A Note on “Sourcing Decisions with Stochastic Supplier Reliability and Stochastic Demand”

This note complements the study of Burke, Carillo, and Vakharia ( 2009 hereafter “BCV”) which analyzes a class of single‐product multisourcing problems under stochastic demand and random yields. The purpose is twofold. First, we prove that the objective function used by these authors is only a lower bound for the expected profit for which we provide the correct expression. Second, we show on some of the numerical instances provided in BCV's study that the structure and the performance of the BCV ordering policy may be substantially different from the optimal ordering policy. We conclude by giving general qualitative insights characterizing suboptimality of the BCV solution.     

Constrained egalitarianism in a simple redistributive model

The paper extends a result in Dutta and Ray's (1989) theory of constrained egalitarianism initiated by relying on the concept of proportionate rather than absolute equality. We apply this framework to redistributive systems in which what the individuals get depends on what they receive or pay qua members of generally overlapping groups. We solve the constrained equalization problem for this class of models. The paper ends up comparing our solution with the alternative solution based on the Shapley value, which has been recommended in some distributive applications.     

Bootstrapping the renewal spacings processes

We define the generalized bootstrapped version of the empirical and quantile renewal spacing processes. We show that the asymptotic theory of the renewal spacings processes holds for the bootstrap version.     

Ecological and Motivational Determinants of Activation: Studying Compared to Sports and Watching TV

How can we enhance activation? Studying shouldbe a challenging, yet rewarding activity forstudents who intend to graduate. The Flowtheory (Csikszentmihalyi, 1990, 1997) predictsthat differential levels of perceived challengeand skill (flow) are related to optimizedmental states and increased activation.However, the influence of concurrent mentalstates and specific environmental cues for thisstate of optimal experience is unknown. In thisstudy we explore the contextual and subjectivedeterminants of flow in relation to activationin studying, and compare this with sports andwatching TV or listening to the radio. Method: 43 undergraduate students at theUniversity of Maastricht were assessed with theExperience Sampling Method for one week(Delespaul, 1995). At random moments 10 timeseach day subjects evaluated the social context,activities, and mood states. Analyses were donewith multilevel random regression techniques.Results: We replicated the predictedflow-related patterns in activation andemotions. While overall activation wasincreased in high challenging moments(β = 0.51; 95% CI: 0.36, 0.19), thiseffect was less pronounced during study(β = ?0.16; 95% CI: ?0.25, ?0.07). Skillslevels did not affect activation(β = ?0.01; 95% CI: ?0.06, 0.05).Concurrent emotions were independently andadditionally related to activation(Δχ² ₍₄₎ = 117.12,p < 0.0001). Unexpectedly, activation increasedwith demotivation (β = ?0.12; 95% CI:0.16, 0.07). We found highly significant andadditional effects of context for all theactivities (study: χ² = 732.63;p < 0.0001; R² = 0.30; active leisure:χ² = 753.40; p < 0.0001; R² = 0.31;and passive leisure: χ² = 555.86;p < 0.0001; R² = 0.24). Conclusions. TheFlow theory is a valuable model leading topredictions of optimal experience as well asactivation. However, the dynamics of activityengagement are more complex and related toconcurrent emotions and context. In the Dutchstudent culture, escaping boredom or compulsoryduties seems to drive individuals more thanpursuing flow.     

La division sexuelle du travail chez les musiciens français

Data from a survey of French musicians conducted for the Ministry of Culture are used to analyze the processes producing inequality between men and women in music. Two models of a sexual division of labor coexist along with a differentiation depending on the style (learned vs. popular music). These two models closely link together working conditions, careers and the organization of home life for male and female musicians; and they underlie the construction of musicians', identities. In the world of popular music, bodily stereotypes of femininity (youth, seduction) and masculinity (the aestheticization of deviance, the bohemian life) dominate. In the world of learned music, a hierarchical model of masculine authority prevails with the figure of the conductor at the summit.     

Effects of Career Counseling on French Adults: An Experimental Study

This research project is focused on theoretical and empirical works analyzing the effects of career counseling. This experimental and longitudinal study has been carried out in France; it compares a sample of individuals having undertaken competence assessment with a control group and deals with self‐esteem, self‐analysis, self‐concept, and the participants' situations. The results correspond to the authors' main hypotheses: The effect size calculated for all the variables (+0.62) is similar to the one observed in the meta‐analyses concerning the same topic. The stability of effects has also been demonstrated for 2 out of 3 categories of variables (effect size +0.44) in spite of a slight decrease in the production of self‐concept. Finally, treatment intensity seems to have a lesser effect than the one expected, but it strengthens its role in the development of self‐analysis. The discussion focuses on the prospects for counseling practice assessment, as well as theoretical directions meriting future development.     

Une Dialectique Des Migrations : Acculturation Et Transition Démographique

It is argued that two types of migration have tended to follow each other. One is a ‘colonizing’ migration corresponding to a technical, military and economic advantage of one group over another, associated at first with a demographic surge in the first group; the other is a ‘social-capillarity’ migration occurring when the first, ‘colonizing’ group has completed its demographic transition and the second has barely started. Two hypotheses concerning the outcome of this process are presented. The first — optimistic — hypothesis of economic advance in the second group, implies a return to demographic equilibrium. The second hypothesis is a catastrophic one, the implications of which are hard to predict. Finally, the need for a specific co-operative effort is underlined.