on potential future works and on general practices in the performance evaluation of WLANs
Middlebrooks, Sam E. "Experimental Interrogation Of Network Simulation Models Of Human Task And Workload Performance In A U.S. Army Tactical Operations Center." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/34429.
Master of Science
Nouri, Ayoub. "Rigorous System-level Modeling and Performance Evaluation for Embedded System Design." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GRENM008/document.
In the present work, we tackle the problem of modeling and evaluating performance in the context of embedded systems design. These have become essential for modern societies and experienced important evolution. Due to the growing demand on functionality and programmability, software solutions have gained in importance, although known to be less efficient than dedicated hardware. Consequently, considering performance has become a must, especially with the generalization of resource-constrained devices. We present a rigorous and integrated approach for system-level performance modeling and analysis. The proposed method enables faithful high-level modeling, encompassing both functional and performance aspects, and allows for rapid and accurate quantitative performance evaluation. The approach is model-based and relies on the $mathcal{S}$BIP formalism for stochastic component-based modeling and formal verification. We use statistical model checking for analyzing performance requirements and introduce a stochastic abstraction technique to enhance its scalability. Faithful high-level models are built by calibrating functional models with low-level performance information using automatic code generation and statistical inference. We provide a tool-flow that automates most of the steps of the proposed approach and illustrate its use on a real-life case study for image processing. We consider the design and mapping of a parallel version of the HMAX models algorithm for object recognition on the STHORM many-cores platform. We explored timing aspects and the obtained results show not only the usability of the approach but also its pertinence for taking well-founded decisions in the context of system-level design
Gonzalez, Damian Mark. "Performance modeling and evaluation of topologies for low-latency SCI systems." [Florida] : State University System of Florida, 2000. http://etd.fcla.edu/etd/uf/2000/ane5950/thesis%5F001115.pdf.
Title from first page of PDF file. Document formatted into pages; contains ix, 81 p.; also contains graphics. Abstract copied from student-submitted information. Vita. Includes bibliographical references (p. 79-80).
Wang, Peng. "STOCHASTIC MODELING AND UNCERTAINTY EVALUATION FOR PERFORMANCE PROGNOSIS IN DYNAMICAL SYSTEMS." Case Western Reserve University School of Graduate Studies / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=case1499788641069811.
Nduonyi, Moses Asuquo. "Integrated reservoir study of the Monument Northwest field: a waterflood performance evaluation." Texas A&M University, 2007. http://hdl.handle.net/1969.1/85867.
Wickramarathna, Thamali Dilusha N. "Modeling and Performance Evaluation of a Delay and Marking Based Congestion Controller." Scholarly Repository, 2008. http://scholarlyrepository.miami.edu/oa_theses/101.
Mishra, Amitabh. "Modeling and Performance Evaluation of Wireless Body Area Networks for Healthcare Applications." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1439281330.
Izurieta, Iván Carrera. "Performance modeling of MapReduce applications for the cloud." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2014. http://hdl.handle.net/10183/99055.
In the last years, Cloud Computing has become a key technology that made possible running applications without needing to deploy a physical infrastructure with the advantage of lowering costs to the user by charging only for the computational resources used by the application. The challenge with deploying distributed applications in Cloud Computing environments is that the virtual machine infrastructure should be planned in a way that is time and cost-effective. Also, in the last years we have seen how the amount of data produced by applications has grown bigger than ever. This data contains valuable information that has to be extracted using tools like MapReduce. MapReduce is an important framework to analyze large amounts of data since it was proposed by Google, and made open source by Apache with its Hadoop implementation. The goal of this work is to show that the execution time of a distributed application, namely, a MapReduce application, in a Cloud computing environment, can be predicted using a mathematical model based on theoretical specifications. This prediction is made to help the users of the Cloud Computing environment to plan their deployments, i.e., quantify the number of virtual machines and its characteristics in order to have a lesser cost and/or time. After measuring the application execution time and varying parameters stated in the mathematical model, and after that, using a linear regression technique, the goal is achieved finding a model of the execution time which was then applied to predict the execution time of MapReduce applications with satisfying results. The experiments were conducted in several configurations: namely, private and public clusters, as well as commercial cloud infrastructures, running different MapReduce applications, and varying the number of nodes composing the cluster, as well as the amount of workload given to the application. Experiments showed a clear relation with the theoretical model, revealing that the model is in fact able to predict the execution time of MapReduce applications. The developed model is generic, meaning that it uses theoretical abstractions for the computing capacity of the environment and the computing cost of the MapReduce application. Further work in extending this approach to fit other types of distributed applications is encouraged, as well as including this mathematical model into Cloud services offering MapReduce platforms, in order to aid users plan their deployments.
