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1
Mohror, Kathryn Marie. "Scalable event tracking on high-end parallel systems." PDXScholar, 2010. https://pdxscholar.library.pdx.edu/open_access_etds/2811.
Повний текст джерелаАнотація:
Accurate performance analysis of high end systems requires event-based traces to correctly identify the root cause of a number of the complex performance problems that arise on these highly parallel systems. These high-end architectures contain tens to hundreds of thousands of processors, pushing application scalability challenges to new heights. Unfortunately, the collection of event-based data presents scalability challenges itself: the large volume of collected data increases tool overhead, and results in data files that are difficult to store and analyze. Our solution to these problems is a new measurement technique called trace profiling that collects the information needed to diagnose performance problems that traditionally require traces, but at a greatly reduced data volume. The trace profiling technique reduces the amount of data measured and stored by capitalizing on the repeated behavior of programs, and on the similarity of the behavior and performance of parallel processes in an application run. Trace profiling is a hybrid between profiling and tracing, collecting summary information about the event patterns in an application run. Because the data has already been classified into behavior categories, we can present reduced, partially analyzed performance data to the user, highlighting the performance behaviors that comprised most of the execution time.
2
Waqar, Adnan. "Enhancing the capabilities of electronic performance tracking system for applications in sports." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2022. https://ro.ecu.edu.au/theses/2562.
Повний текст джерелаАнотація:
The success of electronic technologies has sparked interest in sports amongst coaches, athletes and sports scientists. Consequently, the sporting world has witnessed a rapid rise in sports technologies in recent years. In sports, technologies can assist in a variety of ways, ranging from winner selection to athlete injury prevention. In recent years, wearable technologies have become popular in sports. Wearable microtechnology devices, commonly known as electronic performance tracking system (EPTS) in sports, can be used to monitor and improve an athlete's performance. EPTSs can also play an important role in injury prevention. This thesis investigates the performance of wearable EPTSs and presents solutions to improve the accuracy of EPTSs in sports.
For an EPTS to capture and accurately quantify important athlete-related parameters, such as speed, distance covered, number and intensity of sprints, change of direction (COD), and positioning and movement, data is of vital importance. Whilst satellite-based positioning systems require a relatively short setup time, their accuracy and reliability are often low. Wearable inertial sensors may be able to track an athlete's movements, but they can also be noisy and their error accumulates over time. Consequently, designing an accurate and wearable EPTS is a complex task and requires critical investigation. This featured as the key motivation for this research, whose findings are presented in this thesis.
In this thesis, a new ultra-wide band (UWB)-based positioning system is proposed to increase the accuracy of an EPTS in indoor sports. A close analysis of real-world experiments is presented, and limitations associated with the UWB-based positioning systems are highlighted. In forming an economical hardware solution, geometric and machine learning algorithms are introduced. The accuracy of the developed solution is compared against conventional positioning systems. To mitigate errors in UWB-based indoor positioning systems, a range error reduction technique is introduced. The optimal hardware setup and complexity for implementing the proposed positioning solution are also discussed.
In order to track an athlete's movements using real-world data, a multi-sensor data fusion approach is introduced for measuring/tracking athletes' change of direction (COD) detection and quantification. This COD data is then used to reduce divergence errors incurred in state estimation-based particle filter algorithms. The developed solution achieves significant improvements as compared to existing techniques. Overall, the proposed EPTS solution offers higher accuracy in tracking an athlete's position and movement data. Further, the proposed solution enables the use of EPTS in indoor environments.
3
Bitilis, Pavlos. "Electronic Performance And Tracking Systems (EPTS) : Perceptions, Benefits and Challenges of Professional Football Athletes and Training Staff." Thesis, Linnéuniversitetet, Institutionen för informatik (IK), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-106888.
Повний текст джерелаАнотація:
Personal Informatics (PI) are information systems that allow people to process activities with the usage of information technology, aiming to produce informational products (data) either for themselves or for others. Technologies that enable PI are becoming increasingly popular, assisting people in collecting personally relevant information about their body and their behaviour. In sports industry nowadays, a great variety of PI wearable tools offer support to athletes and training staff to improve their performance. An example of such tool is the Electronic Performance and Tracking Systems (EPTS), which are a combination of hardware and software that facilitates the collection, storage, analysis and management of professional athletes’ fitness and health data. Although significant and broadly used, EPTS have not yet received much attention from researchers and, thus, understudied. Therefore, the master’s thesis explores the perceptions of professional football athletes and training staff regarding the use of EPTS in their everyday training and work. Furthermore, the master’s thesis research explores the benefits and challenges that professional football athletes and training staff experience when using EPTS in their everyday training and work. The master’s thesis study adopts the interpretive paradigm and qualitative ethnographic approach. The research data was collectedthrough direct observations in the field and semi-structured interviews from Greek professional football athletes and Greek training staff that use wearable EPTS in their everyday training and work and was analysed thematically. A theoretical framework, which is built upon relevant literature from the informatics field and along with the theory of sensemaking, is used to understand, interpret and discuss the research findings. The research outcome of the master’s thesis shows that communication is at the core of EPTS enabling football players and training staff to improve individual and team performance. Organizing of every day starts and ends with EPTS analysis and evaluation and better organized and daily evaluated football methodology appears as key benefit for the club. Coaches and trainers are now more data driven and accurate and analysts and trainers that conduct analysisof the data provided by EPTS are new members of the training staff. Evidence provided by EPTS build trust between staff and players and in the training staff. Visualization tools for presenting insights need to be further improved with the addition of in-field monitors and 3D presentations. Furthermore, it is important for training staff members to have ethical and consistent strategy on how data derived from EPTS are used on how data are communicated. The research complements previous research on personal informatics and adjusts them to elite team sport context and adds to the theory of sensemaking regarding how users make sense of PI tools that are related with their everyday routines at work. In addition, it offers football training staff members a model for efficient use of EPTS technology into the everyday football practices and a model of sustainable use aiming the overall improvement of team performance.
4
Petersson, Markus. "Performance Assessment of Massive MIMO Systems for Positioning and Tracking of Vehicles in Open Highways." Thesis, Linköpings universitet, Kommunikationssystem, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-138839.
Повний текст джерелаАнотація:
The next generation of mobile networks (5G) is currently being standardized, and massive MIMO (Multiple-Input-Multiple-Output) is a strong candidate to be part of this standard. Other than providing higher data rates and lower latency, high accuracy positioning is also required. In this thesis, we evaluate the achievable performance of positioning using massive MIMO systems in open highway scenarios. Relevant theory from sensor array signal processing and Bayesian filtering is presented, and is used in a simulation environment on large antenna arrays representing massive MIMO base stations. Positioning is done by utilizing the uplink pilot reference signals, where the Direction of Arrival (DOA) of the pilot signal is estimated, and then used for position estimation. Estimation of the DOA is done by both a maximum-likelihood method and by using an Extended Kalman Filter (EKF). A positioning error of less than 8 m is achieved with absolute certainty when the vehicle is less than 300 m from the base station. It is also concluded that this result could be improved by using more sophisticated filtering algorithms.
