Clustering of electrical transmission systems based on network topology and stability

A proper understanding and modelling of the behaviour of heavily loaded large-scale electrical transmission systems is essential for a secure and uninterrupted operation. In this paper, we present methods to cluster electrical power networks based on different criteria into regions. These regions are useful for the efficient modelling of large transcontinental electricity networks, switching operation decisions or placement of redundant parts of the monitoring and control system. In alternating current electricity networks, power oscillations are normal, but they can become dangerous if they build up. The first approach uses the correlation between results of a stability assessment for these oscillations at every node for the cluster criterion. The second method concentrates on the network topology and uses spectral clustering on the network graph to create clusters where all nodes are interconnected. In this work, we also discuss the problem how to choose the right number of clusters and how the discussed clustering methods can be used for an efficient modelling of large electricity networks or in protection and control systems.     

Multi-professional vocational rehabilitation group meetings with female clients: a qualitative study

Many women require vocational rehabilitation before they can return to work. The objective with the present study was to describe female clients' situation during the rehabilitation process, as it became apparent during the rehabilitation meetings with the various actors involved. The clients' diagnoses varied, but the majority was affected with musculoskeletal disorders. The meetings were audio-taped and transcribed verbatim, after which they were analysed by qualitative content analysis. The following themes emerged: Adaptation to the rehabilitation group; client's health status; the workplace's significance for rehabilitation; and the client's decision-point. Conflict between health and work was immensely important for rehabilitation. Differences in attitude were apparent during the rehabilitation meetings, as some clients were passive and exercised less influence on the planning, than the other more active clients did.     

A new model for vocational rehabilitation at an organizational level -- a pilot study with promising results

Sick leave has negative economic consequences for companies. The aim of this study was to implement the model Organizational Rehabilitation in two departments at an industrial company in the county of J?mtland, Sweden, to see if it was possible to reduce the costs due to sick leave. The rehabilitation model consisted of three steps and combined economy and productivity with a good psychosocial work environment, measuring the result in costs. Step 1 consisted of a problem inventory among all co-workers, step 2 semi structured interviews with all co-workers regarding how they experience their work environment and step 3 individual agreements regarding rehabilitation interventions, i.e. interventions where the individual's specific needs and wishes outlined the foundation for rehabilitation measures with the objective of increasing work capacity. The costs were measured at the start and end of the project. The study showed that it is indeed possible to reduce both sick leave and costs. During the study, the organization reduced current sick leave from 12% (2003) to 3% (Nov. 2004) and the costs per employee from euro1 860 per month (2003) to euro440 per month (Nov. 2004). This will make an estimated saving for 2005 of euro470 000. It should be noted that the study is small and should not be generalized, but may be seen as a positive indication regarding the model organizational rehabilitation. Further research is needed.     

The role of social work in the context of social disintegration and violence

Violence and the violence discourse are very similar from country to country: focus on youth, preponderance of males among perpetrators and victims, disproportionate involvement of migrants and indigenous people, greater prevalence with socioeconomic disadvantage and low education, and the impact of underlying factors such as political disintegration, exclusion from the consumer lifestyle, and inadequacies of social institutions. In social disintegration theory, the basic explanatory backdrop is the dynamic relationship of integration and disintegration between and within the different spheres: individual and functional system integration, integration into society, and integration into the community. (Relative) exclusion from work, consumption, and democratic processes combined with experience of socioemotional deficits seem to give a particularly strong boost to socially unacceptable forms of particularist integration and to favor collective and individual acceptance of violence. When subjects draw balances of personal recognition and of the achieved and achievable scope to organize their life, the latter orientations appear subjectively more likely to meet their expectations than socially (more) accepted modes of behavior.The central conclusion on social reactions to violence in general and professional social work in particular is that rather than relying on admonishment, punishment, or curative measures, or some combination of these, to combat violence, there is a need for wide-ranging long-term options for those acutely affected and at risk to have the long-term scope to organize their own lives-to experience life control, recognized integration, and development of competences. Those who experience being the organizer of their own life have no need of violence as a form of self-assertion.     

Level and change of group-focused enmity in Germany: unconditional and conditional latent growth curve models with four panel waves

In this study, we investigate and explain the level and change of six elements of group-focused enmity (GFE; see Zick et al. in J. Soc. Issues 64(2):363–383, 2008) in Germany between 2002 and 2006: racism, xenophobia, anti-Semitism, homophobia, exclusion of homeless people and support for rights of the established. For the data analysis, a representative 4-year panel study of the adult non-immigrant German population collected during the years 2002–2006 is used, and the development of each GFE component is tested by using an unconditional second-order latent growth curve model (LGM) (with full information maximum likelihood, FIML). We find that the level of 5 of the 6 components (racism, xenophobia, anti-Semitism, homophobia, exclusion of homeless people) displays an increase at the beginning of the observed period followed by a decrease. However, the sixth aspect, rights of the established, displays a continuous linear increase over time. The different developmental pattern stands in contrast to Allport’s (The nature of prejudice. Perseus Books, Cambridge, 1954) hypothesis for the strong link between the components and their development over time. We try to explain this different developmental pattern by several sociodemographic characteristics. This is performed by using a conditional second-order latent growth curve model.     

Grundrechtsschutz durch Verfahrensgestaltung: Verfassungs- und völkerrechtliche Vorgaben für die Durchführung kindschaftsrechtlicher Verfahren

Articles 6 II 2 and 2 I of the German Constitution require the Federal Republic of Germany to create procedural rules guaranteeing the fundamental rights of children. The same message may also be derived not only from Art. 6 I, but also from Art. 8 I of the European Convention on Human Rights. This is exemplified by judgements dealing with duration of proceedings, fair trial and execution of orders made by the Court.     

THE MARRIED WIDOW: MARRIAGE PENALTIES MATTER!

Marriage penalties are a controversial feature of many government policies. Empirical evidence of their behavioral effects is quite mixed, which is surprising because economic theory predicts that they should have an impact on the headship decision. We investigate the removal of marriage penalties from the surviving spouse pensions of the Canadian public pension system in the 1980s. These reforms provide a simple and transparent source of identification. Our results indicate that marriage penalties can have large and persistent effects on marriage decisions. We also present evidence suggesting that it is individuals with characteristics correlated with greater wealth who respond to the penalties. (JEL: J1, H2)