mr. ning xiangdong, born in may 1965, chinese nationality, no long-term residence permit of foreign countries, doctor of quantitative economics, school of economics and management, tsinghua university; professor and doctoral supervisor of school of economics and management, tsinghua university. he once worked as independent director of goertek inc.; independent director of datang telecom technology co., ltd; independent director of hongyuan securities co., ltd; independent director of shantui construction machinery co., ltd; independent director of china aerospace science and technology corporation; independent non-executive director of china southern airlines co., ltd; independent director of sichuan changhong electric co.,ltd; independent director of yango group co., ltd; independent non-executive director of weichai power co., ltd. mr. ning is now independent non-executive director of our company; independent non-executive director of appotronics corporation ltd.