5
Linke, Daniel [Verfasser], Martin [Akademischer Betreuer] Lames, Martin [Gutachter] Lames, Arnold [Gutachter] Baca, and Jonathan [Gutachter] Wheat. "Validation of Electronic Performance Tracking Systems : Methodology, Design & Applications / Daniel Linke ; Gutachter: Martin Lames, Arnold Baca, Jonathan Wheat ; Betreuer: Martin Lames." München : Universitätsbibliothek der TU München, 2019. http://d-nb.info/1201481678/34.
Повний текст джерела
6
Garner, Robin S. "A Comparative Analysis of Data Collection Systems Used in Radiography Educational Programs and the Role Mobile Electronic Devices Play." Digital Commons @ East Tennessee State University, 2015. https://dc.etsu.edu/etd/2592.
Повний текст джерелаАнотація:
Each radiography program has a system to collect important data from didactic and clinical settings in order to accurately assess the progress and success of students, provide the needed student intervention, and provide accreditation agencies with appropriate documentation that demonstrates student success in reaching program learning outcomes. The purpose of this research study was to determine the method of data collection and documentation used by radiography programs to evaluate student progress and to examine if MEDs play a role in evaluating and documenting student skills at the point of care.
The majority of radiography programs in this study were using paper methods for data collection and program directors reported value in using MEDs in clinical education but revealed that barriers still exist and will need to be addressed in order to increase their usage in clinical education.
7
Hawkins, G. J. "Control techniques for electronic beam squint tracking systems." Thesis, University of Bristol, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339823.
Повний текст джерела
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Arraiz, Jose-Ignacio. "Electronic performance measurement systems : feasibility of electronic performance measurement systems : a case study." Thesis, Nottingham Trent University, 2017. http://irep.ntu.ac.uk/id/eprint/34038/.
Повний текст джерелаАнотація:
This thesis explores the possibility of using digital technologies to improve and redefine the performance management process of employees within organisations. A review of the literature indicates that performance processes are not working; a key finding in the literature is the difficulty in collecting the right evidence in order to have the relevant conversation between manager and employee: that is, having access to enough data in order to run the performance measurement. A case study is used to explore two different perspectives: a technical one, looking for accuracy in the performance appraisal, and a social one, for acceptance of the results among the different stakeholders. The main findings of the research are as follows: • Technically, it is possible to gather data about how employees perform at work and develop an algorithm that predicts individual performance, that is: know-how compared with the job profile; behaviours compared with the company values; and output compared with the budget or business plan. • The use of technology to support performance measurement – which is very limited currently – is likely to increase dramatically. With predictive models, performance can be measured, and data be collected at any time. • Like any other new technology, the success of an electronic performance appraisal system depends on the determinants of adoption. These, being complex depend largely upon the different stakeholders, CEO (or eventually the Board), line managers and employees. Each has different interests, perceptions, wills and fears. • In the case study analysed, all stakeholders accepted the concept idea intellectually, an electronic system capable of capturing information and predicting performance at an individual level. However a common fear among line managers is that they will lose control over even basic decisions (i.e. promotion, salary review or bonuses for the consultants). This implies a significant loss of managerial power. • The performance process in most organisations has four different stages: planning, assessment, recognition and career planning. These are usually framed into the budget cycle. • The introduction of technology opens up a new perspective. The measurement phase can be run by the system, in its entirely virtually, and be run at any time. Managers could run performance appraisals and interviews at any time over the year, probably interviewing staff focused on specific issues more; likewise employees may receive feedback more often; the process is disconnected from the recognition phase. The discussion between line manager and employee looks forward rather than backward and focuses on action plans. The research gives practitioners the opportunity to rethink the performance management process, and shows that it is possible to reframe it thanks to technology. As a case study, however, there are still many limitations when generalizing the process.
9
Banerji, Ashok Kumar. "Designing electronic performance support systems." Thesis, Teesside University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239942.
Повний текст джерела
10
Banerji, (Bandyopadhyay) Ashok Kumar. "Designing electronic performance support systems." Boston Spa, United Kindom : British Library Document Supply Centre, 1995. http://ethos.bl.uk/OrderDetails.do?did=1&uin=uk.bl.ethos.239942.
Повний текст джерела
11
Poiesi, Fabio. "Multi-target tracking and performance evaluation on videos." Thesis, Queen Mary, University of London, 2014. http://qmro.qmul.ac.uk/xmlui/handle/123456789/8848.
Повний текст джерелаАнотація:
Multi-target tracking is the process that allows the extraction of object motion patterns of interest from a scene. Motion patterns are often described through metadata representing object locations and shape information. In the first part of this thesis we discuss the state-of-the-art methods aimed at accomplishing this task on monocular views and also analyse the methods for evaluating their performance. The second part of the thesis describes our research contribution to these topics. We begin presenting a method for multi-target tracking based on track-before-detect (MTTBD) formulated as a particle filter. The novelty involves the inclusion of the target identity (ID) into the particle state, which enables the algorithm to deal with an unknown and unlimited number of targets. We propose a probabilistic model of particle birth and death based on Markov Random Fields. This model allows us to overcome the problem of the mixing of IDs of close targets. We then propose three evaluation measures that take into account target-size variations, combine accuracy and cardinality errors, quantify long-term tracking accuracy at different accuracy levels, and evaluate ID changes relative to the duration of the track in which they occur. This set of measures does not require pre-setting of parameters and allows one to holistically evaluate tracking performance in an application-independent manner. Lastly, we present a framework for multi-target localisation applied on scenes with a high density of compact objects. Candidate target locations are initially generated by extracting object features from intensity maps using an iterative method based on a gradient-climbing technique and an isocontour slicing approach. A graph-based data association method for multi-target tracking is then applied to link valid candidate target locations over time and to discard those which are spurious. This method can deal with point targets having indistinguishable appearance and unpredictable motion. MT-TBD is evaluated and compared with state-of-the-art methods on real-world surveillance.
12
Marquez, Florencio. "Standardization in performance assessment of telemetry tracking systems." Thesis, Monterey, California: Naval Postgraduate School, 2013. http://hdl.handle.net/10945/37667.
