An Integrated Approach to Select Key Quality Indicators in Transit Services

Social Indicators Research - Recent interests in transit services have captured attention of experts on the monitoring of public transport quality. Previous research focused on relevant models and...     

Stochastic Measures of Network Resilience: Applications to Waterway Commodity Flows

Given the ubiquitous nature of infrastructure networks in today's society, there is a global need to understand, quantify, and plan for the resilience of these networks to disruptions. This work defines network resilience along dimensions of reliability, vulnerability, survivability, and recoverability, and quantifies network resilience as a function of component and network performance. The treatment of vulnerability and recoverability as random variables leads to stochastic measures of resilience, including time to total system restoration, time to full system service resilience, and time to a specific α% resilience. Ultimately, a means to optimize network resilience strategies is discussed, primarily through an adaption of the Copeland Score for nonparametric stochastic ranking. The measures of resilience and optimization techniques are applied to inland waterway networks, an important mode in the larger multimodal transportation network upon which we rely for the flow of commodities. We provide a case study analyzing and planning for the resilience of commodity flows along the Mississippi River Navigation System to illustrate the usefulness of the proposed metrics.     

Stages and modes of incorporation of exiles in Switzerland: The example of Chilean refugees

Many scholars perceive the incorporation of refugees and immigrants to a new society as a matter of time: the longer the length of residence, the more the refugees and immigrants perceive their stay in the host society as permanent. Other social scientists go even much further: they perceive adaptation not only as a linear process but also as an inevitable and desirable process which should lead to the disappearance of immigrants as an ethnic community and to their assimilation to a new society. In this paper we argue that incorporation to a new society is not necessarily a linear process depending exclusively upon length of residence. We also argue that assimilation is not necessarily the end result of this process. In our opinion, linear and assimilationist approaches neglect macro‐social context and, to a lesser extent, social stratification which are important variables influencing the incorporation process of migrants to a new society. The empirical study of Chilean refugees in Switzerland shows the relevance of these factors and also of the actor's own perception of the situation in the definition of different stages of exile.     

Risk aversion,downside risk aversion,and the transition to entrepreneurship

In this paper, we discuss the transition from secure employment to risky self-employment (entrepreneurship) caused by a small increase in wealth. Building on the apportioning risk literature, we prove that the transition from secure employment to risky entrepreneurship is based on a measure of the difference between the strength of downside risk aversion and the strength of risk aversion. This result highlights the idea that using the behavioral approach of risky lotteries to study entrepreneurship can produce different results from the traditional economic theory of entrepreneurship, which can have policy implications that must be considered with caution.

     

The relationship between job insecurity and accident under-reporting: A test in two countries

Although the problem of accident under-reporting is increasingly recognized in the literature, less is known regarding work environment variables that predict the severity of such under-reporting. Data on perceived job insecurity and on the numbers of both accidents that were experienced and accidents that were actually reported over a period of one year were obtained from 786 employees in 24 US organizations and 563 employees in 20 Italian organizations in sectors where safety is highly relevant. Analysis of these data suggested that not only is job insecurity related to the likelihood of experiencing an accident, but also perceptions of job insecurity may serve to inhibit the reporting of accidents to appropriate company officials. Overall, the rate of accidents was lower in Italy than the United States. Moreover, in both countries, when job insecurity was low, there was little difference between the total number of experienced accidents and the number that employees reported. However, as job insecurity increased, the under-reporting of accidents increased. The implications of these results are discussed in light of the globally increasing prevalence of job insecurity in today's workplace.     

Restabilizing attachment to cultural objects. Aesthetics,emotions and biography

The scholarship on aesthetics and materiality has studied how objects help shape identity, social action and subjectivity. Objects, as ‘equipment[s] for living’ (Luhmann 2000), become the ‘obligatory passage points humans have to contend with in order to pursue their projects (Latour 1991). They provide patterns to which bodies can unconsciously latch onto, or help human agents work towards particular states of being (DeNora 2000, 2003). Objects are central in the long term process of taste construction, as any attachment to an object is made out of a delicate equilibrium of mediators, bodies, situations and techniques (Hennion and his collaborators (Hennion and Fouquet 2001; Hennion and Gomart 1999). In all of these accounts objects are the end result of long‐term processes of stabilization, in which the actual material object (a musical piece, a sculpture, an art installation, a glass of wine, the oeuvre of Bach as we know it) is both a result and yet a key co‐producer of its own generation. Whereas the literature has been generous and detailed in exploring the processes of assembling and sustaining object‐centered attachments, it has not sufficiently engaged with what happens when the aesthetic elements of cultural artifacts that have produced emotional resonance are transformed: what do these artifacts morph into? What explains the transition (or not) of different cultural objects? And relatedly, what happens to the key aesthetic qualities that were so central to how the objects had been defined, and to those who have emotionally attached to them? To answer these questions, this article uses as exemplars two different cases of attachment, predicated on the distinctive features of a cultural object – the transcendence of opera and the authenticity of a soccer jersey – that have undergone transformations.     

A test of concordance based on Gini’s mean difference

A new rank correlation index, which can be used to measure the extent of concordance or discordance between two rankings, is proposed. This index is based on Gini’s mean difference computed on the totals ranks corresponding to each unit and it turns out to be a special case of a more general measure of the agreement of m rankings. The proposed index can be used in a test for the independence of two criteria used to rank the units of a sample, against their concordance/discordance. It can then be regarded as a competitor of other classical methods, such as Kendall’s tau. The exact distribution of the proposed test-statistic under the null hypothesis of independence is studied and its expectation and variance are determined; moreover, the asymptotic distribution of the test-statistic is derived. Finally, the implementation of the proposed test and its performance are discussed. Both the authors contributed equally to this work; however, the actual writing of the paper was as follows: Sects. 2 and 3 are due to C. G. Borroni, Sects. 1 and 4 are due to M. Zenga.     

A monte carlo analysis of two spectral tests of the martingale hypothesis

Summary The size, power, and robustness properties of the Kolmogorov-Smirnov and Cramér-von Mises spectral tests of the martingale (difference) hypothesis are investigated by Monte Carlo methods. The results highlight a marked superiority of the Cramér-von Mises with respect to the Kolmogorov-Smirnov test. The paper also shows that the Cramér-von Mises test is simple to compute, more general and more powerful than other converntionally used tests.