A comparison of path factors influencing depressive symptoms in children of immigrant women and Korean children in South Korea

The aim of this study is to compare Korean children and the children of immigrant women with respect to how depressive symptoms in these two groups are related to potential causes, including paternal neglect, maternal neglect, gender, socioeconomic status, ego resilience, peer relationships, teacher-student relationships, and discrimination. Concurrently analyzing multiple populations, we found that the path model and the path coefficients we used for the study were appropriate for both groups. Peer relationships and discrimination were found to have direct influences on depressive symptoms in both groups. We also found that gender, ego resilience, and teacher-student relationships had indirect effects in causing depressive symptoms in the children of immigrant women. Furthermore, maternal neglect had a more significant indirect effect among the children of immigrant women, whereas paternal neglect had a more significant indirect effect among the Korean children in our study. The results indicate that the same path model could be applied to both groups of children, allowing us to conclude that the same focus and approaches for intervention could be provided to both groups to decrease the levels of depressive symptoms.     

Fertility and son preference in Korea

In Korea, total fertility declined from 6.0 in 1960 to 1.6 in 1990, in spite of a strong preference for male offspring. This paper addresses the notion that son preference hinders fertility decline, and examines the effects of patriarchal relations and modernization on fertility using the 1991 Korea National Fertility and Family Health Survey. It was found that women who have a son are less likely to have another child, and that women with a son who do progress to have another child, take longer to conceive the subsequent child. This pattern prevailed for women of parity one, two, and three, and became more pronounced with higher parity. A multivariate analysis showed that preference for male offspring, patriarchy, and modernization are all strong predictors of second, third, and fourth conceptions.     

Cumulative cohort design for dose-finding

We introduce a new design for dose-finding in the context of toxicity studies for which it is assumed that toxicity increases with dose. The goal is to identify the maximum tolerated dose, which is taken to be the dose associated with a prespecified “target” toxicity rate. The decision to decrease, increase or repeat a dose for the next subject depends on how far an estimated toxicity rate at the current dose is from the target. The size of the window within which the current dose will be repeated is obtained based on the theory of Markov chains as applied to group up-and-down designs. But whereas the treatment allocation rule in Markovian group up-and-down designs is only based on information from the current cohort of subjects, the treatment allocation rule for the proposed design is based on the cumulative information at the current dose. We then consider an extension of this new design for clinical trials in which the subject's outcome is not known immediately. The new design is compared to the continual reassessment method.     

The Influence of Education and Training on Work Attitudes and the Moderating Effect of Supervisor Attitudes: Examining Chinese Employees

Human capital is a source of competitive advantage for organizations, in which education and training play important roles in the process of increasing the quality and quantity of human capital. Specifically, large-scale multinationals use systemized, structured methods to establish education and training systems. By studying the employees in a major food company in China, this paper is to investigate the influence of education and training on employees’ work attitudes and the moderating effect of supervisors’ attitudes. It is found that education and training have a positive influence on employees’ work attitudes. Among the training courses, the training of managerial ability has the most significant influence, followed by self-development courses. In addition, supervisors’ attitudes toward employees receiving managerial ability training, during and after the training, clearly have a positive moderating effect on employees’ overall work attitudes.     

Rule-Based Expert Systems and Linear Models: An Empirical Comparison of Learning-By-Examples Methods*

Building models of expert decision-making behavior from examples of experts’ decisions continues to receive considerable research attention. In the 1960's and 70's, linear models derived by statistical methods were studied extensively. More recently, rule-based expert systems derived by induction algorithms have been the focus of attention. Few studies compare the two approaches. This paper reports on a study that compared linear models derived by logistic regression with rule-based systems produced by two induction algorithms—ID3 and the genetic algorithm. The techniques performed comparably in modeling the experts at one task, graduate admissions, but differed significantly at a second task, bidder selection.     

Notes and Communications REPLANNING FREQUENCIES FOR MASTER PRODUCTION SCHEDULES

Updating production plans typically is achieved by rolling the planning horizon forward one period at a time, each time including the latest information in order to determine the best course of action to pursue in the present period. Theoretical planning-horizon studies have identified the conditions by which the production decisions in the current and some specified number of future periods remain optimal given some set of future demands. Motivated by these findings, this study addresses the replanning frequency in a hierarchical production planning problem where no planning-horizon theorems are available. In this problem the aggregate production plan and the master production schedule are linked by a rolling-horizon practice. Empirical experimentation indicates that under certain cost and demand conditions the master production schedule need not be updated every period. If a schedule does not need to be updated for several periods, the schedule for these periods can be frozen to provide stability for planning components at lower levels in the bill of material of the products. The results of this study thus provide some reference for the determination of the frozen portion of the master production schedule.