An efficient curve in stochastic capacity expansion

An optimum expansion of a single capacity is considered when the installation cost is very large and future demand is given by an evolving process of Wiener. Risk of expansion is evaluated and included in the decision criteria which links the capacity expansion problem with financial investment theory, Numerical results show the existence of an optimum expansion capacity and an efficient curve which represent the optimum choices with respect to the possible combinations of expansion cost and risk.     

Comparison of leadership styles in Confucian Asian countries

The purpose of this study was to examine the overall impact of four leadership styles (charismatic, directive, participative, and supportive) in four Confucian Asian countries, China, Japan, South Korea, and Singapore, by reviewing recent studies conducted in those countries. By reviewing 38 studies selected from 430 studies published between 2005 and 2016, we identify the impact of the four leadership styles in the four Asian countries. We start with the research question and purpose, and then propose criteria for selecting the relevant recent studies followed by a review of cultural heritage and its influence on leadership in the four Asian countries. We summarize and review the studies and, finally, discuss the theoretical and practical contributions of this study.     

EVERY DROP COUNTS: A WATER CONSERVATION EXPERIMENT WITH HOTEL GUESTS

We implement a field experiment with hotel guests to measure the effects of nonprice interventions on water conservation and customer satisfaction. In hotels, guests have no direct pecuniary incentive to conserve water, as consumers do at home, where they pay their own water bills. Because hotels earn greater profits when they manage to convince guests to conserve, guests may be suspicious of a hotel's stated social goal of water conservation. By implementing behavioral interventions that address these challenges, we find that our nudges can induce guests to reduce their water consumption, even when no direct monetary incentive is provided. Using post‐stay customer surveys, we detected no adverse effects on customer satisfaction due to these nudges. (JEL D12, I31, Q41, Q50)     

Bridge regression: Adaptivity and group selection

In high-dimensional regression problems regularization methods have been a popular choice to address variable selection and multicollinearity. In this paper we study bridge regression that adaptively selects the penalty order from data and produces flexible solutions in various settings. We implement bridge regression based on the local linear and quadratic approximations to circumvent the nonconvex optimization problem. Our numerical study shows that the proposed bridge estimators are a robust choice in various circumstances compared to other penalized regression methods such as the ridge, lasso, and elastic net. In addition, we propose group bridge estimators that select grouped variables and study their asymptotic properties when the number of covariates increases along with the sample size. These estimators are also applied to varying-coefficient models. Numerical examples show superior performances of the proposed group bridge estimators in comparisons with other existing methods.     

Accuracy and bias in self-perception of performance: Narcissism matters in Korea as well

Debates regarding the nature of self-enhancement versus accurate self-assessment have been active among psychologists for decades. More recently, researchers have become interested in the panculturality of self-enhancement. Some researchers argue that self-enhancement is universal and present within all cultures. Others declare self-enhancement to be a Western tendency, with self-diminishment being the norm among East Asians. Importantly, the majority of such studies have not compared self-perceptions against objective external criteria, especially those with East Asians. Furthermore, the link between narcissism and self-enhancement has been largely overlooked within Korean samples. To address such gaps, we utilized scores on an objective test as a criterion to investigate the accuracy of Koreans’ self-assessments of performance, as well as how individual differences in narcissism are related to such assessments. A sample of Korean students (N = 146; 71 women) completed self-report measures of narcissism and self-esteem, and took a listening comprehension quiz. Estimated and actual scores were collected and used to compute self-enhancement scores. Results demonstrated that Koreans’ self-perceptions of performance on the quiz were quite accurate. As has been found in Western cultures, narcissism was related to self-enhancement.     

Did PRWORA's mandatory school attendance policy increase attendance among targeted teenage girls?

The purpose of this paper was to examine if the school-attendance requirement of the Personal Responsibility and Work Opportunity Reconciliation Act (PRWORA) significantly increased attendance among the teenage girls that the policy targeted. This study applied difference-in-difference and difference-in-difference-in-difference methods to 12 years of cross-sectional data from the October Supplement of the Current Population Survey while isolating the effects of PRWORA from the effects of other factors that might have influenced the target population's school attendance. The findings indicated that PRWORA, overall, did not have significant positive impacts on school attendance; rather, the policy was associated with a small but significant reduction in school attendance of U.S.-born disadvantaged teenage girls between 1996 through 1999 and essentially no effects on the target population thereafter.     

Coffee intake,health-related quality of life,and associated factors of overactive bladder in older Korean women living in rural South Korea

ABSTRACT

Overactive bladder (OAB) is a common health problem in older women. The aim of the study was to investigate coffee consumption, health-related quality of life (HRQOL), and associated factors of OAB in older Korean women living in rural South Korea. A total of 248 women aged 65 years and older participated in this study. Chi-square tests, t-tests, and multivariable logistic regressions were performed. The means of coffee consumption between OAB and non-OAB groups were not significantly different. Women with OAB showed significantly lower HRQOL than women with stress urinary incontinence only. OAB was associated with high body mass index and poor health status.     

How to be Resilient? Local Philanthropy as a Collective Response to Natural Disasters

VOLUNTAS: International Journal of Voluntary and Nonprofit Organizations - When communities are struck by natural disasters, human service organizations play an important role in supplementing...     

Inhospitable workplaces? International students and paid work in food services

Most international students in Australia take up paid work during their studies, generally as part‐time employees in low‐wage, low‐skill labour markets. Though little is known about the detail of their work experiences, scattered reports suggest that wages and working conditions are often poor and pose significant issues of social justice. This article examines the characteristics of jobs held by one group of international students, drawing on in‐depth qualitative interviews that form part of a case study of Melbourne's café, restaurant and takeaway food services sector. The evidence indicates that precariousness in employment is widespread in this sector and that it centres on underpayment and non‐payment of wages, in breach of labour regulation. The article suggests that such illegal employer practices are facilitated by use of undeclared casual work. Underpayments are most severe in what are typically regarded as ethnic cafes and restaurants, which concentrate on employment of international students, but they are also widespread in mainstream cafes and restaurants, where international students share precarious work conditions with other workers. The findings underline the case for more concerted research and new policy initiatives.