LDPC码的树图法构造

LDPC码译码采用的是BP算法,但由于回路的存在,使译码重复迭代,特别是短长度的回路使LDPC码的性能下降.为此,用树图法分析了LDPC码的回路及其特性,给出了求解回路长度和所经过节点的方法,非常适合于计算机进行求解.同时也用树图的方法来构造LDPC码,可以在树生成的过程中了解其中的回路数目及长度.     

Effects of Concentrated Ownership and Owner Management on Small Business Debt Financing*

Using unique data and a new powerful Monte Carlo-based statistical tool, we examine the effects of concentrated ownership and owner–management (CO-OM) on the creditor–shareholder agency conflicts in small firms. A significant CO-OM effect from the small business owner's view, but insignificant from the commercial lenders' perspective, is found. Special features of informational asymmetry problems in small firms with CO-OM are also highlighted. Theoretical and empirical contributions are made to the small business management and corporate governance literature. Findings obtained from this research have important implications for small business practitioners as well as researchers, and this study can serve as a reference for policymakers and institutional lenders to assist small firms in successfully raising money through debt financing. In addition, a new powerful methodology is introduced to deal with various potential statistical biases and can be further applied to this line of research.     

Can Singapore maintain its competitive edge in manufacturing productivity vis-à-vis China and Malaysia?

This article investigates whether Singapore can maintain its competitive advantage in manufacturing from a labour productivity perspective vis-avis China and Malaysia, which are generally viewed as Singapore's competitors in manufacturing. We also investigate the extent to which China is closing the labour productivity gap with Singapore and Malaysia in technology-intensive segments of manufacturing. Our analysis reveals that China has the potential to develop a high labour-productivity and low-wage manufacturing sector. In terms of manufacturing labour productivity, China is moving towards convergence with Malaysia. Compared with Singapore, China's manufacturing labour productivity is still far behind, especially in key technology-intensive industries like electronics and chemicals, such that it is unlikely for China to catch up with Singapore within a decade.     

The impact of monetary policy on oil price persistence: An application of the smooth regime-switching model

This paper employs the smooth transition autoregressive model to evaluate the persistence of oil price changes, and chooses monetary policy variables as transition variables of the model to assess their roles in the persistence effects. The empirical results show that oil price changes displayed asymmetric adjustments within different regimes and were more sensitive to the movement of interest rates than inflation rate. In addition, high inflation rate would give rise to low oil price persistence, and expansionary monetary policy would bring about higher oil price persistence. Moreover, when the short- and long-term interest rates were over their threshold values, the persistence effects of oil price changes were opposite. In the present relatively low US interest rates, adopting either an inflation-targeting policy or/and a debt-financing policy to stimulate economic growth, the timing is appropriate and the effect will be positive and expected because of low persistence of oil price changes.     

An integrative model of customers' perceptions of health care services in Taiwan

As the health care service gets more competitive, health care practitioners and academic researchers are increasingly interested in exploring how patients perceive the quality and value of their care before building up their satisfaction levels and generating behavioural intentions. Drawing some theories from marketing and health care service literature, this study tries to propose an integrative model of customers' perceptions of health care services based on the established relationship among four key constructs (service quality, perceived value, satisfaction, and behavioural intentions). Structural equation modelling is then used to validate the model. As Taiwan's universal health insurance offers every citizen equal financial access to all health care providers, Taiwan offers a good opportunity to study how the patients' perception model is structured. The findings reveal both perceived quality and value as antecedent variables in this model illustrating direct and indirect paths from perceived quality and value to patient satisfaction and behavioural intentions.     

The elusive effect of bank size on profits

This study investigates the determinants of bank profit while paying particular attention to the influence of market share on profit, referred as the market share effect. The research seeks to answer the question whether the market share effect is conditional upon four country institutional factors including concentration ratio, bank regulations, the government's governance and country wealth, and is thus better in explaining the mixed results in the literature. This study employs comprehensive data of 44 countries from 1998 to 2004. The results show that market share positively influences profit when no country institutional factors are considered, but further strengthened in countries that are characterized by high concentration ratios, high restrictions on bank activities in insurance and real estate, good investor protection and a strong rule of law.     

