This study empirically explored the antecedents of organizational citizenship behavior(OCB) from a social exchange perspective among employees in high-tech organizations.

After the reform and opening to the outside world,the development of market and the systematic transformation of country system bring rapid changes in the socialstructure in the countryside,which results in the changes of social exchange ways in the traditional society.

The author made analysis in the results from both macroeconomic and microeconomic aspects,and make theoretical explanations on Land-for-security policy with the theory of social exchange.

Study of the Index System for Assessing Asynchronous Social Interaction Quality in E-learning;

The Research of Social Interaction in Virtual Learning Community from the Perspective of Sociology

This paper preliminarily analyzes the theoretical base of social interaction and its significance,and then proposes several tools to realize social interaction and discusses factors influencing its quality,thus advises ways to guarantee the quality.