Blar i Institutt for matematiske fag på tittel
Viser treff 1884-1903 av 2364
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Shape analysis on lie groups and homogeneous spaces
(Journal article, 2017)In this paper we are concerned with the approach to shape analysis based on the so called Square Root Velocity Transform (SRVT). We propose a generalisation of the SRVT from Euclidean spaces to shape spaces of curves on ... -
Shapley Values for dependent features using Divisive Clustering
(Master thesis, 2022)Formålet med denne oppgave er å anvende den nye metoden DivisiveShapApprox på å approksimere SHAP-verdier og å sammenlikne dens prestasjoner med KernelSHAP-metoden. Det er for tiden mange metoder som gjør det mulig å ... -
A shared parameter model accounting for non-ignorable missing data due to dropout - Modelling of blood pressure based on the HUNT Study
(Master thesis, 2020)Abstract In this thesis, a shared parameter model is suggested to account for missing data not at random (MNAR) due to dropout in follow-up studies. The proposed model is motivated by and evaluated for a large follow-up ... -
Sharp norm estimates for composition operators and Hilbert-type inequalities
(Journal article; Peer reviewed, 2017)Let H 2 denote the Hardy space of Dirichlet series f ( s ) = ∑ n ⩾ 1 a n n − s with square summable coefficients and suppose that φ is a symbol generating a composition operator on H 2 by C φ ( f ) = f ∘ φ . Let ζ denote ... -
Shifted Substitution in Non-Commutative Multivariate Power Series with a View Toward Free Probability
(Peer reviewed; Journal article, 2023)We study a particular group law on formal power series in non-commuting variables induced by their interpretation as linear forms on a suitable graded connected word Hopf algebra. This group law is left-linear and is ... -
Ship Tracking Based on Fiber Optic Cable Data
(Master thesis, 2020)På havbotnen rundt om i verda finns det eit nettverk av fiberoptiske kablar. Ved å kombinera desse kablane med ein teknologi kalla distribuert akustisk måling, kan det kanskje vera mogleg å bruka data frå kablane til å ... -
Shock interactions for the Burgers-Hilbert equation
(Peer reviewed; Journal article, 2022)This paper provides an asymptotic description of a solution to the Burgers-Hilbert equation in a neighborhood of a point where two shocks interact. The solution is obtained as the sum of a function with H2 regularity away ... -
Short Identity-Based Signatures with Tight Security from Lattices
(Peer reviewed; Journal article, 2021)We construct a short and adaptively secure identity-based signature scheme tightly based on the well-known Short Integer Solution (SIS) assumption. Although identity-based signature schemes can be tightly constructed from ... -
Short Paper: An Update on Marked Mix-Nets: An Attack, a Fix and PQ Possibilities
(Peer reviewed; Journal article, 2020)Marked mix-nets were introduced by Pereira and Rivest as a mechanism to allow very efficient mixing that ensures privacy but at the cost of not guaranteeing integrity. This is useful in a number of e-voting schemes such ... -
Short-Term Electric Load Forecasting Using Artificial Neural Networks
(Master thesis, 2018)Short-term forecasting of power consumption is an important tool for decision makers in the energy sector. Power load forecasting is a challenging multi-step ahead time series forecasting problem since the power load is ... -
Shortcomings in the milieu for algebraic generalisation arising from task design and vagueness in mathematical discourse
(Chapter, 2013)This paper presents how the milieu for students’ engagement with an algebraic generalisation task is constrained by two factors: first, by the task design; second, by the students’ unawareness of the nature of a mathematical ... -
Shorter QA-NIZK and SPS with Tighter Security
(Chapter, 2019)Quasi-adaptive non-interactive zero-knowledge proof (QA-NIZK) systems and structure-preserving signature (SPS) schemes are two powerful tools for constructing practical pairing-based cryptographic schemes. Their efficiency ... -
Short‐term insurance versus long‐term bet‐hedging strategies as adaptations to variable environments
(Journal article; Peer reviewed, 2018)Understanding how organisms adapt to environmental variation is a key challenge of biology. Central to this are bet‐hedging strategies that maximize geometric mean fitness across generations, either by being conservative ... -
Shuffle Algebras and Non-Commutative Probabilifor Pairs of Faces
(Peer reviewed; Journal article, 2023)One can build an operatorial model for freeness by considering either the right-handed or the left-handed representation of algebras of operators acting on the free product of the underlying pointed Hilbert spaces. Considering ... -
Shuffle group laws: applications in free probability
(Peer reviewed; Journal article, 2019)Commutative shuffle products are known to be intimately related to universal formulas for products, exponentials and logarithms in group theory as well as in the theory of free Lie algebras, such as, for instance, the ... -
Shunning algebraic formalism: Student teachers and the intricacy of percents
(Journal article; Peer reviewed, 2020)This paper investigates primary and lower secondary school student teachers’ use and mastery of algebraic formalism in solving the task of determining the rate of increase of a square’s area when the square’s side increases ... -
Side channels in deduplication: trade-offs between leakage and efficiency
(Chapter, 2017)Deduplication removes redundant copies of files or data blocks stored on the cloud. Clientside deduplication, where the client only uploads the file upon the request of the server, provides major storage and bandwidth ... -
Signatures in Shape Analysis: an Efficient Approach to Motion Identification
(Master thesis, 2019)Signaturer gir en konsis beskrivelse av visse geometriske egenskaper ved en kurve - på en reparameteriseringsinvariant måte. Vi foreslår en metode for å klassifisere former basert på signaturer, og sammenligner den med ... -
Signatures in Shape analysis: An efficient approach to motion identification
(Peer reviewed; Journal article, 2019)Signatures provide a succinct description of certain features of paths in a reparametrization invariant way. We propose a method for classifying shapes based on signatures, and compare it to current approaches based on the ... -
Signatures with Tight Multi-user Security from Search Assumptions
(Peer reviewed; Journal article, 2020)We construct two tightly secure signature schemes based on the computational Diffie-Hellman (CDH) and factoring assumptions in the random oracle model. Our schemes are proven secure in the multi-user setting, and their ...