Optimal antitrust enforcement: information cost and deterrent effect

This study analyzes the optimal antitrust enforcement rule and, in doing so, presents a model that illuminates two important issues. First, it compares the per se legal and illegal judicial standards to the rule of reason judicial standard in terms of information costs and general social welfare. Second, it seeks to derive the optimal judicial standard that minimizes the problems of under- and over-deterrence. These two issues are closely related because the benefit of additional information can only be measured by its deterrent effects. In this respect, this work synthesizes economic models from decision theory and the public enforcement of law. Lastly, in addition to discussing the optimal information level, we derive the optimal permissiveness of the judicial standard, the optimal burden of proof, and the optimal punishment level. We also analyze how these policy variables are interrelated.     

Y-chromosome STR haplotype profiling in the Korean population

Allele and haplotype frequencies of seven Y-chromosome STR loci were determined from a sample of 330 unrelated males in the Korean population.     

Determination of sex for the 12th thoracic vertebra by morphometry of three-dimensional reconstructed vertebral models

Thirty-three linear measurements and two ratios were derived from 102 12th thoracic vertebrae of the Digital Korean database at the Catholic Institute for Applied Anatomy. Of 35 linear traits, 23 were sexually dimorphic. We created 23 discriminant function equations that predicted sex with 62.7-85.3% accuracy. The analysis using combinations of two factors gave higher accuracies: most equations with accuracies over 80% included at least one measurement involving the coronal diameter of the vertebral endplate. Using stepwise method of discriminant function analysis, three variables predicted sex with 90.0% accuracy: the coronal diameter of the superior endplate of the vertebral body, the ratio of anterior to middle height of the body, and the length of the left mammillary process and pedicle. Coronal dimensions of the vertebral body represented the major sex difference. These equations will help forensic discrimination of the sex of this vertebra among Koreans.     

"Connecting" and "Disconnecting" With Civic Life: Patterns of Internet Use and the Production of Social Capital

This article explores the relationship between Internet use and the individual-level production of social capital. To do so, the authors adopt a motivational perspective to distinguish among types of Internet use when examining the factors predicting civic engagement, interpersonal trust, and life contentment. The predictive power of new media use is then analyzed relative to key demographic, contextual, and traditional media use variables using the 1999 DDB Life Style Study. Although the size of associations is generally small, the data suggest that informational uses of the Internet are positively related to individual differences in the production of social capital, whereas social-recreational uses are negatively related to these civic indicators. Analyses within subsamples defined by generational age breaks further suggest that social capital production is related to Internet use among Generation X, while it is tied to television use among Baby Boomers and newspaper use among members of the Civic Generation. The possibility of life cycle and cohort effects is discussed.     

Merger settlement as a screening device

This article presents an economic model of judicial settlement in an asymmetric information setting to analyze the merger settlement between merging firms and a competition authority. The model analyzes how the competition authority may use the settlement process to screen out efficient mergers from inefficient ones. Because of the self-selection among merging firms, efficient mergers may be litigated in court, whereas inefficient mergers may be settled before going to trial. We further analyze the role and the effect of the second request in a merger settlement.     

Investigating the effects of peer association and parental influence on adolescent substance use: A study of adolescents in South Korea

The central purpose of this study was to examine whether peer influence has a greater impact on adolescent substance use than parental influence. This was a comparative study that examined cross-cultural applicability by applying the established findings and theoretical suggestions, such as social learning theory and social bonding theory in the United States, to a traditionally non-Western social context (South Korea). Although the theories have firmly established their explicability on adolescent delinquency and substance use in U.S. society, there are relatively few empirical studies to establish its generalizability in societies outside the U.S. and even fewer in such traditionally non-Western societies as South Korea. Using a nationwide sample of self-reported data from 3,188 junior high school students, estimations from multivariate analyses were used to compare the relative importance of peer and parental influence on adolescent substance (alcohol and tobacco) use. The findings from the current study supported both social learning theory and social bonding theory, suggesting that both peer and parental influence are significant in predicting the risks of adolescent substance use. Although parental influence was slightly greater than peer factors, the difference was negligible. The limitations, the unique social context of Korean society, and future research implications are then discussed.     

Korean population genetic data for eleven STR loci.

Allele frequency and forensic parameters for eleven STR loci were surveyed in a random sample from the Korean population.