The manuscript of the medieval morality play The Castle of Perseverance contains an illustration commonly understood as the earliest example of a medieval stage plan. Yet The Castle is an allegory, an extended metaphor, the meaning of which comes from the exegetical tradition. Medieval drama is didactic, and education, like exegesis and metaphor, operates on many levels. The Castle plays on the meaning of play: to read it solely as a play is to read merely the first level of meaning. This thesis considers The Castle not in its usual dramatic context but in that of devotional literature: specifically, exegesis, mysticism, and the monastic practice of lectio divina, divine reading. It focuses on the text and diagram as the verbal and visual illustration of classical and biblical metaphors: among these, the pilgrimage of life, the castle of the mind, the treasure chest of the heart, and the river of the soul. Gregory the Greats Moralia in Job is discussed as the likeliest source of the metaphors found in The Castle; the Moralia serves as an exemplar of allegory as a systematic metaphor and a metaphoric system. The Castle allegorizes and actualizes an abstraction, the process of temptation; depicting the mind as a stage on which players become prayers. Morality plays concern the ethics of salvation: one is the sum of ones choices. Thus, the manuscripts goal is to foster contemplation or Christian Socratism, the examination of conscience, as a prerequisite to salvation and the mystical union with God.

Quality of Service (QoS) is the ability to guarantee that data sent across a network will be recieved by the desination within some constraints. For many advanced applications, such as real-time multimedia QoS is determined by four parameters--end-to-end delay, delay jitter, available bandwidth or throughput, and packet drop or loss rate. It is interesting to study and be able to predict the behavior of end-to-end packet delays in a Wide area network (WAN) because it directly a??ects the QoS of real-time distributed applications. In the current work a time-series representation of end-to-end packet delay dynamics transported over standard IP networks has been considered. As it is of interest to model the open loop delay dynamics of an IP WAN, the UDP is used for transport purposes. This research aims at developing models for single-step-ahead and multi-step-ahead prediction of moving average, one-way end-to-end delays in standard IP WAN??s. The data used in this research has been obtained from simulations performed using the widely used simulator ns-2. Simulation conditions have been tuned to enable some matching of the end-to-end delay profiles with real traffic data. This has been accomplished through the use of delay autocorrelation profiles. The linear system identification models Auto-Regressive eXogenous (AR) and Auto-Regressive Moving Average with eXtra / eXternal (ARMA) and non-linear models like the Feedforwad Multi-layer Perceptron (FMLP) have been found to perform accurate single-step-ahead predictions under varying conditions of cross-traffic flow and source send rates. However as expected, as the multi-step-ahead prediction horizon is increased, the models do not perform as accurately as the single-step-ahead prediction models. Acceptable multi-step-ahead predictions for up to 500 msec horizon have been obtained.

System identification has importance in modeling and control of industrial systems. The main task of system identification is to build a suitable model that represents the relationship between input, output and disturbances of a real system. The thesis presents identification and discrete time linear modeling of a hydraulic actuator. This thesis demonstrates how to formulate hydraulic functions for both normal and faulty conditions with internal leakage using both offline and on-line measurements. Least square and recursive least square methods are used to estimate the model parameters based on the Auto Regressive technique with Exogenous input (ARX) model. For the offline case, square and sine wave signals are used as input control signals. For the online case, random input control signal is applied. Prediction error criterion is used for model validation based on experimental data. It is shown that the ARX model is capable of representing a valve-controlled hydraulic system dynamics.

System identification has importance in modeling and control of industrial systems. The main task of system identification is to build a suitable model that represents the relationship between input, output and disturbances of a real system. The thesis presents identification and discrete time linear modeling of a hydraulic actuator. This thesis demonstrates how to formulate hydraulic functions for both normal and faulty conditions with internal leakage using both offline and on-line measurements. Least square and recursive least square methods are used to estimate the model parameters based on the Auto Regressive technique with Exogenous input (ARX) model. For the offline case, square and sine wave signals are used as input control signals. For the online case, random input control signal is applied. Prediction error criterion is used for model validation based on experimental data. It is shown that the ARX model is capable of representing a valve-controlled hydraulic system dynamics.

