Classic Paxos is a round-based distributed consensus algorithm. Normally, proposals are sent to the round leader and decided in two communication steps more. Fast Paxos extends Classic Paxos by allowing also fast rounds, in which a decision can be learned in two communication steps without relying on a leader but requiring bigger quorums. We extend Fast Paxos and allow yet another sort of round...
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In this paper, we study the atomic multicast problem, a fundamental abstraction for building faulttolerant systems. In the atomic multicast problem, the system is divided into non-empty and disjoint groups of processes. Multicast messages may be addressed to any subset of groups, each message possibly being multicast to a different subset. Several papers previously studied this problem either in...
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In this paper we investigate correctness criteria for replicated databases from the client's perspective and present their uniform characterization. We further study the effects of different consistency degrees in the context of three middleware-based replication protocols: primarybackup, optimistic update-everywhere and BaseCON, a simple yet faulttolerant middleware-based replication protocol...
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The goal of change prediction is to help developers by recommending program entities that will have to be changed alongside the entities currently being changed. To evaluate their accuracy, current change prediction approaches use data from versioning systems such as CVS or Subversion. However, as these data sources are not very accurate, they do not provide a valid basis for an objective...
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The regulation on prescribing and dispensing of antibiotics has a double purpose: to enhance access to antibiotic treatment and to reduce the inappropriate use of drugs. Nevertheless, incentives to dispensing physicians may lead to ine¢ ciencies. We sketch a theoretical model of the market for antibiotic treatment and empirically investigate the impact of self-dispensing on the per capita...
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Thèse de doctorat : Università della Svizzera italiana, 2008 ; 2008ECO003.
"Why are there so many kinds of organizations?" (Hannan and Freeman, 1977: 936). As Astley (1985) suggests, "[t]his question focuses inquiry on organizational diversity, the differentiation of organizations into varying population types" (p. 224). Out of the different literature streams, which have addressed the topic of organizational diversity, an effective explanation of the dynamics...
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Thèse de doctorat : Università della Svizzera italiana, 2008 ; 2008ECO001.
The present PhD Thesis aims to better understand and improve the long- run survival of family firms. It is composed of four articles: the first two focus on knowledge integration and accumulation; the last two, rather, concentrate on business exit and regeneration. The research conducted reveals that family firms eager to survive across generations need to accumulate and integrate knowledge...
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In: Journal of Productivity Analysis, 2008, p. -
This paper uses a mixed effects model to examine the temporal variation of cost efficiency in Switzerland’s general hospitals. The variations in total costs, the number of empty beds and the length of hospital stays are analyzed using financial data from a sample of 168 hospitals operating from 1998 to 2003, as well as hospitalization records disaggregated to Diagnosis Related Groups....
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Thèse de doctorat : Università della Svizzera italiana, 2004 ; 2004COM04.
La tesi di dottorato propone la ricostruzione, l’analisi e la contestualizzazione storica del programma televisivo “Un’ora per voi”, destinato a favorire l’integrazione dei lavoratori italiani e delle loro famiglie in Svizzera nel periodo compreso tra l’inizio degli anni 60 e la fine degli anni 80 del Novecento. Nell’ambito degli studi sulla storia della televisione, la tesi si...
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