Повний текст джерелаАнотація:
Approved for public release; distribution is unlimitedIn the world of missile testing, telemetry plays a vital role in the evaluation of these weapon systems. Telemetry is defined as the process of taking measurements from a distance, or remote location. As measurements are made within the missile, the data is packetized and transmitted down to ground stations in real time. Once the data is accumulated, analysts review the data and evaluate the results of the missile test. Launching a missile is a major test event that requires significant coordination and a considerable amount of funding. Collecting as much data as possible is crucial and always a fundamental requirement. Therefore, the telemetry tracking ground stations receiving the data play just as an important role as the missile itself. The ground stations must be reliable systems, where periodic maintenance and technical refreshing are key elements in the risk management of the receiving system. This paper explores the effectiveness of predicting system failures by carefully analyzing antenna data metrics already made available to system users. By establishing a standard for evaluating these tracking systems, variances in the performance metrics over time may predict future system failures. By addressing potential issues preemptively, last-minute critical failures can be significantly reduced while making the systems availability and reliability much higher.
13
Khalid, ObaidUllah. "Performance evaluation for tracker-level fusion in video tracking." Thesis, Queen Mary, University of London, 2017. http://qmro.qmul.ac.uk/xmlui/handle/123456789/25901.
Повний текст джерелаАнотація:
Tracker-level fusion for video tracking combines outputs (state estimations) from multiple trackers, to address the shortcomings of individual trackers. Furthermore, performance evaluation of trackers at run time (online) can determine low performing trackers that can be removed from the fusion. This thesis presents a tracker-level fusion framework that performs online tracking performance evaluation for fusion. We first introduce a method to determine time instants of tracker failure that is divided into two steps. First, we evaluate tracking performance by comparing the distributions of the tracker state and a region around the state. We use Distribution Fields to generate the distributions of both regions and compute a tracking performance score by comparing the distributions using the L1 distance. Then, we model this score as a time series and employ the Auto Regressive Moving Average method to forecast future values of the performance score. A difference between the original and forecast returns the forecast error signal that we use to detect tracking failure. We test the method with different datasets and then demonstrate its flexibility using tracking results and sequences from the Visual Object Tracking (VOT) challenge. The second part presents a tracker-level fusion method that combines the outputs of multiple trackers. The method is divided into three steps. First, we group trackers into clusters based on the spatio-temporal pair-wise relationships of their outputs. Then, we evaluate tracking performance based on reverse-time analysis with an adaptive reference frame and define the cluster with trackers that appear to be successfully following the target as the on-target cluster. Finally, we fuse the outputs of the trackers in the on-target cluster to obtain the final target state. The fusion approach uses standard tracker outputs and can therefore combine various types of trackers. We test the method with several combinations of state-of-the-art trackers, and also compare it with individual trackers and other fusion approaches.
14
Mehrtash, Mostafa. "Performance evaluation of solar tracking photovoltaic systems operating in Canada." Mémoire, École de technologie supérieure, 2013. http://espace.etsmtl.ca/1138/1/MEHRTASH_Mostafa.pdf.
Повний текст джерелаАнотація:
En 2011, la capacité totale installée du Photovoltaïque au Canada était de 289 MW et elle pourrait atteindre entre 9 et 15 GW d'ici 2025. Selon des études antérieures, des systèmes de suivi solaires PV peuvent capturer 20% à 50% plus de rayonnement solaire que les systèmes fixes. Un suiveur solaire est un dispositif qui maintient les panneaux photovoltaïques perpendiculaires aux rayons du soleil. Il y a un manque de connaissances sur la performance des systèmes solaires photovoltaïques de suivi d'exploitation dans les conditions météorologiques sévères du Canada.
Trois objectifs principaux ont été définis pour cette recherche. Le premier objectif est l'évaluation des performances en fonction de la stratégie de suivi pour les systèmes PV. Cet objectif est atteint par la simulation et l'analyse de quatre systèmes PV: horizontal fixe, incliné fixe, suivi selon un axe et suivi selon deux axes. Ces systèmes sont analysés au cours des périodes annuelles, mensuelles et journalières. Quatre villes avec des conditions météorologiques différentes ont été étudiées: Montréal (Canada), Casablanca (Maroc), Ouagadougou (Burkina Faso), et Olympia (USA). Les résultats obtenus à partir de simulations montrent que les systèmes de suivi selon deux axes présentent les rendements les plus élevés dans tous les endroits choisis.
Le deuxième objectif est de déterminer l'orientation optimale d'un système d'exploitation PV dans des conditions climatiques du Canada. Cet objectif est atteint en enquêtant sur la météo et les conditions environnementales du Canada qui touchent les systèmes PV, y compris les basses températures en hiver et le rayonnement réfléchi par la neige (effet albédo). Le rayonnement réfléchi par la neige cumulée sur le sol entraîne une augmentation de l'irradiation des panneaux jusqu'à 4,1%, 5,6% et 6,9% pour les systèmes inclinées, avec suivi selon un axe, et avec suivi selon deux axes pendant l'hiver, respectivement. Les systèmes de suivis selon un axe et deux axes reçoivent 28% et 33% de plus de rayonnement solaire que le système incliné sur un an. De plus, le suivi du soleil pourrait précipiter le phénomène de fusion de la glace et de la neige accumulée sur les panneaux photovoltaïques.
L'objectif final de cette thèse est le choix de la méthode de suivi optimale pour le Canada. Cet objectif est atteint par l'analyse de diverses orientations des systèmes PV dans les jours typiques: une journée d'hiver claire, une claire journée d'été, et une journée nuageuse d’hiver et d’été.
Selon les analyses quotidiennes, le suivi du soleil est efficace les jours de soleil direct (clairs), contre-productif les jours nuageux, et dépend de l'indice de clarté dans les jours très nuageux. Ces résultats sont corroborés par des recherches antérieures. Les résultats permettent de proposer une méthode qui permet de suivre le soleil dans des conditions claires et d’aller à la position horizontale dans des conditions nuageuses. En conditions nuageuses partielles, la stratégie de suivi à adopter dépend de l'indice de clarté et de rayonnement réfléchi par le sol.
15
Diez, Rodrigo J. (Rodrigo Jesus). "High-performance electronic systems for complex LEO missions." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/120897.
Повний текст джерелаАнотація:
Thesis: S.M. in Engineering and Management, Massachusetts Institute of Technology, System Design and Management Program, 2018.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 79-81).
