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Università della Svizzera italiana

On non-intrusive workload-aware database replication

Narváez, Vaide ; Pedone, Fernando (Dir.)

Thèse de doctorat : Università della Svizzera italiana, 2009 ; 2009INFO002.

Performance and high-availability are the crucial factors in the development of nowadays distributed database systems. Both of these challenges are commonly addressed by means of the same technique, database replication. The overall throughput of the system is increased by leveraging parallel computation on different sites, and in case of replica failures, availability is improved by...

Università della Svizzera italiana

Approximability of some classical graph and scheduling problems

Svensson, Ola Nils Anders ; Mastrolilli, Monaldo (Dir.)

Thèse de doctorat : Università della Svizzera italiana, 2009 ; 2009INFO003.

Approximation algorithms are motivated by the fact that for many important optimization problems we cannot hope to efficiently find an optimal solution (unless P=NP). Instead, we have to settle for second best — a solution that is close to being optimal. A natural question that arises is: how close to the optimal solution can one get with an efficient algorithm? The past two decades have...

Università della Svizzera italiana

Teaching networks how to learn : reinforcement learning for data dissemination in wireless sensor networks

Förster, Anna ; Murphy, Amy L. (Dir.)

Thèse de doctorat : Università della Svizzera italiana, 2009 ; 2009INFO001.

Wireless sensor networks (WSNs) are a fast developing research area with many new exciting applications arising, ranging from micro climate and environmental monitoring through health and structural monitoring to interplanetary communications. At the same time researchers have invested a lot of time and effort into developing high performance energy efficient and reliable communication protocols...

Università della Svizzera italiana

Of change and software

Robbes, Romain ; Lanza, Michele (Dir.)

Thèse de doctorat : Università della Svizzera italiana, 2008 ; 2008INFO004.

Software changes. Any long-lived software system has maintenance costs dominating its initial development costs as it is adapted to new or changing requirements. Systems on which such continuous changes are performed inevitably decay, making each maintenance task harder. This problem is not new: The software evolution research community has been tackling it for more than two decades. However,...

Università della Svizzera italiana

Imprecise probabilistic graphical models : Equivalent representations, inference algorithms and applications

Antonucci, Alessandro ; Zaffalon, Marco (Dir.)

Thèse de doctorat : Università della Svizzera italiana, 2008 ; 2008INFO003.

Credal networks are probabilistic graphical models that extend Bayesian nets to deal with imprecision in probability, and can actually be regarded as sets of Bayesian nets. Credal nets appear to be powerful means to represent and deal with many important and challenging problems in uncertain reasoning. The counterpart of having more freedom in the modeling phase is an increased inferential...

Università della Svizzera italiana

Motivating customers to develop and maintain a relationship with pharmacists : an application of a Stages of Change Model

Maniscalco, Chiara ; Brinberg, David (Dir.) ; Schulz, Peter (Codir.)

Thèse de doctorat : Università della Svizzera italiana, 2007 ; 2007COM005.

A consistent branch of research in health communication has been focused on the study of the pharmacist - patient relationship. In past decades, the pharmacist and his role in the health care setting has shifted from a product oriented approach, where the primary focus was the production and compound of medicines, to a more patient oriented approach, with main focus becoming the understanding and...

Università della Svizzera italiana

Web usability : enhancing effectiveness of methodologies and improving their communication features

Triacca, Luca ; Paolini, Paolo (Dir.)

Thèse de doctorat : Università della Svizzera italiana, 2005.

The quality of web sites (or more in general interactive applications) may be improved taking into account the activity of usability evaluation, in which the quality for the endusers is defined and established. One of the most serious problems related to usability field is that usability evaluation methods often were not defined to be effectively reused by the people who did not invent them. The...

Università della Svizzera italiana

TRAMA : a traceability analysis method for (interactive) applications

Randazzo, Giovanni ; Paolini, Paolo (Dir.)

Thèse de doctorat : Università della Svizzera italiana, 2005 ; 2005COM004.

A common opinion in the Requirements Traceability field is that solution design, i.e. the design of the application solutions, may be derived directly from requirements refinement; according to current industrial practices and to some specific experiences, this dissertation proposes a different thesis: the design process is not a fully rational and explicit sequence of actions; designers keep...

Università della Svizzera italiana

Mastering the semiotics of information-intensive web interfaces

Speroni, Marco ; Paolini, Paolo (Dir.)

Thèse de doctorat : Università della Svizzera italiana, 2006 ; 2006COM002.

Communication is virtually impossible when interlocutors lack the ability to negotiate meanings. The intended semantics of the language used by a sender should be perceived and mastered by its receiver/s. For this reason the sender should always vision and identify himself in the receiver in order to design the most clear and proper signs with respect to her/his knowledge. Web sites are complex...

Università della Svizzera italiana

Mastering the requirements analysis for communication-intensive websites = Gestione dell'analisi dei requisiti per la comunicazione su web

Bolchini, Davide ; Paolini, Paolo (Dir.)

Thèse de doctorat : Università della Svizzera italiana, 2003.

Lo sviluppo di applicazioni web necessita di strumenti efficaci per gestire alcuni aspetti essenziali del processo di analisi dei requisiti: l'identificazione di obiettivi di comunicazione strategici, la presenza di una varietà di profili utente e di stakeholders, le definizione di requisiti ipermediali (riguardanti navigazione, interazione, contenuto e presentazione), e il riuso dei requisiti...