Complexity of determining the most vital elements for the p-median and p-center location problems

We consider the k most vital edges (nodes) and min edge (node) blocker versions of the p-median and p-center location problems. Given a weighted connected graph with distances on edges and weights on nodes, the k most vital edges (nodes) p-median (respectively p-center) problem consists of finding a subset of k edges (nodes) whose removal from the graph leads to an optimal solution for the p-median (respectively p-center) problem with the largest total weighted distance (respectively maximum weighted distance). The complementary problem, min edge (node) blocker p-median (respectively p-center), consists of removing a subset of edges (nodes) of minimum cardinality such that an optimal solution for the p-median (respectively p-center) problem has a total weighted distance (respectively a maximum weighted distance) at least as large as a specified threshold. We show that k most vital edges p-median and k most vital edges p-center are NP-hard to approximate within a factor $\frac{7}{5}-\epsilon$ and $\frac{4}{3}-\epsilon$ respectively, for any ?>0, while k most vital nodes p-median and k most vital nodes p-center are NP-hard to approximate within a factor $\frac{3}{2}-\epsilon$ , for any ?>0. We also show that the complementary versions of these four problems are NP-hard to approximate within a factor 1.36.     

Locking down adolescents: Victims,irresponsible subjects,or just social actors

The article presents the results of a qualitative study investigating the experiences of a sample of Italian adolescents during the COVID-19 pandemic. Data were analysed in the light of the two social representations (adolescents as criminals and as victims) that permeated the Italian public debate throughout the outbreak. The findings showed the ability of boys and girls in dealing with the relationships altered by the pandemic constraints and in adapting to different regulations. This demonstrated their competence as social actors, neither criminals nor victims, who were also able to cope with the coronavirus risk in safeguarding their significant others.     

A Ecological Model of Well-Being in Child Welfare Referred Children

Despite its social, political and economic relevance, child well-being remains a challenging construct to define and measure accurately. This holds true especially for children growing up in at-risk families, where their development is hindered by many adverse circumstances. Typically, the well-being of child welfare (CW) referred children has been conceptualized as the absence of negative outcomes, and the study of its determinants has been limited to children’s micro-systems. In this study, we aimed to obtain a suitable indicator of child well-being and to test a model of the determinants of CW referred children’s well-being including parental, family and wider contextual variables. The sample included 249 parents and 46 case managers from Portuguese and Spanish CW services. A three-domain solution from selected items of the Child Well-Being Scales (Physical, Academic and Socioemotional) was tested and confirmed through Confirmatory Factor Analysis. The results of structural equation modeling for each domain revealed that risk factors nested in the wider context and those related to material disadvantage were the most powerful predictors of physical well-being, while parenting and family functioning variables predicted better both academic and socio-emotional well-being. Our findings suggest that different risk and protective factors matter for different outcomes and that most of these factors are associated with each other. Therefore, interventions with at-risk children must take this specificity into account when targeting each domain of well-being, and efforts could be allocated to a few modifiable dimensions, which would in turn positively affect other parental and family factors.     

Assessing ‘empowerment’ as social development: goal and process

ABSTRACT

Empowerment is a concept widely used in several policy documents and is presented, in social work and social care professional universes, as an operative process to reduce vulnerability and to increase the power, or capabilities, of individuals and groups to make choices and to transform these into actions and results. However, to move beyond rhetoric and paternalistic practices, we need to understand what empowerment really means and implies in different contexts, and especially, how to evaluate what has changed (outcomes) or is changing (processes), both on an individual and a collective level.     

Organizational Wellbeing in CSOs in Morelos (Mexico): Findings from a Qualitative Study

In recent years, civil society organizations (CSOs) have become a significant aspect of Mexican reality given the number of people involved in them and their contribution to the services sector. These entities are organizations where voluntary and paid workers may experience wellbeing conditions that are inherent in empowerment processes, feelings of usefulness, and the satisfaction associated with participating in decision-making. At the same time, contradictory dynamics related to governance, power relations, leadership, and decision-making may be activated in CSOs and create uncertainty and psychosocial malaise. In this research, based on a grounded theory approach, 11 interviews and 89 questionnaires were realized in 14 service-providing CSOs in the Mexican State of Morelos, highlighting the wellbeing/malaise dimensions and psychosocial factors that are relevant for their members.     

Calibrating Time-Use Estimates for the British Household Panel Survey

This paper proposes an innovative statistical matching method to combine the advantages of large national surveys and time diary data. We use data from two UK datasets that share stylised time-use information, crucial for the matching process. In particular, time-diary information of an individual from the Home On-line Study, our donor data set, is imputed to a similar individual from the British Household Panel Survey, our recipient dataset. Propensity score methods are used in conjunction with Mahalanobis matching to increase matching quality.     

Which Aspects of Elderly Living Conditions are Important to Predict Mortality? The Complex Role of Family Ties at Home and in Institutions

Social Indicators Research - Besides health and socio-economic status, the social relationships maintained during elderly play an important role in shaping the living conditions at older ages. In...     

Intermediate Units in Multinational Corporations: Advancing Theory on their Co‐parenting Role,Dynamics and Outcomes

Due to the dispersion of headquarters’ activities across organizational and geographical boundaries, intermediate units (IUs) are emerging as a key actor in international business. These units are intermediate structural layers between headquarters (HQ) and local subsidiaries with specific HQ responsibilities. Through a systematic review of 68 studies published between 1996 and 2020, we develop a conceptual framework that integrates complementary streams of theoretical and empirical research with IUs as the focal unit of analysis. Our aims are to disentangle how the main theories in this field address the antecedents of IU creation, and explain the dynamism in the roles and functions of IUs and their outcomes. We also propose a conceptualization of IUs as co‐parents in a dynamic system in which parenting functions are shared by IUs and headquarters. Finally, we highlight avenues for future research, emphasizing opportunities to advance the understanding of IUs using different theoretical lenses that may help scholars position their work within the broader stream of literature.     

Decision process of allocating projects to project managers

Allocating projects to project managers (PM) is a crucial decision in project management. Choosing the PM must be undertaken in a structured way, and thereby take into account the needs of the project and the PM’s competences and availability. The proposed model optimises the total time that PMs have available and takes into account the constraint of the switchover time loss within the mathematical programming. It model is part of a three-stage approach where: (1) projects are sorted using a multicriteria approach; (2) PMs are sorted using a multicriteria approach; and (3) the final allocation to intra-classes of projects is made using the optimisation model. This proposal contributes to aiding decision-makers involved in allocating projects: by respecting the limit of the time that PMs have available, or by extrapolating PMs’ available hours in which case overtime will have to be used. The model is applied in a Brazilian Energy Company.     

Immigrant Transnational Organizations and Development: A Comparative Study1

This article explores how ninety Colombian, Dominican, and Mexican transnational immigrant organizations pursue philanthropic projects that aid in the development of their country or community of origin. We find that each nationality's context of exit and reception affects the origin, strength, and character of their organizations. We produce “maps” of the interaction of transnational organizations with each country of origin and conduct multivariate regressions to establish determinants of key organizational characteristics, including their degree of formalization and form of creation. Generally, Colombian organizations assume more middle‐class forms, Dominican organizations stem largely from politics in the country of origin, and Mexican organizations are primarily hometown associations with greater involvement of the national state. We observe that regardless of nationality, transnational immigrant organizations’ members are older, better‐established, and possess above‐average levels of education, suggesting that participation in transnational activities and assimilation are not incompatible. The character of proactive activities by each national state are examined. Theoretical implications for immigrant adaptation and community/national development are discussed.