Optimal replacement strategies in network infrastructures under quality penalties

As a consequence of liberalization, electric utilities have developed different asset management strategies with the aim of reducing total maintenance costs by prolonging replacement cycles. A cost-minimizing network operator has to optimize the trade-off between costs for early replacement and quality penalties he faces in the case of outages (due to a resulting higher number of failures). The basic purpose of this paper is to identify the optimal decisions for a network operator under output-based quality regulation and to determine the main drivers for his decisions. In order to derive general insights, an analytical framework is chosen for this paper. This work builds on the foundations of optimal maintenance and replacement strategies as developed across Operations Research, Production Economics and Engineering Production Theory. As main results we are able to analytically derive optimal replacement strategies for network components depending on the characteristics of their failure distributions linked to the equipment’s cost, respective replacement cost, and quality penalties.     

The satisfied poor

Positive life satisfaction in poverty represents in well-being research the so called satisfaction-paradox. In poverty studies the state of being satisfied with a life in poverty has been explained by either shiftlessness of the people expressing it or by conscious decision of the individual for a poverty life. This article in contrast develops a constructive explanation to the problem in order to create the possibility for intervention and thus reduction of the social and material costs for society and strain to the poverty stricken individual. A theoretical framework is developed that integrates the theory of learned helplessness (Seligman, 1978), the theory of cognitive dissonance (Festinger, 1975) and the subjective quality of life models (Campbell, Converse and Rodgers, 1976). The interpretation shows new ways how to avoid the existence of the satisfaction paradox at least in a part of the concerned individuals and hence opens the possibility to increase overall well-being in the society.     

The recalled childhood gender questionnaire‐revised: A psychometric analysis in a sample of women with congenital adrenal hyperplasia

We administered the 18‐item Recalled Childhood Gender Questionnaire‐Revised (RCGQ‐R), female version, to 147 adult women with congenital adrenal hyperplasia (CAH) representing three different degrees of prenatal androgenization due to 21‐hydroxylase deficiency and to non‐CAH controls. A principal components analysis generated 3 components accounting for 46%, 9%, and 6% of the variance, respectively. Corresponding unit‐weighted scales (high scores = feminine) were labeled Gender Role (13 items; Cronbach α = .91), Physical Activity (3 items; a = .64), and Cross‐Gender Desire (2 items; α = .47). Discriminant validity was demonstrated in terms of highly significant comparisons across the 4 groups. We concluded that the first 2 RCGQ‐R scales show good psychometric qualities, but that the third scale needs to be evaluated further in a sample that includes women with gender identity disorder.     

Trunk stabilization with sling training in osteoporosis patients—a randomized clinical trial

Fractures due to osteoporosis are one of the principal causes of functional limitations, chronic pain, and greater morbidity in advanced age. In addition to bone risk factors for osteoporotic fractures include extraosseous causes such as falls or reduced neuromuscular capacity. Muscle and coordination exercises enhance the patients’ abilities in daily life and prevent falls. In view of recent conclusions drawn from competitive sports, which stress the significance of the muscles of the trunk in respect of reducing back pain and optimizing posture, we used sling exercises to determine whether osteoporosis patients benefit from it and whether it is more advantageous than traditional physiotherapy. Fifty patients were randomized into two groups. Group A received traditional physiotherapy, while group B was given sling exercises, in each case twice a week for a period of 3 months. The results of treatment (pre-post) were analyzed in terms of pain levels, mobility, trunk strength, and the shape of the back. After a further 3 months with no specific exercise treatment, we retested all patients in order to draw conclusions about the long-term effects of the two types of exercise. Forty-four patients (88 %) completed the study. Patients were assigned to small groups (a maximum of five patients in each group) and, thus, received individual attention and motivation. Positive training effects were achieved in both groups. Significantly better results as regards improvement of mobility and reduction of falls were registered in the sling exercise group.     

Paternal Child Care and Relationship Quality: A Longitudinal Analysis of Reciprocal Associations

This study explored reciprocal associations between paternal child‐care involvement and relationship quality by following British couples from the birth of a child until he or she reached school age. It extends the literature by distinguishing between paternal engagement in absolute terms and relative to the mother and by considering relationship quality reports of mothers and fathers and family breakdown. The analysis was based on the British Millennium Cohort Study, a representative survey of children born in 2000 and 2001 and their parents (N = 5,624 couples). The author applied ordinary least squares regression analysis with lagged dependent variables and event history modeling. Fathers' relative child‐care share was positively associated with mothers' relationship satisfaction, whereas fathers' absolute child‐care frequency was positively related to their own perceived relationship quality for most time periods. Fathers' relative and absolute child‐care contributions were positively associated with relationship stability over the preschool years. Greater perceived relationship quality of mothers, but not fathers, was associated with more frequent paternal engagement.     

Public Child‐Care Expansion and Changing Gender Ideologies of Parents in Germany

This study investigates whether the expansion of public child care for children aged younger than 3 years in Germany has been associated with individual‐level change in gender ideologies. The authors develop and test a theoretical framework of the short‐term impact of family policy institutions on ideology change. The analysis links the German Family Panel pairfam (2008 to 2015) with administrative records on county‐level child‐care provision for those aged younger than 3 years and applies fixed effects panel models. The findings show that the child‐care expansion has been associated with moderate changes toward less‐traditional gender ideologies only among mothers in West Germany and mostly among mothers without a college degree. In East Germany, the authors found evidence of more traditional gender ideologies among mothers without a college degree as the child‐care reform unfolded. The results provide evidence that policy reforms may alter gender ideologies also in the short‐term.