Customer Participation and Project Performance: The Mediating Role of Knowledge Sharing in the Chinese Telecommunication Service Industry

Purpose: Extant literature has devoted more attention to customer value co-creation and knowledge sharing, not only in business-to-customer (B2C) markets, but also in business-to-business (B2B) markets. This study explores and examines the antecedents and consequences of customer knowledge sharing in the context of B2B markets by applying the motivation-opportunity-ability (MOA) framework.

Methodology/Approach: This empirical study involves two structured surveys of project managers from both suppliers (n = 213) and customers (n = 312), which were conducted in the context of the Chinese telecommunication service industry. The conceptual model of this study was subsequently tested by developing Partial Least Squares (PLS) based structural equation models.

Findings: It was found that customer knowledge sharing is facilitated by four MOA factors: customer orientation, customer perceived benefits, customer socialization, and customer technological capability. It was determined that knowledge sharing has a direct and significant effect on project performance. Furthermore, the study revealed that such relationships vary across suppliers and customers.

Research Implications: This study extends the existing research stream of interfirm knowledge sharing by examining the antecedents and consequences of customer knowledge sharing from dual perspectives of customers and suppliers, and sheds light on the benefits of customer knowledge sharing. The dyadic perspective embodied in this design facilitates our understanding and management of knowledge sharing between organizations.

Originality/Value/Contribution: This article provides an important contribution to the existing literature of customer knowledge sharing by revealing how to effectively facilitate interorganizational knowledge sharing, particularly knowledge from customers to suppliers, and discovers conditions under which customers are more likely to exchange information, and share knowledge with their suppliers from the dyadic perspective.     

Transforming visitors into members in online brand communities: Evidence from China

Using observational learning theory, this study investigates how simply viewing posts can affect visitors' intentions to join an online brand community. The study finds that the viewing of posts leads to informational value and perceived social value, which in turn increases visitors' intentions to participate in the community. For visitors with brand ownership, both informational value and perceived social value play full mediating roles; for visitors without brand ownership, both values play partial mediating roles. In addition, for visitors with brand ownership, informational value is just as important as perceived social value in shaping their participation intentions; for those without brand ownership, perceived social value is more important than informational value. The findings enrich the brand community literature and provide implications for brand community development.     

Firm performance,corporate ownership,and corporate social responsibility disclosure in China

The existing literature provides conflicting results on the association between firm performance and corporate social responsibility (CSR) disclosure. This paper empirically examines the effect of firm performance on CSR disclosure in terms of disclosure frequency and quality among Chinese listed firms and the possible mediating effect of corporate ownership on the relationship between firm performance and CSR disclosure. Our findings show that better‐performing firms are more likely than worse‐performing ones to disclose CSR information and to produce higher quality CSR reports. In addition, the link between firm performance and CSR disclosure is found to be weaker among state‐owned enterprises compared with non‐state‐owned ones.     

Portfolio characteristics of outward foreign direct investment and dynamic performance of emerging economy firms: An option portfolio perspective

In recent decades, emerging economy (EE) firms have taken an aggressive approach to international expansion. Drawing upon option portfolio theory, this study develops the characteristics of the OFDI portfolio based on two attributes of a portfolio and two dimensions of host environments. We examine how the characteristics of the OFDI portfolio dynamically influence the OFDI?performance linkage. Using a sample of 545 Chinese listed multinational firms during the period 2009–2018, we find EE firms’ OFDI contributes more to short-term performance when the OFDI portfolio features a higher overall quality of host institutions or a higher diversity of strategic factor market developments in the host countries. However, over a relatively long period, EE firms’ OFDI contributes more to long-term performance when the portfolio features a higher overall diversity of strategic factor markets and institutional environments. These findings offer further knowledge on the OFDI?performance link in emerging economies.