Luo, Yang, and 羅陽. "Performance modeling and load balancing for Distributed Java Virtual Machine." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B41509043.
Fändriks, Ingrid. "Alternative Methods for Evaluation of Oxygen Transfer Performance in Clean Water." Thesis, Institutionen för informationsteknologi, Department of Information Technology, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-153208.
Wang, Lingling 1971. "Data broadcast in a network of pervasive devices : modeling, scheduling and performance evaluation." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=79270.
Chen, Yuan. "A performance evaluation methodology for pi-Calculus family of multi-process modeling tools /." Available to subscribers only, 2006. http://proquest.umi.com/pqdweb?did=1203587971&sid=19&Fmt=2&clientId=1509&RQT=309&VName=PQD.
Tesfamariam, Semere Daniel. "Configuration Design of a High Performance and Responsive Manufacturing System : Modeling and Evaluation." Doctoral thesis, Stockholm, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-559.
Lynn, Thomas J. "Evaluation and Modeling of Internal Water Storage Zone Performance in Denitrifying Bioretention Systems." Thesis, University of South Florida, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3630914.
Nitrate (NO3-) loadings from stormwater runoff promote eutrophication in surface waters. Low Impact Development (LID) is a type of best management practice aimed at restoring the hydrologic function of watersheds and removing contaminants before they are discharged into ground and surface waters. Also known as rain gardens, a bioretention system is a LID technology that is capable of increasing infliltration, reducing runoff rates and removing pollutants. They can be planted with visually appealing vegetation, which plays a role in nutrient uptake. A modified bioretention system incorporates a submerged internal water storage zone (IWSZ) that includes an electron donor to support denitrification. Modified (or denitrifying) bioretention systems have been shown to be capable of converting NO3 - in stormwater runoff to nitrogen gas through denitrification; however, design guidelines are lacking for these systems, particularly under Florida-specific hydrologic conditions.
The experimental portion of this research investigated the performance of denitrifying bioretention systems with varying IWSZ medium types, IWSZ depths, hydraulic loading rates and antecedent dry conditions (ADCs). Microcosm studies were performed to compare denitrification rates using wood chips, gravel, sand, and mixtures of wood chips with sand or gravel media. The microcosm study revealed that carbon-containing media, acclimated media and lower initial dissolved oxygen concentrations will enhance NO3- removal rates. The gravel-wood medium was observed to have high NO3 - removal rates and low final dissolved organic carbon concentrations compared to the other media types. The gravel-wood medium was selected for subsequent storm event and tracer studies, which incorporated three completely submerged columns with varying depths. Even though the columns were operated under equivalent detention times, greater NO3- removal efficiencies were observed in the taller compared to the shorter columns. Tracer studies revealed this phenomenon was attributed to the improved hydraulic performance in the taller compared to shorter columns. In addition, greater NO3- removal efficiencies were observed with an increase in ADCs, where ADCs were positively correlated with dissolved organic carbon concentrations.
