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Università della Svizzera italiana

Scaling blockchains

Fynn, Enrique ; Pedone, Fernando (Dir.)

Thèse de doctorat : Università della Svizzera italiana, 2021 ; 2021INFO003.

Blockchains are a new type of state machine replication that have raised interesting challenges. A replicated state machine (RSM) is a well-established approach to building fault-tolerant systems. Because each replica needs to execute the same set of instructions to transition through the same state changes, adding more replicas does not translate directly to an increase in performance. On top...

Université de Fribourg

Rapid genomic and phenotypic change in response to climate warming in a widespread plant invader

Sun, Yan ; Bossdorf, Oliver ; Grados, Ramon D. ; Liao, Zhi, Yong ; Müller‐Schärer, Heinz

In: Global Change Biology, 2020//n/a/-

Predicting plant distributions under climate change is constrained by our limited understanding of potential rapid adaptive evolution. In an experimental evolution study with the invasive common ragweed (Ambrosia artemisiifolia L.) we subjected replicated populations of the same initial genetic composition to simulated climate warming. Pooled DNA sequencing of parental and offspring...

Università della Svizzera italiana

On the many faces of atomic multicast

Coelho, Paulo ; Pedone, Fernando (Dir.)

Thèse de doctorat : Università della Svizzera italiana, 2019 ; 2019INFO004.

Many current online services need to serve clients distributed across geographic areas. Coordinating highly available and scalable geographically distributed replicas, however, is challenging. While State Machine Replication is the most direct way of achieving availability, no scalability comes from the traditional approach. Typically, scalability is obtained by partitioning the original...

Consortium of Swiss Academic Libraries

Martingale optimal transport and robust hedging in continuous time

Dolinsky, Yan ; Soner, H.

In: Probability Theory and Related Fields, 2014, vol. 160, no. 1-2, p. 391-427

Université de Neuchâtel

Erasure coding for distributed storage systems

Barbi, Roberta ; Mercier, Hughes (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2019.

A huge quantity of data is generated and stored every day. Preeminent examples are the 300 million photos that get uploaded daily to Facebook or the 156 million emails sent every minute. Furthermore, it is remarkable that almost 90% of the data in the world has been generated in the last 2 years. This humongous quantity of data is typically hosted in data centres located in different geographic...

Université de Fribourg

Développement de la mémoire de travail et aide au maintien du but : Investigation du rôle joué par l'indiçage du but dans le fonctionnement de la mémoire de travail verbale chez les enfants de 4 à 9 ans

Fitamen, Christophe ; Camos, Valérie (Dir.)

Thèse de doctorat : Université de Fribourg, 2019.

Crucial in learning, especially academic learning, working memory develops with age during childhood. This thesis aims to broaden our knowledge of working memory functioning development between the preschool period and the school period. Previous studies have shown that goal neglect contributed to kindergarteners’ poor executive control. Hence, presenting goal cues during a task improves...

Université de Fribourg

Aging and Its Demographic Measurement

Bronikowski, Anne M. ; Flatt, Thomas

In: Nature Education Knowledge, 2010, vol. 1, no. 12, p. 1-6

This case study highlights the general issues raised earlier. First, that maximum lifespan is not an easily obtainable metric. Specifically, it is unambiguous in the sense that once the last animal dies, it is most definitely dead. But to estimate the variance in maximum lifespan, many replicate populations would need to be followed for each treatment group (with each replicate providing a single...

Università della Svizzera italiana

Consensus protocols exploiting network programmability

Dang, Huynh Tu ; Soulé, Robert (Dir.) ; Pedone, Fernando (Codir.)

Thèse de doctorat : Università della Svizzera italiana, 2019 ; 2019INFO003.

Services rely on replication mechanisms to be available at all time. The service demanding high availability is replicated on a set of machines called replicas. To maintain the consistency of replicas, a consensus protocol such as Paxos or Raft is used to synchronize the replicas' state. As a result, failures of a minority of replicas will not affect the service as other non-faulty replicas...

Université de Neuchâtel

On reducing latency in geo-distributed systems through state partitioning and caching

Halalai, Raluca ; Felber, Pascal (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2018.

Modern distributed systems are increasingly large, spanning many datacenters from different geographic regions. The end goal of such systems is to provide services to their users with high availability and good performance. This thesis proposes approaches to reduce the access latency perceived by end users. First, we focus on systems that rely on the state machine replication approach in...

Haute école de gestion de Genève

La croissance de la gestion indicielle : la fin du marché ?

Borel, Maxime ; Zuchuat, Christophe (Dir.)

Mémoire de bachelor : Haute école de gestion de Genève, 2018 ; TDEE 355.

La gestion indicielle consiste à répliquer, physiquement ou synthétiquement, un indice de marché et de laisser évoluer ce panier sans modifier les pondérations. Il existe de nombreuses méthodes de pondération, mais les indices actuels ont pour critère le flottant des capitalisations boursières des actifs le composant. Dès lors, les fonds de réplication, simple de construction, ont les...