The space industry is experiencing rapid growth in small satellites and reusable launch vehicles. Constellations are in development to enable exciting new applications such as realtime video of the whole planet and broadband internet access provided through constellations of low Earth orbiting (LEO) satellites. Existing Earth observation applications focused on observation imagery, such as weather prediction and disaster relief planning, will have improvements in the quality of their products from increased the resolution of the instruments onboard the satellites and a reduction in the time between acquisitions by using large constellations of LEO small satellites. This increasing demand for performance despite the limited budget of commercial space companies will require solutions beyond the capabilities of current electronic space products. In response to the increasing need for onboard processing, Novo Space, a STAR graduate student startup founded by the author of this thesis, is developing affordable electronic components and systems for complex LEO missions that bridge the gap between the reliability of space-grade components and the performance of commercial off-the-shelf (COTS) parts. This thesis focuses on architectural designs for new space applications using Novo Space ecosystem of SpaceVPX products, the result of research and analysis to meet the new space needs for high-performance space electronics. In particular, we analyze three case studies: a payload subsystem, an avionics subsystem, and a subsystem combining both avionics and payload in the same box. With the aim of furthering our understanding of the SpaceVPX standard and its potential for future space applications, a final example of a laser communication system is analyzed in greater detail.
by Rodrigo J. Diez.
S.M. in Engineering and Management
16
Al-Numay, Mohammed Saleh. "Discrete-time modeling and tracking control of pulse-width modulated systems." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/15387.
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17
Liebeherr, Jorg. "Performance analysis of synchronized systems." Diss., Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/9169.
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18
Kandananond, Karin. "Performance characterization of Integrated Statistical Process Control systems." Diss., Wichita State University, 2007. http://hdl.handle.net/10057/1491.
Повний текст джерелаАнотація:
Business competition requires organizations to increase their products’ quality and reduce cost at the same time. Statistical process control (SPC) techniques are important tools for monitoring process performance over time to detect special causes. Automatic process control (APC) systems, on the other hand, are utilized to regulate performance relative to a specified target. The literature indicates that combining APC and SPC systems result in integrated SPC (ISPC) systems offering an effective approach to process improvement. The objective of this research was twofold. The first objective was aimed at identifying the various process factors likely to affect the long-term performance of ISPC systems. The process considered was one of discrete parts manufacturing characterized by the integrated moving average model IMA (1, 1). A simulation model was developed to represent system performance in terms of the mean squared error (MSE) of the resulting output and the average run length (ARL) of the SPC chart utilized. Simulated results were analyzed to identify influential factors likely to affect the system performance. The second objective targeted the development of criteria for the economic performance of ISPC systems. Two mathematical cost models were developed utilizing Taguchi’s quadratic loss function and accounted for key characteristics of the process and system design factors. These two models were used to derive criteria for the economic selection of the SPC chart design parameters. It is hoped that the proposed criteria will help practitioners select appropriate charting alternatives to minimize the total cost of operation.Thesis (Ph.D.)--Wichita State University, College of Engineering, Dept. of Industrial and Manufacturing Engineering
"December 2007."
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Kandananond, Karin Weheba Gamal. "Performance characterization of Integrated Statistical Process Control systems /." Diss., A link to full text of this thesis in SOAR, 2007. http://hdl.handle.net/10057/1491.
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David, Radu Alin. "Improving Channel Estimation and Tracking Performance in Distributed MIMO Communication Systems." Digital WPI, 2015. https://digitalcommons.wpi.edu/etd-dissertations/229.
Повний текст джерелаАнотація:
This dissertation develops and analyzes several techniques for improving channel estimation and tracking performance in distributed multi-input multi-output (D-MIMO) wireless communication systems. D-MIMO communication systems have been studied for the last decade and are known to offer the benefits of antenna arrays, e.g., improved range and data rates, to systems of single-antenna devices. D-MIMO communication systems are considered a promising technology for future wireless standards including advanced cellular communication systems. This dissertation considers problems related to channel estimation and tracking in D-MIMO communication systems and is focused on three related topics: (i) characterizing oscillator stability for nodes in D-MIMO systems, (ii) the development of an optimal unified tracking framework and a performance comparison to previously considered sub-optimal tracking approaches, and (iii) incorporating independent kinematics into dynamic channel models and using accelerometers to improve channel tracking performance. A key challenge of D-MIMO systems is estimating and tracking the time-varying channels present between each pair of nodes in the system. Even if the propagation channel between a pair of nodes is time-invariant, the independent local oscillators in each node cause the carrier phases and frequencies and the effective channels between the nodes to have random time-varying phase offsets. The first part of this dissertation considers the problem of characterizing the stability parameters of the oscillators used as references for the transmitted waveforms. Having good estimates of these parameters is critical to facilitate optimal tracking of the phase and frequency offsets. We develop a new method for estimating these oscillator stability parameters based on Allan deviation measurements and compare this method to several previously developed parameter estimation techniques based on innovation covariance whitening. The Allan deviation method is validated with both simulations and experimental data from low-precision and high-precision oscillators. The second part of this dissertation considers a D-MIMO scenario with $N_t$ transmitters and $N_r$ receivers. While there are $N_t imes N_r$ node-to-node pairwise channels in such a system, there are only $N_t + N_r$ independent oscillators. We develop a new unified tracking model where one Kalman filter jointly tracks all of the pairwise channels and compare the performance of unified tracking to previously developed suboptimal local tracking approaches where the channels are not jointly tracked. Numerical results show that unified tracking tends to provide similar beamforming performance to local tracking but can provide significantly better nullforming performance in some scenarios. The third part of this dissertation considers a scenario where the transmit nodes in a D-MIMO system have independent kinematics. In general, this makes the channel tracking problem more difficult since the independent kinematics make the D-MIMO channels less predictable. We develop dynamics models which incorporate the effects of acceleration on oscillator frequency and displacement on propagation time. The tracking performance of a system with conventional feedback is compared to a system with conventional feedback and local accelerometer measurements. Numerical results show that the tracking performance is significantly improved with local accelerometer measurements.
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Nelson, Robert B. "Experimental evaluation of performance of conventional bridge systems." abstract and full text PDF (free order & download UNR users only), 2007. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1447696.
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Elshaw, Mark. "An assessment of the performance of electronic odour sensing systems." Thesis, University of Derby, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312607.
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Gatri, Aymen. "Performance optimisation mechanisms for optical wireless communication systems." Thesis, Northumbria University, 2017. http://nrl.northumbria.ac.uk/36263/.