Data from the experimental portion of this study, additional hydraulic modeling development for the unsaturated layer and unsaturated layer data from other studies were combined to create nitrogen loading model for modified bioretention systems. The processes incorporated into the IWSZ model include denitrification, dispersion, organic media hydrolysis, oxygen inhibition, bio-available organic carbon limitation and Total Kjeldahl Nitrogen (TKN) leaching. For the hydraulic component, a unifying equation was developed to approximate unsaturated and saturated flow rates. The hydraulic modeling results indicate that during ADCs, greater storage capacities are available in taller compared to shorter IWSZs Data from another study was used to develop a pseudo-nitrification model for the unsaturated layer. A hypothetical case study was then conducted with SWMM-5 software to evaluate nitrogen loadings from various modified bioretention system designs that have equal IWSZ volumes. The results indicate that bioretention systems with taller IWSZs remove greater NO3- loadings, which was likely due to the greater hydraulic performance in the taller compared to shorter IWSZ designs. However, the systems with the shorter IWSZs removed greater TKN and total nitrogen loadings due to the larger unsaturated layer volumes in the shorter IWSZ designs.
Lynn, Thomas Joseph. "Evaluation and Modeling of Internal Water Storage Zone Performance in Denitrifying Bioretention Systems." Scholar Commons, 2014. https://scholarcommons.usf.edu/etd/5260.
Shah, Krushal S. "Circuit Modeling and Performance Evaluation of GaN Power HEMT in DC-DC Converters." University of Toledo / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1321475503.
Winfrey, Mary Lynn. "Effects of self-modeling on self-efficacy and balance beam performance." Virtual Press, 1992. http://liblink.bsu.edu/uhtbin/catkey/845949.
School of Physical Education
Houston, Edward Brian. "The Use of Stormwater Modeling for Design and Performance Evaluation of Best Management Practices at the Watershed Scale." Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/34850.
The use of best management practices or BMPs to treat urban stormwater runoff has been pervasive for many years. Extensive research has been conducted to evaluate the performance of individual BMPs at specific locations; however, little research has been published that seeks to evaluate the impacts of small, distributed BMPs throughout a watershed at the regional level. To address this, a model is developed using EPA SWMM 5.0 for the Duck Pond watershed, which is located in Blacksburg, Virginia and encompasses much of the Virginia Polytechnic and State Institute's campus and much of the town of Blacksburg as well. A variety of BMPs are designed and placed within the model. Several variations of the model are created in order to test different aspects of BMP design and to test the BMP modeling abilities of EPA SWMM 5.0. Simulations are performed using one-hour design storms and yearlong hourly rainfall traces. From these simulations, small water quality benefits are observed at the system level. This is seen as encouraging, given that a relatively small amount of the total drainage area is controlled by BMPs and that the BMPs are not sited in optimal locations. As expected, increasing the number of BMPs in the watershed generally increases the level of treatment. The use of the half-inch rule in determining the required water quality volume is examined and found to provide reasonable results.
The design storm approach to designing detention structures is also examined for a two-pond system located within the model. The pond performances are examined under continuous simulation and found to be generally adequate for the simulated rainfall conditions, although they do under-perform somewhat in comparison to the original design criteria.
The usefulness of EPA SWMM 5.0 as a BMP modeling tool is called into question. Many useful features are identified, but so are many limitations. Key abilities such as infiltration from nodes or treatment in conduit flow are found to be lacking. Pollutant mass continuity issues are also encountered, making specific removal rates difficult to define.
Master of Science
Voicu, Laura M. "Modeling the Throughput Performance of the SF-SACK Protocol." Scholar Commons, 2006. http://scholarcommons.usf.edu/etd/3904.
Richter, Konstantina [Verfasser], and Reiner [Akademischer Betreuer] Dumke. "Modeling, evaluation and predicting of IT human resources performance / Konstantina Richter. Betreuer: Reiner Dumke." Magdeburg : Universitätsbibliothek, 2012. http://d-nb.info/105391413X/34.
Roberts, Brian J. "Site-specific RSS signature modeling for WiFi localization." Worcester, Mass. : Worcester Polytechnic Institute, 2009. http://www.wpi.edu/Pubs/ETD/Available/etd-050109-120008/.
Keywords: empirical database; WiFi localization; RSS; channel modeling; performance evaluation. Includes bibliographical references (leaves 110-111).
Kota, Pavan Sriharsha. "Mathematical modeling and performance evaluation of soliton-based and non-soliton all-optical WDM systems." Thesis, Montana State University, 2009. http://etd.lib.montana.edu/etd/2009/kota_pavan/Kota_PavanS0509.pdf.
