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Università della Svizzera italiana

High performance selected inversion methods for sparse matrices : direct and stochastic approaches to selected inversion

Verbosio, Fabio ; Schenk, Olaf (Dir.)

Thèse de doctorat : Università della Svizzera italiana, 2019 ; 2019INFO002.

The explicit evaluation of selected entries of the inverse of a given sparse matrix is an important process in various application fields and is gaining visibility in recent years. While a standard inversion process would require the computation of the whole inverse who is, in general, a dense matrix, state-of-the-art solvers perform a selected inversion process instead. Such approach allows...

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...

Public access from Jan 15, 2021
Università della Svizzera italiana

Modelling protein-protein interactions to elucidate molecular mechanisms behind neurodegenerative diseases

Grasso, Gianvito ; Krause, Rolf (Dir.) ; Danani, Andrea (Codir.)

Thèse de doctorat : Università della Svizzera italiana, 2018 ; 2018INFO017.

The worldwide significant increase in life expectancy has recently drawn the attention of the scientific community to neurodegenerative pathologies of the elderly population. These neurodegenerative disorders arise from the abnormal protein aggregation in the nervous tissue leading to intracellular inclusions or extracellular aggregates in specific brain areas. A feasible strategy to prevent...

Università della Svizzera italiana

Exposing concurrency failures : a comprehensive survey of the state of the art and a novel approach to reproduce field failures

Bianchi, Francesco Adalberto ; Pezzè, Mauro (Dir.)

Thèse de doctorat : Università della Svizzera italiana, 2018 ; 2018INFO015.

With the rapid advance of multi-core and distributed architectures, concurrent systems are becoming more and more popular. Concurrent systems are extremely hard to develop and validate, as their overall behavior depends on the non-deterministic interleaving of the execution flows that comprise the system. Wrong and unexpected interleavings may lead to concurrency faults that are extremely...

Università della Svizzera italiana

Tracking public opinion on social media

Giachanou, Anastasia ; Crestani, Fabio (Dir.)

Thèse de doctorat : Università della Svizzera italiana, 2018 ; 2018INFO016.

The increasing popularity of social media has changed the web from a static repository of information into a dynamic forum with continuously changing information. Social media platforms has given the capability to people expressing and sharing their thoughts and opinions on the web in a very simple way. The so-called User Generated Content is a good source of users opinion and mining it can be...

Università della Svizzera italiana

Reification as the key to augmenting software development : an object is worth a thousand words

Dal Sasso, Tommaso ; Lanza, Michele (Dir.)

Thèse de doctorat : Università della Svizzera italiana, 2018 ; 2018INFO014.

Software development has become more and more pervasive, with influence in almost every human activity. To be able to fit in so many different scenarios and constantly implement new features, software developers adopted methodologies with tight development cycles, sometimes with more than one release per day. With the constant growth of modern software projects and the consequent expansion...

Université de Neuchâtel

Multimodal information retrieval

Geiger, Melanie ; Savoy, Jacques (Dir.) ; Braschler, Martin (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2018.

Knowledge-intensive business processes, one of the essential drivers of our economy today, often rely on multimodal information retrieval systems that have to deal with increasingly complex document collections and queries. The complexity mainly evolves due to a large and diverse range of textual and non-textual modalities such as geographical coordinates, ratings and timestamps used in the...

Università della Svizzera italiana

ASQ : active learning with interactive web presentations and classroom analytics

Triglianos, Vasileios ; Pautasso, Cesare (Dir.)

Thèse de doctorat : Università della Svizzera italiana, 2018 ; 2018INFO013.

Today it is commonly accepted that the effectiveness of instructional technology, measured as improvement over the learning outcomes of students, is highly correlated with the learning environment, the applied pedagogies and the goals of the participants of the learning process. The often applied passive lecture model and the undirected use of modern technology such as student laptops and...

Université de Neuchâtel

Practical erasure codes for storage systems : the study of entanglement codes, an approach that propagates redundancy to increase reliability and performance

Estrada Galiñanes, Verónica del Carmen ; Felber, Pascal (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2017.

This dissertation deals with the design of practical erasure codes for storage systems. Hardware and logical disk failures are a common source of system failures that may lead to data loss. Nevertheless, it is predicted that spinning disks would remain the standard storage medium in large datacenters. Cloud storage needs efficient codes to become reliable despite its low-cost components. As...

Università della Svizzera italiana

Time aware location recommendations in location based social networks

Mudda, Steven ; Giordano, Silvia (Dir.)

Thèse de doctorat : Università della Svizzera italiana, 2018 ; 2018INFO012.

Smartphones have fundamentally changed how people make choices about the products and services they consume and the way they interact with each other. The spread and extensive usage of mobile applications has led to the rise of Location-based Social Network (LBSN) services like Foursquare, Yelp etc, that aim to aim to provide new and novel places of interest to people based on their interests...