Повний текст джерелаАнотація:
In this day and age, free space optical (FSO) enable the deployment of a new category of products that can transmit voice, data, and video at bandwidths up to 2.5 Gbps at distances up to 4 km, over any protocol. This optical connectivity doesn’t require expensive fibre-optic cable or spectrum licenses. FSO is reliable due to the capability of FSO systems to provide truly broadband and secure communications, as well as their immunity to interference from other sources of optical radiation. The principal challenge facing FSO technology is to achieve 100% link availability in all weather conditions. While rain, fog, haze, turbulence and aerosols all attenuate the optical signal to a certain level, fog is considered to be the main impairment in FSO systems. Thick fog resulting in over 300 dB/km of signal attenuation can reduce the transmission span from a few kilometres to just 100 m or so. Turbulence (i.e. scintillation) also results in reducing fade margins from 4 to 10 dB for FSO links of 1 km length or less, which is well below the margins for atmospheric attenuation. In the real-world environment, it is very challenging to measure the effect of atmospheric fog under diverse circumstances. This is due to several reasons: (i) the longer observation time required and the lower probability of reoccurrence of dense fog events for visibility V < 0.5 km, and (ii) the difficulty in controlling and characterising aerosols in the atmosphere, due to the inhomogeneous presence of aerosols along the FSO link path. This thesis examines and analyses the performance of a terrestrial FSO system by investigating the impact of a number of modulation techniques on mitigating the atmospheric impairments. A dedicated indoor atmospheric chamber is designed to carry out tests and measurements in a controlled manner and mimic the real outdoor atmosphere. The experimental results are compared with predicted data for the range of modulation techniques tested in the presence of atmospheric turbulence and fog, including binary phase shift keying subcarrier intensity modulation (BPSK-SIM), 2-pulse position modulation (2-PPM), 4-pulse position modulation (4-PPM) and hybrid pulse position modulation binary phase shift keying subcarrier intensity modulation (BPSK-SIM-PPM).The results show that BPSK-SIM-PPM offers a similar performance to 2-PPM, a superior performance to BPSK-SIM, while having the same bandwidth, and an inferior performance to 4-PPM under turbulent conditions. Furthermore, the experimental investigation indicates that 4-PPM is more resistant to turbulence compared to BPSK-SIM. The improvement of the link performance by optimising the beam spot size using combinations of mirrors is also investigated. In addition, the effects of low to high visibility on the FSO link BER performance in the presence of fog are measured and investigated. The obtained results indicate the dependency of the performance of the FSO link on the fog intensity variation. Moreover, the experimental results show that the impact of severe fog induced attenuation is greater on the receiver than the transmitter. Finally, the effect of fog on an FSO system employing quadrature phase-shift keying (QPSK) and operating at various carrier wavelengths is also studied.
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Maglieri, Kristen A. "Evaluation of performance under various pay systems." abstract and full text PDF (free order & download UNR users only), 2007. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3258846.
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Douangboupha, Phavanhna. "Mobile web resource tracking during a disaster or crisis situation /." Online version of thesis, 2009. http://hdl.handle.net/1850/10707.
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Kwinana, Zukhanye N. "Email meets issue-tracking: a prototype implementation." Thesis, Rhodes University, 2006. http://hdl.handle.net/10962/d1005644.
Повний текст джерелаАнотація:
The use of electronic mail (email) has evolved from sending simple messages to task delegation and management. Most mail clients, however, have not kept up with the evolution and as a result have limited task management features available. On the other hand, while issue tracking systems offer useful task management functionality, they are not as widespread as emails and also have a few drawbacks. This thesis reports on the exploration of the integration of the ubiquitous nature of email with the task management features of issue-tracking systems. We explore this using simple ad-hoc as well as semi-automated tasks. With these two working together, tasks can be delegated from email clients without needing to switch between the two environments. It brings some of the benefits of issue tracking systems closer to our email users.The system is developed using Microsoft VisuaI Studio.NET. with the code written in C#. The eXtreme Programming (XP) methodology was used during the development of the proof-of-concept prototype that demonstrates the integration of the two environments, as we were faced at first with vague requirements bound to change, as we better understood the problem domain through our development. XP allowed us to skip an extended and comprehensive initial design process and incrementally develop the system, making refinements and extensions as we encountered the need for them. This alleviated the need to make upfront decisions that were based on minimal knowledge of what to expect during development. This thesis describes the implementation of the prototype and the decisions made with each step taken towards developing an email-based issue tracking system. With the two environments working together, we can now easily track issues from our email clients without needing to switch to another system.KMBT_363
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Jareen, Tania. "Improving performance, power, and security of multicore systems using smart cache organization." Thesis, Wichita State University, 2014. http://hdl.handle.net/10057/10964.
Повний текст джерелаАнотація:
The need of multicore/manycore systems for today's world is significantly increasing. But the multicore system is considered to be power-hungry as well as high latency system. Different researches show that it is possible to increase the performance to power ratio by wisely locking the memory blocks inside the cache memory. But this method introduces cache underutilization problem which reduces the effective cache size and also it is hard to configure. Also depending on the processor type, some processor may not have the option of cache locking. Also cache side channel attack and cache interference become a security threat for the cache design. In this paper, a smart cache technique is proposed which decreases the memory access latency and cache power consumption, as well as increases the overall system security. Propose smart victim cache (SVC) between level-1 cache (CL1) and leve-2 cache (CL2) eliminates the cache locking. SVC holds the higher missing memory blocks and also supports stream buffering. For security improvement for the cache, we randomize the cache mapping between main memory and CL1. The randomized cache mapping makes the attacker fool by showing the false positions of the memory blocks in the cache. In the experiment, a quad-core Intel-type system is used, where CL1 is private and CL2 is shared among the cores. A tree based analyzer HEPTANE (Hades Embedded Processor Timing Analyzer) and a system level simulator VisualSim are used on diverse applications (including MPEG-4 and H.264/AVC). From the simulation results, it is seen that 17% of memory access latency and 21% of total power consumption is reduced using SVC comparing with cache locking without using SVC. For 16-block CL1, it is estimated that the probability of cache side channel attack reduces from 40K to 1.Thesis (M.S.)--Wichita State University, College of Engineering, Dept. of Electrical Engineering and Computer Science
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Ward, Gerald Lee. "Electronic Warrant Systems: The Effect of Advanced Technologies on Arrest Performance." ScholarWorks, 2016. https://scholarworks.waldenu.edu/dissertations/2703.
Повний текст джерелаАнотація:
Public safety is negatively affected when arrest warrant information is not available to law enforcement officers, judges, prosecutors, and other criminal justice practitioners. The U.S. Government and the criminal justice community have advocated for electronic warrant systems (e-warrants). Peace officers know that when e-warrant systems deliver warrant information to them immediately from multiple jurisdictions, their safety is increased. However, the factors that cause these e-warrants systems to improve safety are not known. The purpose of this historical data analysis study was to determine if the use of e-warrant systems resulted in shorter clearance times than the use of legacy paper-based systems. Stakeholder theory, open systems theory, and service-oriented architecture theory were used to guide the quantitative research design. This study compared 2 years of historical arrest warrants from 6 sheriffs' departments organized into population matched sets. Two-way ANOVA tests and nonparametric tests were conducted to analyze the impact of the independent variables warrant system type and case type on the dependent variables mean service days and percent warrants served. The study showed that operating e-warrant systems in similar size sample agencies did not ensure shorter mean service days and higher percent warrants served over legacy systems, and it confirmed that more research is needed to determine other factors that will lead to an improvement in these variables. The findings of this study may assist agency executives and justice practitioners to identify other variables that may increase effectiveness of e-warrant systems, thereby improving public and officer safety, both important social benefits.
