Traffic Partition in WDM/SONET Rings to Minimize SONET ADMs

SONET (Synchronous Optical NETworks) add-drop multiplexers (ADMs) are the dominant cost factor in the WDM(Wavelength Division Multiplexing)/SONET rings. The number of SONET ADMs required by a set of traffic streams is determined by the routing and wavelength assignment of the traffic streams. Previous works took as input the traffic streams with routings given a priori and developed various heuristics for wavelength assignment to minimize the SONET ADM costs. However, little was known about the performance guarantees of these heuristics. This paper contributes mainly in two aspects. First, in addition to the traffic streams with pre-specified routing, this paper also studies minimizing the ADM requirement by traffic streams without given routings, a problem which is shown to be NP-hard. Several heuristics for integrated routing and wavelength assignment are proposed to minimize the SONET ADM costs. Second, the approximation ratios of those heuristics for wavelength assignment only and those heuristics for integrated routing and wavelength assignment are analyzed. The new Preprocessed Iterative Matching heuristic has the best approximation ratio: at most 3/2.     

The Ambiguity of Return Migration: Prolonged Crisis and Uncertainty in the Life Strategies of Young Romanian and Latvian Returnees

Drawing on qualitative research, this study endeavours to identify the determinants of return migration of young Romanians and Latvians in light of the most recent global economic crisis (GEC). The decision-making patterns of young returnees are examined by three main research questions. How do macro-events, such as the GEC, interfere with individual biographies creating specific return experiences? What can we say about the “crisis returnees”, their migration motivations and re-adaptation in the origin country? What are the main challenges of young adults facing life strategies in such uncertain periods? Data are drawn from 51 in-depth interviews with Romanian and Latvian young adults, carried out in late 2015 and early 2016. Findings show that return migration is associated with economic conditions, family life, feelings of homesickness, and re-adaptation experiences. Our results also confirm that youth transitions and migration have become more diversified and complex in the context of the economic crisis.     

Romanian social workers facing the challenges of neo-liberalism

ABSTRACT

With a history of almost 90 years, professional social work in Romania once flourished up until World War II. The Communist Party disbanded the profession in 1968 and it was reinstated after the fall of the Iron Curtain in 1989. Within the context of the socio-economic transition from a centralised to a free-market economy, Romanian social policy and social work have evolved from a Marxist/socialist-type ideology, one that advocates for state intervention, to a libertarian/neo-liberal-type ideology, which promotes both state withdrawal from welfare provision and individuals taking responsibility for their own welfare. These two trends continue to co-exist subject to sometimes divergent forces such as international institutions and internal Romanian social pressures. Using a qualitative approach, we explore how Romanian social workers are adapting to the neo-liberal realities and identify three types of perceived challenges: 1. those related to regulation, 2. linked with collaboration in social work activity and 3. those related to the social worker-client relationship. Under neo-liberal pressures, the social worker's role of agent of social change becomes marginalised in daily practice, leaving little power to influence agency policies that negatively impact clients.     

Embracing the Paradox of Interorganizational Value Co‐creation–Value Capture: A Literature Review towards Paradox Resolution

This study reviews literature on paradoxical tensions between value co‐creation and capture in interorganizational relationships (IORs). The purpose of this review is to make a re‐evaluation of the literature by engaging a paradox theory lens, thereby identifying factors that render tensions salient and factors that lead to virtuous or vicious cycles. This review of 143 articles reveals factors that make tensions salient: these relate to plurality (e.g. coopetition), scarcity (e.g. lack of experience with IORs), change (e.g. changes in collaboration scope) or combinations thereof (e.g. IORs in weak appropriability regimes). Results also uncover factors that resolve paradoxical tensions of value co‐creation and capture, thus spurring virtuous cycles (e.g. carefully mixing trust and contracts), as well as factors that promote vicious cycles, owing to the emphasis on either value co‐creation or capture (e.g. myopia of learning). This review further reveals a new category of factors that may stimulate either virtuous or vicious cycles, depending on the extent to which they are enforced. This finding expands the value co‐creation–capture paradox resolution and brings to light new dynamics in the paradox framework of dynamic equilibrium. This study thus contributes by: (1) reassessing the existing literature and applying paradox theory to the well‐known hazard of value co‐creation and capture; (2) highlighting factors that amplify paradoxical tensions related to this hazard; and (3) outlining factors that help solve the paradox by embracing its contradictory poles and factors that hinder paradox resolution by emphasizing either value co‐creation or appropriation.     

