Second order level set projection method for incompressible Navier-Stokes equations is proposed to solve flow around arbitrary geometries. We used rectilinear grid with collocated cell centered velocity and pressure. An explicit Godunov procedure is used to address the nonlinear advection terms, and an implicit Crank-Nicholson method to update viscous effects. An approximate pressure projection is implemented at the end of the time stepping using multigrid as a conventional fast iterative method. The level set method developed by Osher and Sethian [17] is implemented to address real momentum and pressure boundary conditions by the advection of a distance function, as proposed by Aslam [3]. Numerical results for the Strouhal number and drag coefficients validated the model with good accuracy for flow over a cylinder in the parallel shedding regime (47 < Re < 180). Simulations for an array of cylinders and an oscillating cylinder were performed, with the latter demonstrating our methods ability to handle dynamic boundary conditions.

Film screenings in painting In his theoretical work and film storyboard artwork I had the opportunity to prepare the philosophical basis for the practical part of the thesis. I was inspired by many authors with different approaches to film and film footage contemplation. For me as a creator, it was important to work with what is well-known. I dealt with the question of whether he could reality that surrounds us, filmic look when she make her over. After previous experience of seeing the painting, which draws on the film composition and borrowing of foreign ideas, I decided - as well as a film director - search for compositions which can be seen in the reality around us. Following my bachelor thesis, which was purely monochromatic cycle, I now chose a color theme and I returned to the activities that precede the making of the film. Our eye can function as a film lens. A seemingly ordinary reality is for me a pretext for building atmospheric film scene. For a long time I wore a camera with me, which was ready to use the moment I discovered an interesting space or situation. Patterns for paintings I naturally found in my travels around the city. I specifically sought location, which could be part of an imaginary film. For me, the composition under sunny streets huddled different feeling and unfinished, something that comes and works below the surface of each image in parallel. I hope linking reality and personal paintings will boost the atmosphere as value added. Name Film screenings in painting refers to the vocabulary filmmakers, the author looks at the experiences around film composition. In my work I wanted to simulate the Czech local, peculiar atmosphere of the place. During the work, there was a change from the original plan, and that the originals are really own, nevypůjčené. Heroes paintings are everyday people with their personal stories. However, there is a blending and assimilation of different film genres. For example, an image with the workers and the working machine has a compositional compliance with the sci-fi film, light and story recall something that we could ever see. Compared painters who have the means to extensive designed templates, I worked with a range that can be found only through accurate observation of reality. Construction patterns and Figures, therefore, actor scene, I could not prepare in advance. I counted with the fact that something interesting camera ready to capture and scene appeared before me. A crucial part of the process of my work was therefore observation and effort as possible to capture the genius loci.

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Yes / Objectives: Unlike the technological advances in cross-sectional imaging, the adoption of CR and DR has been relatively overlooked in terms of the additional radiographer skills and competences required for optimal practice. Furthermore, projection radiography is often referred to as basic, plain or other words suggesting simplicity or entry-level skill requirements. Radiographers’ professional identity is connected with the discourse expressed via the language used in daily practice and consequently, if the perception of projection radiography is regarded as simple practice not requiring much reflection or complex decision-making, apathy and carelessness may arise. The purpose of this narrative review was to raise projection radiography from its longstanding lowly place and re-position it as a specialist imaging field. Key findings: Danish pre-registration radiography curricula contain little mention of projection radiography and a low proportion (n ¼ 17/144; 11.8%) of Danish radiography students chose to focus on projection radiography within publicly available BSc. theses between 2016 and 2020 as compared to topics related to CT and MRI (n ¼ 60/144; 41.7%). Conclusion: By changing how we as the profession perceive the role and position of projection radiography, we can start to rebuild its lost prestige and demand a greater, more detailed and clinically relevant educational offering from academic partners. For this to commence, the language and terminology we use to describe ourselves and tasks undertaken must reflect the complexity of the profession. Implications for practice: Regardless of imaging modality, every patient should be assured that a radiographer with expertise in acquiring images of diagnostic quality undertakes their examination. Reclaiming the prestige of projection radiography may lead students and radiographers to recognize projection radiography as a demanding specialist field for the benefit of the patients.

The improved spectral resolution of modern hyperspectral sensors provides a means for discriminating subtly different classes of on ground materials in remotely sensed images. However, in order to obtain statistically reliable classification results, the number of necessary training samples can increase exponentially as the number of spectral bands increases. Obtaining the necessary number of training signals for these high-dimensional datasets may not be feasible. The problem can be overcome by preprocessing the data to reduce the dimensionality and thus reduce the number of required training samples. In this thesis, three dimensionality reduction methods, all based on parametric projection pursuits, are investigated. These methods are the Sequential Parametric Projection Pursuits (SPPP), Parallel Parametric Projection Pursuits (PPPP), and Projection Pursuits Best Band Selection (PPBBS). The methods are applied to very high spectral resolution data to transform the hyperspectral data to a lower-dimension subspace. Feature extractors and classifiers are then applied to the lower-dimensional data to obtain target detection accuracies. The three projection pursuit methods are compared to each other, as well as to the case of using no dimensionality reduction preprocessing. When applied to hyperspectral data in a precision agriculture application, discriminating sicklepod and cocklebur weeds, the results showed that the SPPP method was optimum in terms of accuracy, resulting in a classification accuracy of >95% when using a nearest mean, maximum likelihood, or nearest neighbor classifier. The PPPP method encountered optimization problems when the hyperspectral dimensionality was very high, e.g. in the thousands. The PPBBS method resulted in high classification accuracies, >95%, when the maximum likelihood classifier was utilized; however, this method resulted in lower accuracies when the nearest mean or nearest neighbor classifiers were used. When using no projection pursuit preprocessing, the classification accuracies ranged between ~50% and 95%; however, for this case the accuracies greatly depended on the type of classifier being utilized.

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Nowadays the development of the screen technology is really fast, there are lcd, led, oled screen and many kinds of screens. They all have their own advantages and disadvantages, LCD screen is usually constrained by the size, and the LED screen is usually constrained by the resolution. In this thesis I will introduce a tiled projection screen which combined LED and LCD together. My major work is to develop algorithms which are used to solve three major problems. The first problem is the radial distortion caused by the lens. This problem is different from the usual distortion correction problem, the method used in this thesis is a reverse process of the camera calibration and the key is to simulate the distortion formula. The second problem is the complex brightness condition of the tiled projected image. In the thesis a non-linear edge blending method is applied so the projected images could merge together seamlessly. The third problem is combination of the LED and the LCD without harming the resolution of the whole picture. The result shows that the size and the resolution have been improved greatly. / Thesis / Master of Applied Science (MASc)