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Xue, James Wen Jun. "Performance evaluation and resource management in enterprise systems." Thesis, University of Warwick, 2009. http://wrap.warwick.ac.uk/2303/.
Повний текст джерелаАнотація:
This thesis documents research conducted as part of an EPSRC (EP/C53 8277/01) project whose aim was to understand, capture and dene the service requirements of cluster-supported enterprise systems. This research includes developing techniques to verify that the infrastructure is delivering on its agreed service requirements and a means of dynamically adjusting the operating policies if the service requirements are not being met. The research in this thesis falls into three broad categories: 1) the performance evaluation of data persistence in distributed enterprise applications; 2) Internet workload management and request scheduling; 3) dynamic resource allocation in server farms. Techniques for request scheduling and dynamic resource allocation are developed, with the aim of maximising the total revenue from dierent applications run in an Internet service hosting centre. Given that data is one of the most important assets of a company, it is essential that enterprise systems should be able to create, retrieve, update and delete data eectively. Web-based applications require application data and session data, and the persistence of these data is critical to the success of the business. However, data persistence comes at a cost as it introduces a performance overhead to the system. This thesis reports on research using state-of-the-art enterprise computing architectures to study the performance overheads of data persistence. Internet service providers (ISPs) are bound by quality of service (QoS) agreements with their clients. Since dierent applications serve various types of request, each with an associated value, some requests are more important than others in terms of revenue contribution. This thesis reports on the development of a priority, queue-based request scheduling scheme, which positions waiting requests in their relevant queues based on their priorities. In so doing, more important requests are processed sooner even though they may arrive in the system later than others. An experimental evaluation of this approach is conducted using an eventdriven simulator; the results demonstrate promising results over a number of existing methods in terms of revenue contribution. Due to the bursty nature of web-based workload, it is very diffcult to manage server resources in an Internet hosting centre. Static approaches such as resource provisioning either result in wasted resource (i.e., underutilisation in light loaded situations) or oer no help if resources are overutilised. Therefore, dynamic approaches to resource management are needed. This thesis proposes a bottleneck-aware, dynamic server switching policy, which is used in combination with an admission control scheme. The objective this scheme is to optimise the total revenue in the system, while maintaining the QoS agreed across all server pools in the hosting centre. A performance evaluation is conducted via extensive simulation, and the results show a considerable improvement from the bottleneck-aware server switching policy over a proportional allocation policy and a system that implements no dynamic server switching.
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Pati, Nishikanta Guturu Parthasarathy. "Occlusion tolerant object recognition methods for video surveillance and tracking of moving civilian vehicles." [Denton, Tex.] : University of North Texas, 2007. http://digital.library.unt.edu/permalink/meta-dc-5133.
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Nelson, Eric D. "Zoom techniques for achieving scale invariant object tracking in real-time active vision systems /." Online version of the thesis, 2006. https://ritdml.rit.edu/dspace/handle/1850/2620.
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Deegala, Kavindya. "Performance of slotted aloha anti-collision protocol for RFID systems under interfering environments." Thesis, Wichita State University, 2010. http://hdl.handle.net/10057/3476.
Повний текст джерелаАнотація:
Radio Frequency Identification (RFID) is a wireless technology that has replaced
barcodes. This technology is used in today’s world to track assets and people. An RFID system
consists of three components: the tag, the reader, and the middleware. The RFID tag stores data,
the reader is used to identify the data stored in the tag or write data to the tag, and the RFID
middleware is the application that connects the data that the reader obtains from the tag with the
company inventory or database.
Unlike barcode readers, an RFID reader is capable of reading multiple tags located in its
range. When this occurs, the probability of tag collision at the reader’s end is high. To avoid tag
collision, anti-collision protocols are used. Slotted Aloha is one of the main anti-collision
protocols used with RFID.
This thesis proposed a mathematical model and a simulator to analyze the performance of
the Slotted Aloha protocol without interference. Tag detection is directly related to tag signal
strength detected by the reader. Radio Frequency signals behave differently when different
objects are present in the environment. For example water absorbs radio signals. When water is
present in the environment, tag detection will not be successful, since radio signals will be
absorbed by the water. Therefore, water is considered an interference factor in tag detection. This
thesis also proposed a mathematical model and a simulator to analyze the performance of the
Slotted Aloha protocol with interference. A comparison of both sets of results shows that the
proposed mathematical model and the simulator are accurate. Results of the analysis show that
the time required to identify tags with interference is longer than the time required to identify
tags without interference.Thesis (M.S.)--Wichita State University, College of Engineering, Dept. of Electrical Engineering and Computer Science.
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Qin, Yang. "Performance of network coded systems supported by automatic repeat request." Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/336231/.
