Essays about: "without inversion"

Showing result 6 - 10 of 23 essays containing the words without inversion.

1. 6. Evaluation of the applicability of geophysical methods when characterizing mine waste in Yxsjöberg, Sweden

   University essay from Luleå tekniska universitet/Geovetenskap och miljöteknik

   Author : Palo Matilda; [2021]
   Keywords : geophysics; Yxsjöberg; mine tailings;

   Abstract : Smaltjärnen tailings repository located in Yxsjöberg, Sweden, attracts researchers with questions regarding characterization and potential re-mining. This thesis continuous geophysical characterization done by researchers from the Exploration Geophysics department at Luleå University of Technology but using new data from 2019. READ MORE

3. 7. Machine Unlearning and hyperparameters optimization in Gaussian Process regression

   University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

   Author : Matthis Manthe; [2021]
   Keywords : GDPR; Machine Unlearning; Data removal; Gaussian Process Regression; Product-of-Experts.; RGPD; Désapprentissage; Suppression de données; Gaussian Process regression; Product-of-Experts.; DSF; avlärningen; dataraderingen; Gaussian Process regression; Produkt-av-experter.;

   Abstract : The establishment of the General Data Protection Regulation (GDPR) in Europe in 2018, including the "Right to be Forgotten" poses important questions about the necessity of efficient data deletion techniques for trained Machine Learning models to completely enforce this right, since retraining from scratch such models whenever a data point must be deleted seems impractical. We tackle such a problem for Gaussian Process Regression and define in this paper an efficient exact unlearning technique for Gaussian Process Regression which completely include the optimization of the hyperparameters of the kernel function. READ MORE

4. 8. 1D and 2D Modelling of AMT and CSAMT Measurements from Swedish Lapland - A Case Study

   University essay from Uppsala universitet/Institutionen för geovetenskaper

   Author : Lisa Dossow; [2018]
   Keywords : audiomagnetotellurics; controlled source audiomagnetotellurics; Gällivare; Kiruna; time series processing; 1D and 2D inversion;

   Abstract : Audiomagnetotelluric measurements with (CSAMT) and without (AMT) a controlled source were performed near Gällivare and Kiruna in Swedish Lapland in order to retrieve representative conductivity models of the subsurfaces. Magnetotelluric transfer functions were gained from processed time series’ and subsequently inverted to generate the sought models successfully. READ MORE

5. 9. Subharmonic Imaging of Polymer-Shelled Contrast Agents

   University essay from KTH/Skolan för kemi, bioteknologi och hälsa (CBH)

   Author : Rúnar Sigmundsson; [2018]
   Keywords : Ultrasound Imaging; Contrast Enhanced Ultrasound Imaging; Contrast Agents; PVA Contrast Agents;

   Abstract : The harmonic generation due to the nonlinear behavior of Ultrasound Contrast Agents (UCAs) must be exploited for improved efficiency when imaging vascular targets in the neighborhood of highly echogenic tissue. One may even further improve the efficiency by focusing on the subharmonic generation of the UCAs, which is an even more exclusive property than the generation of higher harmonics, for improved Contrast-to-Tissue ratio (CTR). READ MORE

6. 10. Interpretation of geophysical and geochemical data in a 3D geological model construction of a contaminated site

   University essay from Lunds universitet/Teknisk geologi; Lunds universitet/Väg- och vattenbyggnad (CI)

   Author : Haoyu Wei; [2018]
   Keywords : Halogenated hydrocarbon; Geophysics; DCIP; GeoScene3D; Groundwater chemistry; Earth and Environmental Sciences; Technology and Engineering;

   Abstract : The Alingsås dry-cleaning facility is one of the heavily halogenated hydrocarbon contaminated sites in Sweden. The source of contamination dates back to the 1970s when a large scale tetrachloroethylene leakage outbroke inside the dry-cleaning building. READ MORE