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Search Results: 1 - 10 of 22361 matches for " Roberto Battiti "
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A Telescopic Binary Learning Machine for Training Neural Networks
Mauro Brunato,Roberto Battiti
Computer Science , 2015,
Abstract: This paper proposes a new algorithm based on multi-scale stochastic local search with binary representation for training neural networks. In particular, we study the effects of neighborhood evaluation strategies, the effect of the number of bits per weight and that of the maximum weight range used for mapping binary strings to real values. Following this preliminary investigation, we propose a telescopic multi-scale version of local search where the number of bits is increased in an adaptive manner, leading to a faster search and to local minima of better quality. An analysis related to adapting the number of bits in a dynamic way is also presented. The control on the number of bits, which happens in a natural manner in the proposed method, is effective to increase the generalization performance. Benchmark tasks include a highly non-linear artificial problem, a control problem requiring either feed-forward or recurrent architectures for feedback control, and challenging real-world tasks in different application domains. The results demonstrate the effectiveness of the proposed method.
Learning Modulo Theories for preference elicitation in hybrid domains
Paolo Campigotto,Roberto Battiti,Andrea Passerini
Computer Science , 2015,
Abstract: This paper introduces CLEO, a novel preference elicitation algorithm capable of recommending complex objects in hybrid domains, characterized by both discrete and continuous attributes and constraints defined over them. The algorithm assumes minimal initial information, i.e., a set of catalog attributes, and defines decisional features as logic formulae combining Boolean and algebraic constraints over the attributes. The (unknown) utility of the decision maker (DM) is modelled as a weighted combination of features. CLEO iteratively alternates a preference elicitation step, where pairs of candidate solutions are selected based on the current utility model, and a refinement step where the utility is refined by incorporating the feedback received. The elicitation step leverages a Max-SMT solver to return optimal hybrid solutions according to the current utility model. The refinement step is implemented as learning to rank, and a sparsifying norm is used to favour the selection of few informative features in the combinatorial space of candidate decisional features. CLEO is the first preference elicitation algorithm capable of dealing with hybrid domains, thanks to the use of Max-SMT technology, while retaining uncertainty in the DM utility and noisy feedback. Experimental results on complex recommendation tasks show the ability of CLEO to quickly focus towards optimal solutions, as well as its capacity to recover from suboptimal initial choices. While no competitors exist in the hybrid setting, CLEO outperforms a state-of-the-art Bayesian preference elicitation algorithm when applied to a purely discrete task.
El arte ante las paradojas de la representación
Cuadernos del Centro de Estudios en Dise?±o y Comunicaci?3n. Ensayos , 2012,
Abstract: in argentina there are a bunch of institutions that conceive contemporary art as the core of their agenda when it comes to outline memorial politics that have, among it's priorities, the transmition of the events of the last military government to the next generations. so is the case of parque de la memoria-monumento a las víctimas del terrorismo de estado en la argentina, a project that was proposed in 1998 by human rights representatives and developed in conjuction with the ciudad autonoma de buenos aires government and the buenos aires university. from it's beginnings, the project includes a group of works that came out of an open international contest that took place in 1999. in this work we will try to go deep in the causes that motivated the creators of the project to choose contemporary art as a tool in the development of the social trauma that was caused during said military government, to analyze the questionings and policies that exist around the esthetic of traumatic events and lastly, to go deep in the strategies that some of the sculptural projects utilize for the better function of the memory call, not as a persistent remembering, but as a constructive part of the present.
Integer Programming Formulations for Maximum Lifetime Broadcasting Problems in Wireless Sensor Networks  [PDF]
Roberto Montemanni
Wireless Sensor Network (WSN) , 2010, DOI: 10.4236/wsn.2010.212111
Abstract: Approaches based on integer linear programming have been recently proposed for topology optimization in wireless sensor networks. They are, however, based on over-theoretical, unrealistic models. Our aim is to show that it is possible to accommodate realistic models for energy consumption and communication protocols into integer linear programming. We analyze the maximum lifetime broadcasting topology problem and we present realistic models that are also shown to provide efficient and practical solving tools. We present a strategy to substantially speed up the convergence of the solving process of our algorithm. This strategy introduces a practical drawback, however, in the characteristics of the optimal solutions retrieved. A method to overcome this drawback is discussed. Computational experiments are reported.
Innovation in the Financial Sector: Persistence and Schumpeterian Hypotheses  [PDF]
Roberto Napoli
Journal of Service Science and Management (JSSM) , 2008, DOI: 10.4236/jssm.2008.13023
Abstract: The paper analyses innovation features in the German financial sector. The first topic is persistence of innovation. Our research question is: Do innovators plan further innovation for the subsequent year? In addition, since the sector is so far poorly researched, very basic questions are investigated in the paper: the relationship between firm size and innovation (both linear and quadratic), as well as the impact of market structure on innovation (i.e. Schumpeterian and neo-Schumpeterian hypotheses). Finally, Suttons argument of R & D sunk costs is investigated as a possible explanation for persistence. Basing on the CIS IV survey, our empirical evidence is consistent with the results of similar researches carried out in different sectors.
Development, Poverty and Energy, in the 21st Century  [PDF]
Roberto Kozulj
Modern Economy (ME) , 2011, DOI: 10.4236/me.2011.24054
Abstract: This work explores the area of global interdependences and the global context. In particular it deals with interdependences that seem to be absent from current literature but could be of great significance to identify the biggest challenges that the economy and the energy sector will have to face in the next two or three decades. In that sense, several issues are addressed: the dynamics of economic growth and its future; the relation between these dynamics and the foreseeable importance that urban poverty is to have at a global scale; the lack and inadequacy of information to approach crucial interdependences; and the need for a change in institutions and thinking habits to analyze the future. The approach focuses on the complex relationships that link urbanization, development phases, and technological changes dependent on products with shorter life cycles, discussing the impact of this kind of process over the genesis of urban poverty and over the structural modifications of economy. At the same time, a view on how these interdependences will become a serious and increasingly complex challenge for the energy sector and long term global sustainability is presented. The author also emphasizes the fact that these interdependences will become a serious and increasingly complex challenge that the energy sector will have to face if long term sustainability is to be attained.
Lethe@-Udr1 Passenger Sedan Final Proposed Configuration  [PDF]
Roberto Capata
Journal of Transportation Technologies (JTTs) , 2011, DOI: 10.4236/jtts.2011.14011
Abstract: For years the interest of the UDR1 researcher group has been focused on the development of a Hybrid Series (HS) vehicle, different from the standard one, using a Gas Turbine (GT) set as a thermal engine. The reason of this choice resides in the opportunity to reduce weight and dimension, in comparison to a traditional In- ternal Combustion Engine (ICE). It’s not possible to use the GT engine directly for the vehicle traction, so the UDR1 HS configuration shows the GT set connected with the electric generator only. The result is that the traction is pure electric. Many efforts are spent in the definition of a generic scientific method to define the correct ratio HD (the Hybridization Degree) between the installed power of the battery pack and that of the GT electric generator which simultaneously guarantee the main life for the battery package and the ca- pacity of the vehicle to complete a common mission (about 15 km - 30 km) without lack of energy or stop. This paper reports all studies carried out and finally proposes a possible configuration (weight distribution, VMU logic control, GT dimensions and power rate, battery package characteristics and so on) for mid term solution in the Italian transport system.
Design Method Based on Normalized Functions for a Toroidal Inductor Applied to Power-Quality Evaluation  [PDF]
Roberto Baca
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.53020