Повний текст джерелаАнотація:
Inspired by the network information theory, network coding was invented in 2000. Since then, the theory and application of network coding have received intensive research and various network coding schemes have been proposed and studied. It has been demonstrated that the packetlevel network coding has the potential to outperform the traditional routing strategies in packet networks. By taking the advantages of the information carried by the packets sent to different receivers (sinks) in a packet network, packet-level network coding is capable of reducing the number of packets transmitted over the network. Therefore, the packet-level network coding employs the potential for boosting the throughput of packet networks. By contrast, the symbollevel network coding, which is also referred to as the physical-layer network coding, is capable of exploiting interference instead of avoiding it for improving the channel capacity and/or enhancing the reliability of communications. In this thesis, our focus is on the packet-level network coding. Performance of communication systems with network coding has been widely investigated from different perspectives, mainly under the assumption that packets are reliably transmitted over networks without errors. However, in practical communication networks, transmission errors always occur and error-detection or error-correction techniques are required in order to ensure reliable communications. Therefore, in this report, we focus our attention mainly on studying the performance of the communication networks with packet-level network coding, where Automatic Retransmission reQuest (ARQ) schemes are employed for error protection. Three typical ARQ schemes are invoked in our research, which are the Stop-and-Wait ARQ (SW-ARQ), Go-Back-N ARQ (GBN-ARQ) and the Selective-Repeat ARQ (SR-ARQ). Our main concern is the impact of network coding on the throughput performance of network coding nodes or networks containing network coding nodes. Additionally, the impact of network coding on the delay performance of network coding nodes or coded networks is also addressed. In a little more detail, in Chapter 3 of the thesis, we investigate the performance of the netvi works employing packet-level network coding, when assuming that transmission from one node to another is not ideal and that a certain ARQ scheme is employed for error-control. Specifically, the delay characteristics of general network coding node are first analyzed. Our studies show that, when a coding node invokes more incoming links, the average delay for successfully forming coded packets increases. Then, the delay performance of the Butterfly networks is investigated, which shows that the delay generated by a Butterfly network is dominated by the communication path containing the network coding node. Finally, the performance of the Butterfly network is investigated by simulation approaches, when the Butterfly network employs SW-ARQ, GBN-ARQ, or SR-ARQ for error-control. The achievable throughput, the average delay as well as the standard deviation of the delay are considered. Our performance results show that, when given a packet error rate Packet Error Rate (PER), the SR-ARQ scheme is capable of attaining the highest throughput and resulting in the lowest delay among these three ARQ schemes. In Chapter 4, the steady-state throughput of general network coding nodes is investigated, when the SW-ARQ scheme is employed. We start with considering a Two-Input-Single-Output (2ISO) network coding node without queueing buffers. Expressions for computing the steady-state throughput is derived. Then, we extend our analysis to the general H-Input-Single-Output (HISO) network coding nodes without queueing buffers. Finally, our analytical approaches are further extended to the HISO network coding nodes with queueing buffers. A range of expressions for evaluating the steady-state throughput are obtained. The throughout performance of the HISO network coding nodes is investigated by both analytical and simulation approaches. Our studies in this chapter show that the throughput of a network coding node decreases, as the number of its incoming links increases. This property implies that, in a network coding system, the coding nodes may form the bottlenecks for information delivery. Furthermore, the studies show that adding buffers to the network coding node may improve the throughput performance of a network coding system. Then, in Chapters 5 and 6, we investigate the steady-state throughput performance of the general network coding nodes, when the GBN-ARQ in Chapter 5 or the SR-ARQ in Chapter 6 is employed. Again, analytical approaches for evaluating the steady-state throughput of the general network coding nodes are concerned and a range of analytical results are obtained. Furthermore, the throughput performance of the network coding nodes supported by the GBN-ARQ or SR-ARQ is investigated by both simulations and numerical approaches. Finally, in Chapter 7, the conclusions extracted from the research are summarized and the possible directions for future research are proposed.
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Hu, Yichuan. "Analog non-linear coding for improved performance in compressed sensing." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 76 p, 2009. http://proquest.umi.com/pqdweb?did=1885755731&sid=5&Fmt=2&clientId=8331&RQT=309&VName=PQD.
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Nasieva, Irina O. "Analysis and optimisation of the performance of nonlinear optical communication systems." Thesis, Aston University, 2006. http://publications.aston.ac.uk/8242/.
Повний текст джерелаАнотація:
We investigate the feasibility of simultaneous suppressing of the amplification noise and nonlinearity, representing the most fundamental limiting factors in modern optical communication. To accomplish this task we developed a general design optimisation technique, based on concepts of noise and nonlinearity management. We demonstrate the immense efficiency of the novel approach by applying it to a design optimisation of transmission lines with periodic dispersion compensation using Raman and hybrid Raman-EDFA amplification. Moreover, we showed, using nonlinearity management considerations, that the optimal performance in high bit-rate dispersion managed fibre systems with hybrid amplification is achieved for a certain amplifier spacing – which is different from commonly known optimal noise performance corresponding to fully distributed amplification. Required for an accurate estimation of the bit error rate, the complete knowledge of signal statistics is crucial for modern transmission links with strong inherent nonlinearity. Therefore, we implemented the advanced multicanonical Monte Carlo (MMC) method, acknowledged for its efficiency in estimating distribution tails. We have accurately computed acknowledged for its efficiency in estimating distribution tails. We have accurately computed marginal probability density functions for soliton parameters, by numerical modelling of Fokker-Plank equation applying the MMC simulation technique. Moreover, applying a powerful MMC method we have studied the BER penalty caused by deviations from the optimal decision level in systems employing in-line 2R optical regeneration. We have demonstrated that in such systems the analytical linear approximation that makes a better fit in the central part of the regenerator nonlinear transfer function produces more accurate approximation of the BER and BER penalty. We present a statistical analysis of RZ-DPSK optical signal at direct detection receiver with Mach-Zehnder interferometer demodulation
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Cheng, Siu Pang Philip Carleton University Dissertation Computer Science. "Performance evaluation of a heirarchical task queue organization for multiprocessor systems." Ottawa, 1992.
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Rodriguez, Wilfredo. "Identifying mechanisms (naming) in distributed systems : goals, implications and overall influence on performance /." Online version of thesis, 1985. http://hdl.handle.net/1850/8820.
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Zhang, Zhihui. "Design and implementation of high performance filing systems." Diss., Online access via UMI:, 2005. http://wwwlib.umi.com/cr/binghamton/main/.
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Manganas, T. "Design of high-performance tracking systems for multivariable plants with explicit actuator and sensor dynamics." Thesis, University of Salford, 1987. http://usir.salford.ac.uk/26795/.
Повний текст джерелаАнотація:
The problems created by the presence of finite actuators and sensors in the control of linear multivariable systems are well known. These problems, which are particularly evident when high-gain or fast-sampling control is used, are usually the cause of highly oscillatory or even unstable closed-loop time-domain behaviour. Therefore, the presence of finite actuators and sensors is probably one of the major factors responsible for the failure of many of the existing multivariable. control methods to deal with practical control problems, .especially in the case of 'high-performance 1 systems - that require tight non-interacting closed-loop tracking behaviour. In this thesis, the very important field of high-gain and fast-sampling control of linear multivariable systems with explicit actuators and sensors is investigated. In particular, the synthesis of both high-gain analogue and fast-sampling digital error-actuated proportional-plus-integral controllers for linear minimum-phase multivariable plants with explicit actuator and sensor dynamics is presented. More importantly. the tuning of such controllers is systematised to make explicit the choice of the controller tuning parameters based on the gain/sampling frequency, the actuator and/or sensor time-constants, and the required closed-loop time-domain performance of the tracking systems. Furthermore, it is shown that the controller design can be achieved using only data obtained from direct input-output measurements in the time-domain. In this way, the limitations imposed by the requirement for the provision of linearised models in either state-space or transfer function matrix form - a prerequisite of many current design methodologies - for the purposes of controller design are eliminated and, as a result, the scope of practical applicability of the developed design methodology is vastly increased. The various novel facets of this design methodology are illustrated throughout this thesis by considering the multivariable model of a gas turbine with explicit actuator and sensor dynamics. Thus, the performance characteristics of the controllers for this gas turbine designed by the -present methodology are compared with those of controllers designed by previous methodologies.
