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Università della Svizzera italiana

Multilevel minimization in trust-region framework : algorithmic and software developments

Kopaničáková, Alena ; Krause, Rolf (Dir.)

Thèse de doctorat : Università della Svizzera italiana, 2020 ; 2020INFO021.

The field of scientific computing is associated with the modeling of complex physical phenomena. The resulting numerical models are often described by differential equations, which, in many cases, can be related to non-convex minimization problems. Thus, after discretization, the solution of large-scale non-convex optimization problem is required. Various iterative solution strategies can be...

Université de Fribourg

Self-avoiding walk on $\mathbb{Z}^{2}$ with Yang–Baxter weights: Universality of critical fugacity and 2-point function

Glazman, Alexander ; Manolescu, Ioan

In: Annales de l’Institut Henri Poincaré, Probabilités et Statistiques, 2020, vol. 56, no. 4, p. 2281–2300

We consider a self-avoiding walk model (SAW) on the faces of the square lattice Z2. This walk can traverse the same face twice, but crosses any edge at most once. The weight of a walk is a product of local weights: each square visited by the walk yields a weight that depends on the way the walk passes through it. The local weights are parametrised by angles θ∈[π3,2π3] and satisfy the...

Università della Svizzera italiana

Learning structured neural representations for visual reasoning tasks

van Steenkiste, Sjoerd ; Schmidhuber, Jürgen (Dir.)

Thèse de doctorat : Università della Svizzera italiana, 2020 ; 2020INFO019.

Deep neural networks learn representations of data to facilitate problem-solving in their respective domains. However, they struggle to acquire a structured representation based on more symbolic entities, which are commonly understood as core abstractions central to human capacity for generalization. This dissertation studies this issue for visual reasoning tasks. Inspired by how humans solve...

Eidgenössisches Hochschulinstitut für Berufsbildung EHB

Who is included in VET, who not?

Scharnhorst, Ursula ; Kammermann, Marlise

In: Education + Training, 2020, vol. 62, no. 6, p. 645-658

Purpose The paper describes the Swiss Vocational Education and Training (VET) system, its crucial role and challenges with respect to the inclusion of vulnerable groups and investigates the effectiveness of the efforts undertaken to promote inclusion in VET so far. Design/methodology/approach Empirical research focusing on various indicators of inclusion (national monitoring data and own studies)...

Université de Fribourg

Unsupervised and Parameter-Free Clustering of Large Graphs for Knowledge Exploration and Recommendation

Lutov, Artem ; Cudré-Mauroux, Philippe (Dir.)

Thèse de doctorat : Université de Fribourg, 2020 ; no. 2192.

We live in an Information Age, facing a rapid increase in the amount of information that is exchanged. This permanently growing amount of data makes the ability to store, analyze, and act upon information a primary concern (in addition to the obvious privacy, legal and ethical issues that are related), raising the question: “How can one consume Big Data and transformit into actionable...

Università della Svizzera italiana

Lattice-based protocols for privacy

Boschini, Cecilia ; Wolf, Stefan (Dir.) ; Camenisch, Jan (Codir.)

Thèse de doctorat : Università della Svizzera italiana, 2020 ; 2020INFO002.

Privacy and control over data have become a public concern. Simultaneously, the increasing likelihood of the construction of a general purpose quantum computer has led companies and governments to demand for quantum safe alternatives to the protocols used today. New schemes have been elaborated, whose conjectured security against a quantum computer relies on the hardness to solve different...

Università della Svizzera italiana

Asset prices and demand shocks

Barbon, Andrea ; Franzoni, Francesco (Dir.)

Thèse de doctorat : Università della Svizzera italiana, 2020 ; 2020ECO002.

My dissertation consists of three chapters, each of which focuses on a different area of research in asset pricing. The first chapter deals with the informational role of brokerage firms during fire sales in the equity market. The second chapter exploits the ETF program by the bank of Japan as a quasi-natural experiment to measure the slope of the equity demand curve. The last chapter presents...

Université de Neuchâtel

Distributed systems and trusted execution environments : trade-offs and challenges

Pereira Pires, Rafael ; Felber, Pascal (Dir.) ; Pasin, Marcelo (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2019.

Security and privacy concerns in computer systems have grown in importance with the ubiquity of connected devices. Additionally, cloud computing boosts such distress as private data is stored and processed in multi-tenant infrastructure providers. In recent years, trusted execution environments (TEEs) have caught the attention of scientific and industry communities as they became largely...

Université de Fribourg

Ultrafast nonequilibrium evolution of excitonic modes in semiconductors

Murakami, Yuta ; Schüler, Michael ; Takayoshi, Shintaro ; Werner, Philipp

In: Physical Review B, 2020, vol. 101, no. 3, p. 035203

We study the time evolution of excitonic states after photoexcitation in the one- dimensional spinless extended Falicov-Kimball model. Several numerical methods are employed and benchmarked against each other: time-dependent mean-field simulations, the second-Born approximation (2BA) within the Kadanoff-Baym formalism, the generalized Kadanoff-Baym ansatz (GKBA) implemented with the 2BA, and...

Université de Fribourg

Spatial-numerical associations in 1st-graders: Evidence from a manual-pointing task

Möhring, Wenke ; Ishihara, Masami ; Curiger, Jacqueline ; Frick, Andrea

In: Psychological Research, 2019, vol. 83, p. 855-893

The current study investigated whether children’s mental representations of numbers are organized spatially at the onset of formal schooling using a manual-pointing task. First- graders (N = 77) saw four numbers (1, 3, 7, 9) presented randomly in four spatial positions (extreme left, left, right, extreme right) on a touch screen. In a Go/No-Go task, children were asked to press the appearing...