Quantum Channels and Simultaneous ID Coding

This paper is on identification of classical information by the use of quantum channels. We focus on simultaneous ID codes which use measurements being useful to identify an arbitrary message. We give a direct and a converse part of the appropriate coding theorem.Comment: 15 page

La prédiction de la délinquance

The paper presents the results of a meta-analysis to analyze which predictors of delinquency in males and females are consistently evident from longitudinal studies, and how the predictors compare in their predictive efficiency. The results show that a variety of conduct problems but also conditions within the family are predictive of later delinquency in general, recidivism, or serious offenses. As a rule, composite indicators of risk factors outperformed single indicators. Data is presented on the early identification of chronic offenders. The results are critically examined in terms of error rates, and in terms of future directions for research

Risk and promotive effects in the explanation of persistent serious delinquency in boys

Risk and promotive effects were investigated as predictors of persistent serious delinquency in male participants of the Pittsburgh Youth Study (R. Loeber, D. P. Farrington, M. Stouthamer-Loeber, & W. B. van Kammen, 1998), living in different neighborhoods. Participants were studied over ages 13–19 years for the oldest sample and 7–13 years for the youngest sample. Risk and promotive effects were studied in 6 domains: child behavior, child attitudes, school and leisure activities, peer behaviors, family functioning, and demographics. Regression models improved when promotive effects were included with risk effects in predicting persistent serious delinquency. Disadvantaged neighborhoods, compared with better neighborhoods, had a higher prevalence of risk effects and a lower prevalence of promotive effects. However, predictive relations between risk and promotive effects and persistent serious delinquency were linear and similar across neighborhood socioeconomic status. Although advances have been made in the study of predictors of serious delinquency (Hawkins et al., 1998; Lipsey & Derzon, 1998), little is known about predictors of persistent serious offend-ing, which from a societal point of view is of particular concern. Most youth commit some delinquent acts in childhood or adoles