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The continued expansion of the Internet of Things (IoT) in recent years has introduced a myriad of concerns about its security. There have been numerous examples of IoT devices being attacked, demonstrating the need for integrated security. The vulnerability of data transfers in the IoT can be addressed using cryptographic protocols. However, IoT devices are resource-constrained which makes it difficult for them to support existing standards. To address the need for new, standardized lightweight cryptographic algorithms, the National Institute of Standards and Technology (NIST) began a Lightweight Cryptography Standardization Process. This work analyzes the Sparkle (Schwaemm and Esch) submission to the process from a hardware based perspective. Two baseline implementations are created, along with one implementation designed to be resistant to side channel analysis and an incremental implementation included for analysis purposes. The implementations use the Hardware API for Lightweight Cryptography to facilitate an impartial evaluation. The results indicate that the side channel resistant implementation resists leaking data while consuming approximately three times the area of the unprotected, incremental implementation and experiencing a 27% decrease in throughput. This work examines how all of these implementations perform, and additionally provides analysis of how they compare to other works of a similar nature. / Master of Science / In today's society, interactions with connected, data-sharing devices have become common. For example, devices like "smart" watches, remote access home security systems, and even connected vending machines have been adopted into many people's day to day routines. The Internet of Things (IoT) is the term used to describe networks of these interconnected devices. As the number of these connected devices continues to grow, there is an increased focus on the security of the IoT. Depending on the type of IoT application, a variety of different types of data can be transmitted. One way in which these data transfers can be protected is through the use of cryptographic protocols. The use of cryptography can provide assurances during data transfers. For example, it can prevent an attacker from reading the contents of a sensitive message. There are several well studied cryptographic protocols in use today. However, many of these protocols were intended for use in more traditional computing platforms. IoT devices are typically much smaller in size than traditional computing platforms. This makes it difficult for them to support these well studied protocols. Therefore, there have been efforts to investigate and standardize new lightweight cryptographic protocols which are well suited for smaller IoT devices. This work analyzes several hardware implementations of an algorithm which was proposed as a submission to the National Institute of Standards and Technology (NIST) Lightweight Cryptography Standardization Process. The analysis focuses on metrics which can be used to evaluate its suitability for IoT devices.

Airbus réalise pour chaque avion et pour chaque équipement de nombreux essais, au sol ou en vol et doit garantir qu'en tout point de vol possible, la température de chacun des équipements reste inférieure à la température limite correspondante. Pour pouvoir valider la température de chaque équipement dans l'enveloppe de vol, il faudrait disposer d'essais réalisés aux frontières. Or, tous les essais en vol sont confrontés aux contraintes climatiques et opérationnelles qui ne permettent pas d'explorer tout le domaine. C'est pourquoi Airbus a besoin d'élaborer des méthodes d'extrapolation de température, de manière à prédire le comportement thermique des matériaux et des équipements dans les pires conditions. Les techniques proposées sont basées sur la théorie de l'identification de systèmes qui consiste à déterminer des modèles de comportement d'un point de vue heuristique à partir de mesures et considérations physiques. Plus précisément, le présent document valide les modèles ARX comme un outil pour l'identification de la température du système. Les modèles et les techniques sont étudiés, tout d'abord, d'un point de vue de la simulation numérique et après, confrontés face à des tests représentatifs au laboratoire. Les techniques proposées permettent prédire la température des composants avion pour des conditions différentes / Airbus must ensure that for all flight conditions that a given aircraft could face, the temperature of each powerplant system must be less than the corresponding critical temperature. In order to validate the temperature of each device in the flight envelope, tests at the border should be done. Airbus produces for each aircraft component many trials, either in flight or ground. However, all flight tests are faced with climatic and operational constraints which do not permit exploring the whole area. That's why Airbus needs to develop methods of extrapolation of temperature in order to predict the thermal behavior of materials and equipments in the worst conditions. The proposed techniques are based on the system identification theory which consists on heuristically determining an analytical model using physical insights and measurements. More precisely, this paper validates ARX models as a tool for the identification of the system's temperature. The models and techniques are studied, first, from a numerical simulation point of view and second, based on laboratory representative tests. The proposed techniques allow predicting the temperature of aircraft components at different conditions

