Fast Discrete Consensus Based on Gossip for Makespan Minimization in Networked Systems

In this paper we propose a novel algorithm to solve the discrete consensus problem, i.e., the problem of distributing evenly a set of tokens of arbitrary weight among the nodes of a networked system. Tokens are tasks to be executed by the nodes and the proposed distributed algorithm minimizes monotonically the makespan of the assigned tasks. The algorithm is based on gossip-like asynchronous local interactions between the nodes. The convergence time of the proposed algorithm is superior with respect to the state of the art of discrete and quantized consensus by at least a factor O(n) in both theoretical and empirical comparisons

FDI inflows in Europe: Does investment promotion work?

Can active investment promotion efforts attract FDI towards areas and sectors that would not otherwise be targeted? This paper leverages an ad hoc survey on national and sub-national Investment Promotion Agencies (IPAs) in Europe and applies state-of-the-art policy evaluation methods to estimate the impact of IPAs on FDI attraction. The results show that FDI responds to IPAs even in advanced economies. Sub-national IPAs, operating in closer proximity to investors' operations, attract FDI in particular towards less developed areas where market and institutional failures are stronger. IPAs influence FDI over and above other policies targeting the general economic improvement of the host economies. Impacts are concentrated in knowledge-intensive sectors where collaborative systemic conditions are more relevant. IPAs work best for less experienced companies - ‘occasional’ investors - more likely to suffer from institutional failures. Finally, IPAs are equally effective in attracting companies from both outside and inside the EU Single Market even if the latter are less likely to suffer from regulatory or information asymmetries. Overall, this evidence sheds new light on the role of sub-national IPAs as local ‘institutional plumbers’ in support of foreign investors and their operations

Dynamic max-consensus with local self-tuning

This work describes a novel control protocol for multi-agent systems to solve the dynamic max-consensus problem. In this problem, each agent has access to an external timevarying scalar signal and has the objective to estimate and track the maximum among all these signals by exploiting only local communications. The main strength of the proposed protocol is that it is able to self-tune its internal parameters in order to achieve an arbitrary small steady-state error without significantly affecting the convergence time. We employ the proposed protocol in the context of distributed graph parameter estimations, such as size, diameter, and radius, and provide simulations in the scenario of open multi-agent systems. Copyright (C) 2022 The Authors

Safety-oriented Testing for High-speed Rail Onboard Equipment Using Petri Nets

With its ability to operate at high speeds and capacity, high-speed rail offers a fast, dependable, and ecofriendly urban transportation option. Safety-critical systems such as high-speed rail signaling systems must be tested regularly to assess compliance with specifications and ensure reliable performance. Given that the onboard equipment is the core component of the signaling system, conducting safety testing on this equipment is of utmost importance. Current methods of analyzing test requirements mainly rely on human interpretation of specifications. However, the official technical specifications usually only outline standard operational scenarios, which could result in an inefficient and unclear safety analysis. This paper focuses on safety-oriented testing for onboard equipment. In particular, we propose a Petri net based approach to generate test cases for diverse operational scenarios. This approach improves both the efficiency and reliability of the testing process while ensuring compliance with safety requirements

Youth geographies of everyday life. Methodological notes from a project of photographic storytelling in Fez

The paper presents some methodological notes on a fieldwork in Fez, Morocco. The research involved a group of pupils from two schools belonging to different districts and culminated in the realization of two workshops of “photographic storytelling”. The aim was to verify if and how the everyday lives of the “pupil-inhabitants” had been affected by the urban projects underway in the neighbourhoods. The images and tales by the young students bring to light hidden and invisible geographies which go beyond the simple documentation of the uses, representations or emotions that link young people and space, and reveal a much more significant upshot on the political nature of socio-spatial organization and of urban transformations

Supervisor Synthesis for Discrete Event Systems under Partial Observation and Arbitrary Forbidden State Specifications

In this paper, we consider the forbidden state problem in discrete event systems modeled by partially observed and partially controlled Petri nets. Assuming that the reverse net of the uncontrollable subnet of the Petri net is structurally bounded, we compute a set of weakly forbidden markings from which forbidden markings can be reached by firing a sequence of uncontrollable/unobservable transitions. We then use reduced consistent markings to represent the set of consistent markings for Petri nets with structurally bounded unobservable subnets. We determine the control policy by checking if the firing of a certain controllable transition will lead to a subsequent reduced consistent marking that belongs to the set of weakly forbidden markings; if so, we disable the corresponding controllable transition. This approach is shown to be minimally restrictive in the sense that it only disables behavior that can potentially lead to a forbidden marking. The setting in this paper generalizes previous work by studying supervisory control for partially observed and partially controlled Petri nets with a general labeling function and a finite number of arbitrary forbidden states. In contrast, most previous work focuses on either labeling functions that assign a unique label to each observable transition or forbidden states that are represented using linear inequalities. More importantly, we demonstrate that, in general, the separation between observation and control (as considered in previous work) may not hold in our setting

Robust reconstruction of the discrete state for a class of nonlinear uncertain switched systems

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Dermatitis in community pharmacies: a survey on italian pharmacists’ management and implications on corticophobia

Community pharmacists represent an important resource for the promotion of a safer and more effective self-management of common skin diseases, as well as the provision of educational support on therapies prescribed by clinicians, ultimately improving patients’ adherence. In this study, a semi-structured survey was administered to 154 Italian community pharmacists, in order to acquire information on their counseling activity on dermatological disorders. Collected data provide an overview on the frequency and methodology of counseling offered in Italian community pharmacies, identifying knowledge gaps and misbeliefs. In particular, an overall negative opinion on topical corticosteroid therapy emerged among pharmacists, unveiling a phenomenon previously described as corticophobia. Starting from this observation, we discuss the risks for patients’ adherence, associated with corticophobia among pharmacists. Lastly, we briefly report on the main tools desired by pharmacists to improve their education on dermatology, envisioning their implementation with the aim of a more effective counseling

Indoor/Outdoor Air Quality Assessment at School near the Steel Plant in Taranto (Italy)

This study aims to investigate the air quality in primary school placed in district of Taranto (south of Italy), an area of high environmental risk because of closeness between large industrial complex and urban settlement. The chemical characterization of PM2.5 was performed to identify origin of pollutants detected inside school and the comparison between indoor and outdoor levels of PAHs and metals allowed evaluating intrusion of outdoor pollutants or the existence of specific indoor sources. The results showed that the indoor and outdoor levels of PM2.5, BaP, Cd, Ni, As, and Pb never exceeded the target values issued by World Health Organization (WHO). Nevertheless, high metals and PAHs concentrations were detected especially when school were downwind to the steel plant. TheI/Oratio showed the impact of outdoor pollutants, especially of industrial markers as Fe, Mn, Zn, and Pb, on indoor air quality. This result was confirmed by values of diagnostic ratio as B(a)P/B(g)P, IP/(IP + BgP), BaP/Chry, and BaP/(BaP + Chry), which showed range characteristics of coke and coal combustion. However, Ni and As showedI/Oratio of 2.5 and 1.4, respectively, suggesting the presence of indoor sources