An Integrated Approach to Managing Change

Complex systems often involve a huge number of variables whose interdependence must be taken into account. This makes the adoption of an integrated approach essential for the proper management of a wide range of aspects related to human life, from social matters to the environment. In particular, this paper takes into consideration three different experiences in which the use of an integrated approach represented the most effective response for managing the evolving realities we took into consideration. We focused on the issue of land management, with particular attention to the problem of monoculture in Brazil. Then we analyzed the attempted cooperation between the States of the Aral Sea area for efficient water management of the basin and, finally, we dealt with the matter of energy efficiency and how the production of home integrated systems could lead to a better rationalization of energy consumption in the near future.      

Temporary Agency Workers in Italy: Alternative Techniques of Classification

Abstract. Cluster analysis and the classification tree technique are applied to investigate the relationship between the individual characteristics of Italian temporary help agency (THA) workers and their probability of achieving a temporary job. The application aims to show some advantages of these techniques with respect to traditional econometric tools. Sketches of the most common profiles among Italian THA workers are obtained as a result. Besides the typical THA worker pointed out by previous studies (young male workers, with a medium–high level of education, living in the Northern regions), two new profiles have been identified: the first comprising male manual workers with previous job experience, whose average age is over 30 and whose educational level is low; the second comprising young female workers with a medium–high level of education, working in the service sector or in the public sector. The results are compared with the more usual logit analysis and show their robustness.     

The Challenge for the Harmonization of Law

Under globalization and the rapid development of international trade and economic relationships, it is necessary to find common rules in private law. Nonetheless, an aspect that must be taken into account is that law is a mirror of a respective society and therefore it should also be considered that juridical fragmentation reflects these differences among societies. Hence, a ‘glocalized’ approach seems to be more suitable and, for it to be put it into practice, the efforts should be devoted to seeking legal harmonization instead of unification. The former, beside all the other things, is to be preferred in terms of feasibility. Harmonization does not equally show the same degree of difficulty in all the fields: it seems to be easier (and more urgent) to be achieved in obligations-contracts and commercial law than in family law or in property and real rights law. Considering this, our research, contains an overview on the advantages of legal harmonization and a brief survey on methods that have been employed and that are being employed now to reach this goal. Even at this preliminary stage, we have noticed that we should pay attention to a theoretical principles-based logic-systematic method and to the role played by jurists of reaching this goal.     

A two-phase sampling strategy for large-scale forest carbon budgets

The estimation of forest carbon sources and sinks is an important issue in forest inventories. For monitoring forest carbon budgets, a two-phase strategy is proposed. In the first phase, N points are thrown onto the study region by means of unaligned systematic sampling and then classified as forest or non-forest on the basis of aerial information. In the second phase, a sample of n points of those classified as forest is achieved by means of a sampling scheme with selection probabilities proportional to the sizes of an auxiliary variable. Subsequently, circular plots of adequate size are centred in the n selected points and visited in order to quantify the carbon amount within. Unbiased estimators of the forest area size as well as of the overall amount of carbon in that area and a conservative estimator of their variance–covariance matrix are derived. The strategy is applied to estimate carbon budgets in the forests of Trentino (North Italy).     

Another look into the effect of premarital cohabitation on duration of marriage: an approach based on matching

Summary.  The paper proposes an alternative approach to studying the effect of premarital cohabitation on subsequent duration of marriage on the basis of a strong ignorability assumption . The approach is called propensity score matching and consists of computing survival functions conditional on a function of observed variables (the propensity score), thus eliminating any selection that is derived from these variables. In this way, it is possible to identify a time varying effect of cohabitation without making any assumption either regarding its shape or the functional form of covariate effects. The output of the matching method is the difference between the survival functions of treated and untreated individuals at each time point. Results show that the cohabitation effect on duration of marriage is indeed time varying, being close to zero for the first 2–3 years and rising considerably in the following years.     

Immigration,religious diversity and recognition of differences: the Italian way to multiculturalism

Migration entails, among other consequences, the presence of different cultures and religions. Italy, being a latecomer among immigration countries, has had specific difficulties in acknowledging the new cultural and religious pluralism brought by migrations, due to lack of knowledge and reflection in this sphere. In the more recent context of social and cultural change in Europe, Italian society is also going through a phase characterised by reactive identities and cultural conflicts. They are producing a diffused anti-multiculturalist opinion, even though multiculturalist policies have not been openly implemented. Thus, on the one hand, this situation has so far prevented a real recognition of cultural and religious differences, particularly concerning Islam. But on the other hand, positive actions in favour of migrants can also be observed, especially at the local level.     

Examining the impact of social media on mood and body dissatisfaction using ecological momentary assessment

Abstract

Objective: To assess the effects of social media consumption on body dissatisfaction and negative affect using ecological momentary assessment, a method of assessment over time in the participants’ naturalistic environment. Participants: Woman college students (N?=?30) from a large public university participated in the study in Fall 2015. Methods: Participants were contacted via their smartphones five times per day for five days and asked to complete a battery of measures which assessed social media use, body dissatisfaction, and negative affect. Results: Results demonstrated that the number of social media sites visited was a significant predictor of body dissatisfaction while time spent using social media was not. The number of sites visited and time spent on social media were both significant predictors of general negative affect, sadness, and guilt. Conclusions: Results demonstrate the negative impact that social media use can have on body dissatisfaction and negative affect.     

Recoverable robust timetabling for single delay: Complexity and polynomial algorithms for special cases

In this paper, we study the problem of planning a timetable for passenger trains considering that possible delays might occur due to unpredictable circumstances. If a delay occurs, a timetable could not be able to manage it unless some extra time has been scheduled in advance. Delays might be managed in several ways and the usual objective function considered for such purpose is the minimization of the overall waiting time caused to passengers. We analyze the timetable planning problem in terms of the recoverable robustness model, where a timetable is said to be recoverable robust if it is able to absorb small delays by possibly applying given limited recovery capabilities. The quality of a robust timetable is measured by the price of robustness that is the ratio between the cost of the recoverable robust timetable and that of a non-robust optimal one.     

Diversity as width

It is argued that if a finite partially ordered population is given, and incomparability is taken as the relevant type of dissimilarity, then diversity comparisons between subpopulations may be conveniently based on widths namely on the maximum number of pairwise incomparable units they include. We introduce two width-based rankings. The first one is the plain width-ranking of subposets as induced by width computation. The second one is the undominated width-ranking of subposets namely the ranking induced by the sizes of undominated subposets. Simple axiomatic characterizations of the foregoing rankings are provided.