Made available in DSpace on 2014-12-17T14:55:00Z (GMT). No. of bitstreams: 1 SergioJGS.pdf: 1164807 bytes, checksum: 597fe8700a95271ecd0c0f3e0b460362 (MD5) Previous issue date: 2007-11-13 / This work intends to analyze the behavior of the gas flow of plunger lift wells producing to well testing separators in offshore production platforms to aim a technical procedure to estimate the gas flow during the slug production period. The motivation for this work appeared from the expectation of some wells equipped with plunger lift method by PETROBRAS in Ubarana sea field located at Rio Grande do Norte State coast where the produced fluids measurement is made in well testing separators at the platform. The oil artificial lift method called plunger lift is used when the available energy of the reservoir is not high enough to overcome all the necessary load losses to lift the oil from the bottom of the well to the surface continuously. This method consists, basically, in one free piston acting as a mechanical interface between the formation gas and the produced liquids, greatly increasing the well s lifting efficiency. A pneumatic control valve is mounted at the flow line to control the cycles. When this valve opens, the plunger starts to move from the bottom to the surface of the well lifting all the oil and gas that are above it until to reach the well test separator where the fluids are measured. The well test separator is used to measure all the volumes produced by the well during a certain period of time called production test. In most cases, the separators are designed to measure stabilized flow, in other words, reasonably constant flow by the use of level and pressure electronic controllers (PLC) and by assumption of a steady pressure inside the separator. With plunger lift wells the liquid and gas flow at the surface are cyclical and unstable what causes the appearance of slugs inside the separator, mainly in the gas phase, because introduce significant errors in the measurement system (e.g.: overrange error). The flow gas analysis proposed in this work is based on two mathematical models used together: i) a plunger lift well model proposed by Baruzzi [1] with later modifications made by Bolonhini [2] to built a plunger lift simulator; ii) a two-phase separator model (gas + liquid) based from a three-phase separator model (gas + oil + water) proposed by Nunes [3]. Based on the models above and with field data collected from the well test separator of PUB-02 platform (Ubarana sea field) it was possible to demonstrate that the output gas flow of the separator can be estimate, with a reasonable precision, from the control signal of the Pressure Control Valve (PCV). Several models of the System Identification Toolbox from MATLAB? were analyzed to evaluate which one better fit to the data collected from the field. For validation of the models, it was used the AIC criterion, as well as a variant of the cross validation criterion. The ARX model performance was the best one to fit to the data and, this way, we decided to evaluate a recursive algorithm (RARX) also with real time data. The results were quite promising that indicating the viability to estimate the output gas flow rate from a plunger lift well producing to a well test separator, with the built-in information of the control signal to the PCV / Este trabalho se prop?e a realizar uma an?lise do comportamento da vaz?o de g?s de po?os produzindo por plunger lift para vasos separadores de teste em plataformas de produ??o de petr?leo com o objetivo de propor uma t?cnica de estima??o da vaz?o durante os instantes de golfadas provocadas por estes tipos de po?os. A motiva??o para este trabalho surgiu diante da perspectiva de instala??o pela PETROBRAS de alguns po?os equipados com plunger lift no campo mar?timo de Ubarana situado na costa do Rio Grande do Norte onde a medi??o dos volumes produzidos ? feita em vaso separador na plataforma. O m?todo de eleva??o artificial de petr?leo denominado plunger lift ? utilizado quando a energia dispon?vel no reservat?rio n?o ? suficiente para vencer todas as perdas de carga necess?rias para elevar o petr?leo do fundo do po?o at? a superf?cie de forma cont?nua. O m?todo consiste, basicamente, de um pist?o livre (plunger) agindo como uma interface mec?nica entre o g?s da forma??o e os l?quidos produzidos, aumentando enormemente a efici?ncia de eleva??o. ? instalada, tamb?m, uma v?lvula de controle acionada pneumaticamente, na linha de produ??o do po?o para efetuar o controle dos ciclos. Ao ser aberta a v?lvula, o pist?o se desloca do fundo do po?o at? a superf?cie, elevando o ?leo e o g?s que se encontram acima do mesmo at? chegar no vaso separador de teste onde os fluidos ser?o medidos. O vaso separador de teste ? utilizado para fazer a aferi??o dos volumes produzidos pelo po?o durante um determinado per?odo de tempo denominado de teste de produ??o. Na maioria dos casos, os vasos separadores s?o projetados para medi??o de vaz?es estabilizadas, ou seja, razoavelmente constantes atrav?s do uso de controladores eletr?nicos de n?vel e de press?o. No caso de po?os produzindo por plunger lift, as vaz?es de l?quido e de g?s na superf?cie s?o c?clicas e de amplitude vari?vel, acarretando o surgimento de golfadas no interior do vaso separador provocando, principalmente para o caso do g?s, erros significativos no sistema de medi??o (ex.: erro de overrange ). A an?lise da vaz?o de g?s proposta neste trabalho se baseia na integra??o de dois modelos matem?ticos: i) modelagem de um po?o de plunger lift proposta por Baruzzi [1] com modifica??es efetuadas posteriormente por Bolonhini [2] na implementa??o de um simulador de plunger lift; ii) modelagem de um vaso separador bif?sico (g?s + l?quido) a partir de um modelo trif?sico (?leo + g?s + ?gua) proposto por Nunes [3]. Com base nos modelos acima e utilizando-se dados coletados no vaso separador de teste da plataforma PUB-02 (campo de Ubarana), foi poss?vel demonstrar que a vaz?o de sa?da de g?s do vaso de teste pode ser estimada, com razo?vel precis?o, a partir do sinal de controle da v?lvula controladora de press?o (PCV). Diversos modelos dispon?veis no toolbox de Identifica??o de Sistemas do MATLAB? foram analisados para se avaliar qual seria o que melhor se adaptava aos dados coletados no campo. Para a valida??o dos modelos foi usado o crit?rio de AIC, bem como uma variante do crit?rio de valida??o cruzada. O modelo ARX foi o que apresentou melhor desempenho com base nos dados coletados e, desta forma, decidiu-se avaliar tamb?m um algoritmo recursivo (RARX) com dados obtidos em tempo real. Os resultados foram bastante promissores, indicando a viabilidade de se poder estimar a vaz?o de sa?da de g?s de um po?o de plunger lift produzindo para um vaso separador de teste a partir da informa??o contida no sinal de controle da PCV