Talking Turkey: Effects of Family Discussions About the 2016 Election over the Thanksgiving Holiday

Four hundred and seventy-nine undergraduates reported on family discussions about the 2016 election that occurred over that same year’s Thanksgiving break. Family Communication Patterns Theory was used to predict the perceived outcomes of such discussion on family members. Higher conversation orientation predicted a more positive perceived effect of political talk on family closeness. Perceived similarity of political views partially moderated the relationship between conformity orientation and perceived effect of political talk on family closeness. Reported stress levels since the election were negatively predicted by the perceived (positive) effect of political talk on family closeness. Practical and theoretical implications for families and political socialization processes are discussed.     

1.61-approximation for min-power strong connectivity with two power levels

Given a directed simple graph \(G=(V,E)\) and a cost function \(c:E \rightarrow R_+\), the power of a vertex \(u\) in a directed spanning subgraph \(H\) is given by \(p_H(u) = \max _{uv \in E(H)} c(uv)\), and corresponds to the energy consumption required for wireless node \(u\) to transmit to all nodes \(v\) with \(uv \in E(H)\). The power of \(H\) is given by \(p(H) = \sum _{u \in V} p_H(u)\). Power Assignment seeks to minimize \(p(H)\) while \(H\) satisfies some connectivity constraint. In this paper, we assume \(E\) is bidirected (for every directed edge \(e \in E\), the opposite edge exists and has the same cost), while \(H\) is required to be strongly connected. Moreover, we assume \(c:E \rightarrow \{A,B\}\), where \(0 \le A < B\). We improve the best known approximation ratio from 1.75 (Chen et al. IEEE GLOBECOM 2005) to \(\pi ^2/6 - 1/36 + \epsilon \le 1.61\) using an adaptation of the algorithm developed by Khuller et al. [SIAM J Comput 24(4):859–872 1995, Discr Appl Math 69(3):281–289 1996] for (unweighted) Minimum Strongly Connected Subgraph.     

Who is bullying whom in ethnically diverse primary schools? Exploring links between bullying,ethnicity, and ethnic diversity in Dutch primary schools

This study investigated associations between ethnicity, ethnic diversity, and bullying among 739 pupils enrolled in their last year of primary school. Hypotheses derived from social misfit and inter-ethnic relations theories were tested using the multilevel p₂ model. Our key findings were: (1) inter- and intra-ethnic bullying are just as common in ethnically heterogeneous as in homogeneous classes; (2) pupils belonging to the Turkish and Moroccan minority groups bully significantly more than native Dutch (in particular according to victims); the chance to be victimized does not depend on the ethnic background of the pupil; (3) the prevalence of inter- and intra-ethnic bullying depends on the level of ethnic diversity in the class; inter-ethnic and intra-ethnic bullying increase with increasing levels of ethnic diversity.     

Juvenile delinquency in Romania: a comparison between minors in prisons and re-education services

This article assesses the relationships between the individual and family characteristics of minors and juvenile delinquency in Romania. This cross-sectional study involved Romanian delinquent minors, 285 of whom were incarcerated in prisons in Romania and 280 subject to educational measures in re-education services in Romania. The multivariate logistic regression analysis showed that delinquency in incarcerated minors is associated with age, the offence committed, drug use, school dropout rates, recidivism, family alcoholism, the relationship with the biological parents, and the number of biological siblings. The study provides baseline data to identify at-risk minors in order to develop prevention programmes. We have adopted a public health approach to analysing delinquency and targets risk factors.     

Convergence of compensators of simple point processes

Processes are viewed as random variables with values in the space of càdlàg functions endowed with the J₁ topology. For a sequence of point processes with their minimal filtration, the convergence of their compensators is studied. It is shown that convergence in probability of the processes and of the corresponding conditional distributions of their jump times implies, with some additional hypothesis, the convergence in probability of the compensators. The result is then applied to convergence to a quasi-left-continuous point process with independent increments.