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Nestriktās ekvivalences nestriktās klasterizācijas algoritmā
2022
Maģistra darba mērķis ir iepazīstināt lasītāju ar izstrādātu, ERAF projekta ietvaros, klasterizācijas metodi FERC, un parādīt tās priekšrocības salīdzinājumā ar nestrikto C-means. Projekta rezultāti tiks publicēti žurnālā Springer. FERC metodē, mēs ieviešam nestrīktās ekvivalences attiecības dažādiem objekta atribūtiem, un tad mēs agregējam šīs nestriktās ekvivalences attiecības vienā, lai noteiktu objekta piederības pakāpi kādam klasterim. Darbā tiek parādīts, ka klasterizācijas procesā, katram objekta atribūtam var uzdot tā nozīmīgumu, ieviešot atribūtu svarus. Līdz šim klasterizācijas procesā, atribūtu svari netika izmantoti. Kā arī darbā tiek parādīti ilustratīvi piemēri.
Reduced Order Models for Pricing American Options under Stochastic Volatility and Jump-diffusion Models
2016
American options can be priced by solving linear complementary problems (LCPs) with parabolic partial(-integro) differential operators under stochastic volatility and jump-diffusion models like Heston, Merton, and Bates models. These operators are discretized using finite difference methods leading to a so-called full order model (FOM). Here reduced order models (ROMs) are derived employing proper orthogonal decomposition (POD) and non negative matrix factorization (NNMF) in order to make pricing much faster within a given model parameter variation range. The numerical experiments demonstrate orders of magnitude faster pricing with ROMs. peerReviewed
Cluster-Based RF Fingerprint Positioning Using LTE and WLAN Outdoor Signals
2015
In this paper we evaluate user-equipment (UE) positioning performance of three cluster-based RF fingerprinting methods using LTE and WLAN signals. Real-life LTE and WLAN data were collected for the evaluation purpose using consumer cellular-mobile handset utilizing ‘Nemo Handy’ drive test software tool. Test results of cluster-based methods were compared to the conventional grid-based RF fingerprinting. The cluster-based methods do not require grid-cell layout and training signature formation as compared to the gridbased method. They utilize LTE cell-ID searching technique to reduce the search space for clustering operation. Thus UE position estimation is done in short time with less comput…
Process and product in non-narrative writing : a teaching material package for the upper secondary school
1997
Il design della Tecno-Natura. Nuovi scenari del design sostenibile nell'epoca delle nanotecnologie.
2011
The Tucker tensor decomposition for data analysis: capabilities and advantages
2022
Tensors are powerful multi-dimensional mathematical objects, that easily embed various data models such as relational, graph, time series, etc. Furthermore, tensor decomposition operators are of great utility to reveal hidden patterns and complex relationships in data. In this article, we propose to study the analytical capabilities of the Tucker decomposition, as well as the differences brought by its major algorithms. We demonstrate these differences through practical examples on several datasets having a ground truth. It is a preliminary work to add the Tucker decomposition to the Tensor Data Model, a model aiming to make tensors data-centric, and to optimize operators in order to enable…
CCDC 662715: Experimental Crystal Structure Determination
2008
Related Article: J.Bould, A.Laromaine, N.J.Bullen, C.Vinas, M.Thornton-Pett, R.Sillanpaa, R.Kivekas, J.D.Kennedy, F.Teixidor|2008|Dalton Trans.||1552|doi:10.1039/b715845a
CCDC 1958345: Experimental Crystal Structure Determination
2020
Related Article: Raphael C. A. Vaz, Isabela O. Esteves, Willian X. C. Oliveira, João Honorato, Felipe T. Martins, Lippy F. Marques, Guilherme L. dos Santos, Ricardo O. Freire, Larissa T. Jesus, Emerson F. Pedroso, Wallace C. Nunes, Miguel Julve, Cynthia L. M. Pereira|2020|Dalton Trans.|49|16106|doi:10.1039/D0DT02497J
CCDC 911161: Experimental Crystal Structure Determination
2013
Related Article: Jesús Ferrando-Soria, María Castellano, Rafael Ruiz-García, Joan Cano, Miguel Julve, Francesc Lloret, Catalina Ruiz-Pérez, Jorge Pasán, Laura Cañadillas-Delgado, Donatella Armentano, Yves Journaux , Emilio Pardo|2013|Chem.-Eur.J.|19|12124|doi:10.1002/chem.201204484
CCDC 1982787: Experimental Crystal Structure Determination
2020
Related Article: Souvik Maity, Tanmoy Kumar Ghosh, Carlos J. Gómez-García, Ashutosh Ghosh|2020|Cryst.Growth Des.|20|7300|doi:10.1021/acs.cgd.0c00957