Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 150 for “"Centroid"”.
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An Arithmetic-Based Deterministic Centroid Initialization Method for the k-Means Clustering Algorithm
… is positioning the initial cluster centers, or centroids, as close to optimal as possible, and doing so in an amount of time deemed reasonable. Traditional fc-means utilizes a randomization process for initializing these centroids, and poor initialization can lead to increased numbers of …
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Fast star tracker centroid algorithm for high performance CubeSat with air bearing validation
… optical sensor provides star images from which a centroiding algorithm estimates the star locations on the optical focal plane. The star locations are used for both the optical control loop and satellite attitude determination. The centroiding algorithm requires a short processing time to maximize …
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An investigation into the effects of the shifting centroid and shear centre in notched steel beams undergoing elastic lateral torsional buckling
… Since the notched region is monosymmetric the centroid and shear centre in this region are at different vertical heights. The design for Lateral Torsional Buckling (LTB) in standard prismatic sections accounts for the monosymmetry through the monosymmetry factor which accounts for the …
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Three Novel Algorithms for Triangle Mesh Processing: Progressive Delaunay Refinement Mesh Generation, Mls-Based Scattered Data Interpolation and Constrained Centroid Voronoi-Based Quadrangulation
The last problem I address in the thesis is the conversion of triangle meshes to quadrilateral meshes. Although triangle meshes are preferred in most of applications, quadrilateral meshes show more stability in scientific computation. Because most of acquisition and mesh generation methods result …
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The Use of The Sectorial Coordinate Approach to Demonstrate Unique Shear Centre Properties of Nonstandard Monosymmetric Steel Sections
… of the shear centre with reference to the centroid is carefully studied as the geometry of the section is changed. The study shows investigations of the sections which are 152x152x30 UC H-section, the same H-section with 2/3 as well as 1/3 of the bottom flange width and a 203x178x30 …
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Applications of reference cycle building and K-shape clustering for anomaly detection in the semiconductor manufacturing process
… on optimized ways to build reference cycles, or centroids of univariate parameters, a critical component to determine clustering accuracy and to facilitate process engineers' offline anomaly detections and diagnoses. Three time series centroid building methods are discussed and evaluated in the …
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Impact of the boundary layer on pointing and tracking in airborne free-space laser communication links
… challenge using a focal plane array sensor with centroid and peak tracking algorithms. Also investigated was the use of a deformable mirror to recreate optical phase distortions from boundary layer turbulence. Experiments were conducted with realistic channel effects for multiple look angles …
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Path-integral studies of quantum statistical effects in vibrational spectroscopy
… coupling between the imaginary-time path centroid and the fluctuations around it. This coupling causes the amplitudes of the relevant centroid vibrations to be ‘Matsubara heated’ to an effective temperature that is consistent with the underlying quantum distribution. Quantum coherence thus …
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Domain Adaptation with a Classifier Trained by Robust Pseudo-Labels
… information for each category, I deploy centroid-to-centroid alignment to perform domain adaptation. An Exponential Moving Average strategy (EMA) is used to ensure we can form robust source and target centroids. A Gaussian-uniform mixture model is trained using an Expectation-Maximization …
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Approximations to Matsubara Dynamics for Vibrational Spectra
… methods like ring-polymer molecular dynamics and centroid molecular dynamics introduce well-understood artefacts in the high-frequency stretching modes. Quasicentroid molecular dynamics (QCMD), a curvilinear mean-field approximation to Matsubara dynamics, alleviates the curvature problem …
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An earth image simulation and tracking system for the Mars Laser Communication Demonstration
… to provide test; data sets. While a plain centroiding algorithm, thresholded-centroiding algorithm, cross-spectrum phase correlation method, and optical flow algorithm were all tested under various Earth phase conditions and pixel resolutions to evaluate their performance on simulated test …
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Lateral-torsional buckling behaviour of monosymmetric steel sections formed with flange upstands
… of shear center relative to the geometric centroid being of particular interest. It is observed that the shear center initially moves away from the centroid towards the stiffened flange, reaches a stationery point and then starts to move away from this flange. This leads to the shear center …
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A general procedure for analysis of elastic rings in space
… of three dimensional elastic rings. An elastic centroid for the elastic ring has been located with a tabular procedure for exacting the solution to the problem. For a comparison of the solutions between the method based on three elastic centroids with the method based on one elastic centroid, …
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PROBLEMI DI CLUSTERING CON VINCOLI: ALGORITMI E COMPLESSITÀ
… Σk Σi Ak |xi - μk |p where μk is the p-centroid of Ak First, we prove that the optimum partition is contiguous (String Property), that is if i,j Ak, and xi < xs < xj, then s Ak . As a consequence, we determine an efficient algorithm for bi-clustering (if p is an integer); however, we …
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Timbre perception of cultural insiders : a case study with Javanese gamelan instruments
… showed that in the isolated tone context, attack centroid (a measure of the spectral energy distribution during the initial 50 milliseconds of the tone) was emphasized almost equally by both groups, along with an unknown psychological factor. In the melodic context, the Gamelan group focused their …
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DECENTRALIZED NETWORK BANDWIDTH PREDICTION AND NODE SEARCH
… a decentralized algorithm to search for a centroid node that has high-bandwidth connections with a given set of nodes. The algorithm can find a centroid accurately and efficiently using the bandwidth data produced by the prediction algorithm. Last, we have designed another type of …
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Density estimation and some topics in multivariate analysis
… partially successful. Part II, entitled "The centroid method of numerical integration", begins with a discussion of the often slighted midpoint method of numerical integration, then, using Taylor's theorem, generalized formulae for the centroid method of numerical integration of a function of …
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Acoustic-based assistive technology tools for dysarthria managment
… One extracts an extended speech feature called centroid formant (which is a representation of energy concentration in the frequency spectrum) and classifies these centroid formants using neural network classifiers for the detection of dysarthria. The centroid formant-based detection scheme also …
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Iron and sodium Doppler/temperature lidar studies of the upper mesosphere
… October 1989. The average Fe abundances, layer centroid heights and rms widths varied between 1.0-2.0 $\times$ 10$\sp{10}$ cm$\sp{-2}$, 89.0-90.5 km and 3.2-4.1 km, respectively. The peak densities of the layer near 90 km varied between 15-25 $\times$ 10$\sp3$ cm$\sp{-3}$. On three nights the …
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Time characteristics of small watersheds in response to the probable maximum precipitation
… <p>Lag time was defined as the time between the centroid of the excess rainfall hyetograph and the centroid of the direct runoff hydrograph.</p> <p>Rainfall depth, rainfall duration, and the distribution of rainfall intensity were found to be significant predictor variables for lag time. Defined …
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