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Li W.,Macao Polytechnic Institute
Information Sciences | Year: 2013

The detection of network communities has attracted significant research attention lately. To discover such structures, a mathematical measure known as modularity is often used for optimization. Unfortunately, the optimization is NP-hard, and approximated solutions have to be sought for large networks. In this paper, we propose a nonlinear programming method for optimization that is based on the augmented Lagrangian technique. We further identify the inherent connection between the proposed method and positive semi-definite programming and its low-rank reduction, which helps to justify the performance of the method. Compared with previously published approaches, the proposed method is empirically efficient and effective at detecting underlying network communities. © 2012 Elsevier Inc. All rights reserved. Source


Sheng L.,Macao Polytechnic Institute
Global Policy | Year: 2014

This survey article develops a stochastic framework to analyze capital inflows and outflows and to illustrate how a developing economy can determine its level of capital account openness and simultaneously balance concerns regarding economic growth and volatility. We find that rapid economic growth inevitably causes fluctuations in a financially immature economy that has a high level of capital account openness. We identify a conflict of interest between capital-rich and capital-importing economies when capital account liberalization is promoted by the former. © 2013 University of Durham and John Wiley & Sons, Ltd. Source


Lau Y.,Macao Polytechnic Institute
Maternal and Child Health Journal | Year: 2010

This study set out to (1) estimate the prevalence of three forms of feeding intention among 2,178 pregnant women in six of Hong Kong's regional hospitals and (2) identify the associated demographic, socioeconomic, obstetric and relational correlates. The research design was exploratory, cross-sectional, and quantitative. The Chinese version of a self-administered questionnaire was used to collect the demographic, socio-economic, and obstetric characteristics of the women. Couples' relationships were investigated using the Dyadic Adjustment Scale. All women in the second trimester of their pregnancies who attended the target antenatal clinics within the data collection period of December 2004 to December 2006 were recruited. The prevalence rates of breastfeeding, mixed feeding and artificial feeding were 53.9%, 14.8%, and 31.3%, respectively. Women who had been born in Hong Kong, lived in accommodation that was ≥300 feet2 (∼30 m2), had made an early antenatal booking, had a planned pregnancy, were experiencing their first pregnancy, and had a lower level of conflict with their partners were significantly more likely to opt for breastfeeding. Women who had been born in Hong Kong and already had children were significantly more likely to choose mixed feeding, compared with the artificial group in a multinomial logistic regression model. These findings suggest that effective promotion of breastfeeding during the prenatal period must target the correlates of feeding intention. © 2009 Springer Science+Business Media, LLC. Source


Sheng L.,Macao Polytechnic Institute
Global Policy | Year: 2014

This paper illustrates the effects of two major macroeconomic factors on global imbalances with regard to China as a growing giant in the global economy. The country has observed a continuous drop in the labor income share of GDP and a considerable rise in income inequality, giving rise to a savings glut and high investment rates. China's inflation, housing bubble, and capital losses in foreign markets are attributable to its rushed transition to market-based financing and its inherent vulnerability to international capital flows. The US is also experiencing a rise in inequality, although this rise is associated with a decline in savings as a fundamental cause of its current account deficit, whereas its exorbitant privilege from the dollar's reserve currency status is accompanied by increasing difficulties posed by the Triffin dilemma. It is shown that global imbalances may be less related to misaligned exchange rates than to distorted wage differences. © 2014 University of Durham and John Wiley & Sons, Ltd. Source


Wong A.K.Y.,Macao Polytechnic Institute
IEEE Internet Computing | Year: 2010

The mobile Internet and location-enabled mobile devices have become increasingly popular, inspiring a new type of communication network. This near-me area network (NAN) focuses on communication among wireless devices in close proximity, creating a new kind of application domain. This article introduces NAN and reviews existing applications and challenges. © 2010 IEEE. Source

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