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Madakasira, Sreenivas. "Performance analysis of an adaptive algorithm for sensor activation in renewable energy based sensor systems." Thesis, Wichita State University, 2010. http://hdl.handle.net/10057/3698.
Повний текст джерелаАнотація:
Linear increase-decrease algorithms have applicability in various fields of research. For instance,
transmission control protocol (TCP) congestion control mechanism employs an additive
increase and multiplicative decrease (AIMD) algorithm to vary the congestion window size dynamically
at the sender. Recently, an adaptive algorithm for sensor activation in renewable energy
based systems was proposed. This activation algorithm is designed in such a way that the sensor
dynamically computes its sleep interval according to additive increase and multiplicative decrease,
based on its current energy level. The objective is to maximize the asymptotic event detection
probability achieved in the system in the presence of uncertainties and energy constraints. This
thesis provides a simple, but accurate model to compute the performance of the algorithm for a
single sensor scenario. By means of the proposed model, the performance of the algorithm is
evaluated and is validated with that of the results obtained from simulations. A Markov Chain is
used to analyze the system for a single sensor scenario. Furthermore, the AIMD based algorithm
is extended towards a distributed implementation in a network with multiple sensors and multiple
event processes. Through extensive simulations, it is shown that the proposed algorithm performs
better than other algorithms in this scenario. In addition, the proposed algorithm is completely
localized, which makes it extremely suitable for distributed deployment.Thesis (M.S.)--Wichita State University, College of Engineering, Dept. of Electrical Engineering and Computer Science Engineering.
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Corbin, Robert Christopher. "Experimental evaluation of the seismic performance of hospital copper piping systems /." abstract and full text PDF (free order & download UNR users only), 2006. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1440930.
Повний текст джерелаАнотація:
Thesis (M.S.)--University of Nevada, Reno, 2006."December, 2006." Includes bibliographical references (leaves 77-82). Online version available on the World Wide Web. Library also has microfilm. Ann Arbor, Mich. : ProQuest Information and Learning Company, [2006]. 1 microfilm reel ; 35 mm.
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Teran, Maria. "An analysis for evaluating the cost/profit effectiveness of parallel systems." Master's thesis, Mississippi State : Mississippi State University, 2002. http://library.msstate.edu/etd/show.asp?etd=etd-10282002-201316.
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Fredholm, Susan (Susan A. ). "Evaluating electronic waste recycling systems : the influence of physical architecture on system performance." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/52750.
Повний текст джерелаАнотація:
Thesis (S.M. in Technology and Policy)--Massachusetts Institute of Technology, Engineering Systems Division, Technology and Policy Program, 2008.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (p. 63-68).
Many different forms of electronic waste recycling systems now exist worldwide, and the amount of related legislation continues to increase. Numerous approaches have been proposed including landfill bans, extended producer responsibility (EPR) and advance recovery fee (ARF) funded recycling systems. In order for policymakers and system architects to establish the optimal recycling system for their location, they need to know how to evaluate the performance of existing systems, and furthermore, how to use this information to design new systems. This thesis addresses the question: How does the physical system architecture of e-waste systems influence system performance? Specifically, it focuses upon the physical system architecture of collection site density and distribution. This thesis presents a systematic methodology developed with the Materials Systems Laboratory for characterizing recycling systems. Case studies of existing e-waste systems operating in Switzerland, Sweden, the Netherlands, Norway, Belgium, the Canadian province of Alberta and the US States of California, Maine and Maryland are examined for correlations between the environmental and financial performance of existing systems with respect to both the context and the architectural options of those systems. The case study analysis furthermore informs the construction of a model of e-waste systems. This model, which examines architectural choices in collection, transport, processing and system management of e-waste, is used to predict the environmental and financial performance of theoretical e-waste systems for a given location. The model was intentionally developed to be both broad, in order to encompass all pieces of recycling systems, and general, such that many different types of systems, both real and hypothetical, can be analyzed. Following an application of the model to several different combinations of system architecture and context, policy recommendations are made regarding the construction and evaluation of e-waste systems in various locations.
by Susan Fredholm.
S.M.in Technology and Policy
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Ibrahim, Ibrahim Ismail. "Design and performance of multiple access, spread spectrum systems for telemetry applications." Thesis, Queen's University Belfast, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329617.
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Rose, Richard C. "The design and performance of an analysis-by-synthesis class of predictive speech coders." Diss., Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/16693.
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Almoosa, Nawaf I. "Sensitivity analysis for online management of processor power and performance." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/51805.
Повний текст джерелаАнотація:
The shift to manycore architectures has highlighted the need for runtime power and performance management schemes to improve the reliability, performance, and energy-efficiency of processors. However, the design of management algorithms is challenging since power and performance are strongly dependent on the workload, which cannot be determined apriori and exhibit wide and rapid runtime variations.
This dissertation seeks to show that sensitivity analysis (derivative estimation) provides runtime power and performance information that enables the design of adaptive and low-complexity management algorithms. The contributions of the dissertation include: 1) controllers that achieve rapid regulation of the power and throughput of processor cores, 2) a chip-level power control solution that maximizes the performance of manycore processors subject to the power constraints set by the cooling system, and 3) an iterative algorithm for optimizing the energy consumption of cache memories. The proposed algorithms use runtime derivative estimation to adapt to the rapid power and performance variations caused by workload, and their efficacy is demonstrated via formal analysis and simulation experiments.
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Pati, Nishikanta. "Occlusion Tolerant Object Recognition Methods for Video Surveillance and Tracking of Moving Civilian Vehicles." Thesis, University of North Texas, 2007. https://digital.library.unt.edu/ark:/67531/metadc5133/.
Повний текст джерелаАнотація:
Recently, there is a great interest in moving object tracking in the fields of security and surveillance. Object recognition under partial occlusion is the core of any object tracking system. This thesis presents an automatic and real-time color object-recognition system which is not only robust but also occlusion tolerant. The intended use of the system is to recognize and track external vehicles entered inside a secured area like a school campus or any army base. Statistical morphological skeleton is used to represent the visible shape of the vehicle. Simple curve matching and different feature based matching techniques are used to recognize the segmented vehicle. Features of the vehicle are extracted upon entering the secured area. The vehicle is recognized from either a digital video frame or a static digital image when needed. The recognition engine will help the design of a high performance tracking system meant for remote video surveillance.
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Sturdy, James Luckett. "Analysis of the altitude tracking performance of aircraft-autopilot systems in the presence of atmospheric disturbances." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/35936.
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Smarra, Devin. "Thermal Management and Packaging Techniques for High Performance Electrical Systems." University of Dayton / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1591122977788952.
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Shultes, Bruce Chase. "Regenerative techniques for estimating performance measures of highly dependable systems with repairs." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/25035.
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