International Telemetering Conference Proceedings / October 26-29, 1992 / Town and Country Hotel and Convention Center, San Diego, California / A computational system was developed to support data collection for advanced airborne technology research. Basic research is conducted using a variety of sensing devices for collection of flight characteristics data from aircraft. To maximize control over as many variables as possible during research activities, a controlled aircraft tracking environment is needed to provide reference data for real-time operation and post-mission analysis. The solution to this requirement is realized with the ACMI Interface System (ACINTS). The ACINTS extracts real-time tracking data from a closed-loop telemetered tracking array, reprocesses needed parameters, provides reference data (positioning and control commands) to the sensor device, and records aircraft kinematics for later correlation with other collected data.

Ingeniero Civil Industrial / El proyecto AKORI está pensado como una plataforma informática basada en técnicas de Web Intelligence, y análisis de la exploración visual para mejorar la estructura y los contenidos de un sitio web. En su etapa de investigación, se han incorporado estudios relacionados con la dilatación pupilar, el posicionamiento ocular y análisis de la actividad cerebral de los usuarios web. Una de las líneas de investigación indagó en la relación entre la dilatación pupilar y la toma de decisión de los usuarios de sitios web. Para profundizar en este estudio, se pretende realizar una investigación exploratoria, relacionando la toma de decisión con un nuevo marcador fisiológico. El objetivo general es determinar si existe una relación entre el potencial eléctrico producido por la actividad cerebral y la toma de decisión de un usuario en un sitio web. La hipótesis de investigación se plantea de la siguiente manera: El potencial bioeléctrico producido por la actividad cerebral puede predecir la toma de decisión de un usuario web . La metodología de esta investigación considera cuatro etapas: Análisis del estado del arte en el área de la neurociencia y técnicas de Data Mining; Diseño e implementación de experimentos; Análisis y procesamiento de los datos para validar la hipótesis de investigación y la construcción del clasificador; y finalmente comparar los resultados de la metodología obtenidas anteriormente. Para obtener los datos, se utilizaron herramientas de Eye-Tracking y EEG, en experimentos que simulan una situación discriminatoria dentro de un sitio web, mostrando imágenes de valencia neutra y donde el usuario debía escoger una de ellas. Para poder realizar extrapolación, se experimentó con 20 sujetos, de los cuales 18 finalizaron con la totalidad de los registros. Para analizar los datos, se separaron las observaciones que coinciden con el objeto elegido y las que no. Aquellas que tenía más de 600ms. de duración, fueron promediadas y graficadas. Al graficar cada una de las curvas, no se observan diferencias significativas. Sin embargo, se observa un patrón de comportamiento común, que consiste en la disminución de la actividad cerebral en los primeros 100ms. y un alza abrupta en la actividad durante los siguientes 200ms. Dado que no hay diferencias significativas, se realizaron dos tipos de caracterizaciones descripción estadística y transformada de Wavelet, que finalmente no permitieron validar la hipótesis de este trabajo. Si bien, la hipótesis de investigación no fue validada con los parámetros descritos, se reconoce que existen variables fisiológicas que constituyen una fuente de información que puede ser aplicadas en diversos ámbitos, ya sea en web-intelligence, web-mining, u otra disciplina ajena a la medicina pura.

This report concerns a detection module used for a pellet tracking system. Spheres of frozen hydrogen known as pellets can be used as internal targets in hadron physics experiments. Pellets are created some distance above the accelerator beam and directed in a pellet beam pipe to intersect the accelerator beam. To determine the position of a pellet in the interaction region in the case of an interaction, the pellets need to be tracked. This is done using tracking sections along the pellet beam pipe with measurement levels containing lasers illuminating the pellets and cameras, detecting the light. The pellet position in the interaction region can be reconstructed with an accuracy of 0.1 mm. To reach this accuracy there are high demands on the alignment of the cameras and lasers. Alignment by a pellet beam pipe is generally difficult so a solution enabling alignment elsewhere is desired. Therefore a detection module consisting of a plate with cameras and lasers mounted to it has been constructed. These cameras and lasers can be aligned in an alignment bench setup before being transported to a pellet beam pipe. The alignment of the cameras and lasers on the detection module must be maintained under certain conditions e.g. transportation, temperature changes, exposure to vibrations. This report covers investigations regarding the mechanical stability of the detection module under these conditions. Different alignment bench targets are investigated. The effects of the optics of the cameras and lasers and the functionality of the detection module are investigated.

The Air Force Weather Agency (AFWA) version of the Advanced Research Weather Research and Forecasting (ARW) model with a moving 4-km nested grid is examined for 10 track and intensity predictions of six western North Pacific tropical cyclones during 2005. In three of the 10 integrations, the ARW vortex tracker algorithm based on the 500-mb height minimum failed to appropriately move the nest and thus lost track of the storm vortex. For the other seven cases, the ARW track forecasts are more skillful than the AFWA MM5 forecasts and (except at 12 h) the CLIPER-type forecasts. The ARW intensity forecasts were less skillful than the MM5 and CLIPER-type forecasts at all forecast intervals, and were severely degraded by a large negative bias at the initial time. The deficiency in these intensity forecasts is shown to be related to model spin-up (lasting 12-54 h) problems caused by the lack of a bogus vortex and a cold start initialization from the interpolation of the NCEP Global Forecast System (GFS) analysis to the 12- km and 4-km grids. Thus, a more appropriate initial vortex representation will be required to improve intensity forecasts.

Today in most vehicles in battle, a camera system is used to manually lock a target and maintaining visual of the target as the vehicle is moving. In order to simplify this, this thesis investigates the approach to semi-automate the process by first manually locking the target and then let the camera approximate the trajectory of the enemy vehicle. In this thesis, the enemy vehicle is not moving. The ability to provide a truthful simulation environment for testing is crucial and will be discussed in this thesis along with three different estimators derived from the Kalman filter. Parameter identification and dynamic modelling of the camera are also presented that serves as a basis for the part of automatic control and for the experiments on the hardware. The simulation environment gave promising results when locating the target based on angle and radius estimation. By simulating a human operator, big deviations from the true value was no longer a problem since its purpose is to take over and steer the camera to the correct value. After gathering results from the simulations, Model-Based Design made it possible to test the algorithms in real life. The biggest challenge was to produce lifelike motions to test the hardware on and therefore made it harder to conclude the end result for the experiments carried out by the hardware on the moving platform.

No description available.

We study experimentally the gravity-driven bubbly flow inside a large Hele-Shaw cell. The bubbles and foam were created by a series of upside-down overturns of the half-filled cell about its horizontal axis. When the liquid flows down it entraps a large number of bubbles, which remain stable as the liquid contains surfactant molecules. The total number and sizes of these bubbles slowly asymptote to a steady state after dozens of overturns. It takes longer to reach this asymptote when the viscosity of the liquid is larger. The bubbles also become more monodisperse with more cell over-turns. The number and distribution of the bubbles in turn affects the average motion of the liquid phase, which is characterized by the downwards motion of the liquid center of mass. We use high-resolution 6k video-camera to track the trajectories of thousands of bubbles. This required the development of software codes to identify individual bubbles and follow them between video frames. Successful thresholding algorithm required a machine-learning component, which was integrated into the program. This program also needed to account for possible splitting or coalescence of adjacent bubbles. The program can also find the velocities along the trajectories. In this way we can find the vertical velocity of bubbles as a function of their sizes. The smaller bubbles are sometimes observed to move downwards against their buoyancy. This occurs when the viscous stress from the surrounding liquid phase overcomes the upwards buoyancy force. Bubbles with similar sizes were often found to be stacking together and having worm-like rising movement that is faster than their individual rising velocity. The occurrence of the bubble stacking was dependent on the distance between the bubbles, their sizes and their wakes. Clusters of tiny bubbles that are much smaller than the gap of the Hele-Shaw cell were observed to form layers which can severely hinder the overall liquid motion.

Tesis para optar al grado de Magister en Educación con mención en Informática Educativa / El objetivo del presente proyecto de tesis es identificar las características de la huella digital que son más determinantes en la eficiencia del recorrido web de estudiantes de un diplomado universitario en una tarea asignada en la plataforma Moodle. El tipo de investigación será de carácter cuantitativa con algunos elementos cualitativos y los instrumentos para la recolección de datos serán un test de figuras enmascaradas GEFT el cual consiste en la búsqueda de figuras simples dentro de otras complejas con el fin de categorizar a los individuos en el estilo cognitivo Dependencia/independencia de campo. Con estos elementos y en el marco de la teoría de la actividad, la que señala que los individuos no pueden ser entendidos sin el medio cultural en que viven, y la sociedad, sin la agencia de personas que utilizan artefactos, se realiza un estudio de las huellas que van dejando los individuos que participan del curso, donde estas huellas tienen características que podrían determinar el grado de eficiencia que poseen al completar una tarea asignada en el curso que se dicta a través de la plataforma. Este análisis se ejecuta por medio de un análisis de trazas de actividad propuesto en la presente investigación, que entrega datos relevantes, contrastando a los individuos en su estilo cognitivo con el grado de eficiencia obtenido en la resolución de la tarea, donde finalmente se propone un modelo de análisis de huellas y su representación. La evidencia respecto de la hipótesis indica que los Individuos dependientes de campo no son los mas eficientes y las características que son mas determinantes son: recuperación, precisión y economía

O sol é a fonte de energia mais importante para todos os seres vivos no planeta Terra. Os sistemas concentrados de energia solar e fotovoltaica apresentaram avanços importantes na eficiência da conversão da irradiação solar em energia elétrica. A redução dos custos do equipamento necessário, combinada com um maior acesso ao conhecimento com a popularização da internet, permitiu que esta tecnologia se encontrasse em vários setores da sociedade. Neste estudo, analisou-se a eficiência energética de um painel solar com sistema de rastreamento de controle em circuito fechado baseado em fotoresistores. Este painel solar foi projetado e montado com tecnologia DIY em comparação com um painel de ângulo fixo. O sistema foi analisado em três condições atmosféricas diferentes: sol, parcialmente nublado e totalmente nublado. Os dados de corrente elétrica produzidos pelos dois sistemas e a carga consumida pelo painel do rastreador foram gravados automaticamente usando um sistema de coleta de dados para cada painel fotovoltaico. O sistema com rastreador mostrou uma produção de energia de 24,52% maior do que o painel fixo no período de maior radiação solar. Observou-se que a produção de energia do painel com sistema de rastreamento é maior durante períodos de ângulo de elevação inferior em relação ao horizonte. No entanto, a análise de eficiência energética do sistema de rastreamento apresentou uma comparação de geração de energia elétrica negativa em relação ao painel de ângulo fixo, e o painel com rastreador apresentou um custo elevado de 216,60% em relação ao painel em ângulo fixo. Portanto, não compensa o uso da tecnologia DIY nas condições testadas. / The sun is the most important source of energy for all living beings on planet Earth. Concentrated solar and photovoltaic systems have presented important advances in the efficiency of the conversion of solar irradiation to electric energy. The reduction in the costs of the necessary equipment, combined with greater access to knowledge with the popularization of the internet, has allowed this technology to be present in several sectors of society. In this study the energy efficiency of a solar panel with closed loop control tracker system based on photoresistors was analyzed. This solar panel was designed and assembled with DIY technology compared to a fixed-angle panel. The system was analyzed in three different atmospheric conditions: sunny, partly cloudy and totally cloudy. The electrical current data produced by the two systems and the load consumed by the tracker panel were automatically recorded using a data collection system for each photovoltaic panel. The system with tracker showed energy production of 24.52% higher than the fixed panel in the period of higher solar radiation. It was observed that the energy production of the panel with tracker system is higher during periods of lower elevation angle with respect to the horizon. However, the energy efficiency analysis of the tracking system presented a compared to of negative electric power generation in relation to the fixed-angle panel, and the panel with tracker presented a high cost of 216,60% in relation to the panel in fixed form. Therefore, it does not compensate for the use of DIY technology in the tested conditions.

This thesis explores the automatic extraction of musical information from live performances - with the intention of using that information to create novel, responsive and adaptive performance tools for musicians. We focus specifically on two forms of musical analysis - harmonic analysis and beat tracking. We present two harmonic analysis algorithms - specifically we present a novel chroma vector analysis technique which we later use as the input for a chord recognition algorithm. We also present a real-time beat tracker, based upon an extension of state of the art non-causal models, that is computationally efficient and capable of strong performance compared to other models. Furthermore, through a modular study of several beat tracking algorithms we attempt to establish methods to improve beat tracking and apply these lessons to our model. Building upon this work, we show that these analyses can be combined to create a beat-synchronous musical representation, with harmonic information segmented at the level of the beat. We present a number of ways of calculating these representations and discuss their relative merits. We proceed by introducing a technique, which we call Performance Following, for recognising repeated patterns in live musical performances. Through examining the real-time beat-synchronous musical representation, this technique makes predictions of future harmonic content in musical performances with no prior knowledge in the form of a score. Finally, we present a number of potential applications for live performances that incorporate the real-time musical analysis techniques outlined previously. The applications presented include audio effects informed by beat tracking, a technique for synchronising video to a live performance, the use of harmonic information to control visual displays and an automatic accompaniment system based upon our performance following technique.