Are Networks Flat or Vertical?: Developing a Multi-Level Multi-Dimension Network Model

Extant public administration network literature tend to conceptualize and measure relationships in networks based on the premise that the nodes and ties in networks lie on a single-level horizontal structure. The purpose of the current study is to suggest that networks are inevitably multi-level and multi-dimension structures and propose a multi-level multi-dimension network model (MLMD). More specifically, network relationships such as within-level, inter-level, and inter-sector are offered to depict the multi-layered and multi-sectoral nature of the network relationships among the government and non-government actors. For empirical analysis, the current study constructs a hypothetical network to describe MLMD.     

Gay Seouls: Expanding Religious Spaces for Non-Heterosexuals in South Korea

What Protestant congregations offer spaces for worship and dialogue among persons with different sexual orientations? The academic literature finds or assumes that non-heterosexuals are stigmatized or invisible in theologically conservative congregations and are welcomed in progressive, affirming congregations. This article develops an alternative claim that some conservative or evangelical congregations offer attractive spaces for non-heterosexuals to worship and dialogue. We illustrate with an exploratory study of four congregations in South Korea—two theologically progressive, two evangelical—whose pastors welcomed everybody regardless of sexual orientation or gender identity. The “inclusive-evangelical” congregations retained conservative theology on sexuality (sexual relations only within heterosexual marriage) but offered more empathic dialogue with non-heterosexuals than did most evangelical congregations; they also provided more resources, conventional religious culture, and ties to traditional affective networks than the affirming-progressive congregations. Inclusive-evangelical congregations offer an institutional venue for non-heterosexual Christians in Korea to potentially reconcile three central values: conservative Christianity, traditional (Confucian) affective networks, and expressive individualism.     

Demographic Change and Fiscal Sustainability in Asia

Changes in the population age structure can have significant effects on fiscal sustainability since they can affect both government revenue and expenditure. In this paper, we project government revenue, expenditure, and fiscal balance in developing Asia up to 2050 using a simple stylized model and the National Transfer Accounts data set. Rapidly aging countries are likely to suffer a tangible deterioration of fiscal sustainability under their current tax and expenditure system. On the other hand, rapid economic growth can improve fiscal health in poorer, relatively young countries with still-growing working-age populations. Overall, our results indicate that Asia’s population aging will adversely affect its fiscal sustainability, pointing to a need for Asian countries to further examine the impact of demographic shifts on their fiscal health.     

Is Food Insecurity Associated with Depressive Symptoms in South Korea?

Emerging studies have suggested a possible link between food hardship and depression; however, empirical knowledge is limited. In South Korea, more public discussion has been conducted regarding the prevalence and consequences of food insecurity on mental health. To begin to address the knowledge gap, we applied family stress theory and investigated the association of food insecurity with depression in South Korea. We employed observational data from the Korea Welfare Panel Study, the first data to draw on food insecurity information from a nationally representative sample in Korea. Our sample consisted of 744 non‐elderly household heads. The independent variable “food insecurity” was measured using a six‐item scale adapted from the United States Department of Agriculture Food Security Scale. The dependent variable “depression” was measured using 11 questions from the Center for Epidemiologic Studies Depression Scale adapted for Koreans. After controlling for income, material hardship, and other factors, our ordinary least squares regression findings show that food insecurity significantly predicts depression. Our findings are consistent whether food insecurity is measured on a continuum or in categorical groups. More research and empirical evidence should be shared to provide legitimate grounds for policy interventions that address and prevent food insecurity and mental health issues.     

Residential segregation in metropolitan established immigrant gateways and new destinations, 1990-2000

In the 1990s, many immigrants bypassed established gateways like Los Angeles, New York, Chicago, and Miami to create new immigrant destinations across the US. In this paper, we examine how segregation and spatial assimilation might differ between established gateways and new destinations among the 150 largest metropolitan areas. Using data from the 1990 and 2000 censuses, we calculate levels of dissimilarity for Hispanics and Asians by nativity for these two gateway types. Our findings show that segregation levels are consistently lower in new destinations. However, Hispanics in new destinations experienced significant increases segregation during the 1990s, suggesting a convergence in residential patterns by destination type. Nevertheless, in both destinations the native-born are less segregated than the foreign born—consistent with immigrant spatial incorporation. Finally, socioeconomic indicators are generally consistent with predictions of spatial assimilation.     

Three Ways to Be Happy: Pleasure,Engagement, and Meaning—Findings from Australian and US Samples

This study examined the contributions of orientations to happiness (pleasure, engagement and meaning) to subjective well-being. A sample of 12,622 adults from the United States completed on-line surveys measuring orientations to happiness, positive affect, negative affect, and life satisfaction. A sample of 332 adults from Australia also completed these surveys as well as a measure of the big five factor personality traits. Hierarchical regressions generally supported the hypothesis that the three orientations to happiness predict subjective well-being (satisfaction with life, positive affect and negative affect) beyond sociodemographic variables and personality. Meaning and engagement explained the greatest variance in all three components of subjective well-being. Overall, these findings support the importance of a eudaimonic approach in addition to the hedonic approach to achieving happiness. Moreover, findings were relatively consistent in both the Australian and US samples. Some of these data were presented at the 8th Australian Centre on Quality of Life Conference, Melbourne, Australia.     

Measures of association for nominal categorical variables

This paper reviews existing measures of association for nominal categorical variables, and presents some alternative measures of association, which are symmetric and flexible enough to find partial and multiple association.     

Analytical binomial lookback options with double-exponential jumps

We study the problem of the convergence of the adjusted binomial lookback option in double-exponential jump diffusion models. By using the results of [Dai, M., (2000). A modified binomial tree method for currency lookback options. Acta Mathematica Sinica, 16, 445–454; Kou, S., & Wang, H. (2004). Option pricing under a double exponential jump diffusion model. Management Science, 50, 1178–1192] and [Park, H.S., Kim, K.I., & Qian, X. (2009). A Mathematical modeling for the Lookback option with jump diffusion using Binomial tree method. Journal of Computational and Applied Mathematics, preprint], we show the equivalence between the adjusted binomial tree method and the explicit difference scheme. The convergence is also theoretically proved through the notion of viscosity solution. Numerical results coincide with the theoretical results.     

Convergence rates of generalization errors for margin-based classification

This paper develops a general approach to quantifying the size of generalization errors for margin-based classification. A trade-off between geometric margins and training errors is exhibited along with the complexity of a binary classification problem. Consequently, this results in dealing with learning theory in a broader framework, in particular, of handling both convex and non-convex margin classifiers, among which includes, support vector machines, kernel logistic regression, and ψ$\psi$-learning. Examples for both linear and nonlinear classifications are provided.     

The Role of Migration and Single Motherhood in Upper Secondary Education in Mexico

We investigated the link between migration, family structure, and the risk of dropping out of upper secondary school in Mexico. Using two waves of the Mexican Family Life Survey, which includes 1,080 upper secondary students, we longitudinally modeled the role of family structure in the subsequent risk of dropping out, focusing on the role of migration in single motherhood. We found that children living without a father because of international migration or divorce or separation are at a greater risk relative to children in 2‐parent households. Economic characteristics of the household provide a partial explanation for children living in single‐mother households because of divorce or separation but do not explain the greater risk of dropping out for children with fathers in the United States.