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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 25 for “"cubic splines"”.
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Linear lumped and distributed system identification with cubic splines.
Dept. of Electrical and Computer Engineering. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis1973 .B26. Source: Dissertation Abstracts International, Volume: 62-13, Section: A. Thesis (Ph.D.)--University of Windsor (Canada), 1973.
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Modeling daily electricity load curve using cubic splines and functional principal components
… autoregressive moving average method (ARMA) and cubic spline models. The second approach is suitable for obtaining long-term forecasts of the daily electricity load and employs cubic splines with time varying coefficients. These coefficients are modeled as a multivariate time series using a …
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Practical algorithms for image compression and surface estimation
… that incorporates kriging and parametric cubic splines. Two of the image compression algorithms are innovative extensions of the Run Length Encoding image compression algorithm and the third is an image compression technique based on kriging. In general the modified Run Length Encoding …
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Quantification of acid loads and delineation of hydrochemical facies at a phreatic mine spoil aquifer
… water chemistry was interpolated with natural cubic splines, resampled and multiplied by high-frequency flow to produce estimates of acid loads at high-frequency. Cross-correlation between high-frequency and low-frequency datasets showed an exponential decrease in correlation as the number of …
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Constructing growth reference curves for a cohort of South African children
… for the longitudinal profiles, including cubic splines, fractional polynomials and Berkey-Reed First and Second Order models. The preferred approach was to use the Box-Cox Power Exponential (BCPE) distribution with curve smoothing by cubic splines. Non-parametric quantile regression served …
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ΑΛΓΟΡΙΘΜΟΙ ΠΑΡΕΜΒΟΛΗΣ ΓΙΑ ΜΗΧΑΝΟΥΡΓΙΚΕΣ ΚΑΤΕΡΓΑΣΙΕΣ ΜΕΓΑΛΗΣ ΑΚΡΙΒΕΙΑΣ ΚΑΙ ΠΟΛΥΠΛΟΚΗΣ ΓΕΩΜΕΤΡΙΑΣ
… OF THE MACHINE TOOL. IT IS SHOWN THAT FOR CUBIC SPLINES OF BICUBIC PATCHES, ACCURATE TOOL MOTION CAN BE GENERATED BY A FAST DDA-LIKE (DIGITAL DIFFERENTIAL ANALYZER) DIGITAL INTEGRATION SCHEME.
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Nonparametric smoothing in extreme value theory
… penalty approach, in which smoothed natural cubic splines are fitted to the location and scale parameters of the generalized extreme value distribution and the distribution of the r largest order statistics. Estimation is performed by implementing a Fisher scoring algorithm to maximize the …
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Splines and local approximation of the earth's gravity field
… construction procedure for rotation-invariant splines on Euclidean spaces, splines on the circle, and splines on the sphere and harmonic outside the sphere. Spherical splines and surface splines such as multi-conic functions, Hardy's multiquadric functions, pseudo-cubic splines, and thin-plate …
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The relationship between body mass index and breast cancer recurrence/progression and breast cancer-specific death
… and breast cancer-specific death. Restricted cubic splines were used to model nonlinear effects. Receiver operator characteristic areas under the curves (ROC AUC) were used to evaluate prediction. BMI was nonlinearly associated with recurrence/progression and death (p= 0.0230 and 0.0101). …
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Pricing 2-colour rainbows : nonparametric methods using copulae
… in question, a continuum of option prices exist. Cubic splines were used to fit this continuum to the implied volatilities of the actual options available. Two nonparametric copulae were considered: an empirical copula based directly upon the data and a kernel copula derived from a smooth …
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Autonomous Vehicle Waypoint Navigation Using Hyper-Clothoids
… given waypoints with C1 continuity using Hermite cubic splines which is used as a reference path for the controller to track. The PID controller uses lateral and heading error to generate a steering profile for the vehicle to track the constructed reference path. A novel real time solution is …
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Robust Control and Motion Planning for Nonlinear Underactuated Systems Using H -Infinity Techniques
… The basic motion planning algorithm uses cubic splines or Pythagorean hodograph curves to connect the initial and final configurations and to generate a feasible trajectory for the system. The feasible trajectory and its control inputs are improved through an iterative Hinfinity-filter. …
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On-board near-optimal climb-dash energy management
… functions of energy, they are represented using cubic splines for real-time implementation, requiring minimal onboard computaional and storage capabilities. The problem which was studied was to maximise range in symmetric flight with fuel open. Some computational results are presented comparing …
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Essays in Power System Economics
… the supply functions of the competitors with cubic splines. We argue that this method is preferable to approximation by linear or piecewise-affine functions, which have been the main approaches to date. We apply our method to the firms competing in the Texas market. We also show that, more …
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Finite element analysis of 3D electric machine problems
… using the Newton-Raphson method. We utilize cubic splines and relaxation factors to improve the convergence of the Newton-Raphson iteration.
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Entwicklung einer simultanen refraktions- und reflexionsseismischen 3D-Laufzeittomographie mit Anwendung auf tiefenseismische TRANSALP-Weitwinkeldaten aus den Ostalpen
… reflectors are modelled on separate grids by bi-cubic splines, and an appropriate reflection ray tracer was developed using the Approximate Ray Tracing/Pseudo Bending (ART/PB) method. Accuracy was adjusted by several means: arcuate ART trajectories are roughly adjusted to the velocity field …
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Investigation of over-fitting and optimism in prognostic models
… (AIC, BIC), specification of functional form (cubic splines and fractional polynomials) and validation methods (cross-validation, bootstrap methods). The concepts of over-fitting and optimism are examined. The author concludes that whilst Harrell’s strategy is valuable it is still quite …
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Design of multifunctional paired robots engaged across a thin plate for aircraft manufacturing and maintenance
… position trajectories are parameterized using cubic splines with the bounds being the start and end robot configurations. Prototype paired robots are constructed and experimentally tested. The prototype robots performed their multifunctional operation modes on a mock wing structure, validating …
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Revision knee replacement outcomes and implications for the organisation of care in the NHS: Can regional networks improve outcomes?
… fixed effects models with restricted cubic splines revealed that for first-time RevKR for non-infected causes, higher surgeon volume was associated with lower re-revision rates. For revisions due to prosthetic joint infection, the relationship between volume and outcome was more …
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On an Effective Submodeling Procedure for Stresses Determined with Finite Element Analysis
… of different orders, and for shape functions and cubic splines or bicubic surfaces for interpolating displacements in boundary conditions. For all these problems, whenever estimates of the boundary-condition errors indicate that there is a need to enlarge the subregion, actual errors due to cut …
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