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Università della Svizzera italiana

Agent communication and institutional reality

Fornara, Nicoletta ; Viganò, Francesco ; Colombetti, Marco

In this paper we propose to regard an Agent Communication Language (ACL) as a set of conventions to act on a fragment of institutional reality, defined in the context of an artificial institution. Within such an approach, we first reformulate a previously proposed commitment-based semantics for ACLs. In particular we show that all commonly used types of communicative acts can be defined in terms...

Università della Svizzera italiana

An operational approach to norms in artificial institutions

Viganò, Francesco ; Fornara, Nicoletta ; Colombetti, Marco

The notion of artificial institution is crucial for the specification of open and dynamic interaction frameworks where heterogeneous and autonomous agents can interact to face problems in various fields, like for instance electronic commerce, business-to-business (B2B) applications, and personal assistant applications. In our view the specification of artificial institutions requires a clear...

Università della Svizzera italiana

Artificial institutions : a model of institutional reality for open multiagent systems

Fornara, Nicoletta ; Viganò, Francesco ; Verdicchio, Mario ; Colombetti, Marco

Software agents’ ability to interact within different open systems, designed by different groups, presupposes an agreement on an unambiguous definition of a set of concepts, used to describe the context of the interaction and the communication language the agents can use. Agents’ interactions ought to allow for reliable expectations on the possible evolution of the system; however, in open...

Università della Svizzera italiana

A scenario generation algorithm for multistage stochastic programming : application for asset allocation models with derivatives

Laurent, Alessandro ; Barone Adesi, Giovanni (Dir.) ; Audrino, Francesco (Codir.)

Thèse de doctorat : Università della Svizzera italiana, 2006 ; 2006ECO001.

Modern financial portfolio management problems as well as asset/liability problems use stochastic optimization to allocate financial assets. To implement and solve such a stochastic optimization based portfolio allocation problem, we require scenario trees for the description of the future market evolutions of every random variable present in the model. This thesis proposes a general algorithm to...

Università della Svizzera italiana

Regional public health care spending in Switzerland : an empirical analysis

Crivelli, Luca ; Filippini, Massimo

In this study we attempt to explain variations across the Swiss regional states (cantons) in public health care expenditures. The large autonomy of the cantons in the organization and financing of health care services creates strong heterogeneity. Per capita public expenditures in health care are assumed to depend on the median tax share, intergovernmental grants, and some structural factors. The...

Università della Svizzera italiana

A statistical analysis of pain relief after surgical operations

Farsi, Mehdi ; Gitto, Lara

Adequate and timely application of analgesics after surgical operations is important from both clinical and economic perspectives. Administering pain relief measures requires information about development of post-operative pain and the effect of analgesics. Such information can be obtained from studying patients’ perception of pain in different periods after the operation. This paper applies an...

Università della Svizzera italiana

Estimating the out-of-hospital mortality rate using patient discharge data

Farsi, Mehdi ; Ridder, Geert

This paper is a case study of the use of public use administrative data for the estimation of empirical relations when key dependent variables are not available in the data. It is shown that the out-of-hospital mortality rates can be identified using the patient discharge data without post-discharge death records. Using data on the lengths of hospitalizations and out-of-hospital spells, the...

Università della Svizzera italiana

An empirical analysis of child care demand in Switzerland

Banfi, Silvia ; Farsi, Mehdi ; Filippini, Massimo

This paper analyses the demand of Swiss families for child care facilities. A choice experiment has been used to study the effects of the facilities’ characteristics as well as socioeconomic factors on the selected child care mode. The experimental data have been analysed using a discrete choice model with multinomial logit specification. The results suggest that the stated demand for...

Università della Svizzera italiana

Health care expenditure and decentralization : a national and international empirical analysis for OECD countries

Mosca, Ilaria ; Filippini, Massimo (Dir.) ; Meneguzzo, Marco (Codir.) ; Crivelli, Luca (Codir.)

Thèse de doctorat : Università della Svizzera italiana, 2005 ; 2005ECO002.

The consistent rise in health care expenditure in these last years has attracted a lot of attention by academics, policy makers, and politicians. The quota of GDP spent on health has become considerably high in many OECD countries and pundits searched for possible solutions to increase the efficiency of the health care sector and to contain waste. Decentralization has been perceived as a solution...

Università della Svizzera italiana

The ecology of risk taking

Degeorge, François ; Moselle, Boaz ; Zeckhauser, Richard

In: Journal of Risk and Uncertainty, 2004, vol. 28, p. 195-228

We analyze the risk level chosen by agents who have private information regarding their quality. We show that even risk-neutral agents will choose risk strategically to enhance their reputation in the market, and that such choices will be influenced by the mix of other agents’ types. Assuming that the market has no strong prior about whether the agents are good or bad, good agents will choose...