Research collaboration model in academic social networks

ABSTRACT

This paper proposes a hybrid collaboration recommendation method that accounts for research similarities and the previous research cooperation network. Research cooperation is measured by combining the collaboration time and the number of co-authors who already collaborated with at least one scientist. Research similarity is based on authors’ previous publications and academic events they attended. A weighted directed graph is built to discover new collaborators by using direct and indirect connections between scientists. Moreover, a consensus-based system is built to integrate bibliography data from different sources. The experimental results show that our method improves the recommendation performances over other methods.     

Wage Differentials among Ownership Groups and Worker Quality in Vietnamese Manufacturing

Wholly foreign multinational enterprises (WFs), joint-venture multinationals (JVs), state-owned enterprises (SOEs) pay higher wages than domestic private firms in Vietnamese manufacturing. In large samples of medium–large (20+ employees) firms, conditional differentials accounting for worker education and occupation, as well as capital intensity, size, and shares of female workers, were substantially smaller, but positive and significant. Wage levels and differentials varied substantially among industries. Conditional differentials remained positive and significant for WFs and JVs in most of the 11 industries examined, but estimates of SOE-private differentials were insignificant in most industries. Robustness checks using 2007 data yielded similar results.     

Anticipating independence,no premonition of partition. The lessons of bank branch expansion on the Indian subcontinent, 1939 to 1946

We examine investment in bank branches on the Indian subcontinent in 1939 and 1946. In 1947, the states of India and Pakistan were created from the erstwhile colony of British India. Partition was destabilizing to both economies. We use branch expansion as a proxy for entrepreneur's pre‐partition predictions of the future of these regions. Our results indicate there were no premonitions of economic dislocation. Banks tended to deepen their presence in regions which were already developed. But controlling for the level of 1931 development, branch placement was highest in exactly those regions, Bengal and the Punjab, which were to experience the greatest negative consequences from political division. After 1947, multiple banks failed; most failing banks were registered in the Punjab or Bengal region. In United India, businessmen saw as much promise in regions which were to become Pakistan as in regions which were to become India. After partition, the Pakistan regions were immediately more economically fragile. This event provides a general lesson. Economic integration had intensified over the years of British rule. The abrupt stop to integration harmed especially the smaller, less diversified region. Politicians should be wary of politically dividing regions which have evolved to function as integrated economic units.     

Effects of investor tax heterogeneity on stock prices and trading behaviour around the ex-dividend day: the case of Australia

Using a sample of Australian stocks during the 1996–2014 period, this study examines how tax heterogeneity between domestic and foreign investors affects trading behaviour and stock prices around the ex-dividend day. Domestic investors prefer dividends and tend to buy stocks cum-dividend and sell them ex-dividend whereas foreign investors tend to trade in the opposite direction. Abnormal trading turnover increases with tax heterogeneity. Moreover, stocks with a larger domestic investor base are associated with a higher price drop-off ratio on the ex-dividend day and higher market value of franking credits. Overall, our findings support the dynamic dividend clientele hypothesis.     

Institutional ownership,cross-shareholdings and corporate cash reserves in Japan

Cross-country studies document a negative relation between corporate governance and cash holdings. In contrast, this relation is found to be positive in the United States. In this paper, we examine the case of Japanese firms. Using institutional ownership and cross-shareholdings as the main governance variables, we show that better governance is associated with higher cash balances as in the United States. The reason is that better-governed firms make better investment decisions. Their investments are not driven by excess liquidity and result in higher profitability and higher firm valuation. Overall, our findings indicate that management profligacy is a bigger concern to shareholders than management propensity to hoard cash because of risk aversion.     

Characterization of Normal Distribution Related to Two Samples Based on Regression

Characterization of normal distribution related to two samples based on second conditional moments has been obtained. This characterization has been transformed to a characterization based on the UMVU estimators of the density function. These results are generalized to k samples from normal distributions. Finally applications of these characterization results to goodness-of-fit test are discussed.     

Investigation of factors affecting the diffusion of mobile telephone services: An empirical analysis for Vietnam

This paper analyzes the diffusion of mobile telecommunications services in Vietnam and examines how telecommunications regulation and potential substitute/complement services affect the growth of the number of mobile telephone subscribers. Using a logistic diffusion model, it is found that fixed telephone services are a complement while data services have a negative relation to mobile telephone services in Vietnam. As for regulation, the policy of introducing competition has been found to be the most effective in influencing the adoption of mobile services. Another important result is that the estimated potential market is roughly 76% of the total population. The findings suggest that suitable regulation that guarantees competition in the mobile telecommunications market in a developing country such as Vietnam is one of the most important factors for a positive diffusion process.     

Affluent mature consumers: Preference and patronisation for financial services

Mature consumers have long been recognised as an important segment of market that no marketers of financial-service providers could ignore. The segment itself, however, is not homogeneous. Our study further segments the market basing on income and contrasts the differences between upscale mature consumers and lower scale ones in terms of their preference and patronisation for financial services. The study based on two large-scale studies designed to generate information that would fill gaps in our existing knowledge about upscale older consumers. Implications are discussed for marketers of financial services to fine-tune their differentiation strategies.     

STRUCTURE AND PERFORMANCE OF THE UK FOOD AND DRINK INDUSTRIES

This paper analyses the structural characteristics of the food and drink industries and assesses their recent economic performance. Although classified among the less technologically intensive group of British manufacturing industries, the food and drink industries are found to share many of the features of the more technologically intensive group, such as product differentiation, product diversification and advertising intensity. They are also found to have achieved above-average growth in labour and total factor productivity through expansion in size, capital accumulation and shedding of labour.