Bamgbopa, Musbaudeen Oladiran. "Modeling And Performance Evaluation Of An Organic Rankine Cycle (orc) With R245fa As Working Fluid." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614367/index.pdf.
s sub-components (pump, evaporator, expander and condenser) are also established. Steady and transient models are developed and analyzed because the unit is considered to work with stable (i.e. solar + boiler) or variable (i.e. solar only) heat input. The unit&rsquo
s heat exchangers (evaporator and condenser) have been identified as critical for the applicable method of analysis (steady or transient). The considered heat resource into the ORC is in the form of solar heated water, which varies between 80-95 0C at a range of mass flow rates between 2-12 kg/s. Simulation results of steady state operation using the developed model shows a maximum power output of around 40 kW. In the defined operation range
refrigerant mass flow rate, hot water mass flow rate and hot water temperature in the system are identified as critical parameters to optimize the power production and the cycle efficiency. The potential benefit of controlling these critical parameters is demonstrated for reliable ORC operation and optimum power production. It is also seen that simulation of the unit&rsquo
s dynamics using the transient model is imperative when variable heat input is involved, due to the fact that maximum energy recovery is the aim with any given level of heat input.
Kota, Pavan Sriharsha. "Mathematical modeling and performance evaluation of soliton-based and non-soliton all-optical WDM systems." Thesis, Montana State University, 2008. http://etd.lib.montana.edu/etd/gsetd/2008/kota_pavan/Kota_PavanS1208.pdf.
Sonntag, Sören [Verfasser]. "Performance Evaluation of Parallel Packet-Processing Architectures Using SystemC-based Modeling and Refinement / Sören Sonntag." Aachen : Shaker, 2007. http://d-nb.info/1170527558/34.
Smith, Kevin Boyd. "Modeling, Performance Evaluation, Calibration, and Path Planning of Point Laser Triangulation Probes in Coordinate Metrology /." The Ohio State University, 1996. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487935125880273.
Zhao, Zhili. "Modeling and estimation techniques for understanding heterogeneous traffic behavior." Diss., Texas A&M University, 2004. http://hdl.handle.net/1969.1/315.
Russell, Brian Eugene. "The Empirical Testing of Musical Performance Assessment Paradigm." Scholarly Repository, 2010. http://scholarlyrepository.miami.edu/oa_dissertations/387.
Van, Zyl Pierrie Jakobus. "Anaerobic digestion of Fischer-Tropsch reaction water : submerged membrane anaerobic reactor design, performance evaluation & modeling." Doctoral thesis, University of Cape Town, 2008. http://hdl.handle.net/11427/4994.
Atasoy, Halil Ibrahim. "Design And Fabrication Of Rf Mems Switches And Instrumentation For Performance Evaluation." Thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/2/12608831/index.pdf.
pull in&rsquo
and &lsquo
pull out&rsquo
voltages of the membranes, switching time and power handling of the devices. Also, failure and degradation of the switches can be monitored using the time domain setup. For these purposes a time domain setup is constructed. Moreover, failure mechanisms of the RF MEMS devices are investigated and a power electronic circuitry is constructed for the biasing of RF MEMS switches. Advantage of the biasing circuitry over the direct DC biasing is the multi-shape, high voltage output waveform capability. Lifetimes of the RF MEMS devices are investigated under different bias configurations. Finally, for measurement of complicated RF MEMS structures composed of large number of switches, a bias waveform distribution network is constructed where conventional systems are not adequate because of the high voltage levels. By this way, the necessary instrumentation is completed for controlling a large scale RF MEMS system.
Hellkvist, Martin. "Performance Evaluation Of Self-Backhaul For Small-Cell 5G Solutions." Thesis, Uppsala universitet, Signaler och System, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-355228.
Mustafa, Hassan M., and Ayoub Al-Hamadi. "On Teaching Quality Improvement of a Mathematical Topic Using Artificial Neural Networks Modeling (With a Case Study)." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-80718.