The design method for a low-cost toroidal inductor is proposed as an alternative to power-quality evaluation. The method is based on well-known tools by the engineers in which is presented the relationships that exist between equivalent circuit and transfer function of a toroidal inductor. The proposed design method has been explained with normalized functions based on physical parameters of a toroidal inductor. This work presents the main arguments of the suggested methodology and as demonstration of the design method as function of normalized parameters, is developed a current-signal sensor which has been validated in the laboratory by the EN-50160-2-2 standard to evaluate the power quality in home use loads.

Dynamic Reflections on Constitutional Justice  [PDF]
Roberto Scarciglia
Beijing Law Review (BLR) , 2014, DOI: 10.4236/blr.2014.52012

This article attempts to propose critical reflections on “historical” models of Constitutional Review. The gradual depletion of the simplified classification system of constitutional review has been identified, by some scholars, as a failure of the bipolar American-European model. This means that it is necessary to rethink the approach to analysing constitutional review, in light of legal traditions, positive law within legal systems, and comparative methodologies. Consequently, judicial review could be studied according to the internal perspectives of the Supreme and Constitutional Courts’ decision-making processes, rather than externally observable legal characteristics. As of recently, legal studies have been converging with other sciences, such as cognitive science. They have been considering the relationship between consciousness and comparison, and even the field of cognitive errors in judgment, and the development of decisions taken by Courts.

Comparative Methodology and Pluralism in Legal Comparison in a Global Age  [PDF]
Roberto Scarciglia
Beijing Law Review (BLR) , 2015, DOI: 10.4236/blr.2015.61006
Abstract: This article grew to look deeper into the relationship between different methodological tools in comparative law enquiries. There are several factors that currently affect these enquiries, such as the emergence of new spheres of normativity and transnational actors determining a new configuration of the relationship between centre and periphery. Different forms and visions of legal pluralism could characterise a cultural tradition and different ways, in which existing nations, which have a pluralistic legal system, interact. Furthermore, one might add the consideration that the presence of different forms of pluralism—a pluralism of pluralisms—implies a constant and urgent need to reconsider the adequacy of the methodologies in comparative law. Hence, we can use different approaches because there are different purposes that the comparison pursues. Though the horizontal comparison is certainly a widespread tendency for comparative analyses, from a methodological point of view, we need to consider the importance of forms of vertical comparison, both a top-down and bottom-up approach.
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