This master’s thesis describes the development of a model of the catalystsystem aiming at control by an MPC. A well functioning model, which is suitable in control purpose, is important while emission legislation become more and more hard to fulfill for the car manufacturers. Much research has been done in the field of physical modeling of the system, but in this work a linear adaptive time discrete ARX-model is developed and validated. The systems tendency to change its dynamic during usage implies that the model must be adaptive. The developed model proved to be well functioning and shows promising conditions for the MPC design. The system and the model are analyzed in the time- and frequency domains and the model is both implemented and validated in a Saab 9-5. The work has been performed both at Saab Automobile Powertrain AB in Södertälje and in Vehicular Systems Dept. of Electrical Engineering at Linköpings University.

<p>Feedback control of Chest Acceleration or Chest Deflection is believed to be a good way of minimizing the risk of injury. In order to implement such a controller in a car, an observer estimating these responses is needed. The objective of the study was to develop a model of the dummy’s chest capable of estimating the Chest Acceleration and the Chest Deflection during frontal crashes in real time. The used sensor data come from car accelerometer and spindle rotation sensor of the belt, the data has been collected from dummies during crash tests. This study has accomplished the aims using a simple linear model of the chest using masses, springs and dampers. The parameters of the model have been estimated through system identification. Two types of black-box models have also been studied, one ARX model and one state-space model. The models have been tested and validated against data coming from different crash setups. The results show that all of the studied models can be used to estimate the dummy responses, the physical grey-box model and the black-box state-space model in particular.</p> / <p>Genom att använda återkoppling av storheterna bröstacceleration och bröstintryck antas man kunna minska risken för skador vid krockar i personbilar. För att kunna implementera detta behövs en observatör för dessa storheter. Målet med denna studie är att ta fram en modell för att kunna skatta accelerationen i bröstkorgen samt bröstintrycket i realtid i frontala krockar. Sensordata som använts kom från en accelerometer och en givare för att mäta rotationen i bältessnurran. Detta har gjorts genom att modellera bröstkorgen med linjära fjädrar och dämpare. Dess parametrar har skattats från data från krocktester från krockdockor. Två s.k. black-box-modeller har också tagits fram, en ARX-modell och en på tillståndsform. Modellerna har testats och validerats mha data från olika sorters krocktester. Resultaten visar att alla studerade modeller kan användas för att skatta de ovan nämnda storheterna, den fysikaliska modellen och black-box-modellen på tillståndsform fungerade bäst.</p>