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Increasing penetration of stochastic photovoltaic (PV) generation into the electric power system poses significant challenges to system operators. In the thesis, we evaluate the spatial and temporal correlations of stochastic PV generation at multiple sites. Given the unique spatial and temporal correlation of PV generation, an optimal data-driven forecast model for short-term PV power is proposed. This model leverages both spatial and temporal correlations among neighboring solar sites, and is shown to have improved performance compared with conventional persistent model. The tradeoff between communication cost and improved forecast quality is studied using realistic data sets collected from California and Colorado. n IEEE 14 bus system test case is used to quantify the value of improved forecast quality through the reduction of system dispatch cost. The Modified spatio-temporal forecast model which has the least forecast PV overestimate percentage shows the best performance in the dispatch cost reduction.

Encontros com o outro: arte e gênero em uma experiência de troca de retratos é uma pesquisa em poéticas visuais que fala sobre a experiência do olhar no retrato e como ele se traduz ao lidar com homens e mulheres. Foram realizados encontros para a produção de trocas de retratos entre a autora e seus amigos, em que ela utilizou a fotografia e eles utilizaram técnicas variadas. A questão do gênero é trazida para falar sobre o poder de quem olha e sobre como mulheres e homens são vistos e representados em imagens. Também foram realizadas entrevistas com os artistas convidados, falando sobre a experiência do retrato, e sobre as diferenças entre retratar um homem e uma mulher. O “outro” presente no título pode ser lido como uma das pessoas presentes na relação entre retratado e retratante e, também como a mulher, um outro em relação ao homem. / Meetings with the other: art and gender in an experience of portrait exchange is a research in visual poetics that talks about the experience of looking in portrait and how it translates when dealing with men and women. Meetings were carried out for the production of portrait exchanges between the author and her friends, in which she used photography and they used different techniques. The issue of gender is brought in to talk about the power of who looks and how women and men are seen and represented in images. Interviews were also conducted with guest artists, talking about the experience of portrait, and about the differences between portraying a man and a woman. The "other" in this title can be read as one of the persons present in the relationship between the portrayed and the portrayer, and also as the woman, another in relation to man.

Encontros com o outro: arte e gênero em uma experiência de troca de retratos é uma pesquisa em poéticas visuais que fala sobre a experiência do olhar no retrato e como ele se traduz ao lidar com homens e mulheres. Foram realizados encontros para a produção de trocas de retratos entre a autora e seus amigos, em que ela utilizou a fotografia e eles utilizaram técnicas variadas. A questão do gênero é trazida para falar sobre o poder de quem olha e sobre como mulheres e homens são vistos e representados em imagens. Também foram realizadas entrevistas com os artistas convidados, falando sobre a experiência do retrato, e sobre as diferenças entre retratar um homem e uma mulher. O “outro” presente no título pode ser lido como uma das pessoas presentes na relação entre retratado e retratante e, também como a mulher, um outro em relação ao homem. / Meetings with the other: art and gender in an experience of portrait exchange is a research in visual poetics that talks about the experience of looking in portrait and how it translates when dealing with men and women. Meetings were carried out for the production of portrait exchanges between the author and her friends, in which she used photography and they used different techniques. The issue of gender is brought in to talk about the power of who looks and how women and men are seen and represented in images. Interviews were also conducted with guest artists, talking about the experience of portrait, and about the differences between portraying a man and a woman. The "other" in this title can be read as one of the persons present in the relationship between the portrayed and the portrayer, and also as the woman, another in relation to man.

Encontros com o outro: arte e gênero em uma experiência de troca de retratos é uma pesquisa em poéticas visuais que fala sobre a experiência do olhar no retrato e como ele se traduz ao lidar com homens e mulheres. Foram realizados encontros para a produção de trocas de retratos entre a autora e seus amigos, em que ela utilizou a fotografia e eles utilizaram técnicas variadas. A questão do gênero é trazida para falar sobre o poder de quem olha e sobre como mulheres e homens são vistos e representados em imagens. Também foram realizadas entrevistas com os artistas convidados, falando sobre a experiência do retrato, e sobre as diferenças entre retratar um homem e uma mulher. O “outro” presente no título pode ser lido como uma das pessoas presentes na relação entre retratado e retratante e, também como a mulher, um outro em relação ao homem. / Meetings with the other: art and gender in an experience of portrait exchange is a research in visual poetics that talks about the experience of looking in portrait and how it translates when dealing with men and women. Meetings were carried out for the production of portrait exchanges between the author and her friends, in which she used photography and they used different techniques. The issue of gender is brought in to talk about the power of who looks and how women and men are seen and represented in images. Interviews were also conducted with guest artists, talking about the experience of portrait, and about the differences between portraying a man and a woman. The "other" in this title can be read as one of the persons present in the relationship between the portrayed and the portrayer, and also as the woman, another in relation to man.

La clinique auprès d’adolescents amène le psychologue à s’interroger sur la place qu’occupent le regard et la voix au cours de cette traversée. Si ces deux objets sont au cœur de la naissance du sujet, leur nouage devient incertain au temps de l’adolescence. Les fugues ado- lescentes, que nous désignons par le terme « disparition » adviennent comme le témoignage d’un dénouage : celui du regard et de la voix. Ainsi, disparaître, c’est s’arracher au silence de l’Autre, un silence vociférant, structuré comme comme un mauvais œil. Il s’agit, alors, de créer un lieu, un espace — celui de la disparition — à partir duquel pourra se penser le retour. / The adolescent’s clinic brings the psychologist to question the place of the look and the voice during this passing through time. Even if these two items are central in the subject’s birth, their knotting becomes uncertain at the time of adolescence. Teenage runaways, in what we could refer as « disappearance » happens as the testimony the unknotting : that one of the look and the voice. Thus, to disappear, is to draw off the silence of Other one, a vociferous silence, structured like a jaundiced eye. It is a question, then, to create a place, a space — the one of disappearence — from where the return can be thought.

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No description available.

Test and evaluation (TandE) is a critically important step before in-the-field deployment of radio-frequency (RF) hardware in order to assure that the hardware meets its design requirements and specifications. Typically, TandE is performed either in a lab setting utilizing a software simulation environment or through real-world field testing. While the former approach is typically limited by the accuracy of the simulation models (particularly of the anticipated hardware effects) and by non-real-time data rates, the latter can be extremely costly in terms of time, money, and manpower. To build upon the strengths of these approaches and to mitigate their weaknesses, this work presents the development of an FPGA-based TandE tool that allows for real-time pseudo-random aggregate signal generation for testing RF receiver hardware (such as communication receivers, spectrum sensors, etc.). In particular, a framework is developed for an FPGA-based implementation of a test signal emulator that generates randomized aggregate spectral environments containing signals with random parameters such as center frequencies, bandwidths, start times, and durations, as well as receiver and channel effects such as additive white Gaussian noise (AWGN). To test the accuracy of the developed spectrum generation framework, the randomization properties of the framework are analyzed to assure correct probability distributions and independence. Additionally, FPGA implementation decisions, such as bit precision versus accuracy of the generated signal and the impact on the FPGA's hardware footprint, are analyzed.This analysis allows the test signal engineer to make informed decisions while designing a hardware-based RF test system. This framework is easily extensible to other signal types and channel models, and can be used to test a variety of signal-based applications. / Master of Science / Test and evaluation (TandE) is a critically important step before in-the-field deployment of radio-frequency signal hardware in order to assure that the hardware meets its design requirements and specifications. Typically, TandE is performed either in a lab setting utilizing a software simulation or through real-world field testing. While the former approach is typically limited by the accuracy of the simulation models and by slower data rates, the latter can be extremely costly in terms of time, money, and manpower. To address these issues, a hardware-based signal generation approach that takes the best of both methods mentioned above is developed in this thesis. This approach allows the user to accurately model a radio-frequency system without requiring expensive equipment. This work presents the development of a hardware-based TandE tool that allows for real-time random signal generation for testing radio-frequency receiver hardware (such as communication receivers). In particular, a framework is developed for an implementation of a test signal emulator that allows for user-defined randomization of test signal parameters such as frequencies, signal bandwidths, start times, and durations, as well as communications receiver effects. To test the accuracy of the developed emulation framework, the randomization properties of the framework are analyzed to assure correct probability distributions and independence. Additionally, hardware implementation decisions such as bit precision versus quality of the generated signal and the impact on the hardware footprint are analyzed. Ultimately, it is shown that this framework is easily extensible to other signal types and communication channel models.

Most commercial vehicles currently on the market are still equipped with a passive suspension system, while some luxury brands may already use an adaptive suspension. Active suspension systems on the other hand are rarely found, however, they offer great opportunities to close the gap of the well-known trade-off between ride comfort and handling. Besides that, they can also be used to mitigate single event disturbances, an objective of the USA army as announced in a solicitation which initiated and motivated this research. In addition to that, several studies were found stating the impact and danger of potholes and their impact on the vehicle and passenger. Reviewing the literature, several control strategies for controlling active suspension systems were found. However, most of these approaches used feedback control and did not try to mitigate single event disturbances. Since literature also suggested making use of look ahead preview, research at the Performance Engineering Research Lab at Virginia Tech was started in 2015 combining look ahead preview and an adaptive system to generate optimal force profiles. This introductory research succeeded and proved the used approach to be very promising. However, the used adaptive system was not designed to operate in real-time and did not show any correlation between different road profiles. Therefore, the main objective of this research project is to evaluate and analyze each of the adaptive systems by searching for correlations in their solutions. The results then should be used in order to design a control law which emulates the adaptive system and can be used in a real-time environment. First, an overall research methodology was derived. According to this a software application was developed which extracts ideal force profiles from single event disturbance signals in order to mitigate their impact to the vehicle. The application uses a quarter car model with a partially loaded active suspension system, a set of predefined road profiles, a road profile preprocessor, and an adaptive algorithm. The preprocessing includes geometric filtering using a Tandem-Cam Model and the adaptive processor used an iterative version of the Filtered-X Last-Mean-Square algorithm. During evaluation and analysis of several generated data sets, high correlations in the generated and adjusted adaptive systems were discovered. From these an empirical and theoretical universal filter model was derived, which was then used to design an open-loop control law named Optimal Force Control. The original control law and an adjusted version designed for a real-time environment were tested for all predefined road profiles over all considered vehicle velocities and prove to perform much better than the offline solution using the adaptive system. In summary, a control law named Optimal Force Control was designed which can be used and implemented in a vehicle to extract an analytical and ideal force profile given a road profile input. Implementing an active suspension system with tracking controller, this approach can be used in order to mitigate single event disturbance signals by reducing the vertical vehicle acceleration. / Master of Science / Most commercial vehicles currently on the market are still equipped with a suspension system consisting of springs and shock absorbers (passive suspensions), while some luxury brands already use suspension systems including parts which can change their behavior based on the driving situation (active suspensions). While these active suspension systems are still rarely found, they offer great opportunities to make the vehicle stable and at the same time easy to handle. Also, they have the potential to reduce the risk of an accident while driving over a pothole or disturbance in the road, an objective of the USA Army as announced in a solicitation which initiated and motivated this research. Reviewing the literature, several control strategies for controlling active suspension systems were found. However, most of these approaches required measuring the current state of the suspension system. Research at the Performance Engineering Research Lab at Virginia Tech was started in 2015 in order to control active suspension systems by using data of the road profile ahead of the vehicle. This introductory research succeeded and proved the approach used to be very promising. However, the used system was designed to work in a laboratory environment only. Therefore, the main objective of this research project was to evaluate and analyze the used control strategy by searching for intersections and similarities in the different solutions. The results were then used to design a control strategy which can be applied in a real-world vehicle environment. First, an overall research methodology was derived. According to this methodology a software application was developed that generates the ideal control signal for the active suspension system in order to reduce the impact of a disturbance in the road profile. To that end a set of predefined road profiles were used, and a computer algorithm called Filtered-X Last-Mean-Square algorithm calculated the ideal control signal for the active suspension system. During the evaluation and analysis of several generated data sets, a lot of intersections and similarities were discovered. Based on these findings a new control strategy was designed in order to be implemented into a real-world vehicle environment. The new control strategy for the real-world vehicle environment was tested for all predefined road profiles over all considered vehicle velocities and proved to outperform the control strategy for the laboratory environment. In summary, a new control strategy named Optimal Force Control was designed, which can be used and implemented in a vehicle. The implementation of an active suspension system can be used to mitigate disturbances in the road by reducing